--- /dev/null
- .splice_read = cifs_splice_read,
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2008
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ * Common Internet FileSystem (CIFS) client
+ *
+ */
+
+/* Note that BB means BUGBUG (ie something to fix eventually) */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/filelock.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/seq_file.h>
+#include <linux/vfs.h>
+#include <linux/mempool.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/namei.h>
+#include <linux/random.h>
+#include <linux/uuid.h>
+#include <linux/xattr.h>
+#include <uapi/linux/magic.h>
+#include <net/ipv6.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#define DECLARE_GLOBALS_HERE
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include <linux/mm.h>
+#include <linux/key-type.h>
+#include "cifs_spnego.h"
+#include "fscache.h"
+#ifdef CONFIG_CIFS_DFS_UPCALL
+#include "dfs_cache.h"
+#endif
+#ifdef CONFIG_CIFS_SWN_UPCALL
+#include "netlink.h"
+#endif
+#include "fs_context.h"
+#include "cached_dir.h"
+
+/*
+ * DOS dates from 1980/1/1 through 2107/12/31
+ * Protocol specifications indicate the range should be to 119, which
+ * limits maximum year to 2099. But this range has not been checked.
+ */
+#define SMB_DATE_MAX (127<<9 | 12<<5 | 31)
+#define SMB_DATE_MIN (0<<9 | 1<<5 | 1)
+#define SMB_TIME_MAX (23<<11 | 59<<5 | 29)
+
+int cifsFYI = 0;
+bool traceSMB;
+bool enable_oplocks = true;
+bool linuxExtEnabled = true;
+bool lookupCacheEnabled = true;
+bool disable_legacy_dialects; /* false by default */
+bool enable_gcm_256 = true;
+bool require_gcm_256; /* false by default */
+bool enable_negotiate_signing; /* false by default */
+unsigned int global_secflags = CIFSSEC_DEF;
+/* unsigned int ntlmv2_support = 0; */
+unsigned int sign_CIFS_PDUs = 1;
+
+/*
+ * Global transaction id (XID) information
+ */
+unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */
+unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
+unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */
+spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */
+
+/*
+ * Global counters, updated atomically
+ */
+atomic_t sesInfoAllocCount;
+atomic_t tconInfoAllocCount;
+atomic_t tcpSesNextId;
+atomic_t tcpSesAllocCount;
+atomic_t tcpSesReconnectCount;
+atomic_t tconInfoReconnectCount;
+
+atomic_t mid_count;
+atomic_t buf_alloc_count;
+atomic_t small_buf_alloc_count;
+#ifdef CONFIG_CIFS_STATS2
+atomic_t total_buf_alloc_count;
+atomic_t total_small_buf_alloc_count;
+#endif/* STATS2 */
+struct list_head cifs_tcp_ses_list;
+spinlock_t cifs_tcp_ses_lock;
+static const struct super_operations cifs_super_ops;
+unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
+module_param(CIFSMaxBufSize, uint, 0444);
+MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
+ "for CIFS requests. "
+ "Default: 16384 Range: 8192 to 130048");
+unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
+module_param(cifs_min_rcv, uint, 0444);
+MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
+ "1 to 64");
+unsigned int cifs_min_small = 30;
+module_param(cifs_min_small, uint, 0444);
+MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
+ "Range: 2 to 256");
+unsigned int cifs_max_pending = CIFS_MAX_REQ;
+module_param(cifs_max_pending, uint, 0444);
+MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
+ "CIFS/SMB1 dialect (N/A for SMB3) "
+ "Default: 32767 Range: 2 to 32767.");
+#ifdef CONFIG_CIFS_STATS2
+unsigned int slow_rsp_threshold = 1;
+module_param(slow_rsp_threshold, uint, 0644);
+MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
+ "before logging that a response is delayed. "
+ "Default: 1 (if set to 0 disables msg).");
+#endif /* STATS2 */
+
+module_param(enable_oplocks, bool, 0644);
+MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
+
+module_param(enable_gcm_256, bool, 0644);
+MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0");
+
+module_param(require_gcm_256, bool, 0644);
+MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0");
+
+module_param(enable_negotiate_signing, bool, 0644);
+MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. Default: n/N/0");
+
+module_param(disable_legacy_dialects, bool, 0644);
+MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
+ "helpful to restrict the ability to "
+ "override the default dialects (SMB2.1, "
+ "SMB3 and SMB3.02) on mount with old "
+ "dialects (CIFS/SMB1 and SMB2) since "
+ "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
+ " and less secure. Default: n/N/0");
+
+extern mempool_t *cifs_sm_req_poolp;
+extern mempool_t *cifs_req_poolp;
+extern mempool_t *cifs_mid_poolp;
+
+struct workqueue_struct *cifsiod_wq;
+struct workqueue_struct *decrypt_wq;
+struct workqueue_struct *fileinfo_put_wq;
+struct workqueue_struct *cifsoplockd_wq;
+struct workqueue_struct *deferredclose_wq;
+__u32 cifs_lock_secret;
+
+/*
+ * Bumps refcount for cifs super block.
+ * Note that it should be only called if a referece to VFS super block is
+ * already held, e.g. in open-type syscalls context. Otherwise it can race with
+ * atomic_dec_and_test in deactivate_locked_super.
+ */
+void
+cifs_sb_active(struct super_block *sb)
+{
+ struct cifs_sb_info *server = CIFS_SB(sb);
+
+ if (atomic_inc_return(&server->active) == 1)
+ atomic_inc(&sb->s_active);
+}
+
+void
+cifs_sb_deactive(struct super_block *sb)
+{
+ struct cifs_sb_info *server = CIFS_SB(sb);
+
+ if (atomic_dec_and_test(&server->active))
+ deactivate_super(sb);
+}
+
+static int
+cifs_read_super(struct super_block *sb)
+{
+ struct inode *inode;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct timespec64 ts;
+ int rc = 0;
+
+ cifs_sb = CIFS_SB(sb);
+ tcon = cifs_sb_master_tcon(cifs_sb);
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
+ sb->s_flags |= SB_POSIXACL;
+
+ if (tcon->snapshot_time)
+ sb->s_flags |= SB_RDONLY;
+
+ if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ else
+ sb->s_maxbytes = MAX_NON_LFS;
+
+ /*
+ * Some very old servers like DOS and OS/2 used 2 second granularity
+ * (while all current servers use 100ns granularity - see MS-DTYP)
+ * but 1 second is the maximum allowed granularity for the VFS
+ * so for old servers set time granularity to 1 second while for
+ * everything else (current servers) set it to 100ns.
+ */
+ if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) &&
+ ((tcon->ses->capabilities &
+ tcon->ses->server->vals->cap_nt_find) == 0) &&
+ !tcon->unix_ext) {
+ sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */
+ ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0);
+ sb->s_time_min = ts.tv_sec;
+ ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX),
+ cpu_to_le16(SMB_TIME_MAX), 0);
+ sb->s_time_max = ts.tv_sec;
+ } else {
+ /*
+ * Almost every server, including all SMB2+, uses DCE TIME
+ * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC
+ */
+ sb->s_time_gran = 100;
+ ts = cifs_NTtimeToUnix(0);
+ sb->s_time_min = ts.tv_sec;
+ ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX));
+ sb->s_time_max = ts.tv_sec;
+ }
+
+ sb->s_magic = CIFS_SUPER_MAGIC;
+ sb->s_op = &cifs_super_ops;
+ sb->s_xattr = cifs_xattr_handlers;
+ rc = super_setup_bdi(sb);
+ if (rc)
+ goto out_no_root;
+ /* tune readahead according to rsize if readahead size not set on mount */
+ if (cifs_sb->ctx->rsize == 0)
+ cifs_sb->ctx->rsize =
+ tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx);
+ if (cifs_sb->ctx->rasize)
+ sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE;
+ else
+ sb->s_bdi->ra_pages = 2 * (cifs_sb->ctx->rsize / PAGE_SIZE);
+
+ sb->s_blocksize = CIFS_MAX_MSGSIZE;
+ sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
+ inode = cifs_root_iget(sb);
+
+ if (IS_ERR(inode)) {
+ rc = PTR_ERR(inode);
+ goto out_no_root;
+ }
+
+ if (tcon->nocase)
+ sb->s_d_op = &cifs_ci_dentry_ops;
+ else
+ sb->s_d_op = &cifs_dentry_ops;
+
+ sb->s_root = d_make_root(inode);
+ if (!sb->s_root) {
+ rc = -ENOMEM;
+ goto out_no_root;
+ }
+
+#ifdef CONFIG_CIFS_NFSD_EXPORT
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
+ cifs_dbg(FYI, "export ops supported\n");
+ sb->s_export_op = &cifs_export_ops;
+ }
+#endif /* CONFIG_CIFS_NFSD_EXPORT */
+
+ return 0;
+
+out_no_root:
+ cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
+ return rc;
+}
+
+static void cifs_kill_sb(struct super_block *sb)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+ /*
+ * We ned to release all dentries for the cached directories
+ * before we kill the sb.
+ */
+ if (cifs_sb->root) {
+ close_all_cached_dirs(cifs_sb);
+
+ /* finally release root dentry */
+ dput(cifs_sb->root);
+ cifs_sb->root = NULL;
+ }
+
+ kill_anon_super(sb);
+ cifs_umount(cifs_sb);
+}
+
+static int
+cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ unsigned int xid;
+ int rc = 0;
+
+ xid = get_xid();
+
+ if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
+ buf->f_namelen =
+ le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
+ else
+ buf->f_namelen = PATH_MAX;
+
+ buf->f_fsid.val[0] = tcon->vol_serial_number;
+ /* are using part of create time for more randomness, see man statfs */
+ buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
+
+ buf->f_files = 0; /* undefined */
+ buf->f_ffree = 0; /* unlimited */
+
+ if (server->ops->queryfs)
+ rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
+
+ free_xid(xid);
+ return rc;
+}
+
+static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ struct TCP_Server_Info *server = tcon->ses->server;
+
+ if (server->ops->fallocate)
+ return server->ops->fallocate(file, tcon, mode, off, len);
+
+ return -EOPNOTSUPP;
+}
+
+static int cifs_permission(struct mnt_idmap *idmap,
+ struct inode *inode, int mask)
+{
+ struct cifs_sb_info *cifs_sb;
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
+ if ((mask & MAY_EXEC) && !execute_ok(inode))
+ return -EACCES;
+ else
+ return 0;
+ } else /* file mode might have been restricted at mount time
+ on the client (above and beyond ACL on servers) for
+ servers which do not support setting and viewing mode bits,
+ so allowing client to check permissions is useful */
+ return generic_permission(&nop_mnt_idmap, inode, mask);
+}
+
+static struct kmem_cache *cifs_inode_cachep;
+static struct kmem_cache *cifs_req_cachep;
+static struct kmem_cache *cifs_mid_cachep;
+static struct kmem_cache *cifs_sm_req_cachep;
+mempool_t *cifs_sm_req_poolp;
+mempool_t *cifs_req_poolp;
+mempool_t *cifs_mid_poolp;
+
+static struct inode *
+cifs_alloc_inode(struct super_block *sb)
+{
+ struct cifsInodeInfo *cifs_inode;
+ cifs_inode = alloc_inode_sb(sb, cifs_inode_cachep, GFP_KERNEL);
+ if (!cifs_inode)
+ return NULL;
+ cifs_inode->cifsAttrs = 0x20; /* default */
+ cifs_inode->time = 0;
+ /*
+ * Until the file is open and we have gotten oplock info back from the
+ * server, can not assume caching of file data or metadata.
+ */
+ cifs_set_oplock_level(cifs_inode, 0);
+ cifs_inode->flags = 0;
+ spin_lock_init(&cifs_inode->writers_lock);
+ cifs_inode->writers = 0;
+ cifs_inode->netfs.inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
+ cifs_inode->server_eof = 0;
+ cifs_inode->uniqueid = 0;
+ cifs_inode->createtime = 0;
+ cifs_inode->epoch = 0;
+ spin_lock_init(&cifs_inode->open_file_lock);
+ generate_random_uuid(cifs_inode->lease_key);
+ cifs_inode->symlink_target = NULL;
+
+ /*
+ * Can not set i_flags here - they get immediately overwritten to zero
+ * by the VFS.
+ */
+ /* cifs_inode->netfs.inode.i_flags = S_NOATIME | S_NOCMTIME; */
+ INIT_LIST_HEAD(&cifs_inode->openFileList);
+ INIT_LIST_HEAD(&cifs_inode->llist);
+ INIT_LIST_HEAD(&cifs_inode->deferred_closes);
+ spin_lock_init(&cifs_inode->deferred_lock);
+ return &cifs_inode->netfs.inode;
+}
+
+static void
+cifs_free_inode(struct inode *inode)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+
+ if (S_ISLNK(inode->i_mode))
+ kfree(cinode->symlink_target);
+ kmem_cache_free(cifs_inode_cachep, cinode);
+}
+
+static void
+cifs_evict_inode(struct inode *inode)
+{
+ truncate_inode_pages_final(&inode->i_data);
+ if (inode->i_state & I_PINNING_FSCACHE_WB)
+ cifs_fscache_unuse_inode_cookie(inode, true);
+ cifs_fscache_release_inode_cookie(inode);
+ clear_inode(inode);
+}
+
+static void
+cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
+{
+ struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
+ struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
+
+ seq_puts(s, ",addr=");
+
+ switch (server->dstaddr.ss_family) {
+ case AF_INET:
+ seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
+ break;
+ case AF_INET6:
+ seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
+ if (sa6->sin6_scope_id)
+ seq_printf(s, "%%%u", sa6->sin6_scope_id);
+ break;
+ default:
+ seq_puts(s, "(unknown)");
+ }
+ if (server->rdma)
+ seq_puts(s, ",rdma");
+}
+
+static void
+cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
+{
+ if (ses->sectype == Unspecified) {
+ if (ses->user_name == NULL)
+ seq_puts(s, ",sec=none");
+ return;
+ }
+
+ seq_puts(s, ",sec=");
+
+ switch (ses->sectype) {
+ case NTLMv2:
+ seq_puts(s, "ntlmv2");
+ break;
+ case Kerberos:
+ seq_puts(s, "krb5");
+ break;
+ case RawNTLMSSP:
+ seq_puts(s, "ntlmssp");
+ break;
+ default:
+ /* shouldn't ever happen */
+ seq_puts(s, "unknown");
+ break;
+ }
+
+ if (ses->sign)
+ seq_puts(s, "i");
+
+ if (ses->sectype == Kerberos)
+ seq_printf(s, ",cruid=%u",
+ from_kuid_munged(&init_user_ns, ses->cred_uid));
+}
+
+static void
+cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
+{
+ seq_puts(s, ",cache=");
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
+ seq_puts(s, "strict");
+ else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
+ seq_puts(s, "none");
+ else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
+ seq_puts(s, "singleclient"); /* assume only one client access */
+ else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
+ seq_puts(s, "ro"); /* read only caching assumed */
+ else
+ seq_puts(s, "loose");
+}
+
+/*
+ * cifs_show_devname() is used so we show the mount device name with correct
+ * format (e.g. forward slashes vs. back slashes) in /proc/mounts
+ */
+static int cifs_show_devname(struct seq_file *m, struct dentry *root)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
+ char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL);
+
+ if (devname == NULL)
+ seq_puts(m, "none");
+ else {
+ convert_delimiter(devname, '/');
+ /* escape all spaces in share names */
+ seq_escape(m, devname, " \t");
+ kfree(devname);
+ }
+ return 0;
+}
+
+/*
+ * cifs_show_options() is for displaying mount options in /proc/mounts.
+ * Not all settable options are displayed but most of the important
+ * ones are.
+ */
+static int
+cifs_show_options(struct seq_file *s, struct dentry *root)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ struct sockaddr *srcaddr;
+ srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
+
+ seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
+ cifs_show_security(s, tcon->ses);
+ cifs_show_cache_flavor(s, cifs_sb);
+
+ if (tcon->no_lease)
+ seq_puts(s, ",nolease");
+ if (cifs_sb->ctx->multiuser)
+ seq_puts(s, ",multiuser");
+ else if (tcon->ses->user_name)
+ seq_show_option(s, "username", tcon->ses->user_name);
+
+ if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
+ seq_show_option(s, "domain", tcon->ses->domainName);
+
+ if (srcaddr->sa_family != AF_UNSPEC) {
+ struct sockaddr_in *saddr4;
+ struct sockaddr_in6 *saddr6;
+ saddr4 = (struct sockaddr_in *)srcaddr;
+ saddr6 = (struct sockaddr_in6 *)srcaddr;
+ if (srcaddr->sa_family == AF_INET6)
+ seq_printf(s, ",srcaddr=%pI6c",
+ &saddr6->sin6_addr);
+ else if (srcaddr->sa_family == AF_INET)
+ seq_printf(s, ",srcaddr=%pI4",
+ &saddr4->sin_addr.s_addr);
+ else
+ seq_printf(s, ",srcaddr=BAD-AF:%i",
+ (int)(srcaddr->sa_family));
+ }
+
+ seq_printf(s, ",uid=%u",
+ from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid));
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
+ seq_puts(s, ",forceuid");
+ else
+ seq_puts(s, ",noforceuid");
+
+ seq_printf(s, ",gid=%u",
+ from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid));
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
+ seq_puts(s, ",forcegid");
+ else
+ seq_puts(s, ",noforcegid");
+
+ cifs_show_address(s, tcon->ses->server);
+
+ if (!tcon->unix_ext)
+ seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
+ cifs_sb->ctx->file_mode,
+ cifs_sb->ctx->dir_mode);
+ if (cifs_sb->ctx->iocharset)
+ seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset);
+ if (tcon->seal)
+ seq_puts(s, ",seal");
+ else if (tcon->ses->server->ignore_signature)
+ seq_puts(s, ",signloosely");
+ if (tcon->nocase)
+ seq_puts(s, ",nocase");
+ if (tcon->nodelete)
+ seq_puts(s, ",nodelete");
+ if (cifs_sb->ctx->no_sparse)
+ seq_puts(s, ",nosparse");
+ if (tcon->local_lease)
+ seq_puts(s, ",locallease");
+ if (tcon->retry)
+ seq_puts(s, ",hard");
+ else
+ seq_puts(s, ",soft");
+ if (tcon->use_persistent)
+ seq_puts(s, ",persistenthandles");
+ else if (tcon->use_resilient)
+ seq_puts(s, ",resilienthandles");
+ if (tcon->posix_extensions)
+ seq_puts(s, ",posix");
+ else if (tcon->unix_ext)
+ seq_puts(s, ",unix");
+ else
+ seq_puts(s, ",nounix");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
+ seq_puts(s, ",nodfs");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
+ seq_puts(s, ",posixpaths");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
+ seq_puts(s, ",setuids");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
+ seq_puts(s, ",idsfromsid");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
+ seq_puts(s, ",serverino");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ seq_puts(s, ",rwpidforward");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
+ seq_puts(s, ",forcemand");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
+ seq_puts(s, ",nouser_xattr");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
+ seq_puts(s, ",mapchars");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
+ seq_puts(s, ",mapposix");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
+ seq_puts(s, ",sfu");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+ seq_puts(s, ",nobrl");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
+ seq_puts(s, ",nohandlecache");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
+ seq_puts(s, ",modefromsid");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
+ seq_puts(s, ",cifsacl");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+ seq_puts(s, ",dynperm");
+ if (root->d_sb->s_flags & SB_POSIXACL)
+ seq_puts(s, ",acl");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
+ seq_puts(s, ",mfsymlinks");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
+ seq_puts(s, ",fsc");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
+ seq_puts(s, ",nostrictsync");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
+ seq_puts(s, ",noperm");
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
+ seq_printf(s, ",backupuid=%u",
+ from_kuid_munged(&init_user_ns,
+ cifs_sb->ctx->backupuid));
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
+ seq_printf(s, ",backupgid=%u",
+ from_kgid_munged(&init_user_ns,
+ cifs_sb->ctx->backupgid));
+
+ seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
+ seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
+ seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
+ if (cifs_sb->ctx->rasize)
+ seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize);
+ if (tcon->ses->server->min_offload)
+ seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
+ seq_printf(s, ",echo_interval=%lu",
+ tcon->ses->server->echo_interval / HZ);
+
+ /* Only display the following if overridden on mount */
+ if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
+ seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
+ if (tcon->ses->server->tcp_nodelay)
+ seq_puts(s, ",tcpnodelay");
+ if (tcon->ses->server->noautotune)
+ seq_puts(s, ",noautotune");
+ if (tcon->ses->server->noblocksnd)
+ seq_puts(s, ",noblocksend");
+
+ if (tcon->snapshot_time)
+ seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
+ if (tcon->handle_timeout)
+ seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
+
+ /*
+ * Display file and directory attribute timeout in seconds.
+ * If file and directory attribute timeout the same then actimeo
+ * was likely specified on mount
+ */
+ if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax)
+ seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ);
+ else {
+ seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ);
+ seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ);
+ }
+ seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / HZ);
+
+ if (tcon->ses->chan_max > 1)
+ seq_printf(s, ",multichannel,max_channels=%zu",
+ tcon->ses->chan_max);
+
+ if (tcon->use_witness)
+ seq_puts(s, ",witness");
+
+ return 0;
+}
+
+static void cifs_umount_begin(struct super_block *sb)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_tcon *tcon;
+
+ if (cifs_sb == NULL)
+ return;
+
+ tcon = cifs_sb_master_tcon(cifs_sb);
+
+ spin_lock(&cifs_tcp_ses_lock);
+ spin_lock(&tcon->tc_lock);
+ if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) {
+ /* we have other mounts to same share or we have
+ already tried to umount this and woken up
+ all waiting network requests, nothing to do */
+ spin_unlock(&tcon->tc_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
+ return;
+ }
+ /*
+ * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will
+ * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent
+ */
+ spin_unlock(&tcon->tc_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ cifs_close_all_deferred_files(tcon);
+ /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
+ /* cancel_notify_requests(tcon); */
+ if (tcon->ses && tcon->ses->server) {
+ cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
+ wake_up_all(&tcon->ses->server->request_q);
+ wake_up_all(&tcon->ses->server->response_q);
+ msleep(1); /* yield */
+ /* we have to kick the requests once more */
+ wake_up_all(&tcon->ses->server->response_q);
+ msleep(1);
+ }
+
+ return;
+}
+
+static int cifs_freeze(struct super_block *sb)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_tcon *tcon;
+
+ if (cifs_sb == NULL)
+ return 0;
+
+ tcon = cifs_sb_master_tcon(cifs_sb);
+
+ cifs_close_all_deferred_files(tcon);
+ return 0;
+}
+
+#ifdef CONFIG_CIFS_STATS2
+static int cifs_show_stats(struct seq_file *s, struct dentry *root)
+{
+ /* BB FIXME */
+ return 0;
+}
+#endif
+
+static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ fscache_unpin_writeback(wbc, cifs_inode_cookie(inode));
+ return 0;
+}
+
+static int cifs_drop_inode(struct inode *inode)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+ /* no serverino => unconditional eviction */
+ return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
+ generic_drop_inode(inode);
+}
+
+static const struct super_operations cifs_super_ops = {
+ .statfs = cifs_statfs,
+ .alloc_inode = cifs_alloc_inode,
+ .write_inode = cifs_write_inode,
+ .free_inode = cifs_free_inode,
+ .drop_inode = cifs_drop_inode,
+ .evict_inode = cifs_evict_inode,
+/* .show_path = cifs_show_path, */ /* Would we ever need show path? */
+ .show_devname = cifs_show_devname,
+/* .delete_inode = cifs_delete_inode, */ /* Do not need above
+ function unless later we add lazy close of inodes or unless the
+ kernel forgets to call us with the same number of releases (closes)
+ as opens */
+ .show_options = cifs_show_options,
+ .umount_begin = cifs_umount_begin,
+ .freeze_fs = cifs_freeze,
+#ifdef CONFIG_CIFS_STATS2
+ .show_stats = cifs_show_stats,
+#endif
+};
+
+/*
+ * Get root dentry from superblock according to prefix path mount option.
+ * Return dentry with refcount + 1 on success and NULL otherwise.
+ */
+static struct dentry *
+cifs_get_root(struct smb3_fs_context *ctx, struct super_block *sb)
+{
+ struct dentry *dentry;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ char *full_path = NULL;
+ char *s, *p;
+ char sep;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
+ return dget(sb->s_root);
+
+ full_path = cifs_build_path_to_root(ctx, cifs_sb,
+ cifs_sb_master_tcon(cifs_sb), 0);
+ if (full_path == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
+
+ sep = CIFS_DIR_SEP(cifs_sb);
+ dentry = dget(sb->s_root);
+ s = full_path;
+
+ do {
+ struct inode *dir = d_inode(dentry);
+ struct dentry *child;
+
+ if (!S_ISDIR(dir->i_mode)) {
+ dput(dentry);
+ dentry = ERR_PTR(-ENOTDIR);
+ break;
+ }
+
+ /* skip separators */
+ while (*s == sep)
+ s++;
+ if (!*s)
+ break;
+ p = s++;
+ /* next separator */
+ while (*s && *s != sep)
+ s++;
+
+ child = lookup_positive_unlocked(p, dentry, s - p);
+ dput(dentry);
+ dentry = child;
+ } while (!IS_ERR(dentry));
+ kfree(full_path);
+ return dentry;
+}
+
+static int cifs_set_super(struct super_block *sb, void *data)
+{
+ struct cifs_mnt_data *mnt_data = data;
+ sb->s_fs_info = mnt_data->cifs_sb;
+ return set_anon_super(sb, NULL);
+}
+
+struct dentry *
+cifs_smb3_do_mount(struct file_system_type *fs_type,
+ int flags, struct smb3_fs_context *old_ctx)
+{
+ int rc;
+ struct super_block *sb = NULL;
+ struct cifs_sb_info *cifs_sb = NULL;
+ struct cifs_mnt_data mnt_data;
+ struct dentry *root;
+
+ if (cifsFYI) {
+ cifs_dbg(FYI, "%s: devname=%s flags=0x%x\n", __func__,
+ old_ctx->source, flags);
+ } else {
+ cifs_info("Attempting to mount %s\n", old_ctx->source);
+ }
+
+ cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
+ if (cifs_sb == NULL) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
+ if (!cifs_sb->ctx) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx);
+ if (rc) {
+ root = ERR_PTR(rc);
+ goto out;
+ }
+
+ rc = cifs_setup_cifs_sb(cifs_sb);
+ if (rc) {
+ root = ERR_PTR(rc);
+ goto out;
+ }
+
+ rc = cifs_mount(cifs_sb, cifs_sb->ctx);
+ if (rc) {
+ if (!(flags & SB_SILENT))
+ cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
+ rc);
+ root = ERR_PTR(rc);
+ goto out;
+ }
+
+ mnt_data.ctx = cifs_sb->ctx;
+ mnt_data.cifs_sb = cifs_sb;
+ mnt_data.flags = flags;
+
+ /* BB should we make this contingent on mount parm? */
+ flags |= SB_NODIRATIME | SB_NOATIME;
+
+ sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
+ if (IS_ERR(sb)) {
+ root = ERR_CAST(sb);
+ cifs_umount(cifs_sb);
+ cifs_sb = NULL;
+ goto out;
+ }
+
+ if (sb->s_root) {
+ cifs_dbg(FYI, "Use existing superblock\n");
+ cifs_umount(cifs_sb);
+ cifs_sb = NULL;
+ } else {
+ rc = cifs_read_super(sb);
+ if (rc) {
+ root = ERR_PTR(rc);
+ goto out_super;
+ }
+
+ sb->s_flags |= SB_ACTIVE;
+ }
+
+ root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb);
+ if (IS_ERR(root))
+ goto out_super;
+
+ if (cifs_sb)
+ cifs_sb->root = dget(root);
+
+ cifs_dbg(FYI, "dentry root is: %p\n", root);
+ return root;
+
+out_super:
+ deactivate_locked_super(sb);
+ return root;
+out:
+ if (cifs_sb) {
+ if (!sb || IS_ERR(sb)) { /* otherwise kill_sb will handle */
+ kfree(cifs_sb->prepath);
+ smb3_cleanup_fs_context(cifs_sb->ctx);
+ kfree(cifs_sb);
+ }
+ }
+ return root;
+}
+
+
+static ssize_t
+cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
+{
+ ssize_t rc;
+ struct inode *inode = file_inode(iocb->ki_filp);
+
+ if (iocb->ki_flags & IOCB_DIRECT)
+ return cifs_user_readv(iocb, iter);
+
+ rc = cifs_revalidate_mapping(inode);
+ if (rc)
+ return rc;
+
+ return generic_file_read_iter(iocb, iter);
+}
+
+static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ ssize_t written;
+ int rc;
+
+ if (iocb->ki_filp->f_flags & O_DIRECT) {
+ written = cifs_user_writev(iocb, from);
+ if (written > 0 && CIFS_CACHE_READ(cinode)) {
+ cifs_zap_mapping(inode);
+ cifs_dbg(FYI,
+ "Set no oplock for inode=%p after a write operation\n",
+ inode);
+ cinode->oplock = 0;
+ }
+ return written;
+ }
+
+ written = cifs_get_writer(cinode);
+ if (written)
+ return written;
+
+ written = generic_file_write_iter(iocb, from);
+
+ if (CIFS_CACHE_WRITE(CIFS_I(inode)))
+ goto out;
+
+ rc = filemap_fdatawrite(inode->i_mapping);
+ if (rc)
+ cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
+ rc, inode);
+
+out:
+ cifs_put_writer(cinode);
+ return written;
+}
+
+static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
+{
+ struct cifsFileInfo *cfile = file->private_data;
+ struct cifs_tcon *tcon;
+
+ /*
+ * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
+ * the cached file length
+ */
+ if (whence != SEEK_SET && whence != SEEK_CUR) {
+ int rc;
+ struct inode *inode = file_inode(file);
+
+ /*
+ * We need to be sure that all dirty pages are written and the
+ * server has the newest file length.
+ */
+ if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
+ inode->i_mapping->nrpages != 0) {
+ rc = filemap_fdatawait(inode->i_mapping);
+ if (rc) {
+ mapping_set_error(inode->i_mapping, rc);
+ return rc;
+ }
+ }
+ /*
+ * Some applications poll for the file length in this strange
+ * way so we must seek to end on non-oplocked files by
+ * setting the revalidate time to zero.
+ */
+ CIFS_I(inode)->time = 0;
+
+ rc = cifs_revalidate_file_attr(file);
+ if (rc < 0)
+ return (loff_t)rc;
+ }
+ if (cfile && cfile->tlink) {
+ tcon = tlink_tcon(cfile->tlink);
+ if (tcon->ses->server->ops->llseek)
+ return tcon->ses->server->ops->llseek(file, tcon,
+ offset, whence);
+ }
+ return generic_file_llseek(file, offset, whence);
+}
+
+static int
+cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
+{
+ /*
+ * Note that this is called by vfs setlease with i_lock held to
+ * protect *lease from going away.
+ */
+ struct inode *inode = file_inode(file);
+ struct cifsFileInfo *cfile = file->private_data;
+
+ if (!(S_ISREG(inode->i_mode)))
+ return -EINVAL;
+
+ /* Check if file is oplocked if this is request for new lease */
+ if (arg == F_UNLCK ||
+ ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
+ ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
+ return generic_setlease(file, arg, lease, priv);
+ else if (tlink_tcon(cfile->tlink)->local_lease &&
+ !CIFS_CACHE_READ(CIFS_I(inode)))
+ /*
+ * If the server claims to support oplock on this file, then we
+ * still need to check oplock even if the local_lease mount
+ * option is set, but there are servers which do not support
+ * oplock for which this mount option may be useful if the user
+ * knows that the file won't be changed on the server by anyone
+ * else.
+ */
+ return generic_setlease(file, arg, lease, priv);
+ else
+ return -EAGAIN;
+}
+
+struct file_system_type cifs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "cifs",
+ .init_fs_context = smb3_init_fs_context,
+ .parameters = smb3_fs_parameters,
+ .kill_sb = cifs_kill_sb,
+ .fs_flags = FS_RENAME_DOES_D_MOVE,
+};
+MODULE_ALIAS_FS("cifs");
+
+struct file_system_type smb3_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "smb3",
+ .init_fs_context = smb3_init_fs_context,
+ .parameters = smb3_fs_parameters,
+ .kill_sb = cifs_kill_sb,
+ .fs_flags = FS_RENAME_DOES_D_MOVE,
+};
+MODULE_ALIAS_FS("smb3");
+MODULE_ALIAS("smb3");
+
+const struct inode_operations cifs_dir_inode_ops = {
+ .create = cifs_create,
+ .atomic_open = cifs_atomic_open,
+ .lookup = cifs_lookup,
+ .getattr = cifs_getattr,
+ .unlink = cifs_unlink,
+ .link = cifs_hardlink,
+ .mkdir = cifs_mkdir,
+ .rmdir = cifs_rmdir,
+ .rename = cifs_rename2,
+ .permission = cifs_permission,
+ .setattr = cifs_setattr,
+ .symlink = cifs_symlink,
+ .mknod = cifs_mknod,
+ .listxattr = cifs_listxattr,
+ .get_acl = cifs_get_acl,
+ .set_acl = cifs_set_acl,
+};
+
+const struct inode_operations cifs_file_inode_ops = {
+ .setattr = cifs_setattr,
+ .getattr = cifs_getattr,
+ .permission = cifs_permission,
+ .listxattr = cifs_listxattr,
+ .fiemap = cifs_fiemap,
+ .get_acl = cifs_get_acl,
+ .set_acl = cifs_set_acl,
+};
+
+const char *cifs_get_link(struct dentry *dentry, struct inode *inode,
+ struct delayed_call *done)
+{
+ char *target_path;
+
+ target_path = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (!target_path)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock(&inode->i_lock);
+ if (likely(CIFS_I(inode)->symlink_target)) {
+ strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX);
+ } else {
+ kfree(target_path);
+ target_path = ERR_PTR(-EOPNOTSUPP);
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (!IS_ERR(target_path))
+ set_delayed_call(done, kfree_link, target_path);
+
+ return target_path;
+}
+
+const struct inode_operations cifs_symlink_inode_ops = {
+ .get_link = cifs_get_link,
+ .permission = cifs_permission,
+ .listxattr = cifs_listxattr,
+};
+
+static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff, loff_t len,
+ unsigned int remap_flags)
+{
+ struct inode *src_inode = file_inode(src_file);
+ struct inode *target_inode = file_inode(dst_file);
+ struct cifsFileInfo *smb_file_src = src_file->private_data;
+ struct cifsFileInfo *smb_file_target;
+ struct cifs_tcon *target_tcon;
+ unsigned int xid;
+ int rc;
+
+ if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
+ return -EINVAL;
+
+ cifs_dbg(FYI, "clone range\n");
+
+ xid = get_xid();
+
+ if (!src_file->private_data || !dst_file->private_data) {
+ rc = -EBADF;
+ cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
+ goto out;
+ }
+
+ smb_file_target = dst_file->private_data;
+ target_tcon = tlink_tcon(smb_file_target->tlink);
+
+ /*
+ * Note: cifs case is easier than btrfs since server responsible for
+ * checks for proper open modes and file type and if it wants
+ * server could even support copy of range where source = target
+ */
+ lock_two_nondirectories(target_inode, src_inode);
+
+ if (len == 0)
+ len = src_inode->i_size - off;
+
+ cifs_dbg(FYI, "about to flush pages\n");
+ /* should we flush first and last page first */
+ truncate_inode_pages_range(&target_inode->i_data, destoff,
+ PAGE_ALIGN(destoff + len)-1);
+
+ if (target_tcon->ses->server->ops->duplicate_extents)
+ rc = target_tcon->ses->server->ops->duplicate_extents(xid,
+ smb_file_src, smb_file_target, off, len, destoff);
+ else
+ rc = -EOPNOTSUPP;
+
+ /* force revalidate of size and timestamps of target file now
+ that target is updated on the server */
+ CIFS_I(target_inode)->time = 0;
+ /* although unlocking in the reverse order from locking is not
+ strictly necessary here it is a little cleaner to be consistent */
+ unlock_two_nondirectories(src_inode, target_inode);
+out:
+ free_xid(xid);
+ return rc < 0 ? rc : len;
+}
+
+ssize_t cifs_file_copychunk_range(unsigned int xid,
+ struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff,
+ size_t len, unsigned int flags)
+{
+ struct inode *src_inode = file_inode(src_file);
+ struct inode *target_inode = file_inode(dst_file);
+ struct cifsFileInfo *smb_file_src;
+ struct cifsFileInfo *smb_file_target;
+ struct cifs_tcon *src_tcon;
+ struct cifs_tcon *target_tcon;
+ ssize_t rc;
+
+ cifs_dbg(FYI, "copychunk range\n");
+
+ if (!src_file->private_data || !dst_file->private_data) {
+ rc = -EBADF;
+ cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
+ goto out;
+ }
+
+ rc = -EXDEV;
+ smb_file_target = dst_file->private_data;
+ smb_file_src = src_file->private_data;
+ src_tcon = tlink_tcon(smb_file_src->tlink);
+ target_tcon = tlink_tcon(smb_file_target->tlink);
+
+ if (src_tcon->ses != target_tcon->ses) {
+ cifs_dbg(VFS, "source and target of copy not on same server\n");
+ goto out;
+ }
+
+ rc = -EOPNOTSUPP;
+ if (!target_tcon->ses->server->ops->copychunk_range)
+ goto out;
+
+ /*
+ * Note: cifs case is easier than btrfs since server responsible for
+ * checks for proper open modes and file type and if it wants
+ * server could even support copy of range where source = target
+ */
+ lock_two_nondirectories(target_inode, src_inode);
+
+ cifs_dbg(FYI, "about to flush pages\n");
+
+ rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
+ off + len - 1);
+ if (rc)
+ goto unlock;
+
+ /* should we flush first and last page first */
+ truncate_inode_pages(&target_inode->i_data, 0);
+
+ rc = file_modified(dst_file);
+ if (!rc)
+ rc = target_tcon->ses->server->ops->copychunk_range(xid,
+ smb_file_src, smb_file_target, off, len, destoff);
+
+ file_accessed(src_file);
+
+ /* force revalidate of size and timestamps of target file now
+ * that target is updated on the server
+ */
+ CIFS_I(target_inode)->time = 0;
+
+unlock:
+ /* although unlocking in the reverse order from locking is not
+ * strictly necessary here it is a little cleaner to be consistent
+ */
+ unlock_two_nondirectories(src_inode, target_inode);
+
+out:
+ return rc;
+}
+
+/*
+ * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
+ * is a dummy operation.
+ */
+static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
+ file, datasync);
+
+ return 0;
+}
+
+static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff,
+ size_t len, unsigned int flags)
+{
+ unsigned int xid = get_xid();
+ ssize_t rc;
+ struct cifsFileInfo *cfile = dst_file->private_data;
+
+ if (cfile->swapfile) {
+ rc = -EOPNOTSUPP;
+ free_xid(xid);
+ return rc;
+ }
+
+ rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
+ len, flags);
+ free_xid(xid);
+
+ if (rc == -EOPNOTSUPP || rc == -EXDEV)
+ rc = generic_copy_file_range(src_file, off, dst_file,
+ destoff, len, flags);
+ return rc;
+}
+
+const struct file_operations cifs_file_ops = {
+ .read_iter = cifs_loose_read_iter,
+ .write_iter = cifs_file_write_iter,
+ .open = cifs_open,
+ .release = cifs_close,
+ .lock = cifs_lock,
+ .flock = cifs_flock,
+ .fsync = cifs_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_mmap,
- .splice_read = cifs_splice_read,
++ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .llseek = cifs_llseek,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_file_strict_ops = {
+ .read_iter = cifs_strict_readv,
+ .write_iter = cifs_strict_writev,
+ .open = cifs_open,
+ .release = cifs_close,
+ .lock = cifs_lock,
+ .flock = cifs_flock,
+ .fsync = cifs_strict_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_strict_mmap,
- .splice_read = direct_splice_read,
++ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .llseek = cifs_llseek,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_file_direct_ops = {
+ .read_iter = cifs_direct_readv,
+ .write_iter = cifs_direct_writev,
+ .open = cifs_open,
+ .release = cifs_close,
+ .lock = cifs_lock,
+ .flock = cifs_flock,
+ .fsync = cifs_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_mmap,
- .splice_read = cifs_splice_read,
++ .splice_read = copy_splice_read,
+ .splice_write = iter_file_splice_write,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .llseek = cifs_llseek,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_file_nobrl_ops = {
+ .read_iter = cifs_loose_read_iter,
+ .write_iter = cifs_file_write_iter,
+ .open = cifs_open,
+ .release = cifs_close,
+ .fsync = cifs_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_mmap,
- .splice_read = cifs_splice_read,
++ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .llseek = cifs_llseek,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_file_strict_nobrl_ops = {
+ .read_iter = cifs_strict_readv,
+ .write_iter = cifs_strict_writev,
+ .open = cifs_open,
+ .release = cifs_close,
+ .fsync = cifs_strict_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_strict_mmap,
- .splice_read = direct_splice_read,
++ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .llseek = cifs_llseek,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_file_direct_nobrl_ops = {
+ .read_iter = cifs_direct_readv,
+ .write_iter = cifs_direct_writev,
+ .open = cifs_open,
+ .release = cifs_close,
+ .fsync = cifs_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_mmap,
++ .splice_read = copy_splice_read,
+ .splice_write = iter_file_splice_write,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .llseek = cifs_llseek,
+ .setlease = cifs_setlease,
+ .fallocate = cifs_fallocate,
+};
+
+const struct file_operations cifs_dir_ops = {
+ .iterate_shared = cifs_readdir,
+ .release = cifs_closedir,
+ .read = generic_read_dir,
+ .unlocked_ioctl = cifs_ioctl,
+ .copy_file_range = cifs_copy_file_range,
+ .remap_file_range = cifs_remap_file_range,
+ .llseek = generic_file_llseek,
+ .fsync = cifs_dir_fsync,
+};
+
+static void
+cifs_init_once(void *inode)
+{
+ struct cifsInodeInfo *cifsi = inode;
+
+ inode_init_once(&cifsi->netfs.inode);
+ init_rwsem(&cifsi->lock_sem);
+}
+
+static int __init
+cifs_init_inodecache(void)
+{
+ cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
+ sizeof(struct cifsInodeInfo),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ cifs_init_once);
+ if (cifs_inode_cachep == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void
+cifs_destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(cifs_inode_cachep);
+}
+
+static int
+cifs_init_request_bufs(void)
+{
+ /*
+ * SMB2 maximum header size is bigger than CIFS one - no problems to
+ * allocate some more bytes for CIFS.
+ */
+ size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
+
+ if (CIFSMaxBufSize < 8192) {
+ /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
+ Unicode path name has to fit in any SMB/CIFS path based frames */
+ CIFSMaxBufSize = 8192;
+ } else if (CIFSMaxBufSize > 1024*127) {
+ CIFSMaxBufSize = 1024 * 127;
+ } else {
+ CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
+ }
+/*
+ cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
+ CIFSMaxBufSize, CIFSMaxBufSize);
+*/
+ cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
+ CIFSMaxBufSize + max_hdr_size, 0,
+ SLAB_HWCACHE_ALIGN, 0,
+ CIFSMaxBufSize + max_hdr_size,
+ NULL);
+ if (cifs_req_cachep == NULL)
+ return -ENOMEM;
+
+ if (cifs_min_rcv < 1)
+ cifs_min_rcv = 1;
+ else if (cifs_min_rcv > 64) {
+ cifs_min_rcv = 64;
+ cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
+ }
+
+ cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
+ cifs_req_cachep);
+
+ if (cifs_req_poolp == NULL) {
+ kmem_cache_destroy(cifs_req_cachep);
+ return -ENOMEM;
+ }
+ /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
+ almost all handle based requests (but not write response, nor is it
+ sufficient for path based requests). A smaller size would have
+ been more efficient (compacting multiple slab items on one 4k page)
+ for the case in which debug was on, but this larger size allows
+ more SMBs to use small buffer alloc and is still much more
+ efficient to alloc 1 per page off the slab compared to 17K (5page)
+ alloc of large cifs buffers even when page debugging is on */
+ cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
+ MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
+ 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
+ if (cifs_sm_req_cachep == NULL) {
+ mempool_destroy(cifs_req_poolp);
+ kmem_cache_destroy(cifs_req_cachep);
+ return -ENOMEM;
+ }
+
+ if (cifs_min_small < 2)
+ cifs_min_small = 2;
+ else if (cifs_min_small > 256) {
+ cifs_min_small = 256;
+ cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
+ }
+
+ cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
+ cifs_sm_req_cachep);
+
+ if (cifs_sm_req_poolp == NULL) {
+ mempool_destroy(cifs_req_poolp);
+ kmem_cache_destroy(cifs_req_cachep);
+ kmem_cache_destroy(cifs_sm_req_cachep);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void
+cifs_destroy_request_bufs(void)
+{
+ mempool_destroy(cifs_req_poolp);
+ kmem_cache_destroy(cifs_req_cachep);
+ mempool_destroy(cifs_sm_req_poolp);
+ kmem_cache_destroy(cifs_sm_req_cachep);
+}
+
+static int init_mids(void)
+{
+ cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
+ sizeof(struct mid_q_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (cifs_mid_cachep == NULL)
+ return -ENOMEM;
+
+ /* 3 is a reasonable minimum number of simultaneous operations */
+ cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
+ if (cifs_mid_poolp == NULL) {
+ kmem_cache_destroy(cifs_mid_cachep);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void destroy_mids(void)
+{
+ mempool_destroy(cifs_mid_poolp);
+ kmem_cache_destroy(cifs_mid_cachep);
+}
+
+static int __init
+init_cifs(void)
+{
+ int rc = 0;
+ cifs_proc_init();
+ INIT_LIST_HEAD(&cifs_tcp_ses_list);
+/*
+ * Initialize Global counters
+ */
+ atomic_set(&sesInfoAllocCount, 0);
+ atomic_set(&tconInfoAllocCount, 0);
+ atomic_set(&tcpSesNextId, 0);
+ atomic_set(&tcpSesAllocCount, 0);
+ atomic_set(&tcpSesReconnectCount, 0);
+ atomic_set(&tconInfoReconnectCount, 0);
+
+ atomic_set(&buf_alloc_count, 0);
+ atomic_set(&small_buf_alloc_count, 0);
+#ifdef CONFIG_CIFS_STATS2
+ atomic_set(&total_buf_alloc_count, 0);
+ atomic_set(&total_small_buf_alloc_count, 0);
+ if (slow_rsp_threshold < 1)
+ cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
+ else if (slow_rsp_threshold > 32767)
+ cifs_dbg(VFS,
+ "slow response threshold set higher than recommended (0 to 32767)\n");
+#endif /* CONFIG_CIFS_STATS2 */
+
+ atomic_set(&mid_count, 0);
+ GlobalCurrentXid = 0;
+ GlobalTotalActiveXid = 0;
+ GlobalMaxActiveXid = 0;
+ spin_lock_init(&cifs_tcp_ses_lock);
+ spin_lock_init(&GlobalMid_Lock);
+
+ cifs_lock_secret = get_random_u32();
+
+ if (cifs_max_pending < 2) {
+ cifs_max_pending = 2;
+ cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
+ } else if (cifs_max_pending > CIFS_MAX_REQ) {
+ cifs_max_pending = CIFS_MAX_REQ;
+ cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
+ CIFS_MAX_REQ);
+ }
+
+ cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ if (!cifsiod_wq) {
+ rc = -ENOMEM;
+ goto out_clean_proc;
+ }
+
+ /*
+ * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
+ * so that we don't launch too many worker threads but
+ * Documentation/core-api/workqueue.rst recommends setting it to 0
+ */
+
+ /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
+ decrypt_wq = alloc_workqueue("smb3decryptd",
+ WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ if (!decrypt_wq) {
+ rc = -ENOMEM;
+ goto out_destroy_cifsiod_wq;
+ }
+
+ fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
+ WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ if (!fileinfo_put_wq) {
+ rc = -ENOMEM;
+ goto out_destroy_decrypt_wq;
+ }
+
+ cifsoplockd_wq = alloc_workqueue("cifsoplockd",
+ WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ if (!cifsoplockd_wq) {
+ rc = -ENOMEM;
+ goto out_destroy_fileinfo_put_wq;
+ }
+
+ deferredclose_wq = alloc_workqueue("deferredclose",
+ WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ if (!deferredclose_wq) {
+ rc = -ENOMEM;
+ goto out_destroy_cifsoplockd_wq;
+ }
+
+ rc = cifs_init_inodecache();
+ if (rc)
+ goto out_destroy_deferredclose_wq;
+
+ rc = init_mids();
+ if (rc)
+ goto out_destroy_inodecache;
+
+ rc = cifs_init_request_bufs();
+ if (rc)
+ goto out_destroy_mids;
+
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ rc = dfs_cache_init();
+ if (rc)
+ goto out_destroy_request_bufs;
+#endif /* CONFIG_CIFS_DFS_UPCALL */
+#ifdef CONFIG_CIFS_UPCALL
+ rc = init_cifs_spnego();
+ if (rc)
+ goto out_destroy_dfs_cache;
+#endif /* CONFIG_CIFS_UPCALL */
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ rc = cifs_genl_init();
+ if (rc)
+ goto out_register_key_type;
+#endif /* CONFIG_CIFS_SWN_UPCALL */
+
+ rc = init_cifs_idmap();
+ if (rc)
+ goto out_cifs_swn_init;
+
+ rc = register_filesystem(&cifs_fs_type);
+ if (rc)
+ goto out_init_cifs_idmap;
+
+ rc = register_filesystem(&smb3_fs_type);
+ if (rc) {
+ unregister_filesystem(&cifs_fs_type);
+ goto out_init_cifs_idmap;
+ }
+
+ return 0;
+
+out_init_cifs_idmap:
+ exit_cifs_idmap();
+out_cifs_swn_init:
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ cifs_genl_exit();
+out_register_key_type:
+#endif
+#ifdef CONFIG_CIFS_UPCALL
+ exit_cifs_spnego();
+out_destroy_dfs_cache:
+#endif
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ dfs_cache_destroy();
+out_destroy_request_bufs:
+#endif
+ cifs_destroy_request_bufs();
+out_destroy_mids:
+ destroy_mids();
+out_destroy_inodecache:
+ cifs_destroy_inodecache();
+out_destroy_deferredclose_wq:
+ destroy_workqueue(deferredclose_wq);
+out_destroy_cifsoplockd_wq:
+ destroy_workqueue(cifsoplockd_wq);
+out_destroy_fileinfo_put_wq:
+ destroy_workqueue(fileinfo_put_wq);
+out_destroy_decrypt_wq:
+ destroy_workqueue(decrypt_wq);
+out_destroy_cifsiod_wq:
+ destroy_workqueue(cifsiod_wq);
+out_clean_proc:
+ cifs_proc_clean();
+ return rc;
+}
+
+static void __exit
+exit_cifs(void)
+{
+ cifs_dbg(NOISY, "exit_smb3\n");
+ unregister_filesystem(&cifs_fs_type);
+ unregister_filesystem(&smb3_fs_type);
+ cifs_dfs_release_automount_timer();
+ exit_cifs_idmap();
+#ifdef CONFIG_CIFS_SWN_UPCALL
+ cifs_genl_exit();
+#endif
+#ifdef CONFIG_CIFS_UPCALL
+ exit_cifs_spnego();
+#endif
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ dfs_cache_destroy();
+#endif
+ cifs_destroy_request_bufs();
+ destroy_mids();
+ cifs_destroy_inodecache();
+ destroy_workqueue(deferredclose_wq);
+ destroy_workqueue(cifsoplockd_wq);
+ destroy_workqueue(decrypt_wq);
+ destroy_workqueue(fileinfo_put_wq);
+ destroy_workqueue(cifsiod_wq);
+ cifs_proc_clean();
+}
+
+MODULE_AUTHOR("Steve French");
+MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
+MODULE_DESCRIPTION
+ ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
+ "also older servers complying with the SNIA CIFS Specification)");
+MODULE_VERSION(CIFS_VERSION);
+MODULE_SOFTDEP("ecb");
+MODULE_SOFTDEP("hmac");
+MODULE_SOFTDEP("md5");
+MODULE_SOFTDEP("nls");
+MODULE_SOFTDEP("aes");
+MODULE_SOFTDEP("cmac");
+MODULE_SOFTDEP("sha256");
+MODULE_SOFTDEP("sha512");
+MODULE_SOFTDEP("aead2");
+MODULE_SOFTDEP("ccm");
+MODULE_SOFTDEP("gcm");
+module_init(init_cifs)
+module_exit(exit_cifs)
--- /dev/null
-
- /*
- * Splice data from a file into a pipe.
- */
- ssize_t cifs_splice_read(struct file *in, loff_t *ppos,
- struct pipe_inode_info *pipe, size_t len,
- unsigned int flags)
- {
- if (unlikely(*ppos >= file_inode(in)->i_sb->s_maxbytes))
- return 0;
- if (unlikely(!len))
- return 0;
- if (in->f_flags & O_DIRECT)
- return direct_splice_read(in, ppos, pipe, len, flags);
- return filemap_splice_read(in, ppos, pipe, len, flags);
- }
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ * vfs operations that deal with files
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2010
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ * Jeremy Allison (jra@samba.org)
+ *
+ */
+#include <linux/fs.h>
+#include <linux/filelock.h>
+#include <linux/backing-dev.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/pagemap.h>
+#include <linux/pagevec.h>
+#include <linux/writeback.h>
+#include <linux/task_io_accounting_ops.h>
+#include <linux/delay.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/swap.h>
+#include <linux/mm.h>
+#include <asm/div64.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "smb2proto.h"
+#include "cifs_unicode.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "fscache.h"
+#include "smbdirect.h"
+#include "fs_context.h"
+#include "cifs_ioctl.h"
+#include "cached_dir.h"
+
+/*
+ * Remove the dirty flags from a span of pages.
+ */
+static void cifs_undirty_folios(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each_marked(&xas, folio, end, PAGECACHE_TAG_DIRTY) {
+ if (xas_retry(&xas, folio))
+ continue;
+ xas_pause(&xas);
+ rcu_read_unlock();
+ folio_lock(folio);
+ folio_clear_dirty_for_io(folio);
+ folio_unlock(folio);
+ rcu_read_lock();
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Completion of write to server.
+ */
+void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (xas_retry(&xas, folio))
+ continue;
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ folio_detach_private(folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Failure of write to server.
+ */
+void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (xas_retry(&xas, folio))
+ continue;
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ folio_set_error(folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Redirty pages after a temporary failure.
+ */
+void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ filemap_dirty_folio(folio->mapping, folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Mark as invalid, all open files on tree connections since they
+ * were closed when session to server was lost.
+ */
+void
+cifs_mark_open_files_invalid(struct cifs_tcon *tcon)
+{
+ struct cifsFileInfo *open_file = NULL;
+ struct list_head *tmp;
+ struct list_head *tmp1;
+
+ /* only send once per connect */
+ spin_lock(&tcon->tc_lock);
+ if (tcon->status != TID_NEED_RECON) {
+ spin_unlock(&tcon->tc_lock);
+ return;
+ }
+ tcon->status = TID_IN_FILES_INVALIDATE;
+ spin_unlock(&tcon->tc_lock);
+
+ /* list all files open on tree connection and mark them invalid */
+ spin_lock(&tcon->open_file_lock);
+ list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
+ open_file = list_entry(tmp, struct cifsFileInfo, tlist);
+ open_file->invalidHandle = true;
+ open_file->oplock_break_cancelled = true;
+ }
+ spin_unlock(&tcon->open_file_lock);
+
+ invalidate_all_cached_dirs(tcon);
+ spin_lock(&tcon->tc_lock);
+ if (tcon->status == TID_IN_FILES_INVALIDATE)
+ tcon->status = TID_NEED_TCON;
+ spin_unlock(&tcon->tc_lock);
+
+ /*
+ * BB Add call to invalidate_inodes(sb) for all superblocks mounted
+ * to this tcon.
+ */
+}
+
+static inline int cifs_convert_flags(unsigned int flags)
+{
+ if ((flags & O_ACCMODE) == O_RDONLY)
+ return GENERIC_READ;
+ else if ((flags & O_ACCMODE) == O_WRONLY)
+ return GENERIC_WRITE;
+ else if ((flags & O_ACCMODE) == O_RDWR) {
+ /* GENERIC_ALL is too much permission to request
+ can cause unnecessary access denied on create */
+ /* return GENERIC_ALL; */
+ return (GENERIC_READ | GENERIC_WRITE);
+ }
+
+ return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
+ FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
+ FILE_READ_DATA);
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static u32 cifs_posix_convert_flags(unsigned int flags)
+{
+ u32 posix_flags = 0;
+
+ if ((flags & O_ACCMODE) == O_RDONLY)
+ posix_flags = SMB_O_RDONLY;
+ else if ((flags & O_ACCMODE) == O_WRONLY)
+ posix_flags = SMB_O_WRONLY;
+ else if ((flags & O_ACCMODE) == O_RDWR)
+ posix_flags = SMB_O_RDWR;
+
+ if (flags & O_CREAT) {
+ posix_flags |= SMB_O_CREAT;
+ if (flags & O_EXCL)
+ posix_flags |= SMB_O_EXCL;
+ } else if (flags & O_EXCL)
+ cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n",
+ current->comm, current->tgid);
+
+ if (flags & O_TRUNC)
+ posix_flags |= SMB_O_TRUNC;
+ /* be safe and imply O_SYNC for O_DSYNC */
+ if (flags & O_DSYNC)
+ posix_flags |= SMB_O_SYNC;
+ if (flags & O_DIRECTORY)
+ posix_flags |= SMB_O_DIRECTORY;
+ if (flags & O_NOFOLLOW)
+ posix_flags |= SMB_O_NOFOLLOW;
+ if (flags & O_DIRECT)
+ posix_flags |= SMB_O_DIRECT;
+
+ return posix_flags;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static inline int cifs_get_disposition(unsigned int flags)
+{
+ if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+ return FILE_CREATE;
+ else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
+ return FILE_OVERWRITE_IF;
+ else if ((flags & O_CREAT) == O_CREAT)
+ return FILE_OPEN_IF;
+ else if ((flags & O_TRUNC) == O_TRUNC)
+ return FILE_OVERWRITE;
+ else
+ return FILE_OPEN;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+int cifs_posix_open(const char *full_path, struct inode **pinode,
+ struct super_block *sb, int mode, unsigned int f_flags,
+ __u32 *poplock, __u16 *pnetfid, unsigned int xid)
+{
+ int rc;
+ FILE_UNIX_BASIC_INFO *presp_data;
+ __u32 posix_flags = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_fattr fattr;
+ struct tcon_link *tlink;
+ struct cifs_tcon *tcon;
+
+ cifs_dbg(FYI, "posix open %s\n", full_path);
+
+ presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
+ if (presp_data == NULL)
+ return -ENOMEM;
+
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ goto posix_open_ret;
+ }
+
+ tcon = tlink_tcon(tlink);
+ mode &= ~current_umask();
+
+ posix_flags = cifs_posix_convert_flags(f_flags);
+ rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
+ poplock, full_path, cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ cifs_put_tlink(tlink);
+
+ if (rc)
+ goto posix_open_ret;
+
+ if (presp_data->Type == cpu_to_le32(-1))
+ goto posix_open_ret; /* open ok, caller does qpathinfo */
+
+ if (!pinode)
+ goto posix_open_ret; /* caller does not need info */
+
+ cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
+
+ /* get new inode and set it up */
+ if (*pinode == NULL) {
+ cifs_fill_uniqueid(sb, &fattr);
+ *pinode = cifs_iget(sb, &fattr);
+ if (!*pinode) {
+ rc = -ENOMEM;
+ goto posix_open_ret;
+ }
+ } else {
+ cifs_revalidate_mapping(*pinode);
+ rc = cifs_fattr_to_inode(*pinode, &fattr);
+ }
+
+posix_open_ret:
+ kfree(presp_data);
+ return rc;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
+ struct cifs_fid *fid, unsigned int xid, struct cifs_open_info_data *buf)
+{
+ int rc;
+ int desired_access;
+ int disposition;
+ int create_options = CREATE_NOT_DIR;
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct cifs_open_parms oparms;
+
+ if (!server->ops->open)
+ return -ENOSYS;
+
+ desired_access = cifs_convert_flags(f_flags);
+
+/*********************************************************************
+ * open flag mapping table:
+ *
+ * POSIX Flag CIFS Disposition
+ * ---------- ----------------
+ * O_CREAT FILE_OPEN_IF
+ * O_CREAT | O_EXCL FILE_CREATE
+ * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
+ * O_TRUNC FILE_OVERWRITE
+ * none of the above FILE_OPEN
+ *
+ * Note that there is not a direct match between disposition
+ * FILE_SUPERSEDE (ie create whether or not file exists although
+ * O_CREAT | O_TRUNC is similar but truncates the existing
+ * file rather than creating a new file as FILE_SUPERSEDE does
+ * (which uses the attributes / metadata passed in on open call)
+ *?
+ *? O_SYNC is a reasonable match to CIFS writethrough flag
+ *? and the read write flags match reasonably. O_LARGEFILE
+ *? is irrelevant because largefile support is always used
+ *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
+ * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
+ *********************************************************************/
+
+ disposition = cifs_get_disposition(f_flags);
+
+ /* BB pass O_SYNC flag through on file attributes .. BB */
+
+ /* O_SYNC also has bit for O_DSYNC so following check picks up either */
+ if (f_flags & O_SYNC)
+ create_options |= CREATE_WRITE_THROUGH;
+
+ if (f_flags & O_DIRECT)
+ create_options |= CREATE_NO_BUFFER;
+
+ oparms = (struct cifs_open_parms) {
+ .tcon = tcon,
+ .cifs_sb = cifs_sb,
+ .desired_access = desired_access,
+ .create_options = cifs_create_options(cifs_sb, create_options),
+ .disposition = disposition,
+ .path = full_path,
+ .fid = fid,
+ };
+
+ rc = server->ops->open(xid, &oparms, oplock, buf);
+ if (rc)
+ return rc;
+
+ /* TODO: Add support for calling posix query info but with passing in fid */
+ if (tcon->unix_ext)
+ rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
+ xid);
+ else
+ rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
+ xid, fid);
+
+ if (rc) {
+ server->ops->close(xid, tcon, fid);
+ if (rc == -ESTALE)
+ rc = -EOPENSTALE;
+ }
+
+ return rc;
+}
+
+static bool
+cifs_has_mand_locks(struct cifsInodeInfo *cinode)
+{
+ struct cifs_fid_locks *cur;
+ bool has_locks = false;
+
+ down_read(&cinode->lock_sem);
+ list_for_each_entry(cur, &cinode->llist, llist) {
+ if (!list_empty(&cur->locks)) {
+ has_locks = true;
+ break;
+ }
+ }
+ up_read(&cinode->lock_sem);
+ return has_locks;
+}
+
+void
+cifs_down_write(struct rw_semaphore *sem)
+{
+ while (!down_write_trylock(sem))
+ msleep(10);
+}
+
+static void cifsFileInfo_put_work(struct work_struct *work);
+
+struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
+ struct tcon_link *tlink, __u32 oplock,
+ const char *symlink_target)
+{
+ struct dentry *dentry = file_dentry(file);
+ struct inode *inode = d_inode(dentry);
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct cifsFileInfo *cfile;
+ struct cifs_fid_locks *fdlocks;
+ struct cifs_tcon *tcon = tlink_tcon(tlink);
+ struct TCP_Server_Info *server = tcon->ses->server;
+
+ cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+ if (cfile == NULL)
+ return cfile;
+
+ fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
+ if (!fdlocks) {
+ kfree(cfile);
+ return NULL;
+ }
+
+ if (symlink_target) {
+ cfile->symlink_target = kstrdup(symlink_target, GFP_KERNEL);
+ if (!cfile->symlink_target) {
+ kfree(fdlocks);
+ kfree(cfile);
+ return NULL;
+ }
+ }
+
+ INIT_LIST_HEAD(&fdlocks->locks);
+ fdlocks->cfile = cfile;
+ cfile->llist = fdlocks;
+
+ cfile->count = 1;
+ cfile->pid = current->tgid;
+ cfile->uid = current_fsuid();
+ cfile->dentry = dget(dentry);
+ cfile->f_flags = file->f_flags;
+ cfile->invalidHandle = false;
+ cfile->deferred_close_scheduled = false;
+ cfile->tlink = cifs_get_tlink(tlink);
+ INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
+ INIT_WORK(&cfile->put, cifsFileInfo_put_work);
+ INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close);
+ mutex_init(&cfile->fh_mutex);
+ spin_lock_init(&cfile->file_info_lock);
+
+ cifs_sb_active(inode->i_sb);
+
+ /*
+ * If the server returned a read oplock and we have mandatory brlocks,
+ * set oplock level to None.
+ */
+ if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
+ cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
+ oplock = 0;
+ }
+
+ cifs_down_write(&cinode->lock_sem);
+ list_add(&fdlocks->llist, &cinode->llist);
+ up_write(&cinode->lock_sem);
+
+ spin_lock(&tcon->open_file_lock);
+ if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
+ oplock = fid->pending_open->oplock;
+ list_del(&fid->pending_open->olist);
+
+ fid->purge_cache = false;
+ server->ops->set_fid(cfile, fid, oplock);
+
+ list_add(&cfile->tlist, &tcon->openFileList);
+ atomic_inc(&tcon->num_local_opens);
+
+ /* if readable file instance put first in list*/
+ spin_lock(&cinode->open_file_lock);
+ if (file->f_mode & FMODE_READ)
+ list_add(&cfile->flist, &cinode->openFileList);
+ else
+ list_add_tail(&cfile->flist, &cinode->openFileList);
+ spin_unlock(&cinode->open_file_lock);
+ spin_unlock(&tcon->open_file_lock);
+
+ if (fid->purge_cache)
+ cifs_zap_mapping(inode);
+
+ file->private_data = cfile;
+ return cfile;
+}
+
+struct cifsFileInfo *
+cifsFileInfo_get(struct cifsFileInfo *cifs_file)
+{
+ spin_lock(&cifs_file->file_info_lock);
+ cifsFileInfo_get_locked(cifs_file);
+ spin_unlock(&cifs_file->file_info_lock);
+ return cifs_file;
+}
+
+static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file)
+{
+ struct inode *inode = d_inode(cifs_file->dentry);
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+ struct cifsLockInfo *li, *tmp;
+ struct super_block *sb = inode->i_sb;
+
+ /*
+ * Delete any outstanding lock records. We'll lose them when the file
+ * is closed anyway.
+ */
+ cifs_down_write(&cifsi->lock_sem);
+ list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
+ list_del(&li->llist);
+ cifs_del_lock_waiters(li);
+ kfree(li);
+ }
+ list_del(&cifs_file->llist->llist);
+ kfree(cifs_file->llist);
+ up_write(&cifsi->lock_sem);
+
+ cifs_put_tlink(cifs_file->tlink);
+ dput(cifs_file->dentry);
+ cifs_sb_deactive(sb);
+ kfree(cifs_file->symlink_target);
+ kfree(cifs_file);
+}
+
+static void cifsFileInfo_put_work(struct work_struct *work)
+{
+ struct cifsFileInfo *cifs_file = container_of(work,
+ struct cifsFileInfo, put);
+
+ cifsFileInfo_put_final(cifs_file);
+}
+
+/**
+ * cifsFileInfo_put - release a reference of file priv data
+ *
+ * Always potentially wait for oplock handler. See _cifsFileInfo_put().
+ *
+ * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file
+ */
+void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
+{
+ _cifsFileInfo_put(cifs_file, true, true);
+}
+
+/**
+ * _cifsFileInfo_put - release a reference of file priv data
+ *
+ * This may involve closing the filehandle @cifs_file out on the
+ * server. Must be called without holding tcon->open_file_lock,
+ * cinode->open_file_lock and cifs_file->file_info_lock.
+ *
+ * If @wait_for_oplock_handler is true and we are releasing the last
+ * reference, wait for any running oplock break handler of the file
+ * and cancel any pending one.
+ *
+ * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file
+ * @wait_oplock_handler: must be false if called from oplock_break_handler
+ * @offload: not offloaded on close and oplock breaks
+ *
+ */
+void _cifsFileInfo_put(struct cifsFileInfo *cifs_file,
+ bool wait_oplock_handler, bool offload)
+{
+ struct inode *inode = d_inode(cifs_file->dentry);
+ struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+ struct super_block *sb = inode->i_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_fid fid = {};
+ struct cifs_pending_open open;
+ bool oplock_break_cancelled;
+
+ spin_lock(&tcon->open_file_lock);
+ spin_lock(&cifsi->open_file_lock);
+ spin_lock(&cifs_file->file_info_lock);
+ if (--cifs_file->count > 0) {
+ spin_unlock(&cifs_file->file_info_lock);
+ spin_unlock(&cifsi->open_file_lock);
+ spin_unlock(&tcon->open_file_lock);
+ return;
+ }
+ spin_unlock(&cifs_file->file_info_lock);
+
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &fid);
+
+ /* store open in pending opens to make sure we don't miss lease break */
+ cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
+
+ /* remove it from the lists */
+ list_del(&cifs_file->flist);
+ list_del(&cifs_file->tlist);
+ atomic_dec(&tcon->num_local_opens);
+
+ if (list_empty(&cifsi->openFileList)) {
+ cifs_dbg(FYI, "closing last open instance for inode %p\n",
+ d_inode(cifs_file->dentry));
+ /*
+ * In strict cache mode we need invalidate mapping on the last
+ * close because it may cause a error when we open this file
+ * again and get at least level II oplock.
+ */
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
+ set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags);
+ cifs_set_oplock_level(cifsi, 0);
+ }
+
+ spin_unlock(&cifsi->open_file_lock);
+ spin_unlock(&tcon->open_file_lock);
+
+ oplock_break_cancelled = wait_oplock_handler ?
+ cancel_work_sync(&cifs_file->oplock_break) : false;
+
+ if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
+ struct TCP_Server_Info *server = tcon->ses->server;
+ unsigned int xid;
+
+ xid = get_xid();
+ if (server->ops->close_getattr)
+ server->ops->close_getattr(xid, tcon, cifs_file);
+ else if (server->ops->close)
+ server->ops->close(xid, tcon, &cifs_file->fid);
+ _free_xid(xid);
+ }
+
+ if (oplock_break_cancelled)
+ cifs_done_oplock_break(cifsi);
+
+ cifs_del_pending_open(&open);
+
+ if (offload)
+ queue_work(fileinfo_put_wq, &cifs_file->put);
+ else
+ cifsFileInfo_put_final(cifs_file);
+}
+
+int cifs_open(struct inode *inode, struct file *file)
+
+{
+ int rc = -EACCES;
+ unsigned int xid;
+ __u32 oplock;
+ struct cifs_sb_info *cifs_sb;
+ struct TCP_Server_Info *server;
+ struct cifs_tcon *tcon;
+ struct tcon_link *tlink;
+ struct cifsFileInfo *cfile = NULL;
+ void *page;
+ const char *full_path;
+ bool posix_open_ok = false;
+ struct cifs_fid fid = {};
+ struct cifs_pending_open open;
+ struct cifs_open_info_data data = {};
+
+ xid = get_xid();
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+ if (unlikely(cifs_forced_shutdown(cifs_sb))) {
+ free_xid(xid);
+ return -EIO;
+ }
+
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ free_xid(xid);
+ return PTR_ERR(tlink);
+ }
+ tcon = tlink_tcon(tlink);
+ server = tcon->ses->server;
+
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(file_dentry(file), page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ goto out;
+ }
+
+ cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
+ inode, file->f_flags, full_path);
+
+ if (file->f_flags & O_DIRECT &&
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+ file->f_op = &cifs_file_direct_nobrl_ops;
+ else
+ file->f_op = &cifs_file_direct_ops;
+ }
+
+ /* Get the cached handle as SMB2 close is deferred */
+ rc = cifs_get_readable_path(tcon, full_path, &cfile);
+ if (rc == 0) {
+ if (file->f_flags == cfile->f_flags) {
+ file->private_data = cfile;
+ spin_lock(&CIFS_I(inode)->deferred_lock);
+ cifs_del_deferred_close(cfile);
+ spin_unlock(&CIFS_I(inode)->deferred_lock);
+ goto use_cache;
+ } else {
+ _cifsFileInfo_put(cfile, true, false);
+ }
+ }
+
+ if (server->oplocks)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (!tcon->broken_posix_open && tcon->unix_ext &&
+ cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ /* can not refresh inode info since size could be stale */
+ rc = cifs_posix_open(full_path, &inode, inode->i_sb,
+ cifs_sb->ctx->file_mode /* ignored */,
+ file->f_flags, &oplock, &fid.netfid, xid);
+ if (rc == 0) {
+ cifs_dbg(FYI, "posix open succeeded\n");
+ posix_open_ok = true;
+ } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
+ if (tcon->ses->serverNOS)
+ cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n",
+ tcon->ses->ip_addr,
+ tcon->ses->serverNOS);
+ tcon->broken_posix_open = true;
+ } else if ((rc != -EIO) && (rc != -EREMOTE) &&
+ (rc != -EOPNOTSUPP)) /* path not found or net err */
+ goto out;
+ /*
+ * Else fallthrough to retry open the old way on network i/o
+ * or DFS errors.
+ */
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &fid);
+
+ cifs_add_pending_open(&fid, tlink, &open);
+
+ if (!posix_open_ok) {
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &fid);
+
+ rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags, &oplock, &fid,
+ xid, &data);
+ if (rc) {
+ cifs_del_pending_open(&open);
+ goto out;
+ }
+ }
+
+ cfile = cifs_new_fileinfo(&fid, file, tlink, oplock, data.symlink_target);
+ if (cfile == NULL) {
+ if (server->ops->close)
+ server->ops->close(xid, tcon, &fid);
+ cifs_del_pending_open(&open);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
+ /*
+ * Time to set mode which we can not set earlier due to
+ * problems creating new read-only files.
+ */
+ struct cifs_unix_set_info_args args = {
+ .mode = inode->i_mode,
+ .uid = INVALID_UID, /* no change */
+ .gid = INVALID_GID, /* no change */
+ .ctime = NO_CHANGE_64,
+ .atime = NO_CHANGE_64,
+ .mtime = NO_CHANGE_64,
+ .device = 0,
+ };
+ CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
+ cfile->pid);
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+use_cache:
+ fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
+ file->f_mode & FMODE_WRITE);
+ if (file->f_flags & O_DIRECT &&
+ (!((file->f_flags & O_ACCMODE) != O_RDONLY) ||
+ file->f_flags & O_APPEND))
+ cifs_invalidate_cache(file_inode(file),
+ FSCACHE_INVAL_DIO_WRITE);
+
+out:
+ free_dentry_path(page);
+ free_xid(xid);
+ cifs_put_tlink(tlink);
+ cifs_free_open_info(&data);
+ return rc;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+/*
+ * Try to reacquire byte range locks that were released when session
+ * to server was lost.
+ */
+static int
+cifs_relock_file(struct cifsFileInfo *cfile)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ int rc = 0;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING);
+ if (cinode->can_cache_brlcks) {
+ /* can cache locks - no need to relock */
+ up_read(&cinode->lock_sem);
+ return rc;
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ rc = cifs_push_posix_locks(cfile);
+ else
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ rc = tcon->ses->server->ops->push_mand_locks(cfile);
+
+ up_read(&cinode->lock_sem);
+ return rc;
+}
+
+static int
+cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
+{
+ int rc = -EACCES;
+ unsigned int xid;
+ __u32 oplock;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifsInodeInfo *cinode;
+ struct inode *inode;
+ void *page;
+ const char *full_path;
+ int desired_access;
+ int disposition = FILE_OPEN;
+ int create_options = CREATE_NOT_DIR;
+ struct cifs_open_parms oparms;
+
+ xid = get_xid();
+ mutex_lock(&cfile->fh_mutex);
+ if (!cfile->invalidHandle) {
+ mutex_unlock(&cfile->fh_mutex);
+ free_xid(xid);
+ return 0;
+ }
+
+ inode = d_inode(cfile->dentry);
+ cifs_sb = CIFS_SB(inode->i_sb);
+ tcon = tlink_tcon(cfile->tlink);
+ server = tcon->ses->server;
+
+ /*
+ * Can not grab rename sem here because various ops, including those
+ * that already have the rename sem can end up causing writepage to get
+ * called and if the server was down that means we end up here, and we
+ * can never tell if the caller already has the rename_sem.
+ */
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
+ mutex_unlock(&cfile->fh_mutex);
+ free_dentry_path(page);
+ free_xid(xid);
+ return PTR_ERR(full_path);
+ }
+
+ cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
+ inode, cfile->f_flags, full_path);
+
+ if (tcon->ses->server->oplocks)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (tcon->unix_ext && cap_unix(tcon->ses) &&
+ (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ /*
+ * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
+ * original open. Must mask them off for a reopen.
+ */
+ unsigned int oflags = cfile->f_flags &
+ ~(O_CREAT | O_EXCL | O_TRUNC);
+
+ rc = cifs_posix_open(full_path, NULL, inode->i_sb,
+ cifs_sb->ctx->file_mode /* ignored */,
+ oflags, &oplock, &cfile->fid.netfid, xid);
+ if (rc == 0) {
+ cifs_dbg(FYI, "posix reopen succeeded\n");
+ oparms.reconnect = true;
+ goto reopen_success;
+ }
+ /*
+ * fallthrough to retry open the old way on errors, especially
+ * in the reconnect path it is important to retry hard
+ */
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ desired_access = cifs_convert_flags(cfile->f_flags);
+
+ /* O_SYNC also has bit for O_DSYNC so following check picks up either */
+ if (cfile->f_flags & O_SYNC)
+ create_options |= CREATE_WRITE_THROUGH;
+
+ if (cfile->f_flags & O_DIRECT)
+ create_options |= CREATE_NO_BUFFER;
+
+ if (server->ops->get_lease_key)
+ server->ops->get_lease_key(inode, &cfile->fid);
+
+ oparms = (struct cifs_open_parms) {
+ .tcon = tcon,
+ .cifs_sb = cifs_sb,
+ .desired_access = desired_access,
+ .create_options = cifs_create_options(cifs_sb, create_options),
+ .disposition = disposition,
+ .path = full_path,
+ .fid = &cfile->fid,
+ .reconnect = true,
+ };
+
+ /*
+ * Can not refresh inode by passing in file_info buf to be returned by
+ * ops->open and then calling get_inode_info with returned buf since
+ * file might have write behind data that needs to be flushed and server
+ * version of file size can be stale. If we knew for sure that inode was
+ * not dirty locally we could do this.
+ */
+ rc = server->ops->open(xid, &oparms, &oplock, NULL);
+ if (rc == -ENOENT && oparms.reconnect == false) {
+ /* durable handle timeout is expired - open the file again */
+ rc = server->ops->open(xid, &oparms, &oplock, NULL);
+ /* indicate that we need to relock the file */
+ oparms.reconnect = true;
+ }
+
+ if (rc) {
+ mutex_unlock(&cfile->fh_mutex);
+ cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
+ cifs_dbg(FYI, "oplock: %d\n", oplock);
+ goto reopen_error_exit;
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+reopen_success:
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ cfile->invalidHandle = false;
+ mutex_unlock(&cfile->fh_mutex);
+ cinode = CIFS_I(inode);
+
+ if (can_flush) {
+ rc = filemap_write_and_wait(inode->i_mapping);
+ if (!is_interrupt_error(rc))
+ mapping_set_error(inode->i_mapping, rc);
+
+ if (tcon->posix_extensions)
+ rc = smb311_posix_get_inode_info(&inode, full_path, inode->i_sb, xid);
+ else if (tcon->unix_ext)
+ rc = cifs_get_inode_info_unix(&inode, full_path,
+ inode->i_sb, xid);
+ else
+ rc = cifs_get_inode_info(&inode, full_path, NULL,
+ inode->i_sb, xid, NULL);
+ }
+ /*
+ * Else we are writing out data to server already and could deadlock if
+ * we tried to flush data, and since we do not know if we have data that
+ * would invalidate the current end of file on the server we can not go
+ * to the server to get the new inode info.
+ */
+
+ /*
+ * If the server returned a read oplock and we have mandatory brlocks,
+ * set oplock level to None.
+ */
+ if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) {
+ cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
+ oplock = 0;
+ }
+
+ server->ops->set_fid(cfile, &cfile->fid, oplock);
+ if (oparms.reconnect)
+ cifs_relock_file(cfile);
+
+reopen_error_exit:
+ free_dentry_path(page);
+ free_xid(xid);
+ return rc;
+}
+
+void smb2_deferred_work_close(struct work_struct *work)
+{
+ struct cifsFileInfo *cfile = container_of(work,
+ struct cifsFileInfo, deferred.work);
+
+ spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
+ cifs_del_deferred_close(cfile);
+ cfile->deferred_close_scheduled = false;
+ spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock);
+ _cifsFileInfo_put(cfile, true, false);
+}
+
+int cifs_close(struct inode *inode, struct file *file)
+{
+ struct cifsFileInfo *cfile;
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_deferred_close *dclose;
+
+ cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE);
+
+ if (file->private_data != NULL) {
+ cfile = file->private_data;
+ file->private_data = NULL;
+ dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL);
+ if ((cinode->oplock == CIFS_CACHE_RHW_FLG) &&
+ cinode->lease_granted &&
+ !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) &&
+ dclose) {
+ if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) {
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ }
+ spin_lock(&cinode->deferred_lock);
+ cifs_add_deferred_close(cfile, dclose);
+ if (cfile->deferred_close_scheduled &&
+ delayed_work_pending(&cfile->deferred)) {
+ /*
+ * If there is no pending work, mod_delayed_work queues new work.
+ * So, Increase the ref count to avoid use-after-free.
+ */
+ if (!mod_delayed_work(deferredclose_wq,
+ &cfile->deferred, cifs_sb->ctx->closetimeo))
+ cifsFileInfo_get(cfile);
+ } else {
+ /* Deferred close for files */
+ queue_delayed_work(deferredclose_wq,
+ &cfile->deferred, cifs_sb->ctx->closetimeo);
+ cfile->deferred_close_scheduled = true;
+ spin_unlock(&cinode->deferred_lock);
+ return 0;
+ }
+ spin_unlock(&cinode->deferred_lock);
+ _cifsFileInfo_put(cfile, true, false);
+ } else {
+ _cifsFileInfo_put(cfile, true, false);
+ kfree(dclose);
+ }
+ }
+
+ /* return code from the ->release op is always ignored */
+ return 0;
+}
+
+void
+cifs_reopen_persistent_handles(struct cifs_tcon *tcon)
+{
+ struct cifsFileInfo *open_file, *tmp;
+ struct list_head tmp_list;
+
+ if (!tcon->use_persistent || !tcon->need_reopen_files)
+ return;
+
+ tcon->need_reopen_files = false;
+
+ cifs_dbg(FYI, "Reopen persistent handles\n");
+ INIT_LIST_HEAD(&tmp_list);
+
+ /* list all files open on tree connection, reopen resilient handles */
+ spin_lock(&tcon->open_file_lock);
+ list_for_each_entry(open_file, &tcon->openFileList, tlist) {
+ if (!open_file->invalidHandle)
+ continue;
+ cifsFileInfo_get(open_file);
+ list_add_tail(&open_file->rlist, &tmp_list);
+ }
+ spin_unlock(&tcon->open_file_lock);
+
+ list_for_each_entry_safe(open_file, tmp, &tmp_list, rlist) {
+ if (cifs_reopen_file(open_file, false /* do not flush */))
+ tcon->need_reopen_files = true;
+ list_del_init(&open_file->rlist);
+ cifsFileInfo_put(open_file);
+ }
+}
+
+int cifs_closedir(struct inode *inode, struct file *file)
+{
+ int rc = 0;
+ unsigned int xid;
+ struct cifsFileInfo *cfile = file->private_data;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ char *buf;
+
+ cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode);
+
+ if (cfile == NULL)
+ return rc;
+
+ xid = get_xid();
+ tcon = tlink_tcon(cfile->tlink);
+ server = tcon->ses->server;
+
+ cifs_dbg(FYI, "Freeing private data in close dir\n");
+ spin_lock(&cfile->file_info_lock);
+ if (server->ops->dir_needs_close(cfile)) {
+ cfile->invalidHandle = true;
+ spin_unlock(&cfile->file_info_lock);
+ if (server->ops->close_dir)
+ rc = server->ops->close_dir(xid, tcon, &cfile->fid);
+ else
+ rc = -ENOSYS;
+ cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc);
+ /* not much we can do if it fails anyway, ignore rc */
+ rc = 0;
+ } else
+ spin_unlock(&cfile->file_info_lock);
+
+ buf = cfile->srch_inf.ntwrk_buf_start;
+ if (buf) {
+ cifs_dbg(FYI, "closedir free smb buf in srch struct\n");
+ cfile->srch_inf.ntwrk_buf_start = NULL;
+ if (cfile->srch_inf.smallBuf)
+ cifs_small_buf_release(buf);
+ else
+ cifs_buf_release(buf);
+ }
+
+ cifs_put_tlink(cfile->tlink);
+ kfree(file->private_data);
+ file->private_data = NULL;
+ /* BB can we lock the filestruct while this is going on? */
+ free_xid(xid);
+ return rc;
+}
+
+static struct cifsLockInfo *
+cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 flags)
+{
+ struct cifsLockInfo *lock =
+ kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
+ if (!lock)
+ return lock;
+ lock->offset = offset;
+ lock->length = length;
+ lock->type = type;
+ lock->pid = current->tgid;
+ lock->flags = flags;
+ INIT_LIST_HEAD(&lock->blist);
+ init_waitqueue_head(&lock->block_q);
+ return lock;
+}
+
+void
+cifs_del_lock_waiters(struct cifsLockInfo *lock)
+{
+ struct cifsLockInfo *li, *tmp;
+ list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
+ list_del_init(&li->blist);
+ wake_up(&li->block_q);
+ }
+}
+
+#define CIFS_LOCK_OP 0
+#define CIFS_READ_OP 1
+#define CIFS_WRITE_OP 2
+
+/* @rw_check : 0 - no op, 1 - read, 2 - write */
+static bool
+cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
+ __u64 length, __u8 type, __u16 flags,
+ struct cifsFileInfo *cfile,
+ struct cifsLockInfo **conf_lock, int rw_check)
+{
+ struct cifsLockInfo *li;
+ struct cifsFileInfo *cur_cfile = fdlocks->cfile;
+ struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
+
+ list_for_each_entry(li, &fdlocks->locks, llist) {
+ if (offset + length <= li->offset ||
+ offset >= li->offset + li->length)
+ continue;
+ if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
+ server->ops->compare_fids(cfile, cur_cfile)) {
+ /* shared lock prevents write op through the same fid */
+ if (!(li->type & server->vals->shared_lock_type) ||
+ rw_check != CIFS_WRITE_OP)
+ continue;
+ }
+ if ((type & server->vals->shared_lock_type) &&
+ ((server->ops->compare_fids(cfile, cur_cfile) &&
+ current->tgid == li->pid) || type == li->type))
+ continue;
+ if (rw_check == CIFS_LOCK_OP &&
+ (flags & FL_OFDLCK) && (li->flags & FL_OFDLCK) &&
+ server->ops->compare_fids(cfile, cur_cfile))
+ continue;
+ if (conf_lock)
+ *conf_lock = li;
+ return true;
+ }
+ return false;
+}
+
+bool
+cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
+ __u8 type, __u16 flags,
+ struct cifsLockInfo **conf_lock, int rw_check)
+{
+ bool rc = false;
+ struct cifs_fid_locks *cur;
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+
+ list_for_each_entry(cur, &cinode->llist, llist) {
+ rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
+ flags, cfile, conf_lock,
+ rw_check);
+ if (rc)
+ break;
+ }
+
+ return rc;
+}
+
+/*
+ * Check if there is another lock that prevents us to set the lock (mandatory
+ * style). If such a lock exists, update the flock structure with its
+ * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
+ * or leave it the same if we can't. Returns 0 if we don't need to request to
+ * the server or 1 otherwise.
+ */
+static int
+cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
+ __u8 type, struct file_lock *flock)
+{
+ int rc = 0;
+ struct cifsLockInfo *conf_lock;
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
+ bool exist;
+
+ down_read(&cinode->lock_sem);
+
+ exist = cifs_find_lock_conflict(cfile, offset, length, type,
+ flock->fl_flags, &conf_lock,
+ CIFS_LOCK_OP);
+ if (exist) {
+ flock->fl_start = conf_lock->offset;
+ flock->fl_end = conf_lock->offset + conf_lock->length - 1;
+ flock->fl_pid = conf_lock->pid;
+ if (conf_lock->type & server->vals->shared_lock_type)
+ flock->fl_type = F_RDLCK;
+ else
+ flock->fl_type = F_WRLCK;
+ } else if (!cinode->can_cache_brlcks)
+ rc = 1;
+ else
+ flock->fl_type = F_UNLCK;
+
+ up_read(&cinode->lock_sem);
+ return rc;
+}
+
+static void
+cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ cifs_down_write(&cinode->lock_sem);
+ list_add_tail(&lock->llist, &cfile->llist->locks);
+ up_write(&cinode->lock_sem);
+}
+
+/*
+ * Set the byte-range lock (mandatory style). Returns:
+ * 1) 0, if we set the lock and don't need to request to the server;
+ * 2) 1, if no locks prevent us but we need to request to the server;
+ * 3) -EACCES, if there is a lock that prevents us and wait is false.
+ */
+static int
+cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
+ bool wait)
+{
+ struct cifsLockInfo *conf_lock;
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ bool exist;
+ int rc = 0;
+
+try_again:
+ exist = false;
+ cifs_down_write(&cinode->lock_sem);
+
+ exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
+ lock->type, lock->flags, &conf_lock,
+ CIFS_LOCK_OP);
+ if (!exist && cinode->can_cache_brlcks) {
+ list_add_tail(&lock->llist, &cfile->llist->locks);
+ up_write(&cinode->lock_sem);
+ return rc;
+ }
+
+ if (!exist)
+ rc = 1;
+ else if (!wait)
+ rc = -EACCES;
+ else {
+ list_add_tail(&lock->blist, &conf_lock->blist);
+ up_write(&cinode->lock_sem);
+ rc = wait_event_interruptible(lock->block_q,
+ (lock->blist.prev == &lock->blist) &&
+ (lock->blist.next == &lock->blist));
+ if (!rc)
+ goto try_again;
+ cifs_down_write(&cinode->lock_sem);
+ list_del_init(&lock->blist);
+ }
+
+ up_write(&cinode->lock_sem);
+ return rc;
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+/*
+ * Check if there is another lock that prevents us to set the lock (posix
+ * style). If such a lock exists, update the flock structure with its
+ * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
+ * or leave it the same if we can't. Returns 0 if we don't need to request to
+ * the server or 1 otherwise.
+ */
+static int
+cifs_posix_lock_test(struct file *file, struct file_lock *flock)
+{
+ int rc = 0;
+ struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
+ unsigned char saved_type = flock->fl_type;
+
+ if ((flock->fl_flags & FL_POSIX) == 0)
+ return 1;
+
+ down_read(&cinode->lock_sem);
+ posix_test_lock(file, flock);
+
+ if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
+ flock->fl_type = saved_type;
+ rc = 1;
+ }
+
+ up_read(&cinode->lock_sem);
+ return rc;
+}
+
+/*
+ * Set the byte-range lock (posix style). Returns:
+ * 1) <0, if the error occurs while setting the lock;
+ * 2) 0, if we set the lock and don't need to request to the server;
+ * 3) FILE_LOCK_DEFERRED, if we will wait for some other file_lock;
+ * 4) FILE_LOCK_DEFERRED + 1, if we need to request to the server.
+ */
+static int
+cifs_posix_lock_set(struct file *file, struct file_lock *flock)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
+ int rc = FILE_LOCK_DEFERRED + 1;
+
+ if ((flock->fl_flags & FL_POSIX) == 0)
+ return rc;
+
+ cifs_down_write(&cinode->lock_sem);
+ if (!cinode->can_cache_brlcks) {
+ up_write(&cinode->lock_sem);
+ return rc;
+ }
+
+ rc = posix_lock_file(file, flock, NULL);
+ up_write(&cinode->lock_sem);
+ return rc;
+}
+
+int
+cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
+{
+ unsigned int xid;
+ int rc = 0, stored_rc;
+ struct cifsLockInfo *li, *tmp;
+ struct cifs_tcon *tcon;
+ unsigned int num, max_num, max_buf;
+ LOCKING_ANDX_RANGE *buf, *cur;
+ static const int types[] = {
+ LOCKING_ANDX_LARGE_FILES,
+ LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
+ };
+ int i;
+
+ xid = get_xid();
+ tcon = tlink_tcon(cfile->tlink);
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it before using.
+ */
+ max_buf = tcon->ses->server->maxBuf;
+ if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) {
+ free_xid(xid);
+ return -EINVAL;
+ }
+
+ BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
+ PAGE_SIZE);
+ max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
+ PAGE_SIZE);
+ max_num = (max_buf - sizeof(struct smb_hdr)) /
+ sizeof(LOCKING_ANDX_RANGE);
+ buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
+ if (!buf) {
+ free_xid(xid);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < 2; i++) {
+ cur = buf;
+ num = 0;
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
+ if (li->type != types[i])
+ continue;
+ cur->Pid = cpu_to_le16(li->pid);
+ cur->LengthLow = cpu_to_le32((u32)li->length);
+ cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
+ cur->OffsetLow = cpu_to_le32((u32)li->offset);
+ cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
+ if (++num == max_num) {
+ stored_rc = cifs_lockv(xid, tcon,
+ cfile->fid.netfid,
+ (__u8)li->type, 0, num,
+ buf);
+ if (stored_rc)
+ rc = stored_rc;
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+
+ if (num) {
+ stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
+ (__u8)types[i], 0, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+ }
+
+ kfree(buf);
+ free_xid(xid);
+ return rc;
+}
+
+static __u32
+hash_lockowner(fl_owner_t owner)
+{
+ return cifs_lock_secret ^ hash32_ptr((const void *)owner);
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+struct lock_to_push {
+ struct list_head llist;
+ __u64 offset;
+ __u64 length;
+ __u32 pid;
+ __u16 netfid;
+ __u8 type;
+};
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+static int
+cifs_push_posix_locks(struct cifsFileInfo *cfile)
+{
+ struct inode *inode = d_inode(cfile->dentry);
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct file_lock *flock;
+ struct file_lock_context *flctx = locks_inode_context(inode);
+ unsigned int count = 0, i;
+ int rc = 0, xid, type;
+ struct list_head locks_to_send, *el;
+ struct lock_to_push *lck, *tmp;
+ __u64 length;
+
+ xid = get_xid();
+
+ if (!flctx)
+ goto out;
+
+ spin_lock(&flctx->flc_lock);
+ list_for_each(el, &flctx->flc_posix) {
+ count++;
+ }
+ spin_unlock(&flctx->flc_lock);
+
+ INIT_LIST_HEAD(&locks_to_send);
+
+ /*
+ * Allocating count locks is enough because no FL_POSIX locks can be
+ * added to the list while we are holding cinode->lock_sem that
+ * protects locking operations of this inode.
+ */
+ for (i = 0; i < count; i++) {
+ lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
+ if (!lck) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ list_add_tail(&lck->llist, &locks_to_send);
+ }
+
+ el = locks_to_send.next;
+ spin_lock(&flctx->flc_lock);
+ list_for_each_entry(flock, &flctx->flc_posix, fl_list) {
+ if (el == &locks_to_send) {
+ /*
+ * The list ended. We don't have enough allocated
+ * structures - something is really wrong.
+ */
+ cifs_dbg(VFS, "Can't push all brlocks!\n");
+ break;
+ }
+ length = cifs_flock_len(flock);
+ if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
+ type = CIFS_RDLCK;
+ else
+ type = CIFS_WRLCK;
+ lck = list_entry(el, struct lock_to_push, llist);
+ lck->pid = hash_lockowner(flock->fl_owner);
+ lck->netfid = cfile->fid.netfid;
+ lck->length = length;
+ lck->type = type;
+ lck->offset = flock->fl_start;
+ }
+ spin_unlock(&flctx->flc_lock);
+
+ list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
+ int stored_rc;
+
+ stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
+ lck->offset, lck->length, NULL,
+ lck->type, 0);
+ if (stored_rc)
+ rc = stored_rc;
+ list_del(&lck->llist);
+ kfree(lck);
+ }
+
+out:
+ free_xid(xid);
+ return rc;
+err_out:
+ list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
+ list_del(&lck->llist);
+ kfree(lck);
+ }
+ goto out;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static int
+cifs_push_locks(struct cifsFileInfo *cfile)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ int rc = 0;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ /* we are going to update can_cache_brlcks here - need a write access */
+ cifs_down_write(&cinode->lock_sem);
+ if (!cinode->can_cache_brlcks) {
+ up_write(&cinode->lock_sem);
+ return rc;
+ }
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ rc = cifs_push_posix_locks(cfile);
+ else
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ rc = tcon->ses->server->ops->push_mand_locks(cfile);
+
+ cinode->can_cache_brlcks = false;
+ up_write(&cinode->lock_sem);
+ return rc;
+}
+
+static void
+cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
+ bool *wait_flag, struct TCP_Server_Info *server)
+{
+ if (flock->fl_flags & FL_POSIX)
+ cifs_dbg(FYI, "Posix\n");
+ if (flock->fl_flags & FL_FLOCK)
+ cifs_dbg(FYI, "Flock\n");
+ if (flock->fl_flags & FL_SLEEP) {
+ cifs_dbg(FYI, "Blocking lock\n");
+ *wait_flag = true;
+ }
+ if (flock->fl_flags & FL_ACCESS)
+ cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n");
+ if (flock->fl_flags & FL_LEASE)
+ cifs_dbg(FYI, "Lease on file - not implemented yet\n");
+ if (flock->fl_flags &
+ (~(FL_POSIX | FL_FLOCK | FL_SLEEP |
+ FL_ACCESS | FL_LEASE | FL_CLOSE | FL_OFDLCK)))
+ cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags);
+
+ *type = server->vals->large_lock_type;
+ if (flock->fl_type == F_WRLCK) {
+ cifs_dbg(FYI, "F_WRLCK\n");
+ *type |= server->vals->exclusive_lock_type;
+ *lock = 1;
+ } else if (flock->fl_type == F_UNLCK) {
+ cifs_dbg(FYI, "F_UNLCK\n");
+ *type |= server->vals->unlock_lock_type;
+ *unlock = 1;
+ /* Check if unlock includes more than one lock range */
+ } else if (flock->fl_type == F_RDLCK) {
+ cifs_dbg(FYI, "F_RDLCK\n");
+ *type |= server->vals->shared_lock_type;
+ *lock = 1;
+ } else if (flock->fl_type == F_EXLCK) {
+ cifs_dbg(FYI, "F_EXLCK\n");
+ *type |= server->vals->exclusive_lock_type;
+ *lock = 1;
+ } else if (flock->fl_type == F_SHLCK) {
+ cifs_dbg(FYI, "F_SHLCK\n");
+ *type |= server->vals->shared_lock_type;
+ *lock = 1;
+ } else
+ cifs_dbg(FYI, "Unknown type of lock\n");
+}
+
+static int
+cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
+ bool wait_flag, bool posix_lck, unsigned int xid)
+{
+ int rc = 0;
+ __u64 length = cifs_flock_len(flock);
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct TCP_Server_Info *server = tcon->ses->server;
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ __u16 netfid = cfile->fid.netfid;
+
+ if (posix_lck) {
+ int posix_lock_type;
+
+ rc = cifs_posix_lock_test(file, flock);
+ if (!rc)
+ return rc;
+
+ if (type & server->vals->shared_lock_type)
+ posix_lock_type = CIFS_RDLCK;
+ else
+ posix_lock_type = CIFS_WRLCK;
+ rc = CIFSSMBPosixLock(xid, tcon, netfid,
+ hash_lockowner(flock->fl_owner),
+ flock->fl_start, length, flock,
+ posix_lock_type, wait_flag);
+ return rc;
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+ rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
+ if (!rc)
+ return rc;
+
+ /* BB we could chain these into one lock request BB */
+ rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type,
+ 1, 0, false);
+ if (rc == 0) {
+ rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
+ type, 0, 1, false);
+ flock->fl_type = F_UNLCK;
+ if (rc != 0)
+ cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
+ rc);
+ return 0;
+ }
+
+ if (type & server->vals->shared_lock_type) {
+ flock->fl_type = F_WRLCK;
+ return 0;
+ }
+
+ type &= ~server->vals->exclusive_lock_type;
+
+ rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
+ type | server->vals->shared_lock_type,
+ 1, 0, false);
+ if (rc == 0) {
+ rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
+ type | server->vals->shared_lock_type, 0, 1, false);
+ flock->fl_type = F_RDLCK;
+ if (rc != 0)
+ cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
+ rc);
+ } else
+ flock->fl_type = F_WRLCK;
+
+ return 0;
+}
+
+void
+cifs_move_llist(struct list_head *source, struct list_head *dest)
+{
+ struct list_head *li, *tmp;
+ list_for_each_safe(li, tmp, source)
+ list_move(li, dest);
+}
+
+void
+cifs_free_llist(struct list_head *llist)
+{
+ struct cifsLockInfo *li, *tmp;
+ list_for_each_entry_safe(li, tmp, llist, llist) {
+ cifs_del_lock_waiters(li);
+ list_del(&li->llist);
+ kfree(li);
+ }
+}
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+int
+cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
+ unsigned int xid)
+{
+ int rc = 0, stored_rc;
+ static const int types[] = {
+ LOCKING_ANDX_LARGE_FILES,
+ LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
+ };
+ unsigned int i;
+ unsigned int max_num, num, max_buf;
+ LOCKING_ANDX_RANGE *buf, *cur;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
+ struct cifsLockInfo *li, *tmp;
+ __u64 length = cifs_flock_len(flock);
+ struct list_head tmp_llist;
+
+ INIT_LIST_HEAD(&tmp_llist);
+
+ /*
+ * Accessing maxBuf is racy with cifs_reconnect - need to store value
+ * and check it before using.
+ */
+ max_buf = tcon->ses->server->maxBuf;
+ if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE)))
+ return -EINVAL;
+
+ BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) >
+ PAGE_SIZE);
+ max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr),
+ PAGE_SIZE);
+ max_num = (max_buf - sizeof(struct smb_hdr)) /
+ sizeof(LOCKING_ANDX_RANGE);
+ buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ cifs_down_write(&cinode->lock_sem);
+ for (i = 0; i < 2; i++) {
+ cur = buf;
+ num = 0;
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
+ if (flock->fl_start > li->offset ||
+ (flock->fl_start + length) <
+ (li->offset + li->length))
+ continue;
+ if (current->tgid != li->pid)
+ continue;
+ if (types[i] != li->type)
+ continue;
+ if (cinode->can_cache_brlcks) {
+ /*
+ * We can cache brlock requests - simply remove
+ * a lock from the file's list.
+ */
+ list_del(&li->llist);
+ cifs_del_lock_waiters(li);
+ kfree(li);
+ continue;
+ }
+ cur->Pid = cpu_to_le16(li->pid);
+ cur->LengthLow = cpu_to_le32((u32)li->length);
+ cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
+ cur->OffsetLow = cpu_to_le32((u32)li->offset);
+ cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
+ /*
+ * We need to save a lock here to let us add it again to
+ * the file's list if the unlock range request fails on
+ * the server.
+ */
+ list_move(&li->llist, &tmp_llist);
+ if (++num == max_num) {
+ stored_rc = cifs_lockv(xid, tcon,
+ cfile->fid.netfid,
+ li->type, num, 0, buf);
+ if (stored_rc) {
+ /*
+ * We failed on the unlock range
+ * request - add all locks from the tmp
+ * list to the head of the file's list.
+ */
+ cifs_move_llist(&tmp_llist,
+ &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ /*
+ * The unlock range request succeed -
+ * free the tmp list.
+ */
+ cifs_free_llist(&tmp_llist);
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+ if (num) {
+ stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
+ types[i], num, 0, buf);
+ if (stored_rc) {
+ cifs_move_llist(&tmp_llist,
+ &cfile->llist->locks);
+ rc = stored_rc;
+ } else
+ cifs_free_llist(&tmp_llist);
+ }
+ }
+
+ up_write(&cinode->lock_sem);
+ kfree(buf);
+ return rc;
+}
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+
+static int
+cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
+ bool wait_flag, bool posix_lck, int lock, int unlock,
+ unsigned int xid)
+{
+ int rc = 0;
+ __u64 length = cifs_flock_len(flock);
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ struct inode *inode = d_inode(cfile->dentry);
+
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
+ if (posix_lck) {
+ int posix_lock_type;
+
+ rc = cifs_posix_lock_set(file, flock);
+ if (rc <= FILE_LOCK_DEFERRED)
+ return rc;
+
+ if (type & server->vals->shared_lock_type)
+ posix_lock_type = CIFS_RDLCK;
+ else
+ posix_lock_type = CIFS_WRLCK;
+
+ if (unlock == 1)
+ posix_lock_type = CIFS_UNLCK;
+
+ rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
+ hash_lockowner(flock->fl_owner),
+ flock->fl_start, length,
+ NULL, posix_lock_type, wait_flag);
+ goto out;
+ }
+#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
+ if (lock) {
+ struct cifsLockInfo *lock;
+
+ lock = cifs_lock_init(flock->fl_start, length, type,
+ flock->fl_flags);
+ if (!lock)
+ return -ENOMEM;
+
+ rc = cifs_lock_add_if(cfile, lock, wait_flag);
+ if (rc < 0) {
+ kfree(lock);
+ return rc;
+ }
+ if (!rc)
+ goto out;
+
+ /*
+ * Windows 7 server can delay breaking lease from read to None
+ * if we set a byte-range lock on a file - break it explicitly
+ * before sending the lock to the server to be sure the next
+ * read won't conflict with non-overlapted locks due to
+ * pagereading.
+ */
+ if (!CIFS_CACHE_WRITE(CIFS_I(inode)) &&
+ CIFS_CACHE_READ(CIFS_I(inode))) {
+ cifs_zap_mapping(inode);
+ cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n",
+ inode);
+ CIFS_I(inode)->oplock = 0;
+ }
+
+ rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
+ type, 1, 0, wait_flag);
+ if (rc) {
+ kfree(lock);
+ return rc;
+ }
+
+ cifs_lock_add(cfile, lock);
+ } else if (unlock)
+ rc = server->ops->mand_unlock_range(cfile, flock, xid);
+
+out:
+ if ((flock->fl_flags & FL_POSIX) || (flock->fl_flags & FL_FLOCK)) {
+ /*
+ * If this is a request to remove all locks because we
+ * are closing the file, it doesn't matter if the
+ * unlocking failed as both cifs.ko and the SMB server
+ * remove the lock on file close
+ */
+ if (rc) {
+ cifs_dbg(VFS, "%s failed rc=%d\n", __func__, rc);
+ if (!(flock->fl_flags & FL_CLOSE))
+ return rc;
+ }
+ rc = locks_lock_file_wait(file, flock);
+ }
+ return rc;
+}
+
+int cifs_flock(struct file *file, int cmd, struct file_lock *fl)
+{
+ int rc, xid;
+ int lock = 0, unlock = 0;
+ bool wait_flag = false;
+ bool posix_lck = false;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct cifsFileInfo *cfile;
+ __u32 type;
+
+ xid = get_xid();
+
+ if (!(fl->fl_flags & FL_FLOCK)) {
+ rc = -ENOLCK;
+ free_xid(xid);
+ return rc;
+ }
+
+ cfile = (struct cifsFileInfo *)file->private_data;
+ tcon = tlink_tcon(cfile->tlink);
+
+ cifs_read_flock(fl, &type, &lock, &unlock, &wait_flag,
+ tcon->ses->server);
+ cifs_sb = CIFS_FILE_SB(file);
+
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ posix_lck = true;
+
+ if (!lock && !unlock) {
+ /*
+ * if no lock or unlock then nothing to do since we do not
+ * know what it is
+ */
+ rc = -EOPNOTSUPP;
+ free_xid(xid);
+ return rc;
+ }
+
+ rc = cifs_setlk(file, fl, type, wait_flag, posix_lck, lock, unlock,
+ xid);
+ free_xid(xid);
+ return rc;
+
+
+}
+
+int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
+{
+ int rc, xid;
+ int lock = 0, unlock = 0;
+ bool wait_flag = false;
+ bool posix_lck = false;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct cifsFileInfo *cfile;
+ __u32 type;
+
+ rc = -EACCES;
+ xid = get_xid();
+
+ cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd,
+ flock->fl_flags, flock->fl_type, (long long)flock->fl_start,
+ (long long)flock->fl_end);
+
+ cfile = (struct cifsFileInfo *)file->private_data;
+ tcon = tlink_tcon(cfile->tlink);
+
+ cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
+ tcon->ses->server);
+ cifs_sb = CIFS_FILE_SB(file);
+ set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags);
+
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ posix_lck = true;
+ /*
+ * BB add code here to normalize offset and length to account for
+ * negative length which we can not accept over the wire.
+ */
+ if (IS_GETLK(cmd)) {
+ rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
+ free_xid(xid);
+ return rc;
+ }
+
+ if (!lock && !unlock) {
+ /*
+ * if no lock or unlock then nothing to do since we do not
+ * know what it is
+ */
+ free_xid(xid);
+ return -EOPNOTSUPP;
+ }
+
+ rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
+ xid);
+ free_xid(xid);
+ return rc;
+}
+
+/*
+ * update the file size (if needed) after a write. Should be called with
+ * the inode->i_lock held
+ */
+void
+cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
+ unsigned int bytes_written)
+{
+ loff_t end_of_write = offset + bytes_written;
+
+ if (end_of_write > cifsi->server_eof)
+ cifsi->server_eof = end_of_write;
+}
+
+static ssize_t
+cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data,
+ size_t write_size, loff_t *offset)
+{
+ int rc = 0;
+ unsigned int bytes_written = 0;
+ unsigned int total_written;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ unsigned int xid;
+ struct dentry *dentry = open_file->dentry;
+ struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry));
+ struct cifs_io_parms io_parms = {0};
+
+ cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n",
+ write_size, *offset, dentry);
+
+ tcon = tlink_tcon(open_file->tlink);
+ server = tcon->ses->server;
+
+ if (!server->ops->sync_write)
+ return -ENOSYS;
+
+ xid = get_xid();
+
+ for (total_written = 0; write_size > total_written;
+ total_written += bytes_written) {
+ rc = -EAGAIN;
+ while (rc == -EAGAIN) {
+ struct kvec iov[2];
+ unsigned int len;
+
+ if (open_file->invalidHandle) {
+ /* we could deadlock if we called
+ filemap_fdatawait from here so tell
+ reopen_file not to flush data to
+ server now */
+ rc = cifs_reopen_file(open_file, false);
+ if (rc != 0)
+ break;
+ }
+
+ len = min(server->ops->wp_retry_size(d_inode(dentry)),
+ (unsigned int)write_size - total_written);
+ /* iov[0] is reserved for smb header */
+ iov[1].iov_base = (char *)write_data + total_written;
+ iov[1].iov_len = len;
+ io_parms.pid = pid;
+ io_parms.tcon = tcon;
+ io_parms.offset = *offset;
+ io_parms.length = len;
+ rc = server->ops->sync_write(xid, &open_file->fid,
+ &io_parms, &bytes_written, iov, 1);
+ }
+ if (rc || (bytes_written == 0)) {
+ if (total_written)
+ break;
+ else {
+ free_xid(xid);
+ return rc;
+ }
+ } else {
+ spin_lock(&d_inode(dentry)->i_lock);
+ cifs_update_eof(cifsi, *offset, bytes_written);
+ spin_unlock(&d_inode(dentry)->i_lock);
+ *offset += bytes_written;
+ }
+ }
+
+ cifs_stats_bytes_written(tcon, total_written);
+
+ if (total_written > 0) {
+ spin_lock(&d_inode(dentry)->i_lock);
+ if (*offset > d_inode(dentry)->i_size) {
+ i_size_write(d_inode(dentry), *offset);
+ d_inode(dentry)->i_blocks = (512 - 1 + *offset) >> 9;
+ }
+ spin_unlock(&d_inode(dentry)->i_lock);
+ }
+ mark_inode_dirty_sync(d_inode(dentry));
+ free_xid(xid);
+ return total_written;
+}
+
+struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
+ bool fsuid_only)
+{
+ struct cifsFileInfo *open_file = NULL;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb);
+
+ /* only filter by fsuid on multiuser mounts */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+ fsuid_only = false;
+
+ spin_lock(&cifs_inode->open_file_lock);
+ /* we could simply get the first_list_entry since write-only entries
+ are always at the end of the list but since the first entry might
+ have a close pending, we go through the whole list */
+ list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
+ if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
+ continue;
+ if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
+ if ((!open_file->invalidHandle)) {
+ /* found a good file */
+ /* lock it so it will not be closed on us */
+ cifsFileInfo_get(open_file);
+ spin_unlock(&cifs_inode->open_file_lock);
+ return open_file;
+ } /* else might as well continue, and look for
+ another, or simply have the caller reopen it
+ again rather than trying to fix this handle */
+ } else /* write only file */
+ break; /* write only files are last so must be done */
+ }
+ spin_unlock(&cifs_inode->open_file_lock);
+ return NULL;
+}
+
+/* Return -EBADF if no handle is found and general rc otherwise */
+int
+cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, int flags,
+ struct cifsFileInfo **ret_file)
+{
+ struct cifsFileInfo *open_file, *inv_file = NULL;
+ struct cifs_sb_info *cifs_sb;
+ bool any_available = false;
+ int rc = -EBADF;
+ unsigned int refind = 0;
+ bool fsuid_only = flags & FIND_WR_FSUID_ONLY;
+ bool with_delete = flags & FIND_WR_WITH_DELETE;
+ *ret_file = NULL;
+
+ /*
+ * Having a null inode here (because mapping->host was set to zero by
+ * the VFS or MM) should not happen but we had reports of on oops (due
+ * to it being zero) during stress testcases so we need to check for it
+ */
+
+ if (cifs_inode == NULL) {
+ cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
+ dump_stack();
+ return rc;
+ }
+
+ cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb);
+
+ /* only filter by fsuid on multiuser mounts */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+ fsuid_only = false;
+
+ spin_lock(&cifs_inode->open_file_lock);
+refind_writable:
+ if (refind > MAX_REOPEN_ATT) {
+ spin_unlock(&cifs_inode->open_file_lock);
+ return rc;
+ }
+ list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
+ if (!any_available && open_file->pid != current->tgid)
+ continue;
+ if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
+ continue;
+ if (with_delete && !(open_file->fid.access & DELETE))
+ continue;
+ if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
+ if (!open_file->invalidHandle) {
+ /* found a good writable file */
+ cifsFileInfo_get(open_file);
+ spin_unlock(&cifs_inode->open_file_lock);
+ *ret_file = open_file;
+ return 0;
+ } else {
+ if (!inv_file)
+ inv_file = open_file;
+ }
+ }
+ }
+ /* couldn't find useable FH with same pid, try any available */
+ if (!any_available) {
+ any_available = true;
+ goto refind_writable;
+ }
+
+ if (inv_file) {
+ any_available = false;
+ cifsFileInfo_get(inv_file);
+ }
+
+ spin_unlock(&cifs_inode->open_file_lock);
+
+ if (inv_file) {
+ rc = cifs_reopen_file(inv_file, false);
+ if (!rc) {
+ *ret_file = inv_file;
+ return 0;
+ }
+
+ spin_lock(&cifs_inode->open_file_lock);
+ list_move_tail(&inv_file->flist, &cifs_inode->openFileList);
+ spin_unlock(&cifs_inode->open_file_lock);
+ cifsFileInfo_put(inv_file);
+ ++refind;
+ inv_file = NULL;
+ spin_lock(&cifs_inode->open_file_lock);
+ goto refind_writable;
+ }
+
+ return rc;
+}
+
+struct cifsFileInfo *
+find_writable_file(struct cifsInodeInfo *cifs_inode, int flags)
+{
+ struct cifsFileInfo *cfile;
+ int rc;
+
+ rc = cifs_get_writable_file(cifs_inode, flags, &cfile);
+ if (rc)
+ cifs_dbg(FYI, "Couldn't find writable handle rc=%d\n", rc);
+
+ return cfile;
+}
+
+int
+cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
+ int flags,
+ struct cifsFileInfo **ret_file)
+{
+ struct cifsFileInfo *cfile;
+ void *page = alloc_dentry_path();
+
+ *ret_file = NULL;
+
+ spin_lock(&tcon->open_file_lock);
+ list_for_each_entry(cfile, &tcon->openFileList, tlist) {
+ struct cifsInodeInfo *cinode;
+ const char *full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
+ }
+ if (strcmp(full_path, name))
+ continue;
+
+ cinode = CIFS_I(d_inode(cfile->dentry));
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ return cifs_get_writable_file(cinode, flags, ret_file);
+ }
+
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ return -ENOENT;
+}
+
+int
+cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
+ struct cifsFileInfo **ret_file)
+{
+ struct cifsFileInfo *cfile;
+ void *page = alloc_dentry_path();
+
+ *ret_file = NULL;
+
+ spin_lock(&tcon->open_file_lock);
+ list_for_each_entry(cfile, &tcon->openFileList, tlist) {
+ struct cifsInodeInfo *cinode;
+ const char *full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
+ }
+ if (strcmp(full_path, name))
+ continue;
+
+ cinode = CIFS_I(d_inode(cfile->dentry));
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ *ret_file = find_readable_file(cinode, 0);
+ return *ret_file ? 0 : -ENOENT;
+ }
+
+ spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
+ return -ENOENT;
+}
+
+void
+cifs_writedata_release(struct kref *refcount)
+{
+ struct cifs_writedata *wdata = container_of(refcount,
+ struct cifs_writedata, refcount);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (wdata->mr) {
+ smbd_deregister_mr(wdata->mr);
+ wdata->mr = NULL;
+ }
+#endif
+
+ if (wdata->cfile)
+ cifsFileInfo_put(wdata->cfile);
+
+ kfree(wdata);
+}
+
+/*
+ * Write failed with a retryable error. Resend the write request. It's also
+ * possible that the page was redirtied so re-clean the page.
+ */
+static void
+cifs_writev_requeue(struct cifs_writedata *wdata)
+{
+ int rc = 0;
+ struct inode *inode = d_inode(wdata->cfile->dentry);
+ struct TCP_Server_Info *server;
+ unsigned int rest_len = wdata->bytes;
+ loff_t fpos = wdata->offset;
+
+ server = tlink_tcon(wdata->cfile->tlink)->ses->server;
+ do {
+ struct cifs_writedata *wdata2;
+ unsigned int wsize, cur_len;
+
+ wsize = server->ops->wp_retry_size(inode);
+ if (wsize < rest_len) {
+ if (wsize < PAGE_SIZE) {
+ rc = -EOPNOTSUPP;
+ break;
+ }
+ cur_len = min(round_down(wsize, PAGE_SIZE), rest_len);
+ } else {
+ cur_len = rest_len;
+ }
+
+ wdata2 = cifs_writedata_alloc(cifs_writev_complete);
+ if (!wdata2) {
+ rc = -ENOMEM;
+ break;
+ }
+
+ wdata2->sync_mode = wdata->sync_mode;
+ wdata2->offset = fpos;
+ wdata2->bytes = cur_len;
+ wdata2->iter = wdata->iter;
+
+ iov_iter_advance(&wdata2->iter, fpos - wdata->offset);
+ iov_iter_truncate(&wdata2->iter, wdata2->bytes);
+
+ if (iov_iter_is_xarray(&wdata2->iter))
+ /* Check for pages having been redirtied and clean
+ * them. We can do this by walking the xarray. If
+ * it's not an xarray, then it's a DIO and we shouldn't
+ * be mucking around with the page bits.
+ */
+ cifs_undirty_folios(inode, fpos, cur_len);
+
+ rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY,
+ &wdata2->cfile);
+ if (!wdata2->cfile) {
+ cifs_dbg(VFS, "No writable handle to retry writepages rc=%d\n",
+ rc);
+ if (!is_retryable_error(rc))
+ rc = -EBADF;
+ } else {
+ wdata2->pid = wdata2->cfile->pid;
+ rc = server->ops->async_writev(wdata2,
+ cifs_writedata_release);
+ }
+
+ kref_put(&wdata2->refcount, cifs_writedata_release);
+ if (rc) {
+ if (is_retryable_error(rc))
+ continue;
+ fpos += cur_len;
+ rest_len -= cur_len;
+ break;
+ }
+
+ fpos += cur_len;
+ rest_len -= cur_len;
+ } while (rest_len > 0);
+
+ /* Clean up remaining pages from the original wdata */
+ if (iov_iter_is_xarray(&wdata->iter))
+ cifs_pages_write_failed(inode, fpos, rest_len);
+
+ if (rc != 0 && !is_retryable_error(rc))
+ mapping_set_error(inode->i_mapping, rc);
+ kref_put(&wdata->refcount, cifs_writedata_release);
+}
+
+void
+cifs_writev_complete(struct work_struct *work)
+{
+ struct cifs_writedata *wdata = container_of(work,
+ struct cifs_writedata, work);
+ struct inode *inode = d_inode(wdata->cfile->dentry);
+
+ if (wdata->result == 0) {
+ spin_lock(&inode->i_lock);
+ cifs_update_eof(CIFS_I(inode), wdata->offset, wdata->bytes);
+ spin_unlock(&inode->i_lock);
+ cifs_stats_bytes_written(tlink_tcon(wdata->cfile->tlink),
+ wdata->bytes);
+ } else if (wdata->sync_mode == WB_SYNC_ALL && wdata->result == -EAGAIN)
+ return cifs_writev_requeue(wdata);
+
+ if (wdata->result == -EAGAIN)
+ cifs_pages_write_redirty(inode, wdata->offset, wdata->bytes);
+ else if (wdata->result < 0)
+ cifs_pages_write_failed(inode, wdata->offset, wdata->bytes);
+ else
+ cifs_pages_written_back(inode, wdata->offset, wdata->bytes);
+
+ if (wdata->result != -EAGAIN)
+ mapping_set_error(inode->i_mapping, wdata->result);
+ kref_put(&wdata->refcount, cifs_writedata_release);
+}
+
+struct cifs_writedata *cifs_writedata_alloc(work_func_t complete)
+{
+ struct cifs_writedata *wdata;
+
+ wdata = kzalloc(sizeof(*wdata), GFP_NOFS);
+ if (wdata != NULL) {
+ kref_init(&wdata->refcount);
+ INIT_LIST_HEAD(&wdata->list);
+ init_completion(&wdata->done);
+ INIT_WORK(&wdata->work, complete);
+ }
+ return wdata;
+}
+
+static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
+{
+ struct address_space *mapping = page->mapping;
+ loff_t offset = (loff_t)page->index << PAGE_SHIFT;
+ char *write_data;
+ int rc = -EFAULT;
+ int bytes_written = 0;
+ struct inode *inode;
+ struct cifsFileInfo *open_file;
+
+ if (!mapping || !mapping->host)
+ return -EFAULT;
+
+ inode = page->mapping->host;
+
+ offset += (loff_t)from;
+ write_data = kmap(page);
+ write_data += from;
+
+ if ((to > PAGE_SIZE) || (from > to)) {
+ kunmap(page);
+ return -EIO;
+ }
+
+ /* racing with truncate? */
+ if (offset > mapping->host->i_size) {
+ kunmap(page);
+ return 0; /* don't care */
+ }
+
+ /* check to make sure that we are not extending the file */
+ if (mapping->host->i_size - offset < (loff_t)to)
+ to = (unsigned)(mapping->host->i_size - offset);
+
+ rc = cifs_get_writable_file(CIFS_I(mapping->host), FIND_WR_ANY,
+ &open_file);
+ if (!rc) {
+ bytes_written = cifs_write(open_file, open_file->pid,
+ write_data, to - from, &offset);
+ cifsFileInfo_put(open_file);
+ /* Does mm or vfs already set times? */
+ inode->i_atime = inode->i_mtime = current_time(inode);
+ if ((bytes_written > 0) && (offset))
+ rc = 0;
+ else if (bytes_written < 0)
+ rc = bytes_written;
+ else
+ rc = -EFAULT;
+ } else {
+ cifs_dbg(FYI, "No writable handle for write page rc=%d\n", rc);
+ if (!is_retryable_error(rc))
+ rc = -EIO;
+ }
+
+ kunmap(page);
+ return rc;
+}
+
+/*
+ * Extend the region to be written back to include subsequent contiguously
+ * dirty pages if possible, but don't sleep while doing so.
+ */
+static void cifs_extend_writeback(struct address_space *mapping,
+ long *_count,
+ loff_t start,
+ int max_pages,
+ size_t max_len,
+ unsigned int *_len)
+{
+ struct folio_batch batch;
+ struct folio *folio;
+ unsigned int psize, nr_pages;
+ size_t len = *_len;
+ pgoff_t index = (start + len) / PAGE_SIZE;
+ bool stop = true;
+ unsigned int i;
+ XA_STATE(xas, &mapping->i_pages, index);
+
+ folio_batch_init(&batch);
+
+ do {
+ /* Firstly, we gather up a batch of contiguous dirty pages
+ * under the RCU read lock - but we can't clear the dirty flags
+ * there if any of those pages are mapped.
+ */
+ rcu_read_lock();
+
+ xas_for_each(&xas, folio, ULONG_MAX) {
+ stop = true;
+ if (xas_retry(&xas, folio))
+ continue;
+ if (xa_is_value(folio))
+ break;
+ if (folio_index(folio) != index)
+ break;
+ if (!folio_try_get_rcu(folio)) {
+ xas_reset(&xas);
+ continue;
+ }
+ nr_pages = folio_nr_pages(folio);
+ if (nr_pages > max_pages)
+ break;
+
+ /* Has the page moved or been split? */
+ if (unlikely(folio != xas_reload(&xas))) {
+ folio_put(folio);
+ break;
+ }
+
+ if (!folio_trylock(folio)) {
+ folio_put(folio);
+ break;
+ }
+ if (!folio_test_dirty(folio) || folio_test_writeback(folio)) {
+ folio_unlock(folio);
+ folio_put(folio);
+ break;
+ }
+
+ max_pages -= nr_pages;
+ psize = folio_size(folio);
+ len += psize;
+ stop = false;
+ if (max_pages <= 0 || len >= max_len || *_count <= 0)
+ stop = true;
+
+ index += nr_pages;
+ if (!folio_batch_add(&batch, folio))
+ break;
+ if (stop)
+ break;
+ }
+
+ if (!stop)
+ xas_pause(&xas);
+ rcu_read_unlock();
+
+ /* Now, if we obtained any pages, we can shift them to being
+ * writable and mark them for caching.
+ */
+ if (!folio_batch_count(&batch))
+ break;
+
+ for (i = 0; i < folio_batch_count(&batch); i++) {
+ folio = batch.folios[i];
+ /* The folio should be locked, dirty and not undergoing
+ * writeback from the loop above.
+ */
+ if (!folio_clear_dirty_for_io(folio))
+ WARN_ON(1);
+ if (folio_start_writeback(folio))
+ WARN_ON(1);
+
+ *_count -= folio_nr_pages(folio);
+ folio_unlock(folio);
+ }
+
+ folio_batch_release(&batch);
+ cond_resched();
+ } while (!stop);
+
+ *_len = len;
+}
+
+/*
+ * Write back the locked page and any subsequent non-locked dirty pages.
+ */
+static ssize_t cifs_write_back_from_locked_folio(struct address_space *mapping,
+ struct writeback_control *wbc,
+ struct folio *folio,
+ loff_t start, loff_t end)
+{
+ struct inode *inode = mapping->host;
+ struct TCP_Server_Info *server;
+ struct cifs_writedata *wdata;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_credits credits_on_stack;
+ struct cifs_credits *credits = &credits_on_stack;
+ struct cifsFileInfo *cfile = NULL;
+ unsigned int xid, wsize, len;
+ loff_t i_size = i_size_read(inode);
+ size_t max_len;
+ long count = wbc->nr_to_write;
+ int rc;
+
+ /* The folio should be locked, dirty and not undergoing writeback. */
+ if (folio_start_writeback(folio))
+ WARN_ON(1);
+
+ count -= folio_nr_pages(folio);
+ len = folio_size(folio);
+
+ xid = get_xid();
+ server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses);
+
+ rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile);
+ if (rc) {
+ cifs_dbg(VFS, "No writable handle in writepages rc=%d\n", rc);
+ goto err_xid;
+ }
+
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
+ &wsize, credits);
+ if (rc != 0)
+ goto err_close;
+
+ wdata = cifs_writedata_alloc(cifs_writev_complete);
+ if (!wdata) {
+ rc = -ENOMEM;
+ goto err_uncredit;
+ }
+
+ wdata->sync_mode = wbc->sync_mode;
+ wdata->offset = folio_pos(folio);
+ wdata->pid = cfile->pid;
+ wdata->credits = credits_on_stack;
+ wdata->cfile = cfile;
+ wdata->server = server;
+ cfile = NULL;
+
+ /* Find all consecutive lockable dirty pages, stopping when we find a
+ * page that is not immediately lockable, is not dirty or is missing,
+ * or we reach the end of the range.
+ */
+ if (start < i_size) {
+ /* Trim the write to the EOF; the extra data is ignored. Also
+ * put an upper limit on the size of a single storedata op.
+ */
+ max_len = wsize;
+ max_len = min_t(unsigned long long, max_len, end - start + 1);
+ max_len = min_t(unsigned long long, max_len, i_size - start);
+
+ if (len < max_len) {
+ int max_pages = INT_MAX;
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_pages = server->smbd_conn->max_frmr_depth;
+#endif
+ max_pages -= folio_nr_pages(folio);
+
+ if (max_pages > 0)
+ cifs_extend_writeback(mapping, &count, start,
+ max_pages, max_len, &len);
+ }
+ len = min_t(loff_t, len, max_len);
+ }
+
+ wdata->bytes = len;
+
+ /* We now have a contiguous set of dirty pages, each with writeback
+ * set; the first page is still locked at this point, but all the rest
+ * have been unlocked.
+ */
+ folio_unlock(folio);
+
+ if (start < i_size) {
+ iov_iter_xarray(&wdata->iter, ITER_SOURCE, &mapping->i_pages,
+ start, len);
+
+ rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes);
+ if (rc)
+ goto err_wdata;
+
+ if (wdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else
+ rc = wdata->server->ops->async_writev(wdata,
+ cifs_writedata_release);
+ if (rc >= 0) {
+ kref_put(&wdata->refcount, cifs_writedata_release);
+ goto err_close;
+ }
+ } else {
+ /* The dirty region was entirely beyond the EOF. */
+ cifs_pages_written_back(inode, start, len);
+ rc = 0;
+ }
+
+err_wdata:
+ kref_put(&wdata->refcount, cifs_writedata_release);
+err_uncredit:
+ add_credits_and_wake_if(server, credits, 0);
+err_close:
+ if (cfile)
+ cifsFileInfo_put(cfile);
+err_xid:
+ free_xid(xid);
+ if (rc == 0) {
+ wbc->nr_to_write = count;
+ rc = len;
+ } else if (is_retryable_error(rc)) {
+ cifs_pages_write_redirty(inode, start, len);
+ } else {
+ cifs_pages_write_failed(inode, start, len);
+ mapping_set_error(mapping, rc);
+ }
+ /* Indication to update ctime and mtime as close is deferred */
+ set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
+ return rc;
+}
+
+/*
+ * write a region of pages back to the server
+ */
+static int cifs_writepages_region(struct address_space *mapping,
+ struct writeback_control *wbc,
+ loff_t start, loff_t end, loff_t *_next)
+{
+ struct folio_batch fbatch;
+ int skips = 0;
+
+ folio_batch_init(&fbatch);
+ do {
+ int nr;
+ pgoff_t index = start / PAGE_SIZE;
+
+ nr = filemap_get_folios_tag(mapping, &index, end / PAGE_SIZE,
+ PAGECACHE_TAG_DIRTY, &fbatch);
+ if (!nr)
+ break;
+
+ for (int i = 0; i < nr; i++) {
+ ssize_t ret;
+ struct folio *folio = fbatch.folios[i];
+
+redo_folio:
+ start = folio_pos(folio); /* May regress with THPs */
+
+ /* At this point we hold neither the i_pages lock nor the
+ * page lock: the page may be truncated or invalidated
+ * (changing page->mapping to NULL), or even swizzled
+ * back from swapper_space to tmpfs file mapping
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE) {
+ ret = folio_lock_killable(folio);
+ if (ret < 0)
+ goto write_error;
+ } else {
+ if (!folio_trylock(folio))
+ goto skip_write;
+ }
+
+ if (folio_mapping(folio) != mapping ||
+ !folio_test_dirty(folio)) {
+ start += folio_size(folio);
+ folio_unlock(folio);
+ continue;
+ }
+
+ if (folio_test_writeback(folio) ||
+ folio_test_fscache(folio)) {
+ folio_unlock(folio);
+ if (wbc->sync_mode == WB_SYNC_NONE)
+ goto skip_write;
+
+ folio_wait_writeback(folio);
+#ifdef CONFIG_CIFS_FSCACHE
+ folio_wait_fscache(folio);
+#endif
+ goto redo_folio;
+ }
+
+ if (!folio_clear_dirty_for_io(folio))
+ /* We hold the page lock - it should've been dirty. */
+ WARN_ON(1);
+
+ ret = cifs_write_back_from_locked_folio(mapping, wbc, folio, start, end);
+ if (ret < 0)
+ goto write_error;
+
+ start += ret;
+ continue;
+
+write_error:
+ folio_batch_release(&fbatch);
+ *_next = start;
+ return ret;
+
+skip_write:
+ /*
+ * Too many skipped writes, or need to reschedule?
+ * Treat it as a write error without an error code.
+ */
+ if (skips >= 5 || need_resched()) {
+ ret = 0;
+ goto write_error;
+ }
+
+ /* Otherwise, just skip that folio and go on to the next */
+ skips++;
+ start += folio_size(folio);
+ continue;
+ }
+
+ folio_batch_release(&fbatch);
+ cond_resched();
+ } while (wbc->nr_to_write > 0);
+
+ *_next = start;
+ return 0;
+}
+
+/*
+ * Write some of the pending data back to the server
+ */
+static int cifs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ loff_t start, next;
+ int ret;
+
+ /* We have to be careful as we can end up racing with setattr()
+ * truncating the pagecache since the caller doesn't take a lock here
+ * to prevent it.
+ */
+
+ if (wbc->range_cyclic) {
+ start = mapping->writeback_index * PAGE_SIZE;
+ ret = cifs_writepages_region(mapping, wbc, start, LLONG_MAX, &next);
+ if (ret == 0) {
+ mapping->writeback_index = next / PAGE_SIZE;
+ if (start > 0 && wbc->nr_to_write > 0) {
+ ret = cifs_writepages_region(mapping, wbc, 0,
+ start, &next);
+ if (ret == 0)
+ mapping->writeback_index =
+ next / PAGE_SIZE;
+ }
+ }
+ } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
+ ret = cifs_writepages_region(mapping, wbc, 0, LLONG_MAX, &next);
+ if (wbc->nr_to_write > 0 && ret == 0)
+ mapping->writeback_index = next / PAGE_SIZE;
+ } else {
+ ret = cifs_writepages_region(mapping, wbc,
+ wbc->range_start, wbc->range_end, &next);
+ }
+
+ return ret;
+}
+
+static int
+cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
+{
+ int rc;
+ unsigned int xid;
+
+ xid = get_xid();
+/* BB add check for wbc flags */
+ get_page(page);
+ if (!PageUptodate(page))
+ cifs_dbg(FYI, "ppw - page not up to date\n");
+
+ /*
+ * Set the "writeback" flag, and clear "dirty" in the radix tree.
+ *
+ * A writepage() implementation always needs to do either this,
+ * or re-dirty the page with "redirty_page_for_writepage()" in
+ * the case of a failure.
+ *
+ * Just unlocking the page will cause the radix tree tag-bits
+ * to fail to update with the state of the page correctly.
+ */
+ set_page_writeback(page);
+retry_write:
+ rc = cifs_partialpagewrite(page, 0, PAGE_SIZE);
+ if (is_retryable_error(rc)) {
+ if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN)
+ goto retry_write;
+ redirty_page_for_writepage(wbc, page);
+ } else if (rc != 0) {
+ SetPageError(page);
+ mapping_set_error(page->mapping, rc);
+ } else {
+ SetPageUptodate(page);
+ }
+ end_page_writeback(page);
+ put_page(page);
+ free_xid(xid);
+ return rc;
+}
+
+static int cifs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ int rc;
+ struct inode *inode = mapping->host;
+ struct cifsFileInfo *cfile = file->private_data;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+ struct folio *folio = page_folio(page);
+ __u32 pid;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ pid = cfile->pid;
+ else
+ pid = current->tgid;
+
+ cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
+ page, pos, copied);
+
+ if (folio_test_checked(folio)) {
+ if (copied == len)
+ folio_mark_uptodate(folio);
+ folio_clear_checked(folio);
+ } else if (!folio_test_uptodate(folio) && copied == PAGE_SIZE)
+ folio_mark_uptodate(folio);
+
+ if (!folio_test_uptodate(folio)) {
+ char *page_data;
+ unsigned offset = pos & (PAGE_SIZE - 1);
+ unsigned int xid;
+
+ xid = get_xid();
+ /* this is probably better than directly calling
+ partialpage_write since in this function the file handle is
+ known which we might as well leverage */
+ /* BB check if anything else missing out of ppw
+ such as updating last write time */
+ page_data = kmap(page);
+ rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
+ /* if (rc < 0) should we set writebehind rc? */
+ kunmap(page);
+
+ free_xid(xid);
+ } else {
+ rc = copied;
+ pos += copied;
+ set_page_dirty(page);
+ }
+
+ if (rc > 0) {
+ spin_lock(&inode->i_lock);
+ if (pos > inode->i_size) {
+ i_size_write(inode, pos);
+ inode->i_blocks = (512 - 1 + pos) >> 9;
+ }
+ spin_unlock(&inode->i_lock);
+ }
+
+ unlock_page(page);
+ put_page(page);
+ /* Indication to update ctime and mtime as close is deferred */
+ set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
+
+ return rc;
+}
+
+int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
+ int datasync)
+{
+ unsigned int xid;
+ int rc = 0;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifsFileInfo *smbfile = file->private_data;
+ struct inode *inode = file_inode(file);
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+
+ rc = file_write_and_wait_range(file, start, end);
+ if (rc) {
+ trace_cifs_fsync_err(inode->i_ino, rc);
+ return rc;
+ }
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
+ file, datasync);
+
+ if (!CIFS_CACHE_READ(CIFS_I(inode))) {
+ rc = cifs_zap_mapping(inode);
+ if (rc) {
+ cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc);
+ rc = 0; /* don't care about it in fsync */
+ }
+ }
+
+ tcon = tlink_tcon(smbfile->tlink);
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
+ server = tcon->ses->server;
+ if (server->ops->flush == NULL) {
+ rc = -ENOSYS;
+ goto strict_fsync_exit;
+ }
+
+ if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) {
+ smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY);
+ if (smbfile) {
+ rc = server->ops->flush(xid, tcon, &smbfile->fid);
+ cifsFileInfo_put(smbfile);
+ } else
+ cifs_dbg(FYI, "ignore fsync for file not open for write\n");
+ } else
+ rc = server->ops->flush(xid, tcon, &smbfile->fid);
+ }
+
+strict_fsync_exit:
+ free_xid(xid);
+ return rc;
+}
+
+int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ unsigned int xid;
+ int rc = 0;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ struct cifsFileInfo *smbfile = file->private_data;
+ struct inode *inode = file_inode(file);
+ struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
+
+ rc = file_write_and_wait_range(file, start, end);
+ if (rc) {
+ trace_cifs_fsync_err(file_inode(file)->i_ino, rc);
+ return rc;
+ }
+
+ xid = get_xid();
+
+ cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n",
+ file, datasync);
+
+ tcon = tlink_tcon(smbfile->tlink);
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
+ server = tcon->ses->server;
+ if (server->ops->flush == NULL) {
+ rc = -ENOSYS;
+ goto fsync_exit;
+ }
+
+ if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) {
+ smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY);
+ if (smbfile) {
+ rc = server->ops->flush(xid, tcon, &smbfile->fid);
+ cifsFileInfo_put(smbfile);
+ } else
+ cifs_dbg(FYI, "ignore fsync for file not open for write\n");
+ } else
+ rc = server->ops->flush(xid, tcon, &smbfile->fid);
+ }
+
+fsync_exit:
+ free_xid(xid);
+ return rc;
+}
+
+/*
+ * As file closes, flush all cached write data for this inode checking
+ * for write behind errors.
+ */
+int cifs_flush(struct file *file, fl_owner_t id)
+{
+ struct inode *inode = file_inode(file);
+ int rc = 0;
+
+ if (file->f_mode & FMODE_WRITE)
+ rc = filemap_write_and_wait(inode->i_mapping);
+
+ cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc);
+ if (rc) {
+ /* get more nuanced writeback errors */
+ rc = filemap_check_wb_err(file->f_mapping, 0);
+ trace_cifs_flush_err(inode->i_ino, rc);
+ }
+ return rc;
+}
+
+static void
+cifs_uncached_writedata_release(struct kref *refcount)
+{
+ struct cifs_writedata *wdata = container_of(refcount,
+ struct cifs_writedata, refcount);
+
+ kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release);
+ cifs_writedata_release(refcount);
+}
+
+static void collect_uncached_write_data(struct cifs_aio_ctx *ctx);
+
+static void
+cifs_uncached_writev_complete(struct work_struct *work)
+{
+ struct cifs_writedata *wdata = container_of(work,
+ struct cifs_writedata, work);
+ struct inode *inode = d_inode(wdata->cfile->dentry);
+ struct cifsInodeInfo *cifsi = CIFS_I(inode);
+
+ spin_lock(&inode->i_lock);
+ cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
+ if (cifsi->server_eof > inode->i_size)
+ i_size_write(inode, cifsi->server_eof);
+ spin_unlock(&inode->i_lock);
+
+ complete(&wdata->done);
+ collect_uncached_write_data(wdata->ctx);
+ /* the below call can possibly free the last ref to aio ctx */
+ kref_put(&wdata->refcount, cifs_uncached_writedata_release);
+}
+
+static int
+cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
+ struct cifs_aio_ctx *ctx)
+{
+ unsigned int wsize;
+ struct cifs_credits credits;
+ int rc;
+ struct TCP_Server_Info *server = wdata->server;
+
+ do {
+ if (wdata->cfile->invalidHandle) {
+ rc = cifs_reopen_file(wdata->cfile, false);
+ if (rc == -EAGAIN)
+ continue;
+ else if (rc)
+ break;
+ }
+
+
+ /*
+ * Wait for credits to resend this wdata.
+ * Note: we are attempting to resend the whole wdata not in
+ * segments
+ */
+ do {
+ rc = server->ops->wait_mtu_credits(server, wdata->bytes,
+ &wsize, &credits);
+ if (rc)
+ goto fail;
+
+ if (wsize < wdata->bytes) {
+ add_credits_and_wake_if(server, &credits, 0);
+ msleep(1000);
+ }
+ } while (wsize < wdata->bytes);
+ wdata->credits = credits;
+
+ rc = adjust_credits(server, &wdata->credits, wdata->bytes);
+
+ if (!rc) {
+ if (wdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else {
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (wdata->mr) {
+ wdata->mr->need_invalidate = true;
+ smbd_deregister_mr(wdata->mr);
+ wdata->mr = NULL;
+ }
+#endif
+ rc = server->ops->async_writev(wdata,
+ cifs_uncached_writedata_release);
+ }
+ }
+
+ /* If the write was successfully sent, we are done */
+ if (!rc) {
+ list_add_tail(&wdata->list, wdata_list);
+ return 0;
+ }
+
+ /* Roll back credits and retry if needed */
+ add_credits_and_wake_if(server, &wdata->credits, 0);
+ } while (rc == -EAGAIN);
+
+fail:
+ kref_put(&wdata->refcount, cifs_uncached_writedata_release);
+ return rc;
+}
+
+/*
+ * Select span of a bvec iterator we're going to use. Limit it by both maximum
+ * size and maximum number of segments.
+ */
+static size_t cifs_limit_bvec_subset(const struct iov_iter *iter, size_t max_size,
+ size_t max_segs, unsigned int *_nsegs)
+{
+ const struct bio_vec *bvecs = iter->bvec;
+ unsigned int nbv = iter->nr_segs, ix = 0, nsegs = 0;
+ size_t len, span = 0, n = iter->count;
+ size_t skip = iter->iov_offset;
+
+ if (WARN_ON(!iov_iter_is_bvec(iter)) || n == 0)
+ return 0;
+
+ while (n && ix < nbv && skip) {
+ len = bvecs[ix].bv_len;
+ if (skip < len)
+ break;
+ skip -= len;
+ n -= len;
+ ix++;
+ }
+
+ while (n && ix < nbv) {
+ len = min3(n, bvecs[ix].bv_len - skip, max_size);
+ span += len;
+ max_size -= len;
+ nsegs++;
+ ix++;
+ if (max_size == 0 || nsegs >= max_segs)
+ break;
+ skip = 0;
+ n -= len;
+ }
+
+ *_nsegs = nsegs;
+ return span;
+}
+
+static int
+cifs_write_from_iter(loff_t fpos, size_t len, struct iov_iter *from,
+ struct cifsFileInfo *open_file,
+ struct cifs_sb_info *cifs_sb, struct list_head *wdata_list,
+ struct cifs_aio_ctx *ctx)
+{
+ int rc = 0;
+ size_t cur_len, max_len;
+ struct cifs_writedata *wdata;
+ pid_t pid;
+ struct TCP_Server_Info *server;
+ unsigned int xid, max_segs = INT_MAX;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ pid = open_file->pid;
+ else
+ pid = current->tgid;
+
+ server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
+ xid = get_xid();
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_segs = server->smbd_conn->max_frmr_depth;
+#endif
+
+ do {
+ struct cifs_credits credits_on_stack;
+ struct cifs_credits *credits = &credits_on_stack;
+ unsigned int wsize, nsegs = 0;
+
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
+
+ if (open_file->invalidHandle) {
+ rc = cifs_reopen_file(open_file, false);
+ if (rc == -EAGAIN)
+ continue;
+ else if (rc)
+ break;
+ }
+
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
+ &wsize, credits);
+ if (rc)
+ break;
+
+ max_len = min_t(const size_t, len, wsize);
+ if (!max_len) {
+ rc = -EAGAIN;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ cur_len = cifs_limit_bvec_subset(from, max_len, max_segs, &nsegs);
+ cifs_dbg(FYI, "write_from_iter len=%zx/%zx nsegs=%u/%lu/%u\n",
+ cur_len, max_len, nsegs, from->nr_segs, max_segs);
+ if (cur_len == 0) {
+ rc = -EIO;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ wdata = cifs_writedata_alloc(cifs_uncached_writev_complete);
+ if (!wdata) {
+ rc = -ENOMEM;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ wdata->sync_mode = WB_SYNC_ALL;
+ wdata->offset = (__u64)fpos;
+ wdata->cfile = cifsFileInfo_get(open_file);
+ wdata->server = server;
+ wdata->pid = pid;
+ wdata->bytes = cur_len;
+ wdata->credits = credits_on_stack;
+ wdata->iter = *from;
+ wdata->ctx = ctx;
+ kref_get(&ctx->refcount);
+
+ iov_iter_truncate(&wdata->iter, cur_len);
+
+ rc = adjust_credits(server, &wdata->credits, wdata->bytes);
+
+ if (!rc) {
+ if (wdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else
+ rc = server->ops->async_writev(wdata,
+ cifs_uncached_writedata_release);
+ }
+
+ if (rc) {
+ add_credits_and_wake_if(server, &wdata->credits, 0);
+ kref_put(&wdata->refcount,
+ cifs_uncached_writedata_release);
+ if (rc == -EAGAIN)
+ continue;
+ break;
+ }
+
+ list_add_tail(&wdata->list, wdata_list);
+ iov_iter_advance(from, cur_len);
+ fpos += cur_len;
+ len -= cur_len;
+ } while (len > 0);
+
+ free_xid(xid);
+ return rc;
+}
+
+static void collect_uncached_write_data(struct cifs_aio_ctx *ctx)
+{
+ struct cifs_writedata *wdata, *tmp;
+ struct cifs_tcon *tcon;
+ struct cifs_sb_info *cifs_sb;
+ struct dentry *dentry = ctx->cfile->dentry;
+ ssize_t rc;
+
+ tcon = tlink_tcon(ctx->cfile->tlink);
+ cifs_sb = CIFS_SB(dentry->d_sb);
+
+ mutex_lock(&ctx->aio_mutex);
+
+ if (list_empty(&ctx->list)) {
+ mutex_unlock(&ctx->aio_mutex);
+ return;
+ }
+
+ rc = ctx->rc;
+ /*
+ * Wait for and collect replies for any successful sends in order of
+ * increasing offset. Once an error is hit, then return without waiting
+ * for any more replies.
+ */
+restart_loop:
+ list_for_each_entry_safe(wdata, tmp, &ctx->list, list) {
+ if (!rc) {
+ if (!try_wait_for_completion(&wdata->done)) {
+ mutex_unlock(&ctx->aio_mutex);
+ return;
+ }
+
+ if (wdata->result)
+ rc = wdata->result;
+ else
+ ctx->total_len += wdata->bytes;
+
+ /* resend call if it's a retryable error */
+ if (rc == -EAGAIN) {
+ struct list_head tmp_list;
+ struct iov_iter tmp_from = ctx->iter;
+
+ INIT_LIST_HEAD(&tmp_list);
+ list_del_init(&wdata->list);
+
+ if (ctx->direct_io)
+ rc = cifs_resend_wdata(
+ wdata, &tmp_list, ctx);
+ else {
+ iov_iter_advance(&tmp_from,
+ wdata->offset - ctx->pos);
+
+ rc = cifs_write_from_iter(wdata->offset,
+ wdata->bytes, &tmp_from,
+ ctx->cfile, cifs_sb, &tmp_list,
+ ctx);
+
+ kref_put(&wdata->refcount,
+ cifs_uncached_writedata_release);
+ }
+
+ list_splice(&tmp_list, &ctx->list);
+ goto restart_loop;
+ }
+ }
+ list_del_init(&wdata->list);
+ kref_put(&wdata->refcount, cifs_uncached_writedata_release);
+ }
+
+ cifs_stats_bytes_written(tcon, ctx->total_len);
+ set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags);
+
+ ctx->rc = (rc == 0) ? ctx->total_len : rc;
+
+ mutex_unlock(&ctx->aio_mutex);
+
+ if (ctx->iocb && ctx->iocb->ki_complete)
+ ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
+ else
+ complete(&ctx->done);
+}
+
+static ssize_t __cifs_writev(
+ struct kiocb *iocb, struct iov_iter *from, bool direct)
+{
+ struct file *file = iocb->ki_filp;
+ ssize_t total_written = 0;
+ struct cifsFileInfo *cfile;
+ struct cifs_tcon *tcon;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_aio_ctx *ctx;
+ int rc;
+
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
+ return rc;
+
+ cifs_sb = CIFS_FILE_SB(file);
+ cfile = file->private_data;
+ tcon = tlink_tcon(cfile->tlink);
+
+ if (!tcon->ses->server->ops->async_writev)
+ return -ENOSYS;
+
+ ctx = cifs_aio_ctx_alloc();
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->cfile = cifsFileInfo_get(cfile);
+
+ if (!is_sync_kiocb(iocb))
+ ctx->iocb = iocb;
+
+ ctx->pos = iocb->ki_pos;
+ ctx->direct_io = direct;
+ ctx->nr_pinned_pages = 0;
+
+ if (user_backed_iter(from)) {
+ /*
+ * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
+ * they contain references to the calling process's virtual
+ * memory layout which won't be available in an async worker
+ * thread. This also takes a pin on every folio involved.
+ */
+ rc = netfs_extract_user_iter(from, iov_iter_count(from),
+ &ctx->iter, 0);
+ if (rc < 0) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return rc;
+ }
+
+ ctx->nr_pinned_pages = rc;
+ ctx->bv = (void *)ctx->iter.bvec;
+ ctx->bv_need_unpin = iov_iter_extract_will_pin(from);
+ } else if ((iov_iter_is_bvec(from) || iov_iter_is_kvec(from)) &&
+ !is_sync_kiocb(iocb)) {
+ /*
+ * If the op is asynchronous, we need to copy the list attached
+ * to a BVEC/KVEC-type iterator, but we assume that the storage
+ * will be pinned by the caller; in any case, we may or may not
+ * be able to pin the pages, so we don't try.
+ */
+ ctx->bv = (void *)dup_iter(&ctx->iter, from, GFP_KERNEL);
+ if (!ctx->bv) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -ENOMEM;
+ }
+ } else {
+ /*
+ * Otherwise, we just pass the iterator down as-is and rely on
+ * the caller to make sure the pages referred to by the
+ * iterator don't evaporate.
+ */
+ ctx->iter = *from;
+ }
+
+ ctx->len = iov_iter_count(&ctx->iter);
+
+ /* grab a lock here due to read response handlers can access ctx */
+ mutex_lock(&ctx->aio_mutex);
+
+ rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &ctx->iter,
+ cfile, cifs_sb, &ctx->list, ctx);
+
+ /*
+ * If at least one write was successfully sent, then discard any rc
+ * value from the later writes. If the other write succeeds, then
+ * we'll end up returning whatever was written. If it fails, then
+ * we'll get a new rc value from that.
+ */
+ if (!list_empty(&ctx->list))
+ rc = 0;
+
+ mutex_unlock(&ctx->aio_mutex);
+
+ if (rc) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return rc;
+ }
+
+ if (!is_sync_kiocb(iocb)) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -EIOCBQUEUED;
+ }
+
+ rc = wait_for_completion_killable(&ctx->done);
+ if (rc) {
+ mutex_lock(&ctx->aio_mutex);
+ ctx->rc = rc = -EINTR;
+ total_written = ctx->total_len;
+ mutex_unlock(&ctx->aio_mutex);
+ } else {
+ rc = ctx->rc;
+ total_written = ctx->total_len;
+ }
+
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+
+ if (unlikely(!total_written))
+ return rc;
+
+ iocb->ki_pos += total_written;
+ return total_written;
+}
+
+ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+
+ cifs_revalidate_mapping(file->f_inode);
+ return __cifs_writev(iocb, from, true);
+}
+
+ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from)
+{
+ return __cifs_writev(iocb, from, false);
+}
+
+static ssize_t
+cifs_writev(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
+ struct inode *inode = file->f_mapping->host;
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
+ ssize_t rc;
+
+ inode_lock(inode);
+ /*
+ * We need to hold the sem to be sure nobody modifies lock list
+ * with a brlock that prevents writing.
+ */
+ down_read(&cinode->lock_sem);
+
+ rc = generic_write_checks(iocb, from);
+ if (rc <= 0)
+ goto out;
+
+ if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from),
+ server->vals->exclusive_lock_type, 0,
+ NULL, CIFS_WRITE_OP))
+ rc = __generic_file_write_iter(iocb, from);
+ else
+ rc = -EACCES;
+out:
+ up_read(&cinode->lock_sem);
+ inode_unlock(inode);
+
+ if (rc > 0)
+ rc = generic_write_sync(iocb, rc);
+ return rc;
+}
+
+ssize_t
+cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)
+ iocb->ki_filp->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ ssize_t written;
+
+ written = cifs_get_writer(cinode);
+ if (written)
+ return written;
+
+ if (CIFS_CACHE_WRITE(cinode)) {
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
+ && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) {
+ written = generic_file_write_iter(iocb, from);
+ goto out;
+ }
+ written = cifs_writev(iocb, from);
+ goto out;
+ }
+ /*
+ * For non-oplocked files in strict cache mode we need to write the data
+ * to the server exactly from the pos to pos+len-1 rather than flush all
+ * affected pages because it may cause a error with mandatory locks on
+ * these pages but not on the region from pos to ppos+len-1.
+ */
+ written = cifs_user_writev(iocb, from);
+ if (CIFS_CACHE_READ(cinode)) {
+ /*
+ * We have read level caching and we have just sent a write
+ * request to the server thus making data in the cache stale.
+ * Zap the cache and set oplock/lease level to NONE to avoid
+ * reading stale data from the cache. All subsequent read
+ * operations will read new data from the server.
+ */
+ cifs_zap_mapping(inode);
+ cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n",
+ inode);
+ cinode->oplock = 0;
+ }
+out:
+ cifs_put_writer(cinode);
+ return written;
+}
+
+static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete)
+{
+ struct cifs_readdata *rdata;
+
+ rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
+ if (rdata) {
+ kref_init(&rdata->refcount);
+ INIT_LIST_HEAD(&rdata->list);
+ init_completion(&rdata->done);
+ INIT_WORK(&rdata->work, complete);
+ }
+
+ return rdata;
+}
+
+void
+cifs_readdata_release(struct kref *refcount)
+{
+ struct cifs_readdata *rdata = container_of(refcount,
+ struct cifs_readdata, refcount);
+
+ if (rdata->ctx)
+ kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (rdata->mr) {
+ smbd_deregister_mr(rdata->mr);
+ rdata->mr = NULL;
+ }
+#endif
+ if (rdata->cfile)
+ cifsFileInfo_put(rdata->cfile);
+
+ kfree(rdata);
+}
+
+static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
+
+static void
+cifs_uncached_readv_complete(struct work_struct *work)
+{
+ struct cifs_readdata *rdata = container_of(work,
+ struct cifs_readdata, work);
+
+ complete(&rdata->done);
+ collect_uncached_read_data(rdata->ctx);
+ /* the below call can possibly free the last ref to aio ctx */
+ kref_put(&rdata->refcount, cifs_readdata_release);
+}
+
+static int cifs_resend_rdata(struct cifs_readdata *rdata,
+ struct list_head *rdata_list,
+ struct cifs_aio_ctx *ctx)
+{
+ unsigned int rsize;
+ struct cifs_credits credits;
+ int rc;
+ struct TCP_Server_Info *server;
+
+ /* XXX: should we pick a new channel here? */
+ server = rdata->server;
+
+ do {
+ if (rdata->cfile->invalidHandle) {
+ rc = cifs_reopen_file(rdata->cfile, true);
+ if (rc == -EAGAIN)
+ continue;
+ else if (rc)
+ break;
+ }
+
+ /*
+ * Wait for credits to resend this rdata.
+ * Note: we are attempting to resend the whole rdata not in
+ * segments
+ */
+ do {
+ rc = server->ops->wait_mtu_credits(server, rdata->bytes,
+ &rsize, &credits);
+
+ if (rc)
+ goto fail;
+
+ if (rsize < rdata->bytes) {
+ add_credits_and_wake_if(server, &credits, 0);
+ msleep(1000);
+ }
+ } while (rsize < rdata->bytes);
+ rdata->credits = credits;
+
+ rc = adjust_credits(server, &rdata->credits, rdata->bytes);
+ if (!rc) {
+ if (rdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else {
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (rdata->mr) {
+ rdata->mr->need_invalidate = true;
+ smbd_deregister_mr(rdata->mr);
+ rdata->mr = NULL;
+ }
+#endif
+ rc = server->ops->async_readv(rdata);
+ }
+ }
+
+ /* If the read was successfully sent, we are done */
+ if (!rc) {
+ /* Add to aio pending list */
+ list_add_tail(&rdata->list, rdata_list);
+ return 0;
+ }
+
+ /* Roll back credits and retry if needed */
+ add_credits_and_wake_if(server, &rdata->credits, 0);
+ } while (rc == -EAGAIN);
+
+fail:
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ return rc;
+}
+
+static int
+cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
+ struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
+ struct cifs_aio_ctx *ctx)
+{
+ struct cifs_readdata *rdata;
+ unsigned int rsize, nsegs, max_segs = INT_MAX;
+ struct cifs_credits credits_on_stack;
+ struct cifs_credits *credits = &credits_on_stack;
+ size_t cur_len, max_len;
+ int rc;
+ pid_t pid;
+ struct TCP_Server_Info *server;
+
+ server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_segs = server->smbd_conn->max_frmr_depth;
+#endif
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ pid = open_file->pid;
+ else
+ pid = current->tgid;
+
+ do {
+ if (open_file->invalidHandle) {
+ rc = cifs_reopen_file(open_file, true);
+ if (rc == -EAGAIN)
+ continue;
+ else if (rc)
+ break;
+ }
+
+ if (cifs_sb->ctx->rsize == 0)
+ cifs_sb->ctx->rsize =
+ server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
+ cifs_sb->ctx);
+
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
+ &rsize, credits);
+ if (rc)
+ break;
+
+ max_len = min_t(size_t, len, rsize);
+
+ cur_len = cifs_limit_bvec_subset(&ctx->iter, max_len,
+ max_segs, &nsegs);
+ cifs_dbg(FYI, "read-to-iter len=%zx/%zx nsegs=%u/%lu/%u\n",
+ cur_len, max_len, nsegs, ctx->iter.nr_segs, max_segs);
+ if (cur_len == 0) {
+ rc = -EIO;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ rdata = cifs_readdata_alloc(cifs_uncached_readv_complete);
+ if (!rdata) {
+ add_credits_and_wake_if(server, credits, 0);
+ rc = -ENOMEM;
+ break;
+ }
+
+ rdata->server = server;
+ rdata->cfile = cifsFileInfo_get(open_file);
+ rdata->offset = fpos;
+ rdata->bytes = cur_len;
+ rdata->pid = pid;
+ rdata->credits = credits_on_stack;
+ rdata->ctx = ctx;
+ kref_get(&ctx->refcount);
+
+ rdata->iter = ctx->iter;
+ iov_iter_truncate(&rdata->iter, cur_len);
+
+ rc = adjust_credits(server, &rdata->credits, rdata->bytes);
+
+ if (!rc) {
+ if (rdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else
+ rc = server->ops->async_readv(rdata);
+ }
+
+ if (rc) {
+ add_credits_and_wake_if(server, &rdata->credits, 0);
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ if (rc == -EAGAIN)
+ continue;
+ break;
+ }
+
+ list_add_tail(&rdata->list, rdata_list);
+ iov_iter_advance(&ctx->iter, cur_len);
+ fpos += cur_len;
+ len -= cur_len;
+ } while (len > 0);
+
+ return rc;
+}
+
+static void
+collect_uncached_read_data(struct cifs_aio_ctx *ctx)
+{
+ struct cifs_readdata *rdata, *tmp;
+ struct cifs_sb_info *cifs_sb;
+ int rc;
+
+ cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb);
+
+ mutex_lock(&ctx->aio_mutex);
+
+ if (list_empty(&ctx->list)) {
+ mutex_unlock(&ctx->aio_mutex);
+ return;
+ }
+
+ rc = ctx->rc;
+ /* the loop below should proceed in the order of increasing offsets */
+again:
+ list_for_each_entry_safe(rdata, tmp, &ctx->list, list) {
+ if (!rc) {
+ if (!try_wait_for_completion(&rdata->done)) {
+ mutex_unlock(&ctx->aio_mutex);
+ return;
+ }
+
+ if (rdata->result == -EAGAIN) {
+ /* resend call if it's a retryable error */
+ struct list_head tmp_list;
+ unsigned int got_bytes = rdata->got_bytes;
+
+ list_del_init(&rdata->list);
+ INIT_LIST_HEAD(&tmp_list);
+
+ if (ctx->direct_io) {
+ /*
+ * Re-use rdata as this is a
+ * direct I/O
+ */
+ rc = cifs_resend_rdata(
+ rdata,
+ &tmp_list, ctx);
+ } else {
+ rc = cifs_send_async_read(
+ rdata->offset + got_bytes,
+ rdata->bytes - got_bytes,
+ rdata->cfile, cifs_sb,
+ &tmp_list, ctx);
+
+ kref_put(&rdata->refcount,
+ cifs_readdata_release);
+ }
+
+ list_splice(&tmp_list, &ctx->list);
+
+ goto again;
+ } else if (rdata->result)
+ rc = rdata->result;
+
+ /* if there was a short read -- discard anything left */
+ if (rdata->got_bytes && rdata->got_bytes < rdata->bytes)
+ rc = -ENODATA;
+
+ ctx->total_len += rdata->got_bytes;
+ }
+ list_del_init(&rdata->list);
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ }
+
+ /* mask nodata case */
+ if (rc == -ENODATA)
+ rc = 0;
+
+ ctx->rc = (rc == 0) ? (ssize_t)ctx->total_len : rc;
+
+ mutex_unlock(&ctx->aio_mutex);
+
+ if (ctx->iocb && ctx->iocb->ki_complete)
+ ctx->iocb->ki_complete(ctx->iocb, ctx->rc);
+ else
+ complete(&ctx->done);
+}
+
+static ssize_t __cifs_readv(
+ struct kiocb *iocb, struct iov_iter *to, bool direct)
+{
+ size_t len;
+ struct file *file = iocb->ki_filp;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsFileInfo *cfile;
+ struct cifs_tcon *tcon;
+ ssize_t rc, total_read = 0;
+ loff_t offset = iocb->ki_pos;
+ struct cifs_aio_ctx *ctx;
+
+ len = iov_iter_count(to);
+ if (!len)
+ return 0;
+
+ cifs_sb = CIFS_FILE_SB(file);
+ cfile = file->private_data;
+ tcon = tlink_tcon(cfile->tlink);
+
+ if (!tcon->ses->server->ops->async_readv)
+ return -ENOSYS;
+
+ if ((file->f_flags & O_ACCMODE) == O_WRONLY)
+ cifs_dbg(FYI, "attempting read on write only file instance\n");
+
+ ctx = cifs_aio_ctx_alloc();
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->pos = offset;
+ ctx->direct_io = direct;
+ ctx->len = len;
+ ctx->cfile = cifsFileInfo_get(cfile);
+ ctx->nr_pinned_pages = 0;
+
+ if (!is_sync_kiocb(iocb))
+ ctx->iocb = iocb;
+
+ if (user_backed_iter(to)) {
+ /*
+ * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
+ * they contain references to the calling process's virtual
+ * memory layout which won't be available in an async worker
+ * thread. This also takes a pin on every folio involved.
+ */
+ rc = netfs_extract_user_iter(to, iov_iter_count(to),
+ &ctx->iter, 0);
+ if (rc < 0) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return rc;
+ }
+
+ ctx->nr_pinned_pages = rc;
+ ctx->bv = (void *)ctx->iter.bvec;
+ ctx->bv_need_unpin = iov_iter_extract_will_pin(to);
+ ctx->should_dirty = true;
+ } else if ((iov_iter_is_bvec(to) || iov_iter_is_kvec(to)) &&
+ !is_sync_kiocb(iocb)) {
+ /*
+ * If the op is asynchronous, we need to copy the list attached
+ * to a BVEC/KVEC-type iterator, but we assume that the storage
+ * will be retained by the caller; in any case, we may or may
+ * not be able to pin the pages, so we don't try.
+ */
+ ctx->bv = (void *)dup_iter(&ctx->iter, to, GFP_KERNEL);
+ if (!ctx->bv) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -ENOMEM;
+ }
+ } else {
+ /*
+ * Otherwise, we just pass the iterator down as-is and rely on
+ * the caller to make sure the pages referred to by the
+ * iterator don't evaporate.
+ */
+ ctx->iter = *to;
+ }
+
+ if (direct) {
+ rc = filemap_write_and_wait_range(file->f_inode->i_mapping,
+ offset, offset + len - 1);
+ if (rc) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -EAGAIN;
+ }
+ }
+
+ /* grab a lock here due to read response handlers can access ctx */
+ mutex_lock(&ctx->aio_mutex);
+
+ rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx);
+
+ /* if at least one read request send succeeded, then reset rc */
+ if (!list_empty(&ctx->list))
+ rc = 0;
+
+ mutex_unlock(&ctx->aio_mutex);
+
+ if (rc) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return rc;
+ }
+
+ if (!is_sync_kiocb(iocb)) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -EIOCBQUEUED;
+ }
+
+ rc = wait_for_completion_killable(&ctx->done);
+ if (rc) {
+ mutex_lock(&ctx->aio_mutex);
+ ctx->rc = rc = -EINTR;
+ total_read = ctx->total_len;
+ mutex_unlock(&ctx->aio_mutex);
+ } else {
+ rc = ctx->rc;
+ total_read = ctx->total_len;
+ }
+
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+
+ if (total_read) {
+ iocb->ki_pos += total_read;
+ return total_read;
+ }
+ return rc;
+}
+
+ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to)
+{
+ return __cifs_readv(iocb, to, true);
+}
+
+ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to)
+{
+ return __cifs_readv(iocb, to, false);
+}
+
+ssize_t
+cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)
+ iocb->ki_filp->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ int rc = -EACCES;
+
+ /*
+ * In strict cache mode we need to read from the server all the time
+ * if we don't have level II oplock because the server can delay mtime
+ * change - so we can't make a decision about inode invalidating.
+ * And we can also fail with pagereading if there are mandatory locks
+ * on pages affected by this read but not on the region from pos to
+ * pos+len-1.
+ */
+ if (!CIFS_CACHE_READ(cinode))
+ return cifs_user_readv(iocb, to);
+
+ if (cap_unix(tcon->ses) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ return generic_file_read_iter(iocb, to);
+
+ /*
+ * We need to hold the sem to be sure nobody modifies lock list
+ * with a brlock that prevents reading.
+ */
+ down_read(&cinode->lock_sem);
+ if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to),
+ tcon->ses->server->vals->shared_lock_type,
+ 0, NULL, CIFS_READ_OP))
+ rc = generic_file_read_iter(iocb, to);
+ up_read(&cinode->lock_sem);
+ return rc;
+}
+
+static ssize_t
+cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
+{
+ int rc = -EACCES;
+ unsigned int bytes_read = 0;
+ unsigned int total_read;
+ unsigned int current_read_size;
+ unsigned int rsize;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+ unsigned int xid;
+ char *cur_offset;
+ struct cifsFileInfo *open_file;
+ struct cifs_io_parms io_parms = {0};
+ int buf_type = CIFS_NO_BUFFER;
+ __u32 pid;
+
+ xid = get_xid();
+ cifs_sb = CIFS_FILE_SB(file);
+
+ /* FIXME: set up handlers for larger reads and/or convert to async */
+ rsize = min_t(unsigned int, cifs_sb->ctx->rsize, CIFSMaxBufSize);
+
+ if (file->private_data == NULL) {
+ rc = -EBADF;
+ free_xid(xid);
+ return rc;
+ }
+ open_file = file->private_data;
+ tcon = tlink_tcon(open_file->tlink);
+ server = cifs_pick_channel(tcon->ses);
+
+ if (!server->ops->sync_read) {
+ free_xid(xid);
+ return -ENOSYS;
+ }
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ pid = open_file->pid;
+ else
+ pid = current->tgid;
+
+ if ((file->f_flags & O_ACCMODE) == O_WRONLY)
+ cifs_dbg(FYI, "attempting read on write only file instance\n");
+
+ for (total_read = 0, cur_offset = read_data; read_size > total_read;
+ total_read += bytes_read, cur_offset += bytes_read) {
+ do {
+ current_read_size = min_t(uint, read_size - total_read,
+ rsize);
+ /*
+ * For windows me and 9x we do not want to request more
+ * than it negotiated since it will refuse the read
+ * then.
+ */
+ if (!(tcon->ses->capabilities &
+ tcon->ses->server->vals->cap_large_files)) {
+ current_read_size = min_t(uint,
+ current_read_size, CIFSMaxBufSize);
+ }
+ if (open_file->invalidHandle) {
+ rc = cifs_reopen_file(open_file, true);
+ if (rc != 0)
+ break;
+ }
+ io_parms.pid = pid;
+ io_parms.tcon = tcon;
+ io_parms.offset = *offset;
+ io_parms.length = current_read_size;
+ io_parms.server = server;
+ rc = server->ops->sync_read(xid, &open_file->fid, &io_parms,
+ &bytes_read, &cur_offset,
+ &buf_type);
+ } while (rc == -EAGAIN);
+
+ if (rc || (bytes_read == 0)) {
+ if (total_read) {
+ break;
+ } else {
+ free_xid(xid);
+ return rc;
+ }
+ } else {
+ cifs_stats_bytes_read(tcon, total_read);
+ *offset += bytes_read;
+ }
+ }
+ free_xid(xid);
+ return total_read;
+}
+
+/*
+ * If the page is mmap'ed into a process' page tables, then we need to make
+ * sure that it doesn't change while being written back.
+ */
+static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf)
+{
+ struct folio *folio = page_folio(vmf->page);
+
+ /* Wait for the folio to be written to the cache before we allow it to
+ * be modified. We then assume the entire folio will need writing back.
+ */
+#ifdef CONFIG_CIFS_FSCACHE
+ if (folio_test_fscache(folio) &&
+ folio_wait_fscache_killable(folio) < 0)
+ return VM_FAULT_RETRY;
+#endif
+
+ folio_wait_writeback(folio);
+
+ if (folio_lock_killable(folio) < 0)
+ return VM_FAULT_RETRY;
+ return VM_FAULT_LOCKED;
+}
+
+static const struct vm_operations_struct cifs_file_vm_ops = {
+ .fault = filemap_fault,
+ .map_pages = filemap_map_pages,
+ .page_mkwrite = cifs_page_mkwrite,
+};
+
+int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int xid, rc = 0;
+ struct inode *inode = file_inode(file);
+
+ xid = get_xid();
+
+ if (!CIFS_CACHE_READ(CIFS_I(inode)))
+ rc = cifs_zap_mapping(inode);
+ if (!rc)
+ rc = generic_file_mmap(file, vma);
+ if (!rc)
+ vma->vm_ops = &cifs_file_vm_ops;
+
+ free_xid(xid);
+ return rc;
+}
+
+int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int rc, xid;
+
+ xid = get_xid();
+
+ rc = cifs_revalidate_file(file);
+ if (rc)
+ cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
+ rc);
+ if (!rc)
+ rc = generic_file_mmap(file, vma);
+ if (!rc)
+ vma->vm_ops = &cifs_file_vm_ops;
+
+ free_xid(xid);
+ return rc;
+}
+
+/*
+ * Unlock a bunch of folios in the pagecache.
+ */
+static void cifs_unlock_folios(struct address_space *mapping, pgoff_t first, pgoff_t last)
+{
+ struct folio *folio;
+ XA_STATE(xas, &mapping->i_pages, first);
+
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ folio_unlock(folio);
+ }
+ rcu_read_unlock();
+}
+
+static void cifs_readahead_complete(struct work_struct *work)
+{
+ struct cifs_readdata *rdata = container_of(work,
+ struct cifs_readdata, work);
+ struct folio *folio;
+ pgoff_t last;
+ bool good = rdata->result == 0 || (rdata->result == -EAGAIN && rdata->got_bytes);
+
+ XA_STATE(xas, &rdata->mapping->i_pages, rdata->offset / PAGE_SIZE);
+
+ if (good)
+ cifs_readahead_to_fscache(rdata->mapping->host,
+ rdata->offset, rdata->bytes);
+
+ if (iov_iter_count(&rdata->iter) > 0)
+ iov_iter_zero(iov_iter_count(&rdata->iter), &rdata->iter);
+
+ last = (rdata->offset + rdata->bytes - 1) / PAGE_SIZE;
+
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ if (good) {
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
+ }
+ folio_unlock(folio);
+ }
+ rcu_read_unlock();
+
+ kref_put(&rdata->refcount, cifs_readdata_release);
+}
+
+static void cifs_readahead(struct readahead_control *ractl)
+{
+ struct cifsFileInfo *open_file = ractl->file->private_data;
+ struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(ractl->file);
+ struct TCP_Server_Info *server;
+ unsigned int xid, nr_pages, cache_nr_pages = 0;
+ unsigned int ra_pages;
+ pgoff_t next_cached = ULONG_MAX, ra_index;
+ bool caching = fscache_cookie_enabled(cifs_inode_cookie(ractl->mapping->host)) &&
+ cifs_inode_cookie(ractl->mapping->host)->cache_priv;
+ bool check_cache = caching;
+ pid_t pid;
+ int rc = 0;
+
+ /* Note that readahead_count() lags behind our dequeuing of pages from
+ * the ractl, wo we have to keep track for ourselves.
+ */
+ ra_pages = readahead_count(ractl);
+ ra_index = readahead_index(ractl);
+
+ xid = get_xid();
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
+ pid = open_file->pid;
+ else
+ pid = current->tgid;
+
+ server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
+
+ cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
+ __func__, ractl->file, ractl->mapping, ra_pages);
+
+ /*
+ * Chop the readahead request up into rsize-sized read requests.
+ */
+ while ((nr_pages = ra_pages)) {
+ unsigned int i, rsize;
+ struct cifs_readdata *rdata;
+ struct cifs_credits credits_on_stack;
+ struct cifs_credits *credits = &credits_on_stack;
+ struct folio *folio;
+ pgoff_t fsize;
+
+ /*
+ * Find out if we have anything cached in the range of
+ * interest, and if so, where the next chunk of cached data is.
+ */
+ if (caching) {
+ if (check_cache) {
+ rc = cifs_fscache_query_occupancy(
+ ractl->mapping->host, ra_index, nr_pages,
+ &next_cached, &cache_nr_pages);
+ if (rc < 0)
+ caching = false;
+ check_cache = false;
+ }
+
+ if (ra_index == next_cached) {
+ /*
+ * TODO: Send a whole batch of pages to be read
+ * by the cache.
+ */
+ folio = readahead_folio(ractl);
+ fsize = folio_nr_pages(folio);
+ ra_pages -= fsize;
+ ra_index += fsize;
+ if (cifs_readpage_from_fscache(ractl->mapping->host,
+ &folio->page) < 0) {
+ /*
+ * TODO: Deal with cache read failure
+ * here, but for the moment, delegate
+ * that to readpage.
+ */
+ caching = false;
+ }
+ folio_unlock(folio);
+ next_cached += fsize;
+ cache_nr_pages -= fsize;
+ if (cache_nr_pages == 0)
+ check_cache = true;
+ continue;
+ }
+ }
+
+ if (open_file->invalidHandle) {
+ rc = cifs_reopen_file(open_file, true);
+ if (rc) {
+ if (rc == -EAGAIN)
+ continue;
+ break;
+ }
+ }
+
+ if (cifs_sb->ctx->rsize == 0)
+ cifs_sb->ctx->rsize =
+ server->ops->negotiate_rsize(tlink_tcon(open_file->tlink),
+ cifs_sb->ctx);
+
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
+ &rsize, credits);
+ if (rc)
+ break;
+ nr_pages = min_t(size_t, rsize / PAGE_SIZE, ra_pages);
+ if (next_cached != ULONG_MAX)
+ nr_pages = min_t(size_t, nr_pages, next_cached - ra_index);
+
+ /*
+ * Give up immediately if rsize is too small to read an entire
+ * page. The VFS will fall back to readpage. We should never
+ * reach this point however since we set ra_pages to 0 when the
+ * rsize is smaller than a cache page.
+ */
+ if (unlikely(!nr_pages)) {
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ rdata = cifs_readdata_alloc(cifs_readahead_complete);
+ if (!rdata) {
+ /* best to give up if we're out of mem */
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
+
+ rdata->offset = ra_index * PAGE_SIZE;
+ rdata->bytes = nr_pages * PAGE_SIZE;
+ rdata->cfile = cifsFileInfo_get(open_file);
+ rdata->server = server;
+ rdata->mapping = ractl->mapping;
+ rdata->pid = pid;
+ rdata->credits = credits_on_stack;
+
+ for (i = 0; i < nr_pages; i++) {
+ if (!readahead_folio(ractl))
+ WARN_ON(1);
+ }
+ ra_pages -= nr_pages;
+ ra_index += nr_pages;
+
+ iov_iter_xarray(&rdata->iter, ITER_DEST, &rdata->mapping->i_pages,
+ rdata->offset, rdata->bytes);
+
+ rc = adjust_credits(server, &rdata->credits, rdata->bytes);
+ if (!rc) {
+ if (rdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else
+ rc = server->ops->async_readv(rdata);
+ }
+
+ if (rc) {
+ add_credits_and_wake_if(server, &rdata->credits, 0);
+ cifs_unlock_folios(rdata->mapping,
+ rdata->offset / PAGE_SIZE,
+ (rdata->offset + rdata->bytes - 1) / PAGE_SIZE);
+ /* Fallback to the readpage in error/reconnect cases */
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ break;
+ }
+
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ }
+
+ free_xid(xid);
+}
+
+/*
+ * cifs_readpage_worker must be called with the page pinned
+ */
+static int cifs_readpage_worker(struct file *file, struct page *page,
+ loff_t *poffset)
+{
+ char *read_data;
+ int rc;
+
+ /* Is the page cached? */
+ rc = cifs_readpage_from_fscache(file_inode(file), page);
+ if (rc == 0)
+ goto read_complete;
+
+ read_data = kmap(page);
+ /* for reads over a certain size could initiate async read ahead */
+
+ rc = cifs_read(file, read_data, PAGE_SIZE, poffset);
+
+ if (rc < 0)
+ goto io_error;
+ else
+ cifs_dbg(FYI, "Bytes read %d\n", rc);
+
+ /* we do not want atime to be less than mtime, it broke some apps */
+ file_inode(file)->i_atime = current_time(file_inode(file));
+ if (timespec64_compare(&(file_inode(file)->i_atime), &(file_inode(file)->i_mtime)))
+ file_inode(file)->i_atime = file_inode(file)->i_mtime;
+ else
+ file_inode(file)->i_atime = current_time(file_inode(file));
+
+ if (PAGE_SIZE > rc)
+ memset(read_data + rc, 0, PAGE_SIZE - rc);
+
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ rc = 0;
+
+io_error:
+ kunmap(page);
+ unlock_page(page);
+
+read_complete:
+ return rc;
+}
+
+static int cifs_read_folio(struct file *file, struct folio *folio)
+{
+ struct page *page = &folio->page;
+ loff_t offset = page_file_offset(page);
+ int rc = -EACCES;
+ unsigned int xid;
+
+ xid = get_xid();
+
+ if (file->private_data == NULL) {
+ rc = -EBADF;
+ free_xid(xid);
+ return rc;
+ }
+
+ cifs_dbg(FYI, "read_folio %p at offset %d 0x%x\n",
+ page, (int)offset, (int)offset);
+
+ rc = cifs_readpage_worker(file, page, &offset);
+
+ free_xid(xid);
+ return rc;
+}
+
+static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
+{
+ struct cifsFileInfo *open_file;
+
+ spin_lock(&cifs_inode->open_file_lock);
+ list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
+ if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
+ spin_unlock(&cifs_inode->open_file_lock);
+ return 1;
+ }
+ }
+ spin_unlock(&cifs_inode->open_file_lock);
+ return 0;
+}
+
+/* We do not want to update the file size from server for inodes
+ open for write - to avoid races with writepage extending
+ the file - in the future we could consider allowing
+ refreshing the inode only on increases in the file size
+ but this is tricky to do without racing with writebehind
+ page caching in the current Linux kernel design */
+bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
+{
+ if (!cifsInode)
+ return true;
+
+ if (is_inode_writable(cifsInode)) {
+ /* This inode is open for write at least once */
+ struct cifs_sb_info *cifs_sb;
+
+ cifs_sb = CIFS_SB(cifsInode->netfs.inode.i_sb);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
+ /* since no page cache to corrupt on directio
+ we can change size safely */
+ return true;
+ }
+
+ if (i_size_read(&cifsInode->netfs.inode) < end_of_file)
+ return true;
+
+ return false;
+ } else
+ return true;
+}
+
+static int cifs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len,
+ struct page **pagep, void **fsdata)
+{
+ int oncethru = 0;
+ pgoff_t index = pos >> PAGE_SHIFT;
+ loff_t offset = pos & (PAGE_SIZE - 1);
+ loff_t page_start = pos & PAGE_MASK;
+ loff_t i_size;
+ struct page *page;
+ int rc = 0;
+
+ cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len);
+
+start:
+ page = grab_cache_page_write_begin(mapping, index);
+ if (!page) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (PageUptodate(page))
+ goto out;
+
+ /*
+ * If we write a full page it will be up to date, no need to read from
+ * the server. If the write is short, we'll end up doing a sync write
+ * instead.
+ */
+ if (len == PAGE_SIZE)
+ goto out;
+
+ /*
+ * optimize away the read when we have an oplock, and we're not
+ * expecting to use any of the data we'd be reading in. That
+ * is, when the page lies beyond the EOF, or straddles the EOF
+ * and the write will cover all of the existing data.
+ */
+ if (CIFS_CACHE_READ(CIFS_I(mapping->host))) {
+ i_size = i_size_read(mapping->host);
+ if (page_start >= i_size ||
+ (offset == 0 && (pos + len) >= i_size)) {
+ zero_user_segments(page, 0, offset,
+ offset + len,
+ PAGE_SIZE);
+ /*
+ * PageChecked means that the parts of the page
+ * to which we're not writing are considered up
+ * to date. Once the data is copied to the
+ * page, it can be set uptodate.
+ */
+ SetPageChecked(page);
+ goto out;
+ }
+ }
+
+ if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) {
+ /*
+ * might as well read a page, it is fast enough. If we get
+ * an error, we don't need to return it. cifs_write_end will
+ * do a sync write instead since PG_uptodate isn't set.
+ */
+ cifs_readpage_worker(file, page, &page_start);
+ put_page(page);
+ oncethru = 1;
+ goto start;
+ } else {
+ /* we could try using another file handle if there is one -
+ but how would we lock it to prevent close of that handle
+ racing with this read? In any case
+ this will be written out by write_end so is fine */
+ }
+out:
+ *pagep = page;
+ return rc;
+}
+
+static bool cifs_release_folio(struct folio *folio, gfp_t gfp)
+{
+ if (folio_test_private(folio))
+ return 0;
+ if (folio_test_fscache(folio)) {
+ if (current_is_kswapd() || !(gfp & __GFP_FS))
+ return false;
+ folio_wait_fscache(folio);
+ }
+ fscache_note_page_release(cifs_inode_cookie(folio->mapping->host));
+ return true;
+}
+
+static void cifs_invalidate_folio(struct folio *folio, size_t offset,
+ size_t length)
+{
+ folio_wait_fscache(folio);
+}
+
+static int cifs_launder_folio(struct folio *folio)
+{
+ int rc = 0;
+ loff_t range_start = folio_pos(folio);
+ loff_t range_end = range_start + folio_size(folio);
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = 0,
+ .range_start = range_start,
+ .range_end = range_end,
+ };
+
+ cifs_dbg(FYI, "Launder page: %lu\n", folio->index);
+
+ if (folio_clear_dirty_for_io(folio))
+ rc = cifs_writepage_locked(&folio->page, &wbc);
+
+ folio_wait_fscache(folio);
+ return rc;
+}
+
+void cifs_oplock_break(struct work_struct *work)
+{
+ struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
+ oplock_break);
+ struct inode *inode = d_inode(cfile->dentry);
+ struct cifsInodeInfo *cinode = CIFS_I(inode);
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ int rc = 0;
+ bool purge_cache = false, oplock_break_cancelled;
+ __u64 persistent_fid, volatile_fid;
+ __u16 net_fid;
+
+ wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS,
+ TASK_UNINTERRUPTIBLE);
+
+ server->ops->downgrade_oplock(server, cinode, cfile->oplock_level,
+ cfile->oplock_epoch, &purge_cache);
+
+ if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) &&
+ cifs_has_mand_locks(cinode)) {
+ cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n",
+ inode);
+ cinode->oplock = 0;
+ }
+
+ if (inode && S_ISREG(inode->i_mode)) {
+ if (CIFS_CACHE_READ(cinode))
+ break_lease(inode, O_RDONLY);
+ else
+ break_lease(inode, O_WRONLY);
+ rc = filemap_fdatawrite(inode->i_mapping);
+ if (!CIFS_CACHE_READ(cinode) || purge_cache) {
+ rc = filemap_fdatawait(inode->i_mapping);
+ mapping_set_error(inode->i_mapping, rc);
+ cifs_zap_mapping(inode);
+ }
+ cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc);
+ if (CIFS_CACHE_WRITE(cinode))
+ goto oplock_break_ack;
+ }
+
+ rc = cifs_push_locks(cfile);
+ if (rc)
+ cifs_dbg(VFS, "Push locks rc = %d\n", rc);
+
+oplock_break_ack:
+ /*
+ * When oplock break is received and there are no active
+ * file handles but cached, then schedule deferred close immediately.
+ * So, new open will not use cached handle.
+ */
+
+ if (!CIFS_CACHE_HANDLE(cinode) && !list_empty(&cinode->deferred_closes))
+ cifs_close_deferred_file(cinode);
+
+ persistent_fid = cfile->fid.persistent_fid;
+ volatile_fid = cfile->fid.volatile_fid;
+ net_fid = cfile->fid.netfid;
+ oplock_break_cancelled = cfile->oplock_break_cancelled;
+
+ _cifsFileInfo_put(cfile, false /* do not wait for ourself */, false);
+ /*
+ * releasing stale oplock after recent reconnect of smb session using
+ * a now incorrect file handle is not a data integrity issue but do
+ * not bother sending an oplock release if session to server still is
+ * disconnected since oplock already released by the server
+ */
+ if (!oplock_break_cancelled) {
+ /* check for server null since can race with kill_sb calling tree disconnect */
+ if (tcon->ses && tcon->ses->server) {
+ rc = tcon->ses->server->ops->oplock_response(tcon, persistent_fid,
+ volatile_fid, net_fid, cinode);
+ cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
+ } else
+ pr_warn_once("lease break not sent for unmounted share\n");
+ }
+
+ cifs_done_oplock_break(cinode);
+}
+
+/*
+ * The presence of cifs_direct_io() in the address space ops vector
+ * allowes open() O_DIRECT flags which would have failed otherwise.
+ *
+ * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests
+ * so this method should never be called.
+ *
+ * Direct IO is not yet supported in the cached mode.
+ */
+static ssize_t
+cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter)
+{
+ /*
+ * FIXME
+ * Eventually need to support direct IO for non forcedirectio mounts
+ */
+ return -EINVAL;
+}
+
+static int cifs_swap_activate(struct swap_info_struct *sis,
+ struct file *swap_file, sector_t *span)
+{
+ struct cifsFileInfo *cfile = swap_file->private_data;
+ struct inode *inode = swap_file->f_mapping->host;
+ unsigned long blocks;
+ long long isize;
+
+ cifs_dbg(FYI, "swap activate\n");
+
+ if (!swap_file->f_mapping->a_ops->swap_rw)
+ /* Cannot support swap */
+ return -EINVAL;
+
+ spin_lock(&inode->i_lock);
+ blocks = inode->i_blocks;
+ isize = inode->i_size;
+ spin_unlock(&inode->i_lock);
+ if (blocks*512 < isize) {
+ pr_warn("swap activate: swapfile has holes\n");
+ return -EINVAL;
+ }
+ *span = sis->pages;
+
+ pr_warn_once("Swap support over SMB3 is experimental\n");
+
+ /*
+ * TODO: consider adding ACL (or documenting how) to prevent other
+ * users (on this or other systems) from reading it
+ */
+
+
+ /* TODO: add sk_set_memalloc(inet) or similar */
+
+ if (cfile)
+ cfile->swapfile = true;
+ /*
+ * TODO: Since file already open, we can't open with DENY_ALL here
+ * but we could add call to grab a byte range lock to prevent others
+ * from reading or writing the file
+ */
+
+ sis->flags |= SWP_FS_OPS;
+ return add_swap_extent(sis, 0, sis->max, 0);
+}
+
+static void cifs_swap_deactivate(struct file *file)
+{
+ struct cifsFileInfo *cfile = file->private_data;
+
+ cifs_dbg(FYI, "swap deactivate\n");
+
+ /* TODO: undo sk_set_memalloc(inet) will eventually be needed */
+
+ if (cfile)
+ cfile->swapfile = false;
+
+ /* do we need to unpin (or unlock) the file */
+}
+
+/*
+ * Mark a page as having been made dirty and thus needing writeback. We also
+ * need to pin the cache object to write back to.
+ */
+#ifdef CONFIG_CIFS_FSCACHE
+static bool cifs_dirty_folio(struct address_space *mapping, struct folio *folio)
+{
+ return fscache_dirty_folio(mapping, folio,
+ cifs_inode_cookie(mapping->host));
+}
+#else
+#define cifs_dirty_folio filemap_dirty_folio
+#endif
+
+const struct address_space_operations cifs_addr_ops = {
+ .read_folio = cifs_read_folio,
+ .readahead = cifs_readahead,
+ .writepages = cifs_writepages,
+ .write_begin = cifs_write_begin,
+ .write_end = cifs_write_end,
+ .dirty_folio = cifs_dirty_folio,
+ .release_folio = cifs_release_folio,
+ .direct_IO = cifs_direct_io,
+ .invalidate_folio = cifs_invalidate_folio,
+ .launder_folio = cifs_launder_folio,
+ .migrate_folio = filemap_migrate_folio,
+ /*
+ * TODO: investigate and if useful we could add an is_dirty_writeback
+ * helper if needed
+ */
+ .swap_activate = cifs_swap_activate,
+ .swap_deactivate = cifs_swap_deactivate,
+};
+
+/*
+ * cifs_readahead requires the server to support a buffer large enough to
+ * contain the header plus one complete page of data. Otherwise, we need
+ * to leave cifs_readahead out of the address space operations.
+ */
+const struct address_space_operations cifs_addr_ops_smallbuf = {
+ .read_folio = cifs_read_folio,
+ .writepages = cifs_writepages,
+ .write_begin = cifs_write_begin,
+ .write_end = cifs_write_end,
+ .dirty_folio = cifs_dirty_folio,
+ .release_folio = cifs_release_folio,
+ .invalidate_folio = cifs_invalidate_folio,
+ .launder_folio = cifs_launder_folio,
+ .migrate_folio = filemap_migrate_folio,
+};
projects / linux-2.6-block.git / commitdiff