[linux-2.6-block.git] / fs / cifs / smb2file.c

/*
 *   fs/cifs/smb2file.c
 *
 *   Copyright (C) International Business Machines  Corp., 2002, 2011
 *   Author(s): Steve French (sfrench@us.ibm.com),
 *              Pavel Shilovsky ((pshilovsky@samba.org) 2012
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "smb2proto.h"

int
smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
	       __u32 *oplock, FILE_ALL_INFO *buf)
{
	int rc;
	__le16 *smb2_path;
	struct smb2_file_all_info *smb2_data = NULL;
	__u8 smb2_oplock;
	struct cifs_fid *fid = oparms->fid;
	struct network_resiliency_req nr_ioctl_req;

	smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
	if (smb2_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
			    GFP_KERNEL);
	if (smb2_data == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	oparms->desired_access |= FILE_READ_ATTRIBUTES;
	smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;

	rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
		       NULL);
	if (rc)
		goto out;


	 if (oparms->tcon->use_resilient) {
		/* default timeout is 0, servers pick default (120 seconds) */
		nr_ioctl_req.Timeout =
			cpu_to_le32(oparms->tcon->handle_timeout);
		nr_ioctl_req.Reserved = 0;
		rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
			fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
			true /* is_fsctl */,
			(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
			CIFSMaxBufSize, NULL, NULL /* no return info */);
		if (rc == -EOPNOTSUPP) {
			cifs_dbg(VFS,
			     "resiliency not supported by server, disabling\n");
			oparms->tcon->use_resilient = false;
		} else if (rc)
			cifs_dbg(FYI, "error %d setting resiliency\n", rc);

		rc = 0;
	}

	if (buf) {
		/* if open response does not have IndexNumber field - get it */
		if (smb2_data->IndexNumber == 0) {
			rc = SMB2_get_srv_num(xid, oparms->tcon,
				      fid->persistent_fid,
				      fid->volatile_fid,
				      &smb2_data->IndexNumber);
			if (rc) {
				/*
				 * let get_inode_info disable server inode
				 * numbers
				 */
				smb2_data->IndexNumber = 0;
				rc = 0;
			}
		}
		move_smb2_info_to_cifs(buf, smb2_data);
	}

	*oplock = smb2_oplock;
out:
	kfree(smb2_data);
	kfree(smb2_path);
	return rc;
}

int
smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
		  const unsigned int xid)
{
	int rc = 0, stored_rc;
	unsigned int max_num, num = 0, max_buf;
	struct smb2_lock_element *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 = 1 + flock->fl_end - flock->fl_start;
	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 smb2_lock_element))
		return -EINVAL;

	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
	max_num = max_buf / sizeof(struct smb2_lock_element);
	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	cur = buf;

	down_write(&cinode->lock_sem);
	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 (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->Length = cpu_to_le64(li->length);
		cur->Offset = cpu_to_le64(li->offset);
		cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
		/*
		 * 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 = smb2_lockv(xid, tcon,
					       cfile->fid.persistent_fid,
					       cfile->fid.volatile_fid,
					       current->tgid, num, 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 = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
				       cfile->fid.volatile_fid, current->tgid,
				       num, 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;
}

static int
smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
		       struct smb2_lock_element *buf, unsigned int max_num)
{
	int rc = 0, stored_rc;
	struct cifsFileInfo *cfile = fdlocks->cfile;
	struct cifsLockInfo *li;
	unsigned int num = 0;
	struct smb2_lock_element *cur = buf;
	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);

	list_for_each_entry(li, &fdlocks->locks, llist) {
		cur->Length = cpu_to_le64(li->length);
		cur->Offset = cpu_to_le64(li->offset);
		cur->Flags = cpu_to_le32(li->type |
						SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
		if (++num == max_num) {
			stored_rc = smb2_lockv(xid, tcon,
					       cfile->fid.persistent_fid,
					       cfile->fid.volatile_fid,
					       current->tgid, num, buf);
			if (stored_rc)
				rc = stored_rc;
			cur = buf;
			num = 0;
		} else
			cur++;
	}
	if (num) {
		stored_rc = smb2_lockv(xid, tcon,
				       cfile->fid.persistent_fid,
				       cfile->fid.volatile_fid,
				       current->tgid, num, buf);
		if (stored_rc)
			rc = stored_rc;
	}

	return rc;
}

int
smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
{
	int rc = 0, stored_rc;
	unsigned int xid;
	unsigned int max_num, max_buf;
	struct smb2_lock_element *buf;
	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
	struct cifs_fid_locks *fdlocks;

	xid = get_xid();

	/*
	 * Accessing maxBuf is racy with cifs_reconnect - need to store value
	 * and check it for zero before using.
	 */
	max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
	if (max_buf < sizeof(struct smb2_lock_element)) {
		free_xid(xid);
		return -EINVAL;
	}

	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
	max_num = max_buf / sizeof(struct smb2_lock_element);
	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
	if (!buf) {
		free_xid(xid);
		return -ENOMEM;
	}

	list_for_each_entry(fdlocks, &cinode->llist, llist) {
		stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
		if (stored_rc)
			rc = stored_rc;
	}

	kfree(buf);
	free_xid(xid);
	return rc;
}
Commit	Line	Data
f0df737e PS	1	/*
	2	* fs/cifs/smb2file.c
	3	*
	4	* Copyright (C) International Business Machines Corp., 2002, 2011
	5	* Author(s): Steve French (sfrench@us.ibm.com),
	6	* Pavel Shilovsky ((pshilovsky@samba.org) 2012
	7	*
	8	* This library is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU Lesser General Public License as published
	10	* by the Free Software Foundation; either version 2.1 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	16	* the GNU Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public License
	19	* along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22	#include <linux/fs.h>
	23	#include <linux/stat.h>
	24	#include <linux/slab.h>
	25	#include <linux/pagemap.h>
	26	#include <asm/div64.h>
	27	#include "cifsfs.h"
	28	#include "cifspdu.h"
	29	#include "cifsglob.h"
	30	#include "cifsproto.h"
	31	#include "cifs_debug.h"
	32	#include "cifs_fs_sb.h"
	33	#include "cifs_unicode.h"
	34	#include "fscache.h"
	35	#include "smb2proto.h"
	36
	37	int
226730b4 PS	38	smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
226730b4 PS	39	__u32 oplock, FILE_ALL_INFO buf)
f0df737e PS	40	{
	41	int rc;
	42	__le16 *smb2_path;
	43	struct smb2_file_all_info *smb2_data = NULL;
729c0c9d	44	__u8 smb2_oplock;
226730b4	45	struct cifs_fid *fid = oparms->fid;
592fafe6	46	struct network_resiliency_req nr_ioctl_req;
f0df737e	47
226730b4	48	smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
f0df737e PS	49	if (smb2_path == NULL) {
	50	rc = -ENOMEM;
	51	goto out;
	52	}
	53
1bbe4997	54	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
f0df737e PS	55	GFP_KERNEL);
	56	if (smb2_data == NULL) {
	57	rc = -ENOMEM;
	58	goto out;
	59	}
	60
226730b4	61	oparms->desired_access \|= FILE_READ_ATTRIBUTES;
729c0c9d	62	smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
b8c32dbb	63
729c0c9d	64	rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
9d874c36	65	NULL);
f0df737e PS	66	if (rc)
	67	goto out;
	68
592fafe6 SF	69
592fafe6 SF	70	if (oparms->tcon->use_resilient) {
ca567eb2 SF	71	/* default timeout is 0, servers pick default (120 seconds) */
	72	nr_ioctl_req.Timeout =
	73	cpu_to_le32(oparms->tcon->handle_timeout);
592fafe6 SF	74	nr_ioctl_req.Reserved = 0;
592fafe6 SF	75	rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
51146625	76	fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
63a83b86	77	true /* is_fsctl */,
592fafe6	78	(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
153322f7	79	CIFSMaxBufSize, NULL, NULL /* no return info */);
592fafe6 SF	80	if (rc == -EOPNOTSUPP) {
	81	cifs_dbg(VFS,
	82	"resiliency not supported by server, disabling\n");
	83	oparms->tcon->use_resilient = false;
	84	} else if (rc)
	85	cifs_dbg(FYI, "error %d setting resiliency\n", rc);
	86
	87	rc = 0;
	88	}
	89
f0df737e	90	if (buf) {
89a5bfa3 SF	91	/* if open response does not have IndexNumber field - get it */
	92	if (smb2_data->IndexNumber == 0) {
	93	rc = SMB2_get_srv_num(xid, oparms->tcon,
	94	fid->persistent_fid,
f0df737e PS	95	fid->volatile_fid,
f0df737e PS	96	&smb2_data->IndexNumber);
89a5bfa3 SF	97	if (rc) {
	98	/*
	99	* let get_inode_info disable server inode
	100	* numbers
	101	*/
	102	smb2_data->IndexNumber = 0;
	103	rc = 0;
	104	}
f0df737e PS	105	}
	106	move_smb2_info_to_cifs(buf, smb2_data);
	107	}
	108
729c0c9d	109	*oplock = smb2_oplock;
f0df737e	110	out:
f0df737e PS	111	kfree(smb2_data);
	112	kfree(smb2_path);
	113	return rc;
	114	}
f7ba7fe6 PS	115
	116	int
	117	smb2_unlock_range(struct cifsFileInfo cfile, struct file_lock flock,
	118	const unsigned int xid)
	119	{
	120	int rc = 0, stored_rc;
	121	unsigned int max_num, num = 0, max_buf;
	122	struct smb2_lock_element buf, cur;
	123	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2b0143b5	124	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
f7ba7fe6 PS	125	struct cifsLockInfo li, tmp;
	126	__u64 length = 1 + flock->fl_end - flock->fl_start;
	127	struct list_head tmp_llist;
	128
	129	INIT_LIST_HEAD(&tmp_llist);
	130
	131	/*
	132	* Accessing maxBuf is racy with cifs_reconnect - need to store value
b9a74cde	133	* and check it before using.
f7ba7fe6 PS	134	*/
f7ba7fe6 PS	135	max_buf = tcon->ses->server->maxBuf;
b9a74cde	136	if (max_buf < sizeof(struct smb2_lock_element))
f7ba7fe6 PS	137	return -EINVAL;
f7ba7fe6 PS	138
92a8109e RL	139	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
92a8109e RL	140	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
f7ba7fe6	141	max_num = max_buf / sizeof(struct smb2_lock_element);
662e9b2b	142	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
f7ba7fe6 PS	143	if (!buf)
	144	return -ENOMEM;
	145
	146	cur = buf;
	147
1b4b55a1	148	down_write(&cinode->lock_sem);
f7ba7fe6 PS	149	list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
	150	if (flock->fl_start > li->offset \|\|
	151	(flock->fl_start + length) <
	152	(li->offset + li->length))
	153	continue;
	154	if (current->tgid != li->pid)
	155	continue;
	156	if (cinode->can_cache_brlcks) {
	157	/*
	158	* We can cache brlock requests - simply remove a lock
	159	* from the file's list.
	160	*/
	161	list_del(&li->llist);
	162	cifs_del_lock_waiters(li);
	163	kfree(li);
	164	continue;
	165	}
	166	cur->Length = cpu_to_le64(li->length);
	167	cur->Offset = cpu_to_le64(li->offset);
	168	cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
	169	/*
	170	* We need to save a lock here to let us add it again to the
	171	* file's list if the unlock range request fails on the server.
	172	*/
	173	list_move(&li->llist, &tmp_llist);
	174	if (++num == max_num) {
	175	stored_rc = smb2_lockv(xid, tcon,
	176	cfile->fid.persistent_fid,
	177	cfile->fid.volatile_fid,
	178	current->tgid, num, buf);
	179	if (stored_rc) {
	180	/*
	181	* We failed on the unlock range request - add
	182	* all locks from the tmp list to the head of
	183	* the file's list.
	184	*/
	185	cifs_move_llist(&tmp_llist,
	186	&cfile->llist->locks);
	187	rc = stored_rc;
	188	} else
	189	/*
	190	* The unlock range request succeed - free the
	191	* tmp list.
	192	*/
	193	cifs_free_llist(&tmp_llist);
	194	cur = buf;
	195	num = 0;
	196	} else
	197	cur++;
	198	}
	199	if (num) {
	200	stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
	201	cfile->fid.volatile_fid, current->tgid,
	202	num, buf);
	203	if (stored_rc) {
	204	cifs_move_llist(&tmp_llist, &cfile->llist->locks);
	205	rc = stored_rc;
	206	} else
	207	cifs_free_llist(&tmp_llist);
	208	}
1b4b55a1	209	up_write(&cinode->lock_sem);
f7ba7fe6 PS	210
	211	kfree(buf);
	212	return rc;
	213	}
b140799a PS	214
	215	static int
	216	smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
	217	struct smb2_lock_element *buf, unsigned int max_num)
	218	{
	219	int rc = 0, stored_rc;
	220	struct cifsFileInfo *cfile = fdlocks->cfile;
	221	struct cifsLockInfo *li;
	222	unsigned int num = 0;
	223	struct smb2_lock_element *cur = buf;
	224	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
	225
	226	list_for_each_entry(li, &fdlocks->locks, llist) {
	227	cur->Length = cpu_to_le64(li->length);
	228	cur->Offset = cpu_to_le64(li->offset);
	229	cur->Flags = cpu_to_le32(li->type \|
	230	SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
	231	if (++num == max_num) {
	232	stored_rc = smb2_lockv(xid, tcon,
	233	cfile->fid.persistent_fid,
	234	cfile->fid.volatile_fid,
	235	current->tgid, num, buf);
	236	if (stored_rc)
	237	rc = stored_rc;
	238	cur = buf;
	239	num = 0;
	240	} else
	241	cur++;
	242	}
	243	if (num) {
	244	stored_rc = smb2_lockv(xid, tcon,
	245	cfile->fid.persistent_fid,
	246	cfile->fid.volatile_fid,
	247	current->tgid, num, buf);
	248	if (stored_rc)
	249	rc = stored_rc;
	250	}
	251
	252	return rc;
	253	}
	254
	255	int
	256	smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
	257	{
	258	int rc = 0, stored_rc;
	259	unsigned int xid;
	260	unsigned int max_num, max_buf;
	261	struct smb2_lock_element *buf;
2b0143b5	262	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
b140799a PS	263	struct cifs_fid_locks *fdlocks;
	264
	265	xid = get_xid();
b140799a PS	266
	267	/*
	268	* Accessing maxBuf is racy with cifs_reconnect - need to store value
	269	* and check it for zero before using.
	270	*/
	271	max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
e3d240e9	272	if (max_buf < sizeof(struct smb2_lock_element)) {
b140799a PS	273	free_xid(xid);
	274	return -EINVAL;
	275	}
	276
92a8109e RL	277	BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
92a8109e RL	278	max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
b140799a	279	max_num = max_buf / sizeof(struct smb2_lock_element);
662e9b2b	280	buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
b140799a	281	if (!buf) {
b140799a PS	282	free_xid(xid);
	283	return -ENOMEM;
	284	}
	285
	286	list_for_each_entry(fdlocks, &cinode->llist, llist) {
	287	stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
	288	if (stored_rc)
	289	rc = stored_rc;
	290	}
	291
b140799a	292	kfree(buf);
b140799a PS	293	free_xid(xid);
	294	return rc;
	295	}