[linux-block.git] / fs / nfs / nfs4file.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/nfs/file.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 */
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/nfs_fs.h>
#include <linux/file.h>
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#include "fscache.h"
#include "pnfs.h"

#include "nfstrace.h"

#ifdef CONFIG_NFS_V4_2
#include "nfs42.h"
#endif

#define NFSDBG_FACILITY		NFSDBG_FILE

static int
nfs4_file_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;
	struct dentry *dentry = file_dentry(filp);
	struct dentry *parent = NULL;
	struct inode *dir;
	unsigned openflags = filp->f_flags;
	struct iattr attr;
	int err;

	/*
	 * If no cached dentry exists or if it's negative, NFSv4 handled the
	 * opens in ->lookup() or ->create().
	 *
	 * We only get this far for a cached positive dentry.  We skipped
	 * revalidation, so handle it here by dropping the dentry and returning
	 * -EOPENSTALE.  The VFS will retry the lookup/create/open.
	 */

	dprintk("NFS: open file(%pd2)\n", dentry);

	err = nfs_check_flags(openflags);
	if (err)
		return err;

	if ((openflags & O_ACCMODE) == 3)
		return nfs_open(inode, filp);

	/* We can't create new files here */
	openflags &= ~(O_CREAT|O_EXCL);

	parent = dget_parent(dentry);
	dir = d_inode(parent);

	ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
	err = PTR_ERR(ctx);
	if (IS_ERR(ctx))
		goto out;

	attr.ia_valid = ATTR_OPEN;
	if (openflags & O_TRUNC) {
		attr.ia_valid |= ATTR_SIZE;
		attr.ia_size = 0;
		filemap_write_and_wait(inode->i_mapping);
	}

	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		switch (err) {
		default:
			goto out_put_ctx;
		case -ENOENT:
		case -ESTALE:
		case -EISDIR:
		case -ENOTDIR:
		case -ELOOP:
			goto out_drop;
		}
	}
	if (inode != d_inode(dentry))
		goto out_drop;

	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	nfs_file_set_open_context(filp, ctx);
	nfs_fscache_open_file(inode, filp);
	err = 0;

out_put_ctx:
	put_nfs_open_context(ctx);
out:
	dput(parent);
	return err;

out_drop:
	d_drop(dentry);
	err = -EOPENSTALE;
	goto out_put_ctx;
}

/*
 * Flush all dirty pages, and check for write errors.
 */
static int
nfs4_file_flush(struct file *file, fl_owner_t id)
{
	struct inode	*inode = file_inode(file);

	dprintk("NFS: flush(%pD2)\n", file);

	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
	if ((file->f_mode & FMODE_WRITE) == 0)
		return 0;

	/*
	 * If we're holding a write delegation, then check if we're required
	 * to flush the i/o on close. If not, then just start the i/o now.
	 */
	if (!nfs4_delegation_flush_on_close(inode))
		return filemap_fdatawrite(file->f_mapping);

	/* Flush writes to the server and return any errors */
	return nfs_wb_all(inode);
}

#ifdef CONFIG_NFS_V4_2
static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
				      struct file *file_out, loff_t pos_out,
				      size_t count, unsigned int flags)
{
	struct nfs42_copy_notify_res *cn_resp = NULL;
	struct nl4_server *nss = NULL;
	nfs4_stateid *cnrs = NULL;
	ssize_t ret;

	/* Only offload copy if superblock is the same */
	if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
		return -EXDEV;
	if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
		return -EOPNOTSUPP;
	if (file_inode(file_in) == file_inode(file_out))
		return -EOPNOTSUPP;
	if (!nfs42_files_from_same_server(file_in, file_out)) {
		cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
				GFP_NOFS);
		if (unlikely(cn_resp == NULL))
			return -ENOMEM;

		ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
		if (ret) {
			ret = -EOPNOTSUPP;
			goto out;
		}
		nss = &cn_resp->cnr_src;
		cnrs = &cn_resp->cnr_stateid;
	}
	ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
				nss, cnrs);
out:
	kfree(cn_resp);
	return ret;
}

static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
				    struct file *file_out, loff_t pos_out,
				    size_t count, unsigned int flags)
{
	ssize_t ret;

	ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
				     flags);
	if (ret == -EOPNOTSUPP || ret == -EXDEV)
		ret = generic_copy_file_range(file_in, pos_in, file_out,
					      pos_out, count, flags);
	return ret;
}

static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
{
	loff_t ret;

	switch (whence) {
	case SEEK_HOLE:
	case SEEK_DATA:
		ret = nfs42_proc_llseek(filep, offset, whence);
		if (ret != -ENOTSUPP)
			return ret;
		/* Fall through */
	default:
		return nfs_file_llseek(filep, offset, whence);
	}
}

static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(filep);
	long ret;

	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
		return -EOPNOTSUPP;

	ret = inode_newsize_ok(inode, offset + len);
	if (ret < 0)
		return ret;

	if (mode & FALLOC_FL_PUNCH_HOLE)
		return nfs42_proc_deallocate(filep, offset, len);
	return nfs42_proc_allocate(filep, offset, len);
}

static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
		struct file *dst_file, loff_t dst_off, loff_t count,
		unsigned int remap_flags)
{
	struct inode *dst_inode = file_inode(dst_file);
	struct nfs_server *server = NFS_SERVER(dst_inode);
	struct inode *src_inode = file_inode(src_file);
	unsigned int bs = server->clone_blksize;
	bool same_inode = false;
	int ret;

	/* NFS does not support deduplication. */
	if (remap_flags & REMAP_FILE_DEDUP)
		return -EOPNOTSUPP;

	if (remap_flags & ~REMAP_FILE_ADVISORY)
		return -EINVAL;

	/* check alignment w.r.t. clone_blksize */
	ret = -EINVAL;
	if (bs) {
		if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
			goto out;
		if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
			goto out;
	}

	if (src_inode == dst_inode)
		same_inode = true;

	/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
	if (same_inode) {
		inode_lock(src_inode);
	} else if (dst_inode < src_inode) {
		inode_lock_nested(dst_inode, I_MUTEX_PARENT);
		inode_lock_nested(src_inode, I_MUTEX_CHILD);
	} else {
		inode_lock_nested(src_inode, I_MUTEX_PARENT);
		inode_lock_nested(dst_inode, I_MUTEX_CHILD);
	}

	/* flush all pending writes on both src and dst so that server
	 * has the latest data */
	ret = nfs_sync_inode(src_inode);
	if (ret)
		goto out_unlock;
	ret = nfs_sync_inode(dst_inode);
	if (ret)
		goto out_unlock;

	ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);

	/* truncate inode page cache of the dst range so that future reads can fetch
	 * new data from server */
	if (!ret)
		truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);

out_unlock:
	if (same_inode) {
		inode_unlock(src_inode);
	} else if (dst_inode < src_inode) {
		inode_unlock(src_inode);
		inode_unlock(dst_inode);
	} else {
		inode_unlock(dst_inode);
		inode_unlock(src_inode);
	}
out:
	return ret < 0 ? ret : count;
}

static int read_name_gen = 1;
#define SSC_READ_NAME_BODY "ssc_read_%d"

struct file *
nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh,
		nfs4_stateid *stateid)
{
	struct nfs_fattr fattr;
	struct file *filep, *res;
	struct nfs_server *server;
	struct inode *r_ino = NULL;
	struct nfs_open_context *ctx;
	struct nfs4_state_owner *sp;
	char *read_name;
	int len, status = 0;

	server = NFS_SERVER(ss_mnt->mnt_root->d_inode);

	nfs_fattr_init(&fattr);

	status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
	if (status < 0) {
		res = ERR_PTR(status);
		goto out;
	}

	res = ERR_PTR(-ENOMEM);
	len = strlen(SSC_READ_NAME_BODY) + 16;
	read_name = kzalloc(len, GFP_NOFS);
	if (read_name == NULL)
		goto out;
	snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);

	r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
			NULL);
	if (IS_ERR(r_ino)) {
		res = ERR_CAST(r_ino);
		goto out;
	}

	filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
				     r_ino->i_fop);
	if (IS_ERR(filep)) {
		res = ERR_CAST(filep);
		goto out;
	}
	filep->f_mode |= FMODE_READ;

	ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
					filep);
	if (IS_ERR(ctx)) {
		res = ERR_CAST(ctx);
		goto out_filep;
	}

	res = ERR_PTR(-EINVAL);
	sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
	if (sp == NULL)
		goto out_ctx;

	ctx->state = nfs4_get_open_state(r_ino, sp);
	if (ctx->state == NULL)
		goto out_stateowner;

	set_bit(NFS_OPEN_STATE, &ctx->state->flags);
	memcpy(&ctx->state->open_stateid.other, &stateid->other,
	       NFS4_STATEID_OTHER_SIZE);
	update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);

	nfs_file_set_open_context(filep, ctx);
	put_nfs_open_context(ctx);

	file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
	res = filep;
out:
	return res;
out_stateowner:
	nfs4_put_state_owner(sp);
out_ctx:
	put_nfs_open_context(ctx);
out_filep:
	fput(filep);
	goto out;
}
EXPORT_SYMBOL_GPL(nfs42_ssc_open);
void nfs42_ssc_close(struct file *filep)
{
	struct nfs_open_context *ctx = nfs_file_open_context(filep);

	ctx->state->flags = 0;
}
EXPORT_SYMBOL_GPL(nfs42_ssc_close);
#endif /* CONFIG_NFS_V4_2 */

const struct file_operations nfs4_file_operations = {
	.read_iter	= nfs_file_read,
	.write_iter	= nfs_file_write,
	.mmap		= nfs_file_mmap,
	.open		= nfs4_file_open,
	.flush		= nfs4_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.check_flags	= nfs_check_flags,
	.setlease	= simple_nosetlease,
#ifdef CONFIG_NFS_V4_2
	.copy_file_range = nfs4_copy_file_range,
	.llseek		= nfs4_file_llseek,
	.fallocate	= nfs42_fallocate,
	.remap_file_range = nfs42_remap_file_range,
#else
	.llseek		= nfs_file_llseek,
#endif
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
ce4ef7c0 BS	2	/*
	3	* linux/fs/nfs/file.c
	4	*
	5	* Copyright (C) 1992 Rick Sladkey
	6	*/
f4ac1674	7	#include <linux/fs.h>
bea51b30	8	#include <linux/file.h>
f4ac1674	9	#include <linux/falloc.h>
ce4ef7c0	10	#include <linux/nfs_fs.h>
ec4b0925	11	#include <linux/file.h>
5445b1fb	12	#include "delegation.h"
ce4ef7c0	13	#include "internal.h"
5445b1fb	14	#include "iostat.h"
a4ff1468	15	#include "fscache.h"
ce4ef7c0 BS	16	#include "pnfs.h"
ce4ef7c0 BS	17
81b79afb TM	18	#include "nfstrace.h"
81b79afb TM	19
1c6dcbe5 AS	20	#ifdef CONFIG_NFS_V4_2
	21	#include "nfs42.h"
	22	#endif
	23
ce4ef7c0 BS	24	#define NFSDBG_FACILITY NFSDBG_FILE
	25
	26	static int
	27	nfs4_file_open(struct inode inode, struct file filp)
	28	{
	29	struct nfs_open_context *ctx;
be62a1a8	30	struct dentry *dentry = file_dentry(filp);
ce4ef7c0 BS	31	struct dentry *parent = NULL;
	32	struct inode *dir;
	33	unsigned openflags = filp->f_flags;
	34	struct iattr attr;
	35	int err;
	36
ce4ef7c0 BS	37	/*
	38	* If no cached dentry exists or if it's negative, NFSv4 handled the
	39	* opens in ->lookup() or ->create().
	40	*
	41	* We only get this far for a cached positive dentry. We skipped
	42	* revalidation, so handle it here by dropping the dentry and returning
	43	* -EOPENSTALE. The VFS will retry the lookup/create/open.
	44	*/
	45
6de1472f	46	dprintk("NFS: open file(%pd2)\n", dentry);
ce4ef7c0	47
18a60089 BC	48	err = nfs_check_flags(openflags);
	49	if (err)
	50	return err;
	51
ce4ef7c0	52	if ((openflags & O_ACCMODE) == 3)
44942b4e	53	return nfs_open(inode, filp);
ce4ef7c0 BS	54
	55	/* We can't create new files here */
	56	openflags &= ~(O_CREAT\|O_EXCL);
	57
	58	parent = dget_parent(dentry);
2b0143b5	59	dir = d_inode(parent);
ce4ef7c0	60
532d4def	61	ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
ce4ef7c0 BS	62	err = PTR_ERR(ctx);
	63	if (IS_ERR(ctx))
	64	goto out;
	65
	66	attr.ia_valid = ATTR_OPEN;
	67	if (openflags & O_TRUNC) {
	68	attr.ia_valid \|= ATTR_SIZE;
	69	attr.ia_size = 0;
8b7d9d09	70	filemap_write_and_wait(inode->i_mapping);
ce4ef7c0 BS	71	}
ce4ef7c0 BS	72
c5c3fb5f	73	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
ce4ef7c0 BS	74	if (IS_ERR(inode)) {
	75	err = PTR_ERR(inode);
	76	switch (err) {
ce4ef7c0	77	default:
90cf500e TM	78	goto out_put_ctx;
	79	case -ENOENT:
	80	case -ESTALE:
	81	case -EISDIR:
	82	case -ENOTDIR:
	83	case -ELOOP:
ce4ef7c0 BS	84	goto out_drop;
	85	}
	86	}
2b0143b5	87	if (inode != d_inode(dentry))
ce4ef7c0 BS	88	goto out_drop;
	89
	90	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	91	nfs_file_set_open_context(filp, ctx);
f1fe29b4	92	nfs_fscache_open_file(inode, filp);
ce4ef7c0 BS	93	err = 0;
	94
	95	out_put_ctx:
	96	put_nfs_open_context(ctx);
	97	out:
	98	dput(parent);
	99	return err;
	100
	101	out_drop:
	102	d_drop(dentry);
	103	err = -EOPENSTALE;
	104	goto out_put_ctx;
	105	}
	106
5445b1fb TM	107	/*
	108	* Flush all dirty pages, and check for write errors.
	109	*/
	110	static int
	111	nfs4_file_flush(struct file *file, fl_owner_t id)
	112	{
	113	struct inode *inode = file_inode(file);
	114
	115	dprintk("NFS: flush(%pD2)\n", file);
	116
	117	nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
	118	if ((file->f_mode & FMODE_WRITE) == 0)
	119	return 0;
	120
	121	/*
	122	* If we're holding a write delegation, then check if we're required
	123	* to flush the i/o on close. If not, then just start the i/o now.
	124	*/
	125	if (!nfs4_delegation_flush_on_close(inode))
	126	return filemap_fdatawrite(file->f_mapping);
	127
	128	/* Flush writes to the server and return any errors */
aded8d7b	129	return nfs_wb_all(inode);
5445b1fb TM	130	}
5445b1fb TM	131
1c6dcbe5	132	#ifdef CONFIG_NFS_V4_2
64bf5ff5 DC	133	static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
	134	struct file *file_out, loff_t pos_out,
	135	size_t count, unsigned int flags)
2e72448b	136	{
0491567b	137	struct nfs42_copy_notify_res *cn_resp = NULL;
1d38f3f0 OK	138	struct nl4_server *nss = NULL;
1d38f3f0 OK	139	nfs4_stateid *cnrs = NULL;
0491567b OK	140	ssize_t ret;
0491567b OK	141
5dae222a AG	142	/* Only offload copy if superblock is the same */
	143	if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
	144	return -EXDEV;
0769663b OK	145	if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
0769663b OK	146	return -EOPNOTSUPP;
837bb1d7	147	if (file_inode(file_in) == file_inode(file_out))
0769663b	148	return -EOPNOTSUPP;
0491567b OK	149	if (!nfs42_files_from_same_server(file_in, file_out)) {
	150	cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
	151	GFP_NOFS);
	152	if (unlikely(cn_resp == NULL))
	153	return -ENOMEM;
	154
	155	ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
	156	if (ret) {
	157	ret = -EOPNOTSUPP;
	158	goto out;
	159	}
1d38f3f0 OK	160	nss = &cn_resp->cnr_src;
1d38f3f0 OK	161	cnrs = &cn_resp->cnr_stateid;
0491567b	162	}
1d38f3f0 OK	163	ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
1d38f3f0 OK	164	nss, cnrs);
0491567b OK	165	out:
	166	kfree(cn_resp);
	167	return ret;
2e72448b AS	168	}
2e72448b AS	169
64bf5ff5 DC	170	static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
	171	struct file *file_out, loff_t pos_out,
	172	size_t count, unsigned int flags)
	173	{
	174	ssize_t ret;
	175
	176	ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
	177	flags);
5dae222a	178	if (ret == -EOPNOTSUPP \|\| ret == -EXDEV)
64bf5ff5 DC	179	ret = generic_copy_file_range(file_in, pos_in, file_out,
	180	pos_out, count, flags);
	181	return ret;
	182	}
	183
1c6dcbe5 AS	184	static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
	185	{
	186	loff_t ret;
	187
	188	switch (whence) {
	189	case SEEK_HOLE:
	190	case SEEK_DATA:
	191	ret = nfs42_proc_llseek(filep, offset, whence);
	192	if (ret != -ENOTSUPP)
	193	return ret;
01e03bdc	194	/* Fall through */
1c6dcbe5 AS	195	default:
	196	return nfs_file_llseek(filep, offset, whence);
	197	}
	198	}
f4ac1674 AS	199
	200	static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
	201	{
	202	struct inode *inode = file_inode(filep);
	203	long ret;
	204
	205	if (!S_ISREG(inode->i_mode))
	206	return -EOPNOTSUPP;
	207
624bd5b7	208	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE \| FALLOC_FL_KEEP_SIZE)))
f4ac1674 AS	209	return -EOPNOTSUPP;
	210
	211	ret = inode_newsize_ok(inode, offset + len);
	212	if (ret < 0)
	213	return ret;
	214
624bd5b7	215	if (mode & FALLOC_FL_PUNCH_HOLE)
f830f7dd AS	216	return nfs42_proc_deallocate(filep, offset, len);
f830f7dd AS	217	return nfs42_proc_allocate(filep, offset, len);
f4ac1674	218	}
bea51b30	219
42ec3d4c DW	220	static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
42ec3d4c DW	221	struct file *dst_file, loff_t dst_off, loff_t count,
2e5dfc99	222	unsigned int remap_flags)
bea51b30 PT	223	{
bea51b30 PT	224	struct inode *dst_inode = file_inode(dst_file);
811b7b85	225	struct nfs_server *server = NFS_SERVER(dst_inode);
04b38d60	226	struct inode *src_inode = file_inode(src_file);
811b7b85	227	unsigned int bs = server->clone_blksize;
21fad313	228	bool same_inode = false;
bea51b30 PT	229	int ret;
bea51b30 PT	230
9026b3a9 DW	231	/* NFS does not support deduplication. */
	232	if (remap_flags & REMAP_FILE_DEDUP)
	233	return -EOPNOTSUPP;
	234
	235	if (remap_flags & ~REMAP_FILE_ADVISORY)
2e5dfc99 DW	236	return -EINVAL;
2e5dfc99 DW	237
811b7b85 PT	238	/* check alignment w.r.t. clone_blksize */
	239	ret = -EINVAL;
	240	if (bs) {
	241	if (!IS_ALIGNED(src_off, bs) \|\| !IS_ALIGNED(dst_off, bs))
04b38d60	242	goto out;
811b7b85	243	if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
04b38d60	244	goto out;
811b7b85 PT	245	}
811b7b85 PT	246
04b38d60 CH	247	if (src_inode == dst_inode)
04b38d60 CH	248	same_inode = true;
21fad313	249
bea51b30	250	/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
21fad313	251	if (same_inode) {
5955102c	252	inode_lock(src_inode);
21fad313	253	} else if (dst_inode < src_inode) {
5955102c AV	254	inode_lock_nested(dst_inode, I_MUTEX_PARENT);
5955102c AV	255	inode_lock_nested(src_inode, I_MUTEX_CHILD);
bea51b30	256	} else {
5955102c AV	257	inode_lock_nested(src_inode, I_MUTEX_PARENT);
5955102c AV	258	inode_lock_nested(dst_inode, I_MUTEX_CHILD);
bea51b30 PT	259	}
	260
	261	/* flush all pending writes on both src and dst so that server
	262	* has the latest data */
	263	ret = nfs_sync_inode(src_inode);
	264	if (ret)
	265	goto out_unlock;
	266	ret = nfs_sync_inode(dst_inode);
	267	if (ret)
	268	goto out_unlock;
	269
04b38d60	270	ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
bea51b30 PT	271
	272	/* truncate inode page cache of the dst range so that future reads can fetch
	273	* new data from server */
	274	if (!ret)
	275	truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
	276
	277	out_unlock:
21fad313	278	if (same_inode) {
5955102c	279	inode_unlock(src_inode);
21fad313	280	} else if (dst_inode < src_inode) {
5955102c AV	281	inode_unlock(src_inode);
5955102c AV	282	inode_unlock(dst_inode);
bea51b30	283	} else {
5955102c AV	284	inode_unlock(dst_inode);
5955102c AV	285	inode_unlock(src_inode);
bea51b30	286	}
04b38d60	287	out:
42ec3d4c	288	return ret < 0 ? ret : count;
bea51b30	289	}
ec4b0925 OK	290
	291	static int read_name_gen = 1;
	292	#define SSC_READ_NAME_BODY "ssc_read_%d"
	293
	294	struct file *
	295	nfs42_ssc_open(struct vfsmount ss_mnt, struct nfs_fh src_fh,
	296	nfs4_stateid *stateid)
	297	{
	298	struct nfs_fattr fattr;
	299	struct file filep, res;
	300	struct nfs_server *server;
	301	struct inode *r_ino = NULL;
	302	struct nfs_open_context *ctx;
	303	struct nfs4_state_owner *sp;
	304	char *read_name;
	305	int len, status = 0;
	306
	307	server = NFS_SERVER(ss_mnt->mnt_root->d_inode);
	308
	309	nfs_fattr_init(&fattr);
	310
	311	status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
	312	if (status < 0) {
	313	res = ERR_PTR(status);
	314	goto out;
	315	}
	316
	317	res = ERR_PTR(-ENOMEM);
	318	len = strlen(SSC_READ_NAME_BODY) + 16;
	319	read_name = kzalloc(len, GFP_NOFS);
	320	if (read_name == NULL)
	321	goto out;
	322	snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
	323
	324	r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
	325	NULL);
	326	if (IS_ERR(r_ino)) {
	327	res = ERR_CAST(r_ino);
	328	goto out;
	329	}
	330
	331	filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
	332	r_ino->i_fop);
	333	if (IS_ERR(filep)) {
	334	res = ERR_CAST(filep);
	335	goto out;
	336	}
	337	filep->f_mode \|= FMODE_READ;
	338
	339	ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
	340	filep);
	341	if (IS_ERR(ctx)) {
	342	res = ERR_CAST(ctx);
	343	goto out_filep;
	344	}
	345
	346	res = ERR_PTR(-EINVAL);
	347	sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
	348	if (sp == NULL)
	349	goto out_ctx;
	350
	351	ctx->state = nfs4_get_open_state(r_ino, sp);
	352	if (ctx->state == NULL)
	353	goto out_stateowner;
354
355	set_bit(NFS_OPEN_STATE, &ctx->state->flags);
356	memcpy(&ctx->state->open_stateid.other, &stateid->other,
357	NFS4_STATEID_OTHER_SIZE);
358	update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
359
360	nfs_file_set_open_context(filep, ctx);
361	put_nfs_open_context(ctx);
362
363	file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
364	res = filep;
365	out:
366	return res;
367	out_stateowner:
368	nfs4_put_state_owner(sp);
369	out_ctx:
370	put_nfs_open_context(ctx);
371	out_filep:
372	fput(filep);
373	goto out;
374	}
375	EXPORT_SYMBOL_GPL(nfs42_ssc_open);
376	void nfs42_ssc_close(struct file *filep)
377	{
378	struct nfs_open_context *ctx = nfs_file_open_context(filep);
379
380	ctx->state->flags = 0;
381	}
382	EXPORT_SYMBOL_GPL(nfs42_ssc_close);
6b7153da	383	#endif /* CONFIG_NFS_V4_2 */
bea51b30	384
ce4ef7c0	385	const struct file_operations nfs4_file_operations = {
3aa2d199	386	.read_iter = nfs_file_read,
edaf4369	387	.write_iter = nfs_file_write,
ce4ef7c0 BS	388	.mmap = nfs_file_mmap,
ce4ef7c0 BS	389	.open = nfs4_file_open,
5445b1fb	390	.flush = nfs4_file_flush,
ce4ef7c0	391	.release = nfs_file_release,
4ff79bc7	392	.fsync = nfs_file_fsync,
ce4ef7c0 BS	393	.lock = nfs_lock,
ce4ef7c0 BS	394	.flock = nfs_flock,
82c156f8	395	.splice_read = generic_file_splice_read,
4da54c21	396	.splice_write = iter_file_splice_write,
ce4ef7c0	397	.check_flags = nfs_check_flags,
1c994a09	398	.setlease = simple_nosetlease,
6b7153da	399	#ifdef CONFIG_NFS_V4_2
2e72448b	400	.copy_file_range = nfs4_copy_file_range,
6b7153da CH	401	.llseek = nfs4_file_llseek,
6b7153da CH	402	.fallocate = nfs42_fallocate,
2e5dfc99	403	.remap_file_range = nfs42_remap_file_range,
6b7153da CH	404	#else
	405	.llseek = nfs_file_llseek,
	406	#endif
ce4ef7c0	407	};