[linux-block.git] / fs / 9p / vfs_super.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/9p/vfs_super.c
 *
 * This file contians superblock ops for 9P2000. It is intended that
 * you mount this file system on directories.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/magic.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"
#include "xattr.h"
#include "acl.h"

static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;

/**
 * v9fs_set_super - set the superblock
 * @s: super block
 * @data: file system specific data
 *
 */

static int v9fs_set_super(struct super_block *s, void *data)
{
	s->s_fs_info = data;
	return set_anon_super(s, data);
}

/**
 * v9fs_fill_super - populate superblock with info
 * @sb: superblock
 * @v9ses: session information
 * @flags: flags propagated from v9fs_mount()
 *
 */

static int
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
		int flags)
{
	int ret;

	sb->s_maxbytes = MAX_LFS_FILESIZE;
	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	sb->s_magic = V9FS_MAGIC;
	if (v9fs_proto_dotl(v9ses)) {
		sb->s_op = &v9fs_super_ops_dotl;
		sb->s_xattr = v9fs_xattr_handlers;
	} else {
		sb->s_op = &v9fs_super_ops;
		sb->s_time_max = U32_MAX;
	}

	sb->s_time_min = 0;

	ret = super_setup_bdi(sb);
	if (ret)
		return ret;

	if (!v9ses->cache) {
		sb->s_bdi->ra_pages = 0;
		sb->s_bdi->io_pages = 0;
	}

	sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
	if (!v9ses->cache)
		sb->s_flags |= SB_SYNCHRONOUS;

#ifdef CONFIG_9P_FS_POSIX_ACL
	if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
		sb->s_flags |= SB_POSIXACL;
#endif

	return 0;
}

/**
 * v9fs_mount - mount a superblock
 * @fs_type: file system type
 * @flags: mount flags
 * @dev_name: device name that was mounted
 * @data: mount options
 *
 */

static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
{
	struct super_block *sb = NULL;
	struct inode *inode = NULL;
	struct dentry *root = NULL;
	struct v9fs_session_info *v9ses = NULL;
	umode_t mode = S_IRWXUGO | S_ISVTX;
	struct p9_fid *fid;
	int retval = 0;

	p9_debug(P9_DEBUG_VFS, "\n");

	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
	if (!v9ses)
		return ERR_PTR(-ENOMEM);

	fid = v9fs_session_init(v9ses, dev_name, data);
	if (IS_ERR(fid)) {
		retval = PTR_ERR(fid);
		goto free_session;
	}

	sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
	if (IS_ERR(sb)) {
		retval = PTR_ERR(sb);
		goto clunk_fid;
	}
	retval = v9fs_fill_super(sb, v9ses, flags);
	if (retval)
		goto release_sb;

	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
		sb->s_d_op = &v9fs_cached_dentry_operations;
	else
		sb->s_d_op = &v9fs_dentry_operations;

	inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
	if (IS_ERR(inode)) {
		retval = PTR_ERR(inode);
		goto release_sb;
	}

	root = d_make_root(inode);
	if (!root) {
		retval = -ENOMEM;
		goto release_sb;
	}
	sb->s_root = root;
	if (v9fs_proto_dotl(v9ses)) {
		struct p9_stat_dotl *st = NULL;
		st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
		if (IS_ERR(st)) {
			retval = PTR_ERR(st);
			goto release_sb;
		}
		d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
		v9fs_stat2inode_dotl(st, d_inode(root), 0);
		kfree(st);
	} else {
		struct p9_wstat *st = NULL;
		st = p9_client_stat(fid);
		if (IS_ERR(st)) {
			retval = PTR_ERR(st);
			goto release_sb;
		}

		d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
		v9fs_stat2inode(st, d_inode(root), sb, 0);

		p9stat_free(st);
		kfree(st);
	}
	retval = v9fs_get_acl(inode, fid);
	if (retval)
		goto release_sb;
	v9fs_fid_add(root, fid);

	p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
	return dget(sb->s_root);

clunk_fid:
	p9_client_clunk(fid);
	v9fs_session_close(v9ses);
free_session:
	kfree(v9ses);
	return ERR_PTR(retval);

release_sb:
	/*
	 * we will do the session_close and root dentry release
	 * in the below call. But we need to clunk fid, because we haven't
	 * attached the fid to dentry so it won't get clunked
	 * automatically.
	 */
	p9_client_clunk(fid);
	deactivate_locked_super(sb);
	return ERR_PTR(retval);
}

/**
 * v9fs_kill_super - Kill Superblock
 * @s: superblock
 *
 */

static void v9fs_kill_super(struct super_block *s)
{
	struct v9fs_session_info *v9ses = s->s_fs_info;

	p9_debug(P9_DEBUG_VFS, " %p\n", s);

	kill_anon_super(s);

	v9fs_session_cancel(v9ses);
	v9fs_session_close(v9ses);
	kfree(v9ses);
	s->s_fs_info = NULL;
	p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
}

static void
v9fs_umount_begin(struct super_block *sb)
{
	struct v9fs_session_info *v9ses;

	v9ses = sb->s_fs_info;
	v9fs_session_begin_cancel(v9ses);
}

static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_rstatfs rs;
	int res;

	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid)) {
		res = PTR_ERR(fid);
		goto done;
	}

	v9ses = v9fs_dentry2v9ses(dentry);
	if (v9fs_proto_dotl(v9ses)) {
		res = p9_client_statfs(fid, &rs);
		if (res == 0) {
			buf->f_type = rs.type;
			buf->f_bsize = rs.bsize;
			buf->f_blocks = rs.blocks;
			buf->f_bfree = rs.bfree;
			buf->f_bavail = rs.bavail;
			buf->f_files = rs.files;
			buf->f_ffree = rs.ffree;
			buf->f_fsid = u64_to_fsid(rs.fsid);
			buf->f_namelen = rs.namelen;
		}
		if (res != -ENOSYS)
			goto done;
	}
	res = simple_statfs(dentry, buf);
done:
	p9_client_clunk(fid);
	return res;
}

static int v9fs_drop_inode(struct inode *inode)
{
	struct v9fs_session_info *v9ses;
	v9ses = v9fs_inode2v9ses(inode);
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
		return generic_drop_inode(inode);
	/*
	 * in case of non cached mode always drop the
	 * the inode because we want the inode attribute
	 * to always match that on the server.
	 */
	return 1;
}

static int v9fs_write_inode(struct inode *inode,
			    struct writeback_control *wbc)
{
	int ret;
	struct p9_wstat wstat;
	struct v9fs_inode *v9inode;
	/*
	 * send an fsync request to server irrespective of
	 * wbc->sync_mode.
	 */
	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
	v9inode = V9FS_I(inode);
	if (!v9inode->writeback_fid)
		return 0;
	v9fs_blank_wstat(&wstat);

	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
	if (ret < 0) {
		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
		return ret;
	}
	return 0;
}

static int v9fs_write_inode_dotl(struct inode *inode,
				 struct writeback_control *wbc)
{
	int ret;
	struct v9fs_inode *v9inode;
	/*
	 * send an fsync request to server irrespective of
	 * wbc->sync_mode.
	 */
	v9inode = V9FS_I(inode);
	p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
		 __func__, inode, v9inode->writeback_fid);
	if (!v9inode->writeback_fid)
		return 0;

	ret = p9_client_fsync(v9inode->writeback_fid, 0);
	if (ret < 0) {
		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
		return ret;
	}
	return 0;
}

static const struct super_operations v9fs_super_ops = {
	.alloc_inode = v9fs_alloc_inode,
	.free_inode = v9fs_free_inode,
	.statfs = simple_statfs,
	.evict_inode = v9fs_evict_inode,
	.show_options = v9fs_show_options,
	.umount_begin = v9fs_umount_begin,
	.write_inode = v9fs_write_inode,
};

static const struct super_operations v9fs_super_ops_dotl = {
	.alloc_inode = v9fs_alloc_inode,
	.free_inode = v9fs_free_inode,
	.statfs = v9fs_statfs,
	.drop_inode = v9fs_drop_inode,
	.evict_inode = v9fs_evict_inode,
	.show_options = v9fs_show_options,
	.umount_begin = v9fs_umount_begin,
	.write_inode = v9fs_write_inode_dotl,
};

struct file_system_type v9fs_fs_type = {
	.name = "9p",
	.mount = v9fs_mount,
	.kill_sb = v9fs_kill_super,
	.owner = THIS_MODULE,
	.fs_flags = FS_RENAME_DOES_D_MOVE,
};
MODULE_ALIAS_FS("9p");
Commit	Line	Data
1f327613	1	// SPDX-License-Identifier: GPL-2.0-only
9e82cf6a EVH	2	/*
	3	* linux/fs/9p/vfs_super.c
	4	*
	5	* This file contians superblock ops for 9P2000. It is intended that
	6	* you mount this file system on directories.
	7	*
	8	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	9	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9e82cf6a EVH	10	*/
	11
	12	#include <linux/kernel.h>
9e82cf6a EVH	13	#include <linux/module.h>
	14	#include <linux/errno.h>
	15	#include <linux/fs.h>
	16	#include <linux/file.h>
	17	#include <linux/stat.h>
	18	#include <linux/string.h>
9e82cf6a EVH	19	#include <linux/inet.h>
9e82cf6a EVH	20	#include <linux/pagemap.h>
9e82cf6a EVH	21	#include <linux/mount.h>
9e82cf6a EVH	22	#include <linux/idr.h>
e8edc6e0	23	#include <linux/sched.h>
5a0e3ad6	24	#include <linux/slab.h>
bda8e775	25	#include <linux/statfs.h>
368c09d2	26	#include <linux/magic.h>
bd238fb4 LI	27	#include <net/9p/9p.h>
bd238fb4 LI	28	#include <net/9p/client.h>
9e82cf6a	29
9e82cf6a	30	#include "v9fs.h"
9e82cf6a	31	#include "v9fs_vfs.h"
9e82cf6a	32	#include "fid.h"
ebf46264	33	#include "xattr.h"
85ff872d	34	#include "acl.h"
9e82cf6a	35
9b6533c9	36	static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
9e82cf6a	37
9e82cf6a EVH	38	/**
	39	* v9fs_set_super - set the superblock
	40	* @s: super block
	41	* @data: file system specific data
	42	*
	43	*/
	44
	45	static int v9fs_set_super(struct super_block s, void data)
	46	{
	47	s->s_fs_info = data;
	48	return set_anon_super(s, data);
	49	}
	50
	51	/**
	52	* v9fs_fill_super - populate superblock with info
	53	* @sb: superblock
	54	* @v9ses: session information
d2d1ea93	55	* @flags: flags propagated from v9fs_mount()
9e82cf6a EVH	56	*
	57	*/
	58
71304feb	59	static int
9e82cf6a	60	v9fs_fill_super(struct super_block sb, struct v9fs_session_info v9ses,
aafee43b	61	int flags)
9e82cf6a	62	{
71304feb JK	63	int ret;
71304feb JK	64
9e82cf6a EVH	65	sb->s_maxbytes = MAX_LFS_FILESIZE;
	66	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
	67	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	68	sb->s_magic = V9FS_MAGIC;
ebf46264	69	if (v9fs_proto_dotl(v9ses)) {
9b6533c9	70	sb->s_op = &v9fs_super_ops_dotl;
ebf46264	71	sb->s_xattr = v9fs_xattr_handlers;
d5c6e2d5	72	} else {
9b6533c9	73	sb->s_op = &v9fs_super_ops;
d5c6e2d5 DD	74	sb->s_time_max = U32_MAX;
	75	}
	76
	77	sb->s_time_min = 0;
71304feb JK	78
	79	ret = super_setup_bdi(sb);
	80	if (ret)
	81	return ret;
	82
55b2598e CH	83	if (!v9ses->cache) {
	84	sb->s_bdi->ra_pages = 0;
	85	sb->s_bdi->io_pages = 0;
	86	}
9e82cf6a	87
7ff3c204	88	sb->s_flags \|= SB_ACTIVE \| SB_DIRSYNC;
db5841d4	89	if (!v9ses->cache)
1751e8a6	90	sb->s_flags \|= SB_SYNCHRONOUS;
4b53e4b5	91
85ff872d	92	#ifdef CONFIG_9P_FS_POSIX_ACL
e782ef71	93	if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
1751e8a6	94	sb->s_flags \|= SB_POSIXACL;
85ff872d AK	95	#endif
85ff872d AK	96
71304feb	97	return 0;
9e82cf6a EVH	98	}
	99
	100	/**
d2d1ea93	101	* v9fs_mount - mount a superblock
9e82cf6a EVH	102	* @fs_type: file system type
	103	* @flags: mount flags
	104	* @dev_name: device name that was mounted
	105	* @data: mount options
	106	*
	107	*/
	108
d2d1ea93 AV	109	static struct dentry v9fs_mount(struct file_system_type fs_type, int flags,
d2d1ea93 AV	110	const char dev_name, void data)
9e82cf6a EVH	111	{
9e82cf6a EVH	112	struct super_block *sb = NULL;
9e82cf6a EVH	113	struct inode *inode = NULL;
	114	struct dentry *root = NULL;
	115	struct v9fs_session_info *v9ses = NULL;
3eda0de6	116	umode_t mode = S_IRWXUGO \| S_ISVTX;
bd238fb4	117	struct p9_fid *fid;
9e82cf6a EVH	118	int retval = 0;
9e82cf6a EVH	119
5d385153	120	p9_debug(P9_DEBUG_VFS, "\n");
9e82cf6a	121
1dac06b2	122	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
9e82cf6a	123	if (!v9ses)
d2d1ea93	124	return ERR_PTR(-ENOMEM);
9e82cf6a	125
bd238fb4 LI	126	fid = v9fs_session_init(v9ses, dev_name, data);
	127	if (IS_ERR(fid)) {
	128	retval = PTR_ERR(fid);
412a19b6	129	goto free_session;
bd238fb4 LI	130	}
bd238fb4 LI	131
9249e17f	132	sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
454e2398 DH	133	if (IS_ERR(sb)) {
454e2398 DH	134	retval = PTR_ERR(sb);
f0853122	135	goto clunk_fid;
454e2398	136	}
aafee43b	137	retval = v9fs_fill_super(sb, v9ses, flags);
71304feb JK	138	if (retval)
71304feb JK	139	goto release_sb;
9e82cf6a	140
fb89b45c	141	if (v9ses->cache == CACHE_LOOSE \|\| v9ses->cache == CACHE_FSCACHE)
98cd3fb0 AV	142	sb->s_d_op = &v9fs_cached_dentry_operations;
	143	else
	144	sb->s_d_op = &v9fs_dentry_operations;
	145
45089142	146	inode = v9fs_get_inode(sb, S_IFDIR \| mode, 0);
9e82cf6a EVH	147	if (IS_ERR(inode)) {
9e82cf6a EVH	148	retval = PTR_ERR(inode);
887b3ece	149	goto release_sb;
9e82cf6a	150	}
df5d8c80	151
48fde701	152	root = d_make_root(inode);
9e82cf6a EVH	153	if (!root) {
9e82cf6a EVH	154	retval = -ENOMEM;
887b3ece	155	goto release_sb;
9e82cf6a	156	}
9e82cf6a	157	sb->s_root = root;
f0853122 SK	158	if (v9fs_proto_dotl(v9ses)) {
	159	struct p9_stat_dotl *st = NULL;
	160	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
	161	if (IS_ERR(st)) {
	162	retval = PTR_ERR(st);
5c25f347	163	goto release_sb;
f0853122	164	}
2b0143b5	165	d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
5e3cc1ee	166	v9fs_stat2inode_dotl(st, d_inode(root), 0);
f0853122 SK	167	kfree(st);
	168	} else {
	169	struct p9_wstat *st = NULL;
	170	st = p9_client_stat(fid);
	171	if (IS_ERR(st)) {
	172	retval = PTR_ERR(st);
5c25f347	173	goto release_sb;
f0853122 SK	174	}
f0853122 SK	175
2b0143b5	176	d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
5e3cc1ee	177	v9fs_stat2inode(st, d_inode(root), sb, 0);
f0853122 SK	178
	179	p9stat_free(st);
	180	kfree(st);
	181	}
85ff872d AK	182	retval = v9fs_get_acl(inode, fid);
	183	if (retval)
	184	goto release_sb;
df5d8c80	185	v9fs_fid_add(root, fid);
9e82cf6a	186
5d385153	187	p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
d2d1ea93	188	return dget(sb->s_root);
9e82cf6a	189
887b3ece EVH	190	clunk_fid:
887b3ece EVH	191	p9_client_clunk(fid);
887b3ece	192	v9fs_session_close(v9ses);
412a19b6	193	free_session:
887b3ece	194	kfree(v9ses);
d2d1ea93	195	return ERR_PTR(retval);
df5d8c80	196
1b5ab3e8	197	release_sb:
5c25f347	198	/*
df5d8c80 AK	199	* we will do the session_close and root dentry release
	200	* in the below call. But we need to clunk fid, because we haven't
	201	* attached the fid to dentry so it won't get clunked
	202	* automatically.
5c25f347	203	*/
df5d8c80	204	p9_client_clunk(fid);
1b5ab3e8	205	deactivate_locked_super(sb);
d2d1ea93	206	return ERR_PTR(retval);
9e82cf6a EVH	207	}
	208
	209	/**
	210	* v9fs_kill_super - Kill Superblock
	211	* @s: superblock
	212	*
	213	*/
	214
	215	static void v9fs_kill_super(struct super_block *s)
	216	{
	217	struct v9fs_session_info *v9ses = s->s_fs_info;
	218
5d385153	219	p9_debug(P9_DEBUG_VFS, " %p\n", s);
9e82cf6a	220
9e82cf6a	221	kill_anon_super(s);
df5d8c80	222
6d96d3ab	223	v9fs_session_cancel(v9ses);
9e82cf6a EVH	224	v9fs_session_close(v9ses);
9e82cf6a EVH	225	kfree(v9ses);
1b5ab3e8	226	s->s_fs_info = NULL;
5d385153	227	p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
9e82cf6a EVH	228	}
9e82cf6a EVH	229
322b329a	230	static void
42faad99	231	v9fs_umount_begin(struct super_block *sb)
322b329a	232	{
67e55205	233	struct v9fs_session_info *v9ses;
322b329a	234
67e55205	235	v9ses = sb->s_fs_info;
6d96d3ab	236	v9fs_session_begin_cancel(v9ses);
322b329a EVH	237	}
322b329a EVH	238
bda8e775 SK	239	static int v9fs_statfs(struct dentry dentry, struct kstatfs buf)
	240	{
	241	struct v9fs_session_info *v9ses;
	242	struct p9_fid *fid;
	243	struct p9_rstatfs rs;
	244	int res;
	245
	246	fid = v9fs_fid_lookup(dentry);
	247	if (IS_ERR(fid)) {
	248	res = PTR_ERR(fid);
	249	goto done;
	250	}
	251
42869c8a	252	v9ses = v9fs_dentry2v9ses(dentry);
bda8e775 SK	253	if (v9fs_proto_dotl(v9ses)) {
	254	res = p9_client_statfs(fid, &rs);
	255	if (res == 0) {
5bdad933	256	buf->f_type = rs.type;
bda8e775 SK	257	buf->f_bsize = rs.bsize;
	258	buf->f_blocks = rs.blocks;
	259	buf->f_bfree = rs.bfree;
	260	buf->f_bavail = rs.bavail;
	261	buf->f_files = rs.files;
	262	buf->f_ffree = rs.ffree;
6d1349c7	263	buf->f_fsid = u64_to_fsid(rs.fsid);
bda8e775 SK	264	buf->f_namelen = rs.namelen;
	265	}
	266	if (res != -ENOSYS)
	267	goto done;
	268	}
	269	res = simple_statfs(dentry, buf);
	270	done:
6636b6dc	271	p9_client_clunk(fid);
bda8e775 SK	272	return res;
	273	}
	274
edd73cf5 AK	275	static int v9fs_drop_inode(struct inode *inode)
	276	{
	277	struct v9fs_session_info *v9ses;
	278	v9ses = v9fs_inode2v9ses(inode);
fb89b45c	279	if (v9ses->cache == CACHE_LOOSE \|\| v9ses->cache == CACHE_FSCACHE)
edd73cf5 AK	280	return generic_drop_inode(inode);
	281	/*
	282	* in case of non cached mode always drop the
	283	* the inode because we want the inode attribute
	284	* to always match that on the server.
	285	*/
	286	return 1;
	287	}
	288
c2ed3880 AK	289	static int v9fs_write_inode(struct inode *inode,
	290	struct writeback_control *wbc)
	291	{
	292	int ret;
	293	struct p9_wstat wstat;
	294	struct v9fs_inode *v9inode;
	295	/*
	296	* send an fsync request to server irrespective of
	297	* wbc->sync_mode.
	298	*/
5d385153	299	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
c2ed3880 AK	300	v9inode = V9FS_I(inode);
	301	if (!v9inode->writeback_fid)
	302	return 0;
	303	v9fs_blank_wstat(&wstat);
	304
	305	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
	306	if (ret < 0) {
	307	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	308	return ret;
	309	}
	310	return 0;
	311	}
	312
	313	static int v9fs_write_inode_dotl(struct inode *inode,
	314	struct writeback_control *wbc)
	315	{
	316	int ret;
	317	struct v9fs_inode *v9inode;
	318	/*
	319	* send an fsync request to server irrespective of
	320	* wbc->sync_mode.
	321	*/
c2ed3880	322	v9inode = V9FS_I(inode);
fb89b45c DM	323	p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
fb89b45c DM	324	__func__, inode, v9inode->writeback_fid);
c2ed3880 AK	325	if (!v9inode->writeback_fid)
c2ed3880 AK	326	return 0;
fb89b45c	327
c2ed3880 AK	328	ret = p9_client_fsync(v9inode->writeback_fid, 0);
	329	if (ret < 0) {
	330	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	331	return ret;
	332	}
	333	return 0;
	334	}
	335
ee9b6d61	336	static const struct super_operations v9fs_super_ops = {
60e78d2c	337	.alloc_inode = v9fs_alloc_inode,
5e8a0770	338	.free_inode = v9fs_free_inode,
9e82cf6a	339	.statfs = simple_statfs,
b57922d9	340	.evict_inode = v9fs_evict_inode,
c4fac910	341	.show_options = v9fs_show_options,
322b329a	342	.umount_begin = v9fs_umount_begin,
c2ed3880	343	.write_inode = v9fs_write_inode,
9e82cf6a EVH	344	};
9e82cf6a EVH	345
9b6533c9	346	static const struct super_operations v9fs_super_ops_dotl = {
9b6533c9	347	.alloc_inode = v9fs_alloc_inode,
5e8a0770	348	.free_inode = v9fs_free_inode,
bda8e775	349	.statfs = v9fs_statfs,
edd73cf5	350	.drop_inode = v9fs_drop_inode,
b57922d9	351	.evict_inode = v9fs_evict_inode,
c4fac910	352	.show_options = v9fs_show_options,
9b6533c9	353	.umount_begin = v9fs_umount_begin,
c2ed3880	354	.write_inode = v9fs_write_inode_dotl,
9b6533c9 SK	355	};
9b6533c9 SK	356
9e82cf6a	357	struct file_system_type v9fs_fs_type = {
67543e50	358	.name = "9p",
d2d1ea93	359	.mount = v9fs_mount,
9e82cf6a EVH	360	.kill_sb = v9fs_kill_super,
9e82cf6a EVH	361	.owner = THIS_MODULE,
ecf3d1f1	362	.fs_flags = FS_RENAME_DOES_D_MOVE,
9e82cf6a	363	};
7f78e035	364	MODULE_ALIAS_FS("9p");