[mirror_ubuntu-bionic-kernel.git] / fs / 9p / vfs_super.c

/*
 *  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>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#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/seq_file.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 void
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
		int flags, void *data)
{
	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_bdi = &v9ses->bdi;
	if (v9ses->cache)
		sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;

	sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
	if (!v9ses->cache)
		sb->s_flags |= MS_SYNCHRONOUS;

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

	save_mount_options(sb, data);
}

/**
 * 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);
		/*
		 * we need to call session_close to tear down some
		 * of the data structure setup by session_init
		 */
		goto close_session;
	}

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

	if (v9ses->cache)
		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_alloc_root(inode);
	if (!root) {
		iput(inode);
		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;
		}
		root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
		v9fs_stat2inode_dotl(st, root->d_inode);
		kfree(st);
	} else {
		struct p9_wstat *st = NULL;
		st = p9_client_stat(fid);
		if (IS_ERR(st)) {
			retval = PTR_ERR(st);
			goto release_sb;
		}

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

		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);
close_session:
	v9fs_session_close(v9ses);
	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 = V9FS_MAGIC;
			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.val[0] = rs.fsid & 0xFFFFFFFFUL;
			buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
			buf->f_namelen = rs.namelen;
		}
		if (res != -ENOSYS)
			goto done;
	}
	res = simple_statfs(dentry, buf);
done:
	return res;
}

static int v9fs_drop_inode(struct inode *inode)
{
	struct v9fs_session_info *v9ses;
	v9ses = v9fs_inode2v9ses(inode);
	if (v9ses->cache)
		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.
	 */
	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
	v9inode = V9FS_I(inode);
	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,
	.destroy_inode = v9fs_destroy_inode,
	.statfs = simple_statfs,
	.evict_inode = v9fs_evict_inode,
	.show_options = generic_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,
	.destroy_inode = v9fs_destroy_inode,
	.statfs = v9fs_statfs,
	.drop_inode = v9fs_drop_inode,
	.evict_inode = v9fs_evict_inode,
	.show_options = generic_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|FS_REVAL_DOT,
};
Commit	Line	Data
9e82cf6a EVH	1	/*
	2	* linux/fs/9p/vfs_super.c
	3	*
	4	* This file contians superblock ops for 9P2000. It is intended that
	5	* you mount this file system on directories.
	6	*
	7	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	8	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
42e8c509 EVH	11	* it under the terms of the GNU General Public License version 2
42e8c509 EVH	12	* as published by the Free Software Foundation.
9e82cf6a EVH	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to:
	21	* Free Software Foundation
	22	* 51 Franklin Street, Fifth Floor
	23	* Boston, MA 02111-1301 USA
	24	*
	25	*/
	26
	27	#include <linux/kernel.h>
9e82cf6a EVH	28	#include <linux/module.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
	31	#include <linux/file.h>
	32	#include <linux/stat.h>
	33	#include <linux/string.h>
9e82cf6a EVH	34	#include <linux/inet.h>
	35	#include <linux/pagemap.h>
	36	#include <linux/seq_file.h>
	37	#include <linux/mount.h>
	38	#include <linux/idr.h>
e8edc6e0	39	#include <linux/sched.h>
5a0e3ad6	40	#include <linux/slab.h>
bda8e775	41	#include <linux/statfs.h>
368c09d2	42	#include <linux/magic.h>
bd238fb4 LI	43	#include <net/9p/9p.h>
bd238fb4 LI	44	#include <net/9p/client.h>
9e82cf6a	45
9e82cf6a	46	#include "v9fs.h"
9e82cf6a	47	#include "v9fs_vfs.h"
9e82cf6a	48	#include "fid.h"
ebf46264	49	#include "xattr.h"
85ff872d	50	#include "acl.h"
9e82cf6a	51
9b6533c9	52	static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
9e82cf6a	53
9e82cf6a EVH	54	/**
	55	* v9fs_set_super - set the superblock
	56	* @s: super block
	57	* @data: file system specific data
	58	*
	59	*/
	60
	61	static int v9fs_set_super(struct super_block s, void data)
	62	{
	63	s->s_fs_info = data;
	64	return set_anon_super(s, data);
	65	}
	66
	67	/**
	68	* v9fs_fill_super - populate superblock with info
	69	* @sb: superblock
	70	* @v9ses: session information
d2d1ea93	71	* @flags: flags propagated from v9fs_mount()
9e82cf6a EVH	72	*
	73	*/
	74
	75	static void
	76	v9fs_fill_super(struct super_block sb, struct v9fs_session_info v9ses,
4b53e4b5	77	int flags, void *data)
9e82cf6a EVH	78	{
	79	sb->s_maxbytes = MAX_LFS_FILESIZE;
	80	sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
	81	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	82	sb->s_magic = V9FS_MAGIC;
ebf46264	83	if (v9fs_proto_dotl(v9ses)) {
9b6533c9	84	sb->s_op = &v9fs_super_ops_dotl;
ebf46264 AK	85	sb->s_xattr = v9fs_xattr_handlers;
ebf46264 AK	86	} else
9b6533c9	87	sb->s_op = &v9fs_super_ops;
0ed07ddb	88	sb->s_bdi = &v9ses->bdi;
6b365604 AK	89	if (v9ses->cache)
6b365604 AK	90	sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
9e82cf6a	91
db5841d4 AK	92	sb->s_flags = flags \| MS_ACTIVE \| MS_DIRSYNC \| MS_NOATIME;
	93	if (!v9ses->cache)
	94	sb->s_flags \|= MS_SYNCHRONOUS;
4b53e4b5	95
85ff872d	96	#ifdef CONFIG_9P_FS_POSIX_ACL
e782ef71	97	if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
76381a42	98	sb->s_flags \|= MS_POSIXACL;
85ff872d AK	99	#endif
85ff872d AK	100
4b53e4b5	101	save_mount_options(sb, data);
9e82cf6a EVH	102	}
	103
	104	/**
d2d1ea93	105	* v9fs_mount - mount a superblock
9e82cf6a EVH	106	* @fs_type: file system type
	107	* @flags: mount flags
	108	* @dev_name: device name that was mounted
	109	* @data: mount options
	110	*
	111	*/
	112
d2d1ea93 AV	113	static struct dentry v9fs_mount(struct file_system_type fs_type, int flags,
d2d1ea93 AV	114	const char dev_name, void data)
9e82cf6a EVH	115	{
9e82cf6a EVH	116	struct super_block *sb = NULL;
9e82cf6a EVH	117	struct inode *inode = NULL;
	118	struct dentry *root = NULL;
	119	struct v9fs_session_info *v9ses = NULL;
3eda0de6	120	umode_t mode = S_IRWXUGO \| S_ISVTX;
bd238fb4	121	struct p9_fid *fid;
9e82cf6a EVH	122	int retval = 0;
9e82cf6a EVH	123
5d385153	124	p9_debug(P9_DEBUG_VFS, "\n");
9e82cf6a	125
1dac06b2	126	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
9e82cf6a	127	if (!v9ses)
d2d1ea93	128	return ERR_PTR(-ENOMEM);
9e82cf6a	129
bd238fb4 LI	130	fid = v9fs_session_init(v9ses, dev_name, data);
	131	if (IS_ERR(fid)) {
	132	retval = PTR_ERR(fid);
5c25f347 AK	133	/*
	134	* we need to call session_close to tear down some
	135	* of the data structure setup by session_init
	136	*/
887b3ece	137	goto close_session;
bd238fb4 LI	138	}
bd238fb4 LI	139
9e82cf6a	140	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
454e2398 DH	141	if (IS_ERR(sb)) {
454e2398 DH	142	retval = PTR_ERR(sb);
f0853122	143	goto clunk_fid;
454e2398	144	}
4b53e4b5	145	v9fs_fill_super(sb, v9ses, flags, data);
9e82cf6a	146
98cd3fb0 AV	147	if (v9ses->cache)
	148	sb->s_d_op = &v9fs_cached_dentry_operations;
	149	else
	150	sb->s_d_op = &v9fs_dentry_operations;
	151
45089142	152	inode = v9fs_get_inode(sb, S_IFDIR \| mode, 0);
9e82cf6a EVH	153	if (IS_ERR(inode)) {
9e82cf6a EVH	154	retval = PTR_ERR(inode);
887b3ece	155	goto release_sb;
9e82cf6a	156	}
df5d8c80	157
9e82cf6a	158	root = d_alloc_root(inode);
9e82cf6a	159	if (!root) {
c96f5857	160	iput(inode);
9e82cf6a	161	retval = -ENOMEM;
887b3ece	162	goto release_sb;
9e82cf6a	163	}
9e82cf6a	164	sb->s_root = root;
f0853122 SK	165	if (v9fs_proto_dotl(v9ses)) {
	166	struct p9_stat_dotl *st = NULL;
	167	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
	168	if (IS_ERR(st)) {
	169	retval = PTR_ERR(st);
5c25f347	170	goto release_sb;
f0853122	171	}
0e432703	172	root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
f0853122 SK	173	v9fs_stat2inode_dotl(st, root->d_inode);
	174	kfree(st);
	175	} else {
	176	struct p9_wstat *st = NULL;
	177	st = p9_client_stat(fid);
	178	if (IS_ERR(st)) {
	179	retval = PTR_ERR(st);
5c25f347	180	goto release_sb;
f0853122 SK	181	}
	182
	183	root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
	184	v9fs_stat2inode(st, root->d_inode, sb);
	185
	186	p9stat_free(st);
	187	kfree(st);
	188	}
85ff872d AK	189	retval = v9fs_get_acl(inode, fid);
	190	if (retval)
	191	goto release_sb;
df5d8c80	192	v9fs_fid_add(root, fid);
9e82cf6a	193
5d385153	194	p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
d2d1ea93	195	return dget(sb->s_root);
9e82cf6a	196
887b3ece EVH	197	clunk_fid:
887b3ece EVH	198	p9_client_clunk(fid);
887b3ece EVH	199	close_session:
	200	v9fs_session_close(v9ses);
	201	kfree(v9ses);
d2d1ea93	202	return ERR_PTR(retval);
df5d8c80	203
1b5ab3e8	204	release_sb:
5c25f347	205	/*
df5d8c80 AK	206	* we will do the session_close and root dentry release
	207	* in the below call. But we need to clunk fid, because we haven't
	208	* attached the fid to dentry so it won't get clunked
	209	* automatically.
5c25f347	210	*/
df5d8c80	211	p9_client_clunk(fid);
1b5ab3e8	212	deactivate_locked_super(sb);
d2d1ea93	213	return ERR_PTR(retval);
9e82cf6a EVH	214	}
	215
	216	/**
	217	* v9fs_kill_super - Kill Superblock
	218	* @s: superblock
	219	*
	220	*/
	221
	222	static void v9fs_kill_super(struct super_block *s)
	223	{
	224	struct v9fs_session_info *v9ses = s->s_fs_info;
	225
5d385153	226	p9_debug(P9_DEBUG_VFS, " %p\n", s);
9e82cf6a	227
9e82cf6a	228	kill_anon_super(s);
df5d8c80	229
6d96d3ab	230	v9fs_session_cancel(v9ses);
9e82cf6a EVH	231	v9fs_session_close(v9ses);
9e82cf6a EVH	232	kfree(v9ses);
1b5ab3e8	233	s->s_fs_info = NULL;
5d385153	234	p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
9e82cf6a EVH	235	}
9e82cf6a EVH	236
322b329a	237	static void
42faad99	238	v9fs_umount_begin(struct super_block *sb)
322b329a	239	{
67e55205	240	struct v9fs_session_info *v9ses;
322b329a	241
67e55205	242	v9ses = sb->s_fs_info;
6d96d3ab	243	v9fs_session_begin_cancel(v9ses);
322b329a EVH	244	}
322b329a EVH	245
bda8e775 SK	246	static int v9fs_statfs(struct dentry dentry, struct kstatfs buf)
	247	{
	248	struct v9fs_session_info *v9ses;
	249	struct p9_fid *fid;
	250	struct p9_rstatfs rs;
	251	int res;
	252
	253	fid = v9fs_fid_lookup(dentry);
	254	if (IS_ERR(fid)) {
	255	res = PTR_ERR(fid);
	256	goto done;
	257	}
	258
42869c8a	259	v9ses = v9fs_dentry2v9ses(dentry);
bda8e775 SK	260	if (v9fs_proto_dotl(v9ses)) {
	261	res = p9_client_statfs(fid, &rs);
	262	if (res == 0) {
368c09d2	263	buf->f_type = V9FS_MAGIC;
bda8e775 SK	264	buf->f_bsize = rs.bsize;
	265	buf->f_blocks = rs.blocks;
	266	buf->f_bfree = rs.bfree;
	267	buf->f_bavail = rs.bavail;
	268	buf->f_files = rs.files;
	269	buf->f_ffree = rs.ffree;
	270	buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
	271	buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
	272	buf->f_namelen = rs.namelen;
	273	}
	274	if (res != -ENOSYS)
	275	goto done;
	276	}
	277	res = simple_statfs(dentry, buf);
	278	done:
	279	return res;
	280	}
	281
edd73cf5 AK	282	static int v9fs_drop_inode(struct inode *inode)
	283	{
	284	struct v9fs_session_info *v9ses;
	285	v9ses = v9fs_inode2v9ses(inode);
	286	if (v9ses->cache)
	287	return generic_drop_inode(inode);
	288	/*
	289	* in case of non cached mode always drop the
	290	* the inode because we want the inode attribute
	291	* to always match that on the server.
	292	*/
	293	return 1;
	294	}
	295
c2ed3880 AK	296	static int v9fs_write_inode(struct inode *inode,
	297	struct writeback_control *wbc)
	298	{
	299	int ret;
	300	struct p9_wstat wstat;
	301	struct v9fs_inode *v9inode;
	302	/*
	303	* send an fsync request to server irrespective of
	304	* wbc->sync_mode.
	305	*/
5d385153	306	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
c2ed3880 AK	307	v9inode = V9FS_I(inode);
	308	if (!v9inode->writeback_fid)
	309	return 0;
	310	v9fs_blank_wstat(&wstat);
	311
	312	ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
	313	if (ret < 0) {
	314	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	315	return ret;
	316	}
	317	return 0;
	318	}
	319
	320	static int v9fs_write_inode_dotl(struct inode *inode,
	321	struct writeback_control *wbc)
	322	{
	323	int ret;
	324	struct v9fs_inode *v9inode;
	325	/*
	326	* send an fsync request to server irrespective of
	327	* wbc->sync_mode.
	328	*/
5d385153	329	p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
c2ed3880 AK	330	v9inode = V9FS_I(inode);
	331	if (!v9inode->writeback_fid)
	332	return 0;
	333	ret = p9_client_fsync(v9inode->writeback_fid, 0);
	334	if (ret < 0) {
	335	__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
	336	return ret;
	337	}
	338	return 0;
	339	}
	340
ee9b6d61	341	static const struct super_operations v9fs_super_ops = {
60e78d2c AK	342	.alloc_inode = v9fs_alloc_inode,
60e78d2c AK	343	.destroy_inode = v9fs_destroy_inode,
9e82cf6a	344	.statfs = simple_statfs,
b57922d9	345	.evict_inode = v9fs_evict_inode,
4b53e4b5	346	.show_options = generic_show_options,
322b329a	347	.umount_begin = v9fs_umount_begin,
c2ed3880	348	.write_inode = v9fs_write_inode,
9e82cf6a EVH	349	};
9e82cf6a EVH	350
9b6533c9	351	static const struct super_operations v9fs_super_ops_dotl = {
9b6533c9 SK	352	.alloc_inode = v9fs_alloc_inode,
9b6533c9 SK	353	.destroy_inode = v9fs_destroy_inode,
bda8e775	354	.statfs = v9fs_statfs,
edd73cf5	355	.drop_inode = v9fs_drop_inode,
b57922d9	356	.evict_inode = v9fs_evict_inode,
9b6533c9 SK	357	.show_options = generic_show_options,
9b6533c9 SK	358	.umount_begin = v9fs_umount_begin,
c2ed3880	359	.write_inode = v9fs_write_inode_dotl,
9b6533c9 SK	360	};
9b6533c9 SK	361
9e82cf6a	362	struct file_system_type v9fs_fs_type = {
67543e50	363	.name = "9p",
d2d1ea93	364	.mount = v9fs_mount,
9e82cf6a EVH	365	.kill_sb = v9fs_kill_super,
9e82cf6a EVH	366	.owner = THIS_MODULE,
823fcfd4	367	.fs_flags = FS_RENAME_DOES_D_MOVE\|FS_REVAL_DOT,
9e82cf6a	368	};