blob: 1d99b185bed1e1e670737464fcb59b0060728f93 [file] [log] [blame]
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -07001/*
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
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080011 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070013 *
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>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070028#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>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070034#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>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040039#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Sripathi Kodibda8e772010-03-25 12:45:30 +000041#include <linux/statfs.h>
M. Mohan Kumar368c09d2010-09-27 14:17:24 +053042#include <linux/magic.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050043#include <net/9p/9p.h>
44#include <net/9p/client.h>
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070045
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070046#include "v9fs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070047#include "v9fs_vfs.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070048#include "fid.h"
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053049#include "xattr.h"
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053050#include "acl.h"
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070051
Sripathi Kodi9b6533c2010-03-25 12:41:54 +000052static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070053
54/**
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070055 * v9fs_set_super - set the superblock
56 * @s: super block
57 * @data: file system specific data
58 *
59 */
60
61static 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
Al Virod2d1ea92010-07-25 23:56:43 +040071 * @flags: flags propagated from v9fs_mount()
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070072 *
73 */
74
75static void
76v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -050077 int flags, void *data)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070078{
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;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053083 if (v9fs_proto_dotl(v9ses)) {
Sripathi Kodi9b6533c2010-03-25 12:41:54 +000084 sb->s_op = &v9fs_super_ops_dotl;
Aneesh Kumar K.Vebf46262010-05-31 13:22:56 +053085 sb->s_xattr = v9fs_xattr_handlers;
86 } else
Sripathi Kodi9b6533c2010-03-25 12:41:54 +000087 sb->s_op = &v9fs_super_ops;
Jens Axboe0ed07dd2010-04-22 11:42:00 +020088 sb->s_bdi = &v9ses->bdi;
Aneesh Kumar K.V6b365602011-02-28 17:04:03 +053089 if (v9ses->cache)
90 sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -070091
Aneesh Kumar K.Vdb5841d2011-02-28 17:03:59 +053092 sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
93 if (!v9ses->cache)
94 sb->s_flags |= MS_SYNCHRONOUS;
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -050095
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053096#ifdef CONFIG_9P_FS_POSIX_ACL
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080097 if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +053098 sb->s_flags |= MS_POSIXACL;
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053099#endif
100
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500101 save_mount_options(sb, data);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700102}
103
104/**
Al Virod2d1ea92010-07-25 23:56:43 +0400105 * v9fs_mount - mount a superblock
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700106 * @fs_type: file system type
107 * @flags: mount flags
108 * @dev_name: device name that was mounted
109 * @data: mount options
110 *
111 */
112
Al Virod2d1ea92010-07-25 23:56:43 +0400113static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
114 const char *dev_name, void *data)
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700115{
116 struct super_block *sb = NULL;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700117 struct inode *inode = NULL;
118 struct dentry *root = NULL;
119 struct v9fs_session_info *v9ses = NULL;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700120 int mode = S_IRWXUGO | S_ISVTX;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500121 struct p9_fid *fid;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700122 int retval = 0;
123
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500124 P9_DPRINTK(P9_DEBUG_VFS, " \n");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700125
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800126 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700127 if (!v9ses)
Al Virod2d1ea92010-07-25 23:56:43 +0400128 return ERR_PTR(-ENOMEM);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700129
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500130 fid = v9fs_session_init(v9ses, dev_name, data);
131 if (IS_ERR(fid)) {
132 retval = PTR_ERR(fid);
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000133 /*
134 * we need to call session_close to tear down some
135 * of the data structure setup by session_init
136 */
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500137 goto close_session;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500138 }
139
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700140 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
David Howells454e2392006-06-23 02:02:57 -0700141 if (IS_ERR(sb)) {
142 retval = PTR_ERR(sb);
Sripathi Kodif0853122010-07-12 20:07:23 +0530143 goto clunk_fid;
David Howells454e2392006-06-23 02:02:57 -0700144 }
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500145 v9fs_fill_super(sb, v9ses, flags, data);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700146
Al Viro98cd3fb2011-01-12 17:10:55 -0500147 if (v9ses->cache)
148 sb->s_d_op = &v9fs_cached_dentry_operations;
149 else
150 sb->s_d_op = &v9fs_dentry_operations;
151
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700152 inode = v9fs_get_inode(sb, S_IFDIR | mode);
153 if (IS_ERR(inode)) {
154 retval = PTR_ERR(inode);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500155 goto release_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700156 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700157 root = d_alloc_root(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700158 if (!root) {
Al Viroc96f5852009-05-06 01:35:04 -0400159 iput(inode);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700160 retval = -ENOMEM;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500161 goto release_sb;
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700162 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700163 sb->s_root = root;
Sripathi Kodif0853122010-07-12 20:07:23 +0530164 if (v9fs_proto_dotl(v9ses)) {
165 struct p9_stat_dotl *st = NULL;
166 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
167 if (IS_ERR(st)) {
168 retval = PTR_ERR(st);
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000169 goto release_sb;
Sripathi Kodif0853122010-07-12 20:07:23 +0530170 }
Aneesh Kumar K.V0e432702011-02-28 17:04:06 +0530171 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
Sripathi Kodif0853122010-07-12 20:07:23 +0530172 v9fs_stat2inode_dotl(st, root->d_inode);
173 kfree(st);
174 } else {
175 struct p9_wstat *st = NULL;
176 st = p9_client_stat(fid);
177 if (IS_ERR(st)) {
178 retval = PTR_ERR(st);
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000179 goto release_sb;
Sripathi Kodif0853122010-07-12 20:07:23 +0530180 }
181
182 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
183 v9fs_stat2inode(st, root->d_inode, sb);
184
185 p9stat_free(st);
186 kfree(st);
187 }
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530188 v9fs_fid_add(root, fid);
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +0530189 retval = v9fs_get_acl(inode, fid);
190 if (retval)
191 goto release_sb;
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530192 /*
193 * Add the root fid to session info. This is used
194 * for file system sync. We want a cloned fid here
195 * so that we can do a sync_filesystem after a
196 * shrink_dcache_for_umount
197 */
198 v9ses->root_fid = v9fs_fid_clone(root);
199 if (IS_ERR(v9ses->root_fid)) {
200 retval = PTR_ERR(v9ses->root_fid);
201 goto release_sb;
202 }
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700203
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000204 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
Al Virod2d1ea92010-07-25 23:56:43 +0400205 return dget(sb->s_root);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700206
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500207clunk_fid:
208 p9_client_clunk(fid);
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500209close_session:
210 v9fs_session_close(v9ses);
211 kfree(v9ses);
Al Virod2d1ea92010-07-25 23:56:43 +0400212 return ERR_PTR(retval);
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600213release_sb:
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000214 /*
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530215 * we will do the session_close and root dentry
216 * release in the below call.
Aneesh Kumar K.V5c25f342010-08-24 10:30:49 +0000217 */
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600218 deactivate_locked_super(sb);
Al Virod2d1ea92010-07-25 23:56:43 +0400219 return ERR_PTR(retval);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700220}
221
222/**
223 * v9fs_kill_super - Kill Superblock
224 * @s: superblock
225 *
226 */
227
228static void v9fs_kill_super(struct super_block *s)
229{
230 struct v9fs_session_info *v9ses = s->s_fs_info;
231
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500232 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700233
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700234 kill_anon_super(s);
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530235 p9_client_clunk(v9ses->root_fid);
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500236 v9fs_session_cancel(v9ses);
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700237 v9fs_session_close(v9ses);
238 kfree(v9ses);
Abhishek Kulkarni1b5ab3e2009-07-19 13:41:52 -0600239 s->s_fs_info = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500240 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700241}
242
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700243static void
Al Viro42faad92008-04-24 07:21:56 -0400244v9fs_umount_begin(struct super_block *sb)
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700245{
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200246 struct v9fs_session_info *v9ses;
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700247
Alessio Igor Bogani67e55202009-04-24 09:06:53 +0200248 v9ses = sb->s_fs_info;
Aneesh Kumar K.V6d96d3a2010-03-29 18:13:59 -0500249 v9fs_session_begin_cancel(v9ses);
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700250}
251
Sripathi Kodibda8e772010-03-25 12:45:30 +0000252static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
253{
254 struct v9fs_session_info *v9ses;
255 struct p9_fid *fid;
256 struct p9_rstatfs rs;
257 int res;
258
259 fid = v9fs_fid_lookup(dentry);
260 if (IS_ERR(fid)) {
261 res = PTR_ERR(fid);
262 goto done;
263 }
264
265 v9ses = v9fs_inode2v9ses(dentry->d_inode);
266 if (v9fs_proto_dotl(v9ses)) {
267 res = p9_client_statfs(fid, &rs);
268 if (res == 0) {
M. Mohan Kumar368c09d2010-09-27 14:17:24 +0530269 buf->f_type = V9FS_MAGIC;
Sripathi Kodibda8e772010-03-25 12:45:30 +0000270 buf->f_bsize = rs.bsize;
271 buf->f_blocks = rs.blocks;
272 buf->f_bfree = rs.bfree;
273 buf->f_bavail = rs.bavail;
274 buf->f_files = rs.files;
275 buf->f_ffree = rs.ffree;
276 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
277 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
278 buf->f_namelen = rs.namelen;
279 }
280 if (res != -ENOSYS)
281 goto done;
282 }
283 res = simple_statfs(dentry, buf);
284done:
285 return res;
286}
287
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530288static int v9fs_sync_fs(struct super_block *sb, int wait)
289{
290 struct v9fs_session_info *v9ses = sb->s_fs_info;
291
292 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_sync_fs: super_block %p\n", sb);
293 return p9_client_sync_fs(v9ses->root_fid);
294}
295
Aneesh Kumar K.Vedd73cf2011-02-28 17:04:05 +0530296static int v9fs_drop_inode(struct inode *inode)
297{
298 struct v9fs_session_info *v9ses;
299 v9ses = v9fs_inode2v9ses(inode);
300 if (v9ses->cache)
301 return generic_drop_inode(inode);
302 /*
303 * in case of non cached mode always drop the
304 * the inode because we want the inode attribute
305 * to always match that on the server.
306 */
307 return 1;
308}
309
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800310static const struct super_operations v9fs_super_ops = {
Abhishek Kulkarni60e78d22009-09-23 13:00:27 -0500311 .alloc_inode = v9fs_alloc_inode,
312 .destroy_inode = v9fs_destroy_inode,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700313 .statfs = simple_statfs,
Al Virob57922d2010-06-07 14:34:48 -0400314 .evict_inode = v9fs_evict_inode,
Abhishek Kulkarni4b53e4b2009-08-17 16:42:28 -0500315 .show_options = generic_show_options,
Eric Van Hensbergen322b3292005-09-09 13:04:23 -0700316 .umount_begin = v9fs_umount_begin,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700317};
318
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000319static const struct super_operations v9fs_super_ops_dotl = {
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000320 .alloc_inode = v9fs_alloc_inode,
321 .destroy_inode = v9fs_destroy_inode,
Aneesh Kumar K.V00ea2df2011-02-28 17:04:00 +0530322 .sync_fs = v9fs_sync_fs,
Sripathi Kodibda8e772010-03-25 12:45:30 +0000323 .statfs = v9fs_statfs,
Aneesh Kumar K.Vedd73cf2011-02-28 17:04:05 +0530324 .drop_inode = v9fs_drop_inode,
Al Virob57922d2010-06-07 14:34:48 -0400325 .evict_inode = v9fs_evict_inode,
Sripathi Kodi9b6533c2010-03-25 12:41:54 +0000326 .show_options = generic_show_options,
327 .umount_begin = v9fs_umount_begin,
328};
329
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700330struct file_system_type v9fs_fs_type = {
Eric Van Hensbergen67543e52006-03-25 03:07:29 -0800331 .name = "9p",
Al Virod2d1ea92010-07-25 23:56:43 +0400332 .mount = v9fs_mount,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700333 .kill_sb = v9fs_kill_super,
334 .owner = THIS_MODULE,
Aneesh Kumar K.Va534c8d2010-06-30 19:18:50 +0530335 .fs_flags = FS_RENAME_DOES_D_MOVE,
Eric Van Hensbergen9e82cf62005-09-09 13:04:20 -0700336};