Commit | Line | Data |
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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 |
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> |
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; |
86 | } else | |
9b6533c9 | 87 | sb->s_op = &v9fs_super_ops; |
0ed07ddb | 88 | sb->s_bdi = &v9ses->bdi; |
6b365604 AK |
89 | if (v9ses->cache) |
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 |
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, |
114 | const char *dev_name, void *data) | |
9e82cf6a EVH |
115 | { |
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; | |
9e82cf6a | 120 | int mode = S_IRWXUGO | S_ISVTX; |
bd238fb4 | 121 | struct p9_fid *fid; |
9e82cf6a EVH |
122 | int retval = 0; |
123 | ||
bd238fb4 | 124 | P9_DPRINTK(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 | } |
139 | ||
9e82cf6a | 140 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
454e2398 DH |
141 | if (IS_ERR(sb)) { |
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 | ||
9e82cf6a EVH |
152 | inode = v9fs_get_inode(sb, S_IFDIR | mode); |
153 | if (IS_ERR(inode)) { | |
154 | retval = PTR_ERR(inode); | |
887b3ece | 155 | goto release_sb; |
9e82cf6a | 156 | } |
9e82cf6a | 157 | root = d_alloc_root(inode); |
9e82cf6a | 158 | if (!root) { |
c96f5857 | 159 | iput(inode); |
9e82cf6a | 160 | retval = -ENOMEM; |
887b3ece | 161 | goto release_sb; |
9e82cf6a | 162 | } |
9e82cf6a | 163 | sb->s_root = root; |
f0853122 SK |
164 | 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); | |
5c25f347 | 169 | goto release_sb; |
f0853122 | 170 | } |
0e432703 | 171 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); |
f0853122 SK |
172 | 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); | |
5c25f347 | 179 | goto release_sb; |
f0853122 SK |
180 | } |
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 | } | |
00ea2df4 | 188 | v9fs_fid_add(root, fid); |
85ff872d AK |
189 | retval = v9fs_get_acl(inode, fid); |
190 | if (retval) | |
191 | goto release_sb; | |
00ea2df4 AK |
192 | /* |
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 | } | |
9e82cf6a | 203 | |
5c25f347 | 204 | P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
d2d1ea93 | 205 | return dget(sb->s_root); |
9e82cf6a | 206 | |
887b3ece EVH |
207 | clunk_fid: |
208 | p9_client_clunk(fid); | |
887b3ece EVH |
209 | close_session: |
210 | v9fs_session_close(v9ses); | |
211 | kfree(v9ses); | |
d2d1ea93 | 212 | return ERR_PTR(retval); |
1b5ab3e8 | 213 | release_sb: |
5c25f347 | 214 | /* |
00ea2df4 AK |
215 | * we will do the session_close and root dentry |
216 | * release in the below call. | |
5c25f347 | 217 | */ |
1b5ab3e8 | 218 | deactivate_locked_super(sb); |
d2d1ea93 | 219 | return ERR_PTR(retval); |
9e82cf6a EVH |
220 | } |
221 | ||
222 | /** | |
223 | * v9fs_kill_super - Kill Superblock | |
224 | * @s: superblock | |
225 | * | |
226 | */ | |
227 | ||
228 | static void v9fs_kill_super(struct super_block *s) | |
229 | { | |
230 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
231 | ||
bd238fb4 | 232 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 233 | |
9e82cf6a | 234 | kill_anon_super(s); |
00ea2df4 | 235 | p9_client_clunk(v9ses->root_fid); |
6d96d3ab | 236 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
237 | v9fs_session_close(v9ses); |
238 | kfree(v9ses); | |
1b5ab3e8 | 239 | s->s_fs_info = NULL; |
bd238fb4 | 240 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
241 | } |
242 | ||
322b329a | 243 | static void |
42faad99 | 244 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 245 | { |
67e55205 | 246 | struct v9fs_session_info *v9ses; |
322b329a | 247 | |
67e55205 | 248 | v9ses = sb->s_fs_info; |
6d96d3ab | 249 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
250 | } |
251 | ||
bda8e775 SK |
252 | static 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) { | |
368c09d2 | 269 | buf->f_type = V9FS_MAGIC; |
bda8e775 SK |
270 | 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); | |
284 | done: | |
285 | return res; | |
286 | } | |
287 | ||
00ea2df4 AK |
288 | static 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 | ||
edd73cf5 AK |
296 | static 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 | ||
ee9b6d61 | 310 | static const struct super_operations v9fs_super_ops = { |
60e78d2c AK |
311 | .alloc_inode = v9fs_alloc_inode, |
312 | .destroy_inode = v9fs_destroy_inode, | |
9e82cf6a | 313 | .statfs = simple_statfs, |
b57922d9 | 314 | .evict_inode = v9fs_evict_inode, |
4b53e4b5 | 315 | .show_options = generic_show_options, |
322b329a | 316 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
317 | }; |
318 | ||
9b6533c9 | 319 | static const struct super_operations v9fs_super_ops_dotl = { |
9b6533c9 SK |
320 | .alloc_inode = v9fs_alloc_inode, |
321 | .destroy_inode = v9fs_destroy_inode, | |
00ea2df4 | 322 | .sync_fs = v9fs_sync_fs, |
bda8e775 | 323 | .statfs = v9fs_statfs, |
edd73cf5 | 324 | .drop_inode = v9fs_drop_inode, |
b57922d9 | 325 | .evict_inode = v9fs_evict_inode, |
9b6533c9 SK |
326 | .show_options = generic_show_options, |
327 | .umount_begin = v9fs_umount_begin, | |
328 | }; | |
329 | ||
9e82cf6a | 330 | struct file_system_type v9fs_fs_type = { |
67543e50 | 331 | .name = "9p", |
d2d1ea93 | 332 | .mount = v9fs_mount, |
9e82cf6a EVH |
333 | .kill_sb = v9fs_kill_super, |
334 | .owner = THIS_MODULE, | |
823fcfd4 | 335 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT, |
9e82cf6a | 336 | }; |