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 |
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 | |
9249e17f | 92 | sb->s_flags |= MS_ACTIVE | MS_DIRSYNC | MS_NOATIME; |
db5841d4 AK |
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; | |
3eda0de6 | 120 | umode_t mode = S_IRWXUGO | S_ISVTX; |
bd238fb4 | 121 | struct p9_fid *fid; |
9e82cf6a EVH |
122 | int retval = 0; |
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); | |
412a19b6 | 133 | goto free_session; |
bd238fb4 LI |
134 | } |
135 | ||
9249e17f | 136 | sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses); |
454e2398 DH |
137 | if (IS_ERR(sb)) { |
138 | retval = PTR_ERR(sb); | |
f0853122 | 139 | goto clunk_fid; |
454e2398 | 140 | } |
4b53e4b5 | 141 | v9fs_fill_super(sb, v9ses, flags, data); |
9e82cf6a | 142 | |
fb89b45c | 143 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
98cd3fb0 AV |
144 | sb->s_d_op = &v9fs_cached_dentry_operations; |
145 | else | |
146 | sb->s_d_op = &v9fs_dentry_operations; | |
147 | ||
45089142 | 148 | inode = v9fs_get_inode(sb, S_IFDIR | mode, 0); |
9e82cf6a EVH |
149 | if (IS_ERR(inode)) { |
150 | retval = PTR_ERR(inode); | |
887b3ece | 151 | goto release_sb; |
9e82cf6a | 152 | } |
df5d8c80 | 153 | |
48fde701 | 154 | root = d_make_root(inode); |
9e82cf6a EVH |
155 | if (!root) { |
156 | retval = -ENOMEM; | |
887b3ece | 157 | goto release_sb; |
9e82cf6a | 158 | } |
9e82cf6a | 159 | sb->s_root = root; |
f0853122 SK |
160 | if (v9fs_proto_dotl(v9ses)) { |
161 | struct p9_stat_dotl *st = NULL; | |
162 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
163 | if (IS_ERR(st)) { | |
164 | retval = PTR_ERR(st); | |
5c25f347 | 165 | goto release_sb; |
f0853122 | 166 | } |
2b0143b5 DH |
167 | d_inode(root)->i_ino = v9fs_qid2ino(&st->qid); |
168 | v9fs_stat2inode_dotl(st, d_inode(root)); | |
f0853122 SK |
169 | kfree(st); |
170 | } else { | |
171 | struct p9_wstat *st = NULL; | |
172 | st = p9_client_stat(fid); | |
173 | if (IS_ERR(st)) { | |
174 | retval = PTR_ERR(st); | |
5c25f347 | 175 | goto release_sb; |
f0853122 SK |
176 | } |
177 | ||
2b0143b5 DH |
178 | d_inode(root)->i_ino = v9fs_qid2ino(&st->qid); |
179 | v9fs_stat2inode(st, d_inode(root), sb); | |
f0853122 SK |
180 | |
181 | p9stat_free(st); | |
182 | kfree(st); | |
183 | } | |
85ff872d AK |
184 | retval = v9fs_get_acl(inode, fid); |
185 | if (retval) | |
186 | goto release_sb; | |
df5d8c80 | 187 | v9fs_fid_add(root, fid); |
9e82cf6a | 188 | |
5d385153 | 189 | p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
d2d1ea93 | 190 | return dget(sb->s_root); |
9e82cf6a | 191 | |
887b3ece EVH |
192 | clunk_fid: |
193 | p9_client_clunk(fid); | |
887b3ece | 194 | v9fs_session_close(v9ses); |
412a19b6 | 195 | free_session: |
887b3ece | 196 | kfree(v9ses); |
d2d1ea93 | 197 | return ERR_PTR(retval); |
df5d8c80 | 198 | |
1b5ab3e8 | 199 | release_sb: |
5c25f347 | 200 | /* |
df5d8c80 AK |
201 | * we will do the session_close and root dentry release |
202 | * in the below call. But we need to clunk fid, because we haven't | |
203 | * attached the fid to dentry so it won't get clunked | |
204 | * automatically. | |
5c25f347 | 205 | */ |
df5d8c80 | 206 | p9_client_clunk(fid); |
1b5ab3e8 | 207 | deactivate_locked_super(sb); |
d2d1ea93 | 208 | return ERR_PTR(retval); |
9e82cf6a EVH |
209 | } |
210 | ||
211 | /** | |
212 | * v9fs_kill_super - Kill Superblock | |
213 | * @s: superblock | |
214 | * | |
215 | */ | |
216 | ||
217 | static void v9fs_kill_super(struct super_block *s) | |
218 | { | |
219 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
220 | ||
5d385153 | 221 | p9_debug(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 222 | |
9e82cf6a | 223 | kill_anon_super(s); |
df5d8c80 | 224 | |
6d96d3ab | 225 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
226 | v9fs_session_close(v9ses); |
227 | kfree(v9ses); | |
1b5ab3e8 | 228 | s->s_fs_info = NULL; |
5d385153 | 229 | p9_debug(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
230 | } |
231 | ||
322b329a | 232 | static void |
42faad99 | 233 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 234 | { |
67e55205 | 235 | struct v9fs_session_info *v9ses; |
322b329a | 236 | |
67e55205 | 237 | v9ses = sb->s_fs_info; |
6d96d3ab | 238 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
239 | } |
240 | ||
bda8e775 SK |
241 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
242 | { | |
243 | struct v9fs_session_info *v9ses; | |
244 | struct p9_fid *fid; | |
245 | struct p9_rstatfs rs; | |
246 | int res; | |
247 | ||
248 | fid = v9fs_fid_lookup(dentry); | |
249 | if (IS_ERR(fid)) { | |
250 | res = PTR_ERR(fid); | |
251 | goto done; | |
252 | } | |
253 | ||
42869c8a | 254 | v9ses = v9fs_dentry2v9ses(dentry); |
bda8e775 SK |
255 | if (v9fs_proto_dotl(v9ses)) { |
256 | res = p9_client_statfs(fid, &rs); | |
257 | if (res == 0) { | |
5bdad933 | 258 | buf->f_type = rs.type; |
bda8e775 SK |
259 | buf->f_bsize = rs.bsize; |
260 | buf->f_blocks = rs.blocks; | |
261 | buf->f_bfree = rs.bfree; | |
262 | buf->f_bavail = rs.bavail; | |
263 | buf->f_files = rs.files; | |
264 | buf->f_ffree = rs.ffree; | |
265 | buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL; | |
266 | buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL; | |
267 | buf->f_namelen = rs.namelen; | |
268 | } | |
269 | if (res != -ENOSYS) | |
270 | goto done; | |
271 | } | |
272 | res = simple_statfs(dentry, buf); | |
273 | done: | |
274 | return res; | |
275 | } | |
276 | ||
edd73cf5 AK |
277 | static int v9fs_drop_inode(struct inode *inode) |
278 | { | |
279 | struct v9fs_session_info *v9ses; | |
280 | v9ses = v9fs_inode2v9ses(inode); | |
fb89b45c | 281 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
edd73cf5 AK |
282 | return generic_drop_inode(inode); |
283 | /* | |
284 | * in case of non cached mode always drop the | |
285 | * the inode because we want the inode attribute | |
286 | * to always match that on the server. | |
287 | */ | |
288 | return 1; | |
289 | } | |
290 | ||
c2ed3880 AK |
291 | static int v9fs_write_inode(struct inode *inode, |
292 | struct writeback_control *wbc) | |
293 | { | |
294 | int ret; | |
295 | struct p9_wstat wstat; | |
296 | struct v9fs_inode *v9inode; | |
297 | /* | |
298 | * send an fsync request to server irrespective of | |
299 | * wbc->sync_mode. | |
300 | */ | |
5d385153 | 301 | p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode); |
c2ed3880 AK |
302 | v9inode = V9FS_I(inode); |
303 | if (!v9inode->writeback_fid) | |
304 | return 0; | |
305 | v9fs_blank_wstat(&wstat); | |
306 | ||
307 | ret = p9_client_wstat(v9inode->writeback_fid, &wstat); | |
308 | if (ret < 0) { | |
309 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
310 | return ret; | |
311 | } | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int v9fs_write_inode_dotl(struct inode *inode, | |
316 | struct writeback_control *wbc) | |
317 | { | |
318 | int ret; | |
319 | struct v9fs_inode *v9inode; | |
320 | /* | |
321 | * send an fsync request to server irrespective of | |
322 | * wbc->sync_mode. | |
323 | */ | |
c2ed3880 | 324 | v9inode = V9FS_I(inode); |
fb89b45c DM |
325 | p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n", |
326 | __func__, inode, v9inode->writeback_fid); | |
c2ed3880 AK |
327 | if (!v9inode->writeback_fid) |
328 | return 0; | |
fb89b45c | 329 | |
c2ed3880 AK |
330 | ret = p9_client_fsync(v9inode->writeback_fid, 0); |
331 | if (ret < 0) { | |
332 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
333 | return ret; | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
ee9b6d61 | 338 | static const struct super_operations v9fs_super_ops = { |
60e78d2c AK |
339 | .alloc_inode = v9fs_alloc_inode, |
340 | .destroy_inode = v9fs_destroy_inode, | |
9e82cf6a | 341 | .statfs = simple_statfs, |
b57922d9 | 342 | .evict_inode = v9fs_evict_inode, |
4b53e4b5 | 343 | .show_options = generic_show_options, |
322b329a | 344 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 345 | .write_inode = v9fs_write_inode, |
9e82cf6a EVH |
346 | }; |
347 | ||
9b6533c9 | 348 | static const struct super_operations v9fs_super_ops_dotl = { |
9b6533c9 SK |
349 | .alloc_inode = v9fs_alloc_inode, |
350 | .destroy_inode = v9fs_destroy_inode, | |
bda8e775 | 351 | .statfs = v9fs_statfs, |
edd73cf5 | 352 | .drop_inode = v9fs_drop_inode, |
b57922d9 | 353 | .evict_inode = v9fs_evict_inode, |
9b6533c9 SK |
354 | .show_options = generic_show_options, |
355 | .umount_begin = v9fs_umount_begin, | |
c2ed3880 | 356 | .write_inode = v9fs_write_inode_dotl, |
9b6533c9 SK |
357 | }; |
358 | ||
9e82cf6a | 359 | struct file_system_type v9fs_fs_type = { |
67543e50 | 360 | .name = "9p", |
d2d1ea93 | 361 | .mount = v9fs_mount, |
9e82cf6a EVH |
362 | .kill_sb = v9fs_kill_super, |
363 | .owner = THIS_MODULE, | |
ecf3d1f1 | 364 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 365 | }; |
7f78e035 | 366 | MODULE_ALIAS_FS("9p"); |