Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9e82cf6a | 2 | /* |
9e82cf6a EVH |
3 | * |
4 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
5 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
9e82cf6a EVH |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9e82cf6a EVH |
9 | #include <linux/module.h> |
10 | #include <linux/errno.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/string.h> | |
9e82cf6a EVH |
15 | #include <linux/inet.h> |
16 | #include <linux/pagemap.h> | |
9e82cf6a | 17 | #include <linux/mount.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
bda8e775 | 20 | #include <linux/statfs.h> |
368c09d2 | 21 | #include <linux/magic.h> |
93c84614 | 22 | #include <linux/fscache.h> |
bd238fb4 LI |
23 | #include <net/9p/9p.h> |
24 | #include <net/9p/client.h> | |
9e82cf6a | 25 | |
9e82cf6a | 26 | #include "v9fs.h" |
9e82cf6a | 27 | #include "v9fs_vfs.h" |
9e82cf6a | 28 | #include "fid.h" |
ebf46264 | 29 | #include "xattr.h" |
85ff872d | 30 | #include "acl.h" |
9e82cf6a | 31 | |
9b6533c9 | 32 | static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
9e82cf6a | 33 | |
9e82cf6a EVH |
34 | /** |
35 | * v9fs_set_super - set the superblock | |
36 | * @s: super block | |
37 | * @data: file system specific data | |
38 | * | |
39 | */ | |
40 | ||
41 | static int v9fs_set_super(struct super_block *s, void *data) | |
42 | { | |
43 | s->s_fs_info = data; | |
44 | return set_anon_super(s, data); | |
45 | } | |
46 | ||
47 | /** | |
48 | * v9fs_fill_super - populate superblock with info | |
49 | * @sb: superblock | |
50 | * @v9ses: session information | |
d2d1ea93 | 51 | * @flags: flags propagated from v9fs_mount() |
9e82cf6a EVH |
52 | * |
53 | */ | |
54 | ||
71304feb | 55 | static int |
9e82cf6a | 56 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
aafee43b | 57 | int flags) |
9e82cf6a | 58 | { |
71304feb JK |
59 | int ret; |
60 | ||
9e82cf6a EVH |
61 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
62 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
63 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
64 | sb->s_magic = V9FS_MAGIC; | |
ebf46264 | 65 | if (v9fs_proto_dotl(v9ses)) { |
9b6533c9 | 66 | sb->s_op = &v9fs_super_ops_dotl; |
ebf46264 | 67 | sb->s_xattr = v9fs_xattr_handlers; |
d5c6e2d5 | 68 | } else { |
9b6533c9 | 69 | sb->s_op = &v9fs_super_ops; |
d5c6e2d5 DD |
70 | sb->s_time_max = U32_MAX; |
71 | } | |
72 | ||
73 | sb->s_time_min = 0; | |
71304feb JK |
74 | |
75 | ret = super_setup_bdi(sb); | |
76 | if (ret) | |
77 | return ret; | |
78 | ||
55b2598e CH |
79 | if (!v9ses->cache) { |
80 | sb->s_bdi->ra_pages = 0; | |
81 | sb->s_bdi->io_pages = 0; | |
b1843d23 DM |
82 | } else { |
83 | sb->s_bdi->ra_pages = v9ses->maxdata >> PAGE_SHIFT; | |
84 | sb->s_bdi->io_pages = v9ses->maxdata >> PAGE_SHIFT; | |
55b2598e | 85 | } |
9e82cf6a | 86 | |
7ff3c204 | 87 | sb->s_flags |= SB_ACTIVE | SB_DIRSYNC; |
db5841d4 | 88 | if (!v9ses->cache) |
1751e8a6 | 89 | sb->s_flags |= SB_SYNCHRONOUS; |
4b53e4b5 | 90 | |
85ff872d | 91 | #ifdef CONFIG_9P_FS_POSIX_ACL |
e782ef71 | 92 | if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL) |
1751e8a6 | 93 | sb->s_flags |= SB_POSIXACL; |
85ff872d AK |
94 | #endif |
95 | ||
71304feb | 96 | return 0; |
9e82cf6a EVH |
97 | } |
98 | ||
99 | /** | |
d2d1ea93 | 100 | * v9fs_mount - mount a superblock |
9e82cf6a EVH |
101 | * @fs_type: file system type |
102 | * @flags: mount flags | |
103 | * @dev_name: device name that was mounted | |
104 | * @data: mount options | |
105 | * | |
106 | */ | |
107 | ||
d2d1ea93 AV |
108 | static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags, |
109 | const char *dev_name, void *data) | |
9e82cf6a EVH |
110 | { |
111 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
112 | struct inode *inode = NULL; |
113 | struct dentry *root = NULL; | |
114 | struct v9fs_session_info *v9ses = NULL; | |
6e195b0f | 115 | umode_t mode = 0777 | S_ISVTX; |
bd238fb4 | 116 | struct p9_fid *fid; |
9e82cf6a EVH |
117 | int retval = 0; |
118 | ||
5d385153 | 119 | p9_debug(P9_DEBUG_VFS, "\n"); |
9e82cf6a | 120 | |
1dac06b2 | 121 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 122 | if (!v9ses) |
d2d1ea93 | 123 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 124 | |
bd238fb4 LI |
125 | fid = v9fs_session_init(v9ses, dev_name, data); |
126 | if (IS_ERR(fid)) { | |
127 | retval = PTR_ERR(fid); | |
412a19b6 | 128 | goto free_session; |
bd238fb4 LI |
129 | } |
130 | ||
9249e17f | 131 | sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses); |
454e2398 DH |
132 | if (IS_ERR(sb)) { |
133 | retval = PTR_ERR(sb); | |
f0853122 | 134 | goto clunk_fid; |
454e2398 | 135 | } |
aafee43b | 136 | retval = v9fs_fill_super(sb, v9ses, flags); |
71304feb JK |
137 | if (retval) |
138 | goto release_sb; | |
9e82cf6a | 139 | |
fb89b45c | 140 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
98cd3fb0 AV |
141 | sb->s_d_op = &v9fs_cached_dentry_operations; |
142 | else | |
143 | sb->s_d_op = &v9fs_dentry_operations; | |
144 | ||
45089142 | 145 | inode = v9fs_get_inode(sb, S_IFDIR | mode, 0); |
9e82cf6a EVH |
146 | if (IS_ERR(inode)) { |
147 | retval = PTR_ERR(inode); | |
887b3ece | 148 | goto release_sb; |
9e82cf6a | 149 | } |
df5d8c80 | 150 | |
48fde701 | 151 | root = d_make_root(inode); |
9e82cf6a EVH |
152 | if (!root) { |
153 | retval = -ENOMEM; | |
887b3ece | 154 | goto release_sb; |
9e82cf6a | 155 | } |
9e82cf6a | 156 | sb->s_root = root; |
f0853122 SK |
157 | if (v9fs_proto_dotl(v9ses)) { |
158 | struct p9_stat_dotl *st = NULL; | |
6e195b0f | 159 | |
f0853122 SK |
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; | |
6e195b0f | 170 | |
f0853122 SK |
171 | st = p9_client_stat(fid); |
172 | if (IS_ERR(st)) { | |
173 | retval = PTR_ERR(st); | |
5c25f347 | 174 | goto release_sb; |
f0853122 SK |
175 | } |
176 | ||
2b0143b5 | 177 | d_inode(root)->i_ino = v9fs_qid2ino(&st->qid); |
5e3cc1ee | 178 | v9fs_stat2inode(st, d_inode(root), sb, 0); |
f0853122 SK |
179 | |
180 | p9stat_free(st); | |
181 | kfree(st); | |
182 | } | |
85ff872d AK |
183 | retval = v9fs_get_acl(inode, fid); |
184 | if (retval) | |
185 | goto release_sb; | |
dafbe689 | 186 | v9fs_fid_add(root, &fid); |
9e82cf6a | 187 | |
5d385153 | 188 | p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
d2d1ea93 | 189 | return dget(sb->s_root); |
9e82cf6a | 190 | |
887b3ece | 191 | clunk_fid: |
b48dbb99 | 192 | p9_fid_put(fid); |
887b3ece | 193 | v9fs_session_close(v9ses); |
412a19b6 | 194 | free_session: |
887b3ece | 195 | kfree(v9ses); |
d2d1ea93 | 196 | return ERR_PTR(retval); |
df5d8c80 | 197 | |
1b5ab3e8 | 198 | release_sb: |
5c25f347 | 199 | /* |
df5d8c80 AK |
200 | * we will do the session_close and root dentry release |
201 | * in the below call. But we need to clunk fid, because we haven't | |
202 | * attached the fid to dentry so it won't get clunked | |
203 | * automatically. | |
5c25f347 | 204 | */ |
b48dbb99 | 205 | p9_fid_put(fid); |
1b5ab3e8 | 206 | deactivate_locked_super(sb); |
d2d1ea93 | 207 | return ERR_PTR(retval); |
9e82cf6a EVH |
208 | } |
209 | ||
210 | /** | |
211 | * v9fs_kill_super - Kill Superblock | |
212 | * @s: superblock | |
213 | * | |
214 | */ | |
215 | ||
216 | static void v9fs_kill_super(struct super_block *s) | |
217 | { | |
218 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
219 | ||
5d385153 | 220 | p9_debug(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 221 | |
9e82cf6a | 222 | kill_anon_super(s); |
df5d8c80 | 223 | |
6d96d3ab | 224 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
225 | v9fs_session_close(v9ses); |
226 | kfree(v9ses); | |
1b5ab3e8 | 227 | s->s_fs_info = NULL; |
5d385153 | 228 | p9_debug(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
229 | } |
230 | ||
322b329a | 231 | static void |
42faad99 | 232 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 233 | { |
67e55205 | 234 | struct v9fs_session_info *v9ses; |
322b329a | 235 | |
67e55205 | 236 | v9ses = sb->s_fs_info; |
6d96d3ab | 237 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
238 | } |
239 | ||
bda8e775 SK |
240 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
241 | { | |
242 | struct v9fs_session_info *v9ses; | |
243 | struct p9_fid *fid; | |
244 | struct p9_rstatfs rs; | |
245 | int res; | |
246 | ||
247 | fid = v9fs_fid_lookup(dentry); | |
248 | if (IS_ERR(fid)) { | |
249 | res = PTR_ERR(fid); | |
250 | goto done; | |
251 | } | |
252 | ||
42869c8a | 253 | v9ses = v9fs_dentry2v9ses(dentry); |
bda8e775 SK |
254 | if (v9fs_proto_dotl(v9ses)) { |
255 | res = p9_client_statfs(fid, &rs); | |
256 | if (res == 0) { | |
5bdad933 | 257 | buf->f_type = rs.type; |
bda8e775 SK |
258 | buf->f_bsize = rs.bsize; |
259 | buf->f_blocks = rs.blocks; | |
260 | buf->f_bfree = rs.bfree; | |
261 | buf->f_bavail = rs.bavail; | |
262 | buf->f_files = rs.files; | |
263 | buf->f_ffree = rs.ffree; | |
6d1349c7 | 264 | buf->f_fsid = u64_to_fsid(rs.fsid); |
bda8e775 SK |
265 | buf->f_namelen = rs.namelen; |
266 | } | |
267 | if (res != -ENOSYS) | |
268 | goto done; | |
269 | } | |
270 | res = simple_statfs(dentry, buf); | |
271 | done: | |
b48dbb99 | 272 | p9_fid_put(fid); |
bda8e775 SK |
273 | return res; |
274 | } | |
275 | ||
edd73cf5 AK |
276 | static int v9fs_drop_inode(struct inode *inode) |
277 | { | |
278 | struct v9fs_session_info *v9ses; | |
6e195b0f | 279 | |
edd73cf5 | 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 | |
6e195b0f | 285 | * inode because we want the inode attribute |
edd73cf5 AK |
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 | } | |
93c84614 | 312 | fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode)); |
c2ed3880 AK |
313 | return 0; |
314 | } | |
315 | ||
316 | static int v9fs_write_inode_dotl(struct inode *inode, | |
317 | struct writeback_control *wbc) | |
318 | { | |
319 | int ret; | |
320 | struct v9fs_inode *v9inode; | |
321 | /* | |
322 | * send an fsync request to server irrespective of | |
323 | * wbc->sync_mode. | |
324 | */ | |
c2ed3880 | 325 | v9inode = V9FS_I(inode); |
fb89b45c DM |
326 | p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n", |
327 | __func__, inode, v9inode->writeback_fid); | |
c2ed3880 AK |
328 | if (!v9inode->writeback_fid) |
329 | return 0; | |
fb89b45c | 330 | |
c2ed3880 AK |
331 | ret = p9_client_fsync(v9inode->writeback_fid, 0); |
332 | if (ret < 0) { | |
333 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
334 | return ret; | |
335 | } | |
93c84614 | 336 | fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode)); |
c2ed3880 AK |
337 | return 0; |
338 | } | |
339 | ||
ee9b6d61 | 340 | static const struct super_operations v9fs_super_ops = { |
60e78d2c | 341 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 342 | .free_inode = v9fs_free_inode, |
9e82cf6a | 343 | .statfs = simple_statfs, |
b57922d9 | 344 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 345 | .show_options = v9fs_show_options, |
322b329a | 346 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 347 | .write_inode = v9fs_write_inode, |
9e82cf6a EVH |
348 | }; |
349 | ||
9b6533c9 | 350 | static const struct super_operations v9fs_super_ops_dotl = { |
9b6533c9 | 351 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 352 | .free_inode = v9fs_free_inode, |
bda8e775 | 353 | .statfs = v9fs_statfs, |
edd73cf5 | 354 | .drop_inode = v9fs_drop_inode, |
b57922d9 | 355 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 356 | .show_options = v9fs_show_options, |
9b6533c9 | 357 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 358 | .write_inode = v9fs_write_inode_dotl, |
9b6533c9 SK |
359 | }; |
360 | ||
9e82cf6a | 361 | struct file_system_type v9fs_fs_type = { |
67543e50 | 362 | .name = "9p", |
d2d1ea93 | 363 | .mount = v9fs_mount, |
9e82cf6a EVH |
364 | .kill_sb = v9fs_kill_super, |
365 | .owner = THIS_MODULE, | |
ecf3d1f1 | 366 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 367 | }; |
7f78e035 | 368 | MODULE_ALIAS_FS("9p"); |