Commit | Line | Data |
---|---|---|
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 | 15 | #include <linux/pagemap.h> |
9e82cf6a | 16 | #include <linux/mount.h> |
e8edc6e0 | 17 | #include <linux/sched.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bda8e775 | 19 | #include <linux/statfs.h> |
368c09d2 | 20 | #include <linux/magic.h> |
93c84614 | 21 | #include <linux/fscache.h> |
bd238fb4 LI |
22 | #include <net/9p/9p.h> |
23 | #include <net/9p/client.h> | |
9e82cf6a | 24 | |
9e82cf6a | 25 | #include "v9fs.h" |
9e82cf6a | 26 | #include "v9fs_vfs.h" |
9e82cf6a | 27 | #include "fid.h" |
ebf46264 | 28 | #include "xattr.h" |
85ff872d | 29 | #include "acl.h" |
9e82cf6a | 30 | |
9b6533c9 | 31 | static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
9e82cf6a | 32 | |
9e82cf6a EVH |
33 | /** |
34 | * v9fs_set_super - set the superblock | |
35 | * @s: super block | |
36 | * @data: file system specific data | |
37 | * | |
38 | */ | |
39 | ||
40 | static int v9fs_set_super(struct super_block *s, void *data) | |
41 | { | |
42 | s->s_fs_info = data; | |
43 | return set_anon_super(s, data); | |
44 | } | |
45 | ||
46 | /** | |
47 | * v9fs_fill_super - populate superblock with info | |
48 | * @sb: superblock | |
49 | * @v9ses: session information | |
d2d1ea93 | 50 | * @flags: flags propagated from v9fs_mount() |
9e82cf6a EVH |
51 | * |
52 | */ | |
53 | ||
71304feb | 54 | static int |
9e82cf6a | 55 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
aafee43b | 56 | int flags) |
9e82cf6a | 57 | { |
71304feb JK |
58 | int ret; |
59 | ||
9e82cf6a EVH |
60 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
61 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
62 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
63 | sb->s_magic = V9FS_MAGIC; | |
ebf46264 | 64 | if (v9fs_proto_dotl(v9ses)) { |
9b6533c9 | 65 | sb->s_op = &v9fs_super_ops_dotl; |
8142db4f EVH |
66 | if (!(v9ses->flags & V9FS_NO_XATTR)) |
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 | |
740b8bf8 | 87 | sb->s_flags |= SB_ACTIVE; |
4b53e4b5 | 88 | |
85ff872d | 89 | #ifdef CONFIG_9P_FS_POSIX_ACL |
e782ef71 | 90 | if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL) |
1751e8a6 | 91 | sb->s_flags |= SB_POSIXACL; |
85ff872d AK |
92 | #endif |
93 | ||
71304feb | 94 | return 0; |
9e82cf6a EVH |
95 | } |
96 | ||
97 | /** | |
d2d1ea93 | 98 | * v9fs_mount - mount a superblock |
9e82cf6a EVH |
99 | * @fs_type: file system type |
100 | * @flags: mount flags | |
101 | * @dev_name: device name that was mounted | |
102 | * @data: mount options | |
103 | * | |
104 | */ | |
105 | ||
d2d1ea93 AV |
106 | static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags, |
107 | const char *dev_name, void *data) | |
9e82cf6a EVH |
108 | { |
109 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
110 | struct inode *inode = NULL; |
111 | struct dentry *root = NULL; | |
112 | struct v9fs_session_info *v9ses = NULL; | |
6e195b0f | 113 | umode_t mode = 0777 | S_ISVTX; |
bd238fb4 | 114 | struct p9_fid *fid; |
9e82cf6a EVH |
115 | int retval = 0; |
116 | ||
5d385153 | 117 | p9_debug(P9_DEBUG_VFS, "\n"); |
9e82cf6a | 118 | |
1dac06b2 | 119 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 120 | if (!v9ses) |
d2d1ea93 | 121 | return ERR_PTR(-ENOMEM); |
9e82cf6a | 122 | |
bd238fb4 LI |
123 | fid = v9fs_session_init(v9ses, dev_name, data); |
124 | if (IS_ERR(fid)) { | |
125 | retval = PTR_ERR(fid); | |
412a19b6 | 126 | goto free_session; |
bd238fb4 LI |
127 | } |
128 | ||
9249e17f | 129 | sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses); |
454e2398 DH |
130 | if (IS_ERR(sb)) { |
131 | retval = PTR_ERR(sb); | |
f0853122 | 132 | goto clunk_fid; |
454e2398 | 133 | } |
aafee43b | 134 | retval = v9fs_fill_super(sb, v9ses, flags); |
71304feb JK |
135 | if (retval) |
136 | goto release_sb; | |
9e82cf6a | 137 | |
4eb31178 | 138 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) |
98cd3fb0 AV |
139 | sb->s_d_op = &v9fs_cached_dentry_operations; |
140 | else | |
141 | sb->s_d_op = &v9fs_dentry_operations; | |
142 | ||
45089142 | 143 | inode = v9fs_get_inode(sb, S_IFDIR | mode, 0); |
9e82cf6a EVH |
144 | if (IS_ERR(inode)) { |
145 | retval = PTR_ERR(inode); | |
887b3ece | 146 | goto release_sb; |
9e82cf6a | 147 | } |
df5d8c80 | 148 | |
48fde701 | 149 | root = d_make_root(inode); |
9e82cf6a EVH |
150 | if (!root) { |
151 | retval = -ENOMEM; | |
887b3ece | 152 | goto release_sb; |
9e82cf6a | 153 | } |
9e82cf6a | 154 | sb->s_root = root; |
f0853122 SK |
155 | if (v9fs_proto_dotl(v9ses)) { |
156 | struct p9_stat_dotl *st = NULL; | |
6e195b0f | 157 | |
f0853122 SK |
158 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); |
159 | if (IS_ERR(st)) { | |
160 | retval = PTR_ERR(st); | |
5c25f347 | 161 | goto release_sb; |
f0853122 | 162 | } |
2b0143b5 | 163 | d_inode(root)->i_ino = v9fs_qid2ino(&st->qid); |
5e3cc1ee | 164 | v9fs_stat2inode_dotl(st, d_inode(root), 0); |
f0853122 SK |
165 | kfree(st); |
166 | } else { | |
167 | struct p9_wstat *st = NULL; | |
6e195b0f | 168 | |
f0853122 SK |
169 | st = p9_client_stat(fid); |
170 | if (IS_ERR(st)) { | |
171 | retval = PTR_ERR(st); | |
5c25f347 | 172 | goto release_sb; |
f0853122 SK |
173 | } |
174 | ||
2b0143b5 | 175 | d_inode(root)->i_ino = v9fs_qid2ino(&st->qid); |
5e3cc1ee | 176 | v9fs_stat2inode(st, d_inode(root), sb, 0); |
f0853122 SK |
177 | |
178 | p9stat_free(st); | |
179 | kfree(st); | |
180 | } | |
85ff872d AK |
181 | retval = v9fs_get_acl(inode, fid); |
182 | if (retval) | |
183 | goto release_sb; | |
dafbe689 | 184 | v9fs_fid_add(root, &fid); |
9e82cf6a | 185 | |
5d385153 | 186 | p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
d2d1ea93 | 187 | return dget(sb->s_root); |
9e82cf6a | 188 | |
887b3ece | 189 | clunk_fid: |
b48dbb99 | 190 | p9_fid_put(fid); |
887b3ece | 191 | v9fs_session_close(v9ses); |
412a19b6 | 192 | free_session: |
887b3ece | 193 | kfree(v9ses); |
d2d1ea93 | 194 | return ERR_PTR(retval); |
df5d8c80 | 195 | |
1b5ab3e8 | 196 | release_sb: |
5c25f347 | 197 | /* |
df5d8c80 AK |
198 | * we will do the session_close and root dentry release |
199 | * in the below call. But we need to clunk fid, because we haven't | |
200 | * attached the fid to dentry so it won't get clunked | |
201 | * automatically. | |
5c25f347 | 202 | */ |
b48dbb99 | 203 | p9_fid_put(fid); |
1b5ab3e8 | 204 | deactivate_locked_super(sb); |
d2d1ea93 | 205 | return ERR_PTR(retval); |
9e82cf6a EVH |
206 | } |
207 | ||
208 | /** | |
209 | * v9fs_kill_super - Kill Superblock | |
210 | * @s: superblock | |
211 | * | |
212 | */ | |
213 | ||
214 | static void v9fs_kill_super(struct super_block *s) | |
215 | { | |
216 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
217 | ||
5d385153 | 218 | p9_debug(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 219 | |
9e82cf6a | 220 | kill_anon_super(s); |
df5d8c80 | 221 | |
6d96d3ab | 222 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
223 | v9fs_session_close(v9ses); |
224 | kfree(v9ses); | |
1b5ab3e8 | 225 | s->s_fs_info = NULL; |
5d385153 | 226 | p9_debug(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
227 | } |
228 | ||
322b329a | 229 | static void |
42faad99 | 230 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 231 | { |
67e55205 | 232 | struct v9fs_session_info *v9ses; |
322b329a | 233 | |
67e55205 | 234 | v9ses = sb->s_fs_info; |
6d96d3ab | 235 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
236 | } |
237 | ||
bda8e775 SK |
238 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
239 | { | |
240 | struct v9fs_session_info *v9ses; | |
241 | struct p9_fid *fid; | |
242 | struct p9_rstatfs rs; | |
243 | int res; | |
244 | ||
245 | fid = v9fs_fid_lookup(dentry); | |
246 | if (IS_ERR(fid)) { | |
247 | res = PTR_ERR(fid); | |
248 | goto done; | |
249 | } | |
250 | ||
42869c8a | 251 | v9ses = v9fs_dentry2v9ses(dentry); |
bda8e775 SK |
252 | if (v9fs_proto_dotl(v9ses)) { |
253 | res = p9_client_statfs(fid, &rs); | |
254 | if (res == 0) { | |
5bdad933 | 255 | buf->f_type = rs.type; |
bda8e775 SK |
256 | buf->f_bsize = rs.bsize; |
257 | buf->f_blocks = rs.blocks; | |
258 | buf->f_bfree = rs.bfree; | |
259 | buf->f_bavail = rs.bavail; | |
260 | buf->f_files = rs.files; | |
261 | buf->f_ffree = rs.ffree; | |
6d1349c7 | 262 | buf->f_fsid = u64_to_fsid(rs.fsid); |
bda8e775 SK |
263 | buf->f_namelen = rs.namelen; |
264 | } | |
265 | if (res != -ENOSYS) | |
266 | goto done; | |
267 | } | |
268 | res = simple_statfs(dentry, buf); | |
269 | done: | |
b48dbb99 | 270 | p9_fid_put(fid); |
bda8e775 SK |
271 | return res; |
272 | } | |
273 | ||
edd73cf5 AK |
274 | static int v9fs_drop_inode(struct inode *inode) |
275 | { | |
276 | struct v9fs_session_info *v9ses; | |
6e195b0f | 277 | |
edd73cf5 | 278 | v9ses = v9fs_inode2v9ses(inode); |
4eb31178 | 279 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) |
edd73cf5 AK |
280 | return generic_drop_inode(inode); |
281 | /* | |
282 | * in case of non cached mode always drop the | |
6e195b0f | 283 | * inode because we want the inode attribute |
edd73cf5 AK |
284 | * to always match that on the server. |
285 | */ | |
286 | return 1; | |
287 | } | |
288 | ||
c2ed3880 AK |
289 | static int v9fs_write_inode(struct inode *inode, |
290 | struct writeback_control *wbc) | |
291 | { | |
c2ed3880 | 292 | struct v9fs_inode *v9inode; |
1543b4c5 | 293 | |
c2ed3880 AK |
294 | /* |
295 | * send an fsync request to server irrespective of | |
296 | * wbc->sync_mode. | |
297 | */ | |
5d385153 | 298 | p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode); |
c2ed3880 | 299 | |
1543b4c5 | 300 | v9inode = V9FS_I(inode); |
93c84614 | 301 | fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode)); |
1543b4c5 | 302 | |
c2ed3880 AK |
303 | return 0; |
304 | } | |
305 | ||
306 | static int v9fs_write_inode_dotl(struct inode *inode, | |
307 | struct writeback_control *wbc) | |
308 | { | |
c2ed3880 | 309 | struct v9fs_inode *v9inode; |
1543b4c5 | 310 | |
c2ed3880 | 311 | v9inode = V9FS_I(inode); |
1543b4c5 EVH |
312 | p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode); |
313 | ||
93c84614 | 314 | fscache_unpin_writeback(wbc, v9fs_inode_cookie(v9inode)); |
1543b4c5 | 315 | |
c2ed3880 AK |
316 | return 0; |
317 | } | |
318 | ||
ee9b6d61 | 319 | static const struct super_operations v9fs_super_ops = { |
60e78d2c | 320 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 321 | .free_inode = v9fs_free_inode, |
9e82cf6a | 322 | .statfs = simple_statfs, |
b57922d9 | 323 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 324 | .show_options = v9fs_show_options, |
322b329a | 325 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 326 | .write_inode = v9fs_write_inode, |
9e82cf6a EVH |
327 | }; |
328 | ||
9b6533c9 | 329 | static const struct super_operations v9fs_super_ops_dotl = { |
9b6533c9 | 330 | .alloc_inode = v9fs_alloc_inode, |
5e8a0770 | 331 | .free_inode = v9fs_free_inode, |
bda8e775 | 332 | .statfs = v9fs_statfs, |
edd73cf5 | 333 | .drop_inode = v9fs_drop_inode, |
b57922d9 | 334 | .evict_inode = v9fs_evict_inode, |
c4fac910 | 335 | .show_options = v9fs_show_options, |
9b6533c9 | 336 | .umount_begin = v9fs_umount_begin, |
c2ed3880 | 337 | .write_inode = v9fs_write_inode_dotl, |
9b6533c9 SK |
338 | }; |
339 | ||
9e82cf6a | 340 | struct file_system_type v9fs_fs_type = { |
67543e50 | 341 | .name = "9p", |
d2d1ea93 | 342 | .mount = v9fs_mount, |
9e82cf6a EVH |
343 | .kill_sb = v9fs_kill_super, |
344 | .owner = THIS_MODULE, | |
ecf3d1f1 | 345 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 346 | }; |
7f78e035 | 347 | MODULE_ALIAS_FS("9p"); |