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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 | |
ee443996 | 71 | * @flags: flags propagated from v9fs_get_sb() |
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; |
9e82cf6a EVH |
89 | |
90 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
0d456fa4 | 91 | MS_NOATIME; |
4b53e4b5 | 92 | |
85ff872d | 93 | #ifdef CONFIG_9P_FS_POSIX_ACL |
76381a42 AK |
94 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT) |
95 | sb->s_flags |= MS_POSIXACL; | |
85ff872d AK |
96 | #endif |
97 | ||
4b53e4b5 | 98 | save_mount_options(sb, data); |
9e82cf6a EVH |
99 | } |
100 | ||
101 | /** | |
102 | * v9fs_get_sb - mount a superblock | |
103 | * @fs_type: file system type | |
104 | * @flags: mount flags | |
105 | * @dev_name: device name that was mounted | |
106 | * @data: mount options | |
454e2398 | 107 | * @mnt: mountpoint record to be instantiated |
9e82cf6a EVH |
108 | * |
109 | */ | |
110 | ||
454e2398 DH |
111 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
112 | const char *dev_name, void *data, | |
113 | struct vfsmount *mnt) | |
9e82cf6a EVH |
114 | { |
115 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
116 | struct inode *inode = NULL; |
117 | struct dentry *root = NULL; | |
118 | struct v9fs_session_info *v9ses = NULL; | |
9e82cf6a | 119 | int mode = S_IRWXUGO | S_ISVTX; |
bd238fb4 | 120 | struct p9_fid *fid; |
9e82cf6a EVH |
121 | int retval = 0; |
122 | ||
bd238fb4 | 123 | P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
9e82cf6a | 124 | |
1dac06b2 | 125 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 126 | if (!v9ses) |
454e2398 | 127 | return -ENOMEM; |
9e82cf6a | 128 | |
bd238fb4 LI |
129 | fid = v9fs_session_init(v9ses, dev_name, data); |
130 | if (IS_ERR(fid)) { | |
131 | retval = PTR_ERR(fid); | |
5c25f347 AK |
132 | /* |
133 | * we need to call session_close to tear down some | |
134 | * of the data structure setup by session_init | |
135 | */ | |
887b3ece | 136 | goto close_session; |
bd238fb4 LI |
137 | } |
138 | ||
9e82cf6a | 139 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
454e2398 DH |
140 | if (IS_ERR(sb)) { |
141 | retval = PTR_ERR(sb); | |
f0853122 | 142 | goto clunk_fid; |
454e2398 | 143 | } |
4b53e4b5 | 144 | v9fs_fill_super(sb, v9ses, flags, data); |
9e82cf6a EVH |
145 | |
146 | inode = v9fs_get_inode(sb, S_IFDIR | mode); | |
147 | if (IS_ERR(inode)) { | |
148 | retval = PTR_ERR(inode); | |
887b3ece | 149 | goto release_sb; |
9e82cf6a EVH |
150 | } |
151 | ||
9e82cf6a | 152 | root = d_alloc_root(inode); |
9e82cf6a | 153 | if (!root) { |
c96f5857 | 154 | iput(inode); |
9e82cf6a | 155 | retval = -ENOMEM; |
887b3ece | 156 | goto release_sb; |
9e82cf6a | 157 | } |
9e82cf6a | 158 | sb->s_root = root; |
f0853122 SK |
159 | if (v9fs_proto_dotl(v9ses)) { |
160 | struct p9_stat_dotl *st = NULL; | |
161 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
162 | if (IS_ERR(st)) { | |
163 | retval = PTR_ERR(st); | |
5c25f347 | 164 | goto release_sb; |
f0853122 SK |
165 | } |
166 | ||
167 | v9fs_stat2inode_dotl(st, root->d_inode); | |
168 | kfree(st); | |
169 | } else { | |
170 | struct p9_wstat *st = NULL; | |
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 | ||
177 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); | |
178 | v9fs_stat2inode(st, root->d_inode, sb); | |
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; | |
bd238fb4 | 186 | v9fs_fid_add(root, fid); |
9e82cf6a | 187 | |
5c25f347 | 188 | P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
a3ec947c SB |
189 | simple_set_mnt(mnt, sb); |
190 | return 0; | |
9e82cf6a | 191 | |
887b3ece EVH |
192 | clunk_fid: |
193 | p9_client_clunk(fid); | |
887b3ece EVH |
194 | close_session: |
195 | v9fs_session_close(v9ses); | |
196 | kfree(v9ses); | |
1b5ab3e8 | 197 | return retval; |
1b5ab3e8 | 198 | release_sb: |
5c25f347 AK |
199 | /* |
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. | |
204 | */ | |
205 | p9_client_clunk(fid); | |
1b5ab3e8 | 206 | deactivate_locked_super(sb); |
454e2398 | 207 | return 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 | ||
bd238fb4 | 220 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 221 | |
083c73c2 AV |
222 | if (s->s_root) |
223 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
9e82cf6a EVH |
224 | |
225 | kill_anon_super(s); | |
226 | ||
6d96d3ab | 227 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
228 | v9fs_session_close(v9ses); |
229 | kfree(v9ses); | |
1b5ab3e8 | 230 | s->s_fs_info = NULL; |
bd238fb4 | 231 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
232 | } |
233 | ||
322b329a | 234 | static void |
42faad99 | 235 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 236 | { |
67e55205 | 237 | struct v9fs_session_info *v9ses; |
322b329a | 238 | |
67e55205 | 239 | v9ses = sb->s_fs_info; |
6d96d3ab | 240 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
241 | } |
242 | ||
bda8e775 SK |
243 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
244 | { | |
245 | struct v9fs_session_info *v9ses; | |
246 | struct p9_fid *fid; | |
247 | struct p9_rstatfs rs; | |
248 | int res; | |
249 | ||
250 | fid = v9fs_fid_lookup(dentry); | |
251 | if (IS_ERR(fid)) { | |
252 | res = PTR_ERR(fid); | |
253 | goto done; | |
254 | } | |
255 | ||
256 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
257 | if (v9fs_proto_dotl(v9ses)) { | |
258 | res = p9_client_statfs(fid, &rs); | |
259 | if (res == 0) { | |
368c09d2 | 260 | buf->f_type = V9FS_MAGIC; |
bda8e775 SK |
261 | buf->f_bsize = rs.bsize; |
262 | buf->f_blocks = rs.blocks; | |
263 | buf->f_bfree = rs.bfree; | |
264 | buf->f_bavail = rs.bavail; | |
265 | buf->f_files = rs.files; | |
266 | buf->f_ffree = rs.ffree; | |
267 | buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL; | |
268 | buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL; | |
269 | buf->f_namelen = rs.namelen; | |
270 | } | |
271 | if (res != -ENOSYS) | |
272 | goto done; | |
273 | } | |
274 | res = simple_statfs(dentry, buf); | |
275 | done: | |
276 | return res; | |
277 | } | |
278 | ||
ee9b6d61 | 279 | static const struct super_operations v9fs_super_ops = { |
60e78d2c AK |
280 | #ifdef CONFIG_9P_FSCACHE |
281 | .alloc_inode = v9fs_alloc_inode, | |
282 | .destroy_inode = v9fs_destroy_inode, | |
283 | #endif | |
9e82cf6a | 284 | .statfs = simple_statfs, |
b57922d9 | 285 | .evict_inode = v9fs_evict_inode, |
4b53e4b5 | 286 | .show_options = generic_show_options, |
322b329a | 287 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
288 | }; |
289 | ||
9b6533c9 SK |
290 | static const struct super_operations v9fs_super_ops_dotl = { |
291 | #ifdef CONFIG_9P_FSCACHE | |
292 | .alloc_inode = v9fs_alloc_inode, | |
293 | .destroy_inode = v9fs_destroy_inode, | |
294 | #endif | |
bda8e775 | 295 | .statfs = v9fs_statfs, |
b57922d9 | 296 | .evict_inode = v9fs_evict_inode, |
9b6533c9 SK |
297 | .show_options = generic_show_options, |
298 | .umount_begin = v9fs_umount_begin, | |
299 | }; | |
300 | ||
9e82cf6a | 301 | struct file_system_type v9fs_fs_type = { |
67543e50 | 302 | .name = "9p", |
9e82cf6a EVH |
303 | .get_sb = v9fs_get_sb, |
304 | .kill_sb = v9fs_kill_super, | |
305 | .owner = THIS_MODULE, | |
a534c8d1 | 306 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 307 | }; |