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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> |
bd238fb4 LI |
42 | #include <net/9p/9p.h> |
43 | #include <net/9p/client.h> | |
9e82cf6a | 44 | |
9e82cf6a | 45 | #include "v9fs.h" |
9e82cf6a | 46 | #include "v9fs_vfs.h" |
9e82cf6a | 47 | #include "fid.h" |
ebf46264 | 48 | #include "xattr.h" |
85ff872d | 49 | #include "acl.h" |
9e82cf6a | 50 | |
9b6533c9 | 51 | static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
9e82cf6a | 52 | |
9e82cf6a EVH |
53 | /** |
54 | * v9fs_set_super - set the superblock | |
55 | * @s: super block | |
56 | * @data: file system specific data | |
57 | * | |
58 | */ | |
59 | ||
60 | static int v9fs_set_super(struct super_block *s, void *data) | |
61 | { | |
62 | s->s_fs_info = data; | |
63 | return set_anon_super(s, data); | |
64 | } | |
65 | ||
66 | /** | |
67 | * v9fs_fill_super - populate superblock with info | |
68 | * @sb: superblock | |
69 | * @v9ses: session information | |
ee443996 | 70 | * @flags: flags propagated from v9fs_get_sb() |
9e82cf6a EVH |
71 | * |
72 | */ | |
73 | ||
74 | static void | |
75 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, | |
4b53e4b5 | 76 | int flags, void *data) |
9e82cf6a EVH |
77 | { |
78 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
79 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
80 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
81 | sb->s_magic = V9FS_MAGIC; | |
ebf46264 | 82 | if (v9fs_proto_dotl(v9ses)) { |
9b6533c9 | 83 | sb->s_op = &v9fs_super_ops_dotl; |
ebf46264 AK |
84 | sb->s_xattr = v9fs_xattr_handlers; |
85 | } else | |
9b6533c9 | 86 | sb->s_op = &v9fs_super_ops; |
0ed07ddb | 87 | sb->s_bdi = &v9ses->bdi; |
9e82cf6a EVH |
88 | |
89 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
0d456fa4 | 90 | MS_NOATIME; |
4b53e4b5 | 91 | |
85ff872d AK |
92 | #ifdef CONFIG_9P_FS_POSIX_ACL |
93 | sb->s_flags |= MS_POSIXACL; | |
94 | #endif | |
95 | ||
4b53e4b5 | 96 | save_mount_options(sb, data); |
9e82cf6a EVH |
97 | } |
98 | ||
99 | /** | |
100 | * v9fs_get_sb - mount a superblock | |
101 | * @fs_type: file system type | |
102 | * @flags: mount flags | |
103 | * @dev_name: device name that was mounted | |
104 | * @data: mount options | |
454e2398 | 105 | * @mnt: mountpoint record to be instantiated |
9e82cf6a EVH |
106 | * |
107 | */ | |
108 | ||
454e2398 DH |
109 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
110 | const char *dev_name, void *data, | |
111 | struct vfsmount *mnt) | |
9e82cf6a EVH |
112 | { |
113 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
114 | struct inode *inode = NULL; |
115 | struct dentry *root = NULL; | |
116 | struct v9fs_session_info *v9ses = NULL; | |
9e82cf6a | 117 | int mode = S_IRWXUGO | S_ISVTX; |
bd238fb4 | 118 | struct p9_fid *fid; |
9e82cf6a EVH |
119 | int retval = 0; |
120 | ||
bd238fb4 | 121 | P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
9e82cf6a | 122 | |
1dac06b2 | 123 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 124 | if (!v9ses) |
454e2398 | 125 | return -ENOMEM; |
9e82cf6a | 126 | |
bd238fb4 LI |
127 | fid = v9fs_session_init(v9ses, dev_name, data); |
128 | if (IS_ERR(fid)) { | |
129 | retval = PTR_ERR(fid); | |
5c25f347 AK |
130 | /* |
131 | * we need to call session_close to tear down some | |
132 | * of the data structure setup by session_init | |
133 | */ | |
887b3ece | 134 | goto close_session; |
bd238fb4 LI |
135 | } |
136 | ||
9e82cf6a | 137 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
454e2398 DH |
138 | if (IS_ERR(sb)) { |
139 | retval = PTR_ERR(sb); | |
f0853122 | 140 | goto clunk_fid; |
454e2398 | 141 | } |
4b53e4b5 | 142 | v9fs_fill_super(sb, v9ses, flags, data); |
9e82cf6a EVH |
143 | |
144 | inode = v9fs_get_inode(sb, S_IFDIR | mode); | |
145 | if (IS_ERR(inode)) { | |
146 | retval = PTR_ERR(inode); | |
887b3ece | 147 | goto release_sb; |
9e82cf6a EVH |
148 | } |
149 | ||
9e82cf6a | 150 | root = d_alloc_root(inode); |
9e82cf6a | 151 | if (!root) { |
c96f5857 | 152 | iput(inode); |
9e82cf6a | 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; | |
159 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); | |
160 | if (IS_ERR(st)) { | |
161 | retval = PTR_ERR(st); | |
5c25f347 | 162 | goto release_sb; |
f0853122 SK |
163 | } |
164 | ||
165 | v9fs_stat2inode_dotl(st, root->d_inode); | |
166 | kfree(st); | |
167 | } else { | |
168 | struct p9_wstat *st = NULL; | |
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 | ||
175 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); | |
176 | v9fs_stat2inode(st, root->d_inode, sb); | |
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; | |
51a87c55 | 184 | |
bd238fb4 | 185 | v9fs_fid_add(root, fid); |
9e82cf6a | 186 | |
5c25f347 | 187 | P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
a3ec947c SB |
188 | simple_set_mnt(mnt, sb); |
189 | return 0; | |
9e82cf6a | 190 | |
887b3ece EVH |
191 | clunk_fid: |
192 | p9_client_clunk(fid); | |
887b3ece EVH |
193 | close_session: |
194 | v9fs_session_close(v9ses); | |
195 | kfree(v9ses); | |
1b5ab3e8 | 196 | return retval; |
1b5ab3e8 | 197 | release_sb: |
5c25f347 AK |
198 | /* |
199 | * we will do the session_close and root dentry release | |
200 | * in the below call. But we need to clunk fid, because we haven't | |
201 | * attached the fid to dentry so it won't get clunked | |
202 | * automatically. | |
203 | */ | |
204 | p9_client_clunk(fid); | |
1b5ab3e8 | 205 | deactivate_locked_super(sb); |
454e2398 | 206 | return retval; |
9e82cf6a EVH |
207 | } |
208 | ||
209 | /** | |
210 | * v9fs_kill_super - Kill Superblock | |
211 | * @s: superblock | |
212 | * | |
213 | */ | |
214 | ||
215 | static void v9fs_kill_super(struct super_block *s) | |
216 | { | |
217 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
218 | ||
bd238fb4 | 219 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 220 | |
083c73c2 AV |
221 | if (s->s_root) |
222 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
9e82cf6a EVH |
223 | |
224 | kill_anon_super(s); | |
225 | ||
6d96d3ab | 226 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
227 | v9fs_session_close(v9ses); |
228 | kfree(v9ses); | |
1b5ab3e8 | 229 | s->s_fs_info = NULL; |
bd238fb4 | 230 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
231 | } |
232 | ||
322b329a | 233 | static void |
42faad99 | 234 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 235 | { |
67e55205 | 236 | struct v9fs_session_info *v9ses; |
322b329a | 237 | |
67e55205 | 238 | v9ses = sb->s_fs_info; |
6d96d3ab | 239 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
240 | } |
241 | ||
bda8e775 SK |
242 | static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
243 | { | |
244 | struct v9fs_session_info *v9ses; | |
245 | struct p9_fid *fid; | |
246 | struct p9_rstatfs rs; | |
247 | int res; | |
248 | ||
249 | fid = v9fs_fid_lookup(dentry); | |
250 | if (IS_ERR(fid)) { | |
251 | res = PTR_ERR(fid); | |
252 | goto done; | |
253 | } | |
254 | ||
255 | v9ses = v9fs_inode2v9ses(dentry->d_inode); | |
256 | if (v9fs_proto_dotl(v9ses)) { | |
257 | res = p9_client_statfs(fid, &rs); | |
258 | if (res == 0) { | |
259 | buf->f_type = rs.type; | |
260 | buf->f_bsize = rs.bsize; | |
261 | buf->f_blocks = rs.blocks; | |
262 | buf->f_bfree = rs.bfree; | |
263 | buf->f_bavail = rs.bavail; | |
264 | buf->f_files = rs.files; | |
265 | buf->f_ffree = rs.ffree; | |
266 | buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL; | |
267 | buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL; | |
268 | buf->f_namelen = rs.namelen; | |
269 | } | |
270 | if (res != -ENOSYS) | |
271 | goto done; | |
272 | } | |
273 | res = simple_statfs(dentry, buf); | |
274 | done: | |
275 | return res; | |
276 | } | |
277 | ||
ee9b6d61 | 278 | static const struct super_operations v9fs_super_ops = { |
60e78d2c AK |
279 | #ifdef CONFIG_9P_FSCACHE |
280 | .alloc_inode = v9fs_alloc_inode, | |
281 | .destroy_inode = v9fs_destroy_inode, | |
282 | #endif | |
9e82cf6a | 283 | .statfs = simple_statfs, |
b57922d9 | 284 | .evict_inode = v9fs_evict_inode, |
4b53e4b5 | 285 | .show_options = generic_show_options, |
322b329a | 286 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
287 | }; |
288 | ||
9b6533c9 SK |
289 | static const struct super_operations v9fs_super_ops_dotl = { |
290 | #ifdef CONFIG_9P_FSCACHE | |
291 | .alloc_inode = v9fs_alloc_inode, | |
292 | .destroy_inode = v9fs_destroy_inode, | |
293 | #endif | |
bda8e775 | 294 | .statfs = v9fs_statfs, |
b57922d9 | 295 | .evict_inode = v9fs_evict_inode, |
9b6533c9 SK |
296 | .show_options = generic_show_options, |
297 | .umount_begin = v9fs_umount_begin, | |
298 | }; | |
299 | ||
9e82cf6a | 300 | struct file_system_type v9fs_fs_type = { |
67543e50 | 301 | .name = "9p", |
9e82cf6a EVH |
302 | .get_sb = v9fs_get_sb, |
303 | .kill_sb = v9fs_kill_super, | |
304 | .owner = THIS_MODULE, | |
a534c8d1 | 305 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a | 306 | }; |