Blame view
fs/9p/vfs_super.c
6.84 KB
9e82cf6a8
|
1 2 3 4 5 6 7 8 9 10 |
/* * linux/fs/9p/vfs_super.c * * This file contians superblock ops for 9P2000. It is intended that * you mount this file system on directories. * * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify |
42e8c509c
|
11 12 |
* it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. |
9e82cf6a8
|
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 |
* * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/kernel.h> |
9e82cf6a8
|
28 29 30 31 32 33 |
#include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/stat.h> #include <linux/string.h> |
9e82cf6a8
|
34 35 36 37 38 |
#include <linux/inet.h> #include <linux/pagemap.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/idr.h> |
e8edc6e03
|
39 |
#include <linux/sched.h> |
5a0e3ad6a
|
40 |
#include <linux/slab.h> |
bda8e7752
|
41 |
#include <linux/statfs.h> |
bd238fb43
|
42 43 |
#include <net/9p/9p.h> #include <net/9p/client.h> |
9e82cf6a8
|
44 |
|
9e82cf6a8
|
45 |
#include "v9fs.h" |
9e82cf6a8
|
46 |
#include "v9fs_vfs.h" |
9e82cf6a8
|
47 |
#include "fid.h" |
ebf46264a
|
48 |
#include "xattr.h" |
9e82cf6a8
|
49 |
|
9b6533c9b
|
50 |
static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
9e82cf6a8
|
51 52 |
/** |
9e82cf6a8
|
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 |
* v9fs_set_super - set the superblock * @s: super block * @data: file system specific data * */ static int v9fs_set_super(struct super_block *s, void *data) { s->s_fs_info = data; return set_anon_super(s, data); } /** * v9fs_fill_super - populate superblock with info * @sb: superblock * @v9ses: session information |
ee443996a
|
69 |
* @flags: flags propagated from v9fs_get_sb() |
9e82cf6a8
|
70 71 72 73 74 |
* */ static void v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
4b53e4b50
|
75 |
int flags, void *data) |
9e82cf6a8
|
76 77 78 79 80 |
{ sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_blocksize_bits = fls(v9ses->maxdata - 1); sb->s_blocksize = 1 << sb->s_blocksize_bits; sb->s_magic = V9FS_MAGIC; |
ebf46264a
|
81 |
if (v9fs_proto_dotl(v9ses)) { |
9b6533c9b
|
82 |
sb->s_op = &v9fs_super_ops_dotl; |
ebf46264a
|
83 84 |
sb->s_xattr = v9fs_xattr_handlers; } else |
9b6533c9b
|
85 |
sb->s_op = &v9fs_super_ops; |
0ed07ddb5
|
86 |
sb->s_bdi = &v9ses->bdi; |
9e82cf6a8
|
87 88 |
sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | |
0d456fa42
|
89 |
MS_NOATIME; |
4b53e4b50
|
90 91 |
save_mount_options(sb, data); |
9e82cf6a8
|
92 93 94 95 96 97 98 99 |
} /** * v9fs_get_sb - mount a superblock * @fs_type: file system type * @flags: mount flags * @dev_name: device name that was mounted * @data: mount options |
454e2398b
|
100 |
* @mnt: mountpoint record to be instantiated |
9e82cf6a8
|
101 102 |
* */ |
454e2398b
|
103 104 105 |
static int v9fs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
9e82cf6a8
|
106 107 |
{ struct super_block *sb = NULL; |
9e82cf6a8
|
108 109 110 |
struct inode *inode = NULL; struct dentry *root = NULL; struct v9fs_session_info *v9ses = NULL; |
9e82cf6a8
|
111 |
int mode = S_IRWXUGO | S_ISVTX; |
bd238fb43
|
112 |
struct p9_fid *fid; |
9e82cf6a8
|
113 |
int retval = 0; |
bd238fb43
|
114 115 |
P9_DPRINTK(P9_DEBUG_VFS, " "); |
9e82cf6a8
|
116 |
|
1dac06b20
|
117 |
v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a8
|
118 |
if (!v9ses) |
454e2398b
|
119 |
return -ENOMEM; |
9e82cf6a8
|
120 |
|
bd238fb43
|
121 122 123 |
fid = v9fs_session_init(v9ses, dev_name, data); if (IS_ERR(fid)) { retval = PTR_ERR(fid); |
5c25f347a
|
124 125 126 127 |
/* * we need to call session_close to tear down some * of the data structure setup by session_init */ |
887b3ece6
|
128 |
goto close_session; |
bd238fb43
|
129 |
} |
9e82cf6a8
|
130 |
sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
454e2398b
|
131 132 |
if (IS_ERR(sb)) { retval = PTR_ERR(sb); |
f08531220
|
133 |
goto clunk_fid; |
454e2398b
|
134 |
} |
4b53e4b50
|
135 |
v9fs_fill_super(sb, v9ses, flags, data); |
9e82cf6a8
|
136 137 138 139 |
inode = v9fs_get_inode(sb, S_IFDIR | mode); if (IS_ERR(inode)) { retval = PTR_ERR(inode); |
887b3ece6
|
140 |
goto release_sb; |
9e82cf6a8
|
141 |
} |
9e82cf6a8
|
142 |
root = d_alloc_root(inode); |
9e82cf6a8
|
143 |
if (!root) { |
c96f58573
|
144 |
iput(inode); |
9e82cf6a8
|
145 |
retval = -ENOMEM; |
887b3ece6
|
146 |
goto release_sb; |
9e82cf6a8
|
147 |
} |
9e82cf6a8
|
148 |
sb->s_root = root; |
51a87c552
|
149 |
|
f08531220
|
150 151 152 153 154 |
if (v9fs_proto_dotl(v9ses)) { struct p9_stat_dotl *st = NULL; st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); if (IS_ERR(st)) { retval = PTR_ERR(st); |
5c25f347a
|
155 |
goto release_sb; |
f08531220
|
156 157 158 159 160 161 162 163 164 |
} v9fs_stat2inode_dotl(st, root->d_inode); kfree(st); } else { struct p9_wstat *st = NULL; st = p9_client_stat(fid); if (IS_ERR(st)) { retval = PTR_ERR(st); |
5c25f347a
|
165 |
goto release_sb; |
f08531220
|
166 167 168 169 170 171 172 173 |
} root->d_inode->i_ino = v9fs_qid2ino(&st->qid); v9fs_stat2inode(st, root->d_inode, sb); p9stat_free(st); kfree(st); } |
51a87c552
|
174 |
|
bd238fb43
|
175 |
v9fs_fid_add(root, fid); |
9e82cf6a8
|
176 |
|
5c25f347a
|
177 178 |
P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0 "); |
a3ec947c8
|
179 180 |
simple_set_mnt(mnt, sb); return 0; |
9e82cf6a8
|
181 |
|
887b3ece6
|
182 183 |
clunk_fid: p9_client_clunk(fid); |
887b3ece6
|
184 185 186 |
close_session: v9fs_session_close(v9ses); kfree(v9ses); |
1b5ab3e86
|
187 |
return retval; |
1b5ab3e86
|
188 |
release_sb: |
5c25f347a
|
189 190 191 192 193 194 195 |
/* * we will do the session_close and root dentry release * in the below call. But we need to clunk fid, because we haven't * attached the fid to dentry so it won't get clunked * automatically. */ p9_client_clunk(fid); |
1b5ab3e86
|
196 |
deactivate_locked_super(sb); |
454e2398b
|
197 |
return retval; |
9e82cf6a8
|
198 199 200 201 202 203 204 205 206 207 208 |
} /** * v9fs_kill_super - Kill Superblock * @s: superblock * */ static void v9fs_kill_super(struct super_block *s) { struct v9fs_session_info *v9ses = s->s_fs_info; |
bd238fb43
|
209 210 |
P9_DPRINTK(P9_DEBUG_VFS, " %p ", s); |
9e82cf6a8
|
211 |
|
083c73c25
|
212 213 |
if (s->s_root) v9fs_dentry_release(s->s_root); /* clunk root */ |
9e82cf6a8
|
214 215 |
kill_anon_super(s); |
6d96d3ab7
|
216 |
v9fs_session_cancel(v9ses); |
9e82cf6a8
|
217 218 |
v9fs_session_close(v9ses); kfree(v9ses); |
1b5ab3e86
|
219 |
s->s_fs_info = NULL; |
bd238fb43
|
220 221 |
P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super "); |
9e82cf6a8
|
222 |
} |
322b329ab
|
223 |
static void |
42faad996
|
224 |
v9fs_umount_begin(struct super_block *sb) |
322b329ab
|
225 |
{ |
67e55205e
|
226 |
struct v9fs_session_info *v9ses; |
322b329ab
|
227 |
|
67e55205e
|
228 |
v9ses = sb->s_fs_info; |
6d96d3ab7
|
229 |
v9fs_session_begin_cancel(v9ses); |
322b329ab
|
230 |
} |
bda8e7752
|
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 |
static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct v9fs_session_info *v9ses; struct p9_fid *fid; struct p9_rstatfs rs; int res; fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) { res = PTR_ERR(fid); goto done; } v9ses = v9fs_inode2v9ses(dentry->d_inode); if (v9fs_proto_dotl(v9ses)) { res = p9_client_statfs(fid, &rs); if (res == 0) { buf->f_type = rs.type; buf->f_bsize = rs.bsize; buf->f_blocks = rs.blocks; buf->f_bfree = rs.bfree; buf->f_bavail = rs.bavail; buf->f_files = rs.files; buf->f_ffree = rs.ffree; buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL; buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL; buf->f_namelen = rs.namelen; } if (res != -ENOSYS) goto done; } res = simple_statfs(dentry, buf); done: return res; } |
ee9b6d61a
|
266 |
static const struct super_operations v9fs_super_ops = { |
60e78d2c9
|
267 268 269 270 |
#ifdef CONFIG_9P_FSCACHE .alloc_inode = v9fs_alloc_inode, .destroy_inode = v9fs_destroy_inode, #endif |
9e82cf6a8
|
271 |
.statfs = simple_statfs, |
b57922d97
|
272 |
.evict_inode = v9fs_evict_inode, |
4b53e4b50
|
273 |
.show_options = generic_show_options, |
322b329ab
|
274 |
.umount_begin = v9fs_umount_begin, |
9e82cf6a8
|
275 |
}; |
9b6533c9b
|
276 277 278 279 280 |
static const struct super_operations v9fs_super_ops_dotl = { #ifdef CONFIG_9P_FSCACHE .alloc_inode = v9fs_alloc_inode, .destroy_inode = v9fs_destroy_inode, #endif |
bda8e7752
|
281 |
.statfs = v9fs_statfs, |
b57922d97
|
282 |
.evict_inode = v9fs_evict_inode, |
9b6533c9b
|
283 284 285 |
.show_options = generic_show_options, .umount_begin = v9fs_umount_begin, }; |
9e82cf6a8
|
286 |
struct file_system_type v9fs_fs_type = { |
67543e508
|
287 |
.name = "9p", |
9e82cf6a8
|
288 289 290 |
.get_sb = v9fs_get_sb, .kill_sb = v9fs_kill_super, .owner = THIS_MODULE, |
a534c8d15
|
291 |
.fs_flags = FS_RENAME_DOES_D_MOVE, |
9e82cf6a8
|
292 |
}; |