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> |
bd238fb4 LI |
41 | #include <net/9p/9p.h> |
42 | #include <net/9p/client.h> | |
9e82cf6a | 43 | |
9e82cf6a | 44 | #include "v9fs.h" |
9e82cf6a | 45 | #include "v9fs_vfs.h" |
9e82cf6a EVH |
46 | #include "fid.h" |
47 | ||
ee9b6d61 | 48 | static const struct super_operations v9fs_super_ops; |
9e82cf6a | 49 | |
9e82cf6a EVH |
50 | /** |
51 | * v9fs_set_super - set the superblock | |
52 | * @s: super block | |
53 | * @data: file system specific data | |
54 | * | |
55 | */ | |
56 | ||
57 | static int v9fs_set_super(struct super_block *s, void *data) | |
58 | { | |
59 | s->s_fs_info = data; | |
60 | return set_anon_super(s, data); | |
61 | } | |
62 | ||
63 | /** | |
64 | * v9fs_fill_super - populate superblock with info | |
65 | * @sb: superblock | |
66 | * @v9ses: session information | |
ee443996 | 67 | * @flags: flags propagated from v9fs_get_sb() |
9e82cf6a EVH |
68 | * |
69 | */ | |
70 | ||
71 | static void | |
72 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, | |
4b53e4b5 | 73 | int flags, void *data) |
9e82cf6a EVH |
74 | { |
75 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
76 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
77 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
78 | sb->s_magic = V9FS_MAGIC; | |
79 | sb->s_op = &v9fs_super_ops; | |
80 | ||
81 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
0d456fa4 | 82 | MS_NOATIME; |
4b53e4b5 AK |
83 | |
84 | save_mount_options(sb, data); | |
9e82cf6a EVH |
85 | } |
86 | ||
87 | /** | |
88 | * v9fs_get_sb - mount a superblock | |
89 | * @fs_type: file system type | |
90 | * @flags: mount flags | |
91 | * @dev_name: device name that was mounted | |
92 | * @data: mount options | |
454e2398 | 93 | * @mnt: mountpoint record to be instantiated |
9e82cf6a EVH |
94 | * |
95 | */ | |
96 | ||
454e2398 DH |
97 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
98 | const char *dev_name, void *data, | |
99 | struct vfsmount *mnt) | |
9e82cf6a EVH |
100 | { |
101 | struct super_block *sb = NULL; | |
9e82cf6a EVH |
102 | struct inode *inode = NULL; |
103 | struct dentry *root = NULL; | |
104 | struct v9fs_session_info *v9ses = NULL; | |
51a87c55 | 105 | struct p9_wstat *st = NULL; |
9e82cf6a | 106 | int mode = S_IRWXUGO | S_ISVTX; |
bd238fb4 | 107 | struct p9_fid *fid; |
9e82cf6a EVH |
108 | int retval = 0; |
109 | ||
bd238fb4 | 110 | P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
9e82cf6a | 111 | |
1dac06b2 | 112 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 113 | if (!v9ses) |
454e2398 | 114 | return -ENOMEM; |
9e82cf6a | 115 | |
bd238fb4 LI |
116 | fid = v9fs_session_init(v9ses, dev_name, data); |
117 | if (IS_ERR(fid)) { | |
118 | retval = PTR_ERR(fid); | |
887b3ece | 119 | goto close_session; |
bd238fb4 LI |
120 | } |
121 | ||
122 | st = p9_client_stat(fid); | |
123 | if (IS_ERR(st)) { | |
124 | retval = PTR_ERR(st); | |
887b3ece | 125 | goto clunk_fid; |
9e82cf6a EVH |
126 | } |
127 | ||
128 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); | |
454e2398 DH |
129 | if (IS_ERR(sb)) { |
130 | retval = PTR_ERR(sb); | |
887b3ece | 131 | goto free_stat; |
454e2398 | 132 | } |
4b53e4b5 | 133 | v9fs_fill_super(sb, v9ses, flags, data); |
9e82cf6a EVH |
134 | |
135 | inode = v9fs_get_inode(sb, S_IFDIR | mode); | |
136 | if (IS_ERR(inode)) { | |
137 | retval = PTR_ERR(inode); | |
887b3ece | 138 | goto release_sb; |
9e82cf6a EVH |
139 | } |
140 | ||
9e82cf6a | 141 | root = d_alloc_root(inode); |
9e82cf6a | 142 | if (!root) { |
c96f5857 | 143 | iput(inode); |
9e82cf6a | 144 | retval = -ENOMEM; |
887b3ece | 145 | goto release_sb; |
9e82cf6a EVH |
146 | } |
147 | ||
148 | sb->s_root = root; | |
bd238fb4 | 149 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); |
51a87c55 | 150 | |
bd238fb4 | 151 | v9fs_stat2inode(st, root->d_inode, sb); |
51a87c55 | 152 | |
bd238fb4 | 153 | v9fs_fid_add(root, fid); |
51a87c55 | 154 | p9stat_free(st); |
dda6b022 | 155 | kfree(st); |
9e82cf6a | 156 | |
a3ec947c SB |
157 | P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
158 | simple_set_mnt(mnt, sb); | |
159 | return 0; | |
9e82cf6a | 160 | |
887b3ece | 161 | free_stat: |
1b5ab3e8 | 162 | p9stat_free(st); |
887b3ece EVH |
163 | kfree(st); |
164 | ||
165 | clunk_fid: | |
166 | p9_client_clunk(fid); | |
167 | ||
168 | close_session: | |
169 | v9fs_session_close(v9ses); | |
170 | kfree(v9ses); | |
1b5ab3e8 | 171 | return retval; |
887b3ece | 172 | |
1b5ab3e8 AK |
173 | release_sb: |
174 | p9stat_free(st); | |
175 | kfree(st); | |
176 | deactivate_locked_super(sb); | |
454e2398 | 177 | return retval; |
9e82cf6a EVH |
178 | } |
179 | ||
180 | /** | |
181 | * v9fs_kill_super - Kill Superblock | |
182 | * @s: superblock | |
183 | * | |
184 | */ | |
185 | ||
186 | static void v9fs_kill_super(struct super_block *s) | |
187 | { | |
188 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
189 | ||
bd238fb4 | 190 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a | 191 | |
083c73c2 AV |
192 | if (s->s_root) |
193 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
9e82cf6a EVH |
194 | |
195 | kill_anon_super(s); | |
196 | ||
6d96d3ab | 197 | v9fs_session_cancel(v9ses); |
9e82cf6a EVH |
198 | v9fs_session_close(v9ses); |
199 | kfree(v9ses); | |
1b5ab3e8 | 200 | s->s_fs_info = NULL; |
bd238fb4 | 201 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
202 | } |
203 | ||
322b329a | 204 | static void |
42faad99 | 205 | v9fs_umount_begin(struct super_block *sb) |
322b329a | 206 | { |
67e55205 | 207 | struct v9fs_session_info *v9ses; |
322b329a | 208 | |
67e55205 | 209 | v9ses = sb->s_fs_info; |
6d96d3ab | 210 | v9fs_session_begin_cancel(v9ses); |
322b329a EVH |
211 | } |
212 | ||
ee9b6d61 | 213 | static const struct super_operations v9fs_super_ops = { |
60e78d2c AK |
214 | #ifdef CONFIG_9P_FSCACHE |
215 | .alloc_inode = v9fs_alloc_inode, | |
216 | .destroy_inode = v9fs_destroy_inode, | |
217 | #endif | |
9e82cf6a EVH |
218 | .statfs = simple_statfs, |
219 | .clear_inode = v9fs_clear_inode, | |
4b53e4b5 | 220 | .show_options = generic_show_options, |
322b329a | 221 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
222 | }; |
223 | ||
224 | struct file_system_type v9fs_fs_type = { | |
67543e50 | 225 | .name = "9p", |
9e82cf6a EVH |
226 | .get_sb = v9fs_get_sb, |
227 | .kill_sb = v9fs_kill_super, | |
228 | .owner = THIS_MODULE, | |
229 | }; |