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> |
bd238fb4 LI |
40 | #include <net/9p/9p.h> |
41 | #include <net/9p/client.h> | |
9e82cf6a | 42 | |
9e82cf6a | 43 | #include "v9fs.h" |
9e82cf6a | 44 | #include "v9fs_vfs.h" |
9e82cf6a EVH |
45 | #include "fid.h" |
46 | ||
47 | static void v9fs_clear_inode(struct inode *); | |
ee9b6d61 | 48 | static const struct super_operations v9fs_super_ops; |
9e82cf6a EVH |
49 | |
50 | /** | |
51 | * v9fs_clear_inode - release an inode | |
52 | * @inode: inode to release | |
53 | * | |
54 | */ | |
55 | ||
56 | static void v9fs_clear_inode(struct inode *inode) | |
57 | { | |
58 | filemap_fdatawrite(inode->i_mapping); | |
59 | } | |
60 | ||
61 | /** | |
62 | * v9fs_set_super - set the superblock | |
63 | * @s: super block | |
64 | * @data: file system specific data | |
65 | * | |
66 | */ | |
67 | ||
68 | static int v9fs_set_super(struct super_block *s, void *data) | |
69 | { | |
70 | s->s_fs_info = data; | |
71 | return set_anon_super(s, data); | |
72 | } | |
73 | ||
74 | /** | |
75 | * v9fs_fill_super - populate superblock with info | |
76 | * @sb: superblock | |
77 | * @v9ses: session information | |
78 | * | |
79 | */ | |
80 | ||
81 | static void | |
82 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, | |
83 | int flags) | |
84 | { | |
85 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
86 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
87 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
88 | sb->s_magic = V9FS_MAGIC; | |
89 | sb->s_op = &v9fs_super_ops; | |
90 | ||
91 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
0d456fa4 | 92 | MS_NOATIME; |
9e82cf6a EVH |
93 | } |
94 | ||
95 | /** | |
96 | * v9fs_get_sb - mount a superblock | |
97 | * @fs_type: file system type | |
98 | * @flags: mount flags | |
99 | * @dev_name: device name that was mounted | |
100 | * @data: mount options | |
454e2398 | 101 | * @mnt: mountpoint record to be instantiated |
9e82cf6a EVH |
102 | * |
103 | */ | |
104 | ||
454e2398 DH |
105 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
106 | const char *dev_name, void *data, | |
107 | struct vfsmount *mnt) | |
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; | |
bd238fb4 | 113 | struct p9_stat *st = NULL; |
9e82cf6a EVH |
114 | int mode = S_IRWXUGO | S_ISVTX; |
115 | uid_t uid = current->fsuid; | |
116 | gid_t gid = current->fsgid; | |
bd238fb4 | 117 | struct p9_fid *fid; |
9e82cf6a EVH |
118 | int retval = 0; |
119 | ||
bd238fb4 | 120 | P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
9e82cf6a | 121 | |
1dac06b2 | 122 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 123 | if (!v9ses) |
454e2398 | 124 | return -ENOMEM; |
9e82cf6a | 125 | |
bd238fb4 LI |
126 | fid = v9fs_session_init(v9ses, dev_name, data); |
127 | if (IS_ERR(fid)) { | |
128 | retval = PTR_ERR(fid); | |
129 | fid = NULL; | |
130 | kfree(v9ses); | |
131 | v9ses = NULL; | |
132 | goto error; | |
133 | } | |
134 | ||
135 | st = p9_client_stat(fid); | |
136 | if (IS_ERR(st)) { | |
137 | retval = PTR_ERR(st); | |
138 | goto error; | |
9e82cf6a EVH |
139 | } |
140 | ||
141 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); | |
454e2398 DH |
142 | if (IS_ERR(sb)) { |
143 | retval = PTR_ERR(sb); | |
bd238fb4 | 144 | goto error; |
454e2398 | 145 | } |
9e82cf6a EVH |
146 | v9fs_fill_super(sb, v9ses, flags); |
147 | ||
148 | inode = v9fs_get_inode(sb, S_IFDIR | mode); | |
149 | if (IS_ERR(inode)) { | |
150 | retval = PTR_ERR(inode); | |
bd238fb4 | 151 | goto error; |
9e82cf6a EVH |
152 | } |
153 | ||
154 | inode->i_uid = uid; | |
155 | inode->i_gid = gid; | |
156 | ||
157 | root = d_alloc_root(inode); | |
9e82cf6a EVH |
158 | if (!root) { |
159 | retval = -ENOMEM; | |
bd238fb4 | 160 | goto error; |
9e82cf6a EVH |
161 | } |
162 | ||
163 | sb->s_root = root; | |
bd238fb4 LI |
164 | root->d_inode->i_ino = v9fs_qid2ino(&st->qid); |
165 | v9fs_stat2inode(st, root->d_inode, sb); | |
166 | v9fs_fid_add(root, fid); | |
9e82cf6a | 167 | |
bd238fb4 | 168 | return simple_set_mnt(mnt, sb); |
9e82cf6a | 169 | |
bd238fb4 LI |
170 | error: |
171 | if (fid) | |
172 | p9_client_clunk(fid); | |
74b8054c | 173 | |
bd238fb4 LI |
174 | if (v9ses) { |
175 | v9fs_session_close(v9ses); | |
176 | kfree(v9ses); | |
9e82cf6a EVH |
177 | } |
178 | ||
bd238fb4 LI |
179 | if (sb) { |
180 | up_write(&sb->s_umount); | |
181 | deactivate_super(sb); | |
182 | } | |
00fbc6df | 183 | |
454e2398 | 184 | return retval; |
9e82cf6a EVH |
185 | } |
186 | ||
187 | /** | |
188 | * v9fs_kill_super - Kill Superblock | |
189 | * @s: superblock | |
190 | * | |
191 | */ | |
192 | ||
193 | static void v9fs_kill_super(struct super_block *s) | |
194 | { | |
195 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
196 | ||
bd238fb4 | 197 | P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
9e82cf6a EVH |
198 | |
199 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
200 | ||
201 | kill_anon_super(s); | |
202 | ||
203 | v9fs_session_close(v9ses); | |
204 | kfree(v9ses); | |
bd238fb4 | 205 | P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
9e82cf6a EVH |
206 | } |
207 | ||
208 | /** | |
209 | * v9fs_show_options - Show mount options in /proc/mounts | |
210 | * @m: seq_file to write to | |
211 | * @mnt: mount descriptor | |
212 | * | |
213 | */ | |
214 | ||
215 | static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
216 | { | |
217 | struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; | |
218 | ||
a80d923e | 219 | seq_printf(m, "%s", v9ses->options); |
9e82cf6a EVH |
220 | return 0; |
221 | } | |
222 | ||
322b329a | 223 | static void |
8b512d9a | 224 | v9fs_umount_begin(struct vfsmount *vfsmnt, int flags) |
322b329a | 225 | { |
8b512d9a | 226 | struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info; |
322b329a | 227 | |
8b512d9a TM |
228 | if (flags & MNT_FORCE) |
229 | v9fs_session_cancel(v9ses); | |
322b329a EVH |
230 | } |
231 | ||
ee9b6d61 | 232 | static const struct super_operations v9fs_super_ops = { |
9e82cf6a EVH |
233 | .statfs = simple_statfs, |
234 | .clear_inode = v9fs_clear_inode, | |
235 | .show_options = v9fs_show_options, | |
322b329a | 236 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
237 | }; |
238 | ||
239 | struct file_system_type v9fs_fs_type = { | |
67543e50 | 240 | .name = "9p", |
9e82cf6a EVH |
241 | .get_sb = v9fs_get_sb, |
242 | .kill_sb = v9fs_kill_super, | |
243 | .owner = THIS_MODULE, | |
244 | }; |