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> | |
39 | ||
40 | #include "debug.h" | |
41 | #include "v9fs.h" | |
42 | #include "9p.h" | |
43 | #include "v9fs_vfs.h" | |
9e82cf6a EVH |
44 | #include "fid.h" |
45 | ||
46 | static void v9fs_clear_inode(struct inode *); | |
ee9b6d61 | 47 | static const struct super_operations v9fs_super_ops; |
9e82cf6a EVH |
48 | |
49 | /** | |
50 | * v9fs_clear_inode - release an inode | |
51 | * @inode: inode to release | |
52 | * | |
53 | */ | |
54 | ||
55 | static void v9fs_clear_inode(struct inode *inode) | |
56 | { | |
57 | filemap_fdatawrite(inode->i_mapping); | |
58 | } | |
59 | ||
60 | /** | |
61 | * v9fs_set_super - set the superblock | |
62 | * @s: super block | |
63 | * @data: file system specific data | |
64 | * | |
65 | */ | |
66 | ||
67 | static int v9fs_set_super(struct super_block *s, void *data) | |
68 | { | |
69 | s->s_fs_info = data; | |
70 | return set_anon_super(s, data); | |
71 | } | |
72 | ||
73 | /** | |
74 | * v9fs_fill_super - populate superblock with info | |
75 | * @sb: superblock | |
76 | * @v9ses: session information | |
77 | * | |
78 | */ | |
79 | ||
80 | static void | |
81 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, | |
82 | int flags) | |
83 | { | |
84 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
85 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
86 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
87 | sb->s_magic = V9FS_MAGIC; | |
88 | sb->s_op = &v9fs_super_ops; | |
89 | ||
90 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
0d456fa4 | 91 | MS_NOATIME; |
9e82cf6a EVH |
92 | } |
93 | ||
94 | /** | |
95 | * v9fs_get_sb - mount a superblock | |
96 | * @fs_type: file system type | |
97 | * @flags: mount flags | |
98 | * @dev_name: device name that was mounted | |
99 | * @data: mount options | |
454e2398 | 100 | * @mnt: mountpoint record to be instantiated |
9e82cf6a EVH |
101 | * |
102 | */ | |
103 | ||
454e2398 DH |
104 | static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
105 | const char *dev_name, void *data, | |
106 | struct vfsmount *mnt) | |
9e82cf6a EVH |
107 | { |
108 | struct super_block *sb = NULL; | |
109 | struct v9fs_fcall *fcall = NULL; | |
110 | struct inode *inode = NULL; | |
111 | struct dentry *root = NULL; | |
112 | struct v9fs_session_info *v9ses = NULL; | |
113 | struct v9fs_fid *root_fid = NULL; | |
114 | int mode = S_IRWXUGO | S_ISVTX; | |
115 | uid_t uid = current->fsuid; | |
116 | gid_t gid = current->fsgid; | |
117 | int stat_result = 0; | |
118 | int newfid = 0; | |
119 | int retval = 0; | |
120 | ||
121 | dprintk(DEBUG_VFS, " \n"); | |
122 | ||
1dac06b2 | 123 | v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
9e82cf6a | 124 | if (!v9ses) |
454e2398 | 125 | return -ENOMEM; |
9e82cf6a EVH |
126 | |
127 | if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) { | |
128 | dprintk(DEBUG_ERROR, "problem initiating session\n"); | |
454e2398 | 129 | retval = newfid; |
00fbc6df | 130 | goto out_free_session; |
9e82cf6a EVH |
131 | } |
132 | ||
133 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); | |
454e2398 DH |
134 | if (IS_ERR(sb)) { |
135 | retval = PTR_ERR(sb); | |
00fbc6df | 136 | goto out_close_session; |
454e2398 | 137 | } |
9e82cf6a EVH |
138 | v9fs_fill_super(sb, v9ses, flags); |
139 | ||
140 | inode = v9fs_get_inode(sb, S_IFDIR | mode); | |
141 | if (IS_ERR(inode)) { | |
142 | retval = PTR_ERR(inode); | |
143 | goto put_back_sb; | |
144 | } | |
145 | ||
146 | inode->i_uid = uid; | |
147 | inode->i_gid = gid; | |
148 | ||
149 | root = d_alloc_root(inode); | |
9e82cf6a EVH |
150 | if (!root) { |
151 | retval = -ENOMEM; | |
f71626a4 | 152 | goto put_back_sb; |
9e82cf6a EVH |
153 | } |
154 | ||
155 | sb->s_root = root; | |
156 | ||
9e82cf6a EVH |
157 | stat_result = v9fs_t_stat(v9ses, newfid, &fcall); |
158 | if (stat_result < 0) { | |
159 | dprintk(DEBUG_ERROR, "stat error\n"); | |
3cf6429a | 160 | v9fs_t_clunk(v9ses, newfid); |
9e82cf6a | 161 | } else { |
0b8dd177 | 162 | /* Setup the Root Inode */ |
6a3124a3 | 163 | root_fid = v9fs_fid_create(v9ses, newfid); |
0b8dd177 LI |
164 | if (root_fid == NULL) { |
165 | retval = -ENOMEM; | |
166 | goto put_back_sb; | |
167 | } | |
168 | ||
6a3124a3 | 169 | retval = v9fs_fid_insert(root_fid, root); |
74b8054c EVH |
170 | if (retval < 0) { |
171 | kfree(fcall); | |
6a3124a3 | 172 | goto put_back_sb; |
74b8054c | 173 | } |
6a3124a3 | 174 | |
531b1094 | 175 | root_fid->qid = fcall->params.rstat.stat.qid; |
9e82cf6a | 176 | root->d_inode->i_ino = |
531b1094 LI |
177 | v9fs_qid2ino(&fcall->params.rstat.stat.qid); |
178 | v9fs_stat2inode(&fcall->params.rstat.stat, root->d_inode, sb); | |
9e82cf6a EVH |
179 | } |
180 | ||
74b8054c EVH |
181 | kfree(fcall); |
182 | ||
9e82cf6a EVH |
183 | if (stat_result < 0) { |
184 | retval = stat_result; | |
f71626a4 | 185 | goto put_back_sb; |
9e82cf6a EVH |
186 | } |
187 | ||
454e2398 | 188 | return simple_set_mnt(mnt, sb); |
9e82cf6a | 189 | |
00fbc6df EVH |
190 | out_close_session: |
191 | v9fs_session_close(v9ses); | |
192 | out_free_session: | |
193 | kfree(v9ses); | |
454e2398 | 194 | return retval; |
00fbc6df | 195 | |
f71626a4 LI |
196 | put_back_sb: |
197 | /* deactivate_super calls v9fs_kill_super which will frees the rest */ | |
9e82cf6a EVH |
198 | up_write(&sb->s_umount); |
199 | deactivate_super(sb); | |
454e2398 | 200 | return retval; |
9e82cf6a EVH |
201 | } |
202 | ||
203 | /** | |
204 | * v9fs_kill_super - Kill Superblock | |
205 | * @s: superblock | |
206 | * | |
207 | */ | |
208 | ||
209 | static void v9fs_kill_super(struct super_block *s) | |
210 | { | |
211 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
212 | ||
213 | dprintk(DEBUG_VFS, " %p\n", s); | |
214 | ||
215 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
216 | ||
217 | kill_anon_super(s); | |
218 | ||
219 | v9fs_session_close(v9ses); | |
220 | kfree(v9ses); | |
221 | dprintk(DEBUG_VFS, "exiting kill_super\n"); | |
222 | } | |
223 | ||
224 | /** | |
225 | * v9fs_show_options - Show mount options in /proc/mounts | |
226 | * @m: seq_file to write to | |
227 | * @mnt: mount descriptor | |
228 | * | |
229 | */ | |
230 | ||
231 | static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
232 | { | |
233 | struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; | |
234 | ||
235 | if (v9ses->debug != 0) | |
236 | seq_printf(m, ",debug=%u", v9ses->debug); | |
237 | if (v9ses->port != V9FS_PORT) | |
238 | seq_printf(m, ",port=%u", v9ses->port); | |
239 | if (v9ses->maxdata != 9000) | |
240 | seq_printf(m, ",msize=%u", v9ses->maxdata); | |
241 | if (v9ses->afid != ~0) | |
242 | seq_printf(m, ",afid=%u", v9ses->afid); | |
243 | if (v9ses->proto == PROTO_UNIX) | |
244 | seq_puts(m, ",proto=unix"); | |
245 | if (v9ses->extended == 0) | |
246 | seq_puts(m, ",noextend"); | |
247 | if (v9ses->nodev == 1) | |
248 | seq_puts(m, ",nodevmap"); | |
249 | seq_printf(m, ",name=%s", v9ses->name); | |
250 | seq_printf(m, ",aname=%s", v9ses->remotename); | |
251 | seq_printf(m, ",uid=%u", v9ses->uid); | |
252 | seq_printf(m, ",gid=%u", v9ses->gid); | |
253 | return 0; | |
254 | } | |
255 | ||
322b329a | 256 | static void |
8b512d9a | 257 | v9fs_umount_begin(struct vfsmount *vfsmnt, int flags) |
322b329a | 258 | { |
8b512d9a | 259 | struct v9fs_session_info *v9ses = vfsmnt->mnt_sb->s_fs_info; |
322b329a | 260 | |
8b512d9a TM |
261 | if (flags & MNT_FORCE) |
262 | v9fs_session_cancel(v9ses); | |
322b329a EVH |
263 | } |
264 | ||
ee9b6d61 | 265 | static const struct super_operations v9fs_super_ops = { |
9e82cf6a EVH |
266 | .statfs = simple_statfs, |
267 | .clear_inode = v9fs_clear_inode, | |
268 | .show_options = v9fs_show_options, | |
322b329a | 269 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
270 | }; |
271 | ||
272 | struct file_system_type v9fs_fs_type = { | |
67543e50 | 273 | .name = "9p", |
9e82cf6a EVH |
274 | .get_sb = v9fs_get_sb, |
275 | .kill_sb = v9fs_kill_super, | |
276 | .owner = THIS_MODULE, | |
277 | }; |