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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 | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/config.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/fs.h> | |
33 | #include <linux/file.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/string.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/pagemap.h> | |
39 | #include <linux/seq_file.h> | |
40 | #include <linux/mount.h> | |
41 | #include <linux/idr.h> | |
42 | ||
43 | #include "debug.h" | |
44 | #include "v9fs.h" | |
45 | #include "9p.h" | |
46 | #include "v9fs_vfs.h" | |
47 | #include "conv.h" | |
48 | #include "fid.h" | |
49 | ||
50 | static void v9fs_clear_inode(struct inode *); | |
51 | static struct super_operations v9fs_super_ops; | |
52 | ||
53 | /** | |
54 | * v9fs_clear_inode - release an inode | |
55 | * @inode: inode to release | |
56 | * | |
57 | */ | |
58 | ||
59 | static void v9fs_clear_inode(struct inode *inode) | |
60 | { | |
61 | filemap_fdatawrite(inode->i_mapping); | |
62 | } | |
63 | ||
64 | /** | |
65 | * v9fs_set_super - set the superblock | |
66 | * @s: super block | |
67 | * @data: file system specific data | |
68 | * | |
69 | */ | |
70 | ||
71 | static int v9fs_set_super(struct super_block *s, void *data) | |
72 | { | |
73 | s->s_fs_info = data; | |
74 | return set_anon_super(s, data); | |
75 | } | |
76 | ||
77 | /** | |
78 | * v9fs_fill_super - populate superblock with info | |
79 | * @sb: superblock | |
80 | * @v9ses: session information | |
81 | * | |
82 | */ | |
83 | ||
84 | static void | |
85 | v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, | |
86 | int flags) | |
87 | { | |
88 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
89 | sb->s_blocksize_bits = fls(v9ses->maxdata - 1); | |
90 | sb->s_blocksize = 1 << sb->s_blocksize_bits; | |
91 | sb->s_magic = V9FS_MAGIC; | |
92 | sb->s_op = &v9fs_super_ops; | |
93 | ||
94 | sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | | |
95 | MS_NODIRATIME | MS_NOATIME; | |
96 | } | |
97 | ||
98 | /** | |
99 | * v9fs_get_sb - mount a superblock | |
100 | * @fs_type: file system type | |
101 | * @flags: mount flags | |
102 | * @dev_name: device name that was mounted | |
103 | * @data: mount options | |
104 | * | |
105 | */ | |
106 | ||
107 | static struct super_block *v9fs_get_sb(struct file_system_type | |
108 | *fs_type, int flags, | |
109 | const char *dev_name, void *data) | |
110 | { | |
111 | struct super_block *sb = NULL; | |
112 | struct v9fs_fcall *fcall = NULL; | |
113 | struct inode *inode = NULL; | |
114 | struct dentry *root = NULL; | |
115 | struct v9fs_session_info *v9ses = NULL; | |
116 | struct v9fs_fid *root_fid = NULL; | |
117 | int mode = S_IRWXUGO | S_ISVTX; | |
118 | uid_t uid = current->fsuid; | |
119 | gid_t gid = current->fsgid; | |
120 | int stat_result = 0; | |
121 | int newfid = 0; | |
122 | int retval = 0; | |
123 | ||
124 | dprintk(DEBUG_VFS, " \n"); | |
125 | ||
126 | v9ses = kcalloc(1, sizeof(struct v9fs_session_info), GFP_KERNEL); | |
127 | if (!v9ses) | |
128 | return ERR_PTR(-ENOMEM); | |
129 | ||
130 | if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) { | |
131 | dprintk(DEBUG_ERROR, "problem initiating session\n"); | |
3cf6429a | 132 | kfree(v9ses); |
192eaa28 | 133 | return ERR_PTR(newfid); |
9e82cf6a EVH |
134 | } |
135 | ||
136 | sb = sget(fs_type, NULL, v9fs_set_super, v9ses); | |
137 | ||
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); | |
150 | ||
151 | if (!root) { | |
152 | retval = -ENOMEM; | |
f71626a4 | 153 | goto put_back_sb; |
9e82cf6a EVH |
154 | } |
155 | ||
156 | sb->s_root = root; | |
157 | ||
9e82cf6a EVH |
158 | stat_result = v9fs_t_stat(v9ses, newfid, &fcall); |
159 | if (stat_result < 0) { | |
160 | dprintk(DEBUG_ERROR, "stat error\n"); | |
3cf6429a | 161 | v9fs_t_clunk(v9ses, newfid); |
9e82cf6a EVH |
162 | v9fs_put_idpool(newfid, &v9ses->fidpool); |
163 | } else { | |
0b8dd177 LI |
164 | /* Setup the Root Inode */ |
165 | root_fid = v9fs_fid_create(root, v9ses, newfid, 0); | |
166 | if (root_fid == NULL) { | |
167 | retval = -ENOMEM; | |
168 | goto put_back_sb; | |
169 | } | |
170 | ||
9e82cf6a EVH |
171 | root_fid->qid = fcall->params.rstat.stat->qid; |
172 | root->d_inode->i_ino = | |
173 | v9fs_qid2ino(&fcall->params.rstat.stat->qid); | |
174 | v9fs_mistat2inode(fcall->params.rstat.stat, root->d_inode, sb); | |
175 | } | |
176 | ||
177 | kfree(fcall); | |
178 | ||
179 | if (stat_result < 0) { | |
180 | retval = stat_result; | |
f71626a4 | 181 | goto put_back_sb; |
9e82cf6a EVH |
182 | } |
183 | ||
184 | return sb; | |
185 | ||
f71626a4 LI |
186 | put_back_sb: |
187 | /* deactivate_super calls v9fs_kill_super which will frees the rest */ | |
9e82cf6a EVH |
188 | up_write(&sb->s_umount); |
189 | deactivate_super(sb); | |
9e82cf6a EVH |
190 | return ERR_PTR(retval); |
191 | } | |
192 | ||
193 | /** | |
194 | * v9fs_kill_super - Kill Superblock | |
195 | * @s: superblock | |
196 | * | |
197 | */ | |
198 | ||
199 | static void v9fs_kill_super(struct super_block *s) | |
200 | { | |
201 | struct v9fs_session_info *v9ses = s->s_fs_info; | |
202 | ||
203 | dprintk(DEBUG_VFS, " %p\n", s); | |
204 | ||
205 | v9fs_dentry_release(s->s_root); /* clunk root */ | |
206 | ||
207 | kill_anon_super(s); | |
208 | ||
209 | v9fs_session_close(v9ses); | |
210 | kfree(v9ses); | |
211 | dprintk(DEBUG_VFS, "exiting kill_super\n"); | |
212 | } | |
213 | ||
214 | /** | |
215 | * v9fs_show_options - Show mount options in /proc/mounts | |
216 | * @m: seq_file to write to | |
217 | * @mnt: mount descriptor | |
218 | * | |
219 | */ | |
220 | ||
221 | static int v9fs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
222 | { | |
223 | struct v9fs_session_info *v9ses = mnt->mnt_sb->s_fs_info; | |
224 | ||
225 | if (v9ses->debug != 0) | |
226 | seq_printf(m, ",debug=%u", v9ses->debug); | |
227 | if (v9ses->port != V9FS_PORT) | |
228 | seq_printf(m, ",port=%u", v9ses->port); | |
229 | if (v9ses->maxdata != 9000) | |
230 | seq_printf(m, ",msize=%u", v9ses->maxdata); | |
231 | if (v9ses->afid != ~0) | |
232 | seq_printf(m, ",afid=%u", v9ses->afid); | |
233 | if (v9ses->proto == PROTO_UNIX) | |
234 | seq_puts(m, ",proto=unix"); | |
235 | if (v9ses->extended == 0) | |
236 | seq_puts(m, ",noextend"); | |
237 | if (v9ses->nodev == 1) | |
238 | seq_puts(m, ",nodevmap"); | |
239 | seq_printf(m, ",name=%s", v9ses->name); | |
240 | seq_printf(m, ",aname=%s", v9ses->remotename); | |
241 | seq_printf(m, ",uid=%u", v9ses->uid); | |
242 | seq_printf(m, ",gid=%u", v9ses->gid); | |
243 | return 0; | |
244 | } | |
245 | ||
322b329a EVH |
246 | static void |
247 | v9fs_umount_begin(struct super_block *sb) | |
248 | { | |
249 | struct v9fs_session_info *v9ses = sb->s_fs_info; | |
250 | ||
251 | v9fs_session_cancel(v9ses); | |
252 | } | |
253 | ||
9e82cf6a EVH |
254 | static struct super_operations v9fs_super_ops = { |
255 | .statfs = simple_statfs, | |
256 | .clear_inode = v9fs_clear_inode, | |
257 | .show_options = v9fs_show_options, | |
322b329a | 258 | .umount_begin = v9fs_umount_begin, |
9e82cf6a EVH |
259 | }; |
260 | ||
261 | struct file_system_type v9fs_fs_type = { | |
262 | .name = "9P", | |
263 | .get_sb = v9fs_get_sb, | |
264 | .kill_sb = v9fs_kill_super, | |
265 | .owner = THIS_MODULE, | |
266 | }; |