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