[SCSI] scsi_debug: Convert to use root_device_register() and root_device_unregister()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / 9p / vfs_super.c
blobf9311077de6842091df9f257e3e6d91c641a0622
1 /*
2 * linux/fs/9p/vfs_super.c
4 * This file contians superblock ops for 9P2000. It is intended that
5 * you mount this file system on directories.
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
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.
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
27 #include <linux/kernel.h>
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>
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 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/statfs.h>
42 #include <net/9p/9p.h>
43 #include <net/9p/client.h>
45 #include "v9fs.h"
46 #include "v9fs_vfs.h"
47 #include "fid.h"
48 #include "xattr.h"
50 static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
52 /**
53 * v9fs_set_super - set the superblock
54 * @s: super block
55 * @data: file system specific data
59 static int v9fs_set_super(struct super_block *s, void *data)
61 s->s_fs_info = data;
62 return set_anon_super(s, data);
65 /**
66 * v9fs_fill_super - populate superblock with info
67 * @sb: superblock
68 * @v9ses: session information
69 * @flags: flags propagated from v9fs_get_sb()
73 static void
74 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
75 int flags, void *data)
77 sb->s_maxbytes = MAX_LFS_FILESIZE;
78 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
79 sb->s_blocksize = 1 << sb->s_blocksize_bits;
80 sb->s_magic = V9FS_MAGIC;
81 if (v9fs_proto_dotl(v9ses)) {
82 sb->s_op = &v9fs_super_ops_dotl;
83 sb->s_xattr = v9fs_xattr_handlers;
84 } else
85 sb->s_op = &v9fs_super_ops;
86 sb->s_bdi = &v9ses->bdi;
88 sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
89 MS_NOATIME;
91 save_mount_options(sb, data);
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
100 * @mnt: mountpoint record to be instantiated
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)
108 struct super_block *sb = NULL;
109 struct inode *inode = NULL;
110 struct dentry *root = NULL;
111 struct v9fs_session_info *v9ses = NULL;
112 int mode = S_IRWXUGO | S_ISVTX;
113 struct p9_fid *fid;
114 int retval = 0;
116 P9_DPRINTK(P9_DEBUG_VFS, " \n");
118 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
119 if (!v9ses)
120 return -ENOMEM;
122 fid = v9fs_session_init(v9ses, dev_name, data);
123 if (IS_ERR(fid)) {
124 retval = PTR_ERR(fid);
125 goto close_session;
128 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
129 if (IS_ERR(sb)) {
130 retval = PTR_ERR(sb);
131 goto clunk_fid;
133 v9fs_fill_super(sb, v9ses, flags, data);
135 inode = v9fs_get_inode(sb, S_IFDIR | mode);
136 if (IS_ERR(inode)) {
137 retval = PTR_ERR(inode);
138 goto release_sb;
141 root = d_alloc_root(inode);
142 if (!root) {
143 iput(inode);
144 retval = -ENOMEM;
145 goto release_sb;
148 sb->s_root = root;
150 if (v9fs_proto_dotl(v9ses)) {
151 struct p9_stat_dotl *st = NULL;
152 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
153 if (IS_ERR(st)) {
154 retval = PTR_ERR(st);
155 goto clunk_fid;
158 v9fs_stat2inode_dotl(st, root->d_inode);
159 kfree(st);
160 } else {
161 struct p9_wstat *st = NULL;
162 st = p9_client_stat(fid);
163 if (IS_ERR(st)) {
164 retval = PTR_ERR(st);
165 goto clunk_fid;
168 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
169 v9fs_stat2inode(st, root->d_inode, sb);
171 p9stat_free(st);
172 kfree(st);
175 v9fs_fid_add(root, fid);
177 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
178 simple_set_mnt(mnt, sb);
179 return 0;
181 clunk_fid:
182 p9_client_clunk(fid);
184 close_session:
185 v9fs_session_close(v9ses);
186 kfree(v9ses);
187 return retval;
189 release_sb:
190 deactivate_locked_super(sb);
191 return retval;
195 * v9fs_kill_super - Kill Superblock
196 * @s: superblock
200 static void v9fs_kill_super(struct super_block *s)
202 struct v9fs_session_info *v9ses = s->s_fs_info;
204 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
206 if (s->s_root)
207 v9fs_dentry_release(s->s_root); /* clunk root */
209 kill_anon_super(s);
211 v9fs_session_cancel(v9ses);
212 v9fs_session_close(v9ses);
213 kfree(v9ses);
214 s->s_fs_info = NULL;
215 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
218 static void
219 v9fs_umount_begin(struct super_block *sb)
221 struct v9fs_session_info *v9ses;
223 v9ses = sb->s_fs_info;
224 v9fs_session_begin_cancel(v9ses);
227 static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
229 struct v9fs_session_info *v9ses;
230 struct p9_fid *fid;
231 struct p9_rstatfs rs;
232 int res;
234 fid = v9fs_fid_lookup(dentry);
235 if (IS_ERR(fid)) {
236 res = PTR_ERR(fid);
237 goto done;
240 v9ses = v9fs_inode2v9ses(dentry->d_inode);
241 if (v9fs_proto_dotl(v9ses)) {
242 res = p9_client_statfs(fid, &rs);
243 if (res == 0) {
244 buf->f_type = rs.type;
245 buf->f_bsize = rs.bsize;
246 buf->f_blocks = rs.blocks;
247 buf->f_bfree = rs.bfree;
248 buf->f_bavail = rs.bavail;
249 buf->f_files = rs.files;
250 buf->f_ffree = rs.ffree;
251 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
252 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
253 buf->f_namelen = rs.namelen;
255 if (res != -ENOSYS)
256 goto done;
258 res = simple_statfs(dentry, buf);
259 done:
260 return res;
263 static const struct super_operations v9fs_super_ops = {
264 #ifdef CONFIG_9P_FSCACHE
265 .alloc_inode = v9fs_alloc_inode,
266 .destroy_inode = v9fs_destroy_inode,
267 #endif
268 .statfs = simple_statfs,
269 .evict_inode = v9fs_evict_inode,
270 .show_options = generic_show_options,
271 .umount_begin = v9fs_umount_begin,
274 static const struct super_operations v9fs_super_ops_dotl = {
275 #ifdef CONFIG_9P_FSCACHE
276 .alloc_inode = v9fs_alloc_inode,
277 .destroy_inode = v9fs_destroy_inode,
278 #endif
279 .statfs = v9fs_statfs,
280 .evict_inode = v9fs_evict_inode,
281 .show_options = generic_show_options,
282 .umount_begin = v9fs_umount_begin,
285 struct file_system_type v9fs_fs_type = {
286 .name = "9p",
287 .get_sb = v9fs_get_sb,
288 .kill_sb = v9fs_kill_super,
289 .owner = THIS_MODULE,
290 .fs_flags = FS_RENAME_DOES_D_MOVE,