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>
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 <linux/magic.h>
43 #include <net/9p/9p.h>
44 #include <net/9p/client.h>
52 static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
55 * v9fs_set_super - set the superblock
57 * @data: file system specific data
61 static int v9fs_set_super(struct super_block *s, void *data)
64 return set_anon_super(s, data);
68 * v9fs_fill_super - populate superblock with info
70 * @v9ses: session information
71 * @flags: flags propagated from v9fs_mount()
76 v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
77 int flags, void *data)
79 sb->s_maxbytes = MAX_LFS_FILESIZE;
80 sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
81 sb->s_blocksize = 1 << sb->s_blocksize_bits;
82 sb->s_magic = V9FS_MAGIC;
83 if (v9fs_proto_dotl(v9ses)) {
84 sb->s_op = &v9fs_super_ops_dotl;
85 sb->s_xattr = v9fs_xattr_handlers;
87 sb->s_op = &v9fs_super_ops;
88 sb->s_bdi = &v9ses->bdi;
90 sb->s_flags = flags | MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
92 sb->s_flags |= MS_SYNCHRONOUS;
94 #ifdef CONFIG_9P_FS_POSIX_ACL
95 if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
96 sb->s_flags |= MS_POSIXACL;
99 save_mount_options(sb, data);
103 * v9fs_mount - mount a superblock
104 * @fs_type: file system type
105 * @flags: mount flags
106 * @dev_name: device name that was mounted
107 * @data: mount options
111 static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
112 const char *dev_name, void *data)
114 struct super_block *sb = NULL;
115 struct inode *inode = NULL;
116 struct dentry *root = NULL;
117 struct v9fs_session_info *v9ses = NULL;
118 int mode = S_IRWXUGO | S_ISVTX;
122 P9_DPRINTK(P9_DEBUG_VFS, " \n");
124 v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
126 return ERR_PTR(-ENOMEM);
128 fid = v9fs_session_init(v9ses, dev_name, data);
130 retval = PTR_ERR(fid);
132 * we need to call session_close to tear down some
133 * of the data structure setup by session_init
138 sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
140 retval = PTR_ERR(sb);
143 v9fs_fill_super(sb, v9ses, flags, data);
146 sb->s_d_op = &v9fs_cached_dentry_operations;
148 sb->s_d_op = &v9fs_dentry_operations;
150 inode = v9fs_get_inode(sb, S_IFDIR | mode);
152 retval = PTR_ERR(inode);
156 root = d_alloc_root(inode);
163 if (v9fs_proto_dotl(v9ses)) {
164 struct p9_stat_dotl *st = NULL;
165 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
167 retval = PTR_ERR(st);
171 v9fs_stat2inode_dotl(st, root->d_inode);
174 struct p9_wstat *st = NULL;
175 st = p9_client_stat(fid);
177 retval = PTR_ERR(st);
181 root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
182 v9fs_stat2inode(st, root->d_inode, sb);
187 retval = v9fs_get_acl(inode, fid);
190 v9fs_fid_add(root, fid);
192 P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
193 return dget(sb->s_root);
196 p9_client_clunk(fid);
198 v9fs_session_close(v9ses);
200 return ERR_PTR(retval);
204 * we will do the session_close and root dentry release
205 * in the below call. But we need to clunk fid, because we haven't
206 * attached the fid to dentry so it won't get clunked
209 p9_client_clunk(fid);
210 deactivate_locked_super(sb);
211 return ERR_PTR(retval);
215 * v9fs_kill_super - Kill Superblock
220 static void v9fs_kill_super(struct super_block *s)
222 struct v9fs_session_info *v9ses = s->s_fs_info;
224 P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);
228 v9fs_session_cancel(v9ses);
229 v9fs_session_close(v9ses);
232 P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n");
236 v9fs_umount_begin(struct super_block *sb)
238 struct v9fs_session_info *v9ses;
240 v9ses = sb->s_fs_info;
241 v9fs_session_begin_cancel(v9ses);
244 static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
246 struct v9fs_session_info *v9ses;
248 struct p9_rstatfs rs;
251 fid = v9fs_fid_lookup(dentry);
257 v9ses = v9fs_inode2v9ses(dentry->d_inode);
258 if (v9fs_proto_dotl(v9ses)) {
259 res = p9_client_statfs(fid, &rs);
261 buf->f_type = V9FS_MAGIC;
262 buf->f_bsize = rs.bsize;
263 buf->f_blocks = rs.blocks;
264 buf->f_bfree = rs.bfree;
265 buf->f_bavail = rs.bavail;
266 buf->f_files = rs.files;
267 buf->f_ffree = rs.ffree;
268 buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
269 buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
270 buf->f_namelen = rs.namelen;
275 res = simple_statfs(dentry, buf);
280 static const struct super_operations v9fs_super_ops = {
281 #ifdef CONFIG_9P_FSCACHE
282 .alloc_inode = v9fs_alloc_inode,
283 .destroy_inode = v9fs_destroy_inode,
285 .statfs = simple_statfs,
286 .evict_inode = v9fs_evict_inode,
287 .show_options = generic_show_options,
288 .umount_begin = v9fs_umount_begin,
291 static const struct super_operations v9fs_super_ops_dotl = {
292 #ifdef CONFIG_9P_FSCACHE
293 .alloc_inode = v9fs_alloc_inode,
294 .destroy_inode = v9fs_destroy_inode,
296 .statfs = v9fs_statfs,
297 .evict_inode = v9fs_evict_inode,
298 .show_options = generic_show_options,
299 .umount_begin = v9fs_umount_begin,
302 struct file_system_type v9fs_fs_type = {
305 .kill_sb = v9fs_kill_super,
306 .owner = THIS_MODULE,
307 .fs_flags = FS_RENAME_DOES_D_MOVE,