blob: 6aa6fbe4f8ee9a5397408d59938140e38fa4c084 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Veritas filesystem driver - superblock related routines.
32 */
33#include <linux/init.h>
34#include <linux/module.h>
35
36#include <linux/blkdev.h>
37#include <linux/fs.h>
38#include <linux/buffer_head.h>
39#include <linux/kernel.h>
40#include <linux/slab.h>
41#include <linux/stat.h>
42#include <linux/vfs.h>
43
44#include "vxfs.h"
45#include "vxfs_extern.h"
46#include "vxfs_dir.h"
47#include "vxfs_inode.h"
48
49
50MODULE_AUTHOR("Christoph Hellwig");
51MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
52MODULE_LICENSE("Dual BSD/GPL");
53
54MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
55
56
57static void vxfs_put_super(struct super_block *);
58static int vxfs_statfs(struct super_block *, struct kstatfs *);
59static int vxfs_remount(struct super_block *, int *, char *);
60
61static struct super_operations vxfs_super_ops = {
62 .read_inode = vxfs_read_inode,
63 .clear_inode = vxfs_clear_inode,
64 .put_super = vxfs_put_super,
65 .statfs = vxfs_statfs,
66 .remount_fs = vxfs_remount,
67};
68
69/**
70 * vxfs_put_super - free superblock resources
71 * @sbp: VFS superblock.
72 *
73 * Description:
74 * vxfs_put_super frees all resources allocated for @sbp
75 * after the last instance of the filesystem is unmounted.
76 */
77
78static void
79vxfs_put_super(struct super_block *sbp)
80{
81 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
82
83 vxfs_put_fake_inode(infp->vsi_fship);
84 vxfs_put_fake_inode(infp->vsi_ilist);
85 vxfs_put_fake_inode(infp->vsi_stilist);
86
87 brelse(infp->vsi_bp);
88 kfree(infp);
89}
90
91/**
92 * vxfs_statfs - get filesystem information
93 * @sbp: VFS superblock
94 * @bufp: output buffer
95 *
96 * Description:
97 * vxfs_statfs fills the statfs buffer @bufp with information
98 * about the filesystem described by @sbp.
99 *
100 * Returns:
101 * Zero.
102 *
103 * Locking:
104 * No locks held.
105 *
106 * Notes:
107 * This is everything but complete...
108 */
109static int
110vxfs_statfs(struct super_block *sbp, struct kstatfs *bufp)
111{
112 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
113
114 bufp->f_type = VXFS_SUPER_MAGIC;
115 bufp->f_bsize = sbp->s_blocksize;
116 bufp->f_blocks = infp->vsi_raw->vs_dsize;
117 bufp->f_bfree = infp->vsi_raw->vs_free;
118 bufp->f_bavail = 0;
119 bufp->f_files = 0;
120 bufp->f_ffree = infp->vsi_raw->vs_ifree;
121 bufp->f_namelen = VXFS_NAMELEN;
122
123 return 0;
124}
125
126static int vxfs_remount(struct super_block *sb, int *flags, char *data)
127{
128 *flags |= MS_RDONLY;
129 return 0;
130}
131
132/**
133 * vxfs_read_super - read superblock into memory and initalize filesystem
134 * @sbp: VFS superblock (to fill)
135 * @dp: fs private mount data
136 * @silent: do not complain loudly when sth is wrong
137 *
138 * Description:
139 * We are called on the first mount of a filesystem to read the
140 * superblock into memory and do some basic setup.
141 *
142 * Returns:
143 * The superblock on success, else %NULL.
144 *
145 * Locking:
146 * We are under the bkl and @sbp->s_lock.
147 */
148static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
149{
150 struct vxfs_sb_info *infp;
151 struct vxfs_sb *rsbp;
152 struct buffer_head *bp = NULL;
153 u_long bsize;
154 struct inode *root;
155
156 sbp->s_flags |= MS_RDONLY;
157
Pekka Enberge915fc42005-09-06 15:18:35 -0700158 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (!infp) {
160 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
161 return -ENOMEM;
162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
164 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
165 if (!bsize) {
166 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
167 goto out;
168 }
169
170 bp = sb_bread(sbp, 1);
171 if (!bp || !buffer_mapped(bp)) {
172 if (!silent) {
173 printk(KERN_WARNING
174 "vxfs: unable to read disk superblock\n");
175 }
176 goto out;
177 }
178
179 rsbp = (struct vxfs_sb *)bp->b_data;
180 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
181 if (!silent)
182 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
183 goto out;
184 }
185
186 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
187 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
188 rsbp->vs_version);
189 goto out;
190 }
191
192#ifdef DIAGNOSTIC
193 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
194 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
195#endif
196
197 sbp->s_magic = rsbp->vs_magic;
Pekka Enberg8cb681b2005-06-30 02:59:05 -0700198 sbp->s_fs_info = infp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 infp->vsi_raw = rsbp;
201 infp->vsi_bp = bp;
202 infp->vsi_oltext = rsbp->vs_oltext[0];
203 infp->vsi_oltsize = rsbp->vs_oltsize;
204
205 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
206 printk(KERN_WARNING "vxfs: unable to set final block size\n");
207 goto out;
208 }
209
210 if (vxfs_read_olt(sbp, bsize)) {
211 printk(KERN_WARNING "vxfs: unable to read olt\n");
212 goto out;
213 }
214
215 if (vxfs_read_fshead(sbp)) {
216 printk(KERN_WARNING "vxfs: unable to read fshead\n");
217 goto out;
218 }
219
220 sbp->s_op = &vxfs_super_ops;
221 root = iget(sbp, VXFS_ROOT_INO);
222 sbp->s_root = d_alloc_root(root);
223 if (!sbp->s_root) {
224 iput(root);
225 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
226 goto out_free_ilist;
227 }
228
229 return 0;
230
231out_free_ilist:
232 vxfs_put_fake_inode(infp->vsi_fship);
233 vxfs_put_fake_inode(infp->vsi_ilist);
234 vxfs_put_fake_inode(infp->vsi_stilist);
235out:
236 brelse(bp);
237 kfree(infp);
238 return -EINVAL;
239}
240
241/*
242 * The usual module blurb.
243 */
244static struct super_block *vxfs_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *data)
246{
247 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
248}
249
250static struct file_system_type vxfs_fs_type = {
251 .owner = THIS_MODULE,
252 .name = "vxfs",
253 .get_sb = vxfs_get_sb,
254 .kill_sb = kill_block_super,
255 .fs_flags = FS_REQUIRES_DEV,
256};
257
258static int __init
259vxfs_init(void)
260{
261 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
262 sizeof(struct vxfs_inode_info), 0,
263 SLAB_RECLAIM_ACCOUNT, NULL, NULL);
264 if (vxfs_inode_cachep)
Pekka Enberg8cb681b2005-06-30 02:59:05 -0700265 return register_filesystem(&vxfs_fs_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -ENOMEM;
267}
268
269static void __exit
270vxfs_cleanup(void)
271{
272 unregister_filesystem(&vxfs_fs_type);
273 kmem_cache_destroy(vxfs_inode_cachep);
274}
275
276module_init(vxfs_init);
277module_exit(vxfs_cleanup);