blob: 647d600f0bc82d7399732e83f8c2f71d5ab625b3 [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>
David Howells726c3342006-06-23 02:02:58 -070043#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include "vxfs.h"
46#include "vxfs_extern.h"
47#include "vxfs_dir.h"
48#include "vxfs_inode.h"
49
50
51MODULE_AUTHOR("Christoph Hellwig");
52MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
53MODULE_LICENSE("Dual BSD/GPL");
54
55MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
56
57
58static void vxfs_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070059static int vxfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static int vxfs_remount(struct super_block *, int *, char *);
61
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080062static const struct super_operations vxfs_super_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .read_inode = vxfs_read_inode,
64 .clear_inode = vxfs_clear_inode,
65 .put_super = vxfs_put_super,
66 .statfs = vxfs_statfs,
67 .remount_fs = vxfs_remount,
68};
69
70/**
71 * vxfs_put_super - free superblock resources
72 * @sbp: VFS superblock.
73 *
74 * Description:
75 * vxfs_put_super frees all resources allocated for @sbp
76 * after the last instance of the filesystem is unmounted.
77 */
78
79static void
80vxfs_put_super(struct super_block *sbp)
81{
82 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
83
84 vxfs_put_fake_inode(infp->vsi_fship);
85 vxfs_put_fake_inode(infp->vsi_ilist);
86 vxfs_put_fake_inode(infp->vsi_stilist);
87
88 brelse(infp->vsi_bp);
89 kfree(infp);
90}
91
92/**
93 * vxfs_statfs - get filesystem information
David Howells726c3342006-06-23 02:02:58 -070094 * @dentry: VFS dentry to locate superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 * @bufp: output buffer
96 *
97 * Description:
98 * vxfs_statfs fills the statfs buffer @bufp with information
David Howells726c3342006-06-23 02:02:58 -070099 * about the filesystem described by @dentry.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 *
101 * Returns:
102 * Zero.
103 *
104 * Locking:
105 * No locks held.
106 *
107 * Notes:
108 * This is everything but complete...
109 */
110static int
David Howells726c3342006-06-23 02:02:58 -0700111vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
David Howells726c3342006-06-23 02:02:58 -0700113 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 bufp->f_type = VXFS_SUPER_MAGIC;
David Howells726c3342006-06-23 02:02:58 -0700116 bufp->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 bufp->f_blocks = infp->vsi_raw->vs_dsize;
118 bufp->f_bfree = infp->vsi_raw->vs_free;
119 bufp->f_bavail = 0;
120 bufp->f_files = 0;
121 bufp->f_ffree = infp->vsi_raw->vs_ifree;
122 bufp->f_namelen = VXFS_NAMELEN;
123
124 return 0;
125}
126
127static int vxfs_remount(struct super_block *sb, int *flags, char *data)
128{
129 *flags |= MS_RDONLY;
130 return 0;
131}
132
133/**
134 * vxfs_read_super - read superblock into memory and initalize filesystem
135 * @sbp: VFS superblock (to fill)
136 * @dp: fs private mount data
137 * @silent: do not complain loudly when sth is wrong
138 *
139 * Description:
140 * We are called on the first mount of a filesystem to read the
141 * superblock into memory and do some basic setup.
142 *
143 * Returns:
144 * The superblock on success, else %NULL.
145 *
146 * Locking:
147 * We are under the bkl and @sbp->s_lock.
148 */
149static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
150{
151 struct vxfs_sb_info *infp;
152 struct vxfs_sb *rsbp;
153 struct buffer_head *bp = NULL;
154 u_long bsize;
155 struct inode *root;
156
157 sbp->s_flags |= MS_RDONLY;
158
Pekka Enberge915fc42005-09-06 15:18:35 -0700159 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (!infp) {
161 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
162 return -ENOMEM;
163 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
166 if (!bsize) {
167 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
168 goto out;
169 }
170
171 bp = sb_bread(sbp, 1);
172 if (!bp || !buffer_mapped(bp)) {
173 if (!silent) {
174 printk(KERN_WARNING
175 "vxfs: unable to read disk superblock\n");
176 }
177 goto out;
178 }
179
180 rsbp = (struct vxfs_sb *)bp->b_data;
181 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
182 if (!silent)
183 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
184 goto out;
185 }
186
187 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
188 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
189 rsbp->vs_version);
190 goto out;
191 }
192
193#ifdef DIAGNOSTIC
194 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
195 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
196#endif
197
198 sbp->s_magic = rsbp->vs_magic;
Pekka Enberg8cb681b2005-06-30 02:59:05 -0700199 sbp->s_fs_info = infp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 infp->vsi_raw = rsbp;
202 infp->vsi_bp = bp;
203 infp->vsi_oltext = rsbp->vs_oltext[0];
204 infp->vsi_oltsize = rsbp->vs_oltsize;
205
206 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
207 printk(KERN_WARNING "vxfs: unable to set final block size\n");
208 goto out;
209 }
210
211 if (vxfs_read_olt(sbp, bsize)) {
212 printk(KERN_WARNING "vxfs: unable to read olt\n");
213 goto out;
214 }
215
216 if (vxfs_read_fshead(sbp)) {
217 printk(KERN_WARNING "vxfs: unable to read fshead\n");
218 goto out;
219 }
220
221 sbp->s_op = &vxfs_super_ops;
222 root = iget(sbp, VXFS_ROOT_INO);
223 sbp->s_root = d_alloc_root(root);
224 if (!sbp->s_root) {
225 iput(root);
226 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
227 goto out_free_ilist;
228 }
229
230 return 0;
231
232out_free_ilist:
233 vxfs_put_fake_inode(infp->vsi_fship);
234 vxfs_put_fake_inode(infp->vsi_ilist);
235 vxfs_put_fake_inode(infp->vsi_stilist);
236out:
237 brelse(bp);
238 kfree(infp);
239 return -EINVAL;
240}
241
242/*
243 * The usual module blurb.
244 */
David Howells454e2392006-06-23 02:02:57 -0700245static int vxfs_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
David Howells454e2392006-06-23 02:02:57 -0700248 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super,
249 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
252static struct file_system_type vxfs_fs_type = {
253 .owner = THIS_MODULE,
254 .name = "vxfs",
255 .get_sb = vxfs_get_sb,
256 .kill_sb = kill_block_super,
257 .fs_flags = FS_REQUIRES_DEV,
258};
259
260static int __init
261vxfs_init(void)
262{
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700263 int rv;
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
266 sizeof(struct vxfs_inode_info), 0,
Paul Jackson4b6a9312006-03-24 03:16:05 -0800267 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL, NULL);
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700268 if (!vxfs_inode_cachep)
269 return -ENOMEM;
270 rv = register_filesystem(&vxfs_fs_type);
271 if (rv < 0)
272 kmem_cache_destroy(vxfs_inode_cachep);
273 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274}
275
276static void __exit
277vxfs_cleanup(void)
278{
279 unregister_filesystem(&vxfs_fs_type);
280 kmem_cache_destroy(vxfs_inode_cachep);
281}
282
283module_init(vxfs_init);
284module_exit(vxfs_cleanup);