blob: 1e8af939b3e4ad58d41726db3851269193a2e0c9 [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>
Alexey Dobriyan405f5572009-07-11 22:08:37 +040041#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/stat.h>
43#include <linux/vfs.h>
David Howells726c3342006-06-23 02:02:58 -070044#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include "vxfs.h"
47#include "vxfs_extern.h"
48#include "vxfs_dir.h"
49#include "vxfs_inode.h"
50
51
52MODULE_AUTHOR("Christoph Hellwig");
53MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
54MODULE_LICENSE("Dual BSD/GPL");
55
56MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
57
58
59static void vxfs_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070060static int vxfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static int vxfs_remount(struct super_block *, int *, char *);
62
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080063static const struct super_operations vxfs_super_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 .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
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020084 lock_kernel();
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 vxfs_put_fake_inode(infp->vsi_fship);
87 vxfs_put_fake_inode(infp->vsi_ilist);
88 vxfs_put_fake_inode(infp->vsi_stilist);
89
90 brelse(infp->vsi_bp);
91 kfree(infp);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020092
93 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
96/**
97 * vxfs_statfs - get filesystem information
David Howells726c3342006-06-23 02:02:58 -070098 * @dentry: VFS dentry to locate superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 * @bufp: output buffer
100 *
101 * Description:
102 * vxfs_statfs fills the statfs buffer @bufp with information
David Howells726c3342006-06-23 02:02:58 -0700103 * about the filesystem described by @dentry.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 *
105 * Returns:
106 * Zero.
107 *
108 * Locking:
109 * No locks held.
110 *
111 * Notes:
112 * This is everything but complete...
113 */
114static int
David Howells726c3342006-06-23 02:02:58 -0700115vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
David Howells726c3342006-06-23 02:02:58 -0700117 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 bufp->f_type = VXFS_SUPER_MAGIC;
David Howells726c3342006-06-23 02:02:58 -0700120 bufp->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 bufp->f_blocks = infp->vsi_raw->vs_dsize;
122 bufp->f_bfree = infp->vsi_raw->vs_free;
123 bufp->f_bavail = 0;
124 bufp->f_files = 0;
125 bufp->f_ffree = infp->vsi_raw->vs_ifree;
126 bufp->f_namelen = VXFS_NAMELEN;
127
128 return 0;
129}
130
131static int vxfs_remount(struct super_block *sb, int *flags, char *data)
132{
133 *flags |= MS_RDONLY;
134 return 0;
135}
136
137/**
138 * vxfs_read_super - read superblock into memory and initalize filesystem
139 * @sbp: VFS superblock (to fill)
140 * @dp: fs private mount data
141 * @silent: do not complain loudly when sth is wrong
142 *
143 * Description:
144 * We are called on the first mount of a filesystem to read the
145 * superblock into memory and do some basic setup.
146 *
147 * Returns:
148 * The superblock on success, else %NULL.
149 *
150 * Locking:
151 * We are under the bkl and @sbp->s_lock.
152 */
153static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
154{
155 struct vxfs_sb_info *infp;
156 struct vxfs_sb *rsbp;
157 struct buffer_head *bp = NULL;
158 u_long bsize;
159 struct inode *root;
David Howellsd0b07942008-02-07 00:15:39 -0800160 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 sbp->s_flags |= MS_RDONLY;
163
Pekka Enberge915fc42005-09-06 15:18:35 -0700164 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (!infp) {
166 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
167 return -ENOMEM;
168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
171 if (!bsize) {
172 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
173 goto out;
174 }
175
176 bp = sb_bread(sbp, 1);
177 if (!bp || !buffer_mapped(bp)) {
178 if (!silent) {
179 printk(KERN_WARNING
180 "vxfs: unable to read disk superblock\n");
181 }
182 goto out;
183 }
184
185 rsbp = (struct vxfs_sb *)bp->b_data;
186 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
187 if (!silent)
188 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
189 goto out;
190 }
191
192 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
193 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
194 rsbp->vs_version);
195 goto out;
196 }
197
198#ifdef DIAGNOSTIC
199 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
200 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
201#endif
202
203 sbp->s_magic = rsbp->vs_magic;
Pekka Enberg8cb681b2005-06-30 02:59:05 -0700204 sbp->s_fs_info = infp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 infp->vsi_raw = rsbp;
207 infp->vsi_bp = bp;
208 infp->vsi_oltext = rsbp->vs_oltext[0];
209 infp->vsi_oltsize = rsbp->vs_oltsize;
210
211 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
212 printk(KERN_WARNING "vxfs: unable to set final block size\n");
213 goto out;
214 }
215
216 if (vxfs_read_olt(sbp, bsize)) {
217 printk(KERN_WARNING "vxfs: unable to read olt\n");
218 goto out;
219 }
220
221 if (vxfs_read_fshead(sbp)) {
222 printk(KERN_WARNING "vxfs: unable to read fshead\n");
223 goto out;
224 }
225
226 sbp->s_op = &vxfs_super_ops;
David Howellsd0b07942008-02-07 00:15:39 -0800227 root = vxfs_iget(sbp, VXFS_ROOT_INO);
228 if (IS_ERR(root)) {
229 ret = PTR_ERR(root);
230 goto out;
231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 sbp->s_root = d_alloc_root(root);
233 if (!sbp->s_root) {
234 iput(root);
235 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
236 goto out_free_ilist;
237 }
238
239 return 0;
240
241out_free_ilist:
242 vxfs_put_fake_inode(infp->vsi_fship);
243 vxfs_put_fake_inode(infp->vsi_ilist);
244 vxfs_put_fake_inode(infp->vsi_stilist);
245out:
246 brelse(bp);
247 kfree(infp);
David Howellsd0b07942008-02-07 00:15:39 -0800248 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
251/*
252 * The usual module blurb.
253 */
David Howells454e2392006-06-23 02:02:57 -0700254static int vxfs_get_sb(struct file_system_type *fs_type,
255 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
David Howells454e2392006-06-23 02:02:57 -0700257 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super,
258 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
261static struct file_system_type vxfs_fs_type = {
262 .owner = THIS_MODULE,
263 .name = "vxfs",
264 .get_sb = vxfs_get_sb,
265 .kill_sb = kill_block_super,
266 .fs_flags = FS_REQUIRES_DEV,
267};
268
269static int __init
270vxfs_init(void)
271{
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700272 int rv;
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
Paul Mundt20c2df82007-07-20 10:11:58 +0900275 sizeof(struct vxfs_inode_info), 0,
276 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700277 if (!vxfs_inode_cachep)
278 return -ENOMEM;
279 rv = register_filesystem(&vxfs_fs_type);
280 if (rv < 0)
281 kmem_cache_destroy(vxfs_inode_cachep);
282 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285static void __exit
286vxfs_cleanup(void)
287{
288 unregister_filesystem(&vxfs_fs_type);
289 kmem_cache_destroy(vxfs_inode_cachep);
290}
291
292module_init(vxfs_init);
293module_exit(vxfs_cleanup);