blob: 9d1c99558389dabd0b11329ddcb51bcd4d9711f6 [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 = {
Al Virob57922d2010-06-07 14:34:48 -040063 .evict_inode = vxfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 .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
David Howells726c3342006-06-23 02:02:58 -070093 * @dentry: VFS dentry to locate superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 * @bufp: output buffer
95 *
96 * Description:
97 * vxfs_statfs fills the statfs buffer @bufp with information
David Howells726c3342006-06-23 02:02:58 -070098 * about the filesystem described by @dentry.
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 *
100 * Returns:
101 * Zero.
102 *
103 * Locking:
104 * No locks held.
105 *
106 * Notes:
107 * This is everything but complete...
108 */
109static int
David Howells726c3342006-06-23 02:02:58 -0700110vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
David Howells726c3342006-06-23 02:02:58 -0700112 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 bufp->f_type = VXFS_SUPER_MAGIC;
David Howells726c3342006-06-23 02:02:58 -0700115 bufp->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 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/**
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200133 * vxfs_read_super - read superblock into memory and initialize filesystem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 * @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:
Jan Blunckdb719222010-08-15 22:51:10 +0200146 * We are under @sbp->s_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 */
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;
David Howellsd0b07942008-02-07 00:15:39 -0800155 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
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;
David Howellsd0b07942008-02-07 00:15:39 -0800222 root = vxfs_iget(sbp, VXFS_ROOT_INO);
223 if (IS_ERR(root)) {
224 ret = PTR_ERR(root);
225 goto out;
226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 sbp->s_root = d_alloc_root(root);
228 if (!sbp->s_root) {
229 iput(root);
230 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
231 goto out_free_ilist;
232 }
233
234 return 0;
235
236out_free_ilist:
237 vxfs_put_fake_inode(infp->vsi_fship);
238 vxfs_put_fake_inode(infp->vsi_ilist);
239 vxfs_put_fake_inode(infp->vsi_stilist);
240out:
241 brelse(bp);
242 kfree(infp);
David Howellsd0b07942008-02-07 00:15:39 -0800243 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
246/*
247 * The usual module blurb.
248 */
Al Viro152a0832010-07-25 00:46:55 +0400249static struct dentry *vxfs_mount(struct file_system_type *fs_type,
250 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Al Viro152a0832010-07-25 00:46:55 +0400252 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255static struct file_system_type vxfs_fs_type = {
256 .owner = THIS_MODULE,
257 .name = "vxfs",
Al Viro152a0832010-07-25 00:46:55 +0400258 .mount = vxfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 .kill_sb = kill_block_super,
260 .fs_flags = FS_REQUIRES_DEV,
261};
262
263static int __init
264vxfs_init(void)
265{
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700266 int rv;
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
Paul Mundt20c2df82007-07-20 10:11:58 +0900269 sizeof(struct vxfs_inode_info), 0,
270 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
Alexey Dobriyana4376e12006-09-29 02:01:04 -0700271 if (!vxfs_inode_cachep)
272 return -ENOMEM;
273 rv = register_filesystem(&vxfs_fs_type);
274 if (rv < 0)
275 kmem_cache_destroy(vxfs_inode_cachep);
276 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277}
278
279static void __exit
280vxfs_cleanup(void)
281{
282 unregister_filesystem(&vxfs_fs_type);
283 kmem_cache_destroy(vxfs_inode_cachep);
284}
285
286module_init(vxfs_init);
287module_exit(vxfs_cleanup);