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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56
57static void vxfs_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070058static int vxfs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059static int vxfs_remount(struct super_block *, int *, char *);
60
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080061static const struct super_operations vxfs_super_ops = {
Al Virob57922d2010-06-07 14:34:48 -040062 .evict_inode = vxfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .put_super = vxfs_put_super,
64 .statfs = vxfs_statfs,
65 .remount_fs = vxfs_remount,
66};
67
68/**
69 * vxfs_put_super - free superblock resources
70 * @sbp: VFS superblock.
71 *
72 * Description:
73 * vxfs_put_super frees all resources allocated for @sbp
74 * after the last instance of the filesystem is unmounted.
75 */
76
77static void
78vxfs_put_super(struct super_block *sbp)
79{
80 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
81
82 vxfs_put_fake_inode(infp->vsi_fship);
83 vxfs_put_fake_inode(infp->vsi_ilist);
84 vxfs_put_fake_inode(infp->vsi_stilist);
85
86 brelse(infp->vsi_bp);
87 kfree(infp);
88}
89
90/**
91 * vxfs_statfs - get filesystem information
David Howells726c3342006-06-23 02:02:58 -070092 * @dentry: VFS dentry to locate superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 * @bufp: output buffer
94 *
95 * Description:
96 * vxfs_statfs fills the statfs buffer @bufp with information
David Howells726c3342006-06-23 02:02:58 -070097 * about the filesystem described by @dentry.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 *
99 * Returns:
100 * Zero.
101 *
102 * Locking:
103 * No locks held.
104 *
105 * Notes:
106 * This is everything but complete...
107 */
108static int
David Howells726c3342006-06-23 02:02:58 -0700109vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
David Howells726c3342006-06-23 02:02:58 -0700111 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 bufp->f_type = VXFS_SUPER_MAGIC;
David Howells726c3342006-06-23 02:02:58 -0700114 bufp->f_bsize = dentry->d_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 bufp->f_blocks = infp->vsi_raw->vs_dsize;
116 bufp->f_bfree = infp->vsi_raw->vs_free;
117 bufp->f_bavail = 0;
118 bufp->f_files = 0;
119 bufp->f_ffree = infp->vsi_raw->vs_ifree;
120 bufp->f_namelen = VXFS_NAMELEN;
121
122 return 0;
123}
124
125static int vxfs_remount(struct super_block *sb, int *flags, char *data)
126{
127 *flags |= MS_RDONLY;
128 return 0;
129}
130
131/**
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200132 * vxfs_read_super - read superblock into memory and initialize filesystem
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * @sbp: VFS superblock (to fill)
134 * @dp: fs private mount data
135 * @silent: do not complain loudly when sth is wrong
136 *
137 * Description:
138 * We are called on the first mount of a filesystem to read the
139 * superblock into memory and do some basic setup.
140 *
141 * Returns:
142 * The superblock on success, else %NULL.
143 *
144 * Locking:
Jan Blunckdb719222010-08-15 22:51:10 +0200145 * We are under @sbp->s_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 */
147static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
148{
149 struct vxfs_sb_info *infp;
150 struct vxfs_sb *rsbp;
151 struct buffer_head *bp = NULL;
152 u_long bsize;
153 struct inode *root;
David Howellsd0b07942008-02-07 00:15:39 -0800154 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
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;
David Howellsd0b07942008-02-07 00:15:39 -0800221 root = vxfs_iget(sbp, VXFS_ROOT_INO);
222 if (IS_ERR(root)) {
223 ret = PTR_ERR(root);
224 goto out;
225 }
Al Viro48fde702012-01-08 22:15:13 -0500226 sbp->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 if (!sbp->s_root) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
229 goto out_free_ilist;
230 }
231
232 return 0;
233
234out_free_ilist:
235 vxfs_put_fake_inode(infp->vsi_fship);
236 vxfs_put_fake_inode(infp->vsi_ilist);
237 vxfs_put_fake_inode(infp->vsi_stilist);
238out:
239 brelse(bp);
240 kfree(infp);
David Howellsd0b07942008-02-07 00:15:39 -0800241 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244/*
245 * The usual module blurb.
246 */
Al Viro152a0832010-07-25 00:46:55 +0400247static struct dentry *vxfs_mount(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Al Viro152a0832010-07-25 00:46:55 +0400250 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
253static struct file_system_type vxfs_fs_type = {
254 .owner = THIS_MODULE,
255 .name = "vxfs",
Al Viro152a0832010-07-25 00:46:55 +0400256 .mount = vxfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 .kill_sb = kill_block_super,
258 .fs_flags = FS_REQUIRES_DEV,
259};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800260MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700261MODULE_ALIAS("vxfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
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);
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000283 /*
284 * Make sure all delayed rcu free inodes are flushed before we
285 * destroy cache.
286 */
287 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 kmem_cache_destroy(vxfs_inode_cachep);
289}
290
291module_init(vxfs_init);
292module_exit(vxfs_cleanup);