2 * Copyright (c) 2000-2001 Christoph Hellwig.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
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
31 * Veritas filesystem driver - superblock related routines.
33 #include <linux/init.h>
34 #include <linux/module.h>
36 #include <linux/blkdev.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 #include <linux/mount.h>
46 #include "vxfs_extern.h"
48 #include "vxfs_inode.h"
51 MODULE_AUTHOR("Christoph Hellwig");
52 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
53 MODULE_LICENSE("Dual BSD/GPL");
57 static void vxfs_put_super(struct super_block *);
58 static int vxfs_statfs(struct dentry *, struct kstatfs *);
59 static int vxfs_remount(struct super_block *, int *, char *);
61 static const struct super_operations vxfs_super_ops = {
62 .evict_inode = vxfs_evict_inode,
63 .put_super = vxfs_put_super,
64 .statfs = vxfs_statfs,
65 .remount_fs = vxfs_remount,
69 * vxfs_put_super - free superblock resources
70 * @sbp: VFS superblock.
73 * vxfs_put_super frees all resources allocated for @sbp
74 * after the last instance of the filesystem is unmounted.
78 vxfs_put_super(struct super_block *sbp)
80 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
82 iput(infp->vsi_fship);
83 iput(infp->vsi_ilist);
84 iput(infp->vsi_stilist);
91 * vxfs_statfs - get filesystem information
92 * @dentry: VFS dentry to locate superblock
93 * @bufp: output buffer
96 * vxfs_statfs fills the statfs buffer @bufp with information
97 * about the filesystem described by @dentry.
106 * This is everything but complete...
109 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
111 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
112 struct vxfs_sb *raw_sb = infp->vsi_raw;
114 bufp->f_type = VXFS_SUPER_MAGIC;
115 bufp->f_bsize = dentry->d_sb->s_blocksize;
116 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
117 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
120 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
121 bufp->f_namelen = VXFS_NAMELEN;
126 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
134 static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
135 unsigned blk, __fs32 magic)
137 struct buffer_head *bp;
138 struct vxfs_sb *rsbp;
139 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
142 bp = sb_bread(sbp, blk);
144 if (!bp || !buffer_mapped(bp)) {
147 "vxfs: unable to read disk superblock at %u\n",
154 rsbp = (struct vxfs_sb *)bp->b_data;
155 if (rsbp->vs_magic != magic) {
158 "vxfs: WRONG superblock magic %08x at %u\n",
159 rsbp->vs_magic, blk);
164 infp->vsi_raw = rsbp;
169 infp->vsi_raw = NULL;
178 * vxfs_read_super - read superblock into memory and initialize filesystem
179 * @sbp: VFS superblock (to fill)
180 * @dp: fs private mount data
181 * @silent: do not complain loudly when sth is wrong
184 * We are called on the first mount of a filesystem to read the
185 * superblock into memory and do some basic setup.
188 * The superblock on success, else %NULL.
191 * We are under @sbp->s_lock.
193 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
195 struct vxfs_sb_info *infp;
196 struct vxfs_sb *rsbp;
202 sbp->s_flags |= MS_RDONLY;
204 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
206 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
210 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
212 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
216 sbp->s_fs_info = infp;
218 if (!vxfs_try_sb_magic(sbp, silent, 1,
219 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
221 infp->byte_order = VXFS_BO_LE;
222 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
223 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
225 infp->byte_order = VXFS_BO_BE;
228 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
232 rsbp = infp->vsi_raw;
233 j = fs32_to_cpu(infp, rsbp->vs_version);
234 if ((j < 2 || j > 4) && !silent) {
235 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
240 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
241 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
242 fs32_to_cpu(infp, rsbp->vs_bsize));
245 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
247 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
248 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
250 j = fs32_to_cpu(infp, rsbp->vs_bsize);
251 if (!sb_set_blocksize(sbp, j)) {
252 printk(KERN_WARNING "vxfs: unable to set final block size\n");
256 if (vxfs_read_olt(sbp, bsize)) {
257 printk(KERN_WARNING "vxfs: unable to read olt\n");
261 if (vxfs_read_fshead(sbp)) {
262 printk(KERN_WARNING "vxfs: unable to read fshead\n");
266 sbp->s_op = &vxfs_super_ops;
267 root = vxfs_iget(sbp, VXFS_ROOT_INO);
272 sbp->s_root = d_make_root(root);
274 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
281 iput(infp->vsi_fship);
282 iput(infp->vsi_ilist);
283 iput(infp->vsi_stilist);
285 brelse(infp->vsi_bp);
291 * The usual module blurb.
293 static struct dentry *vxfs_mount(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *data)
296 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
299 static struct file_system_type vxfs_fs_type = {
300 .owner = THIS_MODULE,
303 .kill_sb = kill_block_super,
304 .fs_flags = FS_REQUIRES_DEV,
306 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
307 MODULE_ALIAS("vxfs");
314 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
315 sizeof(struct vxfs_inode_info), 0,
316 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
317 if (!vxfs_inode_cachep)
319 rv = register_filesystem(&vxfs_fs_type);
321 kmem_cache_destroy(vxfs_inode_cachep);
328 unregister_filesystem(&vxfs_fs_type);
330 * Make sure all delayed rcu free inodes are flushed before we
334 kmem_cache_destroy(vxfs_inode_cachep);
337 module_init(vxfs_init);
338 module_exit(vxfs_cleanup);