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");
55 static struct kmem_cache *vxfs_inode_cachep;
58 * vxfs_put_super - free superblock resources
59 * @sbp: VFS superblock.
62 * vxfs_put_super frees all resources allocated for @sbp
63 * after the last instance of the filesystem is unmounted.
67 vxfs_put_super(struct super_block *sbp)
69 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
71 iput(infp->vsi_fship);
72 iput(infp->vsi_ilist);
73 iput(infp->vsi_stilist);
80 * vxfs_statfs - get filesystem information
81 * @dentry: VFS dentry to locate superblock
82 * @bufp: output buffer
85 * vxfs_statfs fills the statfs buffer @bufp with information
86 * about the filesystem described by @dentry.
95 * This is everything but complete...
98 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
100 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
101 struct vxfs_sb *raw_sb = infp->vsi_raw;
103 bufp->f_type = VXFS_SUPER_MAGIC;
104 bufp->f_bsize = dentry->d_sb->s_blocksize;
105 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize);
106 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free);
109 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree);
110 bufp->f_namelen = VXFS_NAMELEN;
115 static int vxfs_remount(struct super_block *sb, int *flags, char *data)
122 static struct inode *vxfs_alloc_inode(struct super_block *sb)
124 struct vxfs_inode_info *vi;
126 vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL);
129 return &vi->vfs_inode;
132 static void vxfs_i_callback(struct rcu_head *head)
134 struct inode *inode = container_of(head, struct inode, i_rcu);
136 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode));
139 static void vxfs_destroy_inode(struct inode *inode)
141 call_rcu(&inode->i_rcu, vxfs_i_callback);
144 static const struct super_operations vxfs_super_ops = {
145 .alloc_inode = vxfs_alloc_inode,
146 .destroy_inode = vxfs_destroy_inode,
147 .evict_inode = vxfs_evict_inode,
148 .put_super = vxfs_put_super,
149 .statfs = vxfs_statfs,
150 .remount_fs = vxfs_remount,
153 static int vxfs_try_sb_magic(struct super_block *sbp, int silent,
154 unsigned blk, __fs32 magic)
156 struct buffer_head *bp;
157 struct vxfs_sb *rsbp;
158 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
161 bp = sb_bread(sbp, blk);
163 if (!bp || !buffer_mapped(bp)) {
166 "vxfs: unable to read disk superblock at %u\n",
173 rsbp = (struct vxfs_sb *)bp->b_data;
174 if (rsbp->vs_magic != magic) {
177 "vxfs: WRONG superblock magic %08x at %u\n",
178 rsbp->vs_magic, blk);
183 infp->vsi_raw = rsbp;
188 infp->vsi_raw = NULL;
197 * vxfs_read_super - read superblock into memory and initialize filesystem
198 * @sbp: VFS superblock (to fill)
199 * @dp: fs private mount data
200 * @silent: do not complain loudly when sth is wrong
203 * We are called on the first mount of a filesystem to read the
204 * superblock into memory and do some basic setup.
207 * The superblock on success, else %NULL.
210 * We are under @sbp->s_lock.
212 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
214 struct vxfs_sb_info *infp;
215 struct vxfs_sb *rsbp;
221 sbp->s_flags |= MS_RDONLY;
223 infp = kzalloc(sizeof(*infp), GFP_KERNEL);
225 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
229 bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
231 printk(KERN_WARNING "vxfs: unable to set blocksize\n");
235 sbp->s_op = &vxfs_super_ops;
236 sbp->s_fs_info = infp;
238 if (!vxfs_try_sb_magic(sbp, silent, 1,
239 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) {
241 infp->byte_order = VXFS_BO_LE;
242 } else if (!vxfs_try_sb_magic(sbp, silent, 8,
243 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) {
245 infp->byte_order = VXFS_BO_BE;
248 printk(KERN_NOTICE "vxfs: can't find superblock.\n");
252 rsbp = infp->vsi_raw;
253 j = fs32_to_cpu(infp, rsbp->vs_version);
254 if ((j < 2 || j > 4) && !silent) {
255 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j);
260 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j);
261 printk(KERN_DEBUG "vxfs: blocksize: %d\n",
262 fs32_to_cpu(infp, rsbp->vs_bsize));
265 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic);
267 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]);
268 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize);
270 j = fs32_to_cpu(infp, rsbp->vs_bsize);
271 if (!sb_set_blocksize(sbp, j)) {
272 printk(KERN_WARNING "vxfs: unable to set final block size\n");
276 if (vxfs_read_olt(sbp, bsize)) {
277 printk(KERN_WARNING "vxfs: unable to read olt\n");
281 if (vxfs_read_fshead(sbp)) {
282 printk(KERN_WARNING "vxfs: unable to read fshead\n");
286 root = vxfs_iget(sbp, VXFS_ROOT_INO);
291 sbp->s_root = d_make_root(root);
293 printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
300 iput(infp->vsi_fship);
301 iput(infp->vsi_ilist);
302 iput(infp->vsi_stilist);
304 brelse(infp->vsi_bp);
310 * The usual module blurb.
312 static struct dentry *vxfs_mount(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *data)
315 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
318 static struct file_system_type vxfs_fs_type = {
319 .owner = THIS_MODULE,
322 .kill_sb = kill_block_super,
323 .fs_flags = FS_REQUIRES_DEV,
325 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
326 MODULE_ALIAS("vxfs");
333 vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
334 sizeof(struct vxfs_inode_info), 0,
335 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
336 if (!vxfs_inode_cachep)
338 rv = register_filesystem(&vxfs_fs_type);
340 kmem_cache_destroy(vxfs_inode_cachep);
347 unregister_filesystem(&vxfs_fs_type);
349 * Make sure all delayed rcu free inodes are flushed before we
353 kmem_cache_destroy(vxfs_inode_cachep);
356 module_init(vxfs_init);
357 module_exit(vxfs_cleanup);