Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | /*
* Copyright (c) 2000-2001 Christoph Hellwig.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Veritas filesystem driver - superblock related routines.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/vfs.h>
#include <linux/mount.h>
#include "vxfs.h"
#include "vxfs_extern.h"
#include "vxfs_dir.h"
#include "vxfs_inode.h"
MODULE_AUTHOR("Christoph Hellwig");
MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */
static void vxfs_put_super(struct super_block *);
static int vxfs_statfs(struct dentry *, struct kstatfs *);
static int vxfs_remount(struct super_block *, int *, char *);
static const struct super_operations vxfs_super_ops = {
.evict_inode = vxfs_evict_inode,
.put_super = vxfs_put_super,
.statfs = vxfs_statfs,
.remount_fs = vxfs_remount,
};
/**
* vxfs_put_super - free superblock resources
* @sbp: VFS superblock.
*
* Description:
* vxfs_put_super frees all resources allocated for @sbp
* after the last instance of the filesystem is unmounted.
*/
static void
vxfs_put_super(struct super_block *sbp)
{
struct vxfs_sb_info *infp = VXFS_SBI(sbp);
vxfs_put_fake_inode(infp->vsi_fship);
vxfs_put_fake_inode(infp->vsi_ilist);
vxfs_put_fake_inode(infp->vsi_stilist);
brelse(infp->vsi_bp);
kfree(infp);
}
/**
* vxfs_statfs - get filesystem information
* @dentry: VFS dentry to locate superblock
* @bufp: output buffer
*
* Description:
* vxfs_statfs fills the statfs buffer @bufp with information
* about the filesystem described by @dentry.
*
* Returns:
* Zero.
*
* Locking:
* No locks held.
*
* Notes:
* This is everything but complete...
*/
static int
vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
{
struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb);
bufp->f_type = VXFS_SUPER_MAGIC;
bufp->f_bsize = dentry->d_sb->s_blocksize;
bufp->f_blocks = infp->vsi_raw->vs_dsize;
bufp->f_bfree = infp->vsi_raw->vs_free;
bufp->f_bavail = 0;
bufp->f_files = 0;
bufp->f_ffree = infp->vsi_raw->vs_ifree;
bufp->f_namelen = VXFS_NAMELEN;
return 0;
}
static int vxfs_remount(struct super_block *sb, int *flags, char *data)
{
*flags |= MS_RDONLY;
return 0;
}
/**
* vxfs_read_super - read superblock into memory and initialize filesystem
* @sbp: VFS superblock (to fill)
* @dp: fs private mount data
* @silent: do not complain loudly when sth is wrong
*
* Description:
* We are called on the first mount of a filesystem to read the
* superblock into memory and do some basic setup.
*
* Returns:
* The superblock on success, else %NULL.
*
* Locking:
* We are under @sbp->s_lock.
*/
static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
{
struct vxfs_sb_info *infp;
struct vxfs_sb *rsbp;
struct buffer_head *bp = NULL;
u_long bsize;
struct inode *root;
int ret = -EINVAL;
sbp->s_flags |= MS_RDONLY;
infp = kzalloc(sizeof(*infp), GFP_KERNEL);
if (!infp) {
printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
return -ENOMEM;
}
bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
if (!bsize) {
printk(KERN_WARNING "vxfs: unable to set blocksize\n");
goto out;
}
bp = sb_bread(sbp, 1);
if (!bp || !buffer_mapped(bp)) {
if (!silent) {
printk(KERN_WARNING
"vxfs: unable to read disk superblock\n");
}
goto out;
}
rsbp = (struct vxfs_sb *)bp->b_data;
if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
if (!silent)
printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
goto out;
}
if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
rsbp->vs_version);
goto out;
}
#ifdef DIAGNOSTIC
printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
#endif
sbp->s_magic = rsbp->vs_magic;
sbp->s_fs_info = infp;
infp->vsi_raw = rsbp;
infp->vsi_bp = bp;
infp->vsi_oltext = rsbp->vs_oltext[0];
infp->vsi_oltsize = rsbp->vs_oltsize;
if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
printk(KERN_WARNING "vxfs: unable to set final block size\n");
goto out;
}
if (vxfs_read_olt(sbp, bsize)) {
printk(KERN_WARNING "vxfs: unable to read olt\n");
goto out;
}
if (vxfs_read_fshead(sbp)) {
printk(KERN_WARNING "vxfs: unable to read fshead\n");
goto out;
}
sbp->s_op = &vxfs_super_ops;
root = vxfs_iget(sbp, VXFS_ROOT_INO);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto out;
}
sbp->s_root = d_alloc_root(root);
if (!sbp->s_root) {
iput(root);
printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
goto out_free_ilist;
}
return 0;
out_free_ilist:
vxfs_put_fake_inode(infp->vsi_fship);
vxfs_put_fake_inode(infp->vsi_ilist);
vxfs_put_fake_inode(infp->vsi_stilist);
out:
brelse(bp);
kfree(infp);
return ret;
}
/*
* The usual module blurb.
*/
static struct dentry *vxfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
}
static struct file_system_type vxfs_fs_type = {
.owner = THIS_MODULE,
.name = "vxfs",
.mount = vxfs_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static int __init
vxfs_init(void)
{
int rv;
vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
sizeof(struct vxfs_inode_info), 0,
SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
if (!vxfs_inode_cachep)
return -ENOMEM;
rv = register_filesystem(&vxfs_fs_type);
if (rv < 0)
kmem_cache_destroy(vxfs_inode_cachep);
return rv;
}
static void __exit
vxfs_cleanup(void)
{
unregister_filesystem(&vxfs_fs_type);
kmem_cache_destroy(vxfs_inode_cachep);
}
module_init(vxfs_init);
module_exit(vxfs_cleanup);
|