Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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> |
| 43 | |
| 44 | #include "vxfs.h" |
| 45 | #include "vxfs_extern.h" |
| 46 | #include "vxfs_dir.h" |
| 47 | #include "vxfs_inode.h" |
| 48 | |
| 49 | |
| 50 | MODULE_AUTHOR("Christoph Hellwig"); |
| 51 | MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); |
| 52 | MODULE_LICENSE("Dual BSD/GPL"); |
| 53 | |
| 54 | MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */ |
| 55 | |
| 56 | |
| 57 | static void vxfs_put_super(struct super_block *); |
| 58 | static int vxfs_statfs(struct super_block *, struct kstatfs *); |
| 59 | static int vxfs_remount(struct super_block *, int *, char *); |
| 60 | |
| 61 | static struct super_operations vxfs_super_ops = { |
| 62 | .read_inode = vxfs_read_inode, |
| 63 | .clear_inode = vxfs_clear_inode, |
| 64 | .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 | |
| 78 | static void |
| 79 | vxfs_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 |
| 93 | * @sbp: VFS superblock |
| 94 | * @bufp: output buffer |
| 95 | * |
| 96 | * Description: |
| 97 | * vxfs_statfs fills the statfs buffer @bufp with information |
| 98 | * about the filesystem described by @sbp. |
| 99 | * |
| 100 | * Returns: |
| 101 | * Zero. |
| 102 | * |
| 103 | * Locking: |
| 104 | * No locks held. |
| 105 | * |
| 106 | * Notes: |
| 107 | * This is everything but complete... |
| 108 | */ |
| 109 | static int |
| 110 | vxfs_statfs(struct super_block *sbp, struct kstatfs *bufp) |
| 111 | { |
| 112 | struct vxfs_sb_info *infp = VXFS_SBI(sbp); |
| 113 | |
| 114 | bufp->f_type = VXFS_SUPER_MAGIC; |
| 115 | bufp->f_bsize = sbp->s_blocksize; |
| 116 | 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 | |
| 126 | static int vxfs_remount(struct super_block *sb, int *flags, char *data) |
| 127 | { |
| 128 | *flags |= MS_RDONLY; |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * vxfs_read_super - read superblock into memory and initalize filesystem |
| 134 | * @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: |
| 146 | * We are under the bkl and @sbp->s_lock. |
| 147 | */ |
| 148 | static 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; |
| 155 | |
| 156 | sbp->s_flags |= MS_RDONLY; |
| 157 | |
Pekka Enberg | e915fc4 | 2005-09-06 15:18:35 -0700 | [diff] [blame] | 158 | infp = kzalloc(sizeof(*infp), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if (!infp) { |
| 160 | printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); |
| 161 | return -ENOMEM; |
| 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 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 Enberg | 8cb681b | 2005-06-30 02:59:05 -0700 | [diff] [blame] | 198 | sbp->s_fs_info = infp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 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; |
| 221 | root = iget(sbp, VXFS_ROOT_INO); |
| 222 | sbp->s_root = d_alloc_root(root); |
| 223 | if (!sbp->s_root) { |
| 224 | iput(root); |
| 225 | printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); |
| 226 | goto out_free_ilist; |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | |
| 231 | out_free_ilist: |
| 232 | vxfs_put_fake_inode(infp->vsi_fship); |
| 233 | vxfs_put_fake_inode(infp->vsi_ilist); |
| 234 | vxfs_put_fake_inode(infp->vsi_stilist); |
| 235 | out: |
| 236 | brelse(bp); |
| 237 | kfree(infp); |
| 238 | return -EINVAL; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * The usual module blurb. |
| 243 | */ |
| 244 | static struct super_block *vxfs_get_sb(struct file_system_type *fs_type, |
| 245 | int flags, const char *dev_name, void *data) |
| 246 | { |
| 247 | return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); |
| 248 | } |
| 249 | |
| 250 | static struct file_system_type vxfs_fs_type = { |
| 251 | .owner = THIS_MODULE, |
| 252 | .name = "vxfs", |
| 253 | .get_sb = vxfs_get_sb, |
| 254 | .kill_sb = kill_block_super, |
| 255 | .fs_flags = FS_REQUIRES_DEV, |
| 256 | }; |
| 257 | |
| 258 | static int __init |
| 259 | vxfs_init(void) |
| 260 | { |
| 261 | vxfs_inode_cachep = kmem_cache_create("vxfs_inode", |
| 262 | sizeof(struct vxfs_inode_info), 0, |
Paul Jackson | 4b6a931 | 2006-03-24 03:16:05 -0800 | [diff] [blame^] | 263 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (vxfs_inode_cachep) |
Pekka Enberg | 8cb681b | 2005-06-30 02:59:05 -0700 | [diff] [blame] | 265 | return register_filesystem(&vxfs_fs_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return -ENOMEM; |
| 267 | } |
| 268 | |
| 269 | static void __exit |
| 270 | vxfs_cleanup(void) |
| 271 | { |
| 272 | unregister_filesystem(&vxfs_fs_type); |
| 273 | kmem_cache_destroy(vxfs_inode_cachep); |
| 274 | } |
| 275 | |
| 276 | module_init(vxfs_init); |
| 277 | module_exit(vxfs_cleanup); |