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 #include <linux/mount.h> 44 45 #include "vxfs.h" 46 #include "vxfs_extern.h" 47 #include "vxfs_dir.h" 48 #include "vxfs_inode.h" 49 50 51 MODULE_AUTHOR("Christoph Hellwig"); 52 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); 53 MODULE_LICENSE("Dual BSD/GPL"); 54 55 MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */ 56 57 58 static void vxfs_put_super(struct super_block *); 59 static int vxfs_statfs(struct dentry *, struct kstatfs *); 60 static int vxfs_remount(struct super_block *, int *, char *); 61 62 static const struct super_operations vxfs_super_ops = { 63 .read_inode = vxfs_read_inode, 64 .clear_inode = vxfs_clear_inode, 65 .put_super = vxfs_put_super, 66 .statfs = vxfs_statfs, 67 .remount_fs = vxfs_remount, 68 }; 69 70 /** 71 * vxfs_put_super - free superblock resources 72 * @sbp: VFS superblock. 73 * 74 * Description: 75 * vxfs_put_super frees all resources allocated for @sbp 76 * after the last instance of the filesystem is unmounted. 77 */ 78 79 static void 80 vxfs_put_super(struct super_block *sbp) 81 { 82 struct vxfs_sb_info *infp = VXFS_SBI(sbp); 83 84 vxfs_put_fake_inode(infp->vsi_fship); 85 vxfs_put_fake_inode(infp->vsi_ilist); 86 vxfs_put_fake_inode(infp->vsi_stilist); 87 88 brelse(infp->vsi_bp); 89 kfree(infp); 90 } 91 92 /** 93 * vxfs_statfs - get filesystem information 94 * @dentry: VFS dentry to locate superblock 95 * @bufp: output buffer 96 * 97 * Description: 98 * vxfs_statfs fills the statfs buffer @bufp with information 99 * about the filesystem described by @dentry. 100 * 101 * Returns: 102 * Zero. 103 * 104 * Locking: 105 * No locks held. 106 * 107 * Notes: 108 * This is everything but complete... 109 */ 110 static int 111 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) 112 { 113 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); 114 115 bufp->f_type = VXFS_SUPER_MAGIC; 116 bufp->f_bsize = dentry->d_sb->s_blocksize; 117 bufp->f_blocks = infp->vsi_raw->vs_dsize; 118 bufp->f_bfree = infp->vsi_raw->vs_free; 119 bufp->f_bavail = 0; 120 bufp->f_files = 0; 121 bufp->f_ffree = infp->vsi_raw->vs_ifree; 122 bufp->f_namelen = VXFS_NAMELEN; 123 124 return 0; 125 } 126 127 static int vxfs_remount(struct super_block *sb, int *flags, char *data) 128 { 129 *flags |= MS_RDONLY; 130 return 0; 131 } 132 133 /** 134 * vxfs_read_super - read superblock into memory and initalize filesystem 135 * @sbp: VFS superblock (to fill) 136 * @dp: fs private mount data 137 * @silent: do not complain loudly when sth is wrong 138 * 139 * Description: 140 * We are called on the first mount of a filesystem to read the 141 * superblock into memory and do some basic setup. 142 * 143 * Returns: 144 * The superblock on success, else %NULL. 145 * 146 * Locking: 147 * We are under the bkl and @sbp->s_lock. 148 */ 149 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) 150 { 151 struct vxfs_sb_info *infp; 152 struct vxfs_sb *rsbp; 153 struct buffer_head *bp = NULL; 154 u_long bsize; 155 struct inode *root; 156 157 sbp->s_flags |= MS_RDONLY; 158 159 infp = kzalloc(sizeof(*infp), GFP_KERNEL); 160 if (!infp) { 161 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); 162 return -ENOMEM; 163 } 164 165 bsize = sb_min_blocksize(sbp, BLOCK_SIZE); 166 if (!bsize) { 167 printk(KERN_WARNING "vxfs: unable to set blocksize\n"); 168 goto out; 169 } 170 171 bp = sb_bread(sbp, 1); 172 if (!bp || !buffer_mapped(bp)) { 173 if (!silent) { 174 printk(KERN_WARNING 175 "vxfs: unable to read disk superblock\n"); 176 } 177 goto out; 178 } 179 180 rsbp = (struct vxfs_sb *)bp->b_data; 181 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) { 182 if (!silent) 183 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n"); 184 goto out; 185 } 186 187 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) { 188 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", 189 rsbp->vs_version); 190 goto out; 191 } 192 193 #ifdef DIAGNOSTIC 194 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version); 195 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize); 196 #endif 197 198 sbp->s_magic = rsbp->vs_magic; 199 sbp->s_fs_info = infp; 200 201 infp->vsi_raw = rsbp; 202 infp->vsi_bp = bp; 203 infp->vsi_oltext = rsbp->vs_oltext[0]; 204 infp->vsi_oltsize = rsbp->vs_oltsize; 205 206 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) { 207 printk(KERN_WARNING "vxfs: unable to set final block size\n"); 208 goto out; 209 } 210 211 if (vxfs_read_olt(sbp, bsize)) { 212 printk(KERN_WARNING "vxfs: unable to read olt\n"); 213 goto out; 214 } 215 216 if (vxfs_read_fshead(sbp)) { 217 printk(KERN_WARNING "vxfs: unable to read fshead\n"); 218 goto out; 219 } 220 221 sbp->s_op = &vxfs_super_ops; 222 root = iget(sbp, VXFS_ROOT_INO); 223 sbp->s_root = d_alloc_root(root); 224 if (!sbp->s_root) { 225 iput(root); 226 printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); 227 goto out_free_ilist; 228 } 229 230 return 0; 231 232 out_free_ilist: 233 vxfs_put_fake_inode(infp->vsi_fship); 234 vxfs_put_fake_inode(infp->vsi_ilist); 235 vxfs_put_fake_inode(infp->vsi_stilist); 236 out: 237 brelse(bp); 238 kfree(infp); 239 return -EINVAL; 240 } 241 242 /* 243 * The usual module blurb. 244 */ 245 static int vxfs_get_sb(struct file_system_type *fs_type, 246 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 247 { 248 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super, 249 mnt); 250 } 251 252 static struct file_system_type vxfs_fs_type = { 253 .owner = THIS_MODULE, 254 .name = "vxfs", 255 .get_sb = vxfs_get_sb, 256 .kill_sb = kill_block_super, 257 .fs_flags = FS_REQUIRES_DEV, 258 }; 259 260 static int __init 261 vxfs_init(void) 262 { 263 int rv; 264 265 vxfs_inode_cachep = kmem_cache_create("vxfs_inode", 266 sizeof(struct vxfs_inode_info), 0, 267 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); 268 if (!vxfs_inode_cachep) 269 return -ENOMEM; 270 rv = register_filesystem(&vxfs_fs_type); 271 if (rv < 0) 272 kmem_cache_destroy(vxfs_inode_cachep); 273 return rv; 274 } 275 276 static void __exit 277 vxfs_cleanup(void) 278 { 279 unregister_filesystem(&vxfs_fs_type); 280 kmem_cache_destroy(vxfs_inode_cachep); 281 } 282 283 module_init(vxfs_init); 284 module_exit(vxfs_cleanup); 285