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 .evict_inode = vxfs_evict_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 * @dentry: VFS dentry to locate superblock 94 * @bufp: output buffer 95 * 96 * Description: 97 * vxfs_statfs fills the statfs buffer @bufp with information 98 * about the filesystem described by @dentry. 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 dentry *dentry, struct kstatfs *bufp) 111 { 112 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); 113 114 bufp->f_type = VXFS_SUPER_MAGIC; 115 bufp->f_bsize = dentry->d_sb->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 initialize 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 @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 int ret = -EINVAL; 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 = vxfs_iget(sbp, VXFS_ROOT_INO); 223 if (IS_ERR(root)) { 224 ret = PTR_ERR(root); 225 goto out; 226 } 227 sbp->s_root = d_make_root(root); 228 if (!sbp->s_root) { 229 printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); 230 goto out_free_ilist; 231 } 232 233 return 0; 234 235 out_free_ilist: 236 vxfs_put_fake_inode(infp->vsi_fship); 237 vxfs_put_fake_inode(infp->vsi_ilist); 238 vxfs_put_fake_inode(infp->vsi_stilist); 239 out: 240 brelse(bp); 241 kfree(infp); 242 return ret; 243 } 244 245 /* 246 * The usual module blurb. 247 */ 248 static struct dentry *vxfs_mount(struct file_system_type *fs_type, 249 int flags, const char *dev_name, void *data) 250 { 251 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); 252 } 253 254 static struct file_system_type vxfs_fs_type = { 255 .owner = THIS_MODULE, 256 .name = "vxfs", 257 .mount = vxfs_mount, 258 .kill_sb = kill_block_super, 259 .fs_flags = FS_REQUIRES_DEV, 260 }; 261 262 static int __init 263 vxfs_init(void) 264 { 265 int rv; 266 267 vxfs_inode_cachep = kmem_cache_create("vxfs_inode", 268 sizeof(struct vxfs_inode_info), 0, 269 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); 270 if (!vxfs_inode_cachep) 271 return -ENOMEM; 272 rv = register_filesystem(&vxfs_fs_type); 273 if (rv < 0) 274 kmem_cache_destroy(vxfs_inode_cachep); 275 return rv; 276 } 277 278 static void __exit 279 vxfs_cleanup(void) 280 { 281 unregister_filesystem(&vxfs_fs_type); 282 kmem_cache_destroy(vxfs_inode_cachep); 283 } 284 285 module_init(vxfs_init); 286 module_exit(vxfs_cleanup); 287