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 56 57 static void vxfs_put_super(struct super_block *); 58 static int vxfs_statfs(struct dentry *, struct kstatfs *); 59 static int vxfs_remount(struct super_block *, int *, char *); 60 61 static const struct super_operations vxfs_super_ops = { 62 .evict_inode = vxfs_evict_inode, 63 .put_super = vxfs_put_super, 64 .statfs = vxfs_statfs, 65 .remount_fs = vxfs_remount, 66 }; 67 68 /** 69 * vxfs_put_super - free superblock resources 70 * @sbp: VFS superblock. 71 * 72 * Description: 73 * vxfs_put_super frees all resources allocated for @sbp 74 * after the last instance of the filesystem is unmounted. 75 */ 76 77 static void 78 vxfs_put_super(struct super_block *sbp) 79 { 80 struct vxfs_sb_info *infp = VXFS_SBI(sbp); 81 82 vxfs_put_fake_inode(infp->vsi_fship); 83 vxfs_put_fake_inode(infp->vsi_ilist); 84 vxfs_put_fake_inode(infp->vsi_stilist); 85 86 brelse(infp->vsi_bp); 87 kfree(infp); 88 } 89 90 /** 91 * vxfs_statfs - get filesystem information 92 * @dentry: VFS dentry to locate superblock 93 * @bufp: output buffer 94 * 95 * Description: 96 * vxfs_statfs fills the statfs buffer @bufp with information 97 * about the filesystem described by @dentry. 98 * 99 * Returns: 100 * Zero. 101 * 102 * Locking: 103 * No locks held. 104 * 105 * Notes: 106 * This is everything but complete... 107 */ 108 static int 109 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) 110 { 111 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); 112 113 bufp->f_type = VXFS_SUPER_MAGIC; 114 bufp->f_bsize = dentry->d_sb->s_blocksize; 115 bufp->f_blocks = infp->vsi_raw->vs_dsize; 116 bufp->f_bfree = infp->vsi_raw->vs_free; 117 bufp->f_bavail = 0; 118 bufp->f_files = 0; 119 bufp->f_ffree = infp->vsi_raw->vs_ifree; 120 bufp->f_namelen = VXFS_NAMELEN; 121 122 return 0; 123 } 124 125 static int vxfs_remount(struct super_block *sb, int *flags, char *data) 126 { 127 *flags |= MS_RDONLY; 128 return 0; 129 } 130 131 /** 132 * vxfs_read_super - read superblock into memory and initialize filesystem 133 * @sbp: VFS superblock (to fill) 134 * @dp: fs private mount data 135 * @silent: do not complain loudly when sth is wrong 136 * 137 * Description: 138 * We are called on the first mount of a filesystem to read the 139 * superblock into memory and do some basic setup. 140 * 141 * Returns: 142 * The superblock on success, else %NULL. 143 * 144 * Locking: 145 * We are under @sbp->s_lock. 146 */ 147 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) 148 { 149 struct vxfs_sb_info *infp; 150 struct vxfs_sb *rsbp; 151 struct buffer_head *bp = NULL; 152 u_long bsize; 153 struct inode *root; 154 int ret = -EINVAL; 155 156 sbp->s_flags |= MS_RDONLY; 157 158 infp = kzalloc(sizeof(*infp), GFP_KERNEL); 159 if (!infp) { 160 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); 161 return -ENOMEM; 162 } 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; 198 sbp->s_fs_info = infp; 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 = vxfs_iget(sbp, VXFS_ROOT_INO); 222 if (IS_ERR(root)) { 223 ret = PTR_ERR(root); 224 goto out; 225 } 226 sbp->s_root = d_make_root(root); 227 if (!sbp->s_root) { 228 printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); 229 goto out_free_ilist; 230 } 231 232 return 0; 233 234 out_free_ilist: 235 vxfs_put_fake_inode(infp->vsi_fship); 236 vxfs_put_fake_inode(infp->vsi_ilist); 237 vxfs_put_fake_inode(infp->vsi_stilist); 238 out: 239 brelse(bp); 240 kfree(infp); 241 return ret; 242 } 243 244 /* 245 * The usual module blurb. 246 */ 247 static struct dentry *vxfs_mount(struct file_system_type *fs_type, 248 int flags, const char *dev_name, void *data) 249 { 250 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); 251 } 252 253 static struct file_system_type vxfs_fs_type = { 254 .owner = THIS_MODULE, 255 .name = "vxfs", 256 .mount = vxfs_mount, 257 .kill_sb = kill_block_super, 258 .fs_flags = FS_REQUIRES_DEV, 259 }; 260 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ 261 MODULE_ALIAS("vxfs"); 262 263 static int __init 264 vxfs_init(void) 265 { 266 int rv; 267 268 vxfs_inode_cachep = kmem_cache_create("vxfs_inode", 269 sizeof(struct vxfs_inode_info), 0, 270 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); 271 if (!vxfs_inode_cachep) 272 return -ENOMEM; 273 rv = register_filesystem(&vxfs_fs_type); 274 if (rv < 0) 275 kmem_cache_destroy(vxfs_inode_cachep); 276 return rv; 277 } 278 279 static void __exit 280 vxfs_cleanup(void) 281 { 282 unregister_filesystem(&vxfs_fs_type); 283 /* 284 * Make sure all delayed rcu free inodes are flushed before we 285 * destroy cache. 286 */ 287 rcu_barrier(); 288 kmem_cache_destroy(vxfs_inode_cachep); 289 } 290 291 module_init(vxfs_init); 292 module_exit(vxfs_cleanup); 293