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/smp_lock.h> 42#include <linux/stat.h> 43#include <linux/vfs.h> 44#include <linux/mount.h> 45 46#include "vxfs.h" 47#include "vxfs_extern.h" 48#include "vxfs_dir.h" 49#include "vxfs_inode.h" 50 51 52MODULE_AUTHOR("Christoph Hellwig"); 53MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); 54MODULE_LICENSE("Dual BSD/GPL"); 55 56MODULE_ALIAS("vxfs"); /* makes mount -t vxfs autoload the module */ 57 58 59static void vxfs_put_super(struct super_block *); 60static int vxfs_statfs(struct dentry *, struct kstatfs *); 61static int vxfs_remount(struct super_block *, int *, char *); 62 63static const struct super_operations vxfs_super_ops = { 64 .evict_inode = vxfs_evict_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 79static void 80vxfs_put_super(struct super_block *sbp) 81{ 82 struct vxfs_sb_info *infp = VXFS_SBI(sbp); 83 84 lock_kernel(); 85 86 vxfs_put_fake_inode(infp->vsi_fship); 87 vxfs_put_fake_inode(infp->vsi_ilist); 88 vxfs_put_fake_inode(infp->vsi_stilist); 89 90 brelse(infp->vsi_bp); 91 kfree(infp); 92 93 unlock_kernel(); 94} 95 96/** 97 * vxfs_statfs - get filesystem information 98 * @dentry: VFS dentry to locate superblock 99 * @bufp: output buffer 100 * 101 * Description: 102 * vxfs_statfs fills the statfs buffer @bufp with information 103 * about the filesystem described by @dentry. 104 * 105 * Returns: 106 * Zero. 107 * 108 * Locking: 109 * No locks held. 110 * 111 * Notes: 112 * This is everything but complete... 113 */ 114static int 115vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) 116{ 117 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); 118 119 bufp->f_type = VXFS_SUPER_MAGIC; 120 bufp->f_bsize = dentry->d_sb->s_blocksize; 121 bufp->f_blocks = infp->vsi_raw->vs_dsize; 122 bufp->f_bfree = infp->vsi_raw->vs_free; 123 bufp->f_bavail = 0; 124 bufp->f_files = 0; 125 bufp->f_ffree = infp->vsi_raw->vs_ifree; 126 bufp->f_namelen = VXFS_NAMELEN; 127 128 return 0; 129} 130 131static int vxfs_remount(struct super_block *sb, int *flags, char *data) 132{ 133 *flags |= MS_RDONLY; 134 return 0; 135} 136 137/** 138 * vxfs_read_super - read superblock into memory and initialize filesystem 139 * @sbp: VFS superblock (to fill) 140 * @dp: fs private mount data 141 * @silent: do not complain loudly when sth is wrong 142 * 143 * Description: 144 * We are called on the first mount of a filesystem to read the 145 * superblock into memory and do some basic setup. 146 * 147 * Returns: 148 * The superblock on success, else %NULL. 149 * 150 * Locking: 151 * We are under the bkl and @sbp->s_lock. 152 */ 153static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) 154{ 155 struct vxfs_sb_info *infp; 156 struct vxfs_sb *rsbp; 157 struct buffer_head *bp = NULL; 158 u_long bsize; 159 struct inode *root; 160 int ret = -EINVAL; 161 162 sbp->s_flags |= MS_RDONLY; 163 164 infp = kzalloc(sizeof(*infp), GFP_KERNEL); 165 if (!infp) { 166 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); 167 return -ENOMEM; 168 } 169 170 bsize = sb_min_blocksize(sbp, BLOCK_SIZE); 171 if (!bsize) { 172 printk(KERN_WARNING "vxfs: unable to set blocksize\n"); 173 goto out; 174 } 175 176 bp = sb_bread(sbp, 1); 177 if (!bp || !buffer_mapped(bp)) { 178 if (!silent) { 179 printk(KERN_WARNING 180 "vxfs: unable to read disk superblock\n"); 181 } 182 goto out; 183 } 184 185 rsbp = (struct vxfs_sb *)bp->b_data; 186 if (rsbp->vs_magic != VXFS_SUPER_MAGIC) { 187 if (!silent) 188 printk(KERN_NOTICE "vxfs: WRONG superblock magic\n"); 189 goto out; 190 } 191 192 if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) { 193 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", 194 rsbp->vs_version); 195 goto out; 196 } 197 198#ifdef DIAGNOSTIC 199 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version); 200 printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize); 201#endif 202 203 sbp->s_magic = rsbp->vs_magic; 204 sbp->s_fs_info = infp; 205 206 infp->vsi_raw = rsbp; 207 infp->vsi_bp = bp; 208 infp->vsi_oltext = rsbp->vs_oltext[0]; 209 infp->vsi_oltsize = rsbp->vs_oltsize; 210 211 if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) { 212 printk(KERN_WARNING "vxfs: unable to set final block size\n"); 213 goto out; 214 } 215 216 if (vxfs_read_olt(sbp, bsize)) { 217 printk(KERN_WARNING "vxfs: unable to read olt\n"); 218 goto out; 219 } 220 221 if (vxfs_read_fshead(sbp)) { 222 printk(KERN_WARNING "vxfs: unable to read fshead\n"); 223 goto out; 224 } 225 226 sbp->s_op = &vxfs_super_ops; 227 root = vxfs_iget(sbp, VXFS_ROOT_INO); 228 if (IS_ERR(root)) { 229 ret = PTR_ERR(root); 230 goto out; 231 } 232 sbp->s_root = d_alloc_root(root); 233 if (!sbp->s_root) { 234 iput(root); 235 printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); 236 goto out_free_ilist; 237 } 238 239 return 0; 240 241out_free_ilist: 242 vxfs_put_fake_inode(infp->vsi_fship); 243 vxfs_put_fake_inode(infp->vsi_ilist); 244 vxfs_put_fake_inode(infp->vsi_stilist); 245out: 246 brelse(bp); 247 kfree(infp); 248 return ret; 249} 250 251/* 252 * The usual module blurb. 253 */ 254static int vxfs_get_sb(struct file_system_type *fs_type, 255 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 256{ 257 return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super, 258 mnt); 259} 260 261static struct file_system_type vxfs_fs_type = { 262 .owner = THIS_MODULE, 263 .name = "vxfs", 264 .get_sb = vxfs_get_sb, 265 .kill_sb = kill_block_super, 266 .fs_flags = FS_REQUIRES_DEV, 267}; 268 269static int __init 270vxfs_init(void) 271{ 272 int rv; 273 274 vxfs_inode_cachep = kmem_cache_create("vxfs_inode", 275 sizeof(struct vxfs_inode_info), 0, 276 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL); 277 if (!vxfs_inode_cachep) 278 return -ENOMEM; 279 rv = register_filesystem(&vxfs_fs_type); 280 if (rv < 0) 281 kmem_cache_destroy(vxfs_inode_cachep); 282 return rv; 283} 284 285static void __exit 286vxfs_cleanup(void) 287{ 288 unregister_filesystem(&vxfs_fs_type); 289 kmem_cache_destroy(vxfs_inode_cachep); 290} 291 292module_init(vxfs_init); 293module_exit(vxfs_cleanup); 294