1 /* 2 * Copyright (c) 2000-2001 Christoph Hellwig. 3 * Copyright (c) 2016 Krzysztof Blaszkowski 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer, 11 * without modification. 12 * 2. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * Alternatively, this software may be distributed under the terms of the 16 * GNU General Public License ("GPL"). 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * Veritas filesystem driver - superblock related routines. 33 */ 34 #include <linux/init.h> 35 #include <linux/module.h> 36 37 #include <linux/blkdev.h> 38 #include <linux/fs.h> 39 #include <linux/buffer_head.h> 40 #include <linux/kernel.h> 41 #include <linux/slab.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 52 MODULE_AUTHOR("Christoph Hellwig, Krzysztof Blaszkowski"); 53 MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver"); 54 MODULE_LICENSE("Dual BSD/GPL"); 55 56 static struct kmem_cache *vxfs_inode_cachep; 57 58 /** 59 * vxfs_put_super - free superblock resources 60 * @sbp: VFS superblock. 61 * 62 * Description: 63 * vxfs_put_super frees all resources allocated for @sbp 64 * after the last instance of the filesystem is unmounted. 65 */ 66 67 static void 68 vxfs_put_super(struct super_block *sbp) 69 { 70 struct vxfs_sb_info *infp = VXFS_SBI(sbp); 71 72 iput(infp->vsi_fship); 73 iput(infp->vsi_ilist); 74 iput(infp->vsi_stilist); 75 76 brelse(infp->vsi_bp); 77 kfree(infp); 78 } 79 80 /** 81 * vxfs_statfs - get filesystem information 82 * @dentry: VFS dentry to locate superblock 83 * @bufp: output buffer 84 * 85 * Description: 86 * vxfs_statfs fills the statfs buffer @bufp with information 87 * about the filesystem described by @dentry. 88 * 89 * Returns: 90 * Zero. 91 * 92 * Locking: 93 * No locks held. 94 * 95 * Notes: 96 * This is everything but complete... 97 */ 98 static int 99 vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp) 100 { 101 struct vxfs_sb_info *infp = VXFS_SBI(dentry->d_sb); 102 struct vxfs_sb *raw_sb = infp->vsi_raw; 103 104 bufp->f_type = VXFS_SUPER_MAGIC; 105 bufp->f_bsize = dentry->d_sb->s_blocksize; 106 bufp->f_blocks = fs32_to_cpu(infp, raw_sb->vs_dsize); 107 bufp->f_bfree = fs32_to_cpu(infp, raw_sb->vs_free); 108 bufp->f_bavail = 0; 109 bufp->f_files = 0; 110 bufp->f_ffree = fs32_to_cpu(infp, raw_sb->vs_ifree); 111 bufp->f_namelen = VXFS_NAMELEN; 112 113 return 0; 114 } 115 116 static int vxfs_remount(struct super_block *sb, int *flags, char *data) 117 { 118 sync_filesystem(sb); 119 *flags |= SB_RDONLY; 120 return 0; 121 } 122 123 static struct inode *vxfs_alloc_inode(struct super_block *sb) 124 { 125 struct vxfs_inode_info *vi; 126 127 vi = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL); 128 if (!vi) 129 return NULL; 130 inode_init_once(&vi->vfs_inode); 131 return &vi->vfs_inode; 132 } 133 134 static void vxfs_free_inode(struct inode *inode) 135 { 136 kmem_cache_free(vxfs_inode_cachep, VXFS_INO(inode)); 137 } 138 139 static const struct super_operations vxfs_super_ops = { 140 .alloc_inode = vxfs_alloc_inode, 141 .free_inode = vxfs_free_inode, 142 .evict_inode = vxfs_evict_inode, 143 .put_super = vxfs_put_super, 144 .statfs = vxfs_statfs, 145 .remount_fs = vxfs_remount, 146 }; 147 148 static int vxfs_try_sb_magic(struct super_block *sbp, int silent, 149 unsigned blk, __fs32 magic) 150 { 151 struct buffer_head *bp; 152 struct vxfs_sb *rsbp; 153 struct vxfs_sb_info *infp = VXFS_SBI(sbp); 154 int rc = -ENOMEM; 155 156 bp = sb_bread(sbp, blk); 157 do { 158 if (!bp || !buffer_mapped(bp)) { 159 if (!silent) { 160 printk(KERN_WARNING 161 "vxfs: unable to read disk superblock at %u\n", 162 blk); 163 } 164 break; 165 } 166 167 rc = -EINVAL; 168 rsbp = (struct vxfs_sb *)bp->b_data; 169 if (rsbp->vs_magic != magic) { 170 if (!silent) 171 printk(KERN_NOTICE 172 "vxfs: WRONG superblock magic %08x at %u\n", 173 rsbp->vs_magic, blk); 174 break; 175 } 176 177 rc = 0; 178 infp->vsi_raw = rsbp; 179 infp->vsi_bp = bp; 180 } while (0); 181 182 if (rc) { 183 infp->vsi_raw = NULL; 184 infp->vsi_bp = NULL; 185 brelse(bp); 186 } 187 188 return rc; 189 } 190 191 /** 192 * vxfs_read_super - read superblock into memory and initialize filesystem 193 * @sbp: VFS superblock (to fill) 194 * @dp: fs private mount data 195 * @silent: do not complain loudly when sth is wrong 196 * 197 * Description: 198 * We are called on the first mount of a filesystem to read the 199 * superblock into memory and do some basic setup. 200 * 201 * Returns: 202 * The superblock on success, else %NULL. 203 * 204 * Locking: 205 * We are under @sbp->s_lock. 206 */ 207 static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent) 208 { 209 struct vxfs_sb_info *infp; 210 struct vxfs_sb *rsbp; 211 u_long bsize; 212 struct inode *root; 213 int ret = -EINVAL; 214 u32 j; 215 216 sbp->s_flags |= SB_RDONLY; 217 218 infp = kzalloc(sizeof(*infp), GFP_KERNEL); 219 if (!infp) { 220 printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n"); 221 return -ENOMEM; 222 } 223 224 bsize = sb_min_blocksize(sbp, BLOCK_SIZE); 225 if (!bsize) { 226 printk(KERN_WARNING "vxfs: unable to set blocksize\n"); 227 goto out; 228 } 229 230 sbp->s_op = &vxfs_super_ops; 231 sbp->s_fs_info = infp; 232 233 if (!vxfs_try_sb_magic(sbp, silent, 1, 234 (__force __fs32)cpu_to_le32(VXFS_SUPER_MAGIC))) { 235 /* Unixware, x86 */ 236 infp->byte_order = VXFS_BO_LE; 237 } else if (!vxfs_try_sb_magic(sbp, silent, 8, 238 (__force __fs32)cpu_to_be32(VXFS_SUPER_MAGIC))) { 239 /* HP-UX, parisc */ 240 infp->byte_order = VXFS_BO_BE; 241 } else { 242 if (!silent) 243 printk(KERN_NOTICE "vxfs: can't find superblock.\n"); 244 goto out; 245 } 246 247 rsbp = infp->vsi_raw; 248 j = fs32_to_cpu(infp, rsbp->vs_version); 249 if ((j < 2 || j > 4) && !silent) { 250 printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n", j); 251 goto out; 252 } 253 254 #ifdef DIAGNOSTIC 255 printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", j); 256 printk(KERN_DEBUG "vxfs: blocksize: %d\n", 257 fs32_to_cpu(infp, rsbp->vs_bsize)); 258 #endif 259 260 sbp->s_magic = fs32_to_cpu(infp, rsbp->vs_magic); 261 262 infp->vsi_oltext = fs32_to_cpu(infp, rsbp->vs_oltext[0]); 263 infp->vsi_oltsize = fs32_to_cpu(infp, rsbp->vs_oltsize); 264 265 j = fs32_to_cpu(infp, rsbp->vs_bsize); 266 if (!sb_set_blocksize(sbp, j)) { 267 printk(KERN_WARNING "vxfs: unable to set final block size\n"); 268 goto out; 269 } 270 271 if (vxfs_read_olt(sbp, bsize)) { 272 printk(KERN_WARNING "vxfs: unable to read olt\n"); 273 goto out; 274 } 275 276 if (vxfs_read_fshead(sbp)) { 277 printk(KERN_WARNING "vxfs: unable to read fshead\n"); 278 goto out; 279 } 280 281 root = vxfs_iget(sbp, VXFS_ROOT_INO); 282 if (IS_ERR(root)) { 283 ret = PTR_ERR(root); 284 goto out; 285 } 286 sbp->s_root = d_make_root(root); 287 if (!sbp->s_root) { 288 printk(KERN_WARNING "vxfs: unable to get root dentry.\n"); 289 goto out_free_ilist; 290 } 291 292 return 0; 293 294 out_free_ilist: 295 iput(infp->vsi_fship); 296 iput(infp->vsi_ilist); 297 iput(infp->vsi_stilist); 298 out: 299 brelse(infp->vsi_bp); 300 kfree(infp); 301 return ret; 302 } 303 304 /* 305 * The usual module blurb. 306 */ 307 static struct dentry *vxfs_mount(struct file_system_type *fs_type, 308 int flags, const char *dev_name, void *data) 309 { 310 return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super); 311 } 312 313 static struct file_system_type vxfs_fs_type = { 314 .owner = THIS_MODULE, 315 .name = "vxfs", 316 .mount = vxfs_mount, 317 .kill_sb = kill_block_super, 318 .fs_flags = FS_REQUIRES_DEV, 319 }; 320 MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ 321 MODULE_ALIAS("vxfs"); 322 323 static int __init 324 vxfs_init(void) 325 { 326 int rv; 327 328 vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode", 329 sizeof(struct vxfs_inode_info), 0, 330 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 331 offsetof(struct vxfs_inode_info, vii_immed.vi_immed), 332 sizeof_field(struct vxfs_inode_info, 333 vii_immed.vi_immed), 334 NULL); 335 if (!vxfs_inode_cachep) 336 return -ENOMEM; 337 rv = register_filesystem(&vxfs_fs_type); 338 if (rv < 0) 339 kmem_cache_destroy(vxfs_inode_cachep); 340 return rv; 341 } 342 343 static void __exit 344 vxfs_cleanup(void) 345 { 346 unregister_filesystem(&vxfs_fs_type); 347 /* 348 * Make sure all delayed rcu free inodes are flushed before we 349 * destroy cache. 350 */ 351 rcu_barrier(); 352 kmem_cache_destroy(vxfs_inode_cachep); 353 } 354 355 module_init(vxfs_init); 356 module_exit(vxfs_cleanup); 357