Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Optimized MPEG FS - inode and super operations. |
| 3 | * Copyright (C) 2006 Bob Copeland <me@bobcopeland.com> |
| 4 | * Released under GPL v2. |
| 5 | */ |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 6 | #include <linux/module.h> |
| 7 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 8 | #include <linux/slab.h> |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 9 | #include <linux/fs.h> |
| 10 | #include <linux/vfs.h> |
| 11 | #include <linux/parser.h> |
| 12 | #include <linux/buffer_head.h> |
| 13 | #include <linux/vmalloc.h> |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 14 | #include <linux/writeback.h> |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 15 | #include <linux/crc-itu-t.h> |
| 16 | #include "omfs.h" |
| 17 | |
| 18 | MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>"); |
| 19 | MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux"); |
| 20 | MODULE_LICENSE("GPL"); |
| 21 | |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 22 | struct buffer_head *omfs_bread(struct super_block *sb, sector_t block) |
| 23 | { |
| 24 | struct omfs_sb_info *sbi = OMFS_SB(sb); |
| 25 | if (block >= sbi->s_num_blocks) |
| 26 | return NULL; |
| 27 | |
| 28 | return sb_bread(sb, clus_to_blk(sbi, block)); |
| 29 | } |
| 30 | |
Al Viro | 587228b | 2011-07-24 22:58:10 -0400 | [diff] [blame^] | 31 | struct inode *omfs_new_inode(struct inode *dir, umode_t mode) |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 32 | { |
| 33 | struct inode *inode; |
| 34 | u64 new_block; |
| 35 | int err; |
| 36 | int len; |
| 37 | struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb); |
| 38 | |
| 39 | inode = new_inode(dir->i_sb); |
| 40 | if (!inode) |
| 41 | return ERR_PTR(-ENOMEM); |
| 42 | |
| 43 | err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors, |
| 44 | &new_block, &len); |
| 45 | if (err) |
| 46 | goto fail; |
| 47 | |
| 48 | inode->i_ino = new_block; |
Dmitry Monakhov | 6a9e652 | 2010-03-04 17:32:17 +0300 | [diff] [blame] | 49 | inode_init_owner(inode, NULL, mode); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 50 | inode->i_mapping->a_ops = &omfs_aops; |
| 51 | |
| 52 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 53 | switch (mode & S_IFMT) { |
| 54 | case S_IFDIR: |
| 55 | inode->i_op = &omfs_dir_inops; |
| 56 | inode->i_fop = &omfs_dir_operations; |
| 57 | inode->i_size = sbi->s_sys_blocksize; |
| 58 | inc_nlink(inode); |
| 59 | break; |
| 60 | case S_IFREG: |
| 61 | inode->i_op = &omfs_file_inops; |
| 62 | inode->i_fop = &omfs_file_operations; |
| 63 | inode->i_size = 0; |
| 64 | break; |
| 65 | } |
| 66 | |
| 67 | insert_inode_hash(inode); |
| 68 | mark_inode_dirty(inode); |
| 69 | return inode; |
| 70 | fail: |
| 71 | make_bad_inode(inode); |
| 72 | iput(inode); |
| 73 | return ERR_PTR(err); |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Update the header checksums for a dirty inode based on its contents. |
| 78 | * Caller is expected to hold the buffer head underlying oi and mark it |
| 79 | * dirty. |
| 80 | */ |
| 81 | static void omfs_update_checksums(struct omfs_inode *oi) |
| 82 | { |
| 83 | int xor, i, ofs = 0, count; |
| 84 | u16 crc = 0; |
| 85 | unsigned char *ptr = (unsigned char *) oi; |
| 86 | |
| 87 | count = be32_to_cpu(oi->i_head.h_body_size); |
| 88 | ofs = sizeof(struct omfs_header); |
| 89 | |
| 90 | crc = crc_itu_t(crc, ptr + ofs, count); |
| 91 | oi->i_head.h_crc = cpu_to_be16(crc); |
| 92 | |
| 93 | xor = ptr[0]; |
| 94 | for (i = 1; i < OMFS_XOR_COUNT; i++) |
| 95 | xor ^= ptr[i]; |
| 96 | |
| 97 | oi->i_head.h_check_xor = xor; |
| 98 | } |
| 99 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 100 | static int __omfs_write_inode(struct inode *inode, int wait) |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 101 | { |
| 102 | struct omfs_inode *oi; |
| 103 | struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb); |
| 104 | struct buffer_head *bh, *bh2; |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 105 | u64 ctime; |
| 106 | int i; |
| 107 | int ret = -EIO; |
| 108 | int sync_failed = 0; |
| 109 | |
| 110 | /* get current inode since we may have written sibling ptrs etc. */ |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 111 | bh = omfs_bread(inode->i_sb, inode->i_ino); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 112 | if (!bh) |
| 113 | goto out; |
| 114 | |
| 115 | oi = (struct omfs_inode *) bh->b_data; |
| 116 | |
| 117 | oi->i_head.h_self = cpu_to_be64(inode->i_ino); |
| 118 | if (S_ISDIR(inode->i_mode)) |
| 119 | oi->i_type = OMFS_DIR; |
| 120 | else if (S_ISREG(inode->i_mode)) |
| 121 | oi->i_type = OMFS_FILE; |
| 122 | else { |
| 123 | printk(KERN_WARNING "omfs: unknown file type: %d\n", |
| 124 | inode->i_mode); |
| 125 | goto out_brelse; |
| 126 | } |
| 127 | |
| 128 | oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize - |
| 129 | sizeof(struct omfs_header)); |
| 130 | oi->i_head.h_version = 1; |
| 131 | oi->i_head.h_type = OMFS_INODE_NORMAL; |
| 132 | oi->i_head.h_magic = OMFS_IMAGIC; |
| 133 | oi->i_size = cpu_to_be64(inode->i_size); |
| 134 | |
| 135 | ctime = inode->i_ctime.tv_sec * 1000LL + |
| 136 | ((inode->i_ctime.tv_nsec + 999)/1000); |
| 137 | oi->i_ctime = cpu_to_be64(ctime); |
| 138 | |
| 139 | omfs_update_checksums(oi); |
| 140 | |
| 141 | mark_buffer_dirty(bh); |
| 142 | if (wait) { |
| 143 | sync_dirty_buffer(bh); |
| 144 | if (buffer_req(bh) && !buffer_uptodate(bh)) |
| 145 | sync_failed = 1; |
| 146 | } |
| 147 | |
| 148 | /* if mirroring writes, copy to next fsblock */ |
| 149 | for (i = 1; i < sbi->s_mirrors; i++) { |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 150 | bh2 = omfs_bread(inode->i_sb, inode->i_ino + i); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 151 | if (!bh2) |
| 152 | goto out_brelse; |
| 153 | |
| 154 | memcpy(bh2->b_data, bh->b_data, bh->b_size); |
| 155 | mark_buffer_dirty(bh2); |
| 156 | if (wait) { |
| 157 | sync_dirty_buffer(bh2); |
| 158 | if (buffer_req(bh2) && !buffer_uptodate(bh2)) |
| 159 | sync_failed = 1; |
| 160 | } |
| 161 | brelse(bh2); |
| 162 | } |
| 163 | ret = (sync_failed) ? -EIO : 0; |
| 164 | out_brelse: |
| 165 | brelse(bh); |
| 166 | out: |
| 167 | return ret; |
| 168 | } |
| 169 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 170 | static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 171 | { |
| 172 | return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
| 173 | } |
| 174 | |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 175 | int omfs_sync_inode(struct inode *inode) |
| 176 | { |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 177 | return __omfs_write_inode(inode, 1); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /* |
| 181 | * called when an entry is deleted, need to clear the bits in the |
| 182 | * bitmaps. |
| 183 | */ |
Al Viro | 69c9e75 | 2010-06-06 10:12:01 -0400 | [diff] [blame] | 184 | static void omfs_evict_inode(struct inode *inode) |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 185 | { |
| 186 | truncate_inode_pages(&inode->i_data, 0); |
Al Viro | 69c9e75 | 2010-06-06 10:12:01 -0400 | [diff] [blame] | 187 | end_writeback(inode); |
| 188 | |
| 189 | if (inode->i_nlink) |
| 190 | return; |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 191 | |
| 192 | if (S_ISREG(inode->i_mode)) { |
| 193 | inode->i_size = 0; |
| 194 | omfs_shrink_inode(inode); |
| 195 | } |
| 196 | |
| 197 | omfs_clear_range(inode->i_sb, inode->i_ino, 2); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | struct inode *omfs_iget(struct super_block *sb, ino_t ino) |
| 201 | { |
| 202 | struct omfs_sb_info *sbi = OMFS_SB(sb); |
| 203 | struct omfs_inode *oi; |
| 204 | struct buffer_head *bh; |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 205 | u64 ctime; |
| 206 | unsigned long nsecs; |
| 207 | struct inode *inode; |
| 208 | |
| 209 | inode = iget_locked(sb, ino); |
| 210 | if (!inode) |
| 211 | return ERR_PTR(-ENOMEM); |
| 212 | if (!(inode->i_state & I_NEW)) |
| 213 | return inode; |
| 214 | |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 215 | bh = omfs_bread(inode->i_sb, ino); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 216 | if (!bh) |
| 217 | goto iget_failed; |
| 218 | |
| 219 | oi = (struct omfs_inode *)bh->b_data; |
| 220 | |
| 221 | /* check self */ |
| 222 | if (ino != be64_to_cpu(oi->i_head.h_self)) |
| 223 | goto fail_bh; |
| 224 | |
| 225 | inode->i_uid = sbi->s_uid; |
| 226 | inode->i_gid = sbi->s_gid; |
| 227 | |
| 228 | ctime = be64_to_cpu(oi->i_ctime); |
| 229 | nsecs = do_div(ctime, 1000) * 1000L; |
| 230 | |
| 231 | inode->i_atime.tv_sec = ctime; |
| 232 | inode->i_mtime.tv_sec = ctime; |
| 233 | inode->i_ctime.tv_sec = ctime; |
| 234 | inode->i_atime.tv_nsec = nsecs; |
| 235 | inode->i_mtime.tv_nsec = nsecs; |
| 236 | inode->i_ctime.tv_nsec = nsecs; |
| 237 | |
| 238 | inode->i_mapping->a_ops = &omfs_aops; |
| 239 | |
| 240 | switch (oi->i_type) { |
| 241 | case OMFS_DIR: |
| 242 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask); |
| 243 | inode->i_op = &omfs_dir_inops; |
| 244 | inode->i_fop = &omfs_dir_operations; |
Bob Copeland | c963343 | 2008-08-15 00:40:46 -0700 | [diff] [blame] | 245 | inode->i_size = sbi->s_sys_blocksize; |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 246 | inc_nlink(inode); |
| 247 | break; |
| 248 | case OMFS_FILE: |
| 249 | inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask); |
| 250 | inode->i_fop = &omfs_file_operations; |
| 251 | inode->i_size = be64_to_cpu(oi->i_size); |
| 252 | break; |
| 253 | } |
| 254 | brelse(bh); |
| 255 | unlock_new_inode(inode); |
| 256 | return inode; |
| 257 | fail_bh: |
| 258 | brelse(bh); |
| 259 | iget_failed: |
| 260 | iget_failed(inode); |
| 261 | return ERR_PTR(-EIO); |
| 262 | } |
| 263 | |
| 264 | static void omfs_put_super(struct super_block *sb) |
| 265 | { |
| 266 | struct omfs_sb_info *sbi = OMFS_SB(sb); |
| 267 | kfree(sbi->s_imap); |
| 268 | kfree(sbi); |
| 269 | sb->s_fs_info = NULL; |
| 270 | } |
| 271 | |
| 272 | static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 273 | { |
| 274 | struct super_block *s = dentry->d_sb; |
| 275 | struct omfs_sb_info *sbi = OMFS_SB(s); |
Coly Li | 197e671 | 2009-04-02 16:59:39 -0700 | [diff] [blame] | 276 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
| 277 | |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 278 | buf->f_type = OMFS_MAGIC; |
| 279 | buf->f_bsize = sbi->s_blocksize; |
| 280 | buf->f_blocks = sbi->s_num_blocks; |
| 281 | buf->f_files = sbi->s_num_blocks; |
| 282 | buf->f_namelen = OMFS_NAMELEN; |
Coly Li | 197e671 | 2009-04-02 16:59:39 -0700 | [diff] [blame] | 283 | buf->f_fsid.val[0] = (u32)id; |
| 284 | buf->f_fsid.val[1] = (u32)(id >> 32); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 285 | |
| 286 | buf->f_bfree = buf->f_bavail = buf->f_ffree = |
| 287 | omfs_count_free(s); |
Coly Li | 197e671 | 2009-04-02 16:59:39 -0700 | [diff] [blame] | 288 | |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 289 | return 0; |
| 290 | } |
| 291 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 292 | static const struct super_operations omfs_sops = { |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 293 | .write_inode = omfs_write_inode, |
Al Viro | 69c9e75 | 2010-06-06 10:12:01 -0400 | [diff] [blame] | 294 | .evict_inode = omfs_evict_inode, |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 295 | .put_super = omfs_put_super, |
| 296 | .statfs = omfs_statfs, |
| 297 | .show_options = generic_show_options, |
| 298 | }; |
| 299 | |
| 300 | /* |
| 301 | * For Rio Karma, there is an on-disk free bitmap whose location is |
| 302 | * stored in the root block. For ReplayTV, there is no such free bitmap |
| 303 | * so we have to walk the tree. Both inodes and file data are allocated |
| 304 | * from the same map. This array can be big (300k) so we allocate |
| 305 | * in units of the blocksize. |
| 306 | */ |
| 307 | static int omfs_get_imap(struct super_block *sb) |
| 308 | { |
| 309 | int bitmap_size; |
| 310 | int array_size; |
| 311 | int count; |
| 312 | struct omfs_sb_info *sbi = OMFS_SB(sb); |
| 313 | struct buffer_head *bh; |
| 314 | unsigned long **ptr; |
| 315 | sector_t block; |
| 316 | |
| 317 | bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8); |
| 318 | array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize); |
| 319 | |
| 320 | if (sbi->s_bitmap_ino == ~0ULL) |
| 321 | goto out; |
| 322 | |
| 323 | sbi->s_imap_size = array_size; |
| 324 | sbi->s_imap = kzalloc(array_size * sizeof(unsigned long *), GFP_KERNEL); |
| 325 | if (!sbi->s_imap) |
| 326 | goto nomem; |
| 327 | |
| 328 | block = clus_to_blk(sbi, sbi->s_bitmap_ino); |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 329 | if (block >= sbi->s_num_blocks) |
| 330 | goto nomem; |
| 331 | |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 332 | ptr = sbi->s_imap; |
| 333 | for (count = bitmap_size; count > 0; count -= sb->s_blocksize) { |
| 334 | bh = sb_bread(sb, block++); |
| 335 | if (!bh) |
| 336 | goto nomem_free; |
| 337 | *ptr = kmalloc(sb->s_blocksize, GFP_KERNEL); |
| 338 | if (!*ptr) { |
| 339 | brelse(bh); |
| 340 | goto nomem_free; |
| 341 | } |
| 342 | memcpy(*ptr, bh->b_data, sb->s_blocksize); |
| 343 | if (count < sb->s_blocksize) |
| 344 | memset((void *)*ptr + count, 0xff, |
| 345 | sb->s_blocksize - count); |
| 346 | brelse(bh); |
| 347 | ptr++; |
| 348 | } |
| 349 | out: |
| 350 | return 0; |
| 351 | |
| 352 | nomem_free: |
| 353 | for (count = 0; count < array_size; count++) |
| 354 | kfree(sbi->s_imap[count]); |
| 355 | |
| 356 | kfree(sbi->s_imap); |
| 357 | nomem: |
| 358 | sbi->s_imap = NULL; |
| 359 | sbi->s_imap_size = 0; |
| 360 | return -ENOMEM; |
| 361 | } |
| 362 | |
| 363 | enum { |
| 364 | Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask |
| 365 | }; |
| 366 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 367 | static const match_table_t tokens = { |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 368 | {Opt_uid, "uid=%u"}, |
| 369 | {Opt_gid, "gid=%u"}, |
| 370 | {Opt_umask, "umask=%o"}, |
| 371 | {Opt_dmask, "dmask=%o"}, |
| 372 | {Opt_fmask, "fmask=%o"}, |
| 373 | }; |
| 374 | |
| 375 | static int parse_options(char *options, struct omfs_sb_info *sbi) |
| 376 | { |
| 377 | char *p; |
| 378 | substring_t args[MAX_OPT_ARGS]; |
| 379 | int option; |
| 380 | |
| 381 | if (!options) |
| 382 | return 1; |
| 383 | |
| 384 | while ((p = strsep(&options, ",")) != NULL) { |
| 385 | int token; |
| 386 | if (!*p) |
| 387 | continue; |
| 388 | |
| 389 | token = match_token(p, tokens, args); |
| 390 | switch (token) { |
| 391 | case Opt_uid: |
| 392 | if (match_int(&args[0], &option)) |
| 393 | return 0; |
| 394 | sbi->s_uid = option; |
| 395 | break; |
| 396 | case Opt_gid: |
| 397 | if (match_int(&args[0], &option)) |
| 398 | return 0; |
| 399 | sbi->s_gid = option; |
| 400 | break; |
| 401 | case Opt_umask: |
| 402 | if (match_octal(&args[0], &option)) |
| 403 | return 0; |
| 404 | sbi->s_fmask = sbi->s_dmask = option; |
| 405 | break; |
| 406 | case Opt_dmask: |
| 407 | if (match_octal(&args[0], &option)) |
| 408 | return 0; |
| 409 | sbi->s_dmask = option; |
| 410 | break; |
| 411 | case Opt_fmask: |
| 412 | if (match_octal(&args[0], &option)) |
| 413 | return 0; |
| 414 | sbi->s_fmask = option; |
| 415 | break; |
| 416 | default: |
| 417 | return 0; |
| 418 | } |
| 419 | } |
| 420 | return 1; |
| 421 | } |
| 422 | |
| 423 | static int omfs_fill_super(struct super_block *sb, void *data, int silent) |
| 424 | { |
| 425 | struct buffer_head *bh, *bh2; |
| 426 | struct omfs_super_block *omfs_sb; |
| 427 | struct omfs_root_block *omfs_rb; |
| 428 | struct omfs_sb_info *sbi; |
| 429 | struct inode *root; |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 430 | int ret = -EINVAL; |
| 431 | |
| 432 | save_mount_options(sb, (char *) data); |
| 433 | |
| 434 | sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL); |
| 435 | if (!sbi) |
| 436 | return -ENOMEM; |
| 437 | |
| 438 | sb->s_fs_info = sbi; |
| 439 | |
David Howells | c222d53 | 2008-11-14 10:38:59 +1100 | [diff] [blame] | 440 | sbi->s_uid = current_uid(); |
| 441 | sbi->s_gid = current_gid(); |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 442 | sbi->s_dmask = sbi->s_fmask = current_umask(); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 443 | |
| 444 | if (!parse_options((char *) data, sbi)) |
| 445 | goto end; |
| 446 | |
| 447 | sb->s_maxbytes = 0xffffffff; |
| 448 | |
| 449 | sb_set_blocksize(sb, 0x200); |
| 450 | |
| 451 | bh = sb_bread(sb, 0); |
| 452 | if (!bh) |
| 453 | goto end; |
| 454 | |
| 455 | omfs_sb = (struct omfs_super_block *)bh->b_data; |
| 456 | |
| 457 | if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) { |
| 458 | if (!silent) |
| 459 | printk(KERN_ERR "omfs: Invalid superblock (%x)\n", |
| 460 | omfs_sb->s_magic); |
| 461 | goto out_brelse_bh; |
| 462 | } |
| 463 | sb->s_magic = OMFS_MAGIC; |
| 464 | |
| 465 | sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks); |
| 466 | sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize); |
| 467 | sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors); |
| 468 | sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block); |
| 469 | sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize); |
| 470 | mutex_init(&sbi->s_bitmap_lock); |
| 471 | |
| 472 | if (sbi->s_sys_blocksize > PAGE_SIZE) { |
| 473 | printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n", |
| 474 | sbi->s_sys_blocksize); |
| 475 | goto out_brelse_bh; |
| 476 | } |
| 477 | |
| 478 | if (sbi->s_blocksize < sbi->s_sys_blocksize || |
| 479 | sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) { |
| 480 | printk(KERN_ERR "omfs: block size (%d) is out of range\n", |
| 481 | sbi->s_blocksize); |
| 482 | goto out_brelse_bh; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Use sys_blocksize as the fs block since it is smaller than a |
| 487 | * page while the fs blocksize can be larger. |
| 488 | */ |
| 489 | sb_set_blocksize(sb, sbi->s_sys_blocksize); |
| 490 | |
| 491 | /* |
| 492 | * ...and the difference goes into a shift. sys_blocksize is always |
| 493 | * a power of two factor of blocksize. |
| 494 | */ |
| 495 | sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) - |
| 496 | get_bitmask_order(sbi->s_sys_blocksize); |
| 497 | |
Bob Copeland | f068272 | 2008-09-06 17:51:53 -0400 | [diff] [blame] | 498 | bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block)); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 499 | if (!bh2) |
| 500 | goto out_brelse_bh; |
| 501 | |
| 502 | omfs_rb = (struct omfs_root_block *)bh2->b_data; |
| 503 | |
| 504 | sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap); |
| 505 | sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize); |
| 506 | |
| 507 | if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) { |
| 508 | printk(KERN_ERR "omfs: block count discrepancy between " |
| 509 | "super and root blocks (%llx, %llx)\n", |
Alexander Beregalov | dc60bf1 | 2008-08-05 13:01:33 -0700 | [diff] [blame] | 510 | (unsigned long long)sbi->s_num_blocks, |
| 511 | (unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks)); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 512 | goto out_brelse_bh2; |
| 513 | } |
| 514 | |
Bob Copeland | 9442e54 | 2008-08-14 18:43:59 -0400 | [diff] [blame] | 515 | if (sbi->s_bitmap_ino != ~0ULL && |
| 516 | sbi->s_bitmap_ino > sbi->s_num_blocks) { |
| 517 | printk(KERN_ERR "omfs: free space bitmap location is corrupt " |
| 518 | "(%llx, total blocks %llx)\n", |
| 519 | (unsigned long long) sbi->s_bitmap_ino, |
| 520 | (unsigned long long) sbi->s_num_blocks); |
| 521 | goto out_brelse_bh2; |
| 522 | } |
Bob Copeland | 8800a04 | 2010-07-06 11:16:46 -0400 | [diff] [blame] | 523 | if (sbi->s_clustersize < 1 || |
| 524 | sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) { |
| 525 | printk(KERN_ERR "omfs: cluster size out of range (%d)", |
| 526 | sbi->s_clustersize); |
| 527 | goto out_brelse_bh2; |
| 528 | } |
Bob Copeland | 9442e54 | 2008-08-14 18:43:59 -0400 | [diff] [blame] | 529 | |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 530 | ret = omfs_get_imap(sb); |
| 531 | if (ret) |
| 532 | goto out_brelse_bh2; |
| 533 | |
| 534 | sb->s_op = &omfs_sops; |
| 535 | |
| 536 | root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir)); |
| 537 | if (IS_ERR(root)) { |
| 538 | ret = PTR_ERR(root); |
| 539 | goto out_brelse_bh2; |
| 540 | } |
| 541 | |
| 542 | sb->s_root = d_alloc_root(root); |
| 543 | if (!sb->s_root) { |
| 544 | iput(root); |
| 545 | goto out_brelse_bh2; |
| 546 | } |
| 547 | printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name); |
| 548 | |
| 549 | ret = 0; |
| 550 | out_brelse_bh2: |
| 551 | brelse(bh2); |
| 552 | out_brelse_bh: |
| 553 | brelse(bh); |
| 554 | end: |
Davidlohr Bueso | 70d9e38 | 2010-07-06 00:50:58 -0400 | [diff] [blame] | 555 | if (ret) |
| 556 | kfree(sbi); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 557 | return ret; |
| 558 | } |
| 559 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 560 | static struct dentry *omfs_mount(struct file_system_type *fs_type, |
| 561 | int flags, const char *dev_name, void *data) |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 562 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 563 | return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super); |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | static struct file_system_type omfs_fs_type = { |
| 567 | .owner = THIS_MODULE, |
| 568 | .name = "omfs", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 569 | .mount = omfs_mount, |
Bob Copeland | 555e377 | 2008-07-25 19:45:15 -0700 | [diff] [blame] | 570 | .kill_sb = kill_block_super, |
| 571 | .fs_flags = FS_REQUIRES_DEV, |
| 572 | }; |
| 573 | |
| 574 | static int __init init_omfs_fs(void) |
| 575 | { |
| 576 | return register_filesystem(&omfs_fs_type); |
| 577 | } |
| 578 | |
| 579 | static void __exit exit_omfs_fs(void) |
| 580 | { |
| 581 | unregister_filesystem(&omfs_fs_type); |
| 582 | } |
| 583 | |
| 584 | module_init(init_omfs_fs); |
| 585 | module_exit(exit_omfs_fs); |