Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * QNX4 file system, Linux implementation. |
| 3 | * |
| 4 | * Version : 0.2.1 |
| 5 | * |
| 6 | * Using parts of the xiafs filesystem. |
| 7 | * |
| 8 | * History : |
| 9 | * |
| 10 | * 01-06-1998 by Richard Frowijn : first release. |
| 11 | * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc. |
| 12 | * 30-06-1998 by Frank Denis : first step to write inodes. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/qnx4_fs.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/highuid.h> |
| 25 | #include <linux/smp_lock.h> |
| 26 | #include <linux/pagemap.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include <linux/vfs.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | |
| 31 | #define QNX4_VERSION 4 |
| 32 | #define QNX4_BMNAME ".bitmap" |
| 33 | |
| 34 | static struct super_operations qnx4_sops; |
| 35 | |
| 36 | #ifdef CONFIG_QNX4FS_RW |
| 37 | |
| 38 | int qnx4_sync_inode(struct inode *inode) |
| 39 | { |
| 40 | int err = 0; |
| 41 | # if 0 |
| 42 | struct buffer_head *bh; |
| 43 | |
| 44 | bh = qnx4_update_inode(inode); |
| 45 | if (bh && buffer_dirty(bh)) |
| 46 | { |
| 47 | sync_dirty_buffer(bh); |
| 48 | if (buffer_req(bh) && !buffer_uptodate(bh)) |
| 49 | { |
| 50 | printk ("IO error syncing qnx4 inode [%s:%08lx]\n", |
| 51 | inode->i_sb->s_id, inode->i_ino); |
| 52 | err = -1; |
| 53 | } |
| 54 | brelse (bh); |
| 55 | } else if (!bh) { |
| 56 | err = -1; |
| 57 | } |
| 58 | # endif |
| 59 | |
| 60 | return err; |
| 61 | } |
| 62 | |
| 63 | static void qnx4_delete_inode(struct inode *inode) |
| 64 | { |
| 65 | QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino)); |
| 66 | inode->i_size = 0; |
| 67 | qnx4_truncate(inode); |
| 68 | lock_kernel(); |
| 69 | qnx4_free_inode(inode); |
| 70 | unlock_kernel(); |
| 71 | } |
| 72 | |
| 73 | static void qnx4_write_super(struct super_block *sb) |
| 74 | { |
| 75 | lock_kernel(); |
| 76 | QNX4DEBUG(("qnx4: write_super\n")); |
| 77 | sb->s_dirt = 0; |
| 78 | unlock_kernel(); |
| 79 | } |
| 80 | |
| 81 | static int qnx4_write_inode(struct inode *inode, int unused) |
| 82 | { |
| 83 | struct qnx4_inode_entry *raw_inode; |
| 84 | int block, ino; |
| 85 | struct buffer_head *bh; |
| 86 | ino = inode->i_ino; |
| 87 | |
| 88 | QNX4DEBUG(("qnx4: write inode 1.\n")); |
| 89 | if (inode->i_nlink == 0) { |
| 90 | return 0; |
| 91 | } |
| 92 | if (!ino) { |
| 93 | printk("qnx4: bad inode number on dev %s: %d is out of range\n", |
| 94 | inode->i_sb->s_id, ino); |
| 95 | return -EIO; |
| 96 | } |
| 97 | QNX4DEBUG(("qnx4: write inode 2.\n")); |
| 98 | block = ino / QNX4_INODES_PER_BLOCK; |
| 99 | lock_kernel(); |
| 100 | if (!(bh = sb_bread(inode->i_sb, block))) { |
| 101 | printk("qnx4: major problem: unable to read inode from dev " |
| 102 | "%s\n", inode->i_sb->s_id); |
| 103 | unlock_kernel(); |
| 104 | return -EIO; |
| 105 | } |
| 106 | raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + |
| 107 | (ino % QNX4_INODES_PER_BLOCK); |
| 108 | raw_inode->di_mode = cpu_to_le16(inode->i_mode); |
| 109 | raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid)); |
| 110 | raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid)); |
| 111 | raw_inode->di_nlink = cpu_to_le16(inode->i_nlink); |
| 112 | raw_inode->di_size = cpu_to_le32(inode->i_size); |
| 113 | raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
| 114 | raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec); |
| 115 | raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
| 116 | raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks); |
| 117 | mark_buffer_dirty(bh); |
| 118 | brelse(bh); |
| 119 | unlock_kernel(); |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | #endif |
| 124 | |
| 125 | static void qnx4_put_super(struct super_block *sb); |
| 126 | static struct inode *qnx4_alloc_inode(struct super_block *sb); |
| 127 | static void qnx4_destroy_inode(struct inode *inode); |
| 128 | static void qnx4_read_inode(struct inode *); |
| 129 | static int qnx4_remount(struct super_block *sb, int *flags, char *data); |
| 130 | static int qnx4_statfs(struct super_block *, struct kstatfs *); |
| 131 | |
| 132 | static struct super_operations qnx4_sops = |
| 133 | { |
| 134 | .alloc_inode = qnx4_alloc_inode, |
| 135 | .destroy_inode = qnx4_destroy_inode, |
| 136 | .read_inode = qnx4_read_inode, |
| 137 | .put_super = qnx4_put_super, |
| 138 | .statfs = qnx4_statfs, |
| 139 | .remount_fs = qnx4_remount, |
| 140 | #ifdef CONFIG_QNX4FS_RW |
| 141 | .write_inode = qnx4_write_inode, |
| 142 | .delete_inode = qnx4_delete_inode, |
| 143 | .write_super = qnx4_write_super, |
| 144 | #endif |
| 145 | }; |
| 146 | |
| 147 | static int qnx4_remount(struct super_block *sb, int *flags, char *data) |
| 148 | { |
| 149 | struct qnx4_sb_info *qs; |
| 150 | |
| 151 | qs = qnx4_sb(sb); |
| 152 | qs->Version = QNX4_VERSION; |
| 153 | #ifndef CONFIG_QNX4FS_RW |
| 154 | *flags |= MS_RDONLY; |
| 155 | #endif |
| 156 | if (*flags & MS_RDONLY) { |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | mark_buffer_dirty(qs->sb_buf); |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static struct buffer_head *qnx4_getblk(struct inode *inode, int nr, |
| 166 | int create) |
| 167 | { |
| 168 | struct buffer_head *result = NULL; |
| 169 | |
| 170 | if ( nr >= 0 ) |
| 171 | nr = qnx4_block_map( inode, nr ); |
| 172 | if (nr) { |
| 173 | result = sb_getblk(inode->i_sb, nr); |
| 174 | return result; |
| 175 | } |
| 176 | if (!create) { |
| 177 | return NULL; |
| 178 | } |
| 179 | #if 0 |
| 180 | tmp = qnx4_new_block(inode->i_sb); |
| 181 | if (!tmp) { |
| 182 | return NULL; |
| 183 | } |
| 184 | result = sb_getblk(inode->i_sb, tmp); |
| 185 | if (tst) { |
| 186 | qnx4_free_block(inode->i_sb, tmp); |
| 187 | brelse(result); |
| 188 | goto repeat; |
| 189 | } |
| 190 | tst = tmp; |
| 191 | #endif |
| 192 | inode->i_ctime = CURRENT_TIME_SEC; |
| 193 | mark_inode_dirty(inode); |
| 194 | return result; |
| 195 | } |
| 196 | |
| 197 | struct buffer_head *qnx4_bread(struct inode *inode, int block, int create) |
| 198 | { |
| 199 | struct buffer_head *bh; |
| 200 | |
| 201 | bh = qnx4_getblk(inode, block, create); |
| 202 | if (!bh || buffer_uptodate(bh)) { |
| 203 | return bh; |
| 204 | } |
| 205 | ll_rw_block(READ, 1, &bh); |
| 206 | wait_on_buffer(bh); |
| 207 | if (buffer_uptodate(bh)) { |
| 208 | return bh; |
| 209 | } |
| 210 | brelse(bh); |
| 211 | |
| 212 | return NULL; |
| 213 | } |
| 214 | |
| 215 | static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create ) |
| 216 | { |
| 217 | unsigned long phys; |
| 218 | |
| 219 | QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock)); |
| 220 | |
| 221 | phys = qnx4_block_map( inode, iblock ); |
| 222 | if ( phys ) { |
| 223 | // logical block is before EOF |
| 224 | map_bh(bh, inode->i_sb, phys); |
| 225 | } else if ( create ) { |
| 226 | // to be done. |
| 227 | } |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | unsigned long qnx4_block_map( struct inode *inode, long iblock ) |
| 232 | { |
| 233 | int ix; |
| 234 | long offset, i_xblk; |
| 235 | unsigned long block = 0; |
| 236 | struct buffer_head *bh = NULL; |
| 237 | struct qnx4_xblk *xblk = NULL; |
| 238 | struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); |
| 239 | qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); |
| 240 | |
| 241 | if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) { |
| 242 | // iblock is in the first extent. This is easy. |
| 243 | block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1; |
| 244 | } else { |
| 245 | // iblock is beyond first extent. We have to follow the extent chain. |
| 246 | i_xblk = le32_to_cpu(qnx4_inode->di_xblk); |
| 247 | offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size); |
| 248 | ix = 0; |
| 249 | while ( --nxtnt > 0 ) { |
| 250 | if ( ix == 0 ) { |
| 251 | // read next xtnt block. |
| 252 | bh = sb_bread(inode->i_sb, i_xblk - 1); |
| 253 | if ( !bh ) { |
| 254 | QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1)); |
| 255 | return -EIO; |
| 256 | } |
| 257 | xblk = (struct qnx4_xblk*)bh->b_data; |
| 258 | if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) { |
| 259 | QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk)); |
| 260 | return -EIO; |
| 261 | } |
| 262 | } |
| 263 | if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) { |
| 264 | // got it! |
| 265 | block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1; |
| 266 | break; |
| 267 | } |
| 268 | offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size); |
| 269 | if ( ++ix >= xblk->xblk_num_xtnts ) { |
| 270 | i_xblk = le32_to_cpu(xblk->xblk_next_xblk); |
| 271 | ix = 0; |
| 272 | brelse( bh ); |
| 273 | bh = NULL; |
| 274 | } |
| 275 | } |
| 276 | if ( bh ) |
| 277 | brelse( bh ); |
| 278 | } |
| 279 | |
| 280 | QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block)); |
| 281 | return block; |
| 282 | } |
| 283 | |
| 284 | static int qnx4_statfs(struct super_block *sb, struct kstatfs *buf) |
| 285 | { |
| 286 | lock_kernel(); |
| 287 | |
| 288 | buf->f_type = sb->s_magic; |
| 289 | buf->f_bsize = sb->s_blocksize; |
| 290 | buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; |
| 291 | buf->f_bfree = qnx4_count_free_blocks(sb); |
| 292 | buf->f_bavail = buf->f_bfree; |
| 293 | buf->f_namelen = QNX4_NAME_MAX; |
| 294 | |
| 295 | unlock_kernel(); |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Check the root directory of the filesystem to make sure |
| 302 | * it really _is_ a qnx4 filesystem, and to check the size |
| 303 | * of the directory entry. |
| 304 | */ |
| 305 | static const char *qnx4_checkroot(struct super_block *sb) |
| 306 | { |
| 307 | struct buffer_head *bh; |
| 308 | struct qnx4_inode_entry *rootdir; |
| 309 | int rd, rl; |
| 310 | int i, j; |
| 311 | int found = 0; |
| 312 | |
| 313 | if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') { |
| 314 | return "no qnx4 filesystem (no root dir)."; |
| 315 | } else { |
| 316 | QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id)); |
| 317 | rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1; |
| 318 | rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size); |
| 319 | for (j = 0; j < rl; j++) { |
| 320 | bh = sb_bread(sb, rd + j); /* root dir, first block */ |
| 321 | if (bh == NULL) { |
| 322 | return "unable to read root entry."; |
| 323 | } |
| 324 | for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) { |
| 325 | rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE); |
| 326 | if (rootdir->di_fname != NULL) { |
| 327 | QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname)); |
| 328 | if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) { |
| 329 | found = 1; |
| 330 | qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL ); |
| 331 | if (!qnx4_sb(sb)->BitMap) { |
| 332 | brelse (bh); |
| 333 | return "not enough memory for bitmap inode"; |
| 334 | } |
| 335 | memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */ |
| 336 | break; |
| 337 | } |
| 338 | } |
| 339 | } |
| 340 | brelse(bh); |
| 341 | if (found != 0) { |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | if (found == 0) { |
| 346 | return "bitmap file not found."; |
| 347 | } |
| 348 | } |
| 349 | return NULL; |
| 350 | } |
| 351 | |
| 352 | static int qnx4_fill_super(struct super_block *s, void *data, int silent) |
| 353 | { |
| 354 | struct buffer_head *bh; |
| 355 | struct inode *root; |
| 356 | const char *errmsg; |
| 357 | struct qnx4_sb_info *qs; |
| 358 | |
| 359 | qs = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); |
| 360 | if (!qs) |
| 361 | return -ENOMEM; |
| 362 | s->s_fs_info = qs; |
| 363 | memset(qs, 0, sizeof(struct qnx4_sb_info)); |
| 364 | |
| 365 | sb_set_blocksize(s, QNX4_BLOCK_SIZE); |
| 366 | |
| 367 | /* Check the superblock signature. Since the qnx4 code is |
| 368 | dangerous, we should leave as quickly as possible |
| 369 | if we don't belong here... */ |
| 370 | bh = sb_bread(s, 1); |
| 371 | if (!bh) { |
| 372 | printk("qnx4: unable to read the superblock\n"); |
| 373 | goto outnobh; |
| 374 | } |
| 375 | if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) { |
| 376 | if (!silent) |
| 377 | printk("qnx4: wrong fsid in superblock.\n"); |
| 378 | goto out; |
| 379 | } |
| 380 | s->s_op = &qnx4_sops; |
| 381 | s->s_magic = QNX4_SUPER_MAGIC; |
| 382 | #ifndef CONFIG_QNX4FS_RW |
| 383 | s->s_flags |= MS_RDONLY; /* Yup, read-only yet */ |
| 384 | #endif |
| 385 | qnx4_sb(s)->sb_buf = bh; |
| 386 | qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data; |
| 387 | |
| 388 | |
| 389 | /* check before allocating dentries, inodes, .. */ |
| 390 | errmsg = qnx4_checkroot(s); |
| 391 | if (errmsg != NULL) { |
| 392 | if (!silent) |
| 393 | printk("qnx4: %s\n", errmsg); |
| 394 | goto out; |
| 395 | } |
| 396 | |
| 397 | /* does root not have inode number QNX4_ROOT_INO ?? */ |
| 398 | root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK); |
| 399 | if (!root) { |
| 400 | printk("qnx4: get inode failed\n"); |
| 401 | goto out; |
| 402 | } |
| 403 | |
| 404 | s->s_root = d_alloc_root(root); |
| 405 | if (s->s_root == NULL) |
| 406 | goto outi; |
| 407 | |
| 408 | brelse(bh); |
| 409 | |
| 410 | return 0; |
| 411 | |
| 412 | outi: |
| 413 | iput(root); |
| 414 | out: |
| 415 | brelse(bh); |
| 416 | outnobh: |
| 417 | kfree(qs); |
| 418 | s->s_fs_info = NULL; |
| 419 | return -EINVAL; |
| 420 | } |
| 421 | |
| 422 | static void qnx4_put_super(struct super_block *sb) |
| 423 | { |
| 424 | struct qnx4_sb_info *qs = qnx4_sb(sb); |
| 425 | kfree( qs->BitMap ); |
| 426 | kfree( qs ); |
| 427 | sb->s_fs_info = NULL; |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | static int qnx4_writepage(struct page *page, struct writeback_control *wbc) |
| 432 | { |
| 433 | return block_write_full_page(page,qnx4_get_block, wbc); |
| 434 | } |
| 435 | static int qnx4_readpage(struct file *file, struct page *page) |
| 436 | { |
| 437 | return block_read_full_page(page,qnx4_get_block); |
| 438 | } |
| 439 | static int qnx4_prepare_write(struct file *file, struct page *page, |
| 440 | unsigned from, unsigned to) |
| 441 | { |
| 442 | struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host); |
| 443 | return cont_prepare_write(page, from, to, qnx4_get_block, |
| 444 | &qnx4_inode->mmu_private); |
| 445 | } |
| 446 | static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) |
| 447 | { |
| 448 | return generic_block_bmap(mapping,block,qnx4_get_block); |
| 449 | } |
| 450 | static struct address_space_operations qnx4_aops = { |
| 451 | .readpage = qnx4_readpage, |
| 452 | .writepage = qnx4_writepage, |
| 453 | .sync_page = block_sync_page, |
| 454 | .prepare_write = qnx4_prepare_write, |
| 455 | .commit_write = generic_commit_write, |
| 456 | .bmap = qnx4_bmap |
| 457 | }; |
| 458 | |
| 459 | static void qnx4_read_inode(struct inode *inode) |
| 460 | { |
| 461 | struct buffer_head *bh; |
| 462 | struct qnx4_inode_entry *raw_inode; |
| 463 | int block, ino; |
| 464 | struct super_block *sb = inode->i_sb; |
| 465 | struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); |
| 466 | |
| 467 | ino = inode->i_ino; |
| 468 | inode->i_mode = 0; |
| 469 | |
| 470 | QNX4DEBUG(("Reading inode : [%d]\n", ino)); |
| 471 | if (!ino) { |
| 472 | printk("qnx4: bad inode number on dev %s: %d is out of range\n", |
| 473 | sb->s_id, ino); |
| 474 | return; |
| 475 | } |
| 476 | block = ino / QNX4_INODES_PER_BLOCK; |
| 477 | |
| 478 | if (!(bh = sb_bread(sb, block))) { |
| 479 | printk("qnx4: major problem: unable to read inode from dev " |
| 480 | "%s\n", sb->s_id); |
| 481 | return; |
| 482 | } |
| 483 | raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + |
| 484 | (ino % QNX4_INODES_PER_BLOCK); |
| 485 | |
| 486 | inode->i_mode = le16_to_cpu(raw_inode->di_mode); |
| 487 | inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid); |
| 488 | inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid); |
| 489 | inode->i_nlink = le16_to_cpu(raw_inode->di_nlink); |
| 490 | inode->i_size = le32_to_cpu(raw_inode->di_size); |
| 491 | inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime); |
| 492 | inode->i_mtime.tv_nsec = 0; |
| 493 | inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime); |
| 494 | inode->i_atime.tv_nsec = 0; |
| 495 | inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime); |
| 496 | inode->i_ctime.tv_nsec = 0; |
| 497 | inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size); |
| 498 | inode->i_blksize = QNX4_DIR_ENTRY_SIZE; |
| 499 | |
| 500 | memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE); |
| 501 | if (S_ISREG(inode->i_mode)) { |
| 502 | inode->i_op = &qnx4_file_inode_operations; |
| 503 | inode->i_fop = &qnx4_file_operations; |
| 504 | inode->i_mapping->a_ops = &qnx4_aops; |
| 505 | qnx4_i(inode)->mmu_private = inode->i_size; |
| 506 | } else if (S_ISDIR(inode->i_mode)) { |
| 507 | inode->i_op = &qnx4_dir_inode_operations; |
| 508 | inode->i_fop = &qnx4_dir_operations; |
| 509 | } else if (S_ISLNK(inode->i_mode)) { |
| 510 | inode->i_op = &page_symlink_inode_operations; |
| 511 | inode->i_mapping->a_ops = &qnx4_aops; |
| 512 | qnx4_i(inode)->mmu_private = inode->i_size; |
| 513 | } else |
| 514 | printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id); |
| 515 | brelse(bh); |
| 516 | } |
| 517 | |
| 518 | static kmem_cache_t *qnx4_inode_cachep; |
| 519 | |
| 520 | static struct inode *qnx4_alloc_inode(struct super_block *sb) |
| 521 | { |
| 522 | struct qnx4_inode_info *ei; |
| 523 | ei = kmem_cache_alloc(qnx4_inode_cachep, SLAB_KERNEL); |
| 524 | if (!ei) |
| 525 | return NULL; |
| 526 | return &ei->vfs_inode; |
| 527 | } |
| 528 | |
| 529 | static void qnx4_destroy_inode(struct inode *inode) |
| 530 | { |
| 531 | kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); |
| 532 | } |
| 533 | |
| 534 | static void init_once(void *foo, kmem_cache_t * cachep, |
| 535 | unsigned long flags) |
| 536 | { |
| 537 | struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; |
| 538 | |
| 539 | if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == |
| 540 | SLAB_CTOR_CONSTRUCTOR) |
| 541 | inode_init_once(&ei->vfs_inode); |
| 542 | } |
| 543 | |
| 544 | static int init_inodecache(void) |
| 545 | { |
| 546 | qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", |
| 547 | sizeof(struct qnx4_inode_info), |
| 548 | 0, SLAB_RECLAIM_ACCOUNT, |
| 549 | init_once, NULL); |
| 550 | if (qnx4_inode_cachep == NULL) |
| 551 | return -ENOMEM; |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static void destroy_inodecache(void) |
| 556 | { |
| 557 | if (kmem_cache_destroy(qnx4_inode_cachep)) |
| 558 | printk(KERN_INFO |
| 559 | "qnx4_inode_cache: not all structures were freed\n"); |
| 560 | } |
| 561 | |
| 562 | static struct super_block *qnx4_get_sb(struct file_system_type *fs_type, |
| 563 | int flags, const char *dev_name, void *data) |
| 564 | { |
| 565 | return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super); |
| 566 | } |
| 567 | |
| 568 | static struct file_system_type qnx4_fs_type = { |
| 569 | .owner = THIS_MODULE, |
| 570 | .name = "qnx4", |
| 571 | .get_sb = qnx4_get_sb, |
| 572 | .kill_sb = kill_block_super, |
| 573 | .fs_flags = FS_REQUIRES_DEV, |
| 574 | }; |
| 575 | |
| 576 | static int __init init_qnx4_fs(void) |
| 577 | { |
| 578 | int err; |
| 579 | |
| 580 | err = init_inodecache(); |
| 581 | if (err) |
| 582 | return err; |
| 583 | |
| 584 | err = register_filesystem(&qnx4_fs_type); |
| 585 | if (err) { |
| 586 | destroy_inodecache(); |
| 587 | return err; |
| 588 | } |
| 589 | |
| 590 | printk("QNX4 filesystem 0.2.3 registered.\n"); |
| 591 | return 0; |
| 592 | } |
| 593 | |
| 594 | static void __exit exit_qnx4_fs(void) |
| 595 | { |
| 596 | unregister_filesystem(&qnx4_fs_type); |
| 597 | destroy_inodecache(); |
| 598 | } |
| 599 | |
| 600 | module_init(init_qnx4_fs) |
| 601 | module_exit(exit_qnx4_fs) |
| 602 | MODULE_LICENSE("GPL"); |
| 603 | |