Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hfs/inode.c |
| 3 | * |
| 4 | * Copyright (C) 1995-1997 Paul H. Hargrove |
| 5 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| 6 | * This file may be distributed under the terms of the GNU General Public License. |
| 7 | * |
| 8 | * This file contains inode-related functions which do not depend on |
| 9 | * which scheme is being used to represent forks. |
| 10 | * |
| 11 | * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds |
| 12 | */ |
| 13 | |
| 14 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/mpage.h> |
| 16 | |
| 17 | #include "hfs_fs.h" |
| 18 | #include "btree.h" |
| 19 | |
| 20 | static struct file_operations hfs_file_operations; |
| 21 | static struct inode_operations hfs_file_inode_operations; |
| 22 | |
| 23 | /*================ Variable-like macros ================*/ |
| 24 | |
| 25 | #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) |
| 26 | |
| 27 | static int hfs_writepage(struct page *page, struct writeback_control *wbc) |
| 28 | { |
| 29 | return block_write_full_page(page, hfs_get_block, wbc); |
| 30 | } |
| 31 | |
| 32 | static int hfs_readpage(struct file *file, struct page *page) |
| 33 | { |
| 34 | return block_read_full_page(page, hfs_get_block); |
| 35 | } |
| 36 | |
| 37 | static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) |
| 38 | { |
| 39 | return cont_prepare_write(page, from, to, hfs_get_block, |
| 40 | &HFS_I(page->mapping->host)->phys_size); |
| 41 | } |
| 42 | |
| 43 | static sector_t hfs_bmap(struct address_space *mapping, sector_t block) |
| 44 | { |
| 45 | return generic_block_bmap(mapping, block, hfs_get_block); |
| 46 | } |
| 47 | |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 48 | static int hfs_releasepage(struct page *page, gfp_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | struct inode *inode = page->mapping->host; |
| 51 | struct super_block *sb = inode->i_sb; |
| 52 | struct hfs_btree *tree; |
| 53 | struct hfs_bnode *node; |
| 54 | u32 nidx; |
| 55 | int i, res = 1; |
| 56 | |
| 57 | switch (inode->i_ino) { |
| 58 | case HFS_EXT_CNID: |
| 59 | tree = HFS_SB(sb)->ext_tree; |
| 60 | break; |
| 61 | case HFS_CAT_CNID: |
| 62 | tree = HFS_SB(sb)->cat_tree; |
| 63 | break; |
| 64 | default: |
| 65 | BUG(); |
| 66 | return 0; |
| 67 | } |
| 68 | if (tree->node_size >= PAGE_CACHE_SIZE) { |
| 69 | nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); |
| 70 | spin_lock(&tree->hash_lock); |
| 71 | node = hfs_bnode_findhash(tree, nidx); |
| 72 | if (!node) |
| 73 | ; |
| 74 | else if (atomic_read(&node->refcnt)) |
| 75 | res = 0; |
| 76 | if (res && node) { |
| 77 | hfs_bnode_unhash(node); |
| 78 | hfs_bnode_free(node); |
| 79 | } |
| 80 | spin_unlock(&tree->hash_lock); |
| 81 | } else { |
| 82 | nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); |
| 83 | i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); |
| 84 | spin_lock(&tree->hash_lock); |
| 85 | do { |
| 86 | node = hfs_bnode_findhash(tree, nidx++); |
| 87 | if (!node) |
| 88 | continue; |
| 89 | if (atomic_read(&node->refcnt)) { |
| 90 | res = 0; |
| 91 | break; |
| 92 | } |
| 93 | hfs_bnode_unhash(node); |
| 94 | hfs_bnode_free(node); |
| 95 | } while (--i && nidx < tree->node_count); |
| 96 | spin_unlock(&tree->hash_lock); |
| 97 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return res ? try_to_free_buffers(page) : 0; |
| 99 | } |
| 100 | |
| 101 | static int hfs_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks, |
| 102 | struct buffer_head *bh_result, int create) |
| 103 | { |
| 104 | int ret; |
| 105 | |
| 106 | ret = hfs_get_block(inode, iblock, bh_result, create); |
| 107 | if (!ret) |
| 108 | bh_result->b_size = (1 << inode->i_blkbits); |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb, |
| 113 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) |
| 114 | { |
| 115 | struct file *file = iocb->ki_filp; |
| 116 | struct inode *inode = file->f_dentry->d_inode->i_mapping->host; |
| 117 | |
| 118 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
| 119 | offset, nr_segs, hfs_get_blocks, NULL); |
| 120 | } |
| 121 | |
| 122 | static int hfs_writepages(struct address_space *mapping, |
| 123 | struct writeback_control *wbc) |
| 124 | { |
| 125 | return mpage_writepages(mapping, wbc, hfs_get_block); |
| 126 | } |
| 127 | |
| 128 | struct address_space_operations hfs_btree_aops = { |
| 129 | .readpage = hfs_readpage, |
| 130 | .writepage = hfs_writepage, |
| 131 | .sync_page = block_sync_page, |
| 132 | .prepare_write = hfs_prepare_write, |
| 133 | .commit_write = generic_commit_write, |
| 134 | .bmap = hfs_bmap, |
| 135 | .releasepage = hfs_releasepage, |
| 136 | }; |
| 137 | |
| 138 | struct address_space_operations hfs_aops = { |
| 139 | .readpage = hfs_readpage, |
| 140 | .writepage = hfs_writepage, |
| 141 | .sync_page = block_sync_page, |
| 142 | .prepare_write = hfs_prepare_write, |
| 143 | .commit_write = generic_commit_write, |
| 144 | .bmap = hfs_bmap, |
| 145 | .direct_IO = hfs_direct_IO, |
| 146 | .writepages = hfs_writepages, |
| 147 | }; |
| 148 | |
| 149 | /* |
| 150 | * hfs_new_inode |
| 151 | */ |
| 152 | struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode) |
| 153 | { |
| 154 | struct super_block *sb = dir->i_sb; |
| 155 | struct inode *inode = new_inode(sb); |
| 156 | if (!inode) |
| 157 | return NULL; |
| 158 | |
| 159 | init_MUTEX(&HFS_I(inode)->extents_lock); |
| 160 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 161 | hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | inode->i_ino = HFS_SB(sb)->next_id++; |
| 163 | inode->i_mode = mode; |
| 164 | inode->i_uid = current->fsuid; |
| 165 | inode->i_gid = current->fsgid; |
| 166 | inode->i_nlink = 1; |
| 167 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; |
| 168 | inode->i_blksize = HFS_SB(sb)->alloc_blksz; |
| 169 | HFS_I(inode)->flags = 0; |
| 170 | HFS_I(inode)->rsrc_inode = NULL; |
| 171 | HFS_I(inode)->fs_blocks = 0; |
| 172 | if (S_ISDIR(mode)) { |
| 173 | inode->i_size = 2; |
| 174 | HFS_SB(sb)->folder_count++; |
| 175 | if (dir->i_ino == HFS_ROOT_CNID) |
| 176 | HFS_SB(sb)->root_dirs++; |
| 177 | inode->i_op = &hfs_dir_inode_operations; |
| 178 | inode->i_fop = &hfs_dir_operations; |
| 179 | inode->i_mode |= S_IRWXUGO; |
| 180 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; |
| 181 | } else if (S_ISREG(mode)) { |
| 182 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; |
| 183 | HFS_SB(sb)->file_count++; |
| 184 | if (dir->i_ino == HFS_ROOT_CNID) |
| 185 | HFS_SB(sb)->root_files++; |
| 186 | inode->i_op = &hfs_file_inode_operations; |
| 187 | inode->i_fop = &hfs_file_operations; |
| 188 | inode->i_mapping->a_ops = &hfs_aops; |
| 189 | inode->i_mode |= S_IRUGO|S_IXUGO; |
| 190 | if (mode & S_IWUSR) |
| 191 | inode->i_mode |= S_IWUGO; |
| 192 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; |
| 193 | HFS_I(inode)->phys_size = 0; |
| 194 | HFS_I(inode)->alloc_blocks = 0; |
| 195 | HFS_I(inode)->first_blocks = 0; |
| 196 | HFS_I(inode)->cached_start = 0; |
| 197 | HFS_I(inode)->cached_blocks = 0; |
| 198 | memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); |
| 199 | memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); |
| 200 | } |
| 201 | insert_inode_hash(inode); |
| 202 | mark_inode_dirty(inode); |
| 203 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); |
| 204 | sb->s_dirt = 1; |
| 205 | |
| 206 | return inode; |
| 207 | } |
| 208 | |
| 209 | void hfs_delete_inode(struct inode *inode) |
| 210 | { |
| 211 | struct super_block *sb = inode->i_sb; |
| 212 | |
| 213 | dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino); |
| 214 | if (S_ISDIR(inode->i_mode)) { |
| 215 | HFS_SB(sb)->folder_count--; |
| 216 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) |
| 217 | HFS_SB(sb)->root_dirs--; |
| 218 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); |
| 219 | sb->s_dirt = 1; |
| 220 | return; |
| 221 | } |
| 222 | HFS_SB(sb)->file_count--; |
| 223 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) |
| 224 | HFS_SB(sb)->root_files--; |
| 225 | if (S_ISREG(inode->i_mode)) { |
| 226 | if (!inode->i_nlink) { |
| 227 | inode->i_size = 0; |
| 228 | hfs_file_truncate(inode); |
| 229 | } |
| 230 | } |
| 231 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); |
| 232 | sb->s_dirt = 1; |
| 233 | } |
| 234 | |
| 235 | void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, |
| 236 | __be32 __log_size, __be32 phys_size, u32 clump_size) |
| 237 | { |
| 238 | struct super_block *sb = inode->i_sb; |
| 239 | u32 log_size = be32_to_cpu(__log_size); |
| 240 | u16 count; |
| 241 | int i; |
| 242 | |
| 243 | memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); |
| 244 | for (count = 0, i = 0; i < 3; i++) |
| 245 | count += be16_to_cpu(ext[i].count); |
| 246 | HFS_I(inode)->first_blocks = count; |
| 247 | |
| 248 | inode->i_size = HFS_I(inode)->phys_size = log_size; |
| 249 | HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; |
| 250 | inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); |
| 251 | HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / |
| 252 | HFS_SB(sb)->alloc_blksz; |
| 253 | HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; |
| 254 | if (!HFS_I(inode)->clump_blocks) |
| 255 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; |
| 256 | } |
| 257 | |
| 258 | struct hfs_iget_data { |
| 259 | struct hfs_cat_key *key; |
| 260 | hfs_cat_rec *rec; |
| 261 | }; |
| 262 | |
| 263 | static int hfs_test_inode(struct inode *inode, void *data) |
| 264 | { |
| 265 | struct hfs_iget_data *idata = data; |
| 266 | hfs_cat_rec *rec; |
| 267 | |
| 268 | rec = idata->rec; |
| 269 | switch (rec->type) { |
| 270 | case HFS_CDR_DIR: |
| 271 | return inode->i_ino == be32_to_cpu(rec->dir.DirID); |
| 272 | case HFS_CDR_FIL: |
| 273 | return inode->i_ino == be32_to_cpu(rec->file.FlNum); |
| 274 | default: |
| 275 | BUG(); |
| 276 | return 1; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * hfs_read_inode |
| 282 | */ |
| 283 | static int hfs_read_inode(struct inode *inode, void *data) |
| 284 | { |
| 285 | struct hfs_iget_data *idata = data; |
| 286 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); |
| 287 | hfs_cat_rec *rec; |
| 288 | |
| 289 | HFS_I(inode)->flags = 0; |
| 290 | HFS_I(inode)->rsrc_inode = NULL; |
| 291 | init_MUTEX(&HFS_I(inode)->extents_lock); |
| 292 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
| 293 | |
| 294 | /* Initialize the inode */ |
| 295 | inode->i_uid = hsb->s_uid; |
| 296 | inode->i_gid = hsb->s_gid; |
| 297 | inode->i_nlink = 1; |
| 298 | inode->i_blksize = HFS_SB(inode->i_sb)->alloc_blksz; |
| 299 | |
| 300 | if (idata->key) |
| 301 | HFS_I(inode)->cat_key = *idata->key; |
| 302 | else |
| 303 | HFS_I(inode)->flags |= HFS_FLG_RSRC; |
| 304 | HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; |
| 305 | |
| 306 | rec = idata->rec; |
| 307 | switch (rec->type) { |
| 308 | case HFS_CDR_FIL: |
| 309 | if (!HFS_IS_RSRC(inode)) { |
| 310 | hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, |
| 311 | rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); |
| 312 | } else { |
| 313 | hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, |
| 314 | rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); |
| 315 | } |
| 316 | |
| 317 | inode->i_ino = be32_to_cpu(rec->file.FlNum); |
| 318 | inode->i_mode = S_IRUGO | S_IXUGO; |
| 319 | if (!(rec->file.Flags & HFS_FIL_LOCK)) |
| 320 | inode->i_mode |= S_IWUGO; |
| 321 | inode->i_mode &= ~hsb->s_file_umask; |
| 322 | inode->i_mode |= S_IFREG; |
| 323 | inode->i_ctime = inode->i_atime = inode->i_mtime = |
| 324 | hfs_m_to_utime(rec->file.MdDat); |
| 325 | inode->i_op = &hfs_file_inode_operations; |
| 326 | inode->i_fop = &hfs_file_operations; |
| 327 | inode->i_mapping->a_ops = &hfs_aops; |
| 328 | break; |
| 329 | case HFS_CDR_DIR: |
| 330 | inode->i_ino = be32_to_cpu(rec->dir.DirID); |
| 331 | inode->i_size = be16_to_cpu(rec->dir.Val) + 2; |
| 332 | HFS_I(inode)->fs_blocks = 0; |
| 333 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); |
| 334 | inode->i_ctime = inode->i_atime = inode->i_mtime = |
| 335 | hfs_m_to_utime(rec->dir.MdDat); |
| 336 | inode->i_op = &hfs_dir_inode_operations; |
| 337 | inode->i_fop = &hfs_dir_operations; |
| 338 | break; |
| 339 | default: |
| 340 | make_bad_inode(inode); |
| 341 | } |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * __hfs_iget() |
| 347 | * |
| 348 | * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in |
| 349 | * the catalog B-tree and the 'type' of the desired file return the |
| 350 | * inode for that file/directory or NULL. Note that 'type' indicates |
| 351 | * whether we want the actual file or directory, or the corresponding |
| 352 | * metadata (AppleDouble header file or CAP metadata file). |
| 353 | */ |
| 354 | struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) |
| 355 | { |
| 356 | struct hfs_iget_data data = { key, rec }; |
| 357 | struct inode *inode; |
| 358 | u32 cnid; |
| 359 | |
| 360 | switch (rec->type) { |
| 361 | case HFS_CDR_DIR: |
| 362 | cnid = be32_to_cpu(rec->dir.DirID); |
| 363 | break; |
| 364 | case HFS_CDR_FIL: |
| 365 | cnid = be32_to_cpu(rec->file.FlNum); |
| 366 | break; |
| 367 | default: |
| 368 | return NULL; |
| 369 | } |
| 370 | inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); |
| 371 | if (inode && (inode->i_state & I_NEW)) |
| 372 | unlock_new_inode(inode); |
| 373 | return inode; |
| 374 | } |
| 375 | |
| 376 | void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, |
| 377 | __be32 *log_size, __be32 *phys_size) |
| 378 | { |
| 379 | memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); |
| 380 | |
| 381 | if (log_size) |
| 382 | *log_size = cpu_to_be32(inode->i_size); |
| 383 | if (phys_size) |
| 384 | *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * |
| 385 | HFS_SB(inode->i_sb)->alloc_blksz); |
| 386 | } |
| 387 | |
| 388 | int hfs_write_inode(struct inode *inode, int unused) |
| 389 | { |
| 390 | struct inode *main_inode = inode; |
| 391 | struct hfs_find_data fd; |
| 392 | hfs_cat_rec rec; |
| 393 | |
| 394 | dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino); |
| 395 | hfs_ext_write_extent(inode); |
| 396 | |
| 397 | if (inode->i_ino < HFS_FIRSTUSER_CNID) { |
| 398 | switch (inode->i_ino) { |
| 399 | case HFS_ROOT_CNID: |
| 400 | break; |
| 401 | case HFS_EXT_CNID: |
| 402 | hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); |
| 403 | return 0; |
| 404 | case HFS_CAT_CNID: |
| 405 | hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); |
| 406 | return 0; |
| 407 | default: |
| 408 | BUG(); |
| 409 | return -EIO; |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | if (HFS_IS_RSRC(inode)) |
| 414 | main_inode = HFS_I(inode)->rsrc_inode; |
| 415 | |
| 416 | if (!main_inode->i_nlink) |
| 417 | return 0; |
| 418 | |
| 419 | if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) |
| 420 | /* panic? */ |
| 421 | return -EIO; |
| 422 | |
| 423 | fd.search_key->cat = HFS_I(main_inode)->cat_key; |
| 424 | if (hfs_brec_find(&fd)) |
| 425 | /* panic? */ |
| 426 | goto out; |
| 427 | |
| 428 | if (S_ISDIR(main_inode->i_mode)) { |
| 429 | if (fd.entrylength < sizeof(struct hfs_cat_dir)) |
| 430 | /* panic? */; |
| 431 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, |
| 432 | sizeof(struct hfs_cat_dir)); |
| 433 | if (rec.type != HFS_CDR_DIR || |
| 434 | be32_to_cpu(rec.dir.DirID) != inode->i_ino) { |
| 435 | } |
| 436 | |
| 437 | rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); |
| 438 | rec.dir.Val = cpu_to_be16(inode->i_size - 2); |
| 439 | |
| 440 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, |
| 441 | sizeof(struct hfs_cat_dir)); |
| 442 | } else if (HFS_IS_RSRC(inode)) { |
| 443 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, |
| 444 | sizeof(struct hfs_cat_file)); |
| 445 | hfs_inode_write_fork(inode, rec.file.RExtRec, |
| 446 | &rec.file.RLgLen, &rec.file.RPyLen); |
| 447 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, |
| 448 | sizeof(struct hfs_cat_file)); |
| 449 | } else { |
| 450 | if (fd.entrylength < sizeof(struct hfs_cat_file)) |
| 451 | /* panic? */; |
| 452 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, |
| 453 | sizeof(struct hfs_cat_file)); |
| 454 | if (rec.type != HFS_CDR_FIL || |
| 455 | be32_to_cpu(rec.file.FlNum) != inode->i_ino) { |
| 456 | } |
| 457 | |
| 458 | if (inode->i_mode & S_IWUSR) |
| 459 | rec.file.Flags &= ~HFS_FIL_LOCK; |
| 460 | else |
| 461 | rec.file.Flags |= HFS_FIL_LOCK; |
| 462 | hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); |
| 463 | rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); |
| 464 | |
| 465 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, |
| 466 | sizeof(struct hfs_cat_file)); |
| 467 | } |
| 468 | out: |
| 469 | hfs_find_exit(&fd); |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, |
| 474 | struct nameidata *nd) |
| 475 | { |
| 476 | struct inode *inode = NULL; |
| 477 | hfs_cat_rec rec; |
| 478 | struct hfs_find_data fd; |
| 479 | int res; |
| 480 | |
| 481 | if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) |
| 482 | goto out; |
| 483 | |
| 484 | inode = HFS_I(dir)->rsrc_inode; |
| 485 | if (inode) |
| 486 | goto out; |
| 487 | |
| 488 | inode = new_inode(dir->i_sb); |
| 489 | if (!inode) |
| 490 | return ERR_PTR(-ENOMEM); |
| 491 | |
| 492 | hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); |
| 493 | fd.search_key->cat = HFS_I(dir)->cat_key; |
| 494 | res = hfs_brec_read(&fd, &rec, sizeof(rec)); |
| 495 | if (!res) { |
| 496 | struct hfs_iget_data idata = { NULL, &rec }; |
| 497 | hfs_read_inode(inode, &idata); |
| 498 | } |
| 499 | hfs_find_exit(&fd); |
| 500 | if (res) { |
| 501 | iput(inode); |
| 502 | return ERR_PTR(res); |
| 503 | } |
| 504 | HFS_I(inode)->rsrc_inode = dir; |
| 505 | HFS_I(dir)->rsrc_inode = inode; |
| 506 | igrab(dir); |
| 507 | hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes); |
| 508 | mark_inode_dirty(inode); |
| 509 | out: |
| 510 | d_add(dentry, inode); |
| 511 | return NULL; |
| 512 | } |
| 513 | |
| 514 | void hfs_clear_inode(struct inode *inode) |
| 515 | { |
| 516 | if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { |
| 517 | HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; |
| 518 | iput(HFS_I(inode)->rsrc_inode); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | static int hfs_permission(struct inode *inode, int mask, |
| 523 | struct nameidata *nd) |
| 524 | { |
| 525 | if (S_ISREG(inode->i_mode) && mask & MAY_EXEC) |
| 526 | return 0; |
| 527 | return generic_permission(inode, mask, NULL); |
| 528 | } |
| 529 | |
| 530 | static int hfs_file_open(struct inode *inode, struct file *file) |
| 531 | { |
| 532 | if (HFS_IS_RSRC(inode)) |
| 533 | inode = HFS_I(inode)->rsrc_inode; |
| 534 | if (atomic_read(&file->f_count) != 1) |
| 535 | return 0; |
| 536 | atomic_inc(&HFS_I(inode)->opencnt); |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | static int hfs_file_release(struct inode *inode, struct file *file) |
| 541 | { |
| 542 | //struct super_block *sb = inode->i_sb; |
| 543 | |
| 544 | if (HFS_IS_RSRC(inode)) |
| 545 | inode = HFS_I(inode)->rsrc_inode; |
| 546 | if (atomic_read(&file->f_count) != 0) |
| 547 | return 0; |
| 548 | if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 549 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | hfs_file_truncate(inode); |
| 551 | //if (inode->i_flags & S_DEAD) { |
| 552 | // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); |
| 553 | // hfs_delete_inode(inode); |
| 554 | //} |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 555 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * hfs_notify_change() |
| 562 | * |
| 563 | * Based very closely on fs/msdos/inode.c by Werner Almesberger |
| 564 | * |
| 565 | * This is the notify_change() field in the super_operations structure |
| 566 | * for HFS file systems. The purpose is to take that changes made to |
| 567 | * an inode and apply then in a filesystem-dependent manner. In this |
| 568 | * case the process has a few of tasks to do: |
| 569 | * 1) prevent changes to the i_uid and i_gid fields. |
| 570 | * 2) map file permissions to the closest allowable permissions |
| 571 | * 3) Since multiple Linux files can share the same on-disk inode under |
| 572 | * HFS (for instance the data and resource forks of a file) a change |
| 573 | * to permissions must be applied to all other in-core inodes which |
| 574 | * correspond to the same HFS file. |
| 575 | */ |
| 576 | |
| 577 | int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) |
| 578 | { |
| 579 | struct inode *inode = dentry->d_inode; |
| 580 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); |
| 581 | int error; |
| 582 | |
| 583 | error = inode_change_ok(inode, attr); /* basic permission checks */ |
| 584 | if (error) |
| 585 | return error; |
| 586 | |
| 587 | /* no uig/gid changes and limit which mode bits can be set */ |
| 588 | if (((attr->ia_valid & ATTR_UID) && |
| 589 | (attr->ia_uid != hsb->s_uid)) || |
| 590 | ((attr->ia_valid & ATTR_GID) && |
| 591 | (attr->ia_gid != hsb->s_gid)) || |
| 592 | ((attr->ia_valid & ATTR_MODE) && |
| 593 | ((S_ISDIR(inode->i_mode) && |
| 594 | (attr->ia_mode != inode->i_mode)) || |
| 595 | (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { |
| 596 | return hsb->s_quiet ? 0 : error; |
| 597 | } |
| 598 | |
| 599 | if (attr->ia_valid & ATTR_MODE) { |
| 600 | /* Only the 'w' bits can ever change and only all together. */ |
| 601 | if (attr->ia_mode & S_IWUSR) |
| 602 | attr->ia_mode = inode->i_mode | S_IWUGO; |
| 603 | else |
| 604 | attr->ia_mode = inode->i_mode & ~S_IWUGO; |
| 605 | attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; |
| 606 | } |
| 607 | error = inode_setattr(inode, attr); |
| 608 | if (error) |
| 609 | return error; |
| 610 | |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | |
| 615 | static struct file_operations hfs_file_operations = { |
| 616 | .llseek = generic_file_llseek, |
| 617 | .read = generic_file_read, |
| 618 | .write = generic_file_write, |
| 619 | .mmap = generic_file_mmap, |
| 620 | .sendfile = generic_file_sendfile, |
| 621 | .fsync = file_fsync, |
| 622 | .open = hfs_file_open, |
| 623 | .release = hfs_file_release, |
| 624 | }; |
| 625 | |
| 626 | static struct inode_operations hfs_file_inode_operations = { |
| 627 | .lookup = hfs_file_lookup, |
| 628 | .truncate = hfs_file_truncate, |
| 629 | .setattr = hfs_inode_setattr, |
| 630 | .permission = hfs_permission, |
| 631 | .setxattr = hfs_setxattr, |
| 632 | .getxattr = hfs_getxattr, |
| 633 | .listxattr = hfs_listxattr, |
| 634 | }; |