Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/hfs/super.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 hfs_read_super(), some of the super_ops and |
| 9 | * init_module() and cleanup_module(). The remaining super_ops are in |
| 10 | * inode.c since they deal with inodes. |
| 11 | * |
| 12 | * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/blkdev.h> |
Roman Zippel | 717dd80e | 2005-09-06 15:18:48 -0700 | [diff] [blame] | 18 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 20 | #include <linux/nls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/parser.h> |
Roman Zippel | 717dd80e | 2005-09-06 15:18:48 -0700 | [diff] [blame] | 22 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/vfs.h> |
| 24 | |
| 25 | #include "hfs_fs.h" |
| 26 | #include "btree.h" |
| 27 | |
| 28 | static kmem_cache_t *hfs_inode_cachep; |
| 29 | |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | |
| 32 | /* |
| 33 | * hfs_write_super() |
| 34 | * |
| 35 | * Description: |
| 36 | * This function is called by the VFS only. When the filesystem |
| 37 | * is mounted r/w it updates the MDB on disk. |
| 38 | * Input Variable(s): |
| 39 | * struct super_block *sb: Pointer to the hfs superblock |
| 40 | * Output Variable(s): |
| 41 | * NONE |
| 42 | * Returns: |
| 43 | * void |
| 44 | * Preconditions: |
| 45 | * 'sb' points to a "valid" (struct super_block). |
| 46 | * Postconditions: |
| 47 | * The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb |
| 48 | * (hfs_put_super() must set this flag!). Some MDB fields are updated |
| 49 | * and the MDB buffer is written to disk by calling hfs_mdb_commit(). |
| 50 | */ |
| 51 | static void hfs_write_super(struct super_block *sb) |
| 52 | { |
| 53 | sb->s_dirt = 0; |
| 54 | if (sb->s_flags & MS_RDONLY) |
| 55 | return; |
| 56 | /* sync everything to the buffers */ |
| 57 | hfs_mdb_commit(sb); |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * hfs_put_super() |
| 62 | * |
| 63 | * This is the put_super() entry in the super_operations structure for |
| 64 | * HFS filesystems. The purpose is to release the resources |
| 65 | * associated with the superblock sb. |
| 66 | */ |
| 67 | static void hfs_put_super(struct super_block *sb) |
| 68 | { |
| 69 | hfs_mdb_close(sb); |
| 70 | /* release the MDB's resources */ |
| 71 | hfs_mdb_put(sb); |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * hfs_statfs() |
| 76 | * |
| 77 | * This is the statfs() entry in the super_operations structure for |
| 78 | * HFS filesystems. The purpose is to return various data about the |
| 79 | * filesystem. |
| 80 | * |
| 81 | * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. |
| 82 | */ |
| 83 | static int hfs_statfs(struct super_block *sb, struct kstatfs *buf) |
| 84 | { |
| 85 | buf->f_type = HFS_SUPER_MAGIC; |
| 86 | buf->f_bsize = sb->s_blocksize; |
| 87 | buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; |
| 88 | buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; |
| 89 | buf->f_bavail = buf->f_bfree; |
| 90 | buf->f_files = HFS_SB(sb)->fs_ablocks; |
| 91 | buf->f_ffree = HFS_SB(sb)->free_ablocks; |
| 92 | buf->f_namelen = HFS_NAMELEN; |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | static int hfs_remount(struct super_block *sb, int *flags, char *data) |
| 98 | { |
| 99 | *flags |= MS_NODIRATIME; |
| 100 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 101 | return 0; |
| 102 | if (!(*flags & MS_RDONLY)) { |
| 103 | if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { |
| 104 | printk("HFS-fs warning: Filesystem was not cleanly unmounted, " |
| 105 | "running fsck.hfs is recommended. leaving read-only.\n"); |
| 106 | sb->s_flags |= MS_RDONLY; |
| 107 | *flags |= MS_RDONLY; |
| 108 | } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { |
| 109 | printk("HFS-fs: Filesystem is marked locked, leaving read-only.\n"); |
| 110 | sb->s_flags |= MS_RDONLY; |
| 111 | *flags |= MS_RDONLY; |
| 112 | } |
| 113 | } |
| 114 | return 0; |
| 115 | } |
| 116 | |
Roman Zippel | 717dd80e | 2005-09-06 15:18:48 -0700 | [diff] [blame] | 117 | static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
| 118 | { |
| 119 | struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb); |
| 120 | |
| 121 | if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) |
| 122 | seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator); |
| 123 | if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) |
| 124 | seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type); |
| 125 | seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid); |
| 126 | if (sbi->s_file_umask != 0133) |
| 127 | seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); |
| 128 | if (sbi->s_dir_umask != 0022) |
| 129 | seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); |
| 130 | if (sbi->part >= 0) |
| 131 | seq_printf(seq, ",part=%u", sbi->part); |
| 132 | if (sbi->session >= 0) |
| 133 | seq_printf(seq, ",session=%u", sbi->session); |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 134 | if (sbi->nls_disk) |
| 135 | seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); |
| 136 | if (sbi->nls_io) |
| 137 | seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); |
Roman Zippel | 717dd80e | 2005-09-06 15:18:48 -0700 | [diff] [blame] | 138 | if (sbi->s_quiet) |
| 139 | seq_printf(seq, ",quiet"); |
| 140 | return 0; |
| 141 | } |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | static struct inode *hfs_alloc_inode(struct super_block *sb) |
| 144 | { |
| 145 | struct hfs_inode_info *i; |
| 146 | |
| 147 | i = kmem_cache_alloc(hfs_inode_cachep, SLAB_KERNEL); |
| 148 | return i ? &i->vfs_inode : NULL; |
| 149 | } |
| 150 | |
| 151 | static void hfs_destroy_inode(struct inode *inode) |
| 152 | { |
| 153 | kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); |
| 154 | } |
| 155 | |
| 156 | static struct super_operations hfs_super_operations = { |
| 157 | .alloc_inode = hfs_alloc_inode, |
| 158 | .destroy_inode = hfs_destroy_inode, |
| 159 | .write_inode = hfs_write_inode, |
| 160 | .clear_inode = hfs_clear_inode, |
| 161 | .put_super = hfs_put_super, |
| 162 | .write_super = hfs_write_super, |
| 163 | .statfs = hfs_statfs, |
| 164 | .remount_fs = hfs_remount, |
Roman Zippel | 717dd80e | 2005-09-06 15:18:48 -0700 | [diff] [blame] | 165 | .show_options = hfs_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | }; |
| 167 | |
| 168 | enum { |
| 169 | opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, |
| 170 | opt_part, opt_session, opt_type, opt_creator, opt_quiet, |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 171 | opt_codepage, opt_iocharset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | opt_err |
| 173 | }; |
| 174 | |
| 175 | static match_table_t tokens = { |
| 176 | { opt_uid, "uid=%u" }, |
| 177 | { opt_gid, "gid=%u" }, |
| 178 | { opt_umask, "umask=%o" }, |
| 179 | { opt_file_umask, "file_umask=%o" }, |
| 180 | { opt_dir_umask, "dir_umask=%o" }, |
| 181 | { opt_part, "part=%u" }, |
| 182 | { opt_session, "session=%u" }, |
| 183 | { opt_type, "type=%s" }, |
| 184 | { opt_creator, "creator=%s" }, |
| 185 | { opt_quiet, "quiet" }, |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 186 | { opt_codepage, "codepage=%s" }, |
| 187 | { opt_iocharset, "iocharset=%s" }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { opt_err, NULL } |
| 189 | }; |
| 190 | |
| 191 | static inline int match_fourchar(substring_t *arg, u32 *result) |
| 192 | { |
| 193 | if (arg->to - arg->from != 4) |
| 194 | return -EINVAL; |
| 195 | memcpy(result, arg->from, 4); |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * parse_options() |
| 201 | * |
| 202 | * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger |
| 203 | * This function is called by hfs_read_super() to parse the mount options. |
| 204 | */ |
| 205 | static int parse_options(char *options, struct hfs_sb_info *hsb) |
| 206 | { |
| 207 | char *p; |
| 208 | substring_t args[MAX_OPT_ARGS]; |
| 209 | int tmp, token; |
| 210 | |
| 211 | /* initialize the sb with defaults */ |
| 212 | hsb->s_uid = current->uid; |
| 213 | hsb->s_gid = current->gid; |
| 214 | hsb->s_file_umask = 0133; |
| 215 | hsb->s_dir_umask = 0022; |
| 216 | hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ |
| 217 | hsb->s_quiet = 0; |
| 218 | hsb->part = -1; |
| 219 | hsb->session = -1; |
| 220 | |
| 221 | if (!options) |
| 222 | return 1; |
| 223 | |
| 224 | while ((p = strsep(&options, ",")) != NULL) { |
| 225 | if (!*p) |
| 226 | continue; |
| 227 | |
| 228 | token = match_token(p, tokens, args); |
| 229 | switch (token) { |
| 230 | case opt_uid: |
| 231 | if (match_int(&args[0], &tmp)) { |
| 232 | printk("HFS: uid requires an argument\n"); |
| 233 | return 0; |
| 234 | } |
| 235 | hsb->s_uid = (uid_t)tmp; |
| 236 | break; |
| 237 | case opt_gid: |
| 238 | if (match_int(&args[0], &tmp)) { |
| 239 | printk("HFS: gid requires an argument\n"); |
| 240 | return 0; |
| 241 | } |
| 242 | hsb->s_gid = (gid_t)tmp; |
| 243 | break; |
| 244 | case opt_umask: |
| 245 | if (match_octal(&args[0], &tmp)) { |
| 246 | printk("HFS: umask requires a value\n"); |
| 247 | return 0; |
| 248 | } |
| 249 | hsb->s_file_umask = (umode_t)tmp; |
| 250 | hsb->s_dir_umask = (umode_t)tmp; |
| 251 | break; |
| 252 | case opt_file_umask: |
| 253 | if (match_octal(&args[0], &tmp)) { |
| 254 | printk("HFS: file_umask requires a value\n"); |
| 255 | return 0; |
| 256 | } |
| 257 | hsb->s_file_umask = (umode_t)tmp; |
| 258 | break; |
| 259 | case opt_dir_umask: |
| 260 | if (match_octal(&args[0], &tmp)) { |
| 261 | printk("HFS: dir_umask requires a value\n"); |
| 262 | return 0; |
| 263 | } |
| 264 | hsb->s_dir_umask = (umode_t)tmp; |
| 265 | break; |
| 266 | case opt_part: |
| 267 | if (match_int(&args[0], &hsb->part)) { |
| 268 | printk("HFS: part requires an argument\n"); |
| 269 | return 0; |
| 270 | } |
| 271 | break; |
| 272 | case opt_session: |
| 273 | if (match_int(&args[0], &hsb->session)) { |
| 274 | printk("HFS: session requires an argument\n"); |
| 275 | return 0; |
| 276 | } |
| 277 | break; |
| 278 | case opt_type: |
| 279 | if (match_fourchar(&args[0], &hsb->s_type)) { |
| 280 | printk("HFS+-fs: type requires a 4 character value\n"); |
| 281 | return 0; |
| 282 | } |
| 283 | break; |
| 284 | case opt_creator: |
| 285 | if (match_fourchar(&args[0], &hsb->s_creator)) { |
| 286 | printk("HFS+-fs: creator requires a 4 character value\n"); |
| 287 | return 0; |
| 288 | } |
| 289 | break; |
| 290 | case opt_quiet: |
| 291 | hsb->s_quiet = 1; |
| 292 | break; |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 293 | case opt_codepage: |
| 294 | if (hsb->nls_disk) { |
| 295 | printk("HFS+-fs: unable to change codepage\n"); |
| 296 | return 0; |
| 297 | } |
| 298 | p = match_strdup(&args[0]); |
| 299 | hsb->nls_disk = load_nls(p); |
| 300 | if (!hsb->nls_disk) { |
| 301 | printk("HFS+-fs: unable to load codepage \"%s\"\n", p); |
| 302 | kfree(p); |
| 303 | return 0; |
| 304 | } |
| 305 | kfree(p); |
| 306 | break; |
| 307 | case opt_iocharset: |
| 308 | if (hsb->nls_io) { |
| 309 | printk("HFS: unable to change iocharset\n"); |
| 310 | return 0; |
| 311 | } |
| 312 | p = match_strdup(&args[0]); |
| 313 | hsb->nls_io = load_nls(p); |
| 314 | if (!hsb->nls_io) { |
| 315 | printk("HFS: unable to load iocharset \"%s\"\n", p); |
| 316 | kfree(p); |
| 317 | return 0; |
| 318 | } |
| 319 | kfree(p); |
| 320 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | default: |
| 322 | return 0; |
| 323 | } |
| 324 | } |
| 325 | |
Roman Zippel | 328b922 | 2005-09-06 15:18:49 -0700 | [diff] [blame] | 326 | if (hsb->nls_disk && !hsb->nls_io) { |
| 327 | hsb->nls_io = load_nls_default(); |
| 328 | if (!hsb->nls_io) { |
| 329 | printk("HFS: unable to load default iocharset\n"); |
| 330 | return 0; |
| 331 | } |
| 332 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | hsb->s_dir_umask &= 0777; |
| 334 | hsb->s_file_umask &= 0577; |
| 335 | |
| 336 | return 1; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * hfs_read_super() |
| 341 | * |
| 342 | * This is the function that is responsible for mounting an HFS |
| 343 | * filesystem. It performs all the tasks necessary to get enough data |
| 344 | * from the disk to read the root inode. This includes parsing the |
| 345 | * mount options, dealing with Macintosh partitions, reading the |
| 346 | * superblock and the allocation bitmap blocks, calling |
| 347 | * hfs_btree_init() to get the necessary data about the extents and |
| 348 | * catalog B-trees and, finally, reading the root inode into memory. |
| 349 | */ |
| 350 | static int hfs_fill_super(struct super_block *sb, void *data, int silent) |
| 351 | { |
| 352 | struct hfs_sb_info *sbi; |
| 353 | struct hfs_find_data fd; |
| 354 | hfs_cat_rec rec; |
| 355 | struct inode *root_inode; |
| 356 | int res; |
| 357 | |
| 358 | sbi = kmalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); |
| 359 | if (!sbi) |
| 360 | return -ENOMEM; |
| 361 | sb->s_fs_info = sbi; |
| 362 | memset(sbi, 0, sizeof(struct hfs_sb_info)); |
| 363 | INIT_HLIST_HEAD(&sbi->rsrc_inodes); |
| 364 | |
| 365 | res = -EINVAL; |
| 366 | if (!parse_options((char *)data, sbi)) { |
| 367 | hfs_warn("hfs_fs: unable to parse mount options.\n"); |
Colin Leroy | 945b092 | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 368 | goto bail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | sb->s_op = &hfs_super_operations; |
| 372 | sb->s_flags |= MS_NODIRATIME; |
| 373 | init_MUTEX(&sbi->bitmap_lock); |
| 374 | |
| 375 | res = hfs_mdb_get(sb); |
| 376 | if (res) { |
| 377 | if (!silent) |
| 378 | hfs_warn("VFS: Can't find a HFS filesystem on dev %s.\n", |
| 379 | hfs_mdb_name(sb)); |
| 380 | res = -EINVAL; |
Colin Leroy | 945b092 | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 381 | goto bail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | /* try to get the root inode */ |
| 385 | hfs_find_init(HFS_SB(sb)->cat_tree, &fd); |
| 386 | res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); |
| 387 | if (!res) |
| 388 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); |
| 389 | if (res) { |
| 390 | hfs_find_exit(&fd); |
| 391 | goto bail_no_root; |
| 392 | } |
| 393 | root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); |
| 394 | hfs_find_exit(&fd); |
| 395 | if (!root_inode) |
| 396 | goto bail_no_root; |
| 397 | |
| 398 | sb->s_root = d_alloc_root(root_inode); |
| 399 | if (!sb->s_root) |
| 400 | goto bail_iput; |
| 401 | |
| 402 | sb->s_root->d_op = &hfs_dentry_operations; |
| 403 | |
| 404 | /* everything's okay */ |
| 405 | return 0; |
| 406 | |
| 407 | bail_iput: |
| 408 | iput(root_inode); |
| 409 | bail_no_root: |
| 410 | hfs_warn("hfs_fs: get root inode failed.\n"); |
Colin Leroy | 945b092 | 2005-05-01 08:59:16 -0700 | [diff] [blame] | 411 | bail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | hfs_mdb_put(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | return res; |
| 414 | } |
| 415 | |
| 416 | static struct super_block *hfs_get_sb(struct file_system_type *fs_type, |
| 417 | int flags, const char *dev_name, void *data) |
| 418 | { |
| 419 | return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super); |
| 420 | } |
| 421 | |
| 422 | static struct file_system_type hfs_fs_type = { |
| 423 | .owner = THIS_MODULE, |
| 424 | .name = "hfs", |
| 425 | .get_sb = hfs_get_sb, |
| 426 | .kill_sb = kill_block_super, |
| 427 | .fs_flags = FS_REQUIRES_DEV, |
| 428 | }; |
| 429 | |
| 430 | static void hfs_init_once(void *p, kmem_cache_t *cachep, unsigned long flags) |
| 431 | { |
| 432 | struct hfs_inode_info *i = p; |
| 433 | |
| 434 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) |
| 435 | inode_init_once(&i->vfs_inode); |
| 436 | } |
| 437 | |
| 438 | static int __init init_hfs_fs(void) |
| 439 | { |
| 440 | int err; |
| 441 | |
| 442 | hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", |
| 443 | sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN, |
| 444 | hfs_init_once, NULL); |
| 445 | if (!hfs_inode_cachep) |
| 446 | return -ENOMEM; |
| 447 | err = register_filesystem(&hfs_fs_type); |
| 448 | if (err) |
| 449 | kmem_cache_destroy(hfs_inode_cachep); |
| 450 | return err; |
| 451 | } |
| 452 | |
| 453 | static void __exit exit_hfs_fs(void) |
| 454 | { |
| 455 | unregister_filesystem(&hfs_fs_type); |
| 456 | if (kmem_cache_destroy(hfs_inode_cachep)) |
| 457 | printk(KERN_INFO "hfs_inode_cache: not all structures were freed\n"); |
| 458 | } |
| 459 | |
| 460 | module_init(init_hfs_fs) |
| 461 | module_exit(exit_hfs_fs) |