]> bbs.cooldavid.org Git - net-next-2.6.git/blame - fs/hfsplus/super.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] reiserfs: handle cnode allocation failure gracefully
[net-next-2.6.git] / fs / hfsplus / super.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/hfsplus/super.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 */
9
10#include <linux/config.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/pagemap.h>
14#include <linux/fs.h>
15#include <linux/sched.h>
16#include <linux/slab.h>
1da177e4
LT		 17#include <linux/vfs.h>
18#include <linux/nls.h>
19
20static struct inode *hfsplus_alloc_inode(struct super_block *sb);
21static void hfsplus_destroy_inode(struct inode *inode);
22
23#include "hfsplus_fs.h"
24
25void hfsplus_inode_check(struct super_block *sb)
26{
27#if 0
28 u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
29 u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
30
31 if (cnt <= (last_cnt / 2) ||
32 cnt >= (last_cnt * 2)) {
33 HFSPLUS_SB(sb).last_inode_cnt = cnt;
34 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
35 HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
36 }
37#endif
38}
39
40static void hfsplus_read_inode(struct inode *inode)
41{
42 struct hfs_find_data fd;
43 struct hfsplus_vh *vhdr;
44 int err;
45
46 atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
47 hfsplus_inode_check(inode->i_sb);
48 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
49 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
50 HFSPLUS_I(inode).flags = 0;
51 HFSPLUS_I(inode).rsrc_inode = NULL;
94c1d318 52 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
1da177e4
LT		 53
54 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
55 read_inode:
56 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
57 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
58 if (!err)
59 err = hfsplus_cat_read_inode(inode, &fd);
60 hfs_find_exit(&fd);
61 if (err)
62 goto bad_inode;
63 return;
64 }
65 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
66 switch(inode->i_ino) {
67 case HFSPLUS_ROOT_CNID:
68 goto read_inode;
69 case HFSPLUS_EXT_CNID:
70 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
71 inode->i_mapping->a_ops = &hfsplus_btree_aops;
72 break;
73 case HFSPLUS_CAT_CNID:
74 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
75 inode->i_mapping->a_ops = &hfsplus_btree_aops;
76 break;
77 case HFSPLUS_ALLOC_CNID:
78 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
79 inode->i_mapping->a_ops = &hfsplus_aops;
80 break;
81 case HFSPLUS_START_CNID:
82 hfsplus_inode_read_fork(inode, &vhdr->start_file);
83 break;
84 case HFSPLUS_ATTR_CNID:
85 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
86 inode->i_mapping->a_ops = &hfsplus_btree_aops;
87 break;
88 default:
89 goto bad_inode;
90 }
91
92 return;
93
94 bad_inode:
95 make_bad_inode(inode);
96}
97
98static int hfsplus_write_inode(struct inode *inode, int unused)
99{
100 struct hfsplus_vh *vhdr;
101 int ret = 0;
102
103 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
104 hfsplus_ext_write_extent(inode);
105 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
106 return hfsplus_cat_write_inode(inode);
107 }
108 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
109 switch (inode->i_ino) {
110 case HFSPLUS_ROOT_CNID:
111 ret = hfsplus_cat_write_inode(inode);
112 break;
113 case HFSPLUS_EXT_CNID:
114 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
115 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
116 inode->i_sb->s_dirt = 1;
117 }
118 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
119 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
120 break;
121 case HFSPLUS_CAT_CNID:
122 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
123 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
124 inode->i_sb->s_dirt = 1;
125 }
126 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
127 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
128 break;
129 case HFSPLUS_ALLOC_CNID:
130 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
131 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
132 inode->i_sb->s_dirt = 1;
133 }
134 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
135 break;
136 case HFSPLUS_START_CNID:
137 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
138 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
139 inode->i_sb->s_dirt = 1;
140 }
141 hfsplus_inode_write_fork(inode, &vhdr->start_file);
142 break;
143 case HFSPLUS_ATTR_CNID:
144 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
145 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
146 inode->i_sb->s_dirt = 1;
147 }
148 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
149 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
150 break;
151 }
152 return ret;
153}
154
155static void hfsplus_clear_inode(struct inode *inode)
156{
157 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
158 atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
159 if (HFSPLUS_IS_RSRC(inode)) {
160 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
161 iput(HFSPLUS_I(inode).rsrc_inode);
162 }
163 hfsplus_inode_check(inode->i_sb);
164}
165
166static void hfsplus_write_super(struct super_block *sb)
167{
168 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
169
170 dprint(DBG_SUPER, "hfsplus_write_super\n");
171 sb->s_dirt = 0;
172 if (sb->s_flags & MS_RDONLY)
173 /* warn? */
174 return;
175
176 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
177 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
178 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
179 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
180 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
181
182 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
183 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
184 if (HFSPLUS_SB(sb).sect_count) {
185 struct buffer_head *bh;
186 u32 block, offset;
187
188 block = HFSPLUS_SB(sb).blockoffset;
189 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
190 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
191 printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
192 HFSPLUS_SB(sb).sect_count, block, offset);
193 bh = sb_bread(sb, block);
194 if (bh) {
195 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
196 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
197 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
198 mark_buffer_dirty(bh);
199 brelse(bh);
200 } else
201 printk("backup not found!\n");
202 }
203 }
204 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
205 }
206}
207
208static void hfsplus_put_super(struct super_block *sb)
209{
210 dprint(DBG_SUPER, "hfsplus_put_super\n");
945b0920
CL		 211 if (!sb->s_fs_info)
212 return;
213 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
1da177e4
LT		 214 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
215
216 vhdr->modify_date = hfsp_now2mt();
217 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
218 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
219 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8 220 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4
LT		 221 }
222
223 hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
224 hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
225 iput(HFSPLUS_SB(sb).alloc_file);
226 iput(HFSPLUS_SB(sb).hidden_dir);
227 brelse(HFSPLUS_SB(sb).s_vhbh);
228 if (HFSPLUS_SB(sb).nls)
229 unload_nls(HFSPLUS_SB(sb).nls);
945b0920
CL		 230 kfree(sb->s_fs_info);
231 sb->s_fs_info = NULL;
1da177e4
LT		 232}
233
234static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
235{
236 buf->f_type = HFSPLUS_SUPER_MAGIC;
237 buf->f_bsize = sb->s_blocksize;
238 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
239 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
240 buf->f_bavail = buf->f_bfree;
241 buf->f_files = 0xFFFFFFFF;
242 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
243 buf->f_namelen = HFSPLUS_MAX_STRLEN;
244
245 return 0;
246}
247
248static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
249{
250 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
251 return 0;
252 if (!(*flags & MS_RDONLY)) {
253 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
254
255 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
256 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
257 "running fsck.hfsplus is recommended. leaving read-only.\n");
258 sb->s_flags |= MS_RDONLY;
259 *flags |= MS_RDONLY;
260 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
261 printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
262 sb->s_flags |= MS_RDONLY;
263 *flags |= MS_RDONLY;
264 }
265 }
266 return 0;
267}
268
269static struct super_operations hfsplus_sops = {
270 .alloc_inode = hfsplus_alloc_inode,
271 .destroy_inode = hfsplus_destroy_inode,
272 .read_inode = hfsplus_read_inode,
273 .write_inode = hfsplus_write_inode,
274 .clear_inode = hfsplus_clear_inode,
275 .put_super = hfsplus_put_super,
276 .write_super = hfsplus_write_super,
277 .statfs = hfsplus_statfs,
278 .remount_fs = hfsplus_remount,
717dd80e 279 .show_options = hfsplus_show_options,
1da177e4
LT		 280};
281
282static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
283{
284 struct hfsplus_vh *vhdr;
285 struct hfsplus_sb_info *sbi;
286 hfsplus_cat_entry entry;
287 struct hfs_find_data fd;
288 struct inode *root;
289 struct qstr str;
290 struct nls_table *nls = NULL;
291 int err = -EINVAL;
292
293 sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
294 if (!sbi)
295 return -ENOMEM;
296
297 memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
298 sb->s_fs_info = sbi;
299 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
717dd80e
RZ		 300 hfsplus_fill_defaults(sbi);
301 if (!hfsplus_parse_options(data, sbi)) {
1da177e4
LT		 302 if (!silent)
303 printk("HFS+-fs: unable to parse mount options\n");
304 err = -EINVAL;
305 goto cleanup;
306 }
307
308 /* temporarily use utf8 to correctly find the hidden dir below */
309 nls = sbi->nls;
310 sbi->nls = load_nls("utf8");
311 if (!nls) {
312 printk("HFS+: unable to load nls for utf8\n");
313 err = -EINVAL;
314 goto cleanup;
315 }
316
317 /* Grab the volume header */
318 if (hfsplus_read_wrapper(sb)) {
319 if (!silent)
320 printk("HFS+-fs: unable to find HFS+ superblock\n");
321 err = -EINVAL;
322 goto cleanup;
323 }
324 vhdr = HFSPLUS_SB(sb).s_vhdr;
325
326 /* Copy parts of the volume header into the superblock */
327 sb->s_magic = be16_to_cpu(vhdr->signature);
328 if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
329 if (!silent)
330 printk("HFS+-fs: wrong filesystem version\n");
331 goto cleanup;
332 }
333 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
334 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
335 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
336 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
337 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
338 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
339 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
340 if (!HFSPLUS_SB(sb).data_clump_blocks)
341 HFSPLUS_SB(sb).data_clump_blocks = 1;
342 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
343 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
344 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
345
346 /* Set up operations so we can load metadata */
347 sb->s_op = &hfsplus_sops;
348 sb->s_maxbytes = MAX_LFS_FILESIZE;
349
350 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
351 if (!silent)
352 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
353 "running fsck.hfsplus is recommended. mounting read-only.\n");
354 sb->s_flags |= MS_RDONLY;
355 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
356 if (!silent)
357 printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
358 sb->s_flags |= MS_RDONLY;
359 }
360
361 /* Load metadata objects (B*Trees) */
362 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
363 if (!HFSPLUS_SB(sb).ext_tree) {
364 if (!silent)
365 printk("HFS+-fs: failed to load extents file\n");
366 goto cleanup;
367 }
368 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
369 if (!HFSPLUS_SB(sb).cat_tree) {
370 if (!silent)
371 printk("HFS+-fs: failed to load catalog file\n");
372 goto cleanup;
373 }
374
375 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
376 if (!HFSPLUS_SB(sb).alloc_file) {
377 if (!silent)
378 printk("HFS+-fs: failed to load allocation file\n");
379 goto cleanup;
380 }
381
382 /* Load the root directory */
383 root = iget(sb, HFSPLUS_ROOT_CNID);
384 sb->s_root = d_alloc_root(root);
385 if (!sb->s_root) {
386 if (!silent)
387 printk("HFS+-fs: failed to load root directory\n");
388 iput(root);
389 goto cleanup;
390 }
391
392 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
393 str.name = HFSP_HIDDENDIR_NAME;
394 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
395 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
396 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
397 hfs_find_exit(&fd);
398 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
399 goto cleanup;
400 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
401 if (!HFSPLUS_SB(sb).hidden_dir)
402 goto cleanup;
403 } else
404 hfs_find_exit(&fd);
405
406 if (sb->s_flags & MS_RDONLY)
407 goto out;
408
409 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
410 * all three are registered with Apple for our use
411 */
412 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
413 vhdr->modify_date = hfsp_now2mt();
414 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
415 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
416 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
417 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
e39f07c8 418 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
1da177e4
LT		 419
420 if (!HFSPLUS_SB(sb).hidden_dir) {
421 printk("HFS+: create hidden dir...\n");
422 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
423 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
424 &str, HFSPLUS_SB(sb).hidden_dir);
425 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
426 }
427out:
428 unload_nls(sbi->nls);
429 sbi->nls = nls;
430 return 0;
431
432cleanup:
433 hfsplus_put_super(sb);
434 if (nls)
435 unload_nls(nls);
436 return err;
437}
438
439MODULE_AUTHOR("Brad Boyer");
440MODULE_DESCRIPTION("Extended Macintosh Filesystem");
441MODULE_LICENSE("GPL");
442
443static kmem_cache_t *hfsplus_inode_cachep;
444
445static struct inode *hfsplus_alloc_inode(struct super_block *sb)
446{
447 struct hfsplus_inode_info *i;
448
449 i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
450 return i ? &i->vfs_inode : NULL;
451}
452
453static void hfsplus_destroy_inode(struct inode *inode)
454{
455 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
456}
457
458#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
459
460static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
461 int flags, const char *dev_name, void *data)
462{
463 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
464}
465
466static struct file_system_type hfsplus_fs_type = {
467 .owner = THIS_MODULE,
468 .name = "hfsplus",
469 .get_sb = hfsplus_get_sb,
470 .kill_sb = kill_block_super,
471 .fs_flags = FS_REQUIRES_DEV,
472};
473
474static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
475{
476 struct hfsplus_inode_info *i = p;
477
478 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
479 inode_init_once(&i->vfs_inode);
480}
481
482static int __init init_hfsplus_fs(void)
483{
484 int err;
485
486 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
487 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
488 hfsplus_init_once, NULL);
489 if (!hfsplus_inode_cachep)
490 return -ENOMEM;
491 err = register_filesystem(&hfsplus_fs_type);
492 if (err)
493 kmem_cache_destroy(hfsplus_inode_cachep);
494 return err;
495}
496
497static void __exit exit_hfsplus_fs(void)
498{
499 unregister_filesystem(&hfsplus_fs_type);
500 if (kmem_cache_destroy(hfsplus_inode_cachep))
501 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
502}
503
504module_init(init_hfsplus_fs)
505module_exit(exit_hfsplus_fs)
Clone of davem's net-next-2.6 tree