blob: 5849e3ef35cc9bdce0ddccbdf5186aafdf4fdee9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/hfsplus/extents.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 * Handling of Extents both in catalog and extents overflow trees
9 */
10
11#include <linux/errno.h>
12#include <linux/fs.h>
13#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include "hfsplus_fs.h"
16#include "hfsplus_raw.h"
17
18/* Compare two extents keys, returns 0 on same, pos/neg for difference */
David Elliott2179d372006-01-18 17:43:08 -080019int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
20 const hfsplus_btree_key *k2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021{
22 __be32 k1id, k2id;
23 __be32 k1s, k2s;
24
25 k1id = k1->ext.cnid;
26 k2id = k2->ext.cnid;
27 if (k1id != k2id)
28 return be32_to_cpu(k1id) < be32_to_cpu(k2id) ? -1 : 1;
29
30 if (k1->ext.fork_type != k2->ext.fork_type)
31 return k1->ext.fork_type < k2->ext.fork_type ? -1 : 1;
32
33 k1s = k1->ext.start_block;
34 k2s = k2->ext.start_block;
35 if (k1s == k2s)
36 return 0;
37 return be32_to_cpu(k1s) < be32_to_cpu(k2s) ? -1 : 1;
38}
39
40static void hfsplus_ext_build_key(hfsplus_btree_key *key, u32 cnid,
41 u32 block, u8 type)
42{
43 key->key_len = cpu_to_be16(HFSPLUS_EXT_KEYLEN - 2);
44 key->ext.cnid = cpu_to_be32(cnid);
45 key->ext.start_block = cpu_to_be32(block);
46 key->ext.fork_type = type;
47 key->ext.pad = 0;
48}
49
50static u32 hfsplus_ext_find_block(struct hfsplus_extent *ext, u32 off)
51{
52 int i;
53 u32 count;
54
55 for (i = 0; i < 8; ext++, i++) {
56 count = be32_to_cpu(ext->block_count);
57 if (off < count)
58 return be32_to_cpu(ext->start_block) + off;
59 off -= count;
60 }
61 /* panic? */
62 return 0;
63}
64
65static int hfsplus_ext_block_count(struct hfsplus_extent *ext)
66{
67 int i;
68 u32 count = 0;
69
70 for (i = 0; i < 8; ext++, i++)
71 count += be32_to_cpu(ext->block_count);
72 return count;
73}
74
75static u32 hfsplus_ext_lastblock(struct hfsplus_extent *ext)
76{
77 int i;
78
79 ext += 7;
80 for (i = 0; i < 7; ext--, i++)
81 if (ext->block_count)
82 break;
83 return be32_to_cpu(ext->start_block) + be32_to_cpu(ext->block_count);
84}
85
Anton Salikhmetov2753cc22010-12-16 18:08:38 +020086static void __hfsplus_ext_write_extent(struct inode *inode,
87 struct hfs_find_data *fd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Christoph Hellwig6af502d2010-10-01 05:43:31 +020089 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 int res;
91
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +020092 WARN_ON(!mutex_is_locked(&hip->extents_lock));
93
Christoph Hellwig6af502d2010-10-01 05:43:31 +020094 hfsplus_ext_build_key(fd->search_key, inode->i_ino, hip->cached_start,
95 HFSPLUS_IS_RSRC(inode) ?
96 HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 res = hfs_brec_find(fd);
Christoph Hellwigb33b7922010-11-23 14:38:13 +010099 if (hip->extent_state & HFSPLUS_EXT_NEW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (res != -ENOENT)
101 return;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200102 hfs_brec_insert(fd, hip->cached_extents,
103 sizeof(hfsplus_extent_rec));
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100104 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 } else {
106 if (res)
107 return;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200108 hfs_bnode_write(fd->bnode, hip->cached_extents,
109 fd->entryoffset, fd->entrylength);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100110 hip->extent_state &= ~HFSPLUS_EXT_DIRTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100112
113 /*
114 * We can't just use hfsplus_mark_inode_dirty here, because we
115 * also get called from hfsplus_write_inode, which should not
116 * redirty the inode. Instead the callers have to be careful
117 * to explicily mark the inode dirty, too.
118 */
119 set_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
121
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400122static int hfsplus_ext_write_extent_locked(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400124 int res;
125
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100126 if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 struct hfs_find_data fd;
128
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400129 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
130 if (res)
131 return res;
132 __hfsplus_ext_write_extent(inode, &fd);
133 hfs_find_exit(&fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400138int hfsplus_ext_write_extent(struct inode *inode)
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200139{
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400140 int res;
141
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200142 mutex_lock(&HFSPLUS_I(inode)->extents_lock);
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400143 res = hfsplus_ext_write_extent_locked(inode);
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200144 mutex_unlock(&HFSPLUS_I(inode)->extents_lock);
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400145
146 return res;
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200147}
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd,
150 struct hfsplus_extent *extent,
151 u32 cnid, u32 block, u8 type)
152{
153 int res;
154
155 hfsplus_ext_build_key(fd->search_key, cnid, block, type);
156 fd->key->ext.cnid = 0;
157 res = hfs_brec_find(fd);
158 if (res && res != -ENOENT)
159 return res;
160 if (fd->key->ext.cnid != fd->search_key->ext.cnid ||
161 fd->key->ext.fork_type != fd->search_key->ext.fork_type)
162 return -ENOENT;
163 if (fd->entrylength != sizeof(hfsplus_extent_rec))
164 return -EIO;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200165 hfs_bnode_read(fd->bnode, extent, fd->entryoffset,
166 sizeof(hfsplus_extent_rec));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return 0;
168}
169
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200170static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd,
171 struct inode *inode, u32 block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200173 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 int res;
175
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200176 WARN_ON(!mutex_is_locked(&hip->extents_lock));
177
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100178 if (hip->extent_state & HFSPLUS_EXT_DIRTY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 __hfsplus_ext_write_extent(inode, fd);
180
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200181 res = __hfsplus_ext_read_extent(fd, hip->cached_extents, inode->i_ino,
182 block, HFSPLUS_IS_RSRC(inode) ?
183 HFSPLUS_TYPE_RSRC :
184 HFSPLUS_TYPE_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200186 hip->cached_start = be32_to_cpu(fd->key->ext.start_block);
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200187 hip->cached_blocks =
188 hfsplus_ext_block_count(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 } else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200190 hip->cached_start = hip->cached_blocks = 0;
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100191 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193 return res;
194}
195
196static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
197{
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200198 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 struct hfs_find_data fd;
200 int res;
201
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200202 if (block >= hip->cached_start &&
203 block < hip->cached_start + hip->cached_blocks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 return 0;
205
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400206 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
207 if (!res) {
208 res = __hfsplus_ext_cache_extent(&fd, inode, block);
209 hfs_find_exit(&fd);
210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 return res;
212}
213
214/* Get a block at iblock for inode, possibly allocating if create */
215int hfsplus_get_block(struct inode *inode, sector_t iblock,
216 struct buffer_head *bh_result, int create)
217{
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200218 struct super_block *sb = inode->i_sb;
219 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200220 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 int res = -EIO;
222 u32 ablock, dblock, mask;
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100223 sector_t sector;
Christoph Hellwige3494702010-11-23 14:38:15 +0100224 int was_dirty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 int shift;
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 /* Convert inode block to disk allocation block */
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200228 shift = sbi->alloc_blksz_shift - sb->s_blocksize_bits;
229 ablock = iblock >> sbi->fs_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200231 if (iblock >= hip->fs_blocks) {
232 if (iblock > hip->fs_blocks || !create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EIO;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200234 if (ablock >= hip->alloc_blocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 res = hfsplus_file_extend(inode);
236 if (res)
237 return res;
238 }
239 } else
240 create = 0;
241
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200242 if (ablock < hip->first_blocks) {
243 dblock = hfsplus_ext_find_block(hip->first_extents, ablock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 goto done;
245 }
246
Eric Sesterhenn248736c2008-10-18 20:28:02 -0700247 if (inode->i_ino == HFSPLUS_EXT_CNID)
248 return -EIO;
249
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200250 mutex_lock(&hip->extents_lock);
Christoph Hellwige3494702010-11-23 14:38:15 +0100251
252 /*
253 * hfsplus_ext_read_extent will write out a cached extent into
254 * the extents btree. In that case we may have to mark the inode
255 * dirty even for a pure read of an extent here.
256 */
257 was_dirty = (hip->extent_state & HFSPLUS_EXT_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 res = hfsplus_ext_read_extent(inode, ablock);
Christoph Hellwige3494702010-11-23 14:38:15 +0100259 if (res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200260 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return -EIO;
262 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100263 dblock = hfsplus_ext_find_block(hip->cached_extents,
264 ablock - hip->cached_start);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200265 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267done:
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200268 dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n",
269 inode->i_ino, (long long)iblock, dblock);
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100270
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200271 mask = (1 << sbi->fs_shift) - 1;
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100272 sector = ((sector_t)dblock << sbi->fs_shift) +
273 sbi->blockoffset + (iblock & mask);
274 map_bh(bh_result, sb, sector);
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 if (create) {
277 set_buffer_new(bh_result);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200278 hip->phys_size += sb->s_blocksize;
279 hip->fs_blocks++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 inode_add_bytes(inode, sb->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100282 if (create || was_dirty)
283 mark_inode_dirty(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return 0;
285}
286
287static void hfsplus_dump_extent(struct hfsplus_extent *extent)
288{
289 int i;
290
291 dprint(DBG_EXTENT, " ");
292 for (i = 0; i < 8; i++)
293 dprint(DBG_EXTENT, " %u:%u", be32_to_cpu(extent[i].start_block),
294 be32_to_cpu(extent[i].block_count));
295 dprint(DBG_EXTENT, "\n");
296}
297
298static int hfsplus_add_extent(struct hfsplus_extent *extent, u32 offset,
299 u32 alloc_block, u32 block_count)
300{
301 u32 count, start;
302 int i;
303
304 hfsplus_dump_extent(extent);
305 for (i = 0; i < 8; extent++, i++) {
306 count = be32_to_cpu(extent->block_count);
307 if (offset == count) {
308 start = be32_to_cpu(extent->start_block);
309 if (alloc_block != start + count) {
310 if (++i >= 8)
311 return -ENOSPC;
312 extent++;
313 extent->start_block = cpu_to_be32(alloc_block);
314 } else
315 block_count += count;
316 extent->block_count = cpu_to_be32(block_count);
317 return 0;
318 } else if (offset < count)
319 break;
320 offset -= count;
321 }
322 /* panic? */
323 return -EIO;
324}
325
326static int hfsplus_free_extents(struct super_block *sb,
327 struct hfsplus_extent *extent,
328 u32 offset, u32 block_nr)
329{
330 u32 count, start;
331 int i;
332
333 hfsplus_dump_extent(extent);
334 for (i = 0; i < 8; extent++, i++) {
335 count = be32_to_cpu(extent->block_count);
336 if (offset == count)
337 goto found;
338 else if (offset < count)
339 break;
340 offset -= count;
341 }
342 /* panic? */
343 return -EIO;
344found:
345 for (;;) {
346 start = be32_to_cpu(extent->start_block);
347 if (count <= block_nr) {
348 hfsplus_block_free(sb, start, count);
349 extent->block_count = 0;
350 extent->start_block = 0;
351 block_nr -= count;
352 } else {
353 count -= block_nr;
354 hfsplus_block_free(sb, start + count, block_nr);
355 extent->block_count = cpu_to_be32(count);
356 block_nr = 0;
357 }
358 if (!block_nr || !i)
359 return 0;
360 i--;
361 extent--;
362 count = be32_to_cpu(extent->block_count);
363 }
364}
365
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200366int hfsplus_free_fork(struct super_block *sb, u32 cnid,
367 struct hfsplus_fork_raw *fork, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 struct hfs_find_data fd;
370 hfsplus_extent_rec ext_entry;
371 u32 total_blocks, blocks, start;
372 int res, i;
373
374 total_blocks = be32_to_cpu(fork->total_blocks);
375 if (!total_blocks)
376 return 0;
377
378 blocks = 0;
379 for (i = 0; i < 8; i++)
380 blocks += be32_to_cpu(fork->extents[i].block_count);
381
382 res = hfsplus_free_extents(sb, fork->extents, blocks, blocks);
383 if (res)
384 return res;
385 if (total_blocks == blocks)
386 return 0;
387
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400388 res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
389 if (res)
390 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 do {
392 res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
393 total_blocks, type);
394 if (res)
395 break;
396 start = be32_to_cpu(fd.key->ext.start_block);
397 hfsplus_free_extents(sb, ext_entry,
398 total_blocks - start,
399 total_blocks);
400 hfs_brec_remove(&fd);
401 total_blocks = start;
402 } while (total_blocks > blocks);
403 hfs_find_exit(&fd);
404
405 return res;
406}
407
408int hfsplus_file_extend(struct inode *inode)
409{
410 struct super_block *sb = inode->i_sb;
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200411 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200412 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 u32 start, len, goal;
414 int res;
415
Christoph Hellwig1065348d2011-02-02 09:40:33 -0700416 if (sbi->alloc_file->i_size * 8 <
417 sbi->total_blocks - sbi->free_blocks + 8) {
Anton Salikhmetov21f22962010-12-16 18:08:39 +0200418 /* extend alloc file */
Anton Salikhmetovb2837fc2010-12-16 18:08:41 +0200419 printk(KERN_ERR "hfs: extend alloc file! "
420 "(%llu,%u,%u)\n",
421 sbi->alloc_file->i_size * 8,
422 sbi->total_blocks, sbi->free_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return -ENOSPC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
425
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200426 mutex_lock(&hip->extents_lock);
427 if (hip->alloc_blocks == hip->first_blocks)
428 goal = hfsplus_ext_lastblock(hip->first_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200430 res = hfsplus_ext_read_extent(inode, hip->alloc_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (res)
432 goto out;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200433 goal = hfsplus_ext_lastblock(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 }
435
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200436 len = hip->clump_blocks;
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200437 start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len);
438 if (start >= sbi->total_blocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 start = hfsplus_block_allocate(sb, goal, 0, &len);
440 if (start >= goal) {
441 res = -ENOSPC;
442 goto out;
443 }
444 }
445
446 dprint(DBG_EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200447
448 if (hip->alloc_blocks <= hip->first_blocks) {
449 if (!hip->first_blocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 dprint(DBG_EXTENT, "first extents\n");
451 /* no extents yet */
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200452 hip->first_extents[0].start_block = cpu_to_be32(start);
453 hip->first_extents[0].block_count = cpu_to_be32(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 res = 0;
455 } else {
456 /* try to append to extents in inode */
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200457 res = hfsplus_add_extent(hip->first_extents,
458 hip->alloc_blocks,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 start, len);
460 if (res == -ENOSPC)
461 goto insert_extent;
462 }
463 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200464 hfsplus_dump_extent(hip->first_extents);
465 hip->first_blocks += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467 } else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200468 res = hfsplus_add_extent(hip->cached_extents,
469 hip->alloc_blocks - hip->cached_start,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 start, len);
471 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200472 hfsplus_dump_extent(hip->cached_extents);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100473 hip->extent_state |= HFSPLUS_EXT_DIRTY;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200474 hip->cached_blocks += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 } else if (res == -ENOSPC)
476 goto insert_extent;
477 }
478out:
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200479 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200481 hip->alloc_blocks += len;
Christoph Hellwige3494702010-11-23 14:38:15 +0100482 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 }
484 return res;
485
486insert_extent:
487 dprint(DBG_EXTENT, "insert new extent\n");
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400488 res = hfsplus_ext_write_extent_locked(inode);
489 if (res)
490 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200492 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
493 hip->cached_extents[0].start_block = cpu_to_be32(start);
494 hip->cached_extents[0].block_count = cpu_to_be32(len);
495 hfsplus_dump_extent(hip->cached_extents);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100496 hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200497 hip->cached_start = hip->alloc_blocks;
498 hip->cached_blocks = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 res = 0;
501 goto out;
502}
503
504void hfsplus_file_truncate(struct inode *inode)
505{
506 struct super_block *sb = inode->i_sb;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200507 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 struct hfs_find_data fd;
509 u32 alloc_cnt, blk_cnt, start;
510 int res;
511
Anton Salikhmetovb2837fc2010-12-16 18:08:41 +0200512 dprint(DBG_INODE, "truncate: %lu, %llu -> %llu\n",
513 inode->i_ino, (long long)hip->phys_size,
514 inode->i_size);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200515
516 if (inode->i_size > hip->phys_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 struct address_space *mapping = inode->i_mapping;
518 struct page *page;
Nick Piggin7c0efc62007-10-16 01:25:09 -0700519 void *fsdata;
520 u32 size = inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Nick Piggin7c0efc62007-10-16 01:25:09 -0700522 res = pagecache_write_begin(NULL, mapping, size, 0,
523 AOP_FLAG_UNINTERRUPTIBLE,
524 &page, &fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (res)
Nick Piggin7c0efc62007-10-16 01:25:09 -0700526 return;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200527 res = pagecache_write_end(NULL, mapping, size,
528 0, 0, page, fsdata);
Nick Piggin7c0efc62007-10-16 01:25:09 -0700529 if (res < 0)
530 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 mark_inode_dirty(inode);
532 return;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200533 } else if (inode->i_size == hip->phys_size)
Roman Zippelf76d28d2005-08-01 21:11:40 -0700534 return;
535
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200536 blk_cnt = (inode->i_size + HFSPLUS_SB(sb)->alloc_blksz - 1) >>
537 HFSPLUS_SB(sb)->alloc_blksz_shift;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200538 alloc_cnt = hip->alloc_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (blk_cnt == alloc_cnt)
540 goto out;
541
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200542 mutex_lock(&hip->extents_lock);
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400543 res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
544 if (res) {
545 mutex_unlock(&hip->extents_lock);
546 /* XXX: We lack error handling of hfsplus_file_truncate() */
547 return;
548 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 while (1) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200550 if (alloc_cnt == hip->first_blocks) {
551 hfsplus_free_extents(sb, hip->first_extents,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 alloc_cnt, alloc_cnt - blk_cnt);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200553 hfsplus_dump_extent(hip->first_extents);
554 hip->first_blocks = blk_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 break;
556 }
557 res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
558 if (res)
559 break;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200560 start = hip->cached_start;
561 hfsplus_free_extents(sb, hip->cached_extents,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 alloc_cnt - start, alloc_cnt - blk_cnt);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200563 hfsplus_dump_extent(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 if (blk_cnt > start) {
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100565 hip->extent_state |= HFSPLUS_EXT_DIRTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 break;
567 }
568 alloc_cnt = start;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200569 hip->cached_start = hip->cached_blocks = 0;
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100570 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 hfs_brec_remove(&fd);
572 }
573 hfs_find_exit(&fd);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200574 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200576 hip->alloc_blocks = blk_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577out:
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200578 hip->phys_size = inode->i_size;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200579 hip->fs_blocks = (inode->i_size + sb->s_blocksize - 1) >>
580 sb->s_blocksize_bits;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200581 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
Christoph Hellwige3494702010-11-23 14:38:15 +0100582 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}