blob: e8770935ce6d8588fc636661485c2fe23a3bafad [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/fs/hfsplus/extents.c
4 *
5 * Copyright (C) 2001
6 * Brad Boyer (flar@allandria.com)
7 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 *
9 * Handling of Extents both in catalog and extents overflow trees
10 */
11
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include "hfsplus_fs.h"
17#include "hfsplus_raw.h"
18
19/* Compare two extents keys, returns 0 on same, pos/neg for difference */
David Elliott2179d372006-01-18 17:43:08 -080020int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
21 const hfsplus_btree_key *k2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
23 __be32 k1id, k2id;
24 __be32 k1s, k2s;
25
26 k1id = k1->ext.cnid;
27 k2id = k2->ext.cnid;
28 if (k1id != k2id)
29 return be32_to_cpu(k1id) < be32_to_cpu(k2id) ? -1 : 1;
30
31 if (k1->ext.fork_type != k2->ext.fork_type)
32 return k1->ext.fork_type < k2->ext.fork_type ? -1 : 1;
33
34 k1s = k1->ext.start_block;
35 k2s = k2->ext.start_block;
36 if (k1s == k2s)
37 return 0;
38 return be32_to_cpu(k1s) < be32_to_cpu(k2s) ? -1 : 1;
39}
40
41static void hfsplus_ext_build_key(hfsplus_btree_key *key, u32 cnid,
42 u32 block, u8 type)
43{
44 key->key_len = cpu_to_be16(HFSPLUS_EXT_KEYLEN - 2);
45 key->ext.cnid = cpu_to_be32(cnid);
46 key->ext.start_block = cpu_to_be32(block);
47 key->ext.fork_type = type;
48 key->ext.pad = 0;
49}
50
51static u32 hfsplus_ext_find_block(struct hfsplus_extent *ext, u32 off)
52{
53 int i;
54 u32 count;
55
56 for (i = 0; i < 8; ext++, i++) {
57 count = be32_to_cpu(ext->block_count);
58 if (off < count)
59 return be32_to_cpu(ext->start_block) + off;
60 off -= count;
61 }
62 /* panic? */
63 return 0;
64}
65
66static int hfsplus_ext_block_count(struct hfsplus_extent *ext)
67{
68 int i;
69 u32 count = 0;
70
71 for (i = 0; i < 8; ext++, i++)
72 count += be32_to_cpu(ext->block_count);
73 return count;
74}
75
76static u32 hfsplus_ext_lastblock(struct hfsplus_extent *ext)
77{
78 int i;
79
80 ext += 7;
81 for (i = 0; i < 7; ext--, i++)
82 if (ext->block_count)
83 break;
84 return be32_to_cpu(ext->start_block) + be32_to_cpu(ext->block_count);
85}
86
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -070087static int __hfsplus_ext_write_extent(struct inode *inode,
Anton Salikhmetov2753cc22010-12-16 18:08:38 +020088 struct hfs_find_data *fd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Christoph Hellwig6af502d2010-10-01 05:43:31 +020090 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 int res;
92
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +020093 WARN_ON(!mutex_is_locked(&hip->extents_lock));
94
Christoph Hellwig6af502d2010-10-01 05:43:31 +020095 hfsplus_ext_build_key(fd->search_key, inode->i_ino, hip->cached_start,
96 HFSPLUS_IS_RSRC(inode) ?
97 HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA);
98
Vyacheslav Dubeyko324ef392013-02-27 17:03:04 -080099 res = hfs_brec_find(fd, hfs_find_rec_by_key);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100100 if (hip->extent_state & HFSPLUS_EXT_NEW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (res != -ENOENT)
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700102 return res;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200103 hfs_brec_insert(fd, hip->cached_extents,
104 sizeof(hfsplus_extent_rec));
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100105 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 } else {
107 if (res)
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700108 return res;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200109 hfs_bnode_write(fd->bnode, hip->cached_extents,
110 fd->entryoffset, fd->entrylength);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100111 hip->extent_state &= ~HFSPLUS_EXT_DIRTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100113
114 /*
115 * We can't just use hfsplus_mark_inode_dirty here, because we
116 * also get called from hfsplus_write_inode, which should not
117 * redirty the inode. Instead the callers have to be careful
118 * to explicily mark the inode dirty, too.
119 */
120 set_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags);
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700121
122 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400125static int hfsplus_ext_write_extent_locked(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700127 int res = 0;
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400128
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100129 if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 struct hfs_find_data fd;
131
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400132 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
133 if (res)
134 return res;
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700135 res = __hfsplus_ext_write_extent(inode, &fd);
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400136 hfs_find_exit(&fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700138 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
140
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400141int hfsplus_ext_write_extent(struct inode *inode)
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200142{
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400143 int res;
144
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200145 mutex_lock(&HFSPLUS_I(inode)->extents_lock);
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400146 res = hfsplus_ext_write_extent_locked(inode);
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200147 mutex_unlock(&HFSPLUS_I(inode)->extents_lock);
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400148
149 return res;
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200150}
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd,
153 struct hfsplus_extent *extent,
154 u32 cnid, u32 block, u8 type)
155{
156 int res;
157
158 hfsplus_ext_build_key(fd->search_key, cnid, block, type);
159 fd->key->ext.cnid = 0;
Vyacheslav Dubeyko324ef392013-02-27 17:03:04 -0800160 res = hfs_brec_find(fd, hfs_find_rec_by_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (res && res != -ENOENT)
162 return res;
163 if (fd->key->ext.cnid != fd->search_key->ext.cnid ||
164 fd->key->ext.fork_type != fd->search_key->ext.fork_type)
165 return -ENOENT;
166 if (fd->entrylength != sizeof(hfsplus_extent_rec))
167 return -EIO;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200168 hfs_bnode_read(fd->bnode, extent, fd->entryoffset,
169 sizeof(hfsplus_extent_rec));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return 0;
171}
172
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200173static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd,
174 struct inode *inode, u32 block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200176 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 int res;
178
Christoph Hellwig7fcc99f2010-10-01 05:46:31 +0200179 WARN_ON(!mutex_is_locked(&hip->extents_lock));
180
Alexey Khoroshilovd7a475d2013-04-30 15:27:56 -0700181 if (hip->extent_state & HFSPLUS_EXT_DIRTY) {
182 res = __hfsplus_ext_write_extent(inode, fd);
183 if (res)
184 return res;
185 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200187 res = __hfsplus_ext_read_extent(fd, hip->cached_extents, inode->i_ino,
188 block, HFSPLUS_IS_RSRC(inode) ?
189 HFSPLUS_TYPE_RSRC :
190 HFSPLUS_TYPE_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200192 hip->cached_start = be32_to_cpu(fd->key->ext.start_block);
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200193 hip->cached_blocks =
194 hfsplus_ext_block_count(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 } else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200196 hip->cached_start = hip->cached_blocks = 0;
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100197 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
199 return res;
200}
201
202static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
203{
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200204 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 struct hfs_find_data fd;
206 int res;
207
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200208 if (block >= hip->cached_start &&
209 block < hip->cached_start + hip->cached_blocks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return 0;
211
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400212 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
213 if (!res) {
214 res = __hfsplus_ext_cache_extent(&fd, inode, block);
215 hfs_find_exit(&fd);
216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 return res;
218}
219
220/* Get a block at iblock for inode, possibly allocating if create */
221int hfsplus_get_block(struct inode *inode, sector_t iblock,
222 struct buffer_head *bh_result, int create)
223{
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200224 struct super_block *sb = inode->i_sb;
225 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200226 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 int res = -EIO;
228 u32 ablock, dblock, mask;
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100229 sector_t sector;
Christoph Hellwige3494702010-11-23 14:38:15 +0100230 int was_dirty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 /* Convert inode block to disk allocation block */
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200233 ablock = iblock >> sbi->fs_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200235 if (iblock >= hip->fs_blocks) {
236 if (iblock > hip->fs_blocks || !create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return -EIO;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200238 if (ablock >= hip->alloc_blocks) {
Sergei Antonov2cd282a2014-06-06 14:36:28 -0700239 res = hfsplus_file_extend(inode, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (res)
241 return res;
242 }
243 } else
244 create = 0;
245
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200246 if (ablock < hip->first_blocks) {
247 dblock = hfsplus_ext_find_block(hip->first_extents, ablock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 goto done;
249 }
250
Eric Sesterhenn248736c2008-10-18 20:28:02 -0700251 if (inode->i_ino == HFSPLUS_EXT_CNID)
252 return -EIO;
253
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200254 mutex_lock(&hip->extents_lock);
Christoph Hellwige3494702010-11-23 14:38:15 +0100255
256 /*
257 * hfsplus_ext_read_extent will write out a cached extent into
258 * the extents btree. In that case we may have to mark the inode
259 * dirty even for a pure read of an extent here.
260 */
261 was_dirty = (hip->extent_state & HFSPLUS_EXT_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 res = hfsplus_ext_read_extent(inode, ablock);
Christoph Hellwige3494702010-11-23 14:38:15 +0100263 if (res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200264 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return -EIO;
266 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100267 dblock = hfsplus_ext_find_block(hip->cached_extents,
268 ablock - hip->cached_start);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200269 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271done:
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700272 hfs_dbg(EXTENT, "get_block(%lu): %llu - %u\n",
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200273 inode->i_ino, (long long)iblock, dblock);
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100274
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200275 mask = (1 << sbi->fs_shift) - 1;
Christoph Hellwigbf1a1b32011-02-16 09:34:17 +0100276 sector = ((sector_t)dblock << sbi->fs_shift) +
277 sbi->blockoffset + (iblock & mask);
278 map_bh(bh_result, sb, sector);
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (create) {
281 set_buffer_new(bh_result);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200282 hip->phys_size += sb->s_blocksize;
283 hip->fs_blocks++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 inode_add_bytes(inode, sb->s_blocksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
Christoph Hellwige3494702010-11-23 14:38:15 +0100286 if (create || was_dirty)
287 mark_inode_dirty(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return 0;
289}
290
291static void hfsplus_dump_extent(struct hfsplus_extent *extent)
292{
293 int i;
294
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700295 hfs_dbg(EXTENT, " ");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 for (i = 0; i < 8; i++)
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700297 hfs_dbg_cont(EXTENT, " %u:%u",
298 be32_to_cpu(extent[i].start_block),
299 be32_to_cpu(extent[i].block_count));
300 hfs_dbg_cont(EXTENT, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
303static int hfsplus_add_extent(struct hfsplus_extent *extent, u32 offset,
304 u32 alloc_block, u32 block_count)
305{
306 u32 count, start;
307 int i;
308
309 hfsplus_dump_extent(extent);
310 for (i = 0; i < 8; extent++, i++) {
311 count = be32_to_cpu(extent->block_count);
312 if (offset == count) {
313 start = be32_to_cpu(extent->start_block);
314 if (alloc_block != start + count) {
315 if (++i >= 8)
316 return -ENOSPC;
317 extent++;
318 extent->start_block = cpu_to_be32(alloc_block);
319 } else
320 block_count += count;
321 extent->block_count = cpu_to_be32(block_count);
322 return 0;
323 } else if (offset < count)
324 break;
325 offset -= count;
326 }
327 /* panic? */
328 return -EIO;
329}
330
331static int hfsplus_free_extents(struct super_block *sb,
332 struct hfsplus_extent *extent,
333 u32 offset, u32 block_nr)
334{
335 u32 count, start;
336 int i;
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800337 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 hfsplus_dump_extent(extent);
340 for (i = 0; i < 8; extent++, i++) {
341 count = be32_to_cpu(extent->block_count);
342 if (offset == count)
343 goto found;
344 else if (offset < count)
345 break;
346 offset -= count;
347 }
348 /* panic? */
349 return -EIO;
350found:
351 for (;;) {
352 start = be32_to_cpu(extent->start_block);
353 if (count <= block_nr) {
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800354 err = hfsplus_block_free(sb, start, count);
355 if (err) {
Joe Perchesd61426732013-04-30 15:27:55 -0700356 pr_err("can't free extent\n");
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700357 hfs_dbg(EXTENT, " start: %u count: %u\n",
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800358 start, count);
359 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 extent->block_count = 0;
361 extent->start_block = 0;
362 block_nr -= count;
363 } else {
364 count -= block_nr;
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800365 err = hfsplus_block_free(sb, start + count, block_nr);
366 if (err) {
Joe Perchesd61426732013-04-30 15:27:55 -0700367 pr_err("can't free extent\n");
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700368 hfs_dbg(EXTENT, " start: %u count: %u\n",
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800369 start, count);
370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 extent->block_count = cpu_to_be32(count);
372 block_nr = 0;
373 }
Vyacheslav Dubeyko1b243fd2012-12-20 15:05:25 -0800374 if (!block_nr || !i) {
375 /*
376 * Try to free all extents and
377 * return only last error
378 */
379 return err;
380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 i--;
382 extent--;
383 count = be32_to_cpu(extent->block_count);
384 }
385}
386
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200387int hfsplus_free_fork(struct super_block *sb, u32 cnid,
388 struct hfsplus_fork_raw *fork, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
390 struct hfs_find_data fd;
391 hfsplus_extent_rec ext_entry;
392 u32 total_blocks, blocks, start;
393 int res, i;
394
395 total_blocks = be32_to_cpu(fork->total_blocks);
396 if (!total_blocks)
397 return 0;
398
399 blocks = 0;
400 for (i = 0; i < 8; i++)
401 blocks += be32_to_cpu(fork->extents[i].block_count);
402
403 res = hfsplus_free_extents(sb, fork->extents, blocks, blocks);
404 if (res)
405 return res;
406 if (total_blocks == blocks)
407 return 0;
408
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400409 res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
410 if (res)
411 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 do {
413 res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
414 total_blocks, type);
415 if (res)
416 break;
417 start = be32_to_cpu(fd.key->ext.start_block);
418 hfsplus_free_extents(sb, ext_entry,
419 total_blocks - start,
420 total_blocks);
421 hfs_brec_remove(&fd);
422 total_blocks = start;
423 } while (total_blocks > blocks);
424 hfs_find_exit(&fd);
425
426 return res;
427}
428
Sergei Antonov2cd282a2014-06-06 14:36:28 -0700429int hfsplus_file_extend(struct inode *inode, bool zeroout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
431 struct super_block *sb = inode->i_sb;
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200432 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200433 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 u32 start, len, goal;
435 int res;
436
Christoph Hellwig1065348d2011-02-02 09:40:33 -0700437 if (sbi->alloc_file->i_size * 8 <
438 sbi->total_blocks - sbi->free_blocks + 8) {
Anton Salikhmetov21f22962010-12-16 18:08:39 +0200439 /* extend alloc file */
Fabian Frederickb73f3d02014-06-06 14:36:31 -0700440 pr_err("extend alloc file! (%llu,%u,%u)\n",
441 sbi->alloc_file->i_size * 8,
442 sbi->total_blocks, sbi->free_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 return -ENOSPC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 }
445
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200446 mutex_lock(&hip->extents_lock);
447 if (hip->alloc_blocks == hip->first_blocks)
448 goal = hfsplus_ext_lastblock(hip->first_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200450 res = hfsplus_ext_read_extent(inode, hip->alloc_blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if (res)
452 goto out;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200453 goal = hfsplus_ext_lastblock(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
455
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200456 len = hip->clump_blocks;
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200457 start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len);
458 if (start >= sbi->total_blocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 start = hfsplus_block_allocate(sb, goal, 0, &len);
460 if (start >= goal) {
461 res = -ENOSPC;
462 goto out;
463 }
464 }
465
Sergei Antonov2cd282a2014-06-06 14:36:28 -0700466 if (zeroout) {
467 res = sb_issue_zeroout(sb, start, len, GFP_NOFS);
468 if (res)
469 goto out;
470 }
471
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700472 hfs_dbg(EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200473
474 if (hip->alloc_blocks <= hip->first_blocks) {
475 if (!hip->first_blocks) {
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700476 hfs_dbg(EXTENT, "first extents\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 /* no extents yet */
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200478 hip->first_extents[0].start_block = cpu_to_be32(start);
479 hip->first_extents[0].block_count = cpu_to_be32(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 res = 0;
481 } else {
482 /* try to append to extents in inode */
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200483 res = hfsplus_add_extent(hip->first_extents,
484 hip->alloc_blocks,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 start, len);
486 if (res == -ENOSPC)
487 goto insert_extent;
488 }
489 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200490 hfsplus_dump_extent(hip->first_extents);
491 hip->first_blocks += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 }
493 } else {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200494 res = hfsplus_add_extent(hip->cached_extents,
495 hip->alloc_blocks - hip->cached_start,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 start, len);
497 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200498 hfsplus_dump_extent(hip->cached_extents);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100499 hip->extent_state |= HFSPLUS_EXT_DIRTY;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200500 hip->cached_blocks += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 } else if (res == -ENOSPC)
502 goto insert_extent;
503 }
504out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (!res) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200506 hip->alloc_blocks += len;
Sougata Santrad7bdb9962014-04-03 14:50:34 -0700507 mutex_unlock(&hip->extents_lock);
Christoph Hellwige3494702010-11-23 14:38:15 +0100508 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
Sougata Santrad7bdb9962014-04-03 14:50:34 -0700509 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 }
Sougata Santrad7bdb9962014-04-03 14:50:34 -0700511 mutex_unlock(&hip->extents_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 return res;
513
514insert_extent:
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700515 hfs_dbg(EXTENT, "insert new extent\n");
Alexey Khoroshilovdd7f3d52011-07-06 02:30:00 +0400516 res = hfsplus_ext_write_extent_locked(inode);
517 if (res)
518 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200520 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
521 hip->cached_extents[0].start_block = cpu_to_be32(start);
522 hip->cached_extents[0].block_count = cpu_to_be32(len);
523 hfsplus_dump_extent(hip->cached_extents);
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100524 hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200525 hip->cached_start = hip->alloc_blocks;
526 hip->cached_blocks = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 res = 0;
529 goto out;
530}
531
532void hfsplus_file_truncate(struct inode *inode)
533{
534 struct super_block *sb = inode->i_sb;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200535 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 struct hfs_find_data fd;
537 u32 alloc_cnt, blk_cnt, start;
538 int res;
539
Joe Perchesc2b3e1f2013-04-30 15:27:54 -0700540 hfs_dbg(INODE, "truncate: %lu, %llu -> %llu\n",
541 inode->i_ino, (long long)hip->phys_size, inode->i_size);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200542
543 if (inode->i_size > hip->phys_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 struct address_space *mapping = inode->i_mapping;
545 struct page *page;
Nick Piggin7c0efc62007-10-16 01:25:09 -0700546 void *fsdata;
Vyacheslav Dubeyko12f267a2013-04-17 15:58:33 -0700547 loff_t size = inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Tetsuo Handac718a972017-05-08 15:58:59 -0700549 res = pagecache_write_begin(NULL, mapping, size, 0, 0,
550 &page, &fsdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (res)
Nick Piggin7c0efc62007-10-16 01:25:09 -0700552 return;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200553 res = pagecache_write_end(NULL, mapping, size,
554 0, 0, page, fsdata);
Nick Piggin7c0efc62007-10-16 01:25:09 -0700555 if (res < 0)
556 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 mark_inode_dirty(inode);
558 return;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200559 } else if (inode->i_size == hip->phys_size)
Roman Zippelf76d28d2005-08-01 21:11:40 -0700560 return;
561
Christoph Hellwigdd73a012010-10-01 05:42:59 +0200562 blk_cnt = (inode->i_size + HFSPLUS_SB(sb)->alloc_blksz - 1) >>
563 HFSPLUS_SB(sb)->alloc_blksz_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200565 mutex_lock(&hip->extents_lock);
Sougata Santrad7bdb9962014-04-03 14:50:34 -0700566
567 alloc_cnt = hip->alloc_blocks;
568 if (blk_cnt == alloc_cnt)
569 goto out_unlock;
570
Alexey Khoroshilov5bd9d992011-07-06 02:29:59 +0400571 res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
572 if (res) {
573 mutex_unlock(&hip->extents_lock);
574 /* XXX: We lack error handling of hfsplus_file_truncate() */
575 return;
576 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 while (1) {
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200578 if (alloc_cnt == hip->first_blocks) {
579 hfsplus_free_extents(sb, hip->first_extents,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 alloc_cnt, alloc_cnt - blk_cnt);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200581 hfsplus_dump_extent(hip->first_extents);
582 hip->first_blocks = blk_cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 break;
584 }
585 res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt);
586 if (res)
587 break;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200588 start = hip->cached_start;
589 hfsplus_free_extents(sb, hip->cached_extents,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 alloc_cnt - start, alloc_cnt - blk_cnt);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200591 hfsplus_dump_extent(hip->cached_extents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (blk_cnt > start) {
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100593 hip->extent_state |= HFSPLUS_EXT_DIRTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 break;
595 }
596 alloc_cnt = start;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200597 hip->cached_start = hip->cached_blocks = 0;
Christoph Hellwigb33b7922010-11-23 14:38:13 +0100598 hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 hfs_brec_remove(&fd);
600 }
601 hfs_find_exit(&fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200603 hip->alloc_blocks = blk_cnt;
Sougata Santrad7bdb9962014-04-03 14:50:34 -0700604out_unlock:
605 mutex_unlock(&hip->extents_lock);
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200606 hip->phys_size = inode->i_size;
Anton Salikhmetov2753cc22010-12-16 18:08:38 +0200607 hip->fs_blocks = (inode->i_size + sb->s_blocksize - 1) >>
608 sb->s_blocksize_bits;
Christoph Hellwig6af502d2010-10-01 05:43:31 +0200609 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
Christoph Hellwige3494702010-11-23 14:38:15 +0100610 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611}