Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
| 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 Elliott | 2179d37 | 2006-01-18 17:43:08 -0800 | [diff] [blame] | 19 | int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1, |
| 20 | const hfsplus_btree_key *k2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | { |
| 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 | |
| 40 | static 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 | |
| 50 | static 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 | |
| 65 | static 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 | |
| 75 | static 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 Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 86 | static void __hfsplus_ext_write_extent(struct inode *inode, |
| 87 | struct hfs_find_data *fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 89 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | int res; |
| 91 | |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 92 | WARN_ON(!mutex_is_locked(&hip->extents_lock)); |
| 93 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 94 | 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 | |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 98 | res = hfs_brec_find(fd, hfs_find_rec_by_key); |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 99 | if (hip->extent_state & HFSPLUS_EXT_NEW) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | if (res != -ENOENT) |
| 101 | return; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 102 | hfs_brec_insert(fd, hip->cached_extents, |
| 103 | sizeof(hfsplus_extent_rec)); |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 104 | hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } else { |
| 106 | if (res) |
| 107 | return; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 108 | hfs_bnode_write(fd->bnode, hip->cached_extents, |
| 109 | fd->entryoffset, fd->entrylength); |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 110 | hip->extent_state &= ~HFSPLUS_EXT_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 112 | |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 122 | static int hfsplus_ext_write_extent_locked(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 124 | int res; |
| 125 | |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 126 | if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | struct hfs_find_data fd; |
| 128 | |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 129 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 135 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 138 | int hfsplus_ext_write_extent(struct inode *inode) |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 139 | { |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 140 | int res; |
| 141 | |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 142 | mutex_lock(&HFSPLUS_I(inode)->extents_lock); |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 143 | res = hfsplus_ext_write_extent_locked(inode); |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 144 | mutex_unlock(&HFSPLUS_I(inode)->extents_lock); |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 145 | |
| 146 | return res; |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 147 | } |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | static 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; |
Vyacheslav Dubeyko | 324ef39 | 2013-02-27 17:03:04 -0800 | [diff] [blame] | 157 | res = hfs_brec_find(fd, hfs_find_rec_by_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 165 | hfs_bnode_read(fd->bnode, extent, fd->entryoffset, |
| 166 | sizeof(hfsplus_extent_rec)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | return 0; |
| 168 | } |
| 169 | |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 170 | static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, |
| 171 | struct inode *inode, u32 block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 173 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | int res; |
| 175 | |
Christoph Hellwig | 7fcc99f | 2010-10-01 05:46:31 +0200 | [diff] [blame] | 176 | WARN_ON(!mutex_is_locked(&hip->extents_lock)); |
| 177 | |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 178 | if (hip->extent_state & HFSPLUS_EXT_DIRTY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | __hfsplus_ext_write_extent(inode, fd); |
| 180 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 181 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | if (!res) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 186 | hip->cached_start = be32_to_cpu(fd->key->ext.start_block); |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 187 | hip->cached_blocks = |
| 188 | hfsplus_ext_block_count(hip->cached_extents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } else { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 190 | hip->cached_start = hip->cached_blocks = 0; |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 191 | hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | return res; |
| 194 | } |
| 195 | |
| 196 | static int hfsplus_ext_read_extent(struct inode *inode, u32 block) |
| 197 | { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 198 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | struct hfs_find_data fd; |
| 200 | int res; |
| 201 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 202 | if (block >= hip->cached_start && |
| 203 | block < hip->cached_start + hip->cached_blocks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | return 0; |
| 205 | |
Alexey Khoroshilov | 5bd9d99 | 2011-07-06 02:29:59 +0400 | [diff] [blame] | 206 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return res; |
| 212 | } |
| 213 | |
| 214 | /* Get a block at iblock for inode, possibly allocating if create */ |
| 215 | int hfsplus_get_block(struct inode *inode, sector_t iblock, |
| 216 | struct buffer_head *bh_result, int create) |
| 217 | { |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 218 | struct super_block *sb = inode->i_sb; |
| 219 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 220 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | int res = -EIO; |
| 222 | u32 ablock, dblock, mask; |
Christoph Hellwig | bf1a1b3 | 2011-02-16 09:34:17 +0100 | [diff] [blame] | 223 | sector_t sector; |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 224 | int was_dirty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | int shift; |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | /* Convert inode block to disk allocation block */ |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 228 | shift = sbi->alloc_blksz_shift - sb->s_blocksize_bits; |
| 229 | ablock = iblock >> sbi->fs_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 231 | if (iblock >= hip->fs_blocks) { |
| 232 | if (iblock > hip->fs_blocks || !create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | return -EIO; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 234 | if (ablock >= hip->alloc_blocks) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | res = hfsplus_file_extend(inode); |
| 236 | if (res) |
| 237 | return res; |
| 238 | } |
| 239 | } else |
| 240 | create = 0; |
| 241 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 242 | if (ablock < hip->first_blocks) { |
| 243 | dblock = hfsplus_ext_find_block(hip->first_extents, ablock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | goto done; |
| 245 | } |
| 246 | |
Eric Sesterhenn | 248736c | 2008-10-18 20:28:02 -0700 | [diff] [blame] | 247 | if (inode->i_ino == HFSPLUS_EXT_CNID) |
| 248 | return -EIO; |
| 249 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 250 | mutex_lock(&hip->extents_lock); |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 251 | |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | res = hfsplus_ext_read_extent(inode, ablock); |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 259 | if (res) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 260 | mutex_unlock(&hip->extents_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | return -EIO; |
| 262 | } |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 263 | dblock = hfsplus_ext_find_block(hip->cached_extents, |
| 264 | ablock - hip->cached_start); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 265 | mutex_unlock(&hip->extents_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | done: |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 268 | dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n", |
| 269 | inode->i_ino, (long long)iblock, dblock); |
Christoph Hellwig | bf1a1b3 | 2011-02-16 09:34:17 +0100 | [diff] [blame] | 270 | |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 271 | mask = (1 << sbi->fs_shift) - 1; |
Christoph Hellwig | bf1a1b3 | 2011-02-16 09:34:17 +0100 | [diff] [blame] | 272 | sector = ((sector_t)dblock << sbi->fs_shift) + |
| 273 | sbi->blockoffset + (iblock & mask); |
| 274 | map_bh(bh_result, sb, sector); |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | if (create) { |
| 277 | set_buffer_new(bh_result); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 278 | hip->phys_size += sb->s_blocksize; |
| 279 | hip->fs_blocks++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | inode_add_bytes(inode, sb->s_blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 282 | if (create || was_dirty) |
| 283 | mark_inode_dirty(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static 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 | |
| 298 | static 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 | |
| 326 | static 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; |
Vyacheslav Dubeyko | 1b243fd | 2012-12-20 15:05:25 -0800 | [diff] [blame] | 332 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | hfsplus_dump_extent(extent); |
| 335 | for (i = 0; i < 8; extent++, i++) { |
| 336 | count = be32_to_cpu(extent->block_count); |
| 337 | if (offset == count) |
| 338 | goto found; |
| 339 | else if (offset < count) |
| 340 | break; |
| 341 | offset -= count; |
| 342 | } |
| 343 | /* panic? */ |
| 344 | return -EIO; |
| 345 | found: |
| 346 | for (;;) { |
| 347 | start = be32_to_cpu(extent->start_block); |
| 348 | if (count <= block_nr) { |
Vyacheslav Dubeyko | 1b243fd | 2012-12-20 15:05:25 -0800 | [diff] [blame] | 349 | err = hfsplus_block_free(sb, start, count); |
| 350 | if (err) { |
| 351 | printk(KERN_ERR "hfs: can't free extent\n"); |
| 352 | dprint(DBG_EXTENT, " start: %u count: %u\n", |
| 353 | start, count); |
| 354 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | extent->block_count = 0; |
| 356 | extent->start_block = 0; |
| 357 | block_nr -= count; |
| 358 | } else { |
| 359 | count -= block_nr; |
Vyacheslav Dubeyko | 1b243fd | 2012-12-20 15:05:25 -0800 | [diff] [blame] | 360 | err = hfsplus_block_free(sb, start + count, block_nr); |
| 361 | if (err) { |
| 362 | printk(KERN_ERR "hfs: can't free extent\n"); |
| 363 | dprint(DBG_EXTENT, " start: %u count: %u\n", |
| 364 | start, count); |
| 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | extent->block_count = cpu_to_be32(count); |
| 367 | block_nr = 0; |
| 368 | } |
Vyacheslav Dubeyko | 1b243fd | 2012-12-20 15:05:25 -0800 | [diff] [blame] | 369 | if (!block_nr || !i) { |
| 370 | /* |
| 371 | * Try to free all extents and |
| 372 | * return only last error |
| 373 | */ |
| 374 | return err; |
| 375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | i--; |
| 377 | extent--; |
| 378 | count = be32_to_cpu(extent->block_count); |
| 379 | } |
| 380 | } |
| 381 | |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 382 | int hfsplus_free_fork(struct super_block *sb, u32 cnid, |
| 383 | struct hfsplus_fork_raw *fork, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
| 385 | struct hfs_find_data fd; |
| 386 | hfsplus_extent_rec ext_entry; |
| 387 | u32 total_blocks, blocks, start; |
| 388 | int res, i; |
| 389 | |
| 390 | total_blocks = be32_to_cpu(fork->total_blocks); |
| 391 | if (!total_blocks) |
| 392 | return 0; |
| 393 | |
| 394 | blocks = 0; |
| 395 | for (i = 0; i < 8; i++) |
| 396 | blocks += be32_to_cpu(fork->extents[i].block_count); |
| 397 | |
| 398 | res = hfsplus_free_extents(sb, fork->extents, blocks, blocks); |
| 399 | if (res) |
| 400 | return res; |
| 401 | if (total_blocks == blocks) |
| 402 | return 0; |
| 403 | |
Alexey Khoroshilov | 5bd9d99 | 2011-07-06 02:29:59 +0400 | [diff] [blame] | 404 | res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd); |
| 405 | if (res) |
| 406 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | do { |
| 408 | res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid, |
| 409 | total_blocks, type); |
| 410 | if (res) |
| 411 | break; |
| 412 | start = be32_to_cpu(fd.key->ext.start_block); |
| 413 | hfsplus_free_extents(sb, ext_entry, |
| 414 | total_blocks - start, |
| 415 | total_blocks); |
| 416 | hfs_brec_remove(&fd); |
| 417 | total_blocks = start; |
| 418 | } while (total_blocks > blocks); |
| 419 | hfs_find_exit(&fd); |
| 420 | |
| 421 | return res; |
| 422 | } |
| 423 | |
| 424 | int hfsplus_file_extend(struct inode *inode) |
| 425 | { |
| 426 | struct super_block *sb = inode->i_sb; |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 427 | struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 428 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | u32 start, len, goal; |
| 430 | int res; |
| 431 | |
Christoph Hellwig | 1065348 | 2011-02-02 09:40:33 -0700 | [diff] [blame] | 432 | if (sbi->alloc_file->i_size * 8 < |
| 433 | sbi->total_blocks - sbi->free_blocks + 8) { |
Anton Salikhmetov | 21f2296 | 2010-12-16 18:08:39 +0200 | [diff] [blame] | 434 | /* extend alloc file */ |
Anton Salikhmetov | b2837fc | 2010-12-16 18:08:41 +0200 | [diff] [blame] | 435 | printk(KERN_ERR "hfs: extend alloc file! " |
| 436 | "(%llu,%u,%u)\n", |
| 437 | sbi->alloc_file->i_size * 8, |
| 438 | sbi->total_blocks, sbi->free_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | return -ENOSPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
| 441 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 442 | mutex_lock(&hip->extents_lock); |
| 443 | if (hip->alloc_blocks == hip->first_blocks) |
| 444 | goal = hfsplus_ext_lastblock(hip->first_extents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | else { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 446 | res = hfsplus_ext_read_extent(inode, hip->alloc_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | if (res) |
| 448 | goto out; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 449 | goal = hfsplus_ext_lastblock(hip->cached_extents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
| 451 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 452 | len = hip->clump_blocks; |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 453 | start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len); |
| 454 | if (start >= sbi->total_blocks) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | start = hfsplus_block_allocate(sb, goal, 0, &len); |
| 456 | if (start >= goal) { |
| 457 | res = -ENOSPC; |
| 458 | goto out; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | dprint(DBG_EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 463 | |
| 464 | if (hip->alloc_blocks <= hip->first_blocks) { |
| 465 | if (!hip->first_blocks) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | dprint(DBG_EXTENT, "first extents\n"); |
| 467 | /* no extents yet */ |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 468 | hip->first_extents[0].start_block = cpu_to_be32(start); |
| 469 | hip->first_extents[0].block_count = cpu_to_be32(len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | res = 0; |
| 471 | } else { |
| 472 | /* try to append to extents in inode */ |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 473 | res = hfsplus_add_extent(hip->first_extents, |
| 474 | hip->alloc_blocks, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | start, len); |
| 476 | if (res == -ENOSPC) |
| 477 | goto insert_extent; |
| 478 | } |
| 479 | if (!res) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 480 | hfsplus_dump_extent(hip->first_extents); |
| 481 | hip->first_blocks += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | } |
| 483 | } else { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 484 | res = hfsplus_add_extent(hip->cached_extents, |
| 485 | hip->alloc_blocks - hip->cached_start, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | start, len); |
| 487 | if (!res) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 488 | hfsplus_dump_extent(hip->cached_extents); |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 489 | hip->extent_state |= HFSPLUS_EXT_DIRTY; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 490 | hip->cached_blocks += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } else if (res == -ENOSPC) |
| 492 | goto insert_extent; |
| 493 | } |
| 494 | out: |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 495 | mutex_unlock(&hip->extents_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | if (!res) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 497 | hip->alloc_blocks += len; |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 498 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | return res; |
| 501 | |
| 502 | insert_extent: |
| 503 | dprint(DBG_EXTENT, "insert new extent\n"); |
Alexey Khoroshilov | dd7f3d5 | 2011-07-06 02:30:00 +0400 | [diff] [blame] | 504 | res = hfsplus_ext_write_extent_locked(inode); |
| 505 | if (res) |
| 506 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 508 | memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); |
| 509 | hip->cached_extents[0].start_block = cpu_to_be32(start); |
| 510 | hip->cached_extents[0].block_count = cpu_to_be32(len); |
| 511 | hfsplus_dump_extent(hip->cached_extents); |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 512 | hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 513 | hip->cached_start = hip->alloc_blocks; |
| 514 | hip->cached_blocks = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | res = 0; |
| 517 | goto out; |
| 518 | } |
| 519 | |
| 520 | void hfsplus_file_truncate(struct inode *inode) |
| 521 | { |
| 522 | struct super_block *sb = inode->i_sb; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 523 | struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | struct hfs_find_data fd; |
| 525 | u32 alloc_cnt, blk_cnt, start; |
| 526 | int res; |
| 527 | |
Anton Salikhmetov | b2837fc | 2010-12-16 18:08:41 +0200 | [diff] [blame] | 528 | dprint(DBG_INODE, "truncate: %lu, %llu -> %llu\n", |
| 529 | inode->i_ino, (long long)hip->phys_size, |
| 530 | inode->i_size); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 531 | |
| 532 | if (inode->i_size > hip->phys_size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | struct address_space *mapping = inode->i_mapping; |
| 534 | struct page *page; |
Nick Piggin | 7c0efc6 | 2007-10-16 01:25:09 -0700 | [diff] [blame] | 535 | void *fsdata; |
Vyacheslav Dubeyko | 12f267a | 2013-04-17 15:58:33 -0700 | [diff] [blame] | 536 | loff_t size = inode->i_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Nick Piggin | 7c0efc6 | 2007-10-16 01:25:09 -0700 | [diff] [blame] | 538 | res = pagecache_write_begin(NULL, mapping, size, 0, |
| 539 | AOP_FLAG_UNINTERRUPTIBLE, |
| 540 | &page, &fsdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | if (res) |
Nick Piggin | 7c0efc6 | 2007-10-16 01:25:09 -0700 | [diff] [blame] | 542 | return; |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 543 | res = pagecache_write_end(NULL, mapping, size, |
| 544 | 0, 0, page, fsdata); |
Nick Piggin | 7c0efc6 | 2007-10-16 01:25:09 -0700 | [diff] [blame] | 545 | if (res < 0) |
| 546 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | mark_inode_dirty(inode); |
| 548 | return; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 549 | } else if (inode->i_size == hip->phys_size) |
Roman Zippel | f76d28d | 2005-08-01 21:11:40 -0700 | [diff] [blame] | 550 | return; |
| 551 | |
Christoph Hellwig | dd73a01 | 2010-10-01 05:42:59 +0200 | [diff] [blame] | 552 | blk_cnt = (inode->i_size + HFSPLUS_SB(sb)->alloc_blksz - 1) >> |
| 553 | HFSPLUS_SB(sb)->alloc_blksz_shift; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 554 | alloc_cnt = hip->alloc_blocks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | if (blk_cnt == alloc_cnt) |
| 556 | goto out; |
| 557 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 558 | mutex_lock(&hip->extents_lock); |
Alexey Khoroshilov | 5bd9d99 | 2011-07-06 02:29:59 +0400 | [diff] [blame] | 559 | res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd); |
| 560 | if (res) { |
| 561 | mutex_unlock(&hip->extents_lock); |
| 562 | /* XXX: We lack error handling of hfsplus_file_truncate() */ |
| 563 | return; |
| 564 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | while (1) { |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 566 | if (alloc_cnt == hip->first_blocks) { |
| 567 | hfsplus_free_extents(sb, hip->first_extents, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | alloc_cnt, alloc_cnt - blk_cnt); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 569 | hfsplus_dump_extent(hip->first_extents); |
| 570 | hip->first_blocks = blk_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | break; |
| 572 | } |
| 573 | res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt); |
| 574 | if (res) |
| 575 | break; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 576 | start = hip->cached_start; |
| 577 | hfsplus_free_extents(sb, hip->cached_extents, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | alloc_cnt - start, alloc_cnt - blk_cnt); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 579 | hfsplus_dump_extent(hip->cached_extents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (blk_cnt > start) { |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 581 | hip->extent_state |= HFSPLUS_EXT_DIRTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | break; |
| 583 | } |
| 584 | alloc_cnt = start; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 585 | hip->cached_start = hip->cached_blocks = 0; |
Christoph Hellwig | b33b792 | 2010-11-23 14:38:13 +0100 | [diff] [blame] | 586 | hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | hfs_brec_remove(&fd); |
| 588 | } |
| 589 | hfs_find_exit(&fd); |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 590 | mutex_unlock(&hip->extents_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 592 | hip->alloc_blocks = blk_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | out: |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 594 | hip->phys_size = inode->i_size; |
Anton Salikhmetov | 2753cc2 | 2010-12-16 18:08:38 +0200 | [diff] [blame] | 595 | hip->fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> |
| 596 | sb->s_blocksize_bits; |
Christoph Hellwig | 6af502d | 2010-10-01 05:43:31 +0200 | [diff] [blame] | 597 | inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); |
Christoph Hellwig | e349470 | 2010-11-23 14:38:15 +0100 | [diff] [blame] | 598 | hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |