Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/balloc.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * Enhanced block allocation by Stephen Tweedie (sct@redhat.com), 1993 | |
10 | * Big-endian to little-endian byte-swapping/bitmaps by | |
11 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
12 | */ | |
13 | ||
14 | #include <linux/time.h> | |
15 | #include <linux/capability.h> | |
16 | #include <linux/fs.h> | |
dab291af | 17 | #include <linux/jbd2.h> |
ac27a0ec DK |
18 | #include <linux/quotaops.h> |
19 | #include <linux/buffer_head.h> | |
3dcf5451 CH |
20 | #include "ext4.h" |
21 | #include "ext4_jbd2.h" | |
e21675d4 | 22 | #include "mballoc.h" |
3dcf5451 | 23 | |
ac27a0ec DK |
24 | /* |
25 | * balloc.c contains the blocks allocation and deallocation routines | |
26 | */ | |
27 | ||
72b64b59 AM |
28 | /* |
29 | * Calculate the block group number and offset, given a block number | |
30 | */ | |
31 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, | |
fd2d4291 | 32 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp) |
72b64b59 | 33 | { |
8c55e204 | 34 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
72b64b59 AM |
35 | ext4_grpblk_t offset; |
36 | ||
8c55e204 | 37 | blocknr = blocknr - le32_to_cpu(es->s_first_data_block); |
f4e5bc24 | 38 | offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)); |
72b64b59 AM |
39 | if (offsetp) |
40 | *offsetp = offset; | |
41 | if (blockgrpp) | |
8c55e204 | 42 | *blockgrpp = blocknr; |
72b64b59 AM |
43 | |
44 | } | |
45 | ||
0bf7e837 JS |
46 | static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block, |
47 | ext4_group_t block_group) | |
48 | { | |
49 | ext4_group_t actual_group; | |
7477827f | 50 | ext4_get_group_no_and_offset(sb, block, &actual_group, NULL); |
0bf7e837 JS |
51 | if (actual_group == block_group) |
52 | return 1; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static int ext4_group_used_meta_blocks(struct super_block *sb, | |
e187c658 TT |
57 | ext4_group_t block_group, |
58 | struct ext4_group_desc *gdp) | |
0bf7e837 JS |
59 | { |
60 | ext4_fsblk_t tmp; | |
61 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
62 | /* block bitmap, inode bitmap, and inode table blocks */ | |
63 | int used_blocks = sbi->s_itb_per_group + 2; | |
64 | ||
65 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { | |
0bf7e837 JS |
66 | if (!ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp), |
67 | block_group)) | |
68 | used_blocks--; | |
69 | ||
70 | if (!ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp), | |
71 | block_group)) | |
72 | used_blocks--; | |
73 | ||
74 | tmp = ext4_inode_table(sb, gdp); | |
75 | for (; tmp < ext4_inode_table(sb, gdp) + | |
76 | sbi->s_itb_per_group; tmp++) { | |
77 | if (!ext4_block_in_group(sb, tmp, block_group)) | |
78 | used_blocks -= 1; | |
79 | } | |
80 | } | |
81 | return used_blocks; | |
82 | } | |
c2ea3fde | 83 | |
717d50e4 AD |
84 | /* Initializes an uninitialized block bitmap if given, and returns the |
85 | * number of blocks free in the group. */ | |
86 | unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh, | |
fd2d4291 | 87 | ext4_group_t block_group, struct ext4_group_desc *gdp) |
717d50e4 | 88 | { |
717d50e4 | 89 | int bit, bit_max; |
8df9675f | 90 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
717d50e4 AD |
91 | unsigned free_blocks, group_blocks; |
92 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
93 | ||
94 | if (bh) { | |
95 | J_ASSERT_BH(bh, buffer_locked(bh)); | |
96 | ||
97 | /* If checksum is bad mark all blocks used to prevent allocation | |
98 | * essentially implementing a per-group read-only flag. */ | |
99 | if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { | |
46e665e9 | 100 | ext4_error(sb, __func__, |
a9df9a49 | 101 | "Checksum bad for group %u", block_group); |
560671a0 AK |
102 | ext4_free_blks_set(sb, gdp, 0); |
103 | ext4_free_inodes_set(sb, gdp, 0); | |
104 | ext4_itable_unused_set(sb, gdp, 0); | |
717d50e4 AD |
105 | memset(bh->b_data, 0xff, sb->s_blocksize); |
106 | return 0; | |
107 | } | |
108 | memset(bh->b_data, 0, sb->s_blocksize); | |
109 | } | |
110 | ||
111 | /* Check for superblock and gdt backups in this group */ | |
112 | bit_max = ext4_bg_has_super(sb, block_group); | |
113 | ||
114 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || | |
115 | block_group < le32_to_cpu(sbi->s_es->s_first_meta_bg) * | |
116 | sbi->s_desc_per_block) { | |
117 | if (bit_max) { | |
118 | bit_max += ext4_bg_num_gdb(sb, block_group); | |
119 | bit_max += | |
120 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks); | |
121 | } | |
122 | } else { /* For META_BG_BLOCK_GROUPS */ | |
6afd6707 | 123 | bit_max += ext4_bg_num_gdb(sb, block_group); |
717d50e4 AD |
124 | } |
125 | ||
8df9675f | 126 | if (block_group == ngroups - 1) { |
717d50e4 AD |
127 | /* |
128 | * Even though mke2fs always initialize first and last group | |
129 | * if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need | |
130 | * to make sure we calculate the right free blocks | |
131 | */ | |
132 | group_blocks = ext4_blocks_count(sbi->s_es) - | |
133 | le32_to_cpu(sbi->s_es->s_first_data_block) - | |
8df9675f | 134 | (EXT4_BLOCKS_PER_GROUP(sb) * (ngroups - 1)); |
717d50e4 AD |
135 | } else { |
136 | group_blocks = EXT4_BLOCKS_PER_GROUP(sb); | |
137 | } | |
138 | ||
139 | free_blocks = group_blocks - bit_max; | |
140 | ||
141 | if (bh) { | |
0bf7e837 JS |
142 | ext4_fsblk_t start, tmp; |
143 | int flex_bg = 0; | |
d00a6d7b | 144 | |
717d50e4 AD |
145 | for (bit = 0; bit < bit_max; bit++) |
146 | ext4_set_bit(bit, bh->b_data); | |
147 | ||
d00a6d7b | 148 | start = ext4_group_first_block_no(sb, block_group); |
717d50e4 | 149 | |
0bf7e837 JS |
150 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, |
151 | EXT4_FEATURE_INCOMPAT_FLEX_BG)) | |
152 | flex_bg = 1; | |
717d50e4 | 153 | |
0bf7e837 JS |
154 | /* Set bits for block and inode bitmaps, and inode table */ |
155 | tmp = ext4_block_bitmap(sb, gdp); | |
156 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) | |
157 | ext4_set_bit(tmp - start, bh->b_data); | |
158 | ||
159 | tmp = ext4_inode_bitmap(sb, gdp); | |
160 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) | |
161 | ext4_set_bit(tmp - start, bh->b_data); | |
162 | ||
163 | tmp = ext4_inode_table(sb, gdp); | |
164 | for (; tmp < ext4_inode_table(sb, gdp) + | |
165 | sbi->s_itb_per_group; tmp++) { | |
166 | if (!flex_bg || | |
167 | ext4_block_in_group(sb, tmp, block_group)) | |
168 | ext4_set_bit(tmp - start, bh->b_data); | |
169 | } | |
717d50e4 AD |
170 | /* |
171 | * Also if the number of blocks within the group is | |
172 | * less than the blocksize * 8 ( which is the size | |
173 | * of bitmap ), set rest of the block bitmap to 1 | |
174 | */ | |
175 | mark_bitmap_end(group_blocks, sb->s_blocksize * 8, bh->b_data); | |
176 | } | |
e187c658 | 177 | return free_blocks - ext4_group_used_meta_blocks(sb, block_group, gdp); |
717d50e4 AD |
178 | } |
179 | ||
180 | ||
ac27a0ec DK |
181 | /* |
182 | * The free blocks are managed by bitmaps. A file system contains several | |
183 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap | |
184 | * block for inodes, N blocks for the inode table and data blocks. | |
185 | * | |
186 | * The file system contains group descriptors which are located after the | |
187 | * super block. Each descriptor contains the number of the bitmap block and | |
188 | * the free blocks count in the block. The descriptors are loaded in memory | |
e627432c | 189 | * when a file system is mounted (see ext4_fill_super). |
ac27a0ec DK |
190 | */ |
191 | ||
192 | ||
193 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) | |
194 | ||
195 | /** | |
617ba13b | 196 | * ext4_get_group_desc() -- load group descriptor from disk |
ac27a0ec DK |
197 | * @sb: super block |
198 | * @block_group: given block group | |
199 | * @bh: pointer to the buffer head to store the block | |
200 | * group descriptor | |
201 | */ | |
af5bc92d | 202 | struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb, |
fd2d4291 | 203 | ext4_group_t block_group, |
af5bc92d | 204 | struct buffer_head **bh) |
ac27a0ec | 205 | { |
498e5f24 TT |
206 | unsigned int group_desc; |
207 | unsigned int offset; | |
8df9675f | 208 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
af5bc92d | 209 | struct ext4_group_desc *desc; |
617ba13b | 210 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec | 211 | |
8df9675f | 212 | if (block_group >= ngroups) { |
af5bc92d TT |
213 | ext4_error(sb, "ext4_get_group_desc", |
214 | "block_group >= groups_count - " | |
a9df9a49 | 215 | "block_group = %u, groups_count = %u", |
8df9675f | 216 | block_group, ngroups); |
ac27a0ec DK |
217 | |
218 | return NULL; | |
219 | } | |
ac27a0ec | 220 | |
617ba13b MC |
221 | group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb); |
222 | offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1); | |
ac27a0ec | 223 | if (!sbi->s_group_desc[group_desc]) { |
af5bc92d TT |
224 | ext4_error(sb, "ext4_get_group_desc", |
225 | "Group descriptor not loaded - " | |
498e5f24 | 226 | "block_group = %u, group_desc = %u, desc = %u", |
af5bc92d | 227 | block_group, group_desc, offset); |
ac27a0ec DK |
228 | return NULL; |
229 | } | |
230 | ||
0d1ee42f AR |
231 | desc = (struct ext4_group_desc *)( |
232 | (__u8 *)sbi->s_group_desc[group_desc]->b_data + | |
233 | offset * EXT4_DESC_SIZE(sb)); | |
ac27a0ec DK |
234 | if (bh) |
235 | *bh = sbi->s_group_desc[group_desc]; | |
0d1ee42f | 236 | return desc; |
ac27a0ec DK |
237 | } |
238 | ||
abcb2947 AK |
239 | static int ext4_valid_block_bitmap(struct super_block *sb, |
240 | struct ext4_group_desc *desc, | |
241 | unsigned int block_group, | |
242 | struct buffer_head *bh) | |
243 | { | |
244 | ext4_grpblk_t offset; | |
245 | ext4_grpblk_t next_zero_bit; | |
246 | ext4_fsblk_t bitmap_blk; | |
247 | ext4_fsblk_t group_first_block; | |
248 | ||
249 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { | |
250 | /* with FLEX_BG, the inode/block bitmaps and itable | |
251 | * blocks may not be in the group at all | |
252 | * so the bitmap validation will be skipped for those groups | |
253 | * or it has to also read the block group where the bitmaps | |
254 | * are located to verify they are set. | |
255 | */ | |
256 | return 1; | |
257 | } | |
258 | group_first_block = ext4_group_first_block_no(sb, block_group); | |
259 | ||
260 | /* check whether block bitmap block number is set */ | |
261 | bitmap_blk = ext4_block_bitmap(sb, desc); | |
262 | offset = bitmap_blk - group_first_block; | |
263 | if (!ext4_test_bit(offset, bh->b_data)) | |
264 | /* bad block bitmap */ | |
265 | goto err_out; | |
266 | ||
267 | /* check whether the inode bitmap block number is set */ | |
268 | bitmap_blk = ext4_inode_bitmap(sb, desc); | |
269 | offset = bitmap_blk - group_first_block; | |
270 | if (!ext4_test_bit(offset, bh->b_data)) | |
271 | /* bad block bitmap */ | |
272 | goto err_out; | |
273 | ||
274 | /* check whether the inode table block number is set */ | |
275 | bitmap_blk = ext4_inode_table(sb, desc); | |
276 | offset = bitmap_blk - group_first_block; | |
277 | next_zero_bit = ext4_find_next_zero_bit(bh->b_data, | |
278 | offset + EXT4_SB(sb)->s_itb_per_group, | |
279 | offset); | |
280 | if (next_zero_bit >= offset + EXT4_SB(sb)->s_itb_per_group) | |
281 | /* good bitmap for inode tables */ | |
282 | return 1; | |
283 | ||
284 | err_out: | |
46e665e9 | 285 | ext4_error(sb, __func__, |
abcb2947 AK |
286 | "Invalid block bitmap - " |
287 | "block_group = %d, block = %llu", | |
288 | block_group, bitmap_blk); | |
289 | return 0; | |
290 | } | |
ac27a0ec | 291 | /** |
574ca174 | 292 | * ext4_read_block_bitmap() |
ac27a0ec DK |
293 | * @sb: super block |
294 | * @block_group: given block group | |
295 | * | |
abcb2947 AK |
296 | * Read the bitmap for a given block_group,and validate the |
297 | * bits for block/inode/inode tables are set in the bitmaps | |
ac27a0ec DK |
298 | * |
299 | * Return buffer_head on success or NULL in case of failure. | |
300 | */ | |
717d50e4 | 301 | struct buffer_head * |
574ca174 | 302 | ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) |
ac27a0ec | 303 | { |
af5bc92d TT |
304 | struct ext4_group_desc *desc; |
305 | struct buffer_head *bh = NULL; | |
7c9e69fa | 306 | ext4_fsblk_t bitmap_blk; |
ac27a0ec | 307 | |
717d50e4 | 308 | desc = ext4_get_group_desc(sb, block_group, NULL); |
ac27a0ec | 309 | if (!desc) |
7c9e69fa AK |
310 | return NULL; |
311 | bitmap_blk = ext4_block_bitmap(sb, desc); | |
abcb2947 AK |
312 | bh = sb_getblk(sb, bitmap_blk); |
313 | if (unlikely(!bh)) { | |
46e665e9 | 314 | ext4_error(sb, __func__, |
abcb2947 | 315 | "Cannot read block bitmap - " |
a9df9a49 | 316 | "block_group = %u, block_bitmap = %llu", |
e29d1cde | 317 | block_group, bitmap_blk); |
abcb2947 AK |
318 | return NULL; |
319 | } | |
2ccb5fb9 AK |
320 | |
321 | if (bitmap_uptodate(bh)) | |
abcb2947 AK |
322 | return bh; |
323 | ||
c806e68f | 324 | lock_buffer(bh); |
2ccb5fb9 AK |
325 | if (bitmap_uptodate(bh)) { |
326 | unlock_buffer(bh); | |
327 | return bh; | |
328 | } | |
955ce5f5 | 329 | ext4_lock_group(sb, block_group); |
717d50e4 | 330 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
abcb2947 | 331 | ext4_init_block_bitmap(sb, bh, block_group, desc); |
2ccb5fb9 | 332 | set_bitmap_uptodate(bh); |
abcb2947 | 333 | set_buffer_uptodate(bh); |
955ce5f5 | 334 | ext4_unlock_group(sb, block_group); |
3300beda | 335 | unlock_buffer(bh); |
abcb2947 | 336 | return bh; |
717d50e4 | 337 | } |
955ce5f5 | 338 | ext4_unlock_group(sb, block_group); |
2ccb5fb9 AK |
339 | if (buffer_uptodate(bh)) { |
340 | /* | |
341 | * if not uninit if bh is uptodate, | |
342 | * bitmap is also uptodate | |
343 | */ | |
344 | set_bitmap_uptodate(bh); | |
345 | unlock_buffer(bh); | |
346 | return bh; | |
347 | } | |
348 | /* | |
349 | * submit the buffer_head for read. We can | |
350 | * safely mark the bitmap as uptodate now. | |
351 | * We do it here so the bitmap uptodate bit | |
352 | * get set with buffer lock held. | |
353 | */ | |
354 | set_bitmap_uptodate(bh); | |
abcb2947 AK |
355 | if (bh_submit_read(bh) < 0) { |
356 | put_bh(bh); | |
46e665e9 | 357 | ext4_error(sb, __func__, |
ac27a0ec | 358 | "Cannot read block bitmap - " |
a9df9a49 | 359 | "block_group = %u, block_bitmap = %llu", |
e29d1cde | 360 | block_group, bitmap_blk); |
abcb2947 AK |
361 | return NULL; |
362 | } | |
519deca0 AK |
363 | ext4_valid_block_bitmap(sb, desc, block_group, bh); |
364 | /* | |
365 | * file system mounted not to panic on error, | |
366 | * continue with corrupt bitmap | |
367 | */ | |
ac27a0ec DK |
368 | return bh; |
369 | } | |
ac27a0ec DK |
370 | |
371 | /** | |
e21675d4 | 372 | * ext4_add_groupblocks() -- Add given blocks to an existing group |
ac27a0ec DK |
373 | * @handle: handle to this transaction |
374 | * @sb: super block | |
e21675d4 | 375 | * @block: start physcial block to add to the block group |
ac27a0ec | 376 | * @count: number of blocks to free |
c2ea3fde | 377 | * |
e21675d4 AK |
378 | * This marks the blocks as free in the bitmap. We ask the |
379 | * mballoc to reload the buddy after this by setting group | |
380 | * EXT4_GROUP_INFO_NEED_INIT_BIT flag | |
ac27a0ec | 381 | */ |
e21675d4 AK |
382 | void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, |
383 | ext4_fsblk_t block, unsigned long count) | |
ac27a0ec DK |
384 | { |
385 | struct buffer_head *bitmap_bh = NULL; | |
386 | struct buffer_head *gd_bh; | |
fd2d4291 | 387 | ext4_group_t block_group; |
617ba13b | 388 | ext4_grpblk_t bit; |
498e5f24 | 389 | unsigned int i; |
af5bc92d TT |
390 | struct ext4_group_desc *desc; |
391 | struct ext4_super_block *es; | |
617ba13b | 392 | struct ext4_sb_info *sbi; |
560671a0 | 393 | int err = 0, ret, blk_free_count; |
e21675d4 AK |
394 | ext4_grpblk_t blocks_freed; |
395 | struct ext4_group_info *grp; | |
ac27a0ec | 396 | |
617ba13b | 397 | sbi = EXT4_SB(sb); |
ac27a0ec | 398 | es = sbi->s_es; |
e21675d4 | 399 | ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); |
ac27a0ec | 400 | |
3a5b2ecd | 401 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |
920313a7 | 402 | grp = ext4_get_group_info(sb, block_group); |
ac27a0ec DK |
403 | /* |
404 | * Check to see if we are freeing blocks across a group | |
405 | * boundary. | |
406 | */ | |
617ba13b | 407 | if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
e21675d4 | 408 | goto error_return; |
ac27a0ec | 409 | } |
574ca174 | 410 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
ac27a0ec DK |
411 | if (!bitmap_bh) |
412 | goto error_return; | |
af5bc92d | 413 | desc = ext4_get_group_desc(sb, block_group, &gd_bh); |
ac27a0ec DK |
414 | if (!desc) |
415 | goto error_return; | |
416 | ||
8fadc143 AR |
417 | if (in_range(ext4_block_bitmap(sb, desc), block, count) || |
418 | in_range(ext4_inode_bitmap(sb, desc), block, count) || | |
419 | in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || | |
420 | in_range(block + count - 1, ext4_inode_table(sb, desc), | |
cb47dce7 | 421 | sbi->s_itb_per_group)) { |
e21675d4 AK |
422 | ext4_error(sb, __func__, |
423 | "Adding blocks in system zones - " | |
af5bc92d TT |
424 | "Block = %llu, count = %lu", |
425 | block, count); | |
cb47dce7 AK |
426 | goto error_return; |
427 | } | |
ac27a0ec DK |
428 | |
429 | /* | |
e21675d4 | 430 | * We are about to add blocks to the bitmap, |
ac27a0ec DK |
431 | * so we need undo access. |
432 | */ | |
ac27a0ec | 433 | BUFFER_TRACE(bitmap_bh, "getting undo access"); |
617ba13b | 434 | err = ext4_journal_get_undo_access(handle, bitmap_bh); |
ac27a0ec DK |
435 | if (err) |
436 | goto error_return; | |
437 | ||
438 | /* | |
439 | * We are about to modify some metadata. Call the journal APIs | |
440 | * to unshare ->b_data if a currently-committing transaction is | |
441 | * using it | |
442 | */ | |
443 | BUFFER_TRACE(gd_bh, "get_write_access"); | |
617ba13b | 444 | err = ext4_journal_get_write_access(handle, gd_bh); |
ac27a0ec DK |
445 | if (err) |
446 | goto error_return; | |
920313a7 AK |
447 | /* |
448 | * make sure we don't allow a parallel init on other groups in the | |
449 | * same buddy cache | |
450 | */ | |
451 | down_write(&grp->alloc_sem); | |
e21675d4 | 452 | for (i = 0, blocks_freed = 0; i < count; i++) { |
ac27a0ec | 453 | BUFFER_TRACE(bitmap_bh, "clear bit"); |
955ce5f5 | 454 | if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group), |
ac27a0ec | 455 | bit + i, bitmap_bh->b_data)) { |
46e665e9 | 456 | ext4_error(sb, __func__, |
2ae02107 | 457 | "bit already cleared for block %llu", |
bd81d8ee | 458 | (ext4_fsblk_t)(block + i)); |
ac27a0ec DK |
459 | BUFFER_TRACE(bitmap_bh, "bit already cleared"); |
460 | } else { | |
e21675d4 | 461 | blocks_freed++; |
ac27a0ec DK |
462 | } |
463 | } | |
955ce5f5 | 464 | ext4_lock_group(sb, block_group); |
560671a0 AK |
465 | blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc); |
466 | ext4_free_blks_set(sb, desc, blk_free_count); | |
717d50e4 | 467 | desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc); |
955ce5f5 | 468 | ext4_unlock_group(sb, block_group); |
e21675d4 | 469 | percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed); |
ac27a0ec | 470 | |
772cb7c8 JS |
471 | if (sbi->s_log_groups_per_flex) { |
472 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); | |
9f24e420 TT |
473 | atomic_add(blocks_freed, |
474 | &sbi->s_flex_groups[flex_group].free_blocks); | |
772cb7c8 | 475 | } |
920313a7 AK |
476 | /* |
477 | * request to reload the buddy with the | |
478 | * new bitmap information | |
479 | */ | |
480 | set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); | |
481 | ext4_mb_update_group_info(grp, blocks_freed); | |
482 | up_write(&grp->alloc_sem); | |
772cb7c8 | 483 | |
ac27a0ec DK |
484 | /* We dirtied the bitmap block */ |
485 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); | |
0390131b | 486 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
ac27a0ec DK |
487 | |
488 | /* And the group descriptor block */ | |
489 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); | |
0390131b | 490 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |
e21675d4 AK |
491 | if (!err) |
492 | err = ret; | |
ac27a0ec | 493 | sb->s_dirt = 1; |
e21675d4 | 494 | |
ac27a0ec DK |
495 | error_return: |
496 | brelse(bitmap_bh); | |
617ba13b | 497 | ext4_std_error(sb, err); |
ac27a0ec DK |
498 | return; |
499 | } | |
500 | ||
501 | /** | |
617ba13b | 502 | * ext4_free_blocks() -- Free given blocks and update quota |
ac27a0ec DK |
503 | * @handle: handle for this transaction |
504 | * @inode: inode | |
505 | * @block: start physical block to free | |
506 | * @count: number of blocks to count | |
c9de560d | 507 | * @metadata: Are these metadata blocks |
ac27a0ec | 508 | */ |
617ba13b | 509 | void ext4_free_blocks(handle_t *handle, struct inode *inode, |
c9de560d AT |
510 | ext4_fsblk_t block, unsigned long count, |
511 | int metadata) | |
ac27a0ec | 512 | { |
af5bc92d | 513 | struct super_block *sb; |
ac27a0ec DK |
514 | unsigned long dquot_freed_blocks; |
515 | ||
c9de560d AT |
516 | /* this isn't the right place to decide whether block is metadata |
517 | * inode.c/extents.c knows better, but for safety ... */ | |
a1aebc1e AK |
518 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
519 | metadata = 1; | |
520 | ||
521 | /* We need to make sure we don't reuse | |
522 | * block released untill the transaction commit. | |
523 | * writeback mode have weak data consistency so | |
524 | * don't force data as metadata when freeing block | |
525 | * for writeback mode. | |
526 | */ | |
527 | if (metadata == 0 && !ext4_should_writeback_data(inode)) | |
c9de560d AT |
528 | metadata = 1; |
529 | ||
ac27a0ec | 530 | sb = inode->i_sb; |
c9de560d | 531 | |
c2ea3fde TT |
532 | ext4_mb_free_blocks(handle, inode, block, count, |
533 | metadata, &dquot_freed_blocks); | |
ac27a0ec | 534 | if (dquot_freed_blocks) |
a269eb18 | 535 | vfs_dq_free_block(inode, dquot_freed_blocks); |
ac27a0ec DK |
536 | return; |
537 | } | |
538 | ||
8c3bf8a0 ES |
539 | /** |
540 | * ext4_has_free_blocks() | |
541 | * @sbi: in-core super block structure. | |
542 | * @nblocks: number of needed blocks | |
543 | * | |
544 | * Check if filesystem has nblocks free & available for allocation. | |
545 | * On success return 1, return 0 on failure. | |
546 | */ | |
547 | int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks) | |
a30d542a | 548 | { |
a996031c | 549 | s64 free_blocks, dirty_blocks, root_blocks; |
a30d542a | 550 | struct percpu_counter *fbc = &sbi->s_freeblocks_counter; |
6bc6e63f | 551 | struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter; |
a30d542a | 552 | |
6bc6e63f AK |
553 | free_blocks = percpu_counter_read_positive(fbc); |
554 | dirty_blocks = percpu_counter_read_positive(dbc); | |
a996031c | 555 | root_blocks = ext4_r_blocks_count(sbi->s_es); |
a30d542a | 556 | |
6bc6e63f AK |
557 | if (free_blocks - (nblocks + root_blocks + dirty_blocks) < |
558 | EXT4_FREEBLOCKS_WATERMARK) { | |
02d21168 AM |
559 | free_blocks = percpu_counter_sum_positive(fbc); |
560 | dirty_blocks = percpu_counter_sum_positive(dbc); | |
6bc6e63f AK |
561 | if (dirty_blocks < 0) { |
562 | printk(KERN_CRIT "Dirty block accounting " | |
563 | "went wrong %lld\n", | |
8f72fbdf | 564 | (long long)dirty_blocks); |
6bc6e63f AK |
565 | } |
566 | } | |
567 | /* Check whether we have space after | |
a996031c | 568 | * accounting for current dirty blocks & root reserved blocks. |
6bc6e63f | 569 | */ |
a996031c ES |
570 | if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks)) |
571 | return 1; | |
a30d542a | 572 | |
a996031c | 573 | /* Hm, nope. Are (enough) root reserved blocks available? */ |
4c9c544e | 574 | if (sbi->s_resuid == current_fsuid() || |
a996031c ES |
575 | ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) || |
576 | capable(CAP_SYS_RESOURCE)) { | |
577 | if (free_blocks >= (nblocks + dirty_blocks)) | |
578 | return 1; | |
579 | } | |
580 | ||
581 | return 0; | |
a30d542a AK |
582 | } |
583 | ||
8c3bf8a0 | 584 | int ext4_claim_free_blocks(struct ext4_sb_info *sbi, |
5c791616 | 585 | s64 nblocks) |
ac27a0ec | 586 | { |
8c3bf8a0 ES |
587 | if (ext4_has_free_blocks(sbi, nblocks)) { |
588 | percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks); | |
16eb7295 | 589 | return 0; |
8c3bf8a0 ES |
590 | } else |
591 | return -ENOSPC; | |
a30d542a | 592 | } |
07031431 | 593 | |
ac27a0ec | 594 | /** |
617ba13b | 595 | * ext4_should_retry_alloc() |
ac27a0ec DK |
596 | * @sb: super block |
597 | * @retries number of attemps has been made | |
598 | * | |
617ba13b | 599 | * ext4_should_retry_alloc() is called when ENOSPC is returned, and if |
ac27a0ec DK |
600 | * it is profitable to retry the operation, this function will wait |
601 | * for the current or commiting transaction to complete, and then | |
602 | * return TRUE. | |
603 | * | |
604 | * if the total number of retries exceed three times, return FALSE. | |
605 | */ | |
617ba13b | 606 | int ext4_should_retry_alloc(struct super_block *sb, int *retries) |
ac27a0ec | 607 | { |
8f64b32e ES |
608 | if (!ext4_has_free_blocks(EXT4_SB(sb), 1) || |
609 | (*retries)++ > 3 || | |
610 | !EXT4_SB(sb)->s_journal) | |
ac27a0ec DK |
611 | return 0; |
612 | ||
613 | jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id); | |
614 | ||
dab291af | 615 | return jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
616 | } |
617 | ||
654b4908 | 618 | /* |
d2a17637 | 619 | * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks |
654b4908 AK |
620 | * |
621 | * @handle: handle to this transaction | |
622 | * @inode: file inode | |
623 | * @goal: given target block(filesystem wide) | |
97df5d15 | 624 | * @count: pointer to total number of blocks needed |
654b4908 AK |
625 | * @errp: error code |
626 | * | |
97df5d15 | 627 | * Return 1st allocated block number on success, *count stores total account |
d2a17637 | 628 | * error stores in errp pointer |
654b4908 | 629 | */ |
d2a17637 MC |
630 | ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
631 | ext4_fsblk_t goal, unsigned long *count, int *errp) | |
654b4908 | 632 | { |
97df5d15 | 633 | struct ext4_allocation_request ar; |
d2a17637 | 634 | ext4_fsblk_t ret; |
97df5d15 TT |
635 | |
636 | memset(&ar, 0, sizeof(ar)); | |
637 | /* Fill with neighbour allocated blocks */ | |
638 | ar.inode = inode; | |
639 | ar.goal = goal; | |
640 | ar.len = count ? *count : 1; | |
641 | ||
642 | ret = ext4_mb_new_blocks(handle, &ar, errp); | |
643 | if (count) | |
644 | *count = ar.len; | |
645 | ||
d2a17637 MC |
646 | /* |
647 | * Account for the allocated meta blocks | |
648 | */ | |
166348dd | 649 | if (!(*errp) && EXT4_I(inode)->i_delalloc_reserved_flag) { |
d2a17637 | 650 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
97df5d15 | 651 | EXT4_I(inode)->i_allocated_meta_blocks += ar.len; |
d2a17637 MC |
652 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
653 | } | |
654 | return ret; | |
654b4908 AK |
655 | } |
656 | ||
ac27a0ec | 657 | /** |
617ba13b | 658 | * ext4_count_free_blocks() -- count filesystem free blocks |
ac27a0ec DK |
659 | * @sb: superblock |
660 | * | |
661 | * Adds up the number of free blocks from each block group. | |
662 | */ | |
617ba13b | 663 | ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb) |
ac27a0ec | 664 | { |
617ba13b MC |
665 | ext4_fsblk_t desc_count; |
666 | struct ext4_group_desc *gdp; | |
fd2d4291 | 667 | ext4_group_t i; |
8df9675f | 668 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
617ba13b MC |
669 | #ifdef EXT4FS_DEBUG |
670 | struct ext4_super_block *es; | |
671 | ext4_fsblk_t bitmap_count; | |
498e5f24 | 672 | unsigned int x; |
ac27a0ec DK |
673 | struct buffer_head *bitmap_bh = NULL; |
674 | ||
617ba13b | 675 | es = EXT4_SB(sb)->s_es; |
ac27a0ec DK |
676 | desc_count = 0; |
677 | bitmap_count = 0; | |
678 | gdp = NULL; | |
679 | ||
ac27a0ec | 680 | for (i = 0; i < ngroups; i++) { |
617ba13b | 681 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
682 | if (!gdp) |
683 | continue; | |
9fd9784c | 684 | desc_count += ext4_free_blks_count(sb, gdp); |
ac27a0ec | 685 | brelse(bitmap_bh); |
574ca174 | 686 | bitmap_bh = ext4_read_block_bitmap(sb, i); |
ac27a0ec DK |
687 | if (bitmap_bh == NULL) |
688 | continue; | |
689 | ||
617ba13b | 690 | x = ext4_count_free(bitmap_bh, sb->s_blocksize); |
9fd9784c TLSC |
691 | printk(KERN_DEBUG "group %u: stored = %d, counted = %u\n", |
692 | i, ext4_free_blks_count(sb, gdp), x); | |
ac27a0ec DK |
693 | bitmap_count += x; |
694 | } | |
695 | brelse(bitmap_bh); | |
4776004f TT |
696 | printk(KERN_DEBUG "ext4_count_free_blocks: stored = %llu" |
697 | ", computed = %llu, %llu\n", ext4_free_blocks_count(es), | |
698 | desc_count, bitmap_count); | |
ac27a0ec DK |
699 | return bitmap_count; |
700 | #else | |
701 | desc_count = 0; | |
ac27a0ec | 702 | for (i = 0; i < ngroups; i++) { |
617ba13b | 703 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
704 | if (!gdp) |
705 | continue; | |
560671a0 | 706 | desc_count += ext4_free_blks_count(sb, gdp); |
ac27a0ec DK |
707 | } |
708 | ||
709 | return desc_count; | |
710 | #endif | |
711 | } | |
712 | ||
fd2d4291 | 713 | static inline int test_root(ext4_group_t a, int b) |
ac27a0ec DK |
714 | { |
715 | int num = b; | |
716 | ||
717 | while (a > num) | |
718 | num *= b; | |
719 | return num == a; | |
720 | } | |
721 | ||
fd2d4291 | 722 | static int ext4_group_sparse(ext4_group_t group) |
ac27a0ec DK |
723 | { |
724 | if (group <= 1) | |
725 | return 1; | |
726 | if (!(group & 1)) | |
727 | return 0; | |
728 | return (test_root(group, 7) || test_root(group, 5) || | |
729 | test_root(group, 3)); | |
730 | } | |
731 | ||
732 | /** | |
617ba13b | 733 | * ext4_bg_has_super - number of blocks used by the superblock in group |
ac27a0ec DK |
734 | * @sb: superblock for filesystem |
735 | * @group: group number to check | |
736 | * | |
737 | * Return the number of blocks used by the superblock (primary or backup) | |
738 | * in this group. Currently this will be only 0 or 1. | |
739 | */ | |
fd2d4291 | 740 | int ext4_bg_has_super(struct super_block *sb, ext4_group_t group) |
ac27a0ec | 741 | { |
617ba13b MC |
742 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
743 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) && | |
744 | !ext4_group_sparse(group)) | |
ac27a0ec DK |
745 | return 0; |
746 | return 1; | |
747 | } | |
748 | ||
fd2d4291 AM |
749 | static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb, |
750 | ext4_group_t group) | |
ac27a0ec | 751 | { |
617ba13b | 752 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); |
fd2d4291 AM |
753 | ext4_group_t first = metagroup * EXT4_DESC_PER_BLOCK(sb); |
754 | ext4_group_t last = first + EXT4_DESC_PER_BLOCK(sb) - 1; | |
ac27a0ec DK |
755 | |
756 | if (group == first || group == first + 1 || group == last) | |
757 | return 1; | |
758 | return 0; | |
759 | } | |
760 | ||
fd2d4291 AM |
761 | static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb, |
762 | ext4_group_t group) | |
ac27a0ec | 763 | { |
859cb936 | 764 | return ext4_bg_has_super(sb, group) ? EXT4_SB(sb)->s_gdb_count : 0; |
ac27a0ec DK |
765 | } |
766 | ||
767 | /** | |
617ba13b | 768 | * ext4_bg_num_gdb - number of blocks used by the group table in group |
ac27a0ec DK |
769 | * @sb: superblock for filesystem |
770 | * @group: group number to check | |
771 | * | |
772 | * Return the number of blocks used by the group descriptor table | |
773 | * (primary or backup) in this group. In the future there may be a | |
774 | * different number of descriptor blocks in each group. | |
775 | */ | |
fd2d4291 | 776 | unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group) |
ac27a0ec DK |
777 | { |
778 | unsigned long first_meta_bg = | |
617ba13b MC |
779 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg); |
780 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 781 | |
617ba13b | 782 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 783 | metagroup < first_meta_bg) |
af5bc92d | 784 | return ext4_bg_num_gdb_nometa(sb, group); |
ac27a0ec | 785 | |
617ba13b | 786 | return ext4_bg_num_gdb_meta(sb,group); |
ac27a0ec DK |
787 | |
788 | } | |
c2ea3fde | 789 |