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Commit | Line | Data |
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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" | |
717d50e4 | 22 | #include "group.h" |
e21675d4 | 23 | #include "mballoc.h" |
3dcf5451 | 24 | |
ac27a0ec DK |
25 | /* |
26 | * balloc.c contains the blocks allocation and deallocation routines | |
27 | */ | |
28 | ||
72b64b59 AM |
29 | /* |
30 | * Calculate the block group number and offset, given a block number | |
31 | */ | |
32 | void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, | |
fd2d4291 | 33 | ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp) |
72b64b59 | 34 | { |
8c55e204 | 35 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
72b64b59 AM |
36 | ext4_grpblk_t offset; |
37 | ||
8c55e204 | 38 | blocknr = blocknr - le32_to_cpu(es->s_first_data_block); |
f4e5bc24 | 39 | offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)); |
72b64b59 AM |
40 | if (offsetp) |
41 | *offsetp = offset; | |
42 | if (blockgrpp) | |
8c55e204 | 43 | *blockgrpp = blocknr; |
72b64b59 AM |
44 | |
45 | } | |
46 | ||
0bf7e837 JS |
47 | static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block, |
48 | ext4_group_t block_group) | |
49 | { | |
50 | ext4_group_t actual_group; | |
7477827f | 51 | ext4_get_group_no_and_offset(sb, block, &actual_group, NULL); |
0bf7e837 JS |
52 | if (actual_group == block_group) |
53 | return 1; | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static int ext4_group_used_meta_blocks(struct super_block *sb, | |
e187c658 TT |
58 | ext4_group_t block_group, |
59 | struct ext4_group_desc *gdp) | |
0bf7e837 JS |
60 | { |
61 | ext4_fsblk_t tmp; | |
62 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
63 | /* block bitmap, inode bitmap, and inode table blocks */ | |
64 | int used_blocks = sbi->s_itb_per_group + 2; | |
65 | ||
66 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { | |
0bf7e837 JS |
67 | if (!ext4_block_in_group(sb, ext4_block_bitmap(sb, gdp), |
68 | block_group)) | |
69 | used_blocks--; | |
70 | ||
71 | if (!ext4_block_in_group(sb, ext4_inode_bitmap(sb, gdp), | |
72 | block_group)) | |
73 | used_blocks--; | |
74 | ||
75 | tmp = ext4_inode_table(sb, gdp); | |
76 | for (; tmp < ext4_inode_table(sb, gdp) + | |
77 | sbi->s_itb_per_group; tmp++) { | |
78 | if (!ext4_block_in_group(sb, tmp, block_group)) | |
79 | used_blocks -= 1; | |
80 | } | |
81 | } | |
82 | return used_blocks; | |
83 | } | |
c2ea3fde | 84 | |
717d50e4 AD |
85 | /* Initializes an uninitialized block bitmap if given, and returns the |
86 | * number of blocks free in the group. */ | |
87 | unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh, | |
fd2d4291 | 88 | ext4_group_t block_group, struct ext4_group_desc *gdp) |
717d50e4 | 89 | { |
717d50e4 | 90 | int bit, bit_max; |
8df9675f | 91 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
717d50e4 AD |
92 | unsigned free_blocks, group_blocks; |
93 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
94 | ||
95 | if (bh) { | |
96 | J_ASSERT_BH(bh, buffer_locked(bh)); | |
97 | ||
98 | /* If checksum is bad mark all blocks used to prevent allocation | |
99 | * essentially implementing a per-group read-only flag. */ | |
100 | if (!ext4_group_desc_csum_verify(sbi, block_group, gdp)) { | |
46e665e9 | 101 | ext4_error(sb, __func__, |
a9df9a49 | 102 | "Checksum bad for group %u", block_group); |
560671a0 AK |
103 | ext4_free_blks_set(sb, gdp, 0); |
104 | ext4_free_inodes_set(sb, gdp, 0); | |
105 | ext4_itable_unused_set(sb, gdp, 0); | |
717d50e4 AD |
106 | memset(bh->b_data, 0xff, sb->s_blocksize); |
107 | return 0; | |
108 | } | |
109 | memset(bh->b_data, 0, sb->s_blocksize); | |
110 | } | |
111 | ||
112 | /* Check for superblock and gdt backups in this group */ | |
113 | bit_max = ext4_bg_has_super(sb, block_group); | |
114 | ||
115 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || | |
116 | block_group < le32_to_cpu(sbi->s_es->s_first_meta_bg) * | |
117 | sbi->s_desc_per_block) { | |
118 | if (bit_max) { | |
119 | bit_max += ext4_bg_num_gdb(sb, block_group); | |
120 | bit_max += | |
121 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks); | |
122 | } | |
123 | } else { /* For META_BG_BLOCK_GROUPS */ | |
6afd6707 | 124 | bit_max += ext4_bg_num_gdb(sb, block_group); |
717d50e4 AD |
125 | } |
126 | ||
8df9675f | 127 | if (block_group == ngroups - 1) { |
717d50e4 AD |
128 | /* |
129 | * Even though mke2fs always initialize first and last group | |
130 | * if some other tool enabled the EXT4_BG_BLOCK_UNINIT we need | |
131 | * to make sure we calculate the right free blocks | |
132 | */ | |
133 | group_blocks = ext4_blocks_count(sbi->s_es) - | |
134 | le32_to_cpu(sbi->s_es->s_first_data_block) - | |
8df9675f | 135 | (EXT4_BLOCKS_PER_GROUP(sb) * (ngroups - 1)); |
717d50e4 AD |
136 | } else { |
137 | group_blocks = EXT4_BLOCKS_PER_GROUP(sb); | |
138 | } | |
139 | ||
140 | free_blocks = group_blocks - bit_max; | |
141 | ||
142 | if (bh) { | |
0bf7e837 JS |
143 | ext4_fsblk_t start, tmp; |
144 | int flex_bg = 0; | |
d00a6d7b | 145 | |
717d50e4 AD |
146 | for (bit = 0; bit < bit_max; bit++) |
147 | ext4_set_bit(bit, bh->b_data); | |
148 | ||
d00a6d7b | 149 | start = ext4_group_first_block_no(sb, block_group); |
717d50e4 | 150 | |
0bf7e837 JS |
151 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, |
152 | EXT4_FEATURE_INCOMPAT_FLEX_BG)) | |
153 | flex_bg = 1; | |
717d50e4 | 154 | |
0bf7e837 JS |
155 | /* Set bits for block and inode bitmaps, and inode table */ |
156 | tmp = ext4_block_bitmap(sb, gdp); | |
157 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) | |
158 | ext4_set_bit(tmp - start, bh->b_data); | |
159 | ||
160 | tmp = ext4_inode_bitmap(sb, gdp); | |
161 | if (!flex_bg || ext4_block_in_group(sb, tmp, block_group)) | |
162 | ext4_set_bit(tmp - start, bh->b_data); | |
163 | ||
164 | tmp = ext4_inode_table(sb, gdp); | |
165 | for (; tmp < ext4_inode_table(sb, gdp) + | |
166 | sbi->s_itb_per_group; tmp++) { | |
167 | if (!flex_bg || | |
168 | ext4_block_in_group(sb, tmp, block_group)) | |
169 | ext4_set_bit(tmp - start, bh->b_data); | |
170 | } | |
717d50e4 AD |
171 | /* |
172 | * Also if the number of blocks within the group is | |
173 | * less than the blocksize * 8 ( which is the size | |
174 | * of bitmap ), set rest of the block bitmap to 1 | |
175 | */ | |
176 | mark_bitmap_end(group_blocks, sb->s_blocksize * 8, bh->b_data); | |
177 | } | |
e187c658 | 178 | return free_blocks - ext4_group_used_meta_blocks(sb, block_group, gdp); |
717d50e4 AD |
179 | } |
180 | ||
181 | ||
ac27a0ec DK |
182 | /* |
183 | * The free blocks are managed by bitmaps. A file system contains several | |
184 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap | |
185 | * block for inodes, N blocks for the inode table and data blocks. | |
186 | * | |
187 | * The file system contains group descriptors which are located after the | |
188 | * super block. Each descriptor contains the number of the bitmap block and | |
189 | * the free blocks count in the block. The descriptors are loaded in memory | |
e627432c | 190 | * when a file system is mounted (see ext4_fill_super). |
ac27a0ec DK |
191 | */ |
192 | ||
193 | ||
194 | #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) | |
195 | ||
196 | /** | |
617ba13b | 197 | * ext4_get_group_desc() -- load group descriptor from disk |
ac27a0ec DK |
198 | * @sb: super block |
199 | * @block_group: given block group | |
200 | * @bh: pointer to the buffer head to store the block | |
201 | * group descriptor | |
202 | */ | |
af5bc92d | 203 | struct ext4_group_desc * ext4_get_group_desc(struct super_block *sb, |
fd2d4291 | 204 | ext4_group_t block_group, |
af5bc92d | 205 | struct buffer_head **bh) |
ac27a0ec | 206 | { |
498e5f24 TT |
207 | unsigned int group_desc; |
208 | unsigned int offset; | |
8df9675f | 209 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
af5bc92d | 210 | struct ext4_group_desc *desc; |
617ba13b | 211 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec | 212 | |
8df9675f | 213 | if (block_group >= ngroups) { |
af5bc92d TT |
214 | ext4_error(sb, "ext4_get_group_desc", |
215 | "block_group >= groups_count - " | |
a9df9a49 | 216 | "block_group = %u, groups_count = %u", |
8df9675f | 217 | block_group, ngroups); |
ac27a0ec DK |
218 | |
219 | return NULL; | |
220 | } | |
ac27a0ec | 221 | |
617ba13b MC |
222 | group_desc = block_group >> EXT4_DESC_PER_BLOCK_BITS(sb); |
223 | offset = block_group & (EXT4_DESC_PER_BLOCK(sb) - 1); | |
ac27a0ec | 224 | if (!sbi->s_group_desc[group_desc]) { |
af5bc92d TT |
225 | ext4_error(sb, "ext4_get_group_desc", |
226 | "Group descriptor not loaded - " | |
498e5f24 | 227 | "block_group = %u, group_desc = %u, desc = %u", |
af5bc92d | 228 | block_group, group_desc, offset); |
ac27a0ec DK |
229 | return NULL; |
230 | } | |
231 | ||
0d1ee42f AR |
232 | desc = (struct ext4_group_desc *)( |
233 | (__u8 *)sbi->s_group_desc[group_desc]->b_data + | |
234 | offset * EXT4_DESC_SIZE(sb)); | |
ac27a0ec DK |
235 | if (bh) |
236 | *bh = sbi->s_group_desc[group_desc]; | |
0d1ee42f | 237 | return desc; |
ac27a0ec DK |
238 | } |
239 | ||
abcb2947 AK |
240 | static int ext4_valid_block_bitmap(struct super_block *sb, |
241 | struct ext4_group_desc *desc, | |
242 | unsigned int block_group, | |
243 | struct buffer_head *bh) | |
244 | { | |
245 | ext4_grpblk_t offset; | |
246 | ext4_grpblk_t next_zero_bit; | |
247 | ext4_fsblk_t bitmap_blk; | |
248 | ext4_fsblk_t group_first_block; | |
249 | ||
250 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { | |
251 | /* with FLEX_BG, the inode/block bitmaps and itable | |
252 | * blocks may not be in the group at all | |
253 | * so the bitmap validation will be skipped for those groups | |
254 | * or it has to also read the block group where the bitmaps | |
255 | * are located to verify they are set. | |
256 | */ | |
257 | return 1; | |
258 | } | |
259 | group_first_block = ext4_group_first_block_no(sb, block_group); | |
260 | ||
261 | /* check whether block bitmap block number is set */ | |
262 | bitmap_blk = ext4_block_bitmap(sb, desc); | |
263 | offset = bitmap_blk - group_first_block; | |
264 | if (!ext4_test_bit(offset, bh->b_data)) | |
265 | /* bad block bitmap */ | |
266 | goto err_out; | |
267 | ||
268 | /* check whether the inode bitmap block number is set */ | |
269 | bitmap_blk = ext4_inode_bitmap(sb, desc); | |
270 | offset = bitmap_blk - group_first_block; | |
271 | if (!ext4_test_bit(offset, bh->b_data)) | |
272 | /* bad block bitmap */ | |
273 | goto err_out; | |
274 | ||
275 | /* check whether the inode table block number is set */ | |
276 | bitmap_blk = ext4_inode_table(sb, desc); | |
277 | offset = bitmap_blk - group_first_block; | |
278 | next_zero_bit = ext4_find_next_zero_bit(bh->b_data, | |
279 | offset + EXT4_SB(sb)->s_itb_per_group, | |
280 | offset); | |
281 | if (next_zero_bit >= offset + EXT4_SB(sb)->s_itb_per_group) | |
282 | /* good bitmap for inode tables */ | |
283 | return 1; | |
284 | ||
285 | err_out: | |
46e665e9 | 286 | ext4_error(sb, __func__, |
abcb2947 AK |
287 | "Invalid block bitmap - " |
288 | "block_group = %d, block = %llu", | |
289 | block_group, bitmap_blk); | |
290 | return 0; | |
291 | } | |
ac27a0ec | 292 | /** |
574ca174 | 293 | * ext4_read_block_bitmap() |
ac27a0ec DK |
294 | * @sb: super block |
295 | * @block_group: given block group | |
296 | * | |
abcb2947 AK |
297 | * Read the bitmap for a given block_group,and validate the |
298 | * bits for block/inode/inode tables are set in the bitmaps | |
ac27a0ec DK |
299 | * |
300 | * Return buffer_head on success or NULL in case of failure. | |
301 | */ | |
717d50e4 | 302 | struct buffer_head * |
574ca174 | 303 | ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) |
ac27a0ec | 304 | { |
af5bc92d TT |
305 | struct ext4_group_desc *desc; |
306 | struct buffer_head *bh = NULL; | |
7c9e69fa | 307 | ext4_fsblk_t bitmap_blk; |
ac27a0ec | 308 | |
717d50e4 | 309 | desc = ext4_get_group_desc(sb, block_group, NULL); |
ac27a0ec | 310 | if (!desc) |
7c9e69fa AK |
311 | return NULL; |
312 | bitmap_blk = ext4_block_bitmap(sb, desc); | |
abcb2947 AK |
313 | bh = sb_getblk(sb, bitmap_blk); |
314 | if (unlikely(!bh)) { | |
46e665e9 | 315 | ext4_error(sb, __func__, |
abcb2947 | 316 | "Cannot read block bitmap - " |
a9df9a49 | 317 | "block_group = %u, block_bitmap = %llu", |
e29d1cde | 318 | block_group, bitmap_blk); |
abcb2947 AK |
319 | return NULL; |
320 | } | |
2ccb5fb9 AK |
321 | |
322 | if (bitmap_uptodate(bh)) | |
abcb2947 AK |
323 | return bh; |
324 | ||
c806e68f | 325 | lock_buffer(bh); |
2ccb5fb9 AK |
326 | if (bitmap_uptodate(bh)) { |
327 | unlock_buffer(bh); | |
328 | return bh; | |
329 | } | |
b5f10eed | 330 | spin_lock(sb_bgl_lock(EXT4_SB(sb), block_group)); |
717d50e4 | 331 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
abcb2947 | 332 | ext4_init_block_bitmap(sb, bh, block_group, desc); |
2ccb5fb9 | 333 | set_bitmap_uptodate(bh); |
abcb2947 | 334 | set_buffer_uptodate(bh); |
b5f10eed | 335 | spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group)); |
3300beda | 336 | unlock_buffer(bh); |
abcb2947 | 337 | return bh; |
717d50e4 | 338 | } |
b5f10eed | 339 | spin_unlock(sb_bgl_lock(EXT4_SB(sb), block_group)); |
2ccb5fb9 AK |
340 | if (buffer_uptodate(bh)) { |
341 | /* | |
342 | * if not uninit if bh is uptodate, | |
343 | * bitmap is also uptodate | |
344 | */ | |
345 | set_bitmap_uptodate(bh); | |
346 | unlock_buffer(bh); | |
347 | return bh; | |
348 | } | |
349 | /* | |
350 | * submit the buffer_head for read. We can | |
351 | * safely mark the bitmap as uptodate now. | |
352 | * We do it here so the bitmap uptodate bit | |
353 | * get set with buffer lock held. | |
354 | */ | |
355 | set_bitmap_uptodate(bh); | |
abcb2947 AK |
356 | if (bh_submit_read(bh) < 0) { |
357 | put_bh(bh); | |
46e665e9 | 358 | ext4_error(sb, __func__, |
ac27a0ec | 359 | "Cannot read block bitmap - " |
a9df9a49 | 360 | "block_group = %u, block_bitmap = %llu", |
e29d1cde | 361 | block_group, bitmap_blk); |
abcb2947 AK |
362 | return NULL; |
363 | } | |
519deca0 AK |
364 | ext4_valid_block_bitmap(sb, desc, block_group, bh); |
365 | /* | |
366 | * file system mounted not to panic on error, | |
367 | * continue with corrupt bitmap | |
368 | */ | |
ac27a0ec DK |
369 | return bh; |
370 | } | |
ac27a0ec DK |
371 | |
372 | /** | |
e21675d4 | 373 | * ext4_add_groupblocks() -- Add given blocks to an existing group |
ac27a0ec DK |
374 | * @handle: handle to this transaction |
375 | * @sb: super block | |
e21675d4 | 376 | * @block: start physcial block to add to the block group |
ac27a0ec | 377 | * @count: number of blocks to free |
c2ea3fde | 378 | * |
e21675d4 AK |
379 | * This marks the blocks as free in the bitmap. We ask the |
380 | * mballoc to reload the buddy after this by setting group | |
381 | * EXT4_GROUP_INFO_NEED_INIT_BIT flag | |
ac27a0ec | 382 | */ |
e21675d4 AK |
383 | void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, |
384 | ext4_fsblk_t block, unsigned long count) | |
ac27a0ec DK |
385 | { |
386 | struct buffer_head *bitmap_bh = NULL; | |
387 | struct buffer_head *gd_bh; | |
fd2d4291 | 388 | ext4_group_t block_group; |
617ba13b | 389 | ext4_grpblk_t bit; |
498e5f24 | 390 | unsigned int i; |
af5bc92d TT |
391 | struct ext4_group_desc *desc; |
392 | struct ext4_super_block *es; | |
617ba13b | 393 | struct ext4_sb_info *sbi; |
560671a0 | 394 | int err = 0, ret, blk_free_count; |
e21675d4 AK |
395 | ext4_grpblk_t blocks_freed; |
396 | struct ext4_group_info *grp; | |
ac27a0ec | 397 | |
617ba13b | 398 | sbi = EXT4_SB(sb); |
ac27a0ec | 399 | es = sbi->s_es; |
e21675d4 | 400 | ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); |
ac27a0ec | 401 | |
3a5b2ecd | 402 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |
920313a7 | 403 | grp = ext4_get_group_info(sb, block_group); |
ac27a0ec DK |
404 | /* |
405 | * Check to see if we are freeing blocks across a group | |
406 | * boundary. | |
407 | */ | |
617ba13b | 408 | if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
e21675d4 | 409 | goto error_return; |
ac27a0ec | 410 | } |
574ca174 | 411 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
ac27a0ec DK |
412 | if (!bitmap_bh) |
413 | goto error_return; | |
af5bc92d | 414 | desc = ext4_get_group_desc(sb, block_group, &gd_bh); |
ac27a0ec DK |
415 | if (!desc) |
416 | goto error_return; | |
417 | ||
8fadc143 AR |
418 | if (in_range(ext4_block_bitmap(sb, desc), block, count) || |
419 | in_range(ext4_inode_bitmap(sb, desc), block, count) || | |
420 | in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || | |
421 | in_range(block + count - 1, ext4_inode_table(sb, desc), | |
cb47dce7 | 422 | sbi->s_itb_per_group)) { |
e21675d4 AK |
423 | ext4_error(sb, __func__, |
424 | "Adding blocks in system zones - " | |
af5bc92d TT |
425 | "Block = %llu, count = %lu", |
426 | block, count); | |
cb47dce7 AK |
427 | goto error_return; |
428 | } | |
ac27a0ec DK |
429 | |
430 | /* | |
e21675d4 | 431 | * We are about to add blocks to the bitmap, |
ac27a0ec DK |
432 | * so we need undo access. |
433 | */ | |
ac27a0ec | 434 | BUFFER_TRACE(bitmap_bh, "getting undo access"); |
617ba13b | 435 | err = ext4_journal_get_undo_access(handle, bitmap_bh); |
ac27a0ec DK |
436 | if (err) |
437 | goto error_return; | |
438 | ||
439 | /* | |
440 | * We are about to modify some metadata. Call the journal APIs | |
441 | * to unshare ->b_data if a currently-committing transaction is | |
442 | * using it | |
443 | */ | |
444 | BUFFER_TRACE(gd_bh, "get_write_access"); | |
617ba13b | 445 | err = ext4_journal_get_write_access(handle, gd_bh); |
ac27a0ec DK |
446 | if (err) |
447 | goto error_return; | |
920313a7 AK |
448 | /* |
449 | * make sure we don't allow a parallel init on other groups in the | |
450 | * same buddy cache | |
451 | */ | |
452 | down_write(&grp->alloc_sem); | |
e21675d4 | 453 | for (i = 0, blocks_freed = 0; i < count; i++) { |
ac27a0ec | 454 | BUFFER_TRACE(bitmap_bh, "clear bit"); |
617ba13b | 455 | if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), |
ac27a0ec | 456 | bit + i, bitmap_bh->b_data)) { |
46e665e9 | 457 | ext4_error(sb, __func__, |
2ae02107 | 458 | "bit already cleared for block %llu", |
bd81d8ee | 459 | (ext4_fsblk_t)(block + i)); |
ac27a0ec DK |
460 | BUFFER_TRACE(bitmap_bh, "bit already cleared"); |
461 | } else { | |
e21675d4 | 462 | blocks_freed++; |
ac27a0ec DK |
463 | } |
464 | } | |
ac27a0ec | 465 | spin_lock(sb_bgl_lock(sbi, block_group)); |
560671a0 AK |
466 | blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc); |
467 | ext4_free_blks_set(sb, desc, blk_free_count); | |
717d50e4 | 468 | desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc); |
ac27a0ec | 469 | spin_unlock(sb_bgl_lock(sbi, block_group)); |
e21675d4 | 470 | percpu_counter_add(&sbi->s_freeblocks_counter, blocks_freed); |
ac27a0ec | 471 | |
772cb7c8 JS |
472 | if (sbi->s_log_groups_per_flex) { |
473 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); | |
9f24e420 TT |
474 | atomic_add(blocks_freed, |
475 | &sbi->s_flex_groups[flex_group].free_blocks); | |
772cb7c8 | 476 | } |
920313a7 AK |
477 | /* |
478 | * request to reload the buddy with the | |
479 | * new bitmap information | |
480 | */ | |
481 | set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); | |
482 | ext4_mb_update_group_info(grp, blocks_freed); | |
483 | up_write(&grp->alloc_sem); | |
772cb7c8 | 484 | |
ac27a0ec DK |
485 | /* We dirtied the bitmap block */ |
486 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); | |
0390131b | 487 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
ac27a0ec DK |
488 | |
489 | /* And the group descriptor block */ | |
490 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); | |
0390131b | 491 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |
e21675d4 AK |
492 | if (!err) |
493 | err = ret; | |
ac27a0ec | 494 | sb->s_dirt = 1; |
e21675d4 | 495 | |
ac27a0ec DK |
496 | error_return: |
497 | brelse(bitmap_bh); | |
617ba13b | 498 | ext4_std_error(sb, err); |
ac27a0ec DK |
499 | return; |
500 | } | |
501 | ||
502 | /** | |
617ba13b | 503 | * ext4_free_blocks() -- Free given blocks and update quota |
ac27a0ec DK |
504 | * @handle: handle for this transaction |
505 | * @inode: inode | |
506 | * @block: start physical block to free | |
507 | * @count: number of blocks to count | |
c9de560d | 508 | * @metadata: Are these metadata blocks |
ac27a0ec | 509 | */ |
617ba13b | 510 | void ext4_free_blocks(handle_t *handle, struct inode *inode, |
c9de560d AT |
511 | ext4_fsblk_t block, unsigned long count, |
512 | int metadata) | |
ac27a0ec | 513 | { |
af5bc92d | 514 | struct super_block *sb; |
ac27a0ec DK |
515 | unsigned long dquot_freed_blocks; |
516 | ||
c9de560d AT |
517 | /* this isn't the right place to decide whether block is metadata |
518 | * inode.c/extents.c knows better, but for safety ... */ | |
a1aebc1e AK |
519 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
520 | metadata = 1; | |
521 | ||
522 | /* We need to make sure we don't reuse | |
523 | * block released untill the transaction commit. | |
524 | * writeback mode have weak data consistency so | |
525 | * don't force data as metadata when freeing block | |
526 | * for writeback mode. | |
527 | */ | |
528 | if (metadata == 0 && !ext4_should_writeback_data(inode)) | |
c9de560d AT |
529 | metadata = 1; |
530 | ||
ac27a0ec | 531 | sb = inode->i_sb; |
c9de560d | 532 | |
c2ea3fde TT |
533 | ext4_mb_free_blocks(handle, inode, block, count, |
534 | metadata, &dquot_freed_blocks); | |
ac27a0ec | 535 | if (dquot_freed_blocks) |
a269eb18 | 536 | vfs_dq_free_block(inode, dquot_freed_blocks); |
ac27a0ec DK |
537 | return; |
538 | } | |
539 | ||
8c3bf8a0 ES |
540 | /** |
541 | * ext4_has_free_blocks() | |
542 | * @sbi: in-core super block structure. | |
543 | * @nblocks: number of needed blocks | |
544 | * | |
545 | * Check if filesystem has nblocks free & available for allocation. | |
546 | * On success return 1, return 0 on failure. | |
547 | */ | |
548 | int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks) | |
a30d542a | 549 | { |
a996031c | 550 | s64 free_blocks, dirty_blocks, root_blocks; |
a30d542a | 551 | struct percpu_counter *fbc = &sbi->s_freeblocks_counter; |
6bc6e63f | 552 | struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter; |
a30d542a | 553 | |
6bc6e63f AK |
554 | free_blocks = percpu_counter_read_positive(fbc); |
555 | dirty_blocks = percpu_counter_read_positive(dbc); | |
a996031c | 556 | root_blocks = ext4_r_blocks_count(sbi->s_es); |
a30d542a | 557 | |
6bc6e63f AK |
558 | if (free_blocks - (nblocks + root_blocks + dirty_blocks) < |
559 | EXT4_FREEBLOCKS_WATERMARK) { | |
02d21168 AM |
560 | free_blocks = percpu_counter_sum_positive(fbc); |
561 | dirty_blocks = percpu_counter_sum_positive(dbc); | |
6bc6e63f AK |
562 | if (dirty_blocks < 0) { |
563 | printk(KERN_CRIT "Dirty block accounting " | |
564 | "went wrong %lld\n", | |
8f72fbdf | 565 | (long long)dirty_blocks); |
6bc6e63f AK |
566 | } |
567 | } | |
568 | /* Check whether we have space after | |
a996031c | 569 | * accounting for current dirty blocks & root reserved blocks. |
6bc6e63f | 570 | */ |
a996031c ES |
571 | if (free_blocks >= ((root_blocks + nblocks) + dirty_blocks)) |
572 | return 1; | |
a30d542a | 573 | |
a996031c | 574 | /* Hm, nope. Are (enough) root reserved blocks available? */ |
4c9c544e | 575 | if (sbi->s_resuid == current_fsuid() || |
a996031c ES |
576 | ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) || |
577 | capable(CAP_SYS_RESOURCE)) { | |
578 | if (free_blocks >= (nblocks + dirty_blocks)) | |
579 | return 1; | |
580 | } | |
581 | ||
582 | return 0; | |
a30d542a AK |
583 | } |
584 | ||
8c3bf8a0 | 585 | int ext4_claim_free_blocks(struct ext4_sb_info *sbi, |
5c791616 | 586 | s64 nblocks) |
ac27a0ec | 587 | { |
8c3bf8a0 ES |
588 | if (ext4_has_free_blocks(sbi, nblocks)) { |
589 | percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks); | |
16eb7295 | 590 | return 0; |
8c3bf8a0 ES |
591 | } else |
592 | return -ENOSPC; | |
a30d542a | 593 | } |
07031431 | 594 | |
ac27a0ec | 595 | /** |
617ba13b | 596 | * ext4_should_retry_alloc() |
ac27a0ec DK |
597 | * @sb: super block |
598 | * @retries number of attemps has been made | |
599 | * | |
617ba13b | 600 | * ext4_should_retry_alloc() is called when ENOSPC is returned, and if |
ac27a0ec DK |
601 | * it is profitable to retry the operation, this function will wait |
602 | * for the current or commiting transaction to complete, and then | |
603 | * return TRUE. | |
604 | * | |
605 | * if the total number of retries exceed three times, return FALSE. | |
606 | */ | |
617ba13b | 607 | int ext4_should_retry_alloc(struct super_block *sb, int *retries) |
ac27a0ec | 608 | { |
8f64b32e ES |
609 | if (!ext4_has_free_blocks(EXT4_SB(sb), 1) || |
610 | (*retries)++ > 3 || | |
611 | !EXT4_SB(sb)->s_journal) | |
ac27a0ec DK |
612 | return 0; |
613 | ||
614 | jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id); | |
615 | ||
dab291af | 616 | return jbd2_journal_force_commit_nested(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
617 | } |
618 | ||
654b4908 | 619 | /* |
d2a17637 | 620 | * ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks |
654b4908 AK |
621 | * |
622 | * @handle: handle to this transaction | |
623 | * @inode: file inode | |
624 | * @goal: given target block(filesystem wide) | |
97df5d15 | 625 | * @count: pointer to total number of blocks needed |
654b4908 AK |
626 | * @errp: error code |
627 | * | |
97df5d15 | 628 | * Return 1st allocated block number on success, *count stores total account |
d2a17637 | 629 | * error stores in errp pointer |
654b4908 | 630 | */ |
d2a17637 MC |
631 | ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, |
632 | ext4_fsblk_t goal, unsigned long *count, int *errp) | |
654b4908 | 633 | { |
97df5d15 | 634 | struct ext4_allocation_request ar; |
d2a17637 | 635 | ext4_fsblk_t ret; |
97df5d15 TT |
636 | |
637 | memset(&ar, 0, sizeof(ar)); | |
638 | /* Fill with neighbour allocated blocks */ | |
639 | ar.inode = inode; | |
640 | ar.goal = goal; | |
641 | ar.len = count ? *count : 1; | |
642 | ||
643 | ret = ext4_mb_new_blocks(handle, &ar, errp); | |
644 | if (count) | |
645 | *count = ar.len; | |
646 | ||
d2a17637 MC |
647 | /* |
648 | * Account for the allocated meta blocks | |
649 | */ | |
166348dd | 650 | if (!(*errp) && EXT4_I(inode)->i_delalloc_reserved_flag) { |
d2a17637 | 651 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
97df5d15 | 652 | EXT4_I(inode)->i_allocated_meta_blocks += ar.len; |
d2a17637 MC |
653 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
654 | } | |
655 | return ret; | |
654b4908 AK |
656 | } |
657 | ||
ac27a0ec | 658 | /** |
617ba13b | 659 | * ext4_count_free_blocks() -- count filesystem free blocks |
ac27a0ec DK |
660 | * @sb: superblock |
661 | * | |
662 | * Adds up the number of free blocks from each block group. | |
663 | */ | |
617ba13b | 664 | ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb) |
ac27a0ec | 665 | { |
617ba13b MC |
666 | ext4_fsblk_t desc_count; |
667 | struct ext4_group_desc *gdp; | |
fd2d4291 | 668 | ext4_group_t i; |
8df9675f | 669 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
617ba13b MC |
670 | #ifdef EXT4FS_DEBUG |
671 | struct ext4_super_block *es; | |
672 | ext4_fsblk_t bitmap_count; | |
498e5f24 | 673 | unsigned int x; |
ac27a0ec DK |
674 | struct buffer_head *bitmap_bh = NULL; |
675 | ||
617ba13b | 676 | es = EXT4_SB(sb)->s_es; |
ac27a0ec DK |
677 | desc_count = 0; |
678 | bitmap_count = 0; | |
679 | gdp = NULL; | |
680 | ||
ac27a0ec | 681 | for (i = 0; i < ngroups; i++) { |
617ba13b | 682 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
683 | if (!gdp) |
684 | continue; | |
9fd9784c | 685 | desc_count += ext4_free_blks_count(sb, gdp); |
ac27a0ec | 686 | brelse(bitmap_bh); |
574ca174 | 687 | bitmap_bh = ext4_read_block_bitmap(sb, i); |
ac27a0ec DK |
688 | if (bitmap_bh == NULL) |
689 | continue; | |
690 | ||
617ba13b | 691 | x = ext4_count_free(bitmap_bh, sb->s_blocksize); |
9fd9784c TLSC |
692 | printk(KERN_DEBUG "group %u: stored = %d, counted = %u\n", |
693 | i, ext4_free_blks_count(sb, gdp), x); | |
ac27a0ec DK |
694 | bitmap_count += x; |
695 | } | |
696 | brelse(bitmap_bh); | |
4776004f TT |
697 | printk(KERN_DEBUG "ext4_count_free_blocks: stored = %llu" |
698 | ", computed = %llu, %llu\n", ext4_free_blocks_count(es), | |
699 | desc_count, bitmap_count); | |
ac27a0ec DK |
700 | return bitmap_count; |
701 | #else | |
702 | desc_count = 0; | |
ac27a0ec | 703 | for (i = 0; i < ngroups; i++) { |
617ba13b | 704 | gdp = ext4_get_group_desc(sb, i, NULL); |
ac27a0ec DK |
705 | if (!gdp) |
706 | continue; | |
560671a0 | 707 | desc_count += ext4_free_blks_count(sb, gdp); |
ac27a0ec DK |
708 | } |
709 | ||
710 | return desc_count; | |
711 | #endif | |
712 | } | |
713 | ||
fd2d4291 | 714 | static inline int test_root(ext4_group_t a, int b) |
ac27a0ec DK |
715 | { |
716 | int num = b; | |
717 | ||
718 | while (a > num) | |
719 | num *= b; | |
720 | return num == a; | |
721 | } | |
722 | ||
fd2d4291 | 723 | static int ext4_group_sparse(ext4_group_t group) |
ac27a0ec DK |
724 | { |
725 | if (group <= 1) | |
726 | return 1; | |
727 | if (!(group & 1)) | |
728 | return 0; | |
729 | return (test_root(group, 7) || test_root(group, 5) || | |
730 | test_root(group, 3)); | |
731 | } | |
732 | ||
733 | /** | |
617ba13b | 734 | * ext4_bg_has_super - number of blocks used by the superblock in group |
ac27a0ec DK |
735 | * @sb: superblock for filesystem |
736 | * @group: group number to check | |
737 | * | |
738 | * Return the number of blocks used by the superblock (primary or backup) | |
739 | * in this group. Currently this will be only 0 or 1. | |
740 | */ | |
fd2d4291 | 741 | int ext4_bg_has_super(struct super_block *sb, ext4_group_t group) |
ac27a0ec | 742 | { |
617ba13b MC |
743 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
744 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER) && | |
745 | !ext4_group_sparse(group)) | |
ac27a0ec DK |
746 | return 0; |
747 | return 1; | |
748 | } | |
749 | ||
fd2d4291 AM |
750 | static unsigned long ext4_bg_num_gdb_meta(struct super_block *sb, |
751 | ext4_group_t group) | |
ac27a0ec | 752 | { |
617ba13b | 753 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); |
fd2d4291 AM |
754 | ext4_group_t first = metagroup * EXT4_DESC_PER_BLOCK(sb); |
755 | ext4_group_t last = first + EXT4_DESC_PER_BLOCK(sb) - 1; | |
ac27a0ec DK |
756 | |
757 | if (group == first || group == first + 1 || group == last) | |
758 | return 1; | |
759 | return 0; | |
760 | } | |
761 | ||
fd2d4291 AM |
762 | static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb, |
763 | ext4_group_t group) | |
ac27a0ec | 764 | { |
859cb936 | 765 | return ext4_bg_has_super(sb, group) ? EXT4_SB(sb)->s_gdb_count : 0; |
ac27a0ec DK |
766 | } |
767 | ||
768 | /** | |
617ba13b | 769 | * ext4_bg_num_gdb - number of blocks used by the group table in group |
ac27a0ec DK |
770 | * @sb: superblock for filesystem |
771 | * @group: group number to check | |
772 | * | |
773 | * Return the number of blocks used by the group descriptor table | |
774 | * (primary or backup) in this group. In the future there may be a | |
775 | * different number of descriptor blocks in each group. | |
776 | */ | |
fd2d4291 | 777 | unsigned long ext4_bg_num_gdb(struct super_block *sb, ext4_group_t group) |
ac27a0ec DK |
778 | { |
779 | unsigned long first_meta_bg = | |
617ba13b MC |
780 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg); |
781 | unsigned long metagroup = group / EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 782 | |
617ba13b | 783 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb,EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 784 | metagroup < first_meta_bg) |
af5bc92d | 785 | return ext4_bg_num_gdb_nometa(sb, group); |
ac27a0ec | 786 | |
617ba13b | 787 | return ext4_bg_num_gdb_meta(sb,group); |
ac27a0ec DK |
788 | |
789 | } | |
c2ea3fde | 790 |