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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/resize.c |
ac27a0ec | 4 | * |
617ba13b | 5 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
6 | * |
7 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
8 | * | |
9 | * This could probably be made into a module, because it is not often in use. | |
10 | */ | |
11 | ||
12 | ||
617ba13b | 13 | #define EXT4FS_DEBUG |
ac27a0ec | 14 | |
ac27a0ec DK |
15 | #include <linux/errno.h> |
16 | #include <linux/slab.h> | |
17 | ||
3dcf5451 | 18 | #include "ext4_jbd2.h" |
ac27a0ec | 19 | |
8f82f840 YY |
20 | int ext4_resize_begin(struct super_block *sb) |
21 | { | |
22 | int ret = 0; | |
23 | ||
24 | if (!capable(CAP_SYS_RESOURCE)) | |
25 | return -EPERM; | |
26 | ||
011fa994 TT |
27 | /* |
28 | * If we are not using the primary superblock/GDT copy don't resize, | |
29 | * because the user tools have no way of handling this. Probably a | |
30 | * bad time to do it anyways. | |
31 | */ | |
32 | if (EXT4_SB(sb)->s_sbh->b_blocknr != | |
33 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
34 | ext4_warning(sb, "won't resize using backup superblock at %llu", | |
35 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); | |
36 | return -EPERM; | |
37 | } | |
38 | ||
ce723c31 YY |
39 | /* |
40 | * We are not allowed to do online-resizing on a filesystem mounted | |
41 | * with error, because it can destroy the filesystem easily. | |
42 | */ | |
43 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
44 | ext4_warning(sb, "There are errors in the filesystem, " | |
8d2ae1cb | 45 | "so online resizing is not allowed"); |
ce723c31 YY |
46 | return -EPERM; |
47 | } | |
48 | ||
9549a168 TT |
49 | if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, |
50 | &EXT4_SB(sb)->s_ext4_flags)) | |
8f82f840 YY |
51 | ret = -EBUSY; |
52 | ||
53 | return ret; | |
54 | } | |
55 | ||
56 | void ext4_resize_end(struct super_block *sb) | |
57 | { | |
9549a168 | 58 | clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); |
4e857c58 | 59 | smp_mb__after_atomic(); |
8f82f840 YY |
60 | } |
61 | ||
01f795f9 YY |
62 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
63 | ext4_group_t group) { | |
64 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
65 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
66 | } | |
67 | ||
68 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
69 | ext4_group_t group) { | |
70 | group = ext4_meta_bg_first_group(sb, group); | |
71 | return ext4_group_first_block_no(sb, group); | |
72 | } | |
73 | ||
74 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
75 | ext4_group_t group) { | |
76 | ext4_grpblk_t overhead; | |
77 | overhead = ext4_bg_num_gdb(sb, group); | |
78 | if (ext4_bg_has_super(sb, group)) | |
79 | overhead += 1 + | |
80 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
81 | return overhead; | |
82 | } | |
83 | ||
ac27a0ec DK |
84 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
85 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
86 | ||
87 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 88 | struct ext4_new_group_data *input) |
ac27a0ec | 89 | { |
617ba13b MC |
90 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
91 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 92 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 93 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 94 | ext4_group_t group = input->group; |
617ba13b | 95 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
b302ef2d TT |
96 | unsigned overhead; |
97 | ext4_fsblk_t metaend; | |
ac27a0ec | 98 | struct buffer_head *bh = NULL; |
3a5b2ecd | 99 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
100 | int err = -EINVAL; |
101 | ||
b302ef2d TT |
102 | if (group != sbi->s_groups_count) { |
103 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", | |
104 | input->group, sbi->s_groups_count); | |
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | overhead = ext4_group_overhead_blocks(sb, group); | |
109 | metaend = start + overhead; | |
d77147ff | 110 | input->free_clusters_count = free_blocks_count = |
ac27a0ec DK |
111 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
112 | ||
113 | if (test_opt(sb, DEBUG)) | |
617ba13b | 114 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 115 | "(%d free, %u reserved)\n", |
617ba13b | 116 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
117 | "no-super", input->group, input->blocks_count, |
118 | free_blocks_count, input->reserved_blocks); | |
119 | ||
3a5b2ecd | 120 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
b302ef2d | 121 | if (offset != 0) |
12062ddd | 122 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 123 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 124 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
125 | input->reserved_blocks); |
126 | else if (free_blocks_count < 0) | |
12062ddd | 127 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
128 | input->blocks_count); |
129 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 130 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
131 | end - 1); |
132 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 133 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 134 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 135 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 136 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 137 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 138 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 139 | outside(itend - 1, start, end)) |
12062ddd | 140 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 141 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 142 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 143 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 144 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 145 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
146 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
147 | "(%llu-%llu)", | |
1939e49a RD |
148 | (unsigned long long)input->block_bitmap, |
149 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 150 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
151 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
152 | "(%llu-%llu)", | |
1939e49a RD |
153 | (unsigned long long)input->inode_bitmap, |
154 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 155 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 156 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
157 | (unsigned long long)input->block_bitmap, |
158 | start, metaend - 1); | |
ac27a0ec | 159 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 160 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
161 | (unsigned long long)input->inode_bitmap, |
162 | start, metaend - 1); | |
ac27a0ec | 163 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 164 | inside(itend - 1, start, metaend)) |
12062ddd ES |
165 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
166 | "(%llu-%llu)", | |
1939e49a RD |
167 | (unsigned long long)input->inode_table, |
168 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
169 | else |
170 | err = 0; | |
171 | brelse(bh); | |
172 | ||
173 | return err; | |
174 | } | |
175 | ||
28c7bac0 YY |
176 | /* |
177 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
178 | * group each time. | |
179 | */ | |
180 | struct ext4_new_flex_group_data { | |
181 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
182 | in the flex group */ | |
183 | __u16 *bg_flags; /* block group flags of groups | |
184 | in @groups */ | |
185 | ext4_group_t count; /* number of groups in @groups | |
186 | */ | |
187 | }; | |
188 | ||
189 | /* | |
190 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
191 | * @flexbg_size. | |
192 | * | |
193 | * Returns NULL on failure otherwise address of the allocated structure. | |
194 | */ | |
195 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
196 | { | |
197 | struct ext4_new_flex_group_data *flex_gd; | |
198 | ||
199 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
200 | if (flex_gd == NULL) | |
201 | goto out3; | |
202 | ||
46901760 | 203 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) |
967ac8af | 204 | goto out2; |
28c7bac0 YY |
205 | flex_gd->count = flexbg_size; |
206 | ||
6da2ec56 KC |
207 | flex_gd->groups = kmalloc_array(flexbg_size, |
208 | sizeof(struct ext4_new_group_data), | |
209 | GFP_NOFS); | |
28c7bac0 YY |
210 | if (flex_gd->groups == NULL) |
211 | goto out2; | |
212 | ||
6da2ec56 KC |
213 | flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), |
214 | GFP_NOFS); | |
28c7bac0 YY |
215 | if (flex_gd->bg_flags == NULL) |
216 | goto out1; | |
217 | ||
218 | return flex_gd; | |
219 | ||
220 | out1: | |
221 | kfree(flex_gd->groups); | |
222 | out2: | |
223 | kfree(flex_gd); | |
224 | out3: | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
229 | { | |
230 | kfree(flex_gd->bg_flags); | |
231 | kfree(flex_gd->groups); | |
232 | kfree(flex_gd); | |
233 | } | |
234 | ||
3fbea4b3 YY |
235 | /* |
236 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
237 | * and inode tables for a flex group. | |
238 | * | |
239 | * This function is used by 64bit-resize. Note that this function allocates | |
240 | * group tables from the 1st group of groups contained by @flexgd, which may | |
241 | * be a partial of a flex group. | |
242 | * | |
243 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
244 | * |
245 | * Returns 0 on a successful allocation of the metadata blocks in the | |
246 | * block group. | |
3fbea4b3 | 247 | */ |
03c1c290 | 248 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
249 | struct ext4_new_flex_group_data *flex_gd, |
250 | int flexbg_size) | |
251 | { | |
252 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
253 | ext4_fsblk_t start_blk; |
254 | ext4_fsblk_t last_blk; | |
255 | ext4_group_t src_group; | |
256 | ext4_group_t bb_index = 0; | |
257 | ext4_group_t ib_index = 0; | |
258 | ext4_group_t it_index = 0; | |
259 | ext4_group_t group; | |
260 | ext4_group_t last_group; | |
261 | unsigned overhead; | |
b93c9535 | 262 | __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; |
d77147ff | 263 | int i; |
3fbea4b3 YY |
264 | |
265 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
266 | ||
267 | src_group = group_data[0].group; | |
268 | last_group = src_group + flex_gd->count - 1; | |
269 | ||
270 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
271 | (last_group & ~(flexbg_size - 1)))); | |
272 | next_group: | |
273 | group = group_data[0].group; | |
03c1c290 YY |
274 | if (src_group >= group_data[0].group + flex_gd->count) |
275 | return -ENOSPC; | |
3fbea4b3 YY |
276 | start_blk = ext4_group_first_block_no(sb, src_group); |
277 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
278 | ||
01f795f9 | 279 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
280 | |
281 | start_blk += overhead; | |
282 | ||
3fbea4b3 YY |
283 | /* We collect contiguous blocks as much as possible. */ |
284 | src_group++; | |
01f795f9 YY |
285 | for (; src_group <= last_group; src_group++) { |
286 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
b93c9535 | 287 | if (overhead == 0) |
3fbea4b3 YY |
288 | last_blk += group_data[src_group - group].blocks_count; |
289 | else | |
290 | break; | |
01f795f9 | 291 | } |
3fbea4b3 YY |
292 | |
293 | /* Allocate block bitmaps */ | |
294 | for (; bb_index < flex_gd->count; bb_index++) { | |
295 | if (start_blk >= last_blk) | |
296 | goto next_group; | |
297 | group_data[bb_index].block_bitmap = start_blk++; | |
bd86298e | 298 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 299 | group -= group_data[0].group; |
d77147ff | 300 | group_data[group].mdata_blocks++; |
b93c9535 | 301 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
302 | } |
303 | ||
304 | /* Allocate inode bitmaps */ | |
305 | for (; ib_index < flex_gd->count; ib_index++) { | |
306 | if (start_blk >= last_blk) | |
307 | goto next_group; | |
308 | group_data[ib_index].inode_bitmap = start_blk++; | |
bd86298e | 309 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 310 | group -= group_data[0].group; |
d77147ff | 311 | group_data[group].mdata_blocks++; |
b93c9535 | 312 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
313 | } |
314 | ||
315 | /* Allocate inode tables */ | |
316 | for (; it_index < flex_gd->count; it_index++) { | |
b93c9535 TT |
317 | unsigned int itb = EXT4_SB(sb)->s_itb_per_group; |
318 | ext4_fsblk_t next_group_start; | |
319 | ||
320 | if (start_blk + itb > last_blk) | |
3fbea4b3 YY |
321 | goto next_group; |
322 | group_data[it_index].inode_table = start_blk; | |
b93c9535 TT |
323 | group = ext4_get_group_number(sb, start_blk); |
324 | next_group_start = ext4_group_first_block_no(sb, group + 1); | |
3fbea4b3 | 325 | group -= group_data[0].group; |
3fbea4b3 | 326 | |
b93c9535 TT |
327 | if (start_blk + itb > next_group_start) { |
328 | flex_gd->bg_flags[group + 1] &= uninit_mask; | |
329 | overhead = start_blk + itb - next_group_start; | |
d77147ff | 330 | group_data[group + 1].mdata_blocks += overhead; |
b93c9535 TT |
331 | itb -= overhead; |
332 | } | |
333 | ||
d77147ff | 334 | group_data[group].mdata_blocks += itb; |
b93c9535 | 335 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
336 | start_blk += EXT4_SB(sb)->s_itb_per_group; |
337 | } | |
338 | ||
d77147ff | 339 | /* Update free clusters count to exclude metadata blocks */ |
340 | for (i = 0; i < flex_gd->count; i++) { | |
341 | group_data[i].free_clusters_count -= | |
342 | EXT4_NUM_B2C(EXT4_SB(sb), | |
343 | group_data[i].mdata_blocks); | |
344 | } | |
345 | ||
3fbea4b3 YY |
346 | if (test_opt(sb, DEBUG)) { |
347 | int i; | |
348 | group = group_data[0].group; | |
349 | ||
350 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
351 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
352 | flexbg_size); | |
353 | ||
354 | for (i = 0; i < flex_gd->count; i++) { | |
d77147ff | 355 | ext4_debug( |
356 | "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", | |
3fbea4b3 YY |
357 | ext4_bg_has_super(sb, group + i) ? "normal" : |
358 | "no-super", group + i, | |
359 | group_data[i].blocks_count, | |
d77147ff | 360 | group_data[i].free_clusters_count, |
361 | group_data[i].mdata_blocks); | |
3fbea4b3 YY |
362 | } |
363 | } | |
03c1c290 | 364 | return 0; |
3fbea4b3 YY |
365 | } |
366 | ||
ac27a0ec | 367 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 368 | ext4_fsblk_t blk) |
ac27a0ec DK |
369 | { |
370 | struct buffer_head *bh; | |
371 | int err; | |
372 | ||
373 | bh = sb_getblk(sb, blk); | |
aebf0243 | 374 | if (unlikely(!bh)) |
860d21e2 | 375 | return ERR_PTR(-ENOMEM); |
5d601255 | 376 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 377 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
378 | brelse(bh); |
379 | bh = ERR_PTR(err); | |
380 | } else { | |
ac27a0ec DK |
381 | memset(bh->b_data, 0, sb->s_blocksize); |
382 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
383 | } |
384 | ||
385 | return bh; | |
386 | } | |
387 | ||
14904107 ES |
388 | /* |
389 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
390 | * If that fails, restart the transaction & regain write access for the | |
391 | * buffer head which is used for block_bitmap modifications. | |
392 | */ | |
6d40bc5a | 393 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
394 | { |
395 | int err; | |
396 | ||
0390131b | 397 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
398 | return 0; |
399 | ||
400 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
401 | if (err < 0) | |
402 | return err; | |
403 | if (err) { | |
6d40bc5a YY |
404 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
405 | if (err) | |
14904107 | 406 | return err; |
2b2d6d01 | 407 | } |
14904107 ES |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
33afdcc5 | 412 | /* |
d77147ff | 413 | * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. |
33afdcc5 YY |
414 | * |
415 | * Helper function for ext4_setup_new_group_blocks() which set . | |
416 | * | |
417 | * @sb: super block | |
418 | * @handle: journal handle | |
419 | * @flex_gd: flex group data | |
420 | */ | |
421 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
422 | struct ext4_new_flex_group_data *flex_gd, | |
d77147ff | 423 | ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) |
33afdcc5 | 424 | { |
d77147ff | 425 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
426 | ext4_group_t count = last_cluster - first_cluster + 1; | |
33afdcc5 YY |
427 | ext4_group_t count2; |
428 | ||
d77147ff | 429 | ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, |
430 | last_cluster); | |
431 | for (count2 = count; count > 0; | |
432 | count -= count2, first_cluster += count2) { | |
33afdcc5 YY |
433 | ext4_fsblk_t start; |
434 | struct buffer_head *bh; | |
435 | ext4_group_t group; | |
436 | int err; | |
437 | ||
d77147ff | 438 | group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); |
439 | start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); | |
33afdcc5 YY |
440 | group -= flex_gd->groups[0].group; |
441 | ||
d77147ff | 442 | count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); |
33afdcc5 YY |
443 | if (count2 > count) |
444 | count2 = count; | |
445 | ||
446 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
447 | BUG_ON(flex_gd->count > 1); | |
448 | continue; | |
449 | } | |
450 | ||
451 | err = extend_or_restart_transaction(handle, 1); | |
452 | if (err) | |
453 | return err; | |
454 | ||
455 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 456 | if (unlikely(!bh)) |
860d21e2 | 457 | return -ENOMEM; |
33afdcc5 | 458 | |
5d601255 | 459 | BUFFER_TRACE(bh, "get_write_access"); |
33afdcc5 YY |
460 | err = ext4_journal_get_write_access(handle, bh); |
461 | if (err) | |
462 | return err; | |
d77147ff | 463 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", |
464 | first_cluster, first_cluster - start, count2); | |
465 | ext4_set_bits(bh->b_data, first_cluster - start, count2); | |
33afdcc5 YY |
466 | |
467 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
468 | if (unlikely(err)) | |
469 | return err; | |
470 | brelse(bh); | |
471 | } | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
478 | * This doesn't need to be part of the main transaction, since we are only | |
479 | * changing blocks outside the actual filesystem. We still do journaling to | |
480 | * ensure the recovery is correct in case of a failure just after resize. | |
481 | * If any part of this fails, we simply abort the resize. | |
482 | * | |
483 | * setup_new_flex_group_blocks handles a flex group as follow: | |
484 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
485 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
486 | * super block and GDT. | |
487 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
488 | * bitmap for blocks taken by group tables. | |
489 | */ | |
490 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
491 | struct ext4_new_flex_group_data *flex_gd) | |
492 | { | |
493 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
494 | ext4_fsblk_t start; | |
495 | ext4_fsblk_t block; | |
496 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
497 | struct ext4_super_block *es = sbi->s_es; | |
498 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
499 | __u16 *bg_flags = flex_gd->bg_flags; | |
500 | handle_t *handle; | |
501 | ext4_group_t group, count; | |
502 | struct buffer_head *bh = NULL; | |
503 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 504 | int meta_bg; |
33afdcc5 YY |
505 | |
506 | BUG_ON(!flex_gd->count || !group_data || | |
507 | group_data[0].group != sbi->s_groups_count); | |
508 | ||
509 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
e2b911c5 | 510 | meta_bg = ext4_has_feature_meta_bg(sb); |
33afdcc5 YY |
511 | |
512 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 513 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
514 | if (IS_ERR(handle)) |
515 | return PTR_ERR(handle); | |
516 | ||
517 | group = group_data[0].group; | |
518 | for (i = 0; i < flex_gd->count; i++, group++) { | |
519 | unsigned long gdblocks; | |
01f795f9 | 520 | ext4_grpblk_t overhead; |
33afdcc5 YY |
521 | |
522 | gdblocks = ext4_bg_num_gdb(sb, group); | |
523 | start = ext4_group_first_block_no(sb, group); | |
524 | ||
01f795f9 | 525 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
526 | goto handle_itb; |
527 | ||
01f795f9 YY |
528 | if (meta_bg == 1) { |
529 | ext4_group_t first_group; | |
530 | first_group = ext4_meta_bg_first_group(sb, group); | |
531 | if (first_group != group + 1 && | |
532 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
533 | goto handle_itb; | |
534 | } | |
535 | ||
536 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 537 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 538 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
539 | struct buffer_head *gdb; |
540 | ||
541 | ext4_debug("update backup group %#04llx\n", block); | |
542 | err = extend_or_restart_transaction(handle, 1); | |
543 | if (err) | |
544 | goto out; | |
545 | ||
546 | gdb = sb_getblk(sb, block); | |
aebf0243 | 547 | if (unlikely(!gdb)) { |
860d21e2 | 548 | err = -ENOMEM; |
33afdcc5 YY |
549 | goto out; |
550 | } | |
551 | ||
5d601255 | 552 | BUFFER_TRACE(gdb, "get_write_access"); |
33afdcc5 YY |
553 | err = ext4_journal_get_write_access(handle, gdb); |
554 | if (err) { | |
555 | brelse(gdb); | |
556 | goto out; | |
557 | } | |
558 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
559 | gdb->b_size); | |
560 | set_buffer_uptodate(gdb); | |
561 | ||
562 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
563 | if (unlikely(err)) { | |
564 | brelse(gdb); | |
565 | goto out; | |
566 | } | |
567 | brelse(gdb); | |
568 | } | |
569 | ||
570 | /* Zero out all of the reserved backup group descriptor | |
571 | * table blocks | |
572 | */ | |
573 | if (ext4_bg_has_super(sb, group)) { | |
574 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
575 | reserved_gdb, GFP_NOFS); | |
576 | if (err) | |
577 | goto out; | |
578 | } | |
579 | ||
6df935ad | 580 | handle_itb: |
33afdcc5 YY |
581 | /* Initialize group tables of the grop @group */ |
582 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
583 | goto handle_bb; | |
584 | ||
585 | /* Zero out all of the inode table blocks */ | |
586 | block = group_data[i].inode_table; | |
587 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
588 | block, sbi->s_itb_per_group); | |
589 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
590 | GFP_NOFS); | |
591 | if (err) | |
592 | goto out; | |
593 | ||
594 | handle_bb: | |
595 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
596 | goto handle_ib; | |
597 | ||
598 | /* Initialize block bitmap of the @group */ | |
599 | block = group_data[i].block_bitmap; | |
600 | err = extend_or_restart_transaction(handle, 1); | |
601 | if (err) | |
602 | goto out; | |
603 | ||
604 | bh = bclean(handle, sb, block); | |
605 | if (IS_ERR(bh)) { | |
606 | err = PTR_ERR(bh); | |
a9cfcd63 | 607 | bh = NULL; |
33afdcc5 YY |
608 | goto out; |
609 | } | |
01f795f9 YY |
610 | overhead = ext4_group_overhead_blocks(sb, group); |
611 | if (overhead != 0) { | |
33afdcc5 YY |
612 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
613 | start); | |
d77147ff | 614 | ext4_set_bits(bh->b_data, 0, |
615 | EXT4_NUM_B2C(sbi, overhead)); | |
33afdcc5 | 616 | } |
d77147ff | 617 | ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), |
33afdcc5 YY |
618 | sb->s_blocksize * 8, bh->b_data); |
619 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
620 | if (err) | |
621 | goto out; | |
622 | brelse(bh); | |
623 | ||
624 | handle_ib: | |
625 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
626 | continue; | |
627 | ||
628 | /* Initialize inode bitmap of the @group */ | |
629 | block = group_data[i].inode_bitmap; | |
630 | err = extend_or_restart_transaction(handle, 1); | |
631 | if (err) | |
632 | goto out; | |
633 | /* Mark unused entries in inode bitmap used */ | |
634 | bh = bclean(handle, sb, block); | |
635 | if (IS_ERR(bh)) { | |
636 | err = PTR_ERR(bh); | |
a9cfcd63 | 637 | bh = NULL; |
33afdcc5 YY |
638 | goto out; |
639 | } | |
640 | ||
641 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
642 | sb->s_blocksize * 8, bh->b_data); | |
643 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
644 | if (err) | |
645 | goto out; | |
646 | brelse(bh); | |
647 | } | |
648 | bh = NULL; | |
649 | ||
650 | /* Mark group tables in block bitmap */ | |
651 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
652 | count = group_table_count[j]; | |
653 | start = (&group_data[0].block_bitmap)[j]; | |
654 | block = start; | |
655 | for (i = 1; i < flex_gd->count; i++) { | |
656 | block += group_table_count[j]; | |
657 | if (block == (&group_data[i].block_bitmap)[j]) { | |
658 | count += group_table_count[j]; | |
659 | continue; | |
660 | } | |
661 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 662 | flex_gd, |
663 | EXT4_B2C(sbi, start), | |
664 | EXT4_B2C(sbi, | |
665 | start + count | |
666 | - 1)); | |
33afdcc5 YY |
667 | if (err) |
668 | goto out; | |
669 | count = group_table_count[j]; | |
b93c9535 | 670 | start = (&group_data[i].block_bitmap)[j]; |
33afdcc5 YY |
671 | block = start; |
672 | } | |
673 | ||
674 | if (count) { | |
675 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 676 | flex_gd, |
677 | EXT4_B2C(sbi, start), | |
678 | EXT4_B2C(sbi, | |
679 | start + count | |
680 | - 1)); | |
33afdcc5 YY |
681 | if (err) |
682 | goto out; | |
683 | } | |
684 | } | |
685 | ||
686 | out: | |
687 | brelse(bh); | |
688 | err2 = ext4_journal_stop(handle); | |
689 | if (err2 && !err) | |
690 | err = err2; | |
691 | ||
692 | return err; | |
693 | } | |
694 | ||
ac27a0ec DK |
695 | /* |
696 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 697 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
698 | * calling this for the first time. In a sparse filesystem it will be the |
699 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
700 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
701 | */ | |
617ba13b | 702 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
703 | unsigned *five, unsigned *seven) |
704 | { | |
705 | unsigned *min = three; | |
706 | int mult = 3; | |
707 | unsigned ret; | |
708 | ||
e2b911c5 | 709 | if (!ext4_has_feature_sparse_super(sb)) { |
ac27a0ec DK |
710 | ret = *min; |
711 | *min += 1; | |
712 | return ret; | |
713 | } | |
714 | ||
715 | if (*five < *min) { | |
716 | min = five; | |
717 | mult = 5; | |
718 | } | |
719 | if (*seven < *min) { | |
720 | min = seven; | |
721 | mult = 7; | |
722 | } | |
723 | ||
724 | ret = *min; | |
725 | *min *= mult; | |
726 | ||
727 | return ret; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
732 | * It is assumed that they are stored in group order. Returns the number of | |
733 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
734 | */ | |
735 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 736 | ext4_group_t end, |
ac27a0ec DK |
737 | struct buffer_head *primary) |
738 | { | |
617ba13b | 739 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
740 | unsigned three = 1; |
741 | unsigned five = 5; | |
742 | unsigned seven = 7; | |
743 | unsigned grp; | |
744 | __le32 *p = (__le32 *)primary->b_data; | |
745 | int gdbackups = 0; | |
746 | ||
617ba13b | 747 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
748 | if (le32_to_cpu(*p++) != |
749 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 750 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 751 | " missing grp %d (%llu)", |
ac27a0ec | 752 | blk, grp, |
bd81d8ee LV |
753 | grp * |
754 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
755 | blk); | |
ac27a0ec DK |
756 | return -EINVAL; |
757 | } | |
617ba13b | 758 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
759 | return -EFBIG; |
760 | } | |
761 | ||
762 | return gdbackups; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Called when we need to bring a reserved group descriptor table block into | |
767 | * use from the resize inode. The primary copy of the new GDT block currently | |
768 | * is an indirect block (under the double indirect block in the resize inode). | |
769 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
770 | * block, in group order. Even though we know all the block numbers we need, | |
771 | * we check to ensure that the resize inode has actually reserved these blocks. | |
772 | * | |
773 | * Don't need to update the block bitmaps because the blocks are still in use. | |
774 | * | |
775 | * We get all of the error cases out of the way, so that we are sure to not | |
776 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
777 | */ | |
778 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 779 | ext4_group_t group) |
ac27a0ec DK |
780 | { |
781 | struct super_block *sb = inode->i_sb; | |
617ba13b | 782 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 783 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 784 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
785 | struct buffer_head **o_group_desc, **n_group_desc; |
786 | struct buffer_head *dind; | |
2f919710 | 787 | struct buffer_head *gdb_bh; |
ac27a0ec | 788 | int gdbackups; |
617ba13b | 789 | struct ext4_iloc iloc; |
ac27a0ec DK |
790 | __le32 *data; |
791 | int err; | |
792 | ||
793 | if (test_opt(sb, DEBUG)) | |
794 | printk(KERN_DEBUG | |
617ba13b | 795 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
796 | gdb_num); |
797 | ||
2f919710 YY |
798 | gdb_bh = sb_bread(sb, gdblock); |
799 | if (!gdb_bh) | |
ac27a0ec DK |
800 | return -EIO; |
801 | ||
c72df9f9 | 802 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 803 | if (gdbackups < 0) { |
ac27a0ec DK |
804 | err = gdbackups; |
805 | goto exit_bh; | |
806 | } | |
807 | ||
617ba13b | 808 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
809 | dind = sb_bread(sb, le32_to_cpu(*data)); |
810 | if (!dind) { | |
811 | err = -EIO; | |
812 | goto exit_bh; | |
813 | } | |
814 | ||
815 | data = (__le32 *)dind->b_data; | |
617ba13b | 816 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 817 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 818 | group, gdblock); |
ac27a0ec DK |
819 | err = -EINVAL; |
820 | goto exit_dind; | |
821 | } | |
822 | ||
5d601255 | 823 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
b4097142 TT |
824 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
825 | if (unlikely(err)) | |
ac27a0ec DK |
826 | goto exit_dind; |
827 | ||
5d601255 | 828 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
2f919710 | 829 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 830 | if (unlikely(err)) |
37be2f59 | 831 | goto exit_dind; |
ac27a0ec | 832 | |
5d601255 | 833 | BUFFER_TRACE(dind, "get_write_access"); |
b4097142 TT |
834 | err = ext4_journal_get_write_access(handle, dind); |
835 | if (unlikely(err)) | |
836 | ext4_std_error(sb, err); | |
ac27a0ec | 837 | |
617ba13b | 838 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
839 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
840 | if (unlikely(err)) | |
37be2f59 | 841 | goto exit_dind; |
ac27a0ec | 842 | |
f18a5f21 TT |
843 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
844 | sizeof(struct buffer_head *), | |
845 | GFP_NOFS); | |
ac27a0ec DK |
846 | if (!n_group_desc) { |
847 | err = -ENOMEM; | |
f18a5f21 TT |
848 | ext4_warning(sb, "not enough memory for %lu groups", |
849 | gdb_num + 1); | |
ac27a0ec DK |
850 | goto exit_inode; |
851 | } | |
852 | ||
853 | /* | |
854 | * Finally, we have all of the possible failures behind us... | |
855 | * | |
856 | * Remove new GDT block from inode double-indirect block and clear out | |
857 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
858 | * from the reserved inode). We don't need to change the bitmaps for | |
859 | * these blocks, because they are marked as in-use from being in the | |
860 | * reserved inode, and will become GDT blocks (primary and backup). | |
861 | */ | |
617ba13b | 862 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
863 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
864 | if (unlikely(err)) { | |
865 | ext4_std_error(sb, err); | |
866 | goto exit_inode; | |
867 | } | |
d77147ff | 868 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> |
869 | (9 - EXT4_SB(sb)->s_cluster_bits); | |
617ba13b | 870 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
871 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
872 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
873 | if (unlikely(err)) { |
874 | ext4_std_error(sb, err); | |
875 | goto exit_inode; | |
876 | } | |
877 | brelse(dind); | |
ac27a0ec | 878 | |
617ba13b | 879 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 880 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 881 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 882 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
883 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
884 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 885 | kvfree(o_group_desc); |
ac27a0ec | 886 | |
e8546d06 | 887 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 888 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
889 | if (err) |
890 | ext4_std_error(sb, err); | |
ac27a0ec | 891 | |
b4097142 | 892 | return err; |
ac27a0ec DK |
893 | |
894 | exit_inode: | |
b93b41d4 | 895 | kvfree(n_group_desc); |
ac27a0ec | 896 | brelse(iloc.bh); |
ac27a0ec DK |
897 | exit_dind: |
898 | brelse(dind); | |
899 | exit_bh: | |
2f919710 | 900 | brelse(gdb_bh); |
ac27a0ec | 901 | |
617ba13b | 902 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
903 | return err; |
904 | } | |
905 | ||
01f795f9 YY |
906 | /* |
907 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
908 | */ | |
909 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
910 | handle_t *handle, ext4_group_t group) { | |
911 | ext4_fsblk_t gdblock; | |
912 | struct buffer_head *gdb_bh; | |
913 | struct buffer_head **o_group_desc, **n_group_desc; | |
914 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
915 | int err; | |
916 | ||
917 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
918 | ext4_bg_has_super(sb, group); | |
919 | gdb_bh = sb_bread(sb, gdblock); | |
920 | if (!gdb_bh) | |
921 | return -EIO; | |
922 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * | |
923 | sizeof(struct buffer_head *), | |
924 | GFP_NOFS); | |
925 | if (!n_group_desc) { | |
926 | err = -ENOMEM; | |
927 | ext4_warning(sb, "not enough memory for %lu groups", | |
928 | gdb_num + 1); | |
929 | return err; | |
930 | } | |
931 | ||
932 | o_group_desc = EXT4_SB(sb)->s_group_desc; | |
933 | memcpy(n_group_desc, o_group_desc, | |
934 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
935 | n_group_desc[gdb_num] = gdb_bh; | |
936 | EXT4_SB(sb)->s_group_desc = n_group_desc; | |
937 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 938 | kvfree(o_group_desc); |
5d601255 | 939 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
01f795f9 YY |
940 | err = ext4_journal_get_write_access(handle, gdb_bh); |
941 | if (unlikely(err)) | |
942 | brelse(gdb_bh); | |
943 | return err; | |
944 | } | |
945 | ||
ac27a0ec DK |
946 | /* |
947 | * Called when we are adding a new group which has a backup copy of each of | |
948 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
949 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
950 | * that they are kept for future resizing and not allocated to files. | |
951 | * | |
952 | * Each reserved backup GDT block will go into a different indirect block. | |
953 | * The indirect blocks are actually the primary reserved GDT blocks, | |
954 | * so we know in advance what their block numbers are. We only get the | |
955 | * double-indirect block to verify it is pointing to the primary reserved | |
956 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
957 | * backup GDT blocks are stored in their reserved primary GDT block. | |
958 | */ | |
959 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 960 | ext4_group_t group) |
ac27a0ec DK |
961 | { |
962 | struct super_block *sb = inode->i_sb; | |
617ba13b | 963 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
d77147ff | 964 | int cluster_bits = EXT4_SB(sb)->s_cluster_bits; |
ac27a0ec DK |
965 | struct buffer_head **primary; |
966 | struct buffer_head *dind; | |
617ba13b MC |
967 | struct ext4_iloc iloc; |
968 | ext4_fsblk_t blk; | |
ac27a0ec DK |
969 | __le32 *data, *end; |
970 | int gdbackups = 0; | |
971 | int res, i; | |
972 | int err; | |
973 | ||
6da2ec56 | 974 | primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
975 | if (!primary) |
976 | return -ENOMEM; | |
977 | ||
617ba13b | 978 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
979 | dind = sb_bread(sb, le32_to_cpu(*data)); |
980 | if (!dind) { | |
981 | err = -EIO; | |
982 | goto exit_free; | |
983 | } | |
984 | ||
617ba13b | 985 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
986 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
987 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 988 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
989 | |
990 | /* Get each reserved primary GDT block and verify it holds backups */ | |
991 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
992 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 993 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
994 | " not at offset %ld", |
995 | blk, | |
996 | (long)(data - (__le32 *)dind->b_data)); | |
997 | err = -EINVAL; | |
998 | goto exit_bh; | |
999 | } | |
1000 | primary[res] = sb_bread(sb, blk); | |
1001 | if (!primary[res]) { | |
1002 | err = -EIO; | |
1003 | goto exit_bh; | |
1004 | } | |
c72df9f9 YY |
1005 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
1006 | if (gdbackups < 0) { | |
ac27a0ec DK |
1007 | brelse(primary[res]); |
1008 | err = gdbackups; | |
1009 | goto exit_bh; | |
1010 | } | |
1011 | if (++data >= end) | |
1012 | data = (__le32 *)dind->b_data; | |
1013 | } | |
1014 | ||
1015 | for (i = 0; i < reserved_gdb; i++) { | |
5d601255 | 1016 | BUFFER_TRACE(primary[i], "get_write_access"); |
37be2f59 | 1017 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 1018 | goto exit_bh; |
ac27a0ec DK |
1019 | } |
1020 | ||
617ba13b | 1021 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
1022 | goto exit_bh; |
1023 | ||
1024 | /* | |
1025 | * Finally we can add each of the reserved backup GDT blocks from | |
1026 | * the new group to its reserved primary GDT block. | |
1027 | */ | |
668f4dc5 | 1028 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1029 | for (i = 0; i < reserved_gdb; i++) { |
1030 | int err2; | |
1031 | data = (__le32 *)primary[i]->b_data; | |
1032 | /* printk("reserving backup %lu[%u] = %lu\n", | |
1033 | primary[i]->b_blocknr, gdbackups, | |
1034 | blk + primary[i]->b_blocknr); */ | |
1035 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 1036 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
1037 | if (!err) |
1038 | err = err2; | |
1039 | } | |
d77147ff | 1040 | |
1041 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); | |
617ba13b | 1042 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
1043 | |
1044 | exit_bh: | |
1045 | while (--res >= 0) | |
1046 | brelse(primary[res]); | |
1047 | brelse(dind); | |
1048 | ||
1049 | exit_free: | |
1050 | kfree(primary); | |
1051 | ||
1052 | return err; | |
1053 | } | |
1054 | ||
1055 | /* | |
617ba13b | 1056 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1057 | * of the main resize transaction, because e2fsck will re-write them if there |
1058 | * is a problem (basically only OOM will cause a problem). However, we | |
1059 | * _should_ update the backups if possible, in case the primary gets trashed | |
1060 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1061 | * important part is that the new block and inode counts are in the backup | |
1062 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1063 | * | |
32ed5058 TT |
1064 | * We do not need take the s_resize_lock for this, because these |
1065 | * blocks are not otherwise touched by the filesystem code when it is | |
1066 | * mounted. We don't need to worry about last changing from | |
1067 | * sbi->s_groups_count, because the worst that can happen is that we | |
1068 | * do not copy the full number of backups at this time. The resize | |
1069 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1070 | */ |
904dad47 | 1071 | static void update_backups(struct super_block *sb, sector_t blk_off, char *data, |
01f795f9 | 1072 | int size, int meta_bg) |
ac27a0ec | 1073 | { |
617ba13b | 1074 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1075 | ext4_group_t last; |
617ba13b | 1076 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1077 | unsigned three = 1; |
1078 | unsigned five = 5; | |
1079 | unsigned seven = 7; | |
01f795f9 | 1080 | ext4_group_t group = 0; |
ac27a0ec DK |
1081 | int rest = sb->s_blocksize - size; |
1082 | handle_t *handle; | |
1083 | int err = 0, err2; | |
1084 | ||
9924a92a | 1085 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1086 | if (IS_ERR(handle)) { |
1087 | group = 1; | |
1088 | err = PTR_ERR(handle); | |
1089 | goto exit_err; | |
1090 | } | |
1091 | ||
01f795f9 YY |
1092 | if (meta_bg == 0) { |
1093 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1094 | last = sbi->s_groups_count; | |
1095 | } else { | |
904dad47 | 1096 | group = ext4_get_group_number(sb, blk_off) + 1; |
01f795f9 YY |
1097 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); |
1098 | } | |
1099 | ||
1100 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1101 | struct buffer_head *bh; |
01f795f9 | 1102 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1103 | |
1104 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1105 | if (ext4_handle_valid(handle) && |
1106 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1107 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1108 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1109 | break; |
1110 | ||
01f795f9 | 1111 | if (meta_bg == 0) |
9378c676 | 1112 | backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; |
01f795f9 YY |
1113 | else |
1114 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1115 | ext4_bg_has_super(sb, group)); | |
1116 | ||
1117 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1118 | if (unlikely(!bh)) { |
860d21e2 | 1119 | err = -ENOMEM; |
ac27a0ec DK |
1120 | break; |
1121 | } | |
01f795f9 YY |
1122 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1123 | backup_block, backup_block - | |
1124 | ext4_group_first_block_no(sb, group)); | |
5d601255 | 1125 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 1126 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1127 | break; |
1128 | lock_buffer(bh); | |
1129 | memcpy(bh->b_data, data, size); | |
1130 | if (rest) | |
1131 | memset(bh->b_data + size, 0, rest); | |
1132 | set_buffer_uptodate(bh); | |
1133 | unlock_buffer(bh); | |
b4097142 TT |
1134 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1135 | if (unlikely(err)) | |
1136 | ext4_std_error(sb, err); | |
ac27a0ec | 1137 | brelse(bh); |
01f795f9 YY |
1138 | |
1139 | if (meta_bg == 0) | |
1140 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1141 | else if (group == last) | |
1142 | break; | |
1143 | else | |
1144 | group = last; | |
ac27a0ec | 1145 | } |
617ba13b | 1146 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1147 | err = err2; |
1148 | ||
1149 | /* | |
1150 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1151 | * late to revert the resize, we shouldn't fail just because of | |
1152 | * the backup copies (they are only needed in case of corruption). | |
1153 | * | |
1154 | * However, if we got here we have a journal problem too, so we | |
1155 | * can't really start a transaction to mark the superblock. | |
1156 | * Chicken out and just set the flag on the hope it will be written | |
1157 | * to disk, and if not - we will simply wait until next fsck. | |
1158 | */ | |
1159 | exit_err: | |
1160 | if (err) { | |
12062ddd | 1161 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1162 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1163 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1164 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1165 | mark_buffer_dirty(sbi->s_sbh); |
1166 | } | |
1167 | } | |
1168 | ||
bb08c1e7 YY |
1169 | /* |
1170 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1171 | * starting at @group | |
1172 | * | |
1173 | * @handle: journal handle | |
1174 | * @sb: super block | |
1175 | * @group: the group no. of the first group desc to be added | |
1176 | * @resize_inode: the resize inode | |
1177 | * @count: number of group descriptors to be added | |
1178 | */ | |
1179 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1180 | ext4_group_t group, struct inode *resize_inode, | |
1181 | ext4_group_t count) | |
1182 | { | |
1183 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1184 | struct ext4_super_block *es = sbi->s_es; | |
1185 | struct buffer_head *gdb_bh; | |
1186 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1187 | int meta_bg; |
bb08c1e7 | 1188 | |
e2b911c5 | 1189 | meta_bg = ext4_has_feature_meta_bg(sb); |
bb08c1e7 YY |
1190 | for (i = 0; i < count; i++, group++) { |
1191 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1192 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1193 | ||
1194 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1195 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1196 | ||
1197 | /* | |
1198 | * We will only either add reserved group blocks to a backup group | |
1199 | * or remove reserved blocks for the first group in a new group block. | |
1200 | * Doing both would be mean more complex code, and sane people don't | |
1201 | * use non-sparse filesystems anymore. This is already checked above. | |
1202 | */ | |
1203 | if (gdb_off) { | |
1204 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
5d601255 | 1205 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
bb08c1e7 YY |
1206 | err = ext4_journal_get_write_access(handle, gdb_bh); |
1207 | ||
1208 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1209 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1210 | } else if (meta_bg != 0) { |
1211 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1212 | } else { | |
bb08c1e7 | 1213 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1214 | } |
bb08c1e7 YY |
1215 | if (err) |
1216 | break; | |
1217 | } | |
1218 | return err; | |
1219 | } | |
1220 | ||
41a246d1 DW |
1221 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1222 | { | |
1223 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1224 | if (unlikely(!bh)) |
41a246d1 | 1225 | return NULL; |
7f1468d1 DM |
1226 | if (!bh_uptodate_or_lock(bh)) { |
1227 | if (bh_submit_read(bh) < 0) { | |
1228 | brelse(bh); | |
1229 | return NULL; | |
1230 | } | |
41a246d1 | 1231 | } |
41a246d1 DW |
1232 | |
1233 | return bh; | |
1234 | } | |
1235 | ||
1236 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1237 | ext4_group_t group, | |
1238 | struct ext4_group_desc *gdp, | |
1239 | struct ext4_new_group_data *group_data) | |
1240 | { | |
1241 | struct buffer_head *bh; | |
1242 | ||
9aa5d32b | 1243 | if (!ext4_has_metadata_csum(sb)) |
41a246d1 DW |
1244 | return 0; |
1245 | ||
1246 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1247 | if (!bh) | |
1248 | return -EIO; | |
1249 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1250 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1251 | brelse(bh); | |
1252 | ||
fa77dcfa DW |
1253 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1254 | if (!bh) | |
1255 | return -EIO; | |
79f1ba49 | 1256 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1257 | brelse(bh); |
1258 | ||
41a246d1 DW |
1259 | return 0; |
1260 | } | |
1261 | ||
083f5b24 YY |
1262 | /* |
1263 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1264 | */ | |
1265 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1266 | struct ext4_new_flex_group_data *flex_gd) | |
1267 | { | |
1268 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1269 | struct ext4_group_desc *gdp; | |
1270 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1271 | struct buffer_head *gdb_bh; | |
1272 | ext4_group_t group; | |
1273 | __u16 *bg_flags = flex_gd->bg_flags; | |
1274 | int i, gdb_off, gdb_num, err = 0; | |
d77147ff | 1275 | |
083f5b24 YY |
1276 | |
1277 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1278 | group = group_data->group; | |
1279 | ||
1280 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1281 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1282 | ||
1283 | /* | |
1284 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1285 | */ | |
1286 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1287 | /* Update group descriptor block for new group */ | |
2716b802 | 1288 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1289 | gdb_off * EXT4_DESC_SIZE(sb)); |
1290 | ||
1291 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1292 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1293 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1294 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1295 | if (err) { | |
1296 | ext4_std_error(sb, err); | |
1297 | break; | |
1298 | } | |
1299 | ||
083f5b24 YY |
1300 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1301 | ext4_free_group_clusters_set(sb, gdp, | |
d77147ff | 1302 | group_data->free_clusters_count); |
083f5b24 | 1303 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1304 | if (ext4_has_group_desc_csum(sb)) |
1305 | ext4_itable_unused_set(sb, gdp, | |
1306 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1307 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1308 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1309 | |
1310 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1311 | if (unlikely(err)) { | |
1312 | ext4_std_error(sb, err); | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * We can allocate memory for mb_alloc based on the new group | |
1318 | * descriptor | |
1319 | */ | |
1320 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1321 | if (err) | |
1322 | break; | |
1323 | } | |
1324 | return err; | |
1325 | } | |
1326 | ||
2e10e2f2 YY |
1327 | /* |
1328 | * ext4_update_super() updates the super block so that the newly added | |
1329 | * groups can be seen by the filesystem. | |
1330 | * | |
1331 | * @sb: super block | |
1332 | * @flex_gd: new added groups | |
1333 | */ | |
1334 | static void ext4_update_super(struct super_block *sb, | |
1335 | struct ext4_new_flex_group_data *flex_gd) | |
1336 | { | |
1337 | ext4_fsblk_t blocks_count = 0; | |
1338 | ext4_fsblk_t free_blocks = 0; | |
1339 | ext4_fsblk_t reserved_blocks = 0; | |
1340 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1341 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1342 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1343 | int i; |
2e10e2f2 YY |
1344 | |
1345 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1346 | /* | |
1347 | * Make the new blocks and inodes valid next. We do this before | |
1348 | * increasing the group count so that once the group is enabled, | |
1349 | * all of its blocks and inodes are already valid. | |
1350 | * | |
1351 | * We always allocate group-by-group, then block-by-block or | |
1352 | * inode-by-inode within a group, so enabling these | |
1353 | * blocks/inodes before the group is live won't actually let us | |
1354 | * allocate the new space yet. | |
1355 | */ | |
1356 | for (i = 0; i < flex_gd->count; i++) { | |
1357 | blocks_count += group_data[i].blocks_count; | |
d77147ff | 1358 | free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); |
2e10e2f2 YY |
1359 | } |
1360 | ||
1361 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1362 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1363 | reserved_blocks *= blocks_count; |
1364 | do_div(reserved_blocks, 100); | |
1365 | ||
1366 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1367 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1368 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1369 | flex_gd->count); | |
636d7e2e DW |
1370 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1371 | flex_gd->count); | |
2e10e2f2 | 1372 | |
01f795f9 | 1373 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1374 | /* |
1375 | * We need to protect s_groups_count against other CPUs seeing | |
1376 | * inconsistent state in the superblock. | |
1377 | * | |
1378 | * The precise rules we use are: | |
1379 | * | |
1380 | * * Writers must perform a smp_wmb() after updating all | |
1381 | * dependent data and before modifying the groups count | |
1382 | * | |
1383 | * * Readers must perform an smp_rmb() after reading the groups | |
1384 | * count and before reading any dependent data. | |
1385 | * | |
1386 | * NB. These rules can be relaxed when checking the group count | |
1387 | * while freeing data, as we can only allocate from a block | |
1388 | * group after serialising against the group count, and we can | |
1389 | * only then free after serialising in turn against that | |
1390 | * allocation. | |
1391 | */ | |
1392 | smp_wmb(); | |
1393 | ||
1394 | /* Update the global fs size fields */ | |
1395 | sbi->s_groups_count += flex_gd->count; | |
c5c72d81 TT |
1396 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
1397 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
2e10e2f2 YY |
1398 | |
1399 | /* Update the reserved block counts only once the new group is | |
1400 | * active. */ | |
1401 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1402 | reserved_blocks); | |
1403 | ||
1404 | /* Update the free space counts */ | |
1405 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1406 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1407 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1408 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1409 | ||
01f795f9 YY |
1410 | ext4_debug("free blocks count %llu", |
1411 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
e2b911c5 | 1412 | if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { |
2e10e2f2 YY |
1413 | ext4_group_t flex_group; |
1414 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
90ba983f TT |
1415 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
1416 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2e10e2f2 YY |
1417 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
1418 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1419 | } | |
1420 | ||
952fc18e TT |
1421 | /* |
1422 | * Update the fs overhead information | |
1423 | */ | |
1424 | ext4_calculate_overhead(sb); | |
1425 | ||
2e10e2f2 YY |
1426 | if (test_opt(sb, DEBUG)) |
1427 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1428 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1429 | blocks_count, free_blocks, reserved_blocks); | |
1430 | } | |
1431 | ||
4bac1f8c YY |
1432 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1433 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1434 | * transaction and not have it write the data to disk. | |
1435 | */ | |
1436 | static int ext4_flex_group_add(struct super_block *sb, | |
1437 | struct inode *resize_inode, | |
1438 | struct ext4_new_flex_group_data *flex_gd) | |
1439 | { | |
1440 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1441 | struct ext4_super_block *es = sbi->s_es; | |
1442 | ext4_fsblk_t o_blocks_count; | |
1443 | ext4_grpblk_t last; | |
1444 | ext4_group_t group; | |
1445 | handle_t *handle; | |
1446 | unsigned reserved_gdb; | |
1447 | int err = 0, err2 = 0, credit; | |
1448 | ||
1449 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1450 | ||
1451 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1452 | o_blocks_count = ext4_blocks_count(es); | |
1453 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1454 | BUG_ON(last); | |
1455 | ||
1456 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1457 | if (err) | |
1458 | goto exit; | |
1459 | /* | |
1460 | * We will always be modifying at least the superblock and GDT | |
2c869b26 | 1461 | * blocks. If we are adding a group past the last current GDT block, |
4bac1f8c YY |
1462 | * we will also modify the inode and the dindirect block. If we |
1463 | * are adding a group with superblock/GDT backups we will also | |
1464 | * modify each of the reserved GDT dindirect blocks. | |
1465 | */ | |
2c869b26 JK |
1466 | credit = 3; /* sb, resize inode, resize inode dindirect */ |
1467 | /* GDT blocks */ | |
1468 | credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); | |
1469 | credit += reserved_gdb; /* Reserved GDT dindirect blocks */ | |
9924a92a | 1470 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1471 | if (IS_ERR(handle)) { |
1472 | err = PTR_ERR(handle); | |
1473 | goto exit; | |
1474 | } | |
1475 | ||
5d601255 | 1476 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
4bac1f8c YY |
1477 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1478 | if (err) | |
1479 | goto exit_journal; | |
1480 | ||
1481 | group = flex_gd->groups[0].group; | |
49598e04 | 1482 | BUG_ON(group != sbi->s_groups_count); |
4bac1f8c YY |
1483 | err = ext4_add_new_descs(handle, sb, group, |
1484 | resize_inode, flex_gd->count); | |
1485 | if (err) | |
1486 | goto exit_journal; | |
1487 | ||
1488 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1489 | if (err) | |
1490 | goto exit_journal; | |
1491 | ||
1492 | ext4_update_super(sb, flex_gd); | |
1493 | ||
1494 | err = ext4_handle_dirty_super(handle, sb); | |
1495 | ||
1496 | exit_journal: | |
1497 | err2 = ext4_journal_stop(handle); | |
1498 | if (!err) | |
1499 | err = err2; | |
1500 | ||
1501 | if (!err) { | |
2ebd1704 YY |
1502 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1503 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1504 | EXT4_DESC_PER_BLOCK(sb)); | |
e2b911c5 | 1505 | int meta_bg = ext4_has_feature_meta_bg(sb); |
0acdb887 | 1506 | sector_t old_gdb = 0; |
2ebd1704 | 1507 | |
4bac1f8c | 1508 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1509 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1510 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1511 | struct buffer_head *gdb_bh; |
2ebd1704 | 1512 | |
4bac1f8c | 1513 | gdb_bh = sbi->s_group_desc[gdb_num]; |
0acdb887 TM |
1514 | if (old_gdb == gdb_bh->b_blocknr) |
1515 | continue; | |
4bac1f8c | 1516 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1517 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1518 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1519 | } |
1520 | } | |
1521 | exit: | |
1522 | return err; | |
1523 | } | |
1524 | ||
19c5246d YY |
1525 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1526 | struct ext4_new_flex_group_data *flex_gd, | |
1527 | ext4_fsblk_t n_blocks_count, | |
1528 | unsigned long flexbg_size) | |
1529 | { | |
d77147ff | 1530 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1531 | struct ext4_super_block *es = sbi->s_es; | |
19c5246d YY |
1532 | struct ext4_new_group_data *group_data = flex_gd->groups; |
1533 | ext4_fsblk_t o_blocks_count; | |
1534 | ext4_group_t n_group; | |
1535 | ext4_group_t group; | |
1536 | ext4_group_t last_group; | |
1537 | ext4_grpblk_t last; | |
d77147ff | 1538 | ext4_grpblk_t clusters_per_group; |
19c5246d YY |
1539 | unsigned long i; |
1540 | ||
d77147ff | 1541 | clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); |
19c5246d YY |
1542 | |
1543 | o_blocks_count = ext4_blocks_count(es); | |
1544 | ||
1545 | if (o_blocks_count == n_blocks_count) | |
1546 | return 0; | |
1547 | ||
1548 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1549 | BUG_ON(last); | |
1550 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1551 | ||
1552 | last_group = group | (flexbg_size - 1); | |
1553 | if (last_group > n_group) | |
1554 | last_group = n_group; | |
1555 | ||
1556 | flex_gd->count = last_group - group + 1; | |
1557 | ||
1558 | for (i = 0; i < flex_gd->count; i++) { | |
1559 | int overhead; | |
1560 | ||
1561 | group_data[i].group = group + i; | |
d77147ff | 1562 | group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); |
01f795f9 | 1563 | overhead = ext4_group_overhead_blocks(sb, group + i); |
d77147ff | 1564 | group_data[i].mdata_blocks = overhead; |
1565 | group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); | |
7f511862 | 1566 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1567 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1568 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1569 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1570 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1571 | } else | |
19c5246d YY |
1572 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1573 | } | |
1574 | ||
feb0ab32 | 1575 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1576 | /* We need to initialize block bitmap of last group. */ |
1577 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1578 | ||
d77147ff | 1579 | if ((last_group == n_group) && (last != clusters_per_group - 1)) { |
1580 | group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); | |
1581 | group_data[i - 1].free_clusters_count -= clusters_per_group - | |
1582 | last - 1; | |
19c5246d YY |
1583 | } |
1584 | ||
1585 | return 1; | |
1586 | } | |
1587 | ||
ac27a0ec DK |
1588 | /* Add group descriptor data to an existing or new group descriptor block. |
1589 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1590 | * the filesystem, because we cannot abort the transaction and not have it | |
1591 | * write the data to disk. | |
1592 | * | |
1593 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1594 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1595 | * | |
1596 | * We only need to hold the superblock lock while we are actually adding | |
1597 | * in the new group's counts to the superblock. Prior to that we have | |
1598 | * not really "added" the group at all. We re-check that we are still | |
1599 | * adding in the last group in case things have changed since verifying. | |
1600 | */ | |
617ba13b | 1601 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1602 | { |
61f296cc | 1603 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1604 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1605 | struct ext4_super_block *es = sbi->s_es; | |
1606 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1607 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1608 | struct inode *inode = NULL; |
03b40e34 | 1609 | int gdb_off; |
61f296cc YY |
1610 | int err; |
1611 | __u16 bg_flags = 0; | |
ac27a0ec | 1612 | |
617ba13b | 1613 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
ac27a0ec | 1614 | |
e2b911c5 | 1615 | if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { |
12062ddd | 1616 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1617 | return -EPERM; |
1618 | } | |
1619 | ||
bd81d8ee LV |
1620 | if (ext4_blocks_count(es) + input->blocks_count < |
1621 | ext4_blocks_count(es)) { | |
12062ddd | 1622 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1623 | return -EINVAL; |
1624 | } | |
1625 | ||
617ba13b | 1626 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1627 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1628 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1629 | return -EINVAL; |
1630 | } | |
1631 | ||
1632 | if (reserved_gdb || gdb_off == 0) { | |
e2b911c5 DW |
1633 | if (ext4_has_feature_resize_inode(sb) || |
1634 | !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1635 | ext4_warning(sb, |
ac27a0ec DK |
1636 | "No reserved GDT blocks, can't resize"); |
1637 | return -EPERM; | |
1638 | } | |
1d1fe1ee DH |
1639 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1640 | if (IS_ERR(inode)) { | |
12062ddd | 1641 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1642 | return PTR_ERR(inode); |
ac27a0ec DK |
1643 | } |
1644 | } | |
1645 | ||
920313a7 | 1646 | |
61f296cc | 1647 | err = verify_group_input(sb, input); |
08c3a813 | 1648 | if (err) |
61f296cc | 1649 | goto out; |
ac27a0ec | 1650 | |
117fff10 TT |
1651 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1652 | if (err) | |
7f511862 | 1653 | goto out; |
117fff10 | 1654 | |
28623c2f TT |
1655 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1656 | if (err) | |
1657 | goto out; | |
1658 | ||
61f296cc YY |
1659 | flex_gd.count = 1; |
1660 | flex_gd.groups = input; | |
1661 | flex_gd.bg_flags = &bg_flags; | |
1662 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1663 | out: | |
ac27a0ec DK |
1664 | iput(inode); |
1665 | return err; | |
617ba13b | 1666 | } /* ext4_group_add */ |
ac27a0ec | 1667 | |
18e31438 YY |
1668 | /* |
1669 | * extend a group without checking assuming that checking has been done. | |
1670 | */ | |
1671 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1672 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1673 | { | |
1674 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1675 | handle_t *handle; | |
1676 | int err = 0, err2; | |
1677 | ||
1678 | /* We will update the superblock, one block bitmap, and | |
1679 | * one group descriptor via ext4_group_add_blocks(). | |
1680 | */ | |
9924a92a | 1681 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1682 | if (IS_ERR(handle)) { |
1683 | err = PTR_ERR(handle); | |
1684 | ext4_warning(sb, "error %d on journal start", err); | |
1685 | return err; | |
1686 | } | |
1687 | ||
5d601255 | 1688 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
18e31438 YY |
1689 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
1690 | if (err) { | |
1691 | ext4_warning(sb, "error %d on journal write access", err); | |
1692 | goto errout; | |
1693 | } | |
1694 | ||
1695 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1696 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1697 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1698 | o_blocks_count + add); | |
1699 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1700 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1701 | if (err) | |
1702 | goto errout; | |
1703 | ext4_handle_dirty_super(handle, sb); | |
1704 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1705 | o_blocks_count + add); | |
1706 | errout: | |
1707 | err2 = ext4_journal_stop(handle); | |
1708 | if (err2 && !err) | |
1709 | err = err2; | |
1710 | ||
1711 | if (!err) { | |
1712 | if (test_opt(sb, DEBUG)) | |
1713 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1714 | "blocks\n", ext4_blocks_count(es)); | |
6ca792ed | 1715 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
01f795f9 | 1716 | (char *)es, sizeof(struct ext4_super_block), 0); |
18e31438 YY |
1717 | } |
1718 | return err; | |
1719 | } | |
1720 | ||
2b2d6d01 TT |
1721 | /* |
1722 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1723 | * point is only used to extend the current filesystem to the end of the last |
1724 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1725 | * for emergencies (because it has no dependencies on reserved blocks). | |
1726 | * | |
617ba13b | 1727 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1728 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1729 | * GDT blocks are reserved to grow to the desired size. | |
1730 | */ | |
617ba13b MC |
1731 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1732 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1733 | { |
617ba13b | 1734 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1735 | ext4_grpblk_t last; |
1736 | ext4_grpblk_t add; | |
af5bc92d | 1737 | struct buffer_head *bh; |
d89651c8 | 1738 | int err; |
5f21b0e6 | 1739 | ext4_group_t group; |
ac27a0ec | 1740 | |
bd81d8ee | 1741 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1742 | |
1743 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1744 | ext4_msg(sb, KERN_DEBUG, |
1745 | "extending last group from %llu to %llu blocks", | |
1746 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1747 | |
1748 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1749 | return 0; | |
1750 | ||
1751 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1752 | ext4_msg(sb, KERN_ERR, |
1753 | "filesystem too large to resize to %llu blocks safely", | |
1754 | n_blocks_count); | |
ac27a0ec | 1755 | if (sizeof(sector_t) < 8) |
12062ddd | 1756 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1757 | return -EINVAL; |
1758 | } | |
1759 | ||
1760 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1761 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1762 | return -EINVAL; |
ac27a0ec DK |
1763 | } |
1764 | ||
1765 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1766 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1767 | |
1768 | if (last == 0) { | |
12062ddd | 1769 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1770 | return -EPERM; |
1771 | } | |
1772 | ||
617ba13b | 1773 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1774 | |
1775 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1776 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1777 | return -EINVAL; |
1778 | } | |
1779 | ||
1780 | if (o_blocks_count + add > n_blocks_count) | |
1781 | add = n_blocks_count - o_blocks_count; | |
1782 | ||
1783 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1784 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1785 | o_blocks_count + add, add); |
1786 | ||
1787 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1788 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1789 | if (!bh) { |
12062ddd | 1790 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1791 | return -ENOSPC; |
1792 | } | |
1793 | brelse(bh); | |
1794 | ||
d89651c8 | 1795 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1796 | return err; |
617ba13b | 1797 | } /* ext4_group_extend */ |
19c5246d | 1798 | |
1c6bd717 TT |
1799 | |
1800 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1801 | { | |
1802 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1803 | } | |
1804 | ||
1805 | /* | |
1806 | * Release the resize inode and drop the resize_inode feature if there | |
1807 | * are no more reserved gdt blocks, and then convert the file system | |
1808 | * to enable meta_bg | |
1809 | */ | |
1810 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1811 | { | |
1812 | handle_t *handle; | |
1813 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1814 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1815 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1816 | ext4_fsblk_t nr; |
1817 | int i, ret, err = 0; | |
1818 | int credits = 1; | |
1819 | ||
1820 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1821 | if (inode) { |
1c6bd717 TT |
1822 | if (es->s_reserved_gdt_blocks) { |
1823 | ext4_error(sb, "Unexpected non-zero " | |
1824 | "s_reserved_gdt_blocks"); | |
1825 | return -EPERM; | |
1826 | } | |
1c6bd717 TT |
1827 | |
1828 | /* Do a quick sanity check of the resize inode */ | |
d77147ff | 1829 | if (inode->i_blocks != 1 << (inode->i_blkbits - |
1830 | (9 - sbi->s_cluster_bits))) | |
1c6bd717 TT |
1831 | goto invalid_resize_inode; |
1832 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1833 | if (i == EXT4_DIND_BLOCK) { | |
1834 | if (ei->i_data[i]) | |
1835 | continue; | |
1836 | else | |
1837 | goto invalid_resize_inode; | |
1838 | } | |
1839 | if (ei->i_data[i]) | |
1840 | goto invalid_resize_inode; | |
1841 | } | |
1842 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1843 | } | |
1844 | ||
9924a92a | 1845 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1846 | if (IS_ERR(handle)) |
1847 | return PTR_ERR(handle); | |
1848 | ||
5d601255 | 1849 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
1c6bd717 TT |
1850 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1851 | if (err) | |
1852 | goto errout; | |
1853 | ||
e2b911c5 DW |
1854 | ext4_clear_feature_resize_inode(sb); |
1855 | ext4_set_feature_meta_bg(sb); | |
1c6bd717 TT |
1856 | sbi->s_es->s_first_meta_bg = |
1857 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
1858 | ||
1859 | err = ext4_handle_dirty_super(handle, sb); | |
1860 | if (err) { | |
1861 | ext4_std_error(sb, err); | |
1862 | goto errout; | |
1863 | } | |
1864 | ||
1865 | if (inode) { | |
1866 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1867 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1868 | EXT4_FREE_BLOCKS_METADATA | | |
1869 | EXT4_FREE_BLOCKS_FORGET); | |
1870 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1871 | inode->i_blocks = 0; | |
1872 | ||
1873 | err = ext4_mark_inode_dirty(handle, inode); | |
1874 | if (err) | |
1875 | ext4_std_error(sb, err); | |
1876 | } | |
1877 | ||
1878 | errout: | |
1879 | ret = ext4_journal_stop(handle); | |
1880 | if (!err) | |
1881 | err = ret; | |
1882 | return ret; | |
1883 | ||
1884 | invalid_resize_inode: | |
1885 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1886 | return -EINVAL; | |
1887 | } | |
1888 | ||
19c5246d YY |
1889 | /* |
1890 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1891 | * | |
1892 | * @sb: super block of the fs to be resized | |
1893 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1894 | */ | |
1895 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1896 | { | |
1897 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1898 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1899 | struct ext4_super_block *es = sbi->s_es; | |
1900 | struct buffer_head *bh; | |
01f795f9 YY |
1901 | struct inode *resize_inode = NULL; |
1902 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1903 | unsigned long n_desc_blocks; |
1904 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1905 | ext4_group_t o_group; |
1906 | ext4_group_t n_group; | |
1907 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1908 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1909 | unsigned long last_update_time = 0; |
117fff10 | 1910 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1911 | int meta_bg; |
19c5246d | 1912 | |
59e31c15 TT |
1913 | /* See if the device is actually as big as what was requested */ |
1914 | bh = sb_bread(sb, n_blocks_count - 1); | |
1915 | if (!bh) { | |
1916 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1917 | return -ENOSPC; | |
1918 | } | |
1919 | brelse(bh); | |
1920 | ||
1c6bd717 | 1921 | retry: |
19c5246d YY |
1922 | o_blocks_count = ext4_blocks_count(es); |
1923 | ||
59e31c15 TT |
1924 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1925 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1926 | |
1927 | if (n_blocks_count < o_blocks_count) { | |
1928 | /* On-line shrinking not supported */ | |
1929 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1930 | return -EINVAL; | |
1931 | } | |
1932 | ||
1933 | if (n_blocks_count == o_blocks_count) | |
1934 | /* Nothing need to do */ | |
1935 | return 0; | |
1936 | ||
bd86298e | 1937 | n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
4f2f76f7 | 1938 | if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
3f8a6411 TT |
1939 | ext4_warning(sb, "resize would cause inodes_count overflow"); |
1940 | return -EINVAL; | |
1941 | } | |
a0ade1de | 1942 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1943 | |
1c6bd717 TT |
1944 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1945 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1946 | |
e2b911c5 | 1947 | meta_bg = ext4_has_feature_meta_bg(sb); |
19c5246d | 1948 | |
e2b911c5 | 1949 | if (ext4_has_feature_resize_inode(sb)) { |
01f795f9 YY |
1950 | if (meta_bg) { |
1951 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1952 | "simultaneously"); | |
1953 | return -EINVAL; | |
1954 | } | |
1c6bd717 TT |
1955 | if (n_desc_blocks > o_desc_blocks + |
1956 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1957 | n_blocks_count_retry = n_blocks_count; | |
1958 | n_desc_blocks = o_desc_blocks + | |
1959 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
1960 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
aec51758 JL |
1961 | n_blocks_count = (ext4_fsblk_t)n_group * |
1962 | EXT4_BLOCKS_PER_GROUP(sb); | |
1c6bd717 | 1963 | n_group--; /* set to last group number */ |
01f795f9 | 1964 | } |
1c6bd717 TT |
1965 | |
1966 | if (!resize_inode) | |
1967 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
01f795f9 YY |
1968 | if (IS_ERR(resize_inode)) { |
1969 | ext4_warning(sb, "Error opening resize inode"); | |
1970 | return PTR_ERR(resize_inode); | |
1971 | } | |
1c6bd717 TT |
1972 | } |
1973 | ||
59e31c15 | 1974 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
1975 | err = ext4_convert_meta_bg(sb, resize_inode); |
1976 | if (err) | |
1977 | goto out; | |
1978 | if (resize_inode) { | |
1979 | iput(resize_inode); | |
1980 | resize_inode = NULL; | |
1981 | } | |
1982 | if (n_blocks_count_retry) { | |
1983 | n_blocks_count = n_blocks_count_retry; | |
1984 | n_blocks_count_retry = 0; | |
1985 | goto retry; | |
1986 | } | |
19c5246d YY |
1987 | } |
1988 | ||
a0ade1de LC |
1989 | /* extend the last group */ |
1990 | if (n_group == o_group) | |
1991 | add = n_blocks_count - o_blocks_count; | |
1992 | else | |
d77147ff | 1993 | add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); |
a0ade1de | 1994 | if (add > 0) { |
19c5246d YY |
1995 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1996 | if (err) | |
1997 | goto out; | |
1998 | } | |
1999 | ||
d7574ad0 | 2000 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
2001 | goto out; |
2002 | ||
117fff10 TT |
2003 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
2004 | if (err) | |
2005 | return err; | |
2006 | ||
28623c2f TT |
2007 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
2008 | if (err) | |
2009 | goto out; | |
2010 | ||
19c5246d YY |
2011 | flex_gd = alloc_flex_gd(flexbg_size); |
2012 | if (flex_gd == NULL) { | |
2013 | err = -ENOMEM; | |
2014 | goto out; | |
2015 | } | |
2016 | ||
2017 | /* Add flex groups. Note that a regular group is a | |
2018 | * flex group with 1 group. | |
2019 | */ | |
2020 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
2021 | flexbg_size)) { | |
4da4a56e TT |
2022 | if (jiffies - last_update_time > HZ * 10) { |
2023 | if (last_update_time) | |
2024 | ext4_msg(sb, KERN_INFO, | |
2025 | "resized to %llu blocks", | |
2026 | ext4_blocks_count(es)); | |
2027 | last_update_time = jiffies; | |
2028 | } | |
03c1c290 YY |
2029 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
2030 | break; | |
19c5246d YY |
2031 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
2032 | if (unlikely(err)) | |
2033 | break; | |
2034 | } | |
2035 | ||
1c6bd717 TT |
2036 | if (!err && n_blocks_count_retry) { |
2037 | n_blocks_count = n_blocks_count_retry; | |
2038 | n_blocks_count_retry = 0; | |
2039 | free_flex_gd(flex_gd); | |
2040 | flex_gd = NULL; | |
2041 | goto retry; | |
2042 | } | |
2043 | ||
19c5246d YY |
2044 | out: |
2045 | if (flex_gd) | |
2046 | free_flex_gd(flex_gd); | |
01f795f9 YY |
2047 | if (resize_inode != NULL) |
2048 | iput(resize_inode); | |
59e31c15 | 2049 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count); |
19c5246d YY |
2050 | return err; |
2051 | } |