]>
Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/resize.c |
ac27a0ec | 3 | * |
617ba13b | 4 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
5 | * |
6 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
7 | * | |
8 | * This could probably be made into a module, because it is not often in use. | |
9 | */ | |
10 | ||
11 | ||
617ba13b | 12 | #define EXT4FS_DEBUG |
ac27a0ec | 13 | |
ac27a0ec DK |
14 | #include <linux/errno.h> |
15 | #include <linux/slab.h> | |
16 | ||
3dcf5451 | 17 | #include "ext4_jbd2.h" |
ac27a0ec | 18 | |
8f82f840 YY |
19 | int ext4_resize_begin(struct super_block *sb) |
20 | { | |
21 | int ret = 0; | |
22 | ||
23 | if (!capable(CAP_SYS_RESOURCE)) | |
24 | return -EPERM; | |
25 | ||
ce723c31 YY |
26 | /* |
27 | * We are not allowed to do online-resizing on a filesystem mounted | |
28 | * with error, because it can destroy the filesystem easily. | |
29 | */ | |
30 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
31 | ext4_warning(sb, "There are errors in the filesystem, " | |
32 | "so online resizing is not allowed\n"); | |
33 | return -EPERM; | |
34 | } | |
35 | ||
8f82f840 YY |
36 | if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) |
37 | ret = -EBUSY; | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | void ext4_resize_end(struct super_block *sb) | |
43 | { | |
44 | clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags); | |
45 | smp_mb__after_clear_bit(); | |
46 | } | |
47 | ||
01f795f9 YY |
48 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
49 | ext4_group_t group) { | |
50 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
51 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
52 | } | |
53 | ||
54 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
55 | ext4_group_t group) { | |
56 | group = ext4_meta_bg_first_group(sb, group); | |
57 | return ext4_group_first_block_no(sb, group); | |
58 | } | |
59 | ||
60 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
61 | ext4_group_t group) { | |
62 | ext4_grpblk_t overhead; | |
63 | overhead = ext4_bg_num_gdb(sb, group); | |
64 | if (ext4_bg_has_super(sb, group)) | |
65 | overhead += 1 + | |
66 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
67 | return overhead; | |
68 | } | |
69 | ||
ac27a0ec DK |
70 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
71 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
72 | ||
73 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 74 | struct ext4_new_group_data *input) |
ac27a0ec | 75 | { |
617ba13b MC |
76 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
77 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 78 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 79 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 80 | ext4_group_t group = input->group; |
617ba13b | 81 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
01f795f9 | 82 | unsigned overhead = ext4_group_overhead_blocks(sb, group); |
617ba13b | 83 | ext4_fsblk_t metaend = start + overhead; |
ac27a0ec | 84 | struct buffer_head *bh = NULL; |
3a5b2ecd | 85 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
86 | int err = -EINVAL; |
87 | ||
88 | input->free_blocks_count = free_blocks_count = | |
89 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; | |
90 | ||
91 | if (test_opt(sb, DEBUG)) | |
617ba13b | 92 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 93 | "(%d free, %u reserved)\n", |
617ba13b | 94 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
95 | "no-super", input->group, input->blocks_count, |
96 | free_blocks_count, input->reserved_blocks); | |
97 | ||
3a5b2ecd | 98 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
ac27a0ec | 99 | if (group != sbi->s_groups_count) |
12062ddd | 100 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", |
ac27a0ec | 101 | input->group, sbi->s_groups_count); |
3a5b2ecd | 102 | else if (offset != 0) |
12062ddd | 103 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 104 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 105 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
106 | input->reserved_blocks); |
107 | else if (free_blocks_count < 0) | |
12062ddd | 108 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
109 | input->blocks_count); |
110 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 111 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
112 | end - 1); |
113 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 114 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 115 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 116 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 117 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 118 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 119 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 120 | outside(itend - 1, start, end)) |
12062ddd | 121 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 122 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 123 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 124 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 125 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 126 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
127 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
128 | "(%llu-%llu)", | |
1939e49a RD |
129 | (unsigned long long)input->block_bitmap, |
130 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 131 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
132 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
133 | "(%llu-%llu)", | |
1939e49a RD |
134 | (unsigned long long)input->inode_bitmap, |
135 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 136 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 137 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
138 | (unsigned long long)input->block_bitmap, |
139 | start, metaend - 1); | |
ac27a0ec | 140 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 141 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
142 | (unsigned long long)input->inode_bitmap, |
143 | start, metaend - 1); | |
ac27a0ec | 144 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 145 | inside(itend - 1, start, metaend)) |
12062ddd ES |
146 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
147 | "(%llu-%llu)", | |
1939e49a RD |
148 | (unsigned long long)input->inode_table, |
149 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
150 | else |
151 | err = 0; | |
152 | brelse(bh); | |
153 | ||
154 | return err; | |
155 | } | |
156 | ||
28c7bac0 YY |
157 | /* |
158 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
159 | * group each time. | |
160 | */ | |
161 | struct ext4_new_flex_group_data { | |
162 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
163 | in the flex group */ | |
164 | __u16 *bg_flags; /* block group flags of groups | |
165 | in @groups */ | |
166 | ext4_group_t count; /* number of groups in @groups | |
167 | */ | |
168 | }; | |
169 | ||
170 | /* | |
171 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
172 | * @flexbg_size. | |
173 | * | |
174 | * Returns NULL on failure otherwise address of the allocated structure. | |
175 | */ | |
176 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
177 | { | |
178 | struct ext4_new_flex_group_data *flex_gd; | |
179 | ||
180 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
181 | if (flex_gd == NULL) | |
182 | goto out3; | |
183 | ||
967ac8af HC |
184 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) |
185 | goto out2; | |
28c7bac0 YY |
186 | flex_gd->count = flexbg_size; |
187 | ||
188 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
189 | flexbg_size, GFP_NOFS); | |
190 | if (flex_gd->groups == NULL) | |
191 | goto out2; | |
192 | ||
193 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
194 | if (flex_gd->bg_flags == NULL) | |
195 | goto out1; | |
196 | ||
197 | return flex_gd; | |
198 | ||
199 | out1: | |
200 | kfree(flex_gd->groups); | |
201 | out2: | |
202 | kfree(flex_gd); | |
203 | out3: | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
208 | { | |
209 | kfree(flex_gd->bg_flags); | |
210 | kfree(flex_gd->groups); | |
211 | kfree(flex_gd); | |
212 | } | |
213 | ||
3fbea4b3 YY |
214 | /* |
215 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
216 | * and inode tables for a flex group. | |
217 | * | |
218 | * This function is used by 64bit-resize. Note that this function allocates | |
219 | * group tables from the 1st group of groups contained by @flexgd, which may | |
220 | * be a partial of a flex group. | |
221 | * | |
222 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
223 | * |
224 | * Returns 0 on a successful allocation of the metadata blocks in the | |
225 | * block group. | |
3fbea4b3 | 226 | */ |
03c1c290 | 227 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
228 | struct ext4_new_flex_group_data *flex_gd, |
229 | int flexbg_size) | |
230 | { | |
231 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
232 | ext4_fsblk_t start_blk; |
233 | ext4_fsblk_t last_blk; | |
234 | ext4_group_t src_group; | |
235 | ext4_group_t bb_index = 0; | |
236 | ext4_group_t ib_index = 0; | |
237 | ext4_group_t it_index = 0; | |
238 | ext4_group_t group; | |
239 | ext4_group_t last_group; | |
240 | unsigned overhead; | |
241 | ||
242 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
243 | ||
244 | src_group = group_data[0].group; | |
245 | last_group = src_group + flex_gd->count - 1; | |
246 | ||
247 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
248 | (last_group & ~(flexbg_size - 1)))); | |
249 | next_group: | |
250 | group = group_data[0].group; | |
03c1c290 YY |
251 | if (src_group >= group_data[0].group + flex_gd->count) |
252 | return -ENOSPC; | |
3fbea4b3 YY |
253 | start_blk = ext4_group_first_block_no(sb, src_group); |
254 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
255 | ||
01f795f9 | 256 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
257 | |
258 | start_blk += overhead; | |
259 | ||
3fbea4b3 YY |
260 | /* We collect contiguous blocks as much as possible. */ |
261 | src_group++; | |
01f795f9 YY |
262 | for (; src_group <= last_group; src_group++) { |
263 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
264 | if (overhead != 0) | |
3fbea4b3 YY |
265 | last_blk += group_data[src_group - group].blocks_count; |
266 | else | |
267 | break; | |
01f795f9 | 268 | } |
3fbea4b3 YY |
269 | |
270 | /* Allocate block bitmaps */ | |
271 | for (; bb_index < flex_gd->count; bb_index++) { | |
272 | if (start_blk >= last_blk) | |
273 | goto next_group; | |
274 | group_data[bb_index].block_bitmap = start_blk++; | |
275 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
276 | group -= group_data[0].group; | |
277 | group_data[group].free_blocks_count--; | |
278 | if (flexbg_size > 1) | |
279 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
280 | } | |
281 | ||
282 | /* Allocate inode bitmaps */ | |
283 | for (; ib_index < flex_gd->count; ib_index++) { | |
284 | if (start_blk >= last_blk) | |
285 | goto next_group; | |
286 | group_data[ib_index].inode_bitmap = start_blk++; | |
287 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
288 | group -= group_data[0].group; | |
289 | group_data[group].free_blocks_count--; | |
290 | if (flexbg_size > 1) | |
291 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
292 | } | |
293 | ||
294 | /* Allocate inode tables */ | |
295 | for (; it_index < flex_gd->count; it_index++) { | |
296 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) | |
297 | goto next_group; | |
298 | group_data[it_index].inode_table = start_blk; | |
299 | ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); | |
300 | group -= group_data[0].group; | |
301 | group_data[group].free_blocks_count -= | |
302 | EXT4_SB(sb)->s_itb_per_group; | |
303 | if (flexbg_size > 1) | |
304 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
305 | ||
306 | start_blk += EXT4_SB(sb)->s_itb_per_group; | |
307 | } | |
308 | ||
309 | if (test_opt(sb, DEBUG)) { | |
310 | int i; | |
311 | group = group_data[0].group; | |
312 | ||
313 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
314 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
315 | flexbg_size); | |
316 | ||
317 | for (i = 0; i < flex_gd->count; i++) { | |
318 | printk(KERN_DEBUG "adding %s group %u: %u " | |
319 | "blocks (%d free)\n", | |
320 | ext4_bg_has_super(sb, group + i) ? "normal" : | |
321 | "no-super", group + i, | |
322 | group_data[i].blocks_count, | |
323 | group_data[i].free_blocks_count); | |
324 | } | |
325 | } | |
03c1c290 | 326 | return 0; |
3fbea4b3 YY |
327 | } |
328 | ||
ac27a0ec | 329 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 330 | ext4_fsblk_t blk) |
ac27a0ec DK |
331 | { |
332 | struct buffer_head *bh; | |
333 | int err; | |
334 | ||
335 | bh = sb_getblk(sb, blk); | |
aebf0243 | 336 | if (unlikely(!bh)) |
860d21e2 | 337 | return ERR_PTR(-ENOMEM); |
617ba13b | 338 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
339 | brelse(bh); |
340 | bh = ERR_PTR(err); | |
341 | } else { | |
ac27a0ec DK |
342 | memset(bh->b_data, 0, sb->s_blocksize); |
343 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
344 | } |
345 | ||
346 | return bh; | |
347 | } | |
348 | ||
14904107 ES |
349 | /* |
350 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
351 | * If that fails, restart the transaction & regain write access for the | |
352 | * buffer head which is used for block_bitmap modifications. | |
353 | */ | |
6d40bc5a | 354 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
355 | { |
356 | int err; | |
357 | ||
0390131b | 358 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
359 | return 0; |
360 | ||
361 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
362 | if (err < 0) | |
363 | return err; | |
364 | if (err) { | |
6d40bc5a YY |
365 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
366 | if (err) | |
14904107 | 367 | return err; |
2b2d6d01 | 368 | } |
14904107 ES |
369 | |
370 | return 0; | |
371 | } | |
372 | ||
33afdcc5 YY |
373 | /* |
374 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
375 | * | |
376 | * Helper function for ext4_setup_new_group_blocks() which set . | |
377 | * | |
378 | * @sb: super block | |
379 | * @handle: journal handle | |
380 | * @flex_gd: flex group data | |
381 | */ | |
382 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
383 | struct ext4_new_flex_group_data *flex_gd, | |
384 | ext4_fsblk_t block, ext4_group_t count) | |
385 | { | |
386 | ext4_group_t count2; | |
387 | ||
388 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
389 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
390 | ext4_fsblk_t start; | |
391 | struct buffer_head *bh; | |
392 | ext4_group_t group; | |
393 | int err; | |
394 | ||
395 | ext4_get_group_no_and_offset(sb, block, &group, NULL); | |
396 | start = ext4_group_first_block_no(sb, group); | |
397 | group -= flex_gd->groups[0].group; | |
398 | ||
399 | count2 = sb->s_blocksize * 8 - (block - start); | |
400 | if (count2 > count) | |
401 | count2 = count; | |
402 | ||
403 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
404 | BUG_ON(flex_gd->count > 1); | |
405 | continue; | |
406 | } | |
407 | ||
408 | err = extend_or_restart_transaction(handle, 1); | |
409 | if (err) | |
410 | return err; | |
411 | ||
412 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 413 | if (unlikely(!bh)) |
860d21e2 | 414 | return -ENOMEM; |
33afdcc5 YY |
415 | |
416 | err = ext4_journal_get_write_access(handle, bh); | |
417 | if (err) | |
418 | return err; | |
419 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
420 | block - start, count2); | |
421 | ext4_set_bits(bh->b_data, block - start, count2); | |
422 | ||
423 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
424 | if (unlikely(err)) | |
425 | return err; | |
426 | brelse(bh); | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
434 | * This doesn't need to be part of the main transaction, since we are only | |
435 | * changing blocks outside the actual filesystem. We still do journaling to | |
436 | * ensure the recovery is correct in case of a failure just after resize. | |
437 | * If any part of this fails, we simply abort the resize. | |
438 | * | |
439 | * setup_new_flex_group_blocks handles a flex group as follow: | |
440 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
441 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
442 | * super block and GDT. | |
443 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
444 | * bitmap for blocks taken by group tables. | |
445 | */ | |
446 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
447 | struct ext4_new_flex_group_data *flex_gd) | |
448 | { | |
449 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
450 | ext4_fsblk_t start; | |
451 | ext4_fsblk_t block; | |
452 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
453 | struct ext4_super_block *es = sbi->s_es; | |
454 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
455 | __u16 *bg_flags = flex_gd->bg_flags; | |
456 | handle_t *handle; | |
457 | ext4_group_t group, count; | |
458 | struct buffer_head *bh = NULL; | |
459 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 460 | int meta_bg; |
33afdcc5 YY |
461 | |
462 | BUG_ON(!flex_gd->count || !group_data || | |
463 | group_data[0].group != sbi->s_groups_count); | |
464 | ||
465 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
01f795f9 | 466 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
33afdcc5 YY |
467 | |
468 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 469 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
470 | if (IS_ERR(handle)) |
471 | return PTR_ERR(handle); | |
472 | ||
473 | group = group_data[0].group; | |
474 | for (i = 0; i < flex_gd->count; i++, group++) { | |
475 | unsigned long gdblocks; | |
01f795f9 | 476 | ext4_grpblk_t overhead; |
33afdcc5 YY |
477 | |
478 | gdblocks = ext4_bg_num_gdb(sb, group); | |
479 | start = ext4_group_first_block_no(sb, group); | |
480 | ||
01f795f9 | 481 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
482 | goto handle_itb; |
483 | ||
01f795f9 YY |
484 | if (meta_bg == 1) { |
485 | ext4_group_t first_group; | |
486 | first_group = ext4_meta_bg_first_group(sb, group); | |
487 | if (first_group != group + 1 && | |
488 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
489 | goto handle_itb; | |
490 | } | |
491 | ||
492 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 493 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 494 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
495 | struct buffer_head *gdb; |
496 | ||
497 | ext4_debug("update backup group %#04llx\n", block); | |
498 | err = extend_or_restart_transaction(handle, 1); | |
499 | if (err) | |
500 | goto out; | |
501 | ||
502 | gdb = sb_getblk(sb, block); | |
aebf0243 | 503 | if (unlikely(!gdb)) { |
860d21e2 | 504 | err = -ENOMEM; |
33afdcc5 YY |
505 | goto out; |
506 | } | |
507 | ||
508 | err = ext4_journal_get_write_access(handle, gdb); | |
509 | if (err) { | |
510 | brelse(gdb); | |
511 | goto out; | |
512 | } | |
513 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
514 | gdb->b_size); | |
515 | set_buffer_uptodate(gdb); | |
516 | ||
517 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
518 | if (unlikely(err)) { | |
519 | brelse(gdb); | |
520 | goto out; | |
521 | } | |
522 | brelse(gdb); | |
523 | } | |
524 | ||
525 | /* Zero out all of the reserved backup group descriptor | |
526 | * table blocks | |
527 | */ | |
528 | if (ext4_bg_has_super(sb, group)) { | |
529 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
530 | reserved_gdb, GFP_NOFS); | |
531 | if (err) | |
532 | goto out; | |
533 | } | |
534 | ||
6df935ad | 535 | handle_itb: |
33afdcc5 YY |
536 | /* Initialize group tables of the grop @group */ |
537 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
538 | goto handle_bb; | |
539 | ||
540 | /* Zero out all of the inode table blocks */ | |
541 | block = group_data[i].inode_table; | |
542 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
543 | block, sbi->s_itb_per_group); | |
544 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
545 | GFP_NOFS); | |
546 | if (err) | |
547 | goto out; | |
548 | ||
549 | handle_bb: | |
550 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
551 | goto handle_ib; | |
552 | ||
553 | /* Initialize block bitmap of the @group */ | |
554 | block = group_data[i].block_bitmap; | |
555 | err = extend_or_restart_transaction(handle, 1); | |
556 | if (err) | |
557 | goto out; | |
558 | ||
559 | bh = bclean(handle, sb, block); | |
560 | if (IS_ERR(bh)) { | |
561 | err = PTR_ERR(bh); | |
562 | goto out; | |
563 | } | |
01f795f9 YY |
564 | overhead = ext4_group_overhead_blocks(sb, group); |
565 | if (overhead != 0) { | |
33afdcc5 YY |
566 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
567 | start); | |
01f795f9 | 568 | ext4_set_bits(bh->b_data, 0, overhead); |
33afdcc5 YY |
569 | } |
570 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
571 | sb->s_blocksize * 8, bh->b_data); | |
572 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
573 | if (err) | |
574 | goto out; | |
575 | brelse(bh); | |
576 | ||
577 | handle_ib: | |
578 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
579 | continue; | |
580 | ||
581 | /* Initialize inode bitmap of the @group */ | |
582 | block = group_data[i].inode_bitmap; | |
583 | err = extend_or_restart_transaction(handle, 1); | |
584 | if (err) | |
585 | goto out; | |
586 | /* Mark unused entries in inode bitmap used */ | |
587 | bh = bclean(handle, sb, block); | |
588 | if (IS_ERR(bh)) { | |
589 | err = PTR_ERR(bh); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
594 | sb->s_blocksize * 8, bh->b_data); | |
595 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
596 | if (err) | |
597 | goto out; | |
598 | brelse(bh); | |
599 | } | |
600 | bh = NULL; | |
601 | ||
602 | /* Mark group tables in block bitmap */ | |
603 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
604 | count = group_table_count[j]; | |
605 | start = (&group_data[0].block_bitmap)[j]; | |
606 | block = start; | |
607 | for (i = 1; i < flex_gd->count; i++) { | |
608 | block += group_table_count[j]; | |
609 | if (block == (&group_data[i].block_bitmap)[j]) { | |
610 | count += group_table_count[j]; | |
611 | continue; | |
612 | } | |
613 | err = set_flexbg_block_bitmap(sb, handle, | |
614 | flex_gd, start, count); | |
615 | if (err) | |
616 | goto out; | |
617 | count = group_table_count[j]; | |
618 | start = group_data[i].block_bitmap; | |
619 | block = start; | |
620 | } | |
621 | ||
622 | if (count) { | |
623 | err = set_flexbg_block_bitmap(sb, handle, | |
624 | flex_gd, start, count); | |
625 | if (err) | |
626 | goto out; | |
627 | } | |
628 | } | |
629 | ||
630 | out: | |
631 | brelse(bh); | |
632 | err2 = ext4_journal_stop(handle); | |
633 | if (err2 && !err) | |
634 | err = err2; | |
635 | ||
636 | return err; | |
637 | } | |
638 | ||
ac27a0ec DK |
639 | /* |
640 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 641 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
642 | * calling this for the first time. In a sparse filesystem it will be the |
643 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
644 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
645 | */ | |
617ba13b | 646 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
647 | unsigned *five, unsigned *seven) |
648 | { | |
649 | unsigned *min = three; | |
650 | int mult = 3; | |
651 | unsigned ret; | |
652 | ||
617ba13b MC |
653 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
654 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
655 | ret = *min; |
656 | *min += 1; | |
657 | return ret; | |
658 | } | |
659 | ||
660 | if (*five < *min) { | |
661 | min = five; | |
662 | mult = 5; | |
663 | } | |
664 | if (*seven < *min) { | |
665 | min = seven; | |
666 | mult = 7; | |
667 | } | |
668 | ||
669 | ret = *min; | |
670 | *min *= mult; | |
671 | ||
672 | return ret; | |
673 | } | |
674 | ||
675 | /* | |
676 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
677 | * It is assumed that they are stored in group order. Returns the number of | |
678 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
679 | */ | |
680 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 681 | ext4_group_t end, |
ac27a0ec DK |
682 | struct buffer_head *primary) |
683 | { | |
617ba13b | 684 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
685 | unsigned three = 1; |
686 | unsigned five = 5; | |
687 | unsigned seven = 7; | |
688 | unsigned grp; | |
689 | __le32 *p = (__le32 *)primary->b_data; | |
690 | int gdbackups = 0; | |
691 | ||
617ba13b | 692 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
693 | if (le32_to_cpu(*p++) != |
694 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 695 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 696 | " missing grp %d (%llu)", |
ac27a0ec | 697 | blk, grp, |
bd81d8ee LV |
698 | grp * |
699 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
700 | blk); | |
ac27a0ec DK |
701 | return -EINVAL; |
702 | } | |
617ba13b | 703 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
704 | return -EFBIG; |
705 | } | |
706 | ||
707 | return gdbackups; | |
708 | } | |
709 | ||
710 | /* | |
711 | * Called when we need to bring a reserved group descriptor table block into | |
712 | * use from the resize inode. The primary copy of the new GDT block currently | |
713 | * is an indirect block (under the double indirect block in the resize inode). | |
714 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
715 | * block, in group order. Even though we know all the block numbers we need, | |
716 | * we check to ensure that the resize inode has actually reserved these blocks. | |
717 | * | |
718 | * Don't need to update the block bitmaps because the blocks are still in use. | |
719 | * | |
720 | * We get all of the error cases out of the way, so that we are sure to not | |
721 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
722 | */ | |
723 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 724 | ext4_group_t group) |
ac27a0ec DK |
725 | { |
726 | struct super_block *sb = inode->i_sb; | |
617ba13b | 727 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 728 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 729 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
730 | struct buffer_head **o_group_desc, **n_group_desc; |
731 | struct buffer_head *dind; | |
2f919710 | 732 | struct buffer_head *gdb_bh; |
ac27a0ec | 733 | int gdbackups; |
617ba13b | 734 | struct ext4_iloc iloc; |
ac27a0ec DK |
735 | __le32 *data; |
736 | int err; | |
737 | ||
738 | if (test_opt(sb, DEBUG)) | |
739 | printk(KERN_DEBUG | |
617ba13b | 740 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
741 | gdb_num); |
742 | ||
af5bc92d TT |
743 | /* |
744 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
745 | * because the user tools have no way of handling this. Probably a |
746 | * bad time to do it anyways. | |
747 | */ | |
617ba13b MC |
748 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
749 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 750 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 751 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
752 | return -EPERM; |
753 | } | |
754 | ||
2f919710 YY |
755 | gdb_bh = sb_bread(sb, gdblock); |
756 | if (!gdb_bh) | |
ac27a0ec DK |
757 | return -EIO; |
758 | ||
c72df9f9 | 759 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 760 | if (gdbackups < 0) { |
ac27a0ec DK |
761 | err = gdbackups; |
762 | goto exit_bh; | |
763 | } | |
764 | ||
617ba13b | 765 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
766 | dind = sb_bread(sb, le32_to_cpu(*data)); |
767 | if (!dind) { | |
768 | err = -EIO; | |
769 | goto exit_bh; | |
770 | } | |
771 | ||
772 | data = (__le32 *)dind->b_data; | |
617ba13b | 773 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 774 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 775 | group, gdblock); |
ac27a0ec DK |
776 | err = -EINVAL; |
777 | goto exit_dind; | |
778 | } | |
779 | ||
b4097142 TT |
780 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
781 | if (unlikely(err)) | |
ac27a0ec DK |
782 | goto exit_dind; |
783 | ||
2f919710 | 784 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 785 | if (unlikely(err)) |
37be2f59 | 786 | goto exit_dind; |
ac27a0ec | 787 | |
b4097142 TT |
788 | err = ext4_journal_get_write_access(handle, dind); |
789 | if (unlikely(err)) | |
790 | ext4_std_error(sb, err); | |
ac27a0ec | 791 | |
617ba13b | 792 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
793 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
794 | if (unlikely(err)) | |
37be2f59 | 795 | goto exit_dind; |
ac27a0ec | 796 | |
f18a5f21 TT |
797 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
798 | sizeof(struct buffer_head *), | |
799 | GFP_NOFS); | |
ac27a0ec DK |
800 | if (!n_group_desc) { |
801 | err = -ENOMEM; | |
f18a5f21 TT |
802 | ext4_warning(sb, "not enough memory for %lu groups", |
803 | gdb_num + 1); | |
ac27a0ec DK |
804 | goto exit_inode; |
805 | } | |
806 | ||
807 | /* | |
808 | * Finally, we have all of the possible failures behind us... | |
809 | * | |
810 | * Remove new GDT block from inode double-indirect block and clear out | |
811 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
812 | * from the reserved inode). We don't need to change the bitmaps for | |
813 | * these blocks, because they are marked as in-use from being in the | |
814 | * reserved inode, and will become GDT blocks (primary and backup). | |
815 | */ | |
617ba13b | 816 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
817 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
818 | if (unlikely(err)) { | |
819 | ext4_std_error(sb, err); | |
820 | goto exit_inode; | |
821 | } | |
ac27a0ec | 822 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 823 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
824 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
825 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
826 | if (unlikely(err)) { |
827 | ext4_std_error(sb, err); | |
828 | goto exit_inode; | |
829 | } | |
830 | brelse(dind); | |
ac27a0ec | 831 | |
617ba13b | 832 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 833 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 834 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 835 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
836 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
837 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 838 | ext4_kvfree(o_group_desc); |
ac27a0ec | 839 | |
e8546d06 | 840 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 841 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
842 | if (err) |
843 | ext4_std_error(sb, err); | |
ac27a0ec | 844 | |
b4097142 | 845 | return err; |
ac27a0ec DK |
846 | |
847 | exit_inode: | |
f18a5f21 | 848 | ext4_kvfree(n_group_desc); |
ac27a0ec | 849 | brelse(iloc.bh); |
ac27a0ec DK |
850 | exit_dind: |
851 | brelse(dind); | |
852 | exit_bh: | |
2f919710 | 853 | brelse(gdb_bh); |
ac27a0ec | 854 | |
617ba13b | 855 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
856 | return err; |
857 | } | |
858 | ||
01f795f9 YY |
859 | /* |
860 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
861 | */ | |
862 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
863 | handle_t *handle, ext4_group_t group) { | |
864 | ext4_fsblk_t gdblock; | |
865 | struct buffer_head *gdb_bh; | |
866 | struct buffer_head **o_group_desc, **n_group_desc; | |
867 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
868 | int err; | |
869 | ||
870 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
871 | ext4_bg_has_super(sb, group); | |
872 | gdb_bh = sb_bread(sb, gdblock); | |
873 | if (!gdb_bh) | |
874 | return -EIO; | |
875 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * | |
876 | sizeof(struct buffer_head *), | |
877 | GFP_NOFS); | |
878 | if (!n_group_desc) { | |
879 | err = -ENOMEM; | |
880 | ext4_warning(sb, "not enough memory for %lu groups", | |
881 | gdb_num + 1); | |
882 | return err; | |
883 | } | |
884 | ||
885 | o_group_desc = EXT4_SB(sb)->s_group_desc; | |
886 | memcpy(n_group_desc, o_group_desc, | |
887 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
888 | n_group_desc[gdb_num] = gdb_bh; | |
889 | EXT4_SB(sb)->s_group_desc = n_group_desc; | |
890 | EXT4_SB(sb)->s_gdb_count++; | |
891 | ext4_kvfree(o_group_desc); | |
892 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
893 | if (unlikely(err)) | |
894 | brelse(gdb_bh); | |
895 | return err; | |
896 | } | |
897 | ||
ac27a0ec DK |
898 | /* |
899 | * Called when we are adding a new group which has a backup copy of each of | |
900 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
901 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
902 | * that they are kept for future resizing and not allocated to files. | |
903 | * | |
904 | * Each reserved backup GDT block will go into a different indirect block. | |
905 | * The indirect blocks are actually the primary reserved GDT blocks, | |
906 | * so we know in advance what their block numbers are. We only get the | |
907 | * double-indirect block to verify it is pointing to the primary reserved | |
908 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
909 | * backup GDT blocks are stored in their reserved primary GDT block. | |
910 | */ | |
911 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 912 | ext4_group_t group) |
ac27a0ec DK |
913 | { |
914 | struct super_block *sb = inode->i_sb; | |
617ba13b | 915 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
916 | struct buffer_head **primary; |
917 | struct buffer_head *dind; | |
617ba13b MC |
918 | struct ext4_iloc iloc; |
919 | ext4_fsblk_t blk; | |
ac27a0ec DK |
920 | __le32 *data, *end; |
921 | int gdbackups = 0; | |
922 | int res, i; | |
923 | int err; | |
924 | ||
216553c4 | 925 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
926 | if (!primary) |
927 | return -ENOMEM; | |
928 | ||
617ba13b | 929 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
930 | dind = sb_bread(sb, le32_to_cpu(*data)); |
931 | if (!dind) { | |
932 | err = -EIO; | |
933 | goto exit_free; | |
934 | } | |
935 | ||
617ba13b | 936 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
937 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
938 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 939 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
940 | |
941 | /* Get each reserved primary GDT block and verify it holds backups */ | |
942 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
943 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 944 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
945 | " not at offset %ld", |
946 | blk, | |
947 | (long)(data - (__le32 *)dind->b_data)); | |
948 | err = -EINVAL; | |
949 | goto exit_bh; | |
950 | } | |
951 | primary[res] = sb_bread(sb, blk); | |
952 | if (!primary[res]) { | |
953 | err = -EIO; | |
954 | goto exit_bh; | |
955 | } | |
c72df9f9 YY |
956 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
957 | if (gdbackups < 0) { | |
ac27a0ec DK |
958 | brelse(primary[res]); |
959 | err = gdbackups; | |
960 | goto exit_bh; | |
961 | } | |
962 | if (++data >= end) | |
963 | data = (__le32 *)dind->b_data; | |
964 | } | |
965 | ||
966 | for (i = 0; i < reserved_gdb; i++) { | |
37be2f59 | 967 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 968 | goto exit_bh; |
ac27a0ec DK |
969 | } |
970 | ||
617ba13b | 971 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
972 | goto exit_bh; |
973 | ||
974 | /* | |
975 | * Finally we can add each of the reserved backup GDT blocks from | |
976 | * the new group to its reserved primary GDT block. | |
977 | */ | |
668f4dc5 | 978 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
979 | for (i = 0; i < reserved_gdb; i++) { |
980 | int err2; | |
981 | data = (__le32 *)primary[i]->b_data; | |
982 | /* printk("reserving backup %lu[%u] = %lu\n", | |
983 | primary[i]->b_blocknr, gdbackups, | |
984 | blk + primary[i]->b_blocknr); */ | |
985 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 986 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
987 | if (!err) |
988 | err = err2; | |
989 | } | |
990 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 991 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
992 | |
993 | exit_bh: | |
994 | while (--res >= 0) | |
995 | brelse(primary[res]); | |
996 | brelse(dind); | |
997 | ||
998 | exit_free: | |
999 | kfree(primary); | |
1000 | ||
1001 | return err; | |
1002 | } | |
1003 | ||
1004 | /* | |
617ba13b | 1005 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1006 | * of the main resize transaction, because e2fsck will re-write them if there |
1007 | * is a problem (basically only OOM will cause a problem). However, we | |
1008 | * _should_ update the backups if possible, in case the primary gets trashed | |
1009 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1010 | * important part is that the new block and inode counts are in the backup | |
1011 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1012 | * | |
32ed5058 TT |
1013 | * We do not need take the s_resize_lock for this, because these |
1014 | * blocks are not otherwise touched by the filesystem code when it is | |
1015 | * mounted. We don't need to worry about last changing from | |
1016 | * sbi->s_groups_count, because the worst that can happen is that we | |
1017 | * do not copy the full number of backups at this time. The resize | |
1018 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1019 | */ |
01f795f9 YY |
1020 | static void update_backups(struct super_block *sb, int blk_off, char *data, |
1021 | int size, int meta_bg) | |
ac27a0ec | 1022 | { |
617ba13b | 1023 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1024 | ext4_group_t last; |
617ba13b | 1025 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1026 | unsigned three = 1; |
1027 | unsigned five = 5; | |
1028 | unsigned seven = 7; | |
01f795f9 | 1029 | ext4_group_t group = 0; |
ac27a0ec DK |
1030 | int rest = sb->s_blocksize - size; |
1031 | handle_t *handle; | |
1032 | int err = 0, err2; | |
1033 | ||
9924a92a | 1034 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1035 | if (IS_ERR(handle)) { |
1036 | group = 1; | |
1037 | err = PTR_ERR(handle); | |
1038 | goto exit_err; | |
1039 | } | |
1040 | ||
01f795f9 YY |
1041 | if (meta_bg == 0) { |
1042 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1043 | last = sbi->s_groups_count; | |
1044 | } else { | |
1045 | group = ext4_meta_bg_first_group(sb, group) + 1; | |
1046 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); | |
1047 | } | |
1048 | ||
1049 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1050 | struct buffer_head *bh; |
01f795f9 | 1051 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1052 | |
1053 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1054 | if (ext4_handle_valid(handle) && |
1055 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1056 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1057 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1058 | break; |
1059 | ||
01f795f9 YY |
1060 | if (meta_bg == 0) |
1061 | backup_block = group * bpg + blk_off; | |
1062 | else | |
1063 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1064 | ext4_bg_has_super(sb, group)); | |
1065 | ||
1066 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1067 | if (unlikely(!bh)) { |
860d21e2 | 1068 | err = -ENOMEM; |
ac27a0ec DK |
1069 | break; |
1070 | } | |
01f795f9 YY |
1071 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1072 | backup_block, backup_block - | |
1073 | ext4_group_first_block_no(sb, group)); | |
617ba13b | 1074 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1075 | break; |
1076 | lock_buffer(bh); | |
1077 | memcpy(bh->b_data, data, size); | |
1078 | if (rest) | |
1079 | memset(bh->b_data + size, 0, rest); | |
1080 | set_buffer_uptodate(bh); | |
1081 | unlock_buffer(bh); | |
b4097142 TT |
1082 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1083 | if (unlikely(err)) | |
1084 | ext4_std_error(sb, err); | |
ac27a0ec | 1085 | brelse(bh); |
01f795f9 YY |
1086 | |
1087 | if (meta_bg == 0) | |
1088 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1089 | else if (group == last) | |
1090 | break; | |
1091 | else | |
1092 | group = last; | |
ac27a0ec | 1093 | } |
617ba13b | 1094 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1095 | err = err2; |
1096 | ||
1097 | /* | |
1098 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1099 | * late to revert the resize, we shouldn't fail just because of | |
1100 | * the backup copies (they are only needed in case of corruption). | |
1101 | * | |
1102 | * However, if we got here we have a journal problem too, so we | |
1103 | * can't really start a transaction to mark the superblock. | |
1104 | * Chicken out and just set the flag on the hope it will be written | |
1105 | * to disk, and if not - we will simply wait until next fsck. | |
1106 | */ | |
1107 | exit_err: | |
1108 | if (err) { | |
12062ddd | 1109 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1110 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1111 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1112 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1113 | mark_buffer_dirty(sbi->s_sbh); |
1114 | } | |
1115 | } | |
1116 | ||
bb08c1e7 YY |
1117 | /* |
1118 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1119 | * starting at @group | |
1120 | * | |
1121 | * @handle: journal handle | |
1122 | * @sb: super block | |
1123 | * @group: the group no. of the first group desc to be added | |
1124 | * @resize_inode: the resize inode | |
1125 | * @count: number of group descriptors to be added | |
1126 | */ | |
1127 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1128 | ext4_group_t group, struct inode *resize_inode, | |
1129 | ext4_group_t count) | |
1130 | { | |
1131 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1132 | struct ext4_super_block *es = sbi->s_es; | |
1133 | struct buffer_head *gdb_bh; | |
1134 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1135 | int meta_bg; |
bb08c1e7 | 1136 | |
01f795f9 | 1137 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
bb08c1e7 YY |
1138 | for (i = 0; i < count; i++, group++) { |
1139 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1140 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1141 | ||
1142 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1143 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1144 | ||
1145 | /* | |
1146 | * We will only either add reserved group blocks to a backup group | |
1147 | * or remove reserved blocks for the first group in a new group block. | |
1148 | * Doing both would be mean more complex code, and sane people don't | |
1149 | * use non-sparse filesystems anymore. This is already checked above. | |
1150 | */ | |
1151 | if (gdb_off) { | |
1152 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1153 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1154 | ||
1155 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1156 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1157 | } else if (meta_bg != 0) { |
1158 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1159 | } else { | |
bb08c1e7 | 1160 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1161 | } |
bb08c1e7 YY |
1162 | if (err) |
1163 | break; | |
1164 | } | |
1165 | return err; | |
1166 | } | |
1167 | ||
41a246d1 DW |
1168 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1169 | { | |
1170 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1171 | if (unlikely(!bh)) |
41a246d1 | 1172 | return NULL; |
7f1468d1 DM |
1173 | if (!bh_uptodate_or_lock(bh)) { |
1174 | if (bh_submit_read(bh) < 0) { | |
1175 | brelse(bh); | |
1176 | return NULL; | |
1177 | } | |
41a246d1 | 1178 | } |
41a246d1 DW |
1179 | |
1180 | return bh; | |
1181 | } | |
1182 | ||
1183 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1184 | ext4_group_t group, | |
1185 | struct ext4_group_desc *gdp, | |
1186 | struct ext4_new_group_data *group_data) | |
1187 | { | |
1188 | struct buffer_head *bh; | |
1189 | ||
1190 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1191 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
1192 | return 0; | |
1193 | ||
1194 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1195 | if (!bh) | |
1196 | return -EIO; | |
1197 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1198 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1199 | brelse(bh); | |
1200 | ||
fa77dcfa DW |
1201 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1202 | if (!bh) | |
1203 | return -EIO; | |
79f1ba49 | 1204 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1205 | brelse(bh); |
1206 | ||
41a246d1 DW |
1207 | return 0; |
1208 | } | |
1209 | ||
083f5b24 YY |
1210 | /* |
1211 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1212 | */ | |
1213 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1214 | struct ext4_new_flex_group_data *flex_gd) | |
1215 | { | |
1216 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1217 | struct ext4_group_desc *gdp; | |
1218 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1219 | struct buffer_head *gdb_bh; | |
1220 | ext4_group_t group; | |
1221 | __u16 *bg_flags = flex_gd->bg_flags; | |
1222 | int i, gdb_off, gdb_num, err = 0; | |
1223 | ||
1224 | ||
1225 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1226 | group = group_data->group; | |
1227 | ||
1228 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1229 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1230 | ||
1231 | /* | |
1232 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1233 | */ | |
1234 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1235 | /* Update group descriptor block for new group */ | |
2716b802 | 1236 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1237 | gdb_off * EXT4_DESC_SIZE(sb)); |
1238 | ||
1239 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1240 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1241 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1242 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1243 | if (err) { | |
1244 | ext4_std_error(sb, err); | |
1245 | break; | |
1246 | } | |
1247 | ||
083f5b24 YY |
1248 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1249 | ext4_free_group_clusters_set(sb, gdp, | |
810da240 | 1250 | EXT4_NUM_B2C(sbi, group_data->free_blocks_count)); |
083f5b24 | 1251 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1252 | if (ext4_has_group_desc_csum(sb)) |
1253 | ext4_itable_unused_set(sb, gdp, | |
1254 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1255 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1256 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1257 | |
1258 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1259 | if (unlikely(err)) { | |
1260 | ext4_std_error(sb, err); | |
1261 | break; | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * We can allocate memory for mb_alloc based on the new group | |
1266 | * descriptor | |
1267 | */ | |
1268 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1269 | if (err) | |
1270 | break; | |
1271 | } | |
1272 | return err; | |
1273 | } | |
1274 | ||
2e10e2f2 YY |
1275 | /* |
1276 | * ext4_update_super() updates the super block so that the newly added | |
1277 | * groups can be seen by the filesystem. | |
1278 | * | |
1279 | * @sb: super block | |
1280 | * @flex_gd: new added groups | |
1281 | */ | |
1282 | static void ext4_update_super(struct super_block *sb, | |
1283 | struct ext4_new_flex_group_data *flex_gd) | |
1284 | { | |
1285 | ext4_fsblk_t blocks_count = 0; | |
1286 | ext4_fsblk_t free_blocks = 0; | |
1287 | ext4_fsblk_t reserved_blocks = 0; | |
1288 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1289 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1290 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1291 | int i; |
2e10e2f2 YY |
1292 | |
1293 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1294 | /* | |
1295 | * Make the new blocks and inodes valid next. We do this before | |
1296 | * increasing the group count so that once the group is enabled, | |
1297 | * all of its blocks and inodes are already valid. | |
1298 | * | |
1299 | * We always allocate group-by-group, then block-by-block or | |
1300 | * inode-by-inode within a group, so enabling these | |
1301 | * blocks/inodes before the group is live won't actually let us | |
1302 | * allocate the new space yet. | |
1303 | */ | |
1304 | for (i = 0; i < flex_gd->count; i++) { | |
1305 | blocks_count += group_data[i].blocks_count; | |
1306 | free_blocks += group_data[i].free_blocks_count; | |
1307 | } | |
1308 | ||
1309 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1310 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1311 | reserved_blocks *= blocks_count; |
1312 | do_div(reserved_blocks, 100); | |
1313 | ||
1314 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1315 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1316 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1317 | flex_gd->count); | |
636d7e2e DW |
1318 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1319 | flex_gd->count); | |
2e10e2f2 | 1320 | |
01f795f9 | 1321 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1322 | /* |
1323 | * We need to protect s_groups_count against other CPUs seeing | |
1324 | * inconsistent state in the superblock. | |
1325 | * | |
1326 | * The precise rules we use are: | |
1327 | * | |
1328 | * * Writers must perform a smp_wmb() after updating all | |
1329 | * dependent data and before modifying the groups count | |
1330 | * | |
1331 | * * Readers must perform an smp_rmb() after reading the groups | |
1332 | * count and before reading any dependent data. | |
1333 | * | |
1334 | * NB. These rules can be relaxed when checking the group count | |
1335 | * while freeing data, as we can only allocate from a block | |
1336 | * group after serialising against the group count, and we can | |
1337 | * only then free after serialising in turn against that | |
1338 | * allocation. | |
1339 | */ | |
1340 | smp_wmb(); | |
1341 | ||
1342 | /* Update the global fs size fields */ | |
1343 | sbi->s_groups_count += flex_gd->count; | |
1344 | ||
1345 | /* Update the reserved block counts only once the new group is | |
1346 | * active. */ | |
1347 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1348 | reserved_blocks); | |
1349 | ||
1350 | /* Update the free space counts */ | |
1351 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1352 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1353 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1354 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1355 | ||
01f795f9 YY |
1356 | ext4_debug("free blocks count %llu", |
1357 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
2e10e2f2 YY |
1358 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, |
1359 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1360 | sbi->s_log_groups_per_flex) { | |
1361 | ext4_group_t flex_group; | |
1362 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
90ba983f TT |
1363 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
1364 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2e10e2f2 YY |
1365 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
1366 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1367 | } | |
1368 | ||
952fc18e TT |
1369 | /* |
1370 | * Update the fs overhead information | |
1371 | */ | |
1372 | ext4_calculate_overhead(sb); | |
1373 | ||
2e10e2f2 YY |
1374 | if (test_opt(sb, DEBUG)) |
1375 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1376 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1377 | blocks_count, free_blocks, reserved_blocks); | |
1378 | } | |
1379 | ||
4bac1f8c YY |
1380 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1381 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1382 | * transaction and not have it write the data to disk. | |
1383 | */ | |
1384 | static int ext4_flex_group_add(struct super_block *sb, | |
1385 | struct inode *resize_inode, | |
1386 | struct ext4_new_flex_group_data *flex_gd) | |
1387 | { | |
1388 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1389 | struct ext4_super_block *es = sbi->s_es; | |
1390 | ext4_fsblk_t o_blocks_count; | |
1391 | ext4_grpblk_t last; | |
1392 | ext4_group_t group; | |
1393 | handle_t *handle; | |
1394 | unsigned reserved_gdb; | |
1395 | int err = 0, err2 = 0, credit; | |
1396 | ||
1397 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1398 | ||
1399 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1400 | o_blocks_count = ext4_blocks_count(es); | |
1401 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1402 | BUG_ON(last); | |
1403 | ||
1404 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1405 | if (err) | |
1406 | goto exit; | |
1407 | /* | |
1408 | * We will always be modifying at least the superblock and GDT | |
1409 | * block. If we are adding a group past the last current GDT block, | |
1410 | * we will also modify the inode and the dindirect block. If we | |
1411 | * are adding a group with superblock/GDT backups we will also | |
1412 | * modify each of the reserved GDT dindirect blocks. | |
1413 | */ | |
1414 | credit = flex_gd->count * 4 + reserved_gdb; | |
9924a92a | 1415 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1416 | if (IS_ERR(handle)) { |
1417 | err = PTR_ERR(handle); | |
1418 | goto exit; | |
1419 | } | |
1420 | ||
1421 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1422 | if (err) | |
1423 | goto exit_journal; | |
1424 | ||
1425 | group = flex_gd->groups[0].group; | |
1426 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); | |
1427 | err = ext4_add_new_descs(handle, sb, group, | |
1428 | resize_inode, flex_gd->count); | |
1429 | if (err) | |
1430 | goto exit_journal; | |
1431 | ||
1432 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1433 | if (err) | |
1434 | goto exit_journal; | |
1435 | ||
1436 | ext4_update_super(sb, flex_gd); | |
1437 | ||
1438 | err = ext4_handle_dirty_super(handle, sb); | |
1439 | ||
1440 | exit_journal: | |
1441 | err2 = ext4_journal_stop(handle); | |
1442 | if (!err) | |
1443 | err = err2; | |
1444 | ||
1445 | if (!err) { | |
2ebd1704 YY |
1446 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1447 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1448 | EXT4_DESC_PER_BLOCK(sb)); | |
01f795f9 YY |
1449 | int meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, |
1450 | EXT4_FEATURE_INCOMPAT_META_BG); | |
0acdb887 | 1451 | sector_t old_gdb = 0; |
2ebd1704 | 1452 | |
4bac1f8c | 1453 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1454 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1455 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1456 | struct buffer_head *gdb_bh; |
2ebd1704 | 1457 | |
4bac1f8c | 1458 | gdb_bh = sbi->s_group_desc[gdb_num]; |
0acdb887 TM |
1459 | if (old_gdb == gdb_bh->b_blocknr) |
1460 | continue; | |
4bac1f8c | 1461 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1462 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1463 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1464 | } |
1465 | } | |
1466 | exit: | |
1467 | return err; | |
1468 | } | |
1469 | ||
19c5246d YY |
1470 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1471 | struct ext4_new_flex_group_data *flex_gd, | |
1472 | ext4_fsblk_t n_blocks_count, | |
1473 | unsigned long flexbg_size) | |
1474 | { | |
1475 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1476 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1477 | ext4_fsblk_t o_blocks_count; | |
1478 | ext4_group_t n_group; | |
1479 | ext4_group_t group; | |
1480 | ext4_group_t last_group; | |
1481 | ext4_grpblk_t last; | |
1482 | ext4_grpblk_t blocks_per_group; | |
1483 | unsigned long i; | |
1484 | ||
1485 | blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); | |
1486 | ||
1487 | o_blocks_count = ext4_blocks_count(es); | |
1488 | ||
1489 | if (o_blocks_count == n_blocks_count) | |
1490 | return 0; | |
1491 | ||
1492 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1493 | BUG_ON(last); | |
1494 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1495 | ||
1496 | last_group = group | (flexbg_size - 1); | |
1497 | if (last_group > n_group) | |
1498 | last_group = n_group; | |
1499 | ||
1500 | flex_gd->count = last_group - group + 1; | |
1501 | ||
1502 | for (i = 0; i < flex_gd->count; i++) { | |
1503 | int overhead; | |
1504 | ||
1505 | group_data[i].group = group + i; | |
1506 | group_data[i].blocks_count = blocks_per_group; | |
01f795f9 | 1507 | overhead = ext4_group_overhead_blocks(sb, group + i); |
19c5246d | 1508 | group_data[i].free_blocks_count = blocks_per_group - overhead; |
7f511862 | 1509 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1510 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1511 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1512 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1513 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1514 | } else | |
19c5246d YY |
1515 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1516 | } | |
1517 | ||
feb0ab32 | 1518 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1519 | /* We need to initialize block bitmap of last group. */ |
1520 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1521 | ||
1522 | if ((last_group == n_group) && (last != blocks_per_group - 1)) { | |
1523 | group_data[i - 1].blocks_count = last + 1; | |
1524 | group_data[i - 1].free_blocks_count -= blocks_per_group- | |
1525 | last - 1; | |
1526 | } | |
1527 | ||
1528 | return 1; | |
1529 | } | |
1530 | ||
ac27a0ec DK |
1531 | /* Add group descriptor data to an existing or new group descriptor block. |
1532 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1533 | * the filesystem, because we cannot abort the transaction and not have it | |
1534 | * write the data to disk. | |
1535 | * | |
1536 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1537 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1538 | * | |
1539 | * We only need to hold the superblock lock while we are actually adding | |
1540 | * in the new group's counts to the superblock. Prior to that we have | |
1541 | * not really "added" the group at all. We re-check that we are still | |
1542 | * adding in the last group in case things have changed since verifying. | |
1543 | */ | |
617ba13b | 1544 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1545 | { |
61f296cc | 1546 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1547 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1548 | struct ext4_super_block *es = sbi->s_es; | |
1549 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1550 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1551 | struct inode *inode = NULL; |
ac27a0ec | 1552 | int gdb_off, gdb_num; |
61f296cc YY |
1553 | int err; |
1554 | __u16 bg_flags = 0; | |
ac27a0ec | 1555 | |
617ba13b MC |
1556 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
1557 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 1558 | |
617ba13b MC |
1559 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1560 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1561 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1562 | return -EPERM; |
1563 | } | |
1564 | ||
bd81d8ee LV |
1565 | if (ext4_blocks_count(es) + input->blocks_count < |
1566 | ext4_blocks_count(es)) { | |
12062ddd | 1567 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1568 | return -EINVAL; |
1569 | } | |
1570 | ||
617ba13b | 1571 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1572 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1573 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1574 | return -EINVAL; |
1575 | } | |
1576 | ||
1577 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1578 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1579 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1580 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1581 | ext4_warning(sb, |
ac27a0ec DK |
1582 | "No reserved GDT blocks, can't resize"); |
1583 | return -EPERM; | |
1584 | } | |
1d1fe1ee DH |
1585 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1586 | if (IS_ERR(inode)) { | |
12062ddd | 1587 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1588 | return PTR_ERR(inode); |
ac27a0ec DK |
1589 | } |
1590 | } | |
1591 | ||
920313a7 | 1592 | |
61f296cc | 1593 | err = verify_group_input(sb, input); |
08c3a813 | 1594 | if (err) |
61f296cc | 1595 | goto out; |
ac27a0ec | 1596 | |
117fff10 TT |
1597 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1598 | if (err) | |
7f511862 | 1599 | goto out; |
117fff10 | 1600 | |
28623c2f TT |
1601 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1602 | if (err) | |
1603 | goto out; | |
1604 | ||
61f296cc YY |
1605 | flex_gd.count = 1; |
1606 | flex_gd.groups = input; | |
1607 | flex_gd.bg_flags = &bg_flags; | |
1608 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1609 | out: | |
ac27a0ec DK |
1610 | iput(inode); |
1611 | return err; | |
617ba13b | 1612 | } /* ext4_group_add */ |
ac27a0ec | 1613 | |
18e31438 YY |
1614 | /* |
1615 | * extend a group without checking assuming that checking has been done. | |
1616 | */ | |
1617 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1618 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1619 | { | |
1620 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1621 | handle_t *handle; | |
1622 | int err = 0, err2; | |
1623 | ||
1624 | /* We will update the superblock, one block bitmap, and | |
1625 | * one group descriptor via ext4_group_add_blocks(). | |
1626 | */ | |
9924a92a | 1627 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1628 | if (IS_ERR(handle)) { |
1629 | err = PTR_ERR(handle); | |
1630 | ext4_warning(sb, "error %d on journal start", err); | |
1631 | return err; | |
1632 | } | |
1633 | ||
1634 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1635 | if (err) { | |
1636 | ext4_warning(sb, "error %d on journal write access", err); | |
1637 | goto errout; | |
1638 | } | |
1639 | ||
1640 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1641 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1642 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1643 | o_blocks_count + add); | |
1644 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1645 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1646 | if (err) | |
1647 | goto errout; | |
1648 | ext4_handle_dirty_super(handle, sb); | |
1649 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1650 | o_blocks_count + add); | |
1651 | errout: | |
1652 | err2 = ext4_journal_stop(handle); | |
1653 | if (err2 && !err) | |
1654 | err = err2; | |
1655 | ||
1656 | if (!err) { | |
01f795f9 YY |
1657 | ext4_fsblk_t first_block; |
1658 | first_block = ext4_group_first_block_no(sb, 0); | |
18e31438 YY |
1659 | if (test_opt(sb, DEBUG)) |
1660 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1661 | "blocks\n", ext4_blocks_count(es)); | |
01f795f9 YY |
1662 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr - first_block, |
1663 | (char *)es, sizeof(struct ext4_super_block), 0); | |
18e31438 YY |
1664 | } |
1665 | return err; | |
1666 | } | |
1667 | ||
2b2d6d01 TT |
1668 | /* |
1669 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1670 | * point is only used to extend the current filesystem to the end of the last |
1671 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1672 | * for emergencies (because it has no dependencies on reserved blocks). | |
1673 | * | |
617ba13b | 1674 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1675 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1676 | * GDT blocks are reserved to grow to the desired size. | |
1677 | */ | |
617ba13b MC |
1678 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1679 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1680 | { |
617ba13b | 1681 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1682 | ext4_grpblk_t last; |
1683 | ext4_grpblk_t add; | |
af5bc92d | 1684 | struct buffer_head *bh; |
d89651c8 | 1685 | int err; |
5f21b0e6 | 1686 | ext4_group_t group; |
ac27a0ec | 1687 | |
bd81d8ee | 1688 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1689 | |
1690 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1691 | ext4_msg(sb, KERN_DEBUG, |
1692 | "extending last group from %llu to %llu blocks", | |
1693 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1694 | |
1695 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1696 | return 0; | |
1697 | ||
1698 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1699 | ext4_msg(sb, KERN_ERR, |
1700 | "filesystem too large to resize to %llu blocks safely", | |
1701 | n_blocks_count); | |
ac27a0ec | 1702 | if (sizeof(sector_t) < 8) |
12062ddd | 1703 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1704 | return -EINVAL; |
1705 | } | |
1706 | ||
1707 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1708 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1709 | return -EINVAL; |
ac27a0ec DK |
1710 | } |
1711 | ||
1712 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1713 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1714 | |
1715 | if (last == 0) { | |
12062ddd | 1716 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1717 | return -EPERM; |
1718 | } | |
1719 | ||
617ba13b | 1720 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1721 | |
1722 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1723 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1724 | return -EINVAL; |
1725 | } | |
1726 | ||
1727 | if (o_blocks_count + add > n_blocks_count) | |
1728 | add = n_blocks_count - o_blocks_count; | |
1729 | ||
1730 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1731 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1732 | o_blocks_count + add, add); |
1733 | ||
1734 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1735 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1736 | if (!bh) { |
12062ddd | 1737 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1738 | return -ENOSPC; |
1739 | } | |
1740 | brelse(bh); | |
1741 | ||
d89651c8 | 1742 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1743 | return err; |
617ba13b | 1744 | } /* ext4_group_extend */ |
19c5246d | 1745 | |
1c6bd717 TT |
1746 | |
1747 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1748 | { | |
1749 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * Release the resize inode and drop the resize_inode feature if there | |
1754 | * are no more reserved gdt blocks, and then convert the file system | |
1755 | * to enable meta_bg | |
1756 | */ | |
1757 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1758 | { | |
1759 | handle_t *handle; | |
1760 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1761 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1762 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1763 | ext4_fsblk_t nr; |
1764 | int i, ret, err = 0; | |
1765 | int credits = 1; | |
1766 | ||
1767 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1768 | if (inode) { |
1c6bd717 TT |
1769 | if (es->s_reserved_gdt_blocks) { |
1770 | ext4_error(sb, "Unexpected non-zero " | |
1771 | "s_reserved_gdt_blocks"); | |
1772 | return -EPERM; | |
1773 | } | |
1c6bd717 TT |
1774 | |
1775 | /* Do a quick sanity check of the resize inode */ | |
1776 | if (inode->i_blocks != 1 << (inode->i_blkbits - 9)) | |
1777 | goto invalid_resize_inode; | |
1778 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1779 | if (i == EXT4_DIND_BLOCK) { | |
1780 | if (ei->i_data[i]) | |
1781 | continue; | |
1782 | else | |
1783 | goto invalid_resize_inode; | |
1784 | } | |
1785 | if (ei->i_data[i]) | |
1786 | goto invalid_resize_inode; | |
1787 | } | |
1788 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1789 | } | |
1790 | ||
9924a92a | 1791 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1792 | if (IS_ERR(handle)) |
1793 | return PTR_ERR(handle); | |
1794 | ||
1795 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1796 | if (err) | |
1797 | goto errout; | |
1798 | ||
1799 | EXT4_CLEAR_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE); | |
1800 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); | |
1801 | sbi->s_es->s_first_meta_bg = | |
1802 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
1803 | ||
1804 | err = ext4_handle_dirty_super(handle, sb); | |
1805 | if (err) { | |
1806 | ext4_std_error(sb, err); | |
1807 | goto errout; | |
1808 | } | |
1809 | ||
1810 | if (inode) { | |
1811 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1812 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1813 | EXT4_FREE_BLOCKS_METADATA | | |
1814 | EXT4_FREE_BLOCKS_FORGET); | |
1815 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1816 | inode->i_blocks = 0; | |
1817 | ||
1818 | err = ext4_mark_inode_dirty(handle, inode); | |
1819 | if (err) | |
1820 | ext4_std_error(sb, err); | |
1821 | } | |
1822 | ||
1823 | errout: | |
1824 | ret = ext4_journal_stop(handle); | |
1825 | if (!err) | |
1826 | err = ret; | |
1827 | return ret; | |
1828 | ||
1829 | invalid_resize_inode: | |
1830 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1831 | return -EINVAL; | |
1832 | } | |
1833 | ||
19c5246d YY |
1834 | /* |
1835 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1836 | * | |
1837 | * @sb: super block of the fs to be resized | |
1838 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1839 | */ | |
1840 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1841 | { | |
1842 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1843 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1844 | struct ext4_super_block *es = sbi->s_es; | |
1845 | struct buffer_head *bh; | |
01f795f9 YY |
1846 | struct inode *resize_inode = NULL; |
1847 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1848 | unsigned long n_desc_blocks; |
1849 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1850 | ext4_group_t o_group; |
1851 | ext4_group_t n_group; | |
1852 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1853 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1854 | unsigned long last_update_time = 0; |
117fff10 | 1855 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1856 | int meta_bg; |
19c5246d | 1857 | |
59e31c15 TT |
1858 | /* See if the device is actually as big as what was requested */ |
1859 | bh = sb_bread(sb, n_blocks_count - 1); | |
1860 | if (!bh) { | |
1861 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1862 | return -ENOSPC; | |
1863 | } | |
1864 | brelse(bh); | |
1865 | ||
1c6bd717 | 1866 | retry: |
19c5246d YY |
1867 | o_blocks_count = ext4_blocks_count(es); |
1868 | ||
59e31c15 TT |
1869 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1870 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1871 | |
1872 | if (n_blocks_count < o_blocks_count) { | |
1873 | /* On-line shrinking not supported */ | |
1874 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1875 | return -EINVAL; | |
1876 | } | |
1877 | ||
1878 | if (n_blocks_count == o_blocks_count) | |
1879 | /* Nothing need to do */ | |
1880 | return 0; | |
1881 | ||
1882 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); | |
a0ade1de | 1883 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1884 | |
1c6bd717 TT |
1885 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1886 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1887 | |
01f795f9 | 1888 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
19c5246d | 1889 | |
01f795f9 YY |
1890 | if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE)) { |
1891 | if (meta_bg) { | |
1892 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1893 | "simultaneously"); | |
1894 | return -EINVAL; | |
1895 | } | |
1c6bd717 TT |
1896 | if (n_desc_blocks > o_desc_blocks + |
1897 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1898 | n_blocks_count_retry = n_blocks_count; | |
1899 | n_desc_blocks = o_desc_blocks + | |
1900 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
1901 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
1902 | n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb); | |
1903 | n_group--; /* set to last group number */ | |
01f795f9 | 1904 | } |
1c6bd717 TT |
1905 | |
1906 | if (!resize_inode) | |
1907 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
01f795f9 YY |
1908 | if (IS_ERR(resize_inode)) { |
1909 | ext4_warning(sb, "Error opening resize inode"); | |
1910 | return PTR_ERR(resize_inode); | |
1911 | } | |
1c6bd717 TT |
1912 | } |
1913 | ||
59e31c15 | 1914 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
1915 | err = ext4_convert_meta_bg(sb, resize_inode); |
1916 | if (err) | |
1917 | goto out; | |
1918 | if (resize_inode) { | |
1919 | iput(resize_inode); | |
1920 | resize_inode = NULL; | |
1921 | } | |
1922 | if (n_blocks_count_retry) { | |
1923 | n_blocks_count = n_blocks_count_retry; | |
1924 | n_blocks_count_retry = 0; | |
1925 | goto retry; | |
1926 | } | |
19c5246d YY |
1927 | } |
1928 | ||
a0ade1de LC |
1929 | /* extend the last group */ |
1930 | if (n_group == o_group) | |
1931 | add = n_blocks_count - o_blocks_count; | |
1932 | else | |
1933 | add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); | |
1934 | if (add > 0) { | |
19c5246d YY |
1935 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1936 | if (err) | |
1937 | goto out; | |
1938 | } | |
1939 | ||
d7574ad0 | 1940 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
1941 | goto out; |
1942 | ||
117fff10 TT |
1943 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
1944 | if (err) | |
1945 | return err; | |
1946 | ||
28623c2f TT |
1947 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
1948 | if (err) | |
1949 | goto out; | |
1950 | ||
19c5246d YY |
1951 | flex_gd = alloc_flex_gd(flexbg_size); |
1952 | if (flex_gd == NULL) { | |
1953 | err = -ENOMEM; | |
1954 | goto out; | |
1955 | } | |
1956 | ||
1957 | /* Add flex groups. Note that a regular group is a | |
1958 | * flex group with 1 group. | |
1959 | */ | |
1960 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
1961 | flexbg_size)) { | |
4da4a56e TT |
1962 | if (jiffies - last_update_time > HZ * 10) { |
1963 | if (last_update_time) | |
1964 | ext4_msg(sb, KERN_INFO, | |
1965 | "resized to %llu blocks", | |
1966 | ext4_blocks_count(es)); | |
1967 | last_update_time = jiffies; | |
1968 | } | |
03c1c290 YY |
1969 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
1970 | break; | |
19c5246d YY |
1971 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
1972 | if (unlikely(err)) | |
1973 | break; | |
1974 | } | |
1975 | ||
1c6bd717 TT |
1976 | if (!err && n_blocks_count_retry) { |
1977 | n_blocks_count = n_blocks_count_retry; | |
1978 | n_blocks_count_retry = 0; | |
1979 | free_flex_gd(flex_gd); | |
1980 | flex_gd = NULL; | |
1981 | goto retry; | |
1982 | } | |
1983 | ||
19c5246d YY |
1984 | out: |
1985 | if (flex_gd) | |
1986 | free_flex_gd(flex_gd); | |
01f795f9 YY |
1987 | if (resize_inode != NULL) |
1988 | iput(resize_inode); | |
59e31c15 | 1989 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count); |
19c5246d YY |
1990 | return err; |
1991 | } |