Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * linux/fs/ext4/resize.c
4 : *
5 : * Support for resizing an ext4 filesystem while it is mounted.
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 :
13 : #define EXT4FS_DEBUG
14 :
15 : #include <linux/errno.h>
16 : #include <linux/slab.h>
17 : #include <linux/jiffies.h>
18 :
19 : #include "ext4_jbd2.h"
20 :
21 : struct ext4_rcu_ptr {
22 : struct rcu_head rcu;
23 : void *ptr;
24 : };
25 :
26 0 : static void ext4_rcu_ptr_callback(struct rcu_head *head)
27 : {
28 0 : struct ext4_rcu_ptr *ptr;
29 :
30 0 : ptr = container_of(head, struct ext4_rcu_ptr, rcu);
31 0 : kvfree(ptr->ptr);
32 0 : kfree(ptr);
33 0 : }
34 :
35 0 : void ext4_kvfree_array_rcu(void *to_free)
36 : {
37 0 : struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
38 :
39 0 : if (ptr) {
40 0 : ptr->ptr = to_free;
41 0 : call_rcu(&ptr->rcu, ext4_rcu_ptr_callback);
42 0 : return;
43 : }
44 0 : synchronize_rcu();
45 0 : kvfree(to_free);
46 : }
47 :
48 0 : int ext4_resize_begin(struct super_block *sb)
49 : {
50 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
51 0 : int ret = 0;
52 :
53 0 : if (!capable(CAP_SYS_RESOURCE))
54 : return -EPERM;
55 :
56 : /*
57 : * If the reserved GDT blocks is non-zero, the resize_inode feature
58 : * should always be set.
59 : */
60 0 : if (EXT4_SB(sb)->s_es->s_reserved_gdt_blocks &&
61 : !ext4_has_feature_resize_inode(sb)) {
62 0 : ext4_error(sb, "resize_inode disabled but reserved GDT blocks non-zero");
63 0 : return -EFSCORRUPTED;
64 : }
65 :
66 : /*
67 : * If we are not using the primary superblock/GDT copy don't resize,
68 : * because the user tools have no way of handling this. Probably a
69 : * bad time to do it anyways.
70 : */
71 0 : if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) !=
72 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
73 0 : ext4_warning(sb, "won't resize using backup superblock at %llu",
74 : (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
75 0 : return -EPERM;
76 : }
77 :
78 : /*
79 : * We are not allowed to do online-resizing on a filesystem mounted
80 : * with error, because it can destroy the filesystem easily.
81 : */
82 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
83 0 : ext4_warning(sb, "There are errors in the filesystem, "
84 : "so online resizing is not allowed");
85 0 : return -EPERM;
86 : }
87 :
88 0 : if (ext4_has_feature_sparse_super2(sb)) {
89 0 : ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2");
90 0 : return -EOPNOTSUPP;
91 : }
92 :
93 0 : if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
94 0 : &EXT4_SB(sb)->s_ext4_flags))
95 0 : ret = -EBUSY;
96 :
97 : return ret;
98 : }
99 :
100 0 : int ext4_resize_end(struct super_block *sb, bool update_backups)
101 : {
102 0 : clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
103 0 : smp_mb__after_atomic();
104 0 : if (update_backups)
105 0 : return ext4_update_overhead(sb, true);
106 : return 0;
107 : }
108 :
109 : static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
110 : ext4_group_t group) {
111 0 : return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
112 : EXT4_DESC_PER_BLOCK_BITS(sb);
113 : }
114 :
115 : static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
116 : ext4_group_t group) {
117 0 : group = ext4_meta_bg_first_group(sb, group);
118 0 : return ext4_group_first_block_no(sb, group);
119 : }
120 :
121 0 : static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
122 : ext4_group_t group) {
123 0 : ext4_grpblk_t overhead;
124 0 : overhead = ext4_bg_num_gdb(sb, group);
125 0 : if (ext4_bg_has_super(sb, group))
126 0 : overhead += 1 +
127 0 : le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
128 0 : return overhead;
129 : }
130 :
131 : #define outside(b, first, last) ((b) < (first) || (b) >= (last))
132 : #define inside(b, first, last) ((b) >= (first) && (b) < (last))
133 :
134 0 : static int verify_group_input(struct super_block *sb,
135 : struct ext4_new_group_data *input)
136 : {
137 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
138 0 : struct ext4_super_block *es = sbi->s_es;
139 0 : ext4_fsblk_t start = ext4_blocks_count(es);
140 0 : ext4_fsblk_t end = start + input->blocks_count;
141 0 : ext4_group_t group = input->group;
142 0 : ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
143 0 : unsigned overhead;
144 0 : ext4_fsblk_t metaend;
145 0 : struct buffer_head *bh = NULL;
146 0 : ext4_grpblk_t free_blocks_count, offset;
147 0 : int err = -EINVAL;
148 :
149 0 : if (group != sbi->s_groups_count) {
150 0 : ext4_warning(sb, "Cannot add at group %u (only %u groups)",
151 : input->group, sbi->s_groups_count);
152 0 : return -EINVAL;
153 : }
154 :
155 0 : overhead = ext4_group_overhead_blocks(sb, group);
156 0 : metaend = start + overhead;
157 0 : input->free_clusters_count = free_blocks_count =
158 0 : input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
159 :
160 0 : if (test_opt(sb, DEBUG))
161 0 : printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
162 : "(%d free, %u reserved)\n",
163 : ext4_bg_has_super(sb, input->group) ? "normal" :
164 : "no-super", input->group, input->blocks_count,
165 : free_blocks_count, input->reserved_blocks);
166 :
167 0 : ext4_get_group_no_and_offset(sb, start, NULL, &offset);
168 0 : if (offset != 0)
169 0 : ext4_warning(sb, "Last group not full");
170 0 : else if (input->reserved_blocks > input->blocks_count / 5)
171 0 : ext4_warning(sb, "Reserved blocks too high (%u)",
172 : input->reserved_blocks);
173 0 : else if (free_blocks_count < 0)
174 0 : ext4_warning(sb, "Bad blocks count %u",
175 : input->blocks_count);
176 0 : else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) {
177 0 : err = PTR_ERR(bh);
178 0 : bh = NULL;
179 0 : ext4_warning(sb, "Cannot read last block (%llu)",
180 : end - 1);
181 0 : } else if (outside(input->block_bitmap, start, end))
182 0 : ext4_warning(sb, "Block bitmap not in group (block %llu)",
183 : (unsigned long long)input->block_bitmap);
184 0 : else if (outside(input->inode_bitmap, start, end))
185 0 : ext4_warning(sb, "Inode bitmap not in group (block %llu)",
186 : (unsigned long long)input->inode_bitmap);
187 0 : else if (outside(input->inode_table, start, end) ||
188 0 : outside(itend - 1, start, end))
189 0 : ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
190 : (unsigned long long)input->inode_table, itend - 1);
191 0 : else if (input->inode_bitmap == input->block_bitmap)
192 0 : ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
193 : (unsigned long long)input->block_bitmap);
194 0 : else if (inside(input->block_bitmap, input->inode_table, itend))
195 0 : ext4_warning(sb, "Block bitmap (%llu) in inode table "
196 : "(%llu-%llu)",
197 : (unsigned long long)input->block_bitmap,
198 : (unsigned long long)input->inode_table, itend - 1);
199 0 : else if (inside(input->inode_bitmap, input->inode_table, itend))
200 0 : ext4_warning(sb, "Inode bitmap (%llu) in inode table "
201 : "(%llu-%llu)",
202 : (unsigned long long)input->inode_bitmap,
203 : (unsigned long long)input->inode_table, itend - 1);
204 0 : else if (inside(input->block_bitmap, start, metaend))
205 0 : ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
206 : (unsigned long long)input->block_bitmap,
207 : start, metaend - 1);
208 0 : else if (inside(input->inode_bitmap, start, metaend))
209 0 : ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
210 : (unsigned long long)input->inode_bitmap,
211 : start, metaend - 1);
212 0 : else if (inside(input->inode_table, start, metaend) ||
213 0 : inside(itend - 1, start, metaend))
214 0 : ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
215 : "(%llu-%llu)",
216 : (unsigned long long)input->inode_table,
217 : itend - 1, start, metaend - 1);
218 : else
219 : err = 0;
220 0 : brelse(bh);
221 :
222 : return err;
223 : }
224 :
225 : /*
226 : * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
227 : * group each time.
228 : */
229 : struct ext4_new_flex_group_data {
230 : struct ext4_new_group_data *groups; /* new_group_data for groups
231 : in the flex group */
232 : __u16 *bg_flags; /* block group flags of groups
233 : in @groups */
234 : ext4_group_t count; /* number of groups in @groups
235 : */
236 : };
237 :
238 : /*
239 : * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
240 : * @flexbg_size.
241 : *
242 : * Returns NULL on failure otherwise address of the allocated structure.
243 : */
244 0 : static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
245 : {
246 0 : struct ext4_new_flex_group_data *flex_gd;
247 :
248 0 : flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
249 0 : if (flex_gd == NULL)
250 0 : goto out3;
251 :
252 0 : if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
253 0 : goto out2;
254 0 : flex_gd->count = flexbg_size;
255 :
256 0 : flex_gd->groups = kmalloc_array(flexbg_size,
257 : sizeof(struct ext4_new_group_data),
258 : GFP_NOFS);
259 0 : if (flex_gd->groups == NULL)
260 0 : goto out2;
261 :
262 0 : flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16),
263 : GFP_NOFS);
264 0 : if (flex_gd->bg_flags == NULL)
265 0 : goto out1;
266 :
267 : return flex_gd;
268 :
269 : out1:
270 0 : kfree(flex_gd->groups);
271 0 : out2:
272 0 : kfree(flex_gd);
273 : out3:
274 : return NULL;
275 : }
276 :
277 0 : static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
278 : {
279 0 : kfree(flex_gd->bg_flags);
280 0 : kfree(flex_gd->groups);
281 0 : kfree(flex_gd);
282 0 : }
283 :
284 : /*
285 : * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
286 : * and inode tables for a flex group.
287 : *
288 : * This function is used by 64bit-resize. Note that this function allocates
289 : * group tables from the 1st group of groups contained by @flexgd, which may
290 : * be a partial of a flex group.
291 : *
292 : * @sb: super block of fs to which the groups belongs
293 : *
294 : * Returns 0 on a successful allocation of the metadata blocks in the
295 : * block group.
296 : */
297 0 : static int ext4_alloc_group_tables(struct super_block *sb,
298 : struct ext4_new_flex_group_data *flex_gd,
299 : int flexbg_size)
300 : {
301 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
302 0 : ext4_fsblk_t start_blk;
303 0 : ext4_fsblk_t last_blk;
304 0 : ext4_group_t src_group;
305 0 : ext4_group_t bb_index = 0;
306 0 : ext4_group_t ib_index = 0;
307 0 : ext4_group_t it_index = 0;
308 0 : ext4_group_t group;
309 0 : ext4_group_t last_group;
310 0 : unsigned overhead;
311 0 : __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
312 0 : int i;
313 :
314 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
315 :
316 0 : src_group = group_data[0].group;
317 0 : last_group = src_group + flex_gd->count - 1;
318 :
319 0 : BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
320 : (last_group & ~(flexbg_size - 1))));
321 0 : next_group:
322 0 : group = group_data[0].group;
323 0 : if (src_group >= group_data[0].group + flex_gd->count)
324 : return -ENOSPC;
325 0 : start_blk = ext4_group_first_block_no(sb, src_group);
326 0 : last_blk = start_blk + group_data[src_group - group].blocks_count;
327 :
328 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
329 :
330 0 : start_blk += overhead;
331 :
332 : /* We collect contiguous blocks as much as possible. */
333 0 : src_group++;
334 0 : for (; src_group <= last_group; src_group++) {
335 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
336 0 : if (overhead == 0)
337 0 : last_blk += group_data[src_group - group].blocks_count;
338 : else
339 : break;
340 : }
341 :
342 : /* Allocate block bitmaps */
343 0 : for (; bb_index < flex_gd->count; bb_index++) {
344 0 : if (start_blk >= last_blk)
345 0 : goto next_group;
346 0 : group_data[bb_index].block_bitmap = start_blk++;
347 0 : group = ext4_get_group_number(sb, start_blk - 1);
348 0 : group -= group_data[0].group;
349 0 : group_data[group].mdata_blocks++;
350 0 : flex_gd->bg_flags[group] &= uninit_mask;
351 : }
352 :
353 : /* Allocate inode bitmaps */
354 0 : for (; ib_index < flex_gd->count; ib_index++) {
355 0 : if (start_blk >= last_blk)
356 0 : goto next_group;
357 0 : group_data[ib_index].inode_bitmap = start_blk++;
358 0 : group = ext4_get_group_number(sb, start_blk - 1);
359 0 : group -= group_data[0].group;
360 0 : group_data[group].mdata_blocks++;
361 0 : flex_gd->bg_flags[group] &= uninit_mask;
362 : }
363 :
364 : /* Allocate inode tables */
365 0 : for (; it_index < flex_gd->count; it_index++) {
366 0 : unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
367 0 : ext4_fsblk_t next_group_start;
368 :
369 0 : if (start_blk + itb > last_blk)
370 0 : goto next_group;
371 0 : group_data[it_index].inode_table = start_blk;
372 0 : group = ext4_get_group_number(sb, start_blk);
373 0 : next_group_start = ext4_group_first_block_no(sb, group + 1);
374 0 : group -= group_data[0].group;
375 :
376 0 : if (start_blk + itb > next_group_start) {
377 0 : flex_gd->bg_flags[group + 1] &= uninit_mask;
378 0 : overhead = start_blk + itb - next_group_start;
379 0 : group_data[group + 1].mdata_blocks += overhead;
380 0 : itb -= overhead;
381 : }
382 :
383 0 : group_data[group].mdata_blocks += itb;
384 0 : flex_gd->bg_flags[group] &= uninit_mask;
385 0 : start_blk += EXT4_SB(sb)->s_itb_per_group;
386 : }
387 :
388 : /* Update free clusters count to exclude metadata blocks */
389 0 : for (i = 0; i < flex_gd->count; i++) {
390 0 : group_data[i].free_clusters_count -=
391 0 : EXT4_NUM_B2C(EXT4_SB(sb),
392 : group_data[i].mdata_blocks);
393 : }
394 :
395 0 : if (test_opt(sb, DEBUG)) {
396 0 : int i;
397 0 : group = group_data[0].group;
398 :
399 0 : printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
400 : "%d groups, flexbg size is %d:\n", flex_gd->count,
401 : flexbg_size);
402 :
403 0 : for (i = 0; i < flex_gd->count; i++) {
404 0 : ext4_debug(
405 : "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n",
406 : ext4_bg_has_super(sb, group + i) ? "normal" :
407 : "no-super", group + i,
408 : group_data[i].blocks_count,
409 : group_data[i].free_clusters_count,
410 : group_data[i].mdata_blocks);
411 : }
412 : }
413 : return 0;
414 : }
415 :
416 0 : static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
417 : ext4_fsblk_t blk)
418 : {
419 0 : struct buffer_head *bh;
420 0 : int err;
421 :
422 0 : bh = sb_getblk(sb, blk);
423 0 : if (unlikely(!bh))
424 : return ERR_PTR(-ENOMEM);
425 0 : BUFFER_TRACE(bh, "get_write_access");
426 0 : err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
427 0 : if (err) {
428 0 : brelse(bh);
429 0 : bh = ERR_PTR(err);
430 : } else {
431 0 : memset(bh->b_data, 0, sb->s_blocksize);
432 0 : set_buffer_uptodate(bh);
433 : }
434 :
435 : return bh;
436 : }
437 :
438 0 : static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits)
439 : {
440 0 : return ext4_journal_ensure_credits_fn(handle, credits,
441 : EXT4_MAX_TRANS_DATA, 0, 0);
442 : }
443 :
444 : /*
445 : * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used.
446 : *
447 : * Helper function for ext4_setup_new_group_blocks() which set .
448 : *
449 : * @sb: super block
450 : * @handle: journal handle
451 : * @flex_gd: flex group data
452 : */
453 0 : static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
454 : struct ext4_new_flex_group_data *flex_gd,
455 : ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster)
456 : {
457 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
458 0 : ext4_group_t count = last_cluster - first_cluster + 1;
459 0 : ext4_group_t count2;
460 :
461 0 : ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster,
462 : last_cluster);
463 0 : for (count2 = count; count > 0;
464 0 : count -= count2, first_cluster += count2) {
465 0 : ext4_fsblk_t start;
466 0 : struct buffer_head *bh;
467 0 : ext4_group_t group;
468 0 : int err;
469 :
470 0 : group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster));
471 0 : start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group));
472 0 : group -= flex_gd->groups[0].group;
473 :
474 0 : count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start);
475 0 : if (count2 > count)
476 : count2 = count;
477 :
478 0 : if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
479 0 : BUG_ON(flex_gd->count > 1);
480 0 : continue;
481 : }
482 :
483 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
484 0 : if (err < 0)
485 0 : return err;
486 :
487 0 : bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
488 0 : if (unlikely(!bh))
489 : return -ENOMEM;
490 :
491 0 : BUFFER_TRACE(bh, "get_write_access");
492 0 : err = ext4_journal_get_write_access(handle, sb, bh,
493 : EXT4_JTR_NONE);
494 0 : if (err) {
495 0 : brelse(bh);
496 0 : return err;
497 : }
498 0 : ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n",
499 : first_cluster, first_cluster - start, count2);
500 0 : mb_set_bits(bh->b_data, first_cluster - start, count2);
501 :
502 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
503 0 : brelse(bh);
504 0 : if (unlikely(err))
505 0 : return err;
506 : }
507 :
508 : return 0;
509 : }
510 :
511 : /*
512 : * Set up the block and inode bitmaps, and the inode table for the new groups.
513 : * This doesn't need to be part of the main transaction, since we are only
514 : * changing blocks outside the actual filesystem. We still do journaling to
515 : * ensure the recovery is correct in case of a failure just after resize.
516 : * If any part of this fails, we simply abort the resize.
517 : *
518 : * setup_new_flex_group_blocks handles a flex group as follow:
519 : * 1. copy super block and GDT, and initialize group tables if necessary.
520 : * In this step, we only set bits in blocks bitmaps for blocks taken by
521 : * super block and GDT.
522 : * 2. allocate group tables in block bitmaps, that is, set bits in block
523 : * bitmap for blocks taken by group tables.
524 : */
525 0 : static int setup_new_flex_group_blocks(struct super_block *sb,
526 : struct ext4_new_flex_group_data *flex_gd)
527 : {
528 0 : int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
529 0 : ext4_fsblk_t start;
530 0 : ext4_fsblk_t block;
531 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
532 0 : struct ext4_super_block *es = sbi->s_es;
533 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
534 0 : __u16 *bg_flags = flex_gd->bg_flags;
535 0 : handle_t *handle;
536 0 : ext4_group_t group, count;
537 0 : struct buffer_head *bh = NULL;
538 0 : int reserved_gdb, i, j, err = 0, err2;
539 0 : int meta_bg;
540 :
541 0 : BUG_ON(!flex_gd->count || !group_data ||
542 : group_data[0].group != sbi->s_groups_count);
543 :
544 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
545 0 : meta_bg = ext4_has_feature_meta_bg(sb);
546 :
547 : /* This transaction may be extended/restarted along the way */
548 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
549 0 : if (IS_ERR(handle))
550 0 : return PTR_ERR(handle);
551 :
552 0 : group = group_data[0].group;
553 0 : for (i = 0; i < flex_gd->count; i++, group++) {
554 0 : unsigned long gdblocks;
555 0 : ext4_grpblk_t overhead;
556 :
557 0 : gdblocks = ext4_bg_num_gdb(sb, group);
558 0 : start = ext4_group_first_block_no(sb, group);
559 :
560 0 : if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
561 0 : goto handle_itb;
562 :
563 0 : if (meta_bg == 1) {
564 0 : ext4_group_t first_group;
565 0 : first_group = ext4_meta_bg_first_group(sb, group);
566 0 : if (first_group != group + 1 &&
567 0 : first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
568 0 : goto handle_itb;
569 : }
570 :
571 0 : block = start + ext4_bg_has_super(sb, group);
572 : /* Copy all of the GDT blocks into the backup in this group */
573 0 : for (j = 0; j < gdblocks; j++, block++) {
574 0 : struct buffer_head *gdb;
575 :
576 0 : ext4_debug("update backup group %#04llx\n", block);
577 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
578 0 : if (err < 0)
579 0 : goto out;
580 :
581 0 : gdb = sb_getblk(sb, block);
582 0 : if (unlikely(!gdb)) {
583 0 : err = -ENOMEM;
584 0 : goto out;
585 : }
586 :
587 0 : BUFFER_TRACE(gdb, "get_write_access");
588 0 : err = ext4_journal_get_write_access(handle, sb, gdb,
589 : EXT4_JTR_NONE);
590 0 : if (err) {
591 0 : brelse(gdb);
592 0 : goto out;
593 : }
594 0 : memcpy(gdb->b_data, sbi_array_rcu_deref(sbi,
595 : s_group_desc, j)->b_data, gdb->b_size);
596 0 : set_buffer_uptodate(gdb);
597 :
598 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb);
599 0 : if (unlikely(err)) {
600 0 : brelse(gdb);
601 0 : goto out;
602 : }
603 0 : brelse(gdb);
604 : }
605 :
606 : /* Zero out all of the reserved backup group descriptor
607 : * table blocks
608 : */
609 0 : if (ext4_bg_has_super(sb, group)) {
610 0 : err = sb_issue_zeroout(sb, gdblocks + start + 1,
611 : reserved_gdb, GFP_NOFS);
612 0 : if (err)
613 0 : goto out;
614 : }
615 :
616 0 : handle_itb:
617 : /* Initialize group tables of the grop @group */
618 0 : if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
619 0 : goto handle_bb;
620 :
621 : /* Zero out all of the inode table blocks */
622 0 : block = group_data[i].inode_table;
623 0 : ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
624 : block, sbi->s_itb_per_group);
625 0 : err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
626 : GFP_NOFS);
627 0 : if (err)
628 0 : goto out;
629 :
630 0 : handle_bb:
631 0 : if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
632 0 : goto handle_ib;
633 :
634 : /* Initialize block bitmap of the @group */
635 0 : block = group_data[i].block_bitmap;
636 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
637 0 : if (err < 0)
638 0 : goto out;
639 :
640 0 : bh = bclean(handle, sb, block);
641 0 : if (IS_ERR(bh)) {
642 0 : err = PTR_ERR(bh);
643 0 : goto out;
644 : }
645 0 : overhead = ext4_group_overhead_blocks(sb, group);
646 0 : if (overhead != 0) {
647 0 : ext4_debug("mark backup superblock %#04llx (+0)\n",
648 : start);
649 0 : mb_set_bits(bh->b_data, 0,
650 0 : EXT4_NUM_B2C(sbi, overhead));
651 : }
652 0 : ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count),
653 0 : sb->s_blocksize * 8, bh->b_data);
654 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
655 0 : brelse(bh);
656 0 : if (err)
657 0 : goto out;
658 :
659 0 : handle_ib:
660 0 : if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
661 0 : continue;
662 :
663 : /* Initialize inode bitmap of the @group */
664 0 : block = group_data[i].inode_bitmap;
665 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
666 0 : if (err < 0)
667 0 : goto out;
668 : /* Mark unused entries in inode bitmap used */
669 0 : bh = bclean(handle, sb, block);
670 0 : if (IS_ERR(bh)) {
671 0 : err = PTR_ERR(bh);
672 0 : goto out;
673 : }
674 :
675 0 : ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
676 0 : sb->s_blocksize * 8, bh->b_data);
677 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
678 0 : brelse(bh);
679 0 : if (err)
680 0 : goto out;
681 : }
682 :
683 : /* Mark group tables in block bitmap */
684 0 : for (j = 0; j < GROUP_TABLE_COUNT; j++) {
685 0 : count = group_table_count[j];
686 0 : start = (&group_data[0].block_bitmap)[j];
687 0 : block = start;
688 0 : for (i = 1; i < flex_gd->count; i++) {
689 0 : block += group_table_count[j];
690 0 : if (block == (&group_data[i].block_bitmap)[j]) {
691 0 : count += group_table_count[j];
692 0 : continue;
693 : }
694 0 : err = set_flexbg_block_bitmap(sb, handle,
695 : flex_gd,
696 0 : EXT4_B2C(sbi, start),
697 0 : EXT4_B2C(sbi,
698 : start + count
699 : - 1));
700 0 : if (err)
701 0 : goto out;
702 0 : count = group_table_count[j];
703 0 : start = (&group_data[i].block_bitmap)[j];
704 0 : block = start;
705 : }
706 :
707 0 : if (count) {
708 0 : err = set_flexbg_block_bitmap(sb, handle,
709 : flex_gd,
710 0 : EXT4_B2C(sbi, start),
711 0 : EXT4_B2C(sbi,
712 : start + count
713 : - 1));
714 0 : if (err)
715 0 : goto out;
716 : }
717 : }
718 :
719 0 : out:
720 0 : err2 = ext4_journal_stop(handle);
721 0 : if (err2 && !err)
722 0 : err = err2;
723 :
724 : return err;
725 : }
726 :
727 : /*
728 : * Iterate through the groups which hold BACKUP superblock/GDT copies in an
729 : * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before
730 : * calling this for the first time. In a sparse filesystem it will be the
731 : * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
732 : * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
733 : */
734 0 : unsigned int ext4_list_backups(struct super_block *sb, unsigned int *three,
735 : unsigned int *five, unsigned int *seven)
736 : {
737 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
738 0 : unsigned int *min = three;
739 0 : int mult = 3;
740 0 : unsigned int ret;
741 :
742 0 : if (ext4_has_feature_sparse_super2(sb)) {
743 0 : do {
744 0 : if (*min > 2)
745 : return UINT_MAX;
746 0 : ret = le32_to_cpu(es->s_backup_bgs[*min - 1]);
747 0 : *min += 1;
748 0 : } while (!ret);
749 0 : return ret;
750 : }
751 :
752 0 : if (!ext4_has_feature_sparse_super(sb)) {
753 0 : ret = *min;
754 0 : *min += 1;
755 0 : return ret;
756 : }
757 :
758 0 : if (*five < *min) {
759 0 : min = five;
760 0 : mult = 5;
761 : }
762 0 : if (*seven < *min) {
763 0 : min = seven;
764 0 : mult = 7;
765 : }
766 :
767 0 : ret = *min;
768 0 : *min *= mult;
769 :
770 0 : return ret;
771 : }
772 :
773 : /*
774 : * Check that all of the backup GDT blocks are held in the primary GDT block.
775 : * It is assumed that they are stored in group order. Returns the number of
776 : * groups in current filesystem that have BACKUPS, or -ve error code.
777 : */
778 0 : static int verify_reserved_gdb(struct super_block *sb,
779 : ext4_group_t end,
780 : struct buffer_head *primary)
781 : {
782 0 : const ext4_fsblk_t blk = primary->b_blocknr;
783 0 : unsigned three = 1;
784 0 : unsigned five = 5;
785 0 : unsigned seven = 7;
786 0 : unsigned grp;
787 0 : __le32 *p = (__le32 *)primary->b_data;
788 0 : int gdbackups = 0;
789 :
790 0 : while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
791 0 : if (le32_to_cpu(*p++) !=
792 0 : grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
793 0 : ext4_warning(sb, "reserved GDT %llu"
794 : " missing grp %d (%llu)",
795 : blk, grp,
796 : grp *
797 : (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
798 : blk);
799 0 : return -EINVAL;
800 : }
801 0 : if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
802 : return -EFBIG;
803 : }
804 :
805 : return gdbackups;
806 : }
807 :
808 : /*
809 : * Called when we need to bring a reserved group descriptor table block into
810 : * use from the resize inode. The primary copy of the new GDT block currently
811 : * is an indirect block (under the double indirect block in the resize inode).
812 : * The new backup GDT blocks will be stored as leaf blocks in this indirect
813 : * block, in group order. Even though we know all the block numbers we need,
814 : * we check to ensure that the resize inode has actually reserved these blocks.
815 : *
816 : * Don't need to update the block bitmaps because the blocks are still in use.
817 : *
818 : * We get all of the error cases out of the way, so that we are sure to not
819 : * fail once we start modifying the data on disk, because JBD has no rollback.
820 : */
821 0 : static int add_new_gdb(handle_t *handle, struct inode *inode,
822 : ext4_group_t group)
823 : {
824 0 : struct super_block *sb = inode->i_sb;
825 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
826 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
827 0 : ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
828 0 : struct buffer_head **o_group_desc, **n_group_desc = NULL;
829 0 : struct buffer_head *dind = NULL;
830 0 : struct buffer_head *gdb_bh = NULL;
831 0 : int gdbackups;
832 0 : struct ext4_iloc iloc = { .bh = NULL };
833 0 : __le32 *data;
834 0 : int err;
835 :
836 0 : if (test_opt(sb, DEBUG))
837 0 : printk(KERN_DEBUG
838 : "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
839 : gdb_num);
840 :
841 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
842 0 : if (IS_ERR(gdb_bh))
843 0 : return PTR_ERR(gdb_bh);
844 :
845 0 : gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
846 0 : if (gdbackups < 0) {
847 0 : err = gdbackups;
848 0 : goto errout;
849 : }
850 :
851 0 : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
852 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
853 0 : if (IS_ERR(dind)) {
854 0 : err = PTR_ERR(dind);
855 0 : dind = NULL;
856 0 : goto errout;
857 : }
858 :
859 0 : data = (__le32 *)dind->b_data;
860 0 : if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
861 0 : ext4_warning(sb, "new group %u GDT block %llu not reserved",
862 : group, gdblock);
863 0 : err = -EINVAL;
864 0 : goto errout;
865 : }
866 :
867 0 : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
868 0 : err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh,
869 : EXT4_JTR_NONE);
870 0 : if (unlikely(err))
871 0 : goto errout;
872 :
873 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
874 0 : err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE);
875 0 : if (unlikely(err))
876 0 : goto errout;
877 :
878 0 : BUFFER_TRACE(dind, "get_write_access");
879 0 : err = ext4_journal_get_write_access(handle, sb, dind, EXT4_JTR_NONE);
880 0 : if (unlikely(err)) {
881 0 : ext4_std_error(sb, err);
882 0 : goto errout;
883 : }
884 :
885 : /* ext4_reserve_inode_write() gets a reference on the iloc */
886 0 : err = ext4_reserve_inode_write(handle, inode, &iloc);
887 0 : if (unlikely(err))
888 0 : goto errout;
889 :
890 0 : n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *),
891 : GFP_KERNEL);
892 0 : if (!n_group_desc) {
893 0 : err = -ENOMEM;
894 0 : ext4_warning(sb, "not enough memory for %lu groups",
895 : gdb_num + 1);
896 0 : goto errout;
897 : }
898 :
899 : /*
900 : * Finally, we have all of the possible failures behind us...
901 : *
902 : * Remove new GDT block from inode double-indirect block and clear out
903 : * the new GDT block for use (which also "frees" the backup GDT blocks
904 : * from the reserved inode). We don't need to change the bitmaps for
905 : * these blocks, because they are marked as in-use from being in the
906 : * reserved inode, and will become GDT blocks (primary and backup).
907 : */
908 0 : data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
909 0 : err = ext4_handle_dirty_metadata(handle, NULL, dind);
910 0 : if (unlikely(err)) {
911 0 : ext4_std_error(sb, err);
912 0 : goto errout;
913 : }
914 0 : inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >>
915 0 : (9 - EXT4_SB(sb)->s_cluster_bits);
916 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
917 0 : memset(gdb_bh->b_data, 0, sb->s_blocksize);
918 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
919 0 : if (unlikely(err)) {
920 0 : ext4_std_error(sb, err);
921 0 : iloc.bh = NULL;
922 0 : goto errout;
923 : }
924 0 : brelse(dind);
925 :
926 0 : rcu_read_lock();
927 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
928 0 : memcpy(n_group_desc, o_group_desc,
929 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
930 0 : rcu_read_unlock();
931 0 : n_group_desc[gdb_num] = gdb_bh;
932 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
933 0 : EXT4_SB(sb)->s_gdb_count++;
934 0 : ext4_kvfree_array_rcu(o_group_desc);
935 :
936 0 : lock_buffer(EXT4_SB(sb)->s_sbh);
937 0 : le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
938 0 : ext4_superblock_csum_set(sb);
939 0 : unlock_buffer(EXT4_SB(sb)->s_sbh);
940 0 : err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
941 0 : if (err)
942 0 : ext4_std_error(sb, err);
943 : return err;
944 0 : errout:
945 0 : kvfree(n_group_desc);
946 0 : brelse(iloc.bh);
947 0 : brelse(dind);
948 0 : brelse(gdb_bh);
949 :
950 : ext4_debug("leaving with error %d\n", err);
951 : return err;
952 : }
953 :
954 : /*
955 : * add_new_gdb_meta_bg is the sister of add_new_gdb.
956 : */
957 0 : static int add_new_gdb_meta_bg(struct super_block *sb,
958 : handle_t *handle, ext4_group_t group) {
959 0 : ext4_fsblk_t gdblock;
960 0 : struct buffer_head *gdb_bh;
961 0 : struct buffer_head **o_group_desc, **n_group_desc;
962 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
963 0 : int err;
964 :
965 0 : gdblock = ext4_meta_bg_first_block_no(sb, group) +
966 0 : ext4_bg_has_super(sb, group);
967 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
968 0 : if (IS_ERR(gdb_bh))
969 0 : return PTR_ERR(gdb_bh);
970 0 : n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *),
971 : GFP_KERNEL);
972 0 : if (!n_group_desc) {
973 0 : brelse(gdb_bh);
974 0 : err = -ENOMEM;
975 0 : ext4_warning(sb, "not enough memory for %lu groups",
976 : gdb_num + 1);
977 0 : return err;
978 : }
979 :
980 0 : rcu_read_lock();
981 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
982 0 : memcpy(n_group_desc, o_group_desc,
983 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
984 0 : rcu_read_unlock();
985 0 : n_group_desc[gdb_num] = gdb_bh;
986 :
987 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
988 0 : err = ext4_journal_get_write_access(handle, sb, gdb_bh, EXT4_JTR_NONE);
989 0 : if (err) {
990 0 : kvfree(n_group_desc);
991 0 : brelse(gdb_bh);
992 0 : return err;
993 : }
994 :
995 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
996 0 : EXT4_SB(sb)->s_gdb_count++;
997 0 : ext4_kvfree_array_rcu(o_group_desc);
998 0 : return err;
999 : }
1000 :
1001 : /*
1002 : * Called when we are adding a new group which has a backup copy of each of
1003 : * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
1004 : * We need to add these reserved backup GDT blocks to the resize inode, so
1005 : * that they are kept for future resizing and not allocated to files.
1006 : *
1007 : * Each reserved backup GDT block will go into a different indirect block.
1008 : * The indirect blocks are actually the primary reserved GDT blocks,
1009 : * so we know in advance what their block numbers are. We only get the
1010 : * double-indirect block to verify it is pointing to the primary reserved
1011 : * GDT blocks so we don't overwrite a data block by accident. The reserved
1012 : * backup GDT blocks are stored in their reserved primary GDT block.
1013 : */
1014 0 : static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
1015 : ext4_group_t group)
1016 : {
1017 0 : struct super_block *sb = inode->i_sb;
1018 0 : int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
1019 0 : int cluster_bits = EXT4_SB(sb)->s_cluster_bits;
1020 0 : struct buffer_head **primary;
1021 0 : struct buffer_head *dind;
1022 0 : struct ext4_iloc iloc;
1023 0 : ext4_fsblk_t blk;
1024 0 : __le32 *data, *end;
1025 0 : int gdbackups = 0;
1026 0 : int res, i;
1027 0 : int err;
1028 :
1029 0 : primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS);
1030 0 : if (!primary)
1031 : return -ENOMEM;
1032 :
1033 0 : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
1034 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
1035 0 : if (IS_ERR(dind)) {
1036 0 : err = PTR_ERR(dind);
1037 0 : dind = NULL;
1038 0 : goto exit_free;
1039 : }
1040 :
1041 0 : blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
1042 0 : data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
1043 0 : EXT4_ADDR_PER_BLOCK(sb));
1044 0 : end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
1045 :
1046 : /* Get each reserved primary GDT block and verify it holds backups */
1047 0 : for (res = 0; res < reserved_gdb; res++, blk++) {
1048 0 : if (le32_to_cpu(*data) != blk) {
1049 0 : ext4_warning(sb, "reserved block %llu"
1050 : " not at offset %ld",
1051 : blk,
1052 : (long)(data - (__le32 *)dind->b_data));
1053 0 : err = -EINVAL;
1054 0 : goto exit_bh;
1055 : }
1056 0 : primary[res] = ext4_sb_bread(sb, blk, 0);
1057 0 : if (IS_ERR(primary[res])) {
1058 0 : err = PTR_ERR(primary[res]);
1059 0 : primary[res] = NULL;
1060 0 : goto exit_bh;
1061 : }
1062 0 : gdbackups = verify_reserved_gdb(sb, group, primary[res]);
1063 0 : if (gdbackups < 0) {
1064 0 : brelse(primary[res]);
1065 0 : err = gdbackups;
1066 0 : goto exit_bh;
1067 : }
1068 0 : if (++data >= end)
1069 0 : data = (__le32 *)dind->b_data;
1070 : }
1071 :
1072 0 : for (i = 0; i < reserved_gdb; i++) {
1073 0 : BUFFER_TRACE(primary[i], "get_write_access");
1074 0 : if ((err = ext4_journal_get_write_access(handle, sb, primary[i],
1075 : EXT4_JTR_NONE)))
1076 0 : goto exit_bh;
1077 : }
1078 :
1079 0 : if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
1080 0 : goto exit_bh;
1081 :
1082 : /*
1083 : * Finally we can add each of the reserved backup GDT blocks from
1084 : * the new group to its reserved primary GDT block.
1085 : */
1086 0 : blk = group * EXT4_BLOCKS_PER_GROUP(sb);
1087 0 : for (i = 0; i < reserved_gdb; i++) {
1088 0 : int err2;
1089 0 : data = (__le32 *)primary[i]->b_data;
1090 : /* printk("reserving backup %lu[%u] = %lu\n",
1091 : primary[i]->b_blocknr, gdbackups,
1092 : blk + primary[i]->b_blocknr); */
1093 0 : data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
1094 0 : err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1095 0 : if (!err)
1096 0 : err = err2;
1097 : }
1098 :
1099 0 : inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits);
1100 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
1101 :
1102 0 : exit_bh:
1103 0 : while (--res >= 0)
1104 0 : brelse(primary[res]);
1105 0 : brelse(dind);
1106 :
1107 0 : exit_free:
1108 0 : kfree(primary);
1109 :
1110 0 : return err;
1111 : }
1112 :
1113 0 : static inline void ext4_set_block_group_nr(struct super_block *sb, char *data,
1114 : ext4_group_t group)
1115 : {
1116 0 : struct ext4_super_block *es = (struct ext4_super_block *) data;
1117 :
1118 0 : es->s_block_group_nr = cpu_to_le16(group);
1119 0 : if (ext4_has_metadata_csum(sb))
1120 0 : es->s_checksum = ext4_superblock_csum(sb, es);
1121 0 : }
1122 :
1123 : /*
1124 : * Update the backup copies of the ext4 metadata. These don't need to be part
1125 : * of the main resize transaction, because e2fsck will re-write them if there
1126 : * is a problem (basically only OOM will cause a problem). However, we
1127 : * _should_ update the backups if possible, in case the primary gets trashed
1128 : * for some reason and we need to run e2fsck from a backup superblock. The
1129 : * important part is that the new block and inode counts are in the backup
1130 : * superblocks, and the location of the new group metadata in the GDT backups.
1131 : *
1132 : * We do not need take the s_resize_lock for this, because these
1133 : * blocks are not otherwise touched by the filesystem code when it is
1134 : * mounted. We don't need to worry about last changing from
1135 : * sbi->s_groups_count, because the worst that can happen is that we
1136 : * do not copy the full number of backups at this time. The resize
1137 : * which changed s_groups_count will backup again.
1138 : */
1139 0 : static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
1140 : int size, int meta_bg)
1141 : {
1142 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1143 0 : ext4_group_t last;
1144 0 : const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1145 0 : unsigned three = 1;
1146 0 : unsigned five = 5;
1147 0 : unsigned seven = 7;
1148 0 : ext4_group_t group = 0;
1149 0 : int rest = sb->s_blocksize - size;
1150 0 : handle_t *handle;
1151 0 : int err = 0, err2;
1152 :
1153 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1154 0 : if (IS_ERR(handle)) {
1155 0 : group = 1;
1156 0 : err = PTR_ERR(handle);
1157 0 : goto exit_err;
1158 : }
1159 :
1160 0 : if (meta_bg == 0) {
1161 0 : group = ext4_list_backups(sb, &three, &five, &seven);
1162 0 : last = sbi->s_groups_count;
1163 : } else {
1164 0 : group = ext4_get_group_number(sb, blk_off) + 1;
1165 0 : last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1166 : }
1167 :
1168 0 : while (group < sbi->s_groups_count) {
1169 0 : struct buffer_head *bh;
1170 0 : ext4_fsblk_t backup_block;
1171 0 : int has_super = ext4_bg_has_super(sb, group);
1172 0 : ext4_fsblk_t first_block = ext4_group_first_block_no(sb, group);
1173 :
1174 : /* Out of journal space, and can't get more - abort - so sad */
1175 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
1176 0 : if (err < 0)
1177 : break;
1178 :
1179 0 : if (meta_bg == 0)
1180 0 : backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
1181 : else
1182 0 : backup_block = first_block + has_super;
1183 :
1184 0 : bh = sb_getblk(sb, backup_block);
1185 0 : if (unlikely(!bh)) {
1186 : err = -ENOMEM;
1187 : break;
1188 : }
1189 0 : ext4_debug("update metadata backup %llu(+%llu)\n",
1190 : backup_block, backup_block -
1191 : ext4_group_first_block_no(sb, group));
1192 0 : BUFFER_TRACE(bh, "get_write_access");
1193 0 : if ((err = ext4_journal_get_write_access(handle, sb, bh,
1194 : EXT4_JTR_NONE)))
1195 : break;
1196 0 : lock_buffer(bh);
1197 0 : memcpy(bh->b_data, data, size);
1198 0 : if (rest)
1199 0 : memset(bh->b_data + size, 0, rest);
1200 0 : if (has_super && (backup_block == first_block))
1201 0 : ext4_set_block_group_nr(sb, bh->b_data, group);
1202 0 : set_buffer_uptodate(bh);
1203 0 : unlock_buffer(bh);
1204 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
1205 0 : if (unlikely(err))
1206 0 : ext4_std_error(sb, err);
1207 0 : brelse(bh);
1208 :
1209 0 : if (meta_bg == 0)
1210 0 : group = ext4_list_backups(sb, &three, &five, &seven);
1211 0 : else if (group == last)
1212 : break;
1213 : else
1214 : group = last;
1215 : }
1216 0 : if ((err2 = ext4_journal_stop(handle)) && !err)
1217 0 : err = err2;
1218 :
1219 : /*
1220 : * Ugh! Need to have e2fsck write the backup copies. It is too
1221 : * late to revert the resize, we shouldn't fail just because of
1222 : * the backup copies (they are only needed in case of corruption).
1223 : *
1224 : * However, if we got here we have a journal problem too, so we
1225 : * can't really start a transaction to mark the superblock.
1226 : * Chicken out and just set the flag on the hope it will be written
1227 : * to disk, and if not - we will simply wait until next fsck.
1228 : */
1229 0 : exit_err:
1230 0 : if (err) {
1231 0 : ext4_warning(sb, "can't update backup for group %u (err %d), "
1232 : "forcing fsck on next reboot", group, err);
1233 0 : sbi->s_mount_state &= ~EXT4_VALID_FS;
1234 0 : sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1235 0 : mark_buffer_dirty(sbi->s_sbh);
1236 : }
1237 0 : }
1238 :
1239 : /*
1240 : * ext4_add_new_descs() adds @count group descriptor of groups
1241 : * starting at @group
1242 : *
1243 : * @handle: journal handle
1244 : * @sb: super block
1245 : * @group: the group no. of the first group desc to be added
1246 : * @resize_inode: the resize inode
1247 : * @count: number of group descriptors to be added
1248 : */
1249 0 : static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1250 : ext4_group_t group, struct inode *resize_inode,
1251 : ext4_group_t count)
1252 : {
1253 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1254 0 : struct ext4_super_block *es = sbi->s_es;
1255 0 : struct buffer_head *gdb_bh;
1256 0 : int i, gdb_off, gdb_num, err = 0;
1257 0 : int meta_bg;
1258 :
1259 0 : meta_bg = ext4_has_feature_meta_bg(sb);
1260 0 : for (i = 0; i < count; i++, group++) {
1261 0 : int reserved_gdb = ext4_bg_has_super(sb, group) ?
1262 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1263 :
1264 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1265 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1266 :
1267 : /*
1268 : * We will only either add reserved group blocks to a backup group
1269 : * or remove reserved blocks for the first group in a new group block.
1270 : * Doing both would be mean more complex code, and sane people don't
1271 : * use non-sparse filesystems anymore. This is already checked above.
1272 : */
1273 0 : if (gdb_off) {
1274 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1275 : gdb_num);
1276 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
1277 0 : err = ext4_journal_get_write_access(handle, sb, gdb_bh,
1278 : EXT4_JTR_NONE);
1279 :
1280 0 : if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1281 0 : err = reserve_backup_gdb(handle, resize_inode, group);
1282 0 : } else if (meta_bg != 0) {
1283 0 : err = add_new_gdb_meta_bg(sb, handle, group);
1284 : } else {
1285 0 : err = add_new_gdb(handle, resize_inode, group);
1286 : }
1287 0 : if (err)
1288 : break;
1289 : }
1290 0 : return err;
1291 : }
1292 :
1293 0 : static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1294 : {
1295 0 : struct buffer_head *bh = sb_getblk(sb, block);
1296 0 : if (unlikely(!bh))
1297 : return NULL;
1298 0 : if (!bh_uptodate_or_lock(bh)) {
1299 0 : if (ext4_read_bh(bh, 0, NULL) < 0) {
1300 0 : brelse(bh);
1301 0 : return NULL;
1302 : }
1303 : }
1304 :
1305 : return bh;
1306 : }
1307 :
1308 0 : static int ext4_set_bitmap_checksums(struct super_block *sb,
1309 : struct ext4_group_desc *gdp,
1310 : struct ext4_new_group_data *group_data)
1311 : {
1312 0 : struct buffer_head *bh;
1313 :
1314 0 : if (!ext4_has_metadata_csum(sb))
1315 : return 0;
1316 :
1317 0 : bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1318 0 : if (!bh)
1319 : return -EIO;
1320 0 : ext4_inode_bitmap_csum_set(sb, gdp, bh,
1321 0 : EXT4_INODES_PER_GROUP(sb) / 8);
1322 0 : brelse(bh);
1323 :
1324 0 : bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1325 0 : if (!bh)
1326 : return -EIO;
1327 0 : ext4_block_bitmap_csum_set(sb, gdp, bh);
1328 0 : brelse(bh);
1329 :
1330 0 : return 0;
1331 : }
1332 :
1333 : /*
1334 : * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
1335 : */
1336 0 : static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1337 : struct ext4_new_flex_group_data *flex_gd)
1338 : {
1339 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1340 0 : struct ext4_group_desc *gdp;
1341 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1342 0 : struct buffer_head *gdb_bh;
1343 0 : ext4_group_t group;
1344 0 : __u16 *bg_flags = flex_gd->bg_flags;
1345 0 : int i, gdb_off, gdb_num, err = 0;
1346 :
1347 :
1348 0 : for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1349 0 : group = group_data->group;
1350 :
1351 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1352 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1353 :
1354 : /*
1355 : * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
1356 : */
1357 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num);
1358 : /* Update group descriptor block for new group */
1359 0 : gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1360 0 : gdb_off * EXT4_DESC_SIZE(sb));
1361 :
1362 0 : memset(gdp, 0, EXT4_DESC_SIZE(sb));
1363 0 : ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1364 0 : ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1365 0 : err = ext4_set_bitmap_checksums(sb, gdp, group_data);
1366 0 : if (err) {
1367 0 : ext4_std_error(sb, err);
1368 : break;
1369 : }
1370 :
1371 0 : ext4_inode_table_set(sb, gdp, group_data->inode_table);
1372 0 : ext4_free_group_clusters_set(sb, gdp,
1373 : group_data->free_clusters_count);
1374 0 : ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1375 0 : if (ext4_has_group_desc_csum(sb))
1376 0 : ext4_itable_unused_set(sb, gdp,
1377 0 : EXT4_INODES_PER_GROUP(sb));
1378 0 : gdp->bg_flags = cpu_to_le16(*bg_flags);
1379 0 : ext4_group_desc_csum_set(sb, group, gdp);
1380 :
1381 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1382 0 : if (unlikely(err)) {
1383 0 : ext4_std_error(sb, err);
1384 : break;
1385 : }
1386 :
1387 : /*
1388 : * We can allocate memory for mb_alloc based on the new group
1389 : * descriptor
1390 : */
1391 0 : err = ext4_mb_add_groupinfo(sb, group, gdp);
1392 0 : if (err)
1393 : break;
1394 : }
1395 0 : return err;
1396 : }
1397 :
1398 : static void ext4_add_overhead(struct super_block *sb,
1399 : const ext4_fsblk_t overhead)
1400 : {
1401 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1402 0 : struct ext4_super_block *es = sbi->s_es;
1403 :
1404 0 : sbi->s_overhead += overhead;
1405 0 : es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead);
1406 0 : smp_wmb();
1407 0 : }
1408 :
1409 : /*
1410 : * ext4_update_super() updates the super block so that the newly added
1411 : * groups can be seen by the filesystem.
1412 : *
1413 : * @sb: super block
1414 : * @flex_gd: new added groups
1415 : */
1416 0 : static void ext4_update_super(struct super_block *sb,
1417 : struct ext4_new_flex_group_data *flex_gd)
1418 : {
1419 0 : ext4_fsblk_t blocks_count = 0;
1420 0 : ext4_fsblk_t free_blocks = 0;
1421 0 : ext4_fsblk_t reserved_blocks = 0;
1422 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1423 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1424 0 : struct ext4_super_block *es = sbi->s_es;
1425 0 : int i;
1426 :
1427 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
1428 : /*
1429 : * Make the new blocks and inodes valid next. We do this before
1430 : * increasing the group count so that once the group is enabled,
1431 : * all of its blocks and inodes are already valid.
1432 : *
1433 : * We always allocate group-by-group, then block-by-block or
1434 : * inode-by-inode within a group, so enabling these
1435 : * blocks/inodes before the group is live won't actually let us
1436 : * allocate the new space yet.
1437 : */
1438 0 : for (i = 0; i < flex_gd->count; i++) {
1439 0 : blocks_count += group_data[i].blocks_count;
1440 0 : free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count);
1441 : }
1442 :
1443 0 : reserved_blocks = ext4_r_blocks_count(es) * 100;
1444 0 : reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1445 0 : reserved_blocks *= blocks_count;
1446 0 : do_div(reserved_blocks, 100);
1447 :
1448 0 : lock_buffer(sbi->s_sbh);
1449 0 : ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1450 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1451 0 : le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1452 0 : flex_gd->count);
1453 0 : le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1454 0 : flex_gd->count);
1455 :
1456 0 : ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1457 : /*
1458 : * We need to protect s_groups_count against other CPUs seeing
1459 : * inconsistent state in the superblock.
1460 : *
1461 : * The precise rules we use are:
1462 : *
1463 : * * Writers must perform a smp_wmb() after updating all
1464 : * dependent data and before modifying the groups count
1465 : *
1466 : * * Readers must perform an smp_rmb() after reading the groups
1467 : * count and before reading any dependent data.
1468 : *
1469 : * NB. These rules can be relaxed when checking the group count
1470 : * while freeing data, as we can only allocate from a block
1471 : * group after serialising against the group count, and we can
1472 : * only then free after serialising in turn against that
1473 : * allocation.
1474 : */
1475 0 : smp_wmb();
1476 :
1477 : /* Update the global fs size fields */
1478 0 : sbi->s_groups_count += flex_gd->count;
1479 0 : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1480 : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1481 :
1482 : /* Update the reserved block counts only once the new group is
1483 : * active. */
1484 0 : ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1485 : reserved_blocks);
1486 :
1487 : /* Update the free space counts */
1488 0 : percpu_counter_add(&sbi->s_freeclusters_counter,
1489 0 : EXT4_NUM_B2C(sbi, free_blocks));
1490 0 : percpu_counter_add(&sbi->s_freeinodes_counter,
1491 0 : EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1492 :
1493 0 : ext4_debug("free blocks count %llu",
1494 : percpu_counter_read(&sbi->s_freeclusters_counter));
1495 0 : if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) {
1496 0 : ext4_group_t flex_group;
1497 0 : struct flex_groups *fg;
1498 :
1499 0 : flex_group = ext4_flex_group(sbi, group_data[0].group);
1500 0 : fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
1501 0 : atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1502 : &fg->free_clusters);
1503 0 : atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1504 : &fg->free_inodes);
1505 : }
1506 :
1507 : /*
1508 : * Update the fs overhead information.
1509 : *
1510 : * For bigalloc, if the superblock already has a properly calculated
1511 : * overhead, update it with a value based on numbers already computed
1512 : * above for the newly allocated capacity.
1513 : */
1514 0 : if (ext4_has_feature_bigalloc(sb) && (sbi->s_overhead != 0))
1515 0 : ext4_add_overhead(sb,
1516 0 : EXT4_NUM_B2C(sbi, blocks_count - free_blocks));
1517 : else
1518 0 : ext4_calculate_overhead(sb);
1519 0 : es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead);
1520 :
1521 0 : ext4_superblock_csum_set(sb);
1522 0 : unlock_buffer(sbi->s_sbh);
1523 0 : if (test_opt(sb, DEBUG))
1524 0 : printk(KERN_DEBUG "EXT4-fs: added group %u:"
1525 : "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1526 : blocks_count, free_blocks, reserved_blocks);
1527 0 : }
1528 :
1529 : /* Add a flex group to an fs. Ensure we handle all possible error conditions
1530 : * _before_ we start modifying the filesystem, because we cannot abort the
1531 : * transaction and not have it write the data to disk.
1532 : */
1533 0 : static int ext4_flex_group_add(struct super_block *sb,
1534 : struct inode *resize_inode,
1535 : struct ext4_new_flex_group_data *flex_gd)
1536 : {
1537 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1538 0 : struct ext4_super_block *es = sbi->s_es;
1539 0 : ext4_fsblk_t o_blocks_count;
1540 0 : ext4_grpblk_t last;
1541 0 : ext4_group_t group;
1542 0 : handle_t *handle;
1543 0 : unsigned reserved_gdb;
1544 0 : int err = 0, err2 = 0, credit;
1545 :
1546 0 : BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
1547 :
1548 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1549 0 : o_blocks_count = ext4_blocks_count(es);
1550 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1551 0 : BUG_ON(last);
1552 :
1553 0 : err = setup_new_flex_group_blocks(sb, flex_gd);
1554 0 : if (err)
1555 0 : goto exit;
1556 : /*
1557 : * We will always be modifying at least the superblock and GDT
1558 : * blocks. If we are adding a group past the last current GDT block,
1559 : * we will also modify the inode and the dindirect block. If we
1560 : * are adding a group with superblock/GDT backups we will also
1561 : * modify each of the reserved GDT dindirect blocks.
1562 : */
1563 0 : credit = 3; /* sb, resize inode, resize inode dindirect */
1564 : /* GDT blocks */
1565 0 : credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
1566 0 : credit += reserved_gdb; /* Reserved GDT dindirect blocks */
1567 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1568 0 : if (IS_ERR(handle)) {
1569 0 : err = PTR_ERR(handle);
1570 0 : goto exit;
1571 : }
1572 :
1573 0 : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1574 0 : err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh,
1575 : EXT4_JTR_NONE);
1576 0 : if (err)
1577 0 : goto exit_journal;
1578 :
1579 0 : group = flex_gd->groups[0].group;
1580 0 : BUG_ON(group != sbi->s_groups_count);
1581 0 : err = ext4_add_new_descs(handle, sb, group,
1582 : resize_inode, flex_gd->count);
1583 0 : if (err)
1584 0 : goto exit_journal;
1585 :
1586 0 : err = ext4_setup_new_descs(handle, sb, flex_gd);
1587 0 : if (err)
1588 0 : goto exit_journal;
1589 :
1590 0 : ext4_update_super(sb, flex_gd);
1591 :
1592 0 : err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
1593 :
1594 0 : exit_journal:
1595 0 : err2 = ext4_journal_stop(handle);
1596 0 : if (!err)
1597 0 : err = err2;
1598 :
1599 0 : if (!err) {
1600 0 : int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1601 0 : int gdb_num_end = ((group + flex_gd->count - 1) /
1602 : EXT4_DESC_PER_BLOCK(sb));
1603 0 : int meta_bg = ext4_has_feature_meta_bg(sb);
1604 0 : sector_t old_gdb = 0;
1605 :
1606 0 : update_backups(sb, ext4_group_first_block_no(sb, 0),
1607 : (char *)es, sizeof(struct ext4_super_block), 0);
1608 0 : for (; gdb_num <= gdb_num_end; gdb_num++) {
1609 0 : struct buffer_head *gdb_bh;
1610 :
1611 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1612 : gdb_num);
1613 0 : if (old_gdb == gdb_bh->b_blocknr)
1614 0 : continue;
1615 0 : update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1616 0 : gdb_bh->b_size, meta_bg);
1617 0 : old_gdb = gdb_bh->b_blocknr;
1618 : }
1619 : }
1620 0 : exit:
1621 0 : return err;
1622 : }
1623 :
1624 0 : static int ext4_setup_next_flex_gd(struct super_block *sb,
1625 : struct ext4_new_flex_group_data *flex_gd,
1626 : ext4_fsblk_t n_blocks_count,
1627 : unsigned long flexbg_size)
1628 : {
1629 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1630 0 : struct ext4_super_block *es = sbi->s_es;
1631 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1632 0 : ext4_fsblk_t o_blocks_count;
1633 0 : ext4_group_t n_group;
1634 0 : ext4_group_t group;
1635 0 : ext4_group_t last_group;
1636 0 : ext4_grpblk_t last;
1637 0 : ext4_grpblk_t clusters_per_group;
1638 0 : unsigned long i;
1639 :
1640 0 : clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb);
1641 :
1642 0 : o_blocks_count = ext4_blocks_count(es);
1643 :
1644 0 : if (o_blocks_count == n_blocks_count)
1645 : return 0;
1646 :
1647 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1648 0 : BUG_ON(last);
1649 0 : ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1650 :
1651 0 : last_group = group | (flexbg_size - 1);
1652 0 : if (last_group > n_group)
1653 : last_group = n_group;
1654 :
1655 0 : flex_gd->count = last_group - group + 1;
1656 :
1657 0 : for (i = 0; i < flex_gd->count; i++) {
1658 0 : int overhead;
1659 :
1660 0 : group_data[i].group = group + i;
1661 0 : group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb);
1662 0 : overhead = ext4_group_overhead_blocks(sb, group + i);
1663 0 : group_data[i].mdata_blocks = overhead;
1664 0 : group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb);
1665 0 : if (ext4_has_group_desc_csum(sb)) {
1666 0 : flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1667 : EXT4_BG_INODE_UNINIT;
1668 0 : if (!test_opt(sb, INIT_INODE_TABLE))
1669 0 : flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1670 : } else
1671 0 : flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1672 : }
1673 :
1674 0 : if (last_group == n_group && ext4_has_group_desc_csum(sb))
1675 : /* We need to initialize block bitmap of last group. */
1676 0 : flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1677 :
1678 0 : if ((last_group == n_group) && (last != clusters_per_group - 1)) {
1679 0 : group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1);
1680 0 : group_data[i - 1].free_clusters_count -= clusters_per_group -
1681 : last - 1;
1682 : }
1683 :
1684 : return 1;
1685 : }
1686 :
1687 : /* Add group descriptor data to an existing or new group descriptor block.
1688 : * Ensure we handle all possible error conditions _before_ we start modifying
1689 : * the filesystem, because we cannot abort the transaction and not have it
1690 : * write the data to disk.
1691 : *
1692 : * If we are on a GDT block boundary, we need to get the reserved GDT block.
1693 : * Otherwise, we may need to add backup GDT blocks for a sparse group.
1694 : *
1695 : * We only need to hold the superblock lock while we are actually adding
1696 : * in the new group's counts to the superblock. Prior to that we have
1697 : * not really "added" the group at all. We re-check that we are still
1698 : * adding in the last group in case things have changed since verifying.
1699 : */
1700 0 : int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1701 : {
1702 0 : struct ext4_new_flex_group_data flex_gd;
1703 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1704 0 : struct ext4_super_block *es = sbi->s_es;
1705 0 : int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1706 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1707 0 : struct inode *inode = NULL;
1708 0 : int gdb_off;
1709 0 : int err;
1710 0 : __u16 bg_flags = 0;
1711 :
1712 0 : gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1713 :
1714 0 : if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) {
1715 0 : ext4_warning(sb, "Can't resize non-sparse filesystem further");
1716 0 : return -EPERM;
1717 : }
1718 :
1719 0 : if (ext4_blocks_count(es) + input->blocks_count <
1720 : ext4_blocks_count(es)) {
1721 0 : ext4_warning(sb, "blocks_count overflow");
1722 0 : return -EINVAL;
1723 : }
1724 :
1725 0 : if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1726 : le32_to_cpu(es->s_inodes_count)) {
1727 0 : ext4_warning(sb, "inodes_count overflow");
1728 0 : return -EINVAL;
1729 : }
1730 :
1731 0 : if (reserved_gdb || gdb_off == 0) {
1732 0 : if (!ext4_has_feature_resize_inode(sb) ||
1733 0 : !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1734 0 : ext4_warning(sb,
1735 : "No reserved GDT blocks, can't resize");
1736 0 : return -EPERM;
1737 : }
1738 0 : inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL);
1739 0 : if (IS_ERR(inode)) {
1740 0 : ext4_warning(sb, "Error opening resize inode");
1741 0 : return PTR_ERR(inode);
1742 : }
1743 : }
1744 :
1745 :
1746 0 : err = verify_group_input(sb, input);
1747 0 : if (err)
1748 0 : goto out;
1749 :
1750 0 : err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1751 0 : if (err)
1752 0 : goto out;
1753 :
1754 0 : err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1755 0 : if (err)
1756 0 : goto out;
1757 :
1758 0 : flex_gd.count = 1;
1759 0 : flex_gd.groups = input;
1760 0 : flex_gd.bg_flags = &bg_flags;
1761 0 : err = ext4_flex_group_add(sb, inode, &flex_gd);
1762 0 : out:
1763 0 : iput(inode);
1764 0 : return err;
1765 : } /* ext4_group_add */
1766 :
1767 : /*
1768 : * extend a group without checking assuming that checking has been done.
1769 : */
1770 0 : static int ext4_group_extend_no_check(struct super_block *sb,
1771 : ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1772 : {
1773 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1774 0 : handle_t *handle;
1775 0 : int err = 0, err2;
1776 :
1777 : /* We will update the superblock, one block bitmap, and
1778 : * one group descriptor via ext4_group_add_blocks().
1779 : */
1780 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1781 0 : if (IS_ERR(handle)) {
1782 0 : err = PTR_ERR(handle);
1783 0 : ext4_warning(sb, "error %d on journal start", err);
1784 0 : return err;
1785 : }
1786 :
1787 0 : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
1788 0 : err = ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh,
1789 : EXT4_JTR_NONE);
1790 0 : if (err) {
1791 0 : ext4_warning(sb, "error %d on journal write access", err);
1792 0 : goto errout;
1793 : }
1794 :
1795 0 : lock_buffer(EXT4_SB(sb)->s_sbh);
1796 0 : ext4_blocks_count_set(es, o_blocks_count + add);
1797 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1798 0 : ext4_superblock_csum_set(sb);
1799 0 : unlock_buffer(EXT4_SB(sb)->s_sbh);
1800 0 : ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1801 : o_blocks_count + add);
1802 : /* We add the blocks to the bitmap and set the group need init bit */
1803 0 : err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1804 0 : if (err)
1805 0 : goto errout;
1806 0 : ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
1807 0 : ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1808 : o_blocks_count + add);
1809 0 : errout:
1810 0 : err2 = ext4_journal_stop(handle);
1811 0 : if (err2 && !err)
1812 0 : err = err2;
1813 :
1814 0 : if (!err) {
1815 0 : if (test_opt(sb, DEBUG))
1816 0 : printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1817 : "blocks\n", ext4_blocks_count(es));
1818 0 : update_backups(sb, ext4_group_first_block_no(sb, 0),
1819 : (char *)es, sizeof(struct ext4_super_block), 0);
1820 : }
1821 : return err;
1822 : }
1823 :
1824 : /*
1825 : * Extend the filesystem to the new number of blocks specified. This entry
1826 : * point is only used to extend the current filesystem to the end of the last
1827 : * existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
1828 : * for emergencies (because it has no dependencies on reserved blocks).
1829 : *
1830 : * If we _really_ wanted, we could use default values to call ext4_group_add()
1831 : * allow the "remount" trick to work for arbitrary resizing, assuming enough
1832 : * GDT blocks are reserved to grow to the desired size.
1833 : */
1834 0 : int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1835 : ext4_fsblk_t n_blocks_count)
1836 : {
1837 0 : ext4_fsblk_t o_blocks_count;
1838 0 : ext4_grpblk_t last;
1839 0 : ext4_grpblk_t add;
1840 0 : struct buffer_head *bh;
1841 0 : ext4_group_t group;
1842 :
1843 0 : o_blocks_count = ext4_blocks_count(es);
1844 :
1845 0 : if (test_opt(sb, DEBUG))
1846 0 : ext4_msg(sb, KERN_DEBUG,
1847 : "extending last group from %llu to %llu blocks",
1848 : o_blocks_count, n_blocks_count);
1849 :
1850 0 : if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1851 : return 0;
1852 :
1853 0 : if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1854 0 : ext4_msg(sb, KERN_ERR,
1855 : "filesystem too large to resize to %llu blocks safely",
1856 : n_blocks_count);
1857 0 : return -EINVAL;
1858 : }
1859 :
1860 0 : if (n_blocks_count < o_blocks_count) {
1861 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1862 0 : return -EINVAL;
1863 : }
1864 :
1865 : /* Handle the remaining blocks in the last group only. */
1866 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1867 :
1868 0 : if (last == 0) {
1869 0 : ext4_warning(sb, "need to use ext2online to resize further");
1870 0 : return -EPERM;
1871 : }
1872 :
1873 0 : add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1874 :
1875 0 : if (o_blocks_count + add < o_blocks_count) {
1876 0 : ext4_warning(sb, "blocks_count overflow");
1877 0 : return -EINVAL;
1878 : }
1879 :
1880 0 : if (o_blocks_count + add > n_blocks_count)
1881 0 : add = n_blocks_count - o_blocks_count;
1882 :
1883 0 : if (o_blocks_count + add < n_blocks_count)
1884 0 : ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1885 : o_blocks_count + add, add);
1886 :
1887 : /* See if the device is actually as big as what was requested */
1888 0 : bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0);
1889 0 : if (IS_ERR(bh)) {
1890 0 : ext4_warning(sb, "can't read last block, resize aborted");
1891 0 : return -ENOSPC;
1892 : }
1893 0 : brelse(bh);
1894 :
1895 0 : return ext4_group_extend_no_check(sb, o_blocks_count, add);
1896 : } /* ext4_group_extend */
1897 :
1898 :
1899 : static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1900 : {
1901 0 : return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1902 : }
1903 :
1904 : /*
1905 : * Release the resize inode and drop the resize_inode feature if there
1906 : * are no more reserved gdt blocks, and then convert the file system
1907 : * to enable meta_bg
1908 : */
1909 0 : static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1910 : {
1911 0 : handle_t *handle;
1912 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1913 0 : struct ext4_super_block *es = sbi->s_es;
1914 0 : struct ext4_inode_info *ei = EXT4_I(inode);
1915 0 : ext4_fsblk_t nr;
1916 0 : int i, ret, err = 0;
1917 0 : int credits = 1;
1918 :
1919 0 : ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1920 0 : if (inode) {
1921 0 : if (es->s_reserved_gdt_blocks) {
1922 0 : ext4_error(sb, "Unexpected non-zero "
1923 : "s_reserved_gdt_blocks");
1924 0 : return -EPERM;
1925 : }
1926 :
1927 : /* Do a quick sanity check of the resize inode */
1928 0 : if (inode->i_blocks != 1 << (inode->i_blkbits -
1929 0 : (9 - sbi->s_cluster_bits)))
1930 0 : goto invalid_resize_inode;
1931 0 : for (i = 0; i < EXT4_N_BLOCKS; i++) {
1932 0 : if (i == EXT4_DIND_BLOCK) {
1933 0 : if (ei->i_data[i])
1934 0 : continue;
1935 : else
1936 0 : goto invalid_resize_inode;
1937 : }
1938 0 : if (ei->i_data[i])
1939 0 : goto invalid_resize_inode;
1940 : }
1941 : credits += 3; /* block bitmap, bg descriptor, resize inode */
1942 : }
1943 :
1944 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1945 0 : if (IS_ERR(handle))
1946 0 : return PTR_ERR(handle);
1947 :
1948 0 : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1949 0 : err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh,
1950 : EXT4_JTR_NONE);
1951 0 : if (err)
1952 0 : goto errout;
1953 :
1954 0 : lock_buffer(sbi->s_sbh);
1955 0 : ext4_clear_feature_resize_inode(sb);
1956 0 : ext4_set_feature_meta_bg(sb);
1957 0 : sbi->s_es->s_first_meta_bg =
1958 0 : cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1959 0 : ext4_superblock_csum_set(sb);
1960 0 : unlock_buffer(sbi->s_sbh);
1961 :
1962 0 : err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
1963 0 : if (err) {
1964 0 : ext4_std_error(sb, err);
1965 0 : goto errout;
1966 : }
1967 :
1968 0 : if (inode) {
1969 0 : nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1970 0 : ext4_free_blocks(handle, inode, NULL, nr, 1,
1971 : EXT4_FREE_BLOCKS_METADATA |
1972 : EXT4_FREE_BLOCKS_FORGET);
1973 0 : ei->i_data[EXT4_DIND_BLOCK] = 0;
1974 0 : inode->i_blocks = 0;
1975 :
1976 0 : err = ext4_mark_inode_dirty(handle, inode);
1977 0 : if (err)
1978 0 : ext4_std_error(sb, err);
1979 : }
1980 :
1981 0 : errout:
1982 0 : ret = ext4_journal_stop(handle);
1983 0 : if (!err)
1984 : err = ret;
1985 : return ret;
1986 :
1987 0 : invalid_resize_inode:
1988 0 : ext4_error(sb, "corrupted/inconsistent resize inode");
1989 0 : return -EINVAL;
1990 : }
1991 :
1992 : /*
1993 : * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1994 : *
1995 : * @sb: super block of the fs to be resized
1996 : * @n_blocks_count: the number of blocks resides in the resized fs
1997 : */
1998 0 : int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1999 : {
2000 0 : struct ext4_new_flex_group_data *flex_gd = NULL;
2001 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
2002 0 : struct ext4_super_block *es = sbi->s_es;
2003 0 : struct buffer_head *bh;
2004 0 : struct inode *resize_inode = NULL;
2005 0 : ext4_grpblk_t add, offset;
2006 0 : unsigned long n_desc_blocks;
2007 0 : unsigned long o_desc_blocks;
2008 0 : ext4_group_t o_group;
2009 0 : ext4_group_t n_group;
2010 0 : ext4_fsblk_t o_blocks_count;
2011 0 : ext4_fsblk_t n_blocks_count_retry = 0;
2012 0 : unsigned long last_update_time = 0;
2013 0 : int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
2014 0 : int meta_bg;
2015 :
2016 : /* See if the device is actually as big as what was requested */
2017 0 : bh = ext4_sb_bread(sb, n_blocks_count - 1, 0);
2018 0 : if (IS_ERR(bh)) {
2019 0 : ext4_warning(sb, "can't read last block, resize aborted");
2020 0 : return -ENOSPC;
2021 : }
2022 0 : brelse(bh);
2023 :
2024 : /*
2025 : * For bigalloc, trim the requested size to the nearest cluster
2026 : * boundary to avoid creating an unusable filesystem. We do this
2027 : * silently, instead of returning an error, to avoid breaking
2028 : * callers that blindly resize the filesystem to the full size of
2029 : * the underlying block device.
2030 : */
2031 0 : if (ext4_has_feature_bigalloc(sb))
2032 0 : n_blocks_count &= ~((1 << EXT4_CLUSTER_BITS(sb)) - 1);
2033 :
2034 0 : retry:
2035 0 : o_blocks_count = ext4_blocks_count(es);
2036 :
2037 0 : ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
2038 : "to %llu blocks", o_blocks_count, n_blocks_count);
2039 :
2040 0 : if (n_blocks_count < o_blocks_count) {
2041 : /* On-line shrinking not supported */
2042 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
2043 0 : return -EINVAL;
2044 : }
2045 :
2046 0 : if (n_blocks_count == o_blocks_count)
2047 : /* Nothing need to do */
2048 : return 0;
2049 :
2050 0 : n_group = ext4_get_group_number(sb, n_blocks_count - 1);
2051 0 : if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
2052 0 : ext4_warning(sb, "resize would cause inodes_count overflow");
2053 0 : return -EINVAL;
2054 : }
2055 0 : ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
2056 :
2057 0 : n_desc_blocks = num_desc_blocks(sb, n_group + 1);
2058 0 : o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
2059 :
2060 0 : meta_bg = ext4_has_feature_meta_bg(sb);
2061 :
2062 0 : if (ext4_has_feature_resize_inode(sb)) {
2063 0 : if (meta_bg) {
2064 0 : ext4_error(sb, "resize_inode and meta_bg enabled "
2065 : "simultaneously");
2066 0 : return -EINVAL;
2067 : }
2068 0 : if (n_desc_blocks > o_desc_blocks +
2069 0 : le16_to_cpu(es->s_reserved_gdt_blocks)) {
2070 0 : n_blocks_count_retry = n_blocks_count;
2071 0 : n_desc_blocks = o_desc_blocks +
2072 : le16_to_cpu(es->s_reserved_gdt_blocks);
2073 0 : n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
2074 0 : n_blocks_count = (ext4_fsblk_t)n_group *
2075 0 : EXT4_BLOCKS_PER_GROUP(sb) +
2076 0 : le32_to_cpu(es->s_first_data_block);
2077 0 : n_group--; /* set to last group number */
2078 : }
2079 :
2080 0 : if (!resize_inode)
2081 0 : resize_inode = ext4_iget(sb, EXT4_RESIZE_INO,
2082 : EXT4_IGET_SPECIAL);
2083 0 : if (IS_ERR(resize_inode)) {
2084 0 : ext4_warning(sb, "Error opening resize inode");
2085 0 : return PTR_ERR(resize_inode);
2086 : }
2087 : }
2088 :
2089 0 : if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
2090 0 : err = ext4_convert_meta_bg(sb, resize_inode);
2091 0 : if (err)
2092 0 : goto out;
2093 0 : if (resize_inode) {
2094 0 : iput(resize_inode);
2095 0 : resize_inode = NULL;
2096 : }
2097 0 : if (n_blocks_count_retry) {
2098 0 : n_blocks_count = n_blocks_count_retry;
2099 0 : n_blocks_count_retry = 0;
2100 0 : goto retry;
2101 : }
2102 : }
2103 :
2104 : /*
2105 : * Make sure the last group has enough space so that it's
2106 : * guaranteed to have enough space for all metadata blocks
2107 : * that it might need to hold. (We might not need to store
2108 : * the inode table blocks in the last block group, but there
2109 : * will be cases where this might be needed.)
2110 : */
2111 0 : if ((ext4_group_first_block_no(sb, n_group) +
2112 0 : ext4_group_overhead_blocks(sb, n_group) + 2 +
2113 0 : sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) {
2114 0 : n_blocks_count = ext4_group_first_block_no(sb, n_group);
2115 0 : n_group--;
2116 0 : n_blocks_count_retry = 0;
2117 0 : if (resize_inode) {
2118 0 : iput(resize_inode);
2119 0 : resize_inode = NULL;
2120 : }
2121 0 : goto retry;
2122 : }
2123 :
2124 : /* extend the last group */
2125 0 : if (n_group == o_group)
2126 0 : add = n_blocks_count - o_blocks_count;
2127 : else
2128 0 : add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1));
2129 0 : if (add > 0) {
2130 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
2131 0 : if (err)
2132 0 : goto out;
2133 : }
2134 :
2135 0 : if (ext4_blocks_count(es) == n_blocks_count && n_blocks_count_retry == 0)
2136 0 : goto out;
2137 :
2138 0 : err = ext4_alloc_flex_bg_array(sb, n_group + 1);
2139 0 : if (err)
2140 0 : goto out;
2141 :
2142 0 : err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
2143 0 : if (err)
2144 0 : goto out;
2145 :
2146 0 : flex_gd = alloc_flex_gd(flexbg_size);
2147 0 : if (flex_gd == NULL) {
2148 0 : err = -ENOMEM;
2149 0 : goto out;
2150 : }
2151 :
2152 : /* Add flex groups. Note that a regular group is a
2153 : * flex group with 1 group.
2154 : */
2155 0 : while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
2156 : flexbg_size)) {
2157 0 : if (time_is_before_jiffies(last_update_time + HZ * 10)) {
2158 0 : if (last_update_time)
2159 0 : ext4_msg(sb, KERN_INFO,
2160 : "resized to %llu blocks",
2161 : ext4_blocks_count(es));
2162 0 : last_update_time = jiffies;
2163 : }
2164 0 : if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
2165 : break;
2166 0 : err = ext4_flex_group_add(sb, resize_inode, flex_gd);
2167 0 : if (unlikely(err))
2168 : break;
2169 : }
2170 :
2171 0 : if (!err && n_blocks_count_retry) {
2172 0 : n_blocks_count = n_blocks_count_retry;
2173 0 : n_blocks_count_retry = 0;
2174 0 : free_flex_gd(flex_gd);
2175 0 : flex_gd = NULL;
2176 0 : if (resize_inode) {
2177 0 : iput(resize_inode);
2178 0 : resize_inode = NULL;
2179 : }
2180 0 : goto retry;
2181 : }
2182 :
2183 0 : out:
2184 0 : if (flex_gd)
2185 0 : free_flex_gd(flex_gd);
2186 0 : if (resize_inode != NULL)
2187 0 : iput(resize_inode);
2188 0 : if (err)
2189 0 : ext4_warning(sb, "error (%d) occurred during "
2190 : "file system resize", err);
2191 0 : ext4_msg(sb, KERN_INFO, "resized filesystem to %llu",
2192 : ext4_blocks_count(es));
2193 0 : return err;
2194 : }
|
