Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/resize.c |
ac27a0ec | 4 | * |
617ba13b | 5 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
6 | * |
7 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
8 | * | |
9 | * This could probably be made into a module, because it is not often in use. | |
10 | */ | |
11 | ||
12 | ||
617ba13b | 13 | #define EXT4FS_DEBUG |
ac27a0ec | 14 | |
ac27a0ec DK |
15 | #include <linux/errno.h> |
16 | #include <linux/slab.h> | |
17 | ||
3dcf5451 | 18 | #include "ext4_jbd2.h" |
ac27a0ec | 19 | |
1d0c3924 TT |
20 | struct ext4_rcu_ptr { |
21 | struct rcu_head rcu; | |
22 | void *ptr; | |
23 | }; | |
24 | ||
25 | static void ext4_rcu_ptr_callback(struct rcu_head *head) | |
26 | { | |
27 | struct ext4_rcu_ptr *ptr; | |
28 | ||
29 | ptr = container_of(head, struct ext4_rcu_ptr, rcu); | |
30 | kvfree(ptr->ptr); | |
31 | kfree(ptr); | |
32 | } | |
33 | ||
34 | void ext4_kvfree_array_rcu(void *to_free) | |
35 | { | |
36 | struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
37 | ||
38 | if (ptr) { | |
39 | ptr->ptr = to_free; | |
40 | call_rcu(&ptr->rcu, ext4_rcu_ptr_callback); | |
41 | return; | |
42 | } | |
43 | synchronize_rcu(); | |
44 | kvfree(to_free); | |
45 | } | |
46 | ||
8f82f840 YY |
47 | int ext4_resize_begin(struct super_block *sb) |
48 | { | |
5f8c1093 | 49 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
8f82f840 YY |
50 | int ret = 0; |
51 | ||
52 | if (!capable(CAP_SYS_RESOURCE)) | |
53 | return -EPERM; | |
54 | ||
011fa994 TT |
55 | /* |
56 | * If we are not using the primary superblock/GDT copy don't resize, | |
57 | * because the user tools have no way of handling this. Probably a | |
58 | * bad time to do it anyways. | |
59 | */ | |
5f8c1093 | 60 | if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != |
011fa994 TT |
61 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { |
62 | ext4_warning(sb, "won't resize using backup superblock at %llu", | |
63 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); | |
64 | return -EPERM; | |
65 | } | |
66 | ||
ce723c31 YY |
67 | /* |
68 | * We are not allowed to do online-resizing on a filesystem mounted | |
69 | * with error, because it can destroy the filesystem easily. | |
70 | */ | |
71 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
72 | ext4_warning(sb, "There are errors in the filesystem, " | |
8d2ae1cb | 73 | "so online resizing is not allowed"); |
ce723c31 YY |
74 | return -EPERM; |
75 | } | |
76 | ||
b1489186 JT |
77 | if (ext4_has_feature_sparse_super2(sb)) { |
78 | ext4_msg(sb, KERN_ERR, "Online resizing not supported with sparse_super2"); | |
79 | return -EOPNOTSUPP; | |
80 | } | |
e9f9f61d | 81 | |
9549a168 TT |
82 | if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, |
83 | &EXT4_SB(sb)->s_ext4_flags)) | |
8f82f840 YY |
84 | ret = -EBUSY; |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
89 | void ext4_resize_end(struct super_block *sb) | |
90 | { | |
9549a168 | 91 | clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); |
4e857c58 | 92 | smp_mb__after_atomic(); |
8f82f840 YY |
93 | } |
94 | ||
01f795f9 YY |
95 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
96 | ext4_group_t group) { | |
97 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
98 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
99 | } | |
100 | ||
101 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
102 | ext4_group_t group) { | |
103 | group = ext4_meta_bg_first_group(sb, group); | |
104 | return ext4_group_first_block_no(sb, group); | |
105 | } | |
106 | ||
107 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
108 | ext4_group_t group) { | |
109 | ext4_grpblk_t overhead; | |
110 | overhead = ext4_bg_num_gdb(sb, group); | |
111 | if (ext4_bg_has_super(sb, group)) | |
112 | overhead += 1 + | |
113 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
114 | return overhead; | |
115 | } | |
116 | ||
ac27a0ec DK |
117 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
118 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
119 | ||
120 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 121 | struct ext4_new_group_data *input) |
ac27a0ec | 122 | { |
617ba13b MC |
123 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
124 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 125 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 126 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 127 | ext4_group_t group = input->group; |
617ba13b | 128 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
b302ef2d TT |
129 | unsigned overhead; |
130 | ext4_fsblk_t metaend; | |
ac27a0ec | 131 | struct buffer_head *bh = NULL; |
3a5b2ecd | 132 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
133 | int err = -EINVAL; |
134 | ||
b302ef2d TT |
135 | if (group != sbi->s_groups_count) { |
136 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", | |
137 | input->group, sbi->s_groups_count); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | overhead = ext4_group_overhead_blocks(sb, group); | |
142 | metaend = start + overhead; | |
d77147ff | 143 | input->free_clusters_count = free_blocks_count = |
ac27a0ec DK |
144 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
145 | ||
146 | if (test_opt(sb, DEBUG)) | |
617ba13b | 147 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 148 | "(%d free, %u reserved)\n", |
617ba13b | 149 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
150 | "no-super", input->group, input->blocks_count, |
151 | free_blocks_count, input->reserved_blocks); | |
152 | ||
3a5b2ecd | 153 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
b302ef2d | 154 | if (offset != 0) |
12062ddd | 155 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 156 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 157 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
158 | input->reserved_blocks); |
159 | else if (free_blocks_count < 0) | |
12062ddd | 160 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec | 161 | input->blocks_count); |
fb265c9c TT |
162 | else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { |
163 | err = PTR_ERR(bh); | |
164 | bh = NULL; | |
12062ddd | 165 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec | 166 | end - 1); |
fb265c9c | 167 | } else if (outside(input->block_bitmap, start, end)) |
12062ddd | 168 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 169 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 170 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 171 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 172 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 173 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 174 | outside(itend - 1, start, end)) |
12062ddd | 175 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 176 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 177 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 178 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 179 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 180 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
181 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
182 | "(%llu-%llu)", | |
1939e49a RD |
183 | (unsigned long long)input->block_bitmap, |
184 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 185 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
186 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
187 | "(%llu-%llu)", | |
1939e49a RD |
188 | (unsigned long long)input->inode_bitmap, |
189 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 190 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 191 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
192 | (unsigned long long)input->block_bitmap, |
193 | start, metaend - 1); | |
ac27a0ec | 194 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 195 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
196 | (unsigned long long)input->inode_bitmap, |
197 | start, metaend - 1); | |
ac27a0ec | 198 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 199 | inside(itend - 1, start, metaend)) |
12062ddd ES |
200 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
201 | "(%llu-%llu)", | |
1939e49a RD |
202 | (unsigned long long)input->inode_table, |
203 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
204 | else |
205 | err = 0; | |
206 | brelse(bh); | |
207 | ||
208 | return err; | |
209 | } | |
210 | ||
28c7bac0 YY |
211 | /* |
212 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
213 | * group each time. | |
214 | */ | |
215 | struct ext4_new_flex_group_data { | |
216 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
217 | in the flex group */ | |
218 | __u16 *bg_flags; /* block group flags of groups | |
219 | in @groups */ | |
220 | ext4_group_t count; /* number of groups in @groups | |
221 | */ | |
222 | }; | |
223 | ||
224 | /* | |
225 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
226 | * @flexbg_size. | |
227 | * | |
228 | * Returns NULL on failure otherwise address of the allocated structure. | |
229 | */ | |
230 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
231 | { | |
232 | struct ext4_new_flex_group_data *flex_gd; | |
233 | ||
234 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
235 | if (flex_gd == NULL) | |
236 | goto out3; | |
237 | ||
46901760 | 238 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) |
967ac8af | 239 | goto out2; |
28c7bac0 YY |
240 | flex_gd->count = flexbg_size; |
241 | ||
6da2ec56 KC |
242 | flex_gd->groups = kmalloc_array(flexbg_size, |
243 | sizeof(struct ext4_new_group_data), | |
244 | GFP_NOFS); | |
28c7bac0 YY |
245 | if (flex_gd->groups == NULL) |
246 | goto out2; | |
247 | ||
6da2ec56 KC |
248 | flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16), |
249 | GFP_NOFS); | |
28c7bac0 YY |
250 | if (flex_gd->bg_flags == NULL) |
251 | goto out1; | |
252 | ||
253 | return flex_gd; | |
254 | ||
255 | out1: | |
256 | kfree(flex_gd->groups); | |
257 | out2: | |
258 | kfree(flex_gd); | |
259 | out3: | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
264 | { | |
265 | kfree(flex_gd->bg_flags); | |
266 | kfree(flex_gd->groups); | |
267 | kfree(flex_gd); | |
268 | } | |
269 | ||
3fbea4b3 YY |
270 | /* |
271 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
272 | * and inode tables for a flex group. | |
273 | * | |
274 | * This function is used by 64bit-resize. Note that this function allocates | |
275 | * group tables from the 1st group of groups contained by @flexgd, which may | |
276 | * be a partial of a flex group. | |
277 | * | |
278 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
279 | * |
280 | * Returns 0 on a successful allocation of the metadata blocks in the | |
281 | * block group. | |
3fbea4b3 | 282 | */ |
03c1c290 | 283 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
284 | struct ext4_new_flex_group_data *flex_gd, |
285 | int flexbg_size) | |
286 | { | |
287 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
288 | ext4_fsblk_t start_blk; |
289 | ext4_fsblk_t last_blk; | |
290 | ext4_group_t src_group; | |
291 | ext4_group_t bb_index = 0; | |
292 | ext4_group_t ib_index = 0; | |
293 | ext4_group_t it_index = 0; | |
294 | ext4_group_t group; | |
295 | ext4_group_t last_group; | |
296 | unsigned overhead; | |
b93c9535 | 297 | __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; |
d77147ff | 298 | int i; |
3fbea4b3 YY |
299 | |
300 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
301 | ||
302 | src_group = group_data[0].group; | |
303 | last_group = src_group + flex_gd->count - 1; | |
304 | ||
305 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
306 | (last_group & ~(flexbg_size - 1)))); | |
307 | next_group: | |
308 | group = group_data[0].group; | |
03c1c290 YY |
309 | if (src_group >= group_data[0].group + flex_gd->count) |
310 | return -ENOSPC; | |
3fbea4b3 YY |
311 | start_blk = ext4_group_first_block_no(sb, src_group); |
312 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
313 | ||
01f795f9 | 314 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
315 | |
316 | start_blk += overhead; | |
317 | ||
3fbea4b3 YY |
318 | /* We collect contiguous blocks as much as possible. */ |
319 | src_group++; | |
01f795f9 YY |
320 | for (; src_group <= last_group; src_group++) { |
321 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
b93c9535 | 322 | if (overhead == 0) |
3fbea4b3 YY |
323 | last_blk += group_data[src_group - group].blocks_count; |
324 | else | |
325 | break; | |
01f795f9 | 326 | } |
3fbea4b3 YY |
327 | |
328 | /* Allocate block bitmaps */ | |
329 | for (; bb_index < flex_gd->count; bb_index++) { | |
330 | if (start_blk >= last_blk) | |
331 | goto next_group; | |
332 | group_data[bb_index].block_bitmap = start_blk++; | |
bd86298e | 333 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 334 | group -= group_data[0].group; |
d77147ff | 335 | group_data[group].mdata_blocks++; |
b93c9535 | 336 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
337 | } |
338 | ||
339 | /* Allocate inode bitmaps */ | |
340 | for (; ib_index < flex_gd->count; ib_index++) { | |
341 | if (start_blk >= last_blk) | |
342 | goto next_group; | |
343 | group_data[ib_index].inode_bitmap = start_blk++; | |
bd86298e | 344 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 345 | group -= group_data[0].group; |
d77147ff | 346 | group_data[group].mdata_blocks++; |
b93c9535 | 347 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
348 | } |
349 | ||
350 | /* Allocate inode tables */ | |
351 | for (; it_index < flex_gd->count; it_index++) { | |
b93c9535 TT |
352 | unsigned int itb = EXT4_SB(sb)->s_itb_per_group; |
353 | ext4_fsblk_t next_group_start; | |
354 | ||
355 | if (start_blk + itb > last_blk) | |
3fbea4b3 YY |
356 | goto next_group; |
357 | group_data[it_index].inode_table = start_blk; | |
b93c9535 TT |
358 | group = ext4_get_group_number(sb, start_blk); |
359 | next_group_start = ext4_group_first_block_no(sb, group + 1); | |
3fbea4b3 | 360 | group -= group_data[0].group; |
3fbea4b3 | 361 | |
b93c9535 TT |
362 | if (start_blk + itb > next_group_start) { |
363 | flex_gd->bg_flags[group + 1] &= uninit_mask; | |
364 | overhead = start_blk + itb - next_group_start; | |
d77147ff | 365 | group_data[group + 1].mdata_blocks += overhead; |
b93c9535 TT |
366 | itb -= overhead; |
367 | } | |
368 | ||
d77147ff | 369 | group_data[group].mdata_blocks += itb; |
b93c9535 | 370 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
371 | start_blk += EXT4_SB(sb)->s_itb_per_group; |
372 | } | |
373 | ||
d77147ff | 374 | /* Update free clusters count to exclude metadata blocks */ |
375 | for (i = 0; i < flex_gd->count; i++) { | |
376 | group_data[i].free_clusters_count -= | |
377 | EXT4_NUM_B2C(EXT4_SB(sb), | |
378 | group_data[i].mdata_blocks); | |
379 | } | |
380 | ||
3fbea4b3 YY |
381 | if (test_opt(sb, DEBUG)) { |
382 | int i; | |
383 | group = group_data[0].group; | |
384 | ||
385 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
386 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
387 | flexbg_size); | |
388 | ||
389 | for (i = 0; i < flex_gd->count; i++) { | |
d77147ff | 390 | ext4_debug( |
391 | "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", | |
3fbea4b3 YY |
392 | ext4_bg_has_super(sb, group + i) ? "normal" : |
393 | "no-super", group + i, | |
394 | group_data[i].blocks_count, | |
d77147ff | 395 | group_data[i].free_clusters_count, |
396 | group_data[i].mdata_blocks); | |
3fbea4b3 YY |
397 | } |
398 | } | |
03c1c290 | 399 | return 0; |
3fbea4b3 YY |
400 | } |
401 | ||
ac27a0ec | 402 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 403 | ext4_fsblk_t blk) |
ac27a0ec DK |
404 | { |
405 | struct buffer_head *bh; | |
406 | int err; | |
407 | ||
408 | bh = sb_getblk(sb, blk); | |
aebf0243 | 409 | if (unlikely(!bh)) |
860d21e2 | 410 | return ERR_PTR(-ENOMEM); |
5d601255 | 411 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 412 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
413 | brelse(bh); |
414 | bh = ERR_PTR(err); | |
415 | } else { | |
ac27a0ec DK |
416 | memset(bh->b_data, 0, sb->s_blocksize); |
417 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
418 | } |
419 | ||
420 | return bh; | |
421 | } | |
422 | ||
83448bdf JK |
423 | static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits) |
424 | { | |
425 | return ext4_journal_ensure_credits_fn(handle, credits, | |
426 | EXT4_MAX_TRANS_DATA, 0, 0); | |
427 | } | |
428 | ||
33afdcc5 | 429 | /* |
d77147ff | 430 | * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. |
33afdcc5 YY |
431 | * |
432 | * Helper function for ext4_setup_new_group_blocks() which set . | |
433 | * | |
434 | * @sb: super block | |
435 | * @handle: journal handle | |
436 | * @flex_gd: flex group data | |
437 | */ | |
438 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
439 | struct ext4_new_flex_group_data *flex_gd, | |
d77147ff | 440 | ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) |
33afdcc5 | 441 | { |
d77147ff | 442 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
443 | ext4_group_t count = last_cluster - first_cluster + 1; | |
33afdcc5 YY |
444 | ext4_group_t count2; |
445 | ||
d77147ff | 446 | ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, |
447 | last_cluster); | |
448 | for (count2 = count; count > 0; | |
449 | count -= count2, first_cluster += count2) { | |
33afdcc5 YY |
450 | ext4_fsblk_t start; |
451 | struct buffer_head *bh; | |
452 | ext4_group_t group; | |
453 | int err; | |
454 | ||
d77147ff | 455 | group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); |
456 | start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); | |
33afdcc5 YY |
457 | group -= flex_gd->groups[0].group; |
458 | ||
d77147ff | 459 | count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); |
33afdcc5 YY |
460 | if (count2 > count) |
461 | count2 = count; | |
462 | ||
463 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
464 | BUG_ON(flex_gd->count > 1); | |
465 | continue; | |
466 | } | |
467 | ||
83448bdf | 468 | err = ext4_resize_ensure_credits_batch(handle, 1); |
a4130367 | 469 | if (err < 0) |
33afdcc5 YY |
470 | return err; |
471 | ||
472 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 473 | if (unlikely(!bh)) |
860d21e2 | 474 | return -ENOMEM; |
33afdcc5 | 475 | |
5d601255 | 476 | BUFFER_TRACE(bh, "get_write_access"); |
33afdcc5 | 477 | err = ext4_journal_get_write_access(handle, bh); |
cea57941 VA |
478 | if (err) { |
479 | brelse(bh); | |
33afdcc5 | 480 | return err; |
cea57941 | 481 | } |
d77147ff | 482 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", |
483 | first_cluster, first_cluster - start, count2); | |
484 | ext4_set_bits(bh->b_data, first_cluster - start, count2); | |
33afdcc5 YY |
485 | |
486 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
cea57941 | 487 | brelse(bh); |
33afdcc5 YY |
488 | if (unlikely(err)) |
489 | return err; | |
33afdcc5 YY |
490 | } |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
497 | * This doesn't need to be part of the main transaction, since we are only | |
498 | * changing blocks outside the actual filesystem. We still do journaling to | |
499 | * ensure the recovery is correct in case of a failure just after resize. | |
500 | * If any part of this fails, we simply abort the resize. | |
501 | * | |
502 | * setup_new_flex_group_blocks handles a flex group as follow: | |
503 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
504 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
505 | * super block and GDT. | |
506 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
507 | * bitmap for blocks taken by group tables. | |
508 | */ | |
509 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
510 | struct ext4_new_flex_group_data *flex_gd) | |
511 | { | |
512 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
513 | ext4_fsblk_t start; | |
514 | ext4_fsblk_t block; | |
515 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
516 | struct ext4_super_block *es = sbi->s_es; | |
517 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
518 | __u16 *bg_flags = flex_gd->bg_flags; | |
519 | handle_t *handle; | |
520 | ext4_group_t group, count; | |
521 | struct buffer_head *bh = NULL; | |
522 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 523 | int meta_bg; |
33afdcc5 YY |
524 | |
525 | BUG_ON(!flex_gd->count || !group_data || | |
526 | group_data[0].group != sbi->s_groups_count); | |
527 | ||
528 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
e2b911c5 | 529 | meta_bg = ext4_has_feature_meta_bg(sb); |
33afdcc5 YY |
530 | |
531 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 532 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
533 | if (IS_ERR(handle)) |
534 | return PTR_ERR(handle); | |
535 | ||
536 | group = group_data[0].group; | |
537 | for (i = 0; i < flex_gd->count; i++, group++) { | |
538 | unsigned long gdblocks; | |
01f795f9 | 539 | ext4_grpblk_t overhead; |
33afdcc5 YY |
540 | |
541 | gdblocks = ext4_bg_num_gdb(sb, group); | |
542 | start = ext4_group_first_block_no(sb, group); | |
543 | ||
01f795f9 | 544 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
545 | goto handle_itb; |
546 | ||
01f795f9 YY |
547 | if (meta_bg == 1) { |
548 | ext4_group_t first_group; | |
549 | first_group = ext4_meta_bg_first_group(sb, group); | |
550 | if (first_group != group + 1 && | |
551 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
552 | goto handle_itb; | |
553 | } | |
554 | ||
555 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 556 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 557 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
558 | struct buffer_head *gdb; |
559 | ||
560 | ext4_debug("update backup group %#04llx\n", block); | |
83448bdf | 561 | err = ext4_resize_ensure_credits_batch(handle, 1); |
a4130367 | 562 | if (err < 0) |
33afdcc5 YY |
563 | goto out; |
564 | ||
565 | gdb = sb_getblk(sb, block); | |
aebf0243 | 566 | if (unlikely(!gdb)) { |
860d21e2 | 567 | err = -ENOMEM; |
33afdcc5 YY |
568 | goto out; |
569 | } | |
570 | ||
5d601255 | 571 | BUFFER_TRACE(gdb, "get_write_access"); |
33afdcc5 YY |
572 | err = ext4_journal_get_write_access(handle, gdb); |
573 | if (err) { | |
574 | brelse(gdb); | |
575 | goto out; | |
576 | } | |
1d0c3924 TT |
577 | memcpy(gdb->b_data, sbi_array_rcu_deref(sbi, |
578 | s_group_desc, j)->b_data, gdb->b_size); | |
33afdcc5 YY |
579 | set_buffer_uptodate(gdb); |
580 | ||
581 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
582 | if (unlikely(err)) { | |
583 | brelse(gdb); | |
584 | goto out; | |
585 | } | |
586 | brelse(gdb); | |
587 | } | |
588 | ||
589 | /* Zero out all of the reserved backup group descriptor | |
590 | * table blocks | |
591 | */ | |
592 | if (ext4_bg_has_super(sb, group)) { | |
593 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
594 | reserved_gdb, GFP_NOFS); | |
595 | if (err) | |
596 | goto out; | |
597 | } | |
598 | ||
6df935ad | 599 | handle_itb: |
33afdcc5 YY |
600 | /* Initialize group tables of the grop @group */ |
601 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
602 | goto handle_bb; | |
603 | ||
604 | /* Zero out all of the inode table blocks */ | |
605 | block = group_data[i].inode_table; | |
606 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
607 | block, sbi->s_itb_per_group); | |
608 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
609 | GFP_NOFS); | |
610 | if (err) | |
611 | goto out; | |
612 | ||
613 | handle_bb: | |
614 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
615 | goto handle_ib; | |
616 | ||
617 | /* Initialize block bitmap of the @group */ | |
618 | block = group_data[i].block_bitmap; | |
83448bdf | 619 | err = ext4_resize_ensure_credits_batch(handle, 1); |
a4130367 | 620 | if (err < 0) |
33afdcc5 YY |
621 | goto out; |
622 | ||
623 | bh = bclean(handle, sb, block); | |
624 | if (IS_ERR(bh)) { | |
625 | err = PTR_ERR(bh); | |
626 | goto out; | |
627 | } | |
01f795f9 YY |
628 | overhead = ext4_group_overhead_blocks(sb, group); |
629 | if (overhead != 0) { | |
33afdcc5 YY |
630 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
631 | start); | |
d77147ff | 632 | ext4_set_bits(bh->b_data, 0, |
633 | EXT4_NUM_B2C(sbi, overhead)); | |
33afdcc5 | 634 | } |
d77147ff | 635 | ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), |
33afdcc5 YY |
636 | sb->s_blocksize * 8, bh->b_data); |
637 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
9e402893 | 638 | brelse(bh); |
33afdcc5 YY |
639 | if (err) |
640 | goto out; | |
33afdcc5 YY |
641 | |
642 | handle_ib: | |
643 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
644 | continue; | |
645 | ||
646 | /* Initialize inode bitmap of the @group */ | |
647 | block = group_data[i].inode_bitmap; | |
83448bdf | 648 | err = ext4_resize_ensure_credits_batch(handle, 1); |
a4130367 | 649 | if (err < 0) |
33afdcc5 YY |
650 | goto out; |
651 | /* Mark unused entries in inode bitmap used */ | |
652 | bh = bclean(handle, sb, block); | |
653 | if (IS_ERR(bh)) { | |
654 | err = PTR_ERR(bh); | |
655 | goto out; | |
656 | } | |
657 | ||
658 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
659 | sb->s_blocksize * 8, bh->b_data); | |
660 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
9e402893 | 661 | brelse(bh); |
33afdcc5 YY |
662 | if (err) |
663 | goto out; | |
33afdcc5 | 664 | } |
33afdcc5 YY |
665 | |
666 | /* Mark group tables in block bitmap */ | |
667 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
668 | count = group_table_count[j]; | |
669 | start = (&group_data[0].block_bitmap)[j]; | |
670 | block = start; | |
671 | for (i = 1; i < flex_gd->count; i++) { | |
672 | block += group_table_count[j]; | |
673 | if (block == (&group_data[i].block_bitmap)[j]) { | |
674 | count += group_table_count[j]; | |
675 | continue; | |
676 | } | |
677 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 678 | flex_gd, |
679 | EXT4_B2C(sbi, start), | |
680 | EXT4_B2C(sbi, | |
681 | start + count | |
682 | - 1)); | |
33afdcc5 YY |
683 | if (err) |
684 | goto out; | |
685 | count = group_table_count[j]; | |
b93c9535 | 686 | start = (&group_data[i].block_bitmap)[j]; |
33afdcc5 YY |
687 | block = start; |
688 | } | |
689 | ||
690 | if (count) { | |
691 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 692 | flex_gd, |
693 | EXT4_B2C(sbi, start), | |
694 | EXT4_B2C(sbi, | |
695 | start + count | |
696 | - 1)); | |
33afdcc5 YY |
697 | if (err) |
698 | goto out; | |
699 | } | |
700 | } | |
701 | ||
702 | out: | |
33afdcc5 YY |
703 | err2 = ext4_journal_stop(handle); |
704 | if (err2 && !err) | |
705 | err = err2; | |
706 | ||
707 | return err; | |
708 | } | |
709 | ||
ac27a0ec DK |
710 | /* |
711 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 712 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
713 | * calling this for the first time. In a sparse filesystem it will be the |
714 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
715 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
716 | */ | |
617ba13b | 717 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
718 | unsigned *five, unsigned *seven) |
719 | { | |
720 | unsigned *min = three; | |
721 | int mult = 3; | |
722 | unsigned ret; | |
723 | ||
e2b911c5 | 724 | if (!ext4_has_feature_sparse_super(sb)) { |
ac27a0ec DK |
725 | ret = *min; |
726 | *min += 1; | |
727 | return ret; | |
728 | } | |
729 | ||
730 | if (*five < *min) { | |
731 | min = five; | |
732 | mult = 5; | |
733 | } | |
734 | if (*seven < *min) { | |
735 | min = seven; | |
736 | mult = 7; | |
737 | } | |
738 | ||
739 | ret = *min; | |
740 | *min *= mult; | |
741 | ||
742 | return ret; | |
743 | } | |
744 | ||
745 | /* | |
746 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
747 | * It is assumed that they are stored in group order. Returns the number of | |
748 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
749 | */ | |
750 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 751 | ext4_group_t end, |
ac27a0ec DK |
752 | struct buffer_head *primary) |
753 | { | |
617ba13b | 754 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
755 | unsigned three = 1; |
756 | unsigned five = 5; | |
757 | unsigned seven = 7; | |
758 | unsigned grp; | |
759 | __le32 *p = (__le32 *)primary->b_data; | |
760 | int gdbackups = 0; | |
761 | ||
617ba13b | 762 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
763 | if (le32_to_cpu(*p++) != |
764 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 765 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 766 | " missing grp %d (%llu)", |
ac27a0ec | 767 | blk, grp, |
bd81d8ee LV |
768 | grp * |
769 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
770 | blk); | |
ac27a0ec DK |
771 | return -EINVAL; |
772 | } | |
617ba13b | 773 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
774 | return -EFBIG; |
775 | } | |
776 | ||
777 | return gdbackups; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Called when we need to bring a reserved group descriptor table block into | |
782 | * use from the resize inode. The primary copy of the new GDT block currently | |
783 | * is an indirect block (under the double indirect block in the resize inode). | |
784 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
785 | * block, in group order. Even though we know all the block numbers we need, | |
786 | * we check to ensure that the resize inode has actually reserved these blocks. | |
787 | * | |
788 | * Don't need to update the block bitmaps because the blocks are still in use. | |
789 | * | |
790 | * We get all of the error cases out of the way, so that we are sure to not | |
791 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
792 | */ | |
793 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 794 | ext4_group_t group) |
ac27a0ec DK |
795 | { |
796 | struct super_block *sb = inode->i_sb; | |
617ba13b | 797 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 798 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 799 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
fb265c9c TT |
800 | struct buffer_head **o_group_desc, **n_group_desc = NULL; |
801 | struct buffer_head *dind = NULL; | |
802 | struct buffer_head *gdb_bh = NULL; | |
ac27a0ec | 803 | int gdbackups; |
fb265c9c | 804 | struct ext4_iloc iloc = { .bh = NULL }; |
ac27a0ec DK |
805 | __le32 *data; |
806 | int err; | |
807 | ||
808 | if (test_opt(sb, DEBUG)) | |
809 | printk(KERN_DEBUG | |
617ba13b | 810 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
811 | gdb_num); |
812 | ||
fb265c9c TT |
813 | gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
814 | if (IS_ERR(gdb_bh)) | |
815 | return PTR_ERR(gdb_bh); | |
ac27a0ec | 816 | |
c72df9f9 | 817 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 818 | if (gdbackups < 0) { |
ac27a0ec | 819 | err = gdbackups; |
fb265c9c | 820 | goto errout; |
ac27a0ec DK |
821 | } |
822 | ||
617ba13b | 823 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
fb265c9c TT |
824 | dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
825 | if (IS_ERR(dind)) { | |
826 | err = PTR_ERR(dind); | |
827 | dind = NULL; | |
828 | goto errout; | |
ac27a0ec DK |
829 | } |
830 | ||
831 | data = (__le32 *)dind->b_data; | |
617ba13b | 832 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 833 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 834 | group, gdblock); |
ac27a0ec | 835 | err = -EINVAL; |
fb265c9c | 836 | goto errout; |
ac27a0ec DK |
837 | } |
838 | ||
5d601255 | 839 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
b4097142 TT |
840 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
841 | if (unlikely(err)) | |
fb265c9c | 842 | goto errout; |
ac27a0ec | 843 | |
5d601255 | 844 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
2f919710 | 845 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 846 | if (unlikely(err)) |
fb265c9c | 847 | goto errout; |
ac27a0ec | 848 | |
5d601255 | 849 | BUFFER_TRACE(dind, "get_write_access"); |
b4097142 | 850 | err = ext4_journal_get_write_access(handle, dind); |
c9e87161 | 851 | if (unlikely(err)) { |
b4097142 | 852 | ext4_std_error(sb, err); |
c9e87161 DL |
853 | goto errout; |
854 | } | |
ac27a0ec | 855 | |
617ba13b | 856 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
857 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
858 | if (unlikely(err)) | |
fb265c9c | 859 | goto errout; |
ac27a0ec | 860 | |
71b565ce TT |
861 | n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), |
862 | GFP_KERNEL); | |
ac27a0ec DK |
863 | if (!n_group_desc) { |
864 | err = -ENOMEM; | |
f18a5f21 TT |
865 | ext4_warning(sb, "not enough memory for %lu groups", |
866 | gdb_num + 1); | |
fb265c9c | 867 | goto errout; |
ac27a0ec DK |
868 | } |
869 | ||
870 | /* | |
871 | * Finally, we have all of the possible failures behind us... | |
872 | * | |
873 | * Remove new GDT block from inode double-indirect block and clear out | |
874 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
875 | * from the reserved inode). We don't need to change the bitmaps for | |
876 | * these blocks, because they are marked as in-use from being in the | |
877 | * reserved inode, and will become GDT blocks (primary and backup). | |
878 | */ | |
617ba13b | 879 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
880 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
881 | if (unlikely(err)) { | |
882 | ext4_std_error(sb, err); | |
fb265c9c | 883 | goto errout; |
b4097142 | 884 | } |
d77147ff | 885 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> |
886 | (9 - EXT4_SB(sb)->s_cluster_bits); | |
617ba13b | 887 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
888 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
889 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
890 | if (unlikely(err)) { |
891 | ext4_std_error(sb, err); | |
8c380ab4 | 892 | iloc.bh = NULL; |
fb265c9c | 893 | goto errout; |
b4097142 TT |
894 | } |
895 | brelse(dind); | |
ac27a0ec | 896 | |
1d0c3924 TT |
897 | rcu_read_lock(); |
898 | o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); | |
ac27a0ec | 899 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 900 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
1d0c3924 | 901 | rcu_read_unlock(); |
2f919710 | 902 | n_group_desc[gdb_num] = gdb_bh; |
1d0c3924 | 903 | rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); |
617ba13b | 904 | EXT4_SB(sb)->s_gdb_count++; |
1d0c3924 | 905 | ext4_kvfree_array_rcu(o_group_desc); |
ac27a0ec | 906 | |
05c2c00f | 907 | lock_buffer(EXT4_SB(sb)->s_sbh); |
e8546d06 | 908 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
05c2c00f JK |
909 | ext4_superblock_csum_set(sb); |
910 | unlock_buffer(EXT4_SB(sb)->s_sbh); | |
a3f5cf14 | 911 | err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
b4097142 TT |
912 | if (err) |
913 | ext4_std_error(sb, err); | |
b4097142 | 914 | return err; |
fb265c9c | 915 | errout: |
b93b41d4 | 916 | kvfree(n_group_desc); |
ac27a0ec | 917 | brelse(iloc.bh); |
ac27a0ec | 918 | brelse(dind); |
2f919710 | 919 | brelse(gdb_bh); |
ac27a0ec | 920 | |
617ba13b | 921 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
922 | return err; |
923 | } | |
924 | ||
01f795f9 YY |
925 | /* |
926 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
927 | */ | |
928 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
929 | handle_t *handle, ext4_group_t group) { | |
930 | ext4_fsblk_t gdblock; | |
931 | struct buffer_head *gdb_bh; | |
932 | struct buffer_head **o_group_desc, **n_group_desc; | |
933 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
934 | int err; | |
935 | ||
936 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
937 | ext4_bg_has_super(sb, group); | |
fb265c9c TT |
938 | gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
939 | if (IS_ERR(gdb_bh)) | |
940 | return PTR_ERR(gdb_bh); | |
71b565ce TT |
941 | n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *), |
942 | GFP_KERNEL); | |
01f795f9 | 943 | if (!n_group_desc) { |
61a9c11e | 944 | brelse(gdb_bh); |
01f795f9 YY |
945 | err = -ENOMEM; |
946 | ext4_warning(sb, "not enough memory for %lu groups", | |
947 | gdb_num + 1); | |
948 | return err; | |
949 | } | |
950 | ||
1d0c3924 TT |
951 | rcu_read_lock(); |
952 | o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc); | |
01f795f9 YY |
953 | memcpy(n_group_desc, o_group_desc, |
954 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
1d0c3924 | 955 | rcu_read_unlock(); |
01f795f9 | 956 | n_group_desc[gdb_num] = gdb_bh; |
d64264d6 LC |
957 | |
958 | BUFFER_TRACE(gdb_bh, "get_write_access"); | |
959 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
960 | if (err) { | |
961 | kvfree(n_group_desc); | |
962 | brelse(gdb_bh); | |
963 | return err; | |
964 | } | |
965 | ||
1d0c3924 | 966 | rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc); |
01f795f9 | 967 | EXT4_SB(sb)->s_gdb_count++; |
1d0c3924 | 968 | ext4_kvfree_array_rcu(o_group_desc); |
01f795f9 YY |
969 | return err; |
970 | } | |
971 | ||
ac27a0ec DK |
972 | /* |
973 | * Called when we are adding a new group which has a backup copy of each of | |
974 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
975 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
976 | * that they are kept for future resizing and not allocated to files. | |
977 | * | |
978 | * Each reserved backup GDT block will go into a different indirect block. | |
979 | * The indirect blocks are actually the primary reserved GDT blocks, | |
980 | * so we know in advance what their block numbers are. We only get the | |
981 | * double-indirect block to verify it is pointing to the primary reserved | |
982 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
983 | * backup GDT blocks are stored in their reserved primary GDT block. | |
984 | */ | |
985 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 986 | ext4_group_t group) |
ac27a0ec DK |
987 | { |
988 | struct super_block *sb = inode->i_sb; | |
617ba13b | 989 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
d77147ff | 990 | int cluster_bits = EXT4_SB(sb)->s_cluster_bits; |
ac27a0ec DK |
991 | struct buffer_head **primary; |
992 | struct buffer_head *dind; | |
617ba13b MC |
993 | struct ext4_iloc iloc; |
994 | ext4_fsblk_t blk; | |
ac27a0ec DK |
995 | __le32 *data, *end; |
996 | int gdbackups = 0; | |
997 | int res, i; | |
998 | int err; | |
999 | ||
6da2ec56 | 1000 | primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
1001 | if (!primary) |
1002 | return -ENOMEM; | |
1003 | ||
617ba13b | 1004 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
fb265c9c TT |
1005 | dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
1006 | if (IS_ERR(dind)) { | |
1007 | err = PTR_ERR(dind); | |
1008 | dind = NULL; | |
ac27a0ec DK |
1009 | goto exit_free; |
1010 | } | |
1011 | ||
617ba13b | 1012 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
1013 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
1014 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 1015 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
1016 | |
1017 | /* Get each reserved primary GDT block and verify it holds backups */ | |
1018 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
1019 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 1020 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
1021 | " not at offset %ld", |
1022 | blk, | |
1023 | (long)(data - (__le32 *)dind->b_data)); | |
1024 | err = -EINVAL; | |
1025 | goto exit_bh; | |
1026 | } | |
fb265c9c TT |
1027 | primary[res] = ext4_sb_bread(sb, blk, 0); |
1028 | if (IS_ERR(primary[res])) { | |
1029 | err = PTR_ERR(primary[res]); | |
1030 | primary[res] = NULL; | |
ac27a0ec DK |
1031 | goto exit_bh; |
1032 | } | |
c72df9f9 YY |
1033 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
1034 | if (gdbackups < 0) { | |
ac27a0ec DK |
1035 | brelse(primary[res]); |
1036 | err = gdbackups; | |
1037 | goto exit_bh; | |
1038 | } | |
1039 | if (++data >= end) | |
1040 | data = (__le32 *)dind->b_data; | |
1041 | } | |
1042 | ||
1043 | for (i = 0; i < reserved_gdb; i++) { | |
5d601255 | 1044 | BUFFER_TRACE(primary[i], "get_write_access"); |
37be2f59 | 1045 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 1046 | goto exit_bh; |
ac27a0ec DK |
1047 | } |
1048 | ||
617ba13b | 1049 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
1050 | goto exit_bh; |
1051 | ||
1052 | /* | |
1053 | * Finally we can add each of the reserved backup GDT blocks from | |
1054 | * the new group to its reserved primary GDT block. | |
1055 | */ | |
668f4dc5 | 1056 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1057 | for (i = 0; i < reserved_gdb; i++) { |
1058 | int err2; | |
1059 | data = (__le32 *)primary[i]->b_data; | |
1060 | /* printk("reserving backup %lu[%u] = %lu\n", | |
1061 | primary[i]->b_blocknr, gdbackups, | |
1062 | blk + primary[i]->b_blocknr); */ | |
1063 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 1064 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
1065 | if (!err) |
1066 | err = err2; | |
1067 | } | |
d77147ff | 1068 | |
1069 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); | |
617ba13b | 1070 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
1071 | |
1072 | exit_bh: | |
1073 | while (--res >= 0) | |
1074 | brelse(primary[res]); | |
1075 | brelse(dind); | |
1076 | ||
1077 | exit_free: | |
1078 | kfree(primary); | |
1079 | ||
1080 | return err; | |
1081 | } | |
1082 | ||
1083 | /* | |
617ba13b | 1084 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1085 | * of the main resize transaction, because e2fsck will re-write them if there |
1086 | * is a problem (basically only OOM will cause a problem). However, we | |
1087 | * _should_ update the backups if possible, in case the primary gets trashed | |
1088 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1089 | * important part is that the new block and inode counts are in the backup | |
1090 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1091 | * | |
32ed5058 TT |
1092 | * We do not need take the s_resize_lock for this, because these |
1093 | * blocks are not otherwise touched by the filesystem code when it is | |
1094 | * mounted. We don't need to worry about last changing from | |
1095 | * sbi->s_groups_count, because the worst that can happen is that we | |
1096 | * do not copy the full number of backups at this time. The resize | |
1097 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1098 | */ |
904dad47 | 1099 | static void update_backups(struct super_block *sb, sector_t blk_off, char *data, |
01f795f9 | 1100 | int size, int meta_bg) |
ac27a0ec | 1101 | { |
617ba13b | 1102 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1103 | ext4_group_t last; |
617ba13b | 1104 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1105 | unsigned three = 1; |
1106 | unsigned five = 5; | |
1107 | unsigned seven = 7; | |
01f795f9 | 1108 | ext4_group_t group = 0; |
ac27a0ec DK |
1109 | int rest = sb->s_blocksize - size; |
1110 | handle_t *handle; | |
1111 | int err = 0, err2; | |
1112 | ||
9924a92a | 1113 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1114 | if (IS_ERR(handle)) { |
1115 | group = 1; | |
1116 | err = PTR_ERR(handle); | |
1117 | goto exit_err; | |
1118 | } | |
1119 | ||
01f795f9 YY |
1120 | if (meta_bg == 0) { |
1121 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1122 | last = sbi->s_groups_count; | |
1123 | } else { | |
904dad47 | 1124 | group = ext4_get_group_number(sb, blk_off) + 1; |
01f795f9 YY |
1125 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); |
1126 | } | |
1127 | ||
1128 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1129 | struct buffer_head *bh; |
01f795f9 | 1130 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1131 | |
1132 | /* Out of journal space, and can't get more - abort - so sad */ | |
83448bdf | 1133 | err = ext4_resize_ensure_credits_batch(handle, 1); |
a4130367 | 1134 | if (err < 0) |
ac27a0ec DK |
1135 | break; |
1136 | ||
01f795f9 | 1137 | if (meta_bg == 0) |
9378c676 | 1138 | backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; |
01f795f9 YY |
1139 | else |
1140 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1141 | ext4_bg_has_super(sb, group)); | |
1142 | ||
1143 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1144 | if (unlikely(!bh)) { |
860d21e2 | 1145 | err = -ENOMEM; |
ac27a0ec DK |
1146 | break; |
1147 | } | |
01f795f9 YY |
1148 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1149 | backup_block, backup_block - | |
1150 | ext4_group_first_block_no(sb, group)); | |
5d601255 | 1151 | BUFFER_TRACE(bh, "get_write_access"); |
ea0abbb6 VA |
1152 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
1153 | brelse(bh); | |
ac27a0ec | 1154 | break; |
ea0abbb6 | 1155 | } |
ac27a0ec DK |
1156 | lock_buffer(bh); |
1157 | memcpy(bh->b_data, data, size); | |
1158 | if (rest) | |
1159 | memset(bh->b_data + size, 0, rest); | |
1160 | set_buffer_uptodate(bh); | |
1161 | unlock_buffer(bh); | |
b4097142 TT |
1162 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1163 | if (unlikely(err)) | |
1164 | ext4_std_error(sb, err); | |
ac27a0ec | 1165 | brelse(bh); |
01f795f9 YY |
1166 | |
1167 | if (meta_bg == 0) | |
1168 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1169 | else if (group == last) | |
1170 | break; | |
1171 | else | |
1172 | group = last; | |
ac27a0ec | 1173 | } |
617ba13b | 1174 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1175 | err = err2; |
1176 | ||
1177 | /* | |
1178 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1179 | * late to revert the resize, we shouldn't fail just because of | |
1180 | * the backup copies (they are only needed in case of corruption). | |
1181 | * | |
1182 | * However, if we got here we have a journal problem too, so we | |
1183 | * can't really start a transaction to mark the superblock. | |
1184 | * Chicken out and just set the flag on the hope it will be written | |
1185 | * to disk, and if not - we will simply wait until next fsck. | |
1186 | */ | |
1187 | exit_err: | |
1188 | if (err) { | |
12062ddd | 1189 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1190 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1191 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1192 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1193 | mark_buffer_dirty(sbi->s_sbh); |
1194 | } | |
1195 | } | |
1196 | ||
bb08c1e7 YY |
1197 | /* |
1198 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1199 | * starting at @group | |
1200 | * | |
1201 | * @handle: journal handle | |
1202 | * @sb: super block | |
1203 | * @group: the group no. of the first group desc to be added | |
1204 | * @resize_inode: the resize inode | |
1205 | * @count: number of group descriptors to be added | |
1206 | */ | |
1207 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1208 | ext4_group_t group, struct inode *resize_inode, | |
1209 | ext4_group_t count) | |
1210 | { | |
1211 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1212 | struct ext4_super_block *es = sbi->s_es; | |
1213 | struct buffer_head *gdb_bh; | |
1214 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1215 | int meta_bg; |
bb08c1e7 | 1216 | |
e2b911c5 | 1217 | meta_bg = ext4_has_feature_meta_bg(sb); |
bb08c1e7 YY |
1218 | for (i = 0; i < count; i++, group++) { |
1219 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1220 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1221 | ||
1222 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1223 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1224 | ||
1225 | /* | |
1226 | * We will only either add reserved group blocks to a backup group | |
1227 | * or remove reserved blocks for the first group in a new group block. | |
1228 | * Doing both would be mean more complex code, and sane people don't | |
1229 | * use non-sparse filesystems anymore. This is already checked above. | |
1230 | */ | |
1231 | if (gdb_off) { | |
1d0c3924 TT |
1232 | gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, |
1233 | gdb_num); | |
5d601255 | 1234 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
bb08c1e7 YY |
1235 | err = ext4_journal_get_write_access(handle, gdb_bh); |
1236 | ||
1237 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1238 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1239 | } else if (meta_bg != 0) { |
1240 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1241 | } else { | |
bb08c1e7 | 1242 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1243 | } |
bb08c1e7 YY |
1244 | if (err) |
1245 | break; | |
1246 | } | |
1247 | return err; | |
1248 | } | |
1249 | ||
41a246d1 DW |
1250 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1251 | { | |
1252 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1253 | if (unlikely(!bh)) |
41a246d1 | 1254 | return NULL; |
7f1468d1 | 1255 | if (!bh_uptodate_or_lock(bh)) { |
2d069c08 | 1256 | if (ext4_read_bh(bh, 0, NULL) < 0) { |
7f1468d1 DM |
1257 | brelse(bh); |
1258 | return NULL; | |
1259 | } | |
41a246d1 | 1260 | } |
41a246d1 DW |
1261 | |
1262 | return bh; | |
1263 | } | |
1264 | ||
1265 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1266 | ext4_group_t group, | |
1267 | struct ext4_group_desc *gdp, | |
1268 | struct ext4_new_group_data *group_data) | |
1269 | { | |
1270 | struct buffer_head *bh; | |
1271 | ||
9aa5d32b | 1272 | if (!ext4_has_metadata_csum(sb)) |
41a246d1 DW |
1273 | return 0; |
1274 | ||
1275 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1276 | if (!bh) | |
1277 | return -EIO; | |
1278 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1279 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1280 | brelse(bh); | |
1281 | ||
fa77dcfa DW |
1282 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1283 | if (!bh) | |
1284 | return -EIO; | |
79f1ba49 | 1285 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1286 | brelse(bh); |
1287 | ||
41a246d1 DW |
1288 | return 0; |
1289 | } | |
1290 | ||
083f5b24 YY |
1291 | /* |
1292 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1293 | */ | |
1294 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1295 | struct ext4_new_flex_group_data *flex_gd) | |
1296 | { | |
1297 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1298 | struct ext4_group_desc *gdp; | |
1299 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1300 | struct buffer_head *gdb_bh; | |
1301 | ext4_group_t group; | |
1302 | __u16 *bg_flags = flex_gd->bg_flags; | |
1303 | int i, gdb_off, gdb_num, err = 0; | |
d77147ff | 1304 | |
083f5b24 YY |
1305 | |
1306 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1307 | group = group_data->group; | |
1308 | ||
1309 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1310 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1311 | ||
1312 | /* | |
1313 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1314 | */ | |
1d0c3924 | 1315 | gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num); |
083f5b24 | 1316 | /* Update group descriptor block for new group */ |
2716b802 | 1317 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1318 | gdb_off * EXT4_DESC_SIZE(sb)); |
1319 | ||
1320 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1321 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1322 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1323 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1324 | if (err) { | |
1325 | ext4_std_error(sb, err); | |
1326 | break; | |
1327 | } | |
1328 | ||
083f5b24 YY |
1329 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1330 | ext4_free_group_clusters_set(sb, gdp, | |
d77147ff | 1331 | group_data->free_clusters_count); |
083f5b24 | 1332 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1333 | if (ext4_has_group_desc_csum(sb)) |
1334 | ext4_itable_unused_set(sb, gdp, | |
1335 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1336 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1337 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1338 | |
1339 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1340 | if (unlikely(err)) { | |
1341 | ext4_std_error(sb, err); | |
1342 | break; | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * We can allocate memory for mb_alloc based on the new group | |
1347 | * descriptor | |
1348 | */ | |
1349 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1350 | if (err) | |
1351 | break; | |
1352 | } | |
1353 | return err; | |
1354 | } | |
1355 | ||
2e10e2f2 YY |
1356 | /* |
1357 | * ext4_update_super() updates the super block so that the newly added | |
1358 | * groups can be seen by the filesystem. | |
1359 | * | |
1360 | * @sb: super block | |
1361 | * @flex_gd: new added groups | |
1362 | */ | |
1363 | static void ext4_update_super(struct super_block *sb, | |
1364 | struct ext4_new_flex_group_data *flex_gd) | |
1365 | { | |
1366 | ext4_fsblk_t blocks_count = 0; | |
1367 | ext4_fsblk_t free_blocks = 0; | |
1368 | ext4_fsblk_t reserved_blocks = 0; | |
1369 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1370 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1371 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1372 | int i; |
2e10e2f2 YY |
1373 | |
1374 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1375 | /* | |
1376 | * Make the new blocks and inodes valid next. We do this before | |
1377 | * increasing the group count so that once the group is enabled, | |
1378 | * all of its blocks and inodes are already valid. | |
1379 | * | |
1380 | * We always allocate group-by-group, then block-by-block or | |
1381 | * inode-by-inode within a group, so enabling these | |
1382 | * blocks/inodes before the group is live won't actually let us | |
1383 | * allocate the new space yet. | |
1384 | */ | |
1385 | for (i = 0; i < flex_gd->count; i++) { | |
1386 | blocks_count += group_data[i].blocks_count; | |
d77147ff | 1387 | free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); |
2e10e2f2 YY |
1388 | } |
1389 | ||
1390 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1391 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1392 | reserved_blocks *= blocks_count; |
1393 | do_div(reserved_blocks, 100); | |
1394 | ||
05c2c00f | 1395 | lock_buffer(sbi->s_sbh); |
2e10e2f2 | 1396 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); |
636d7e2e | 1397 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1398 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1399 | flex_gd->count); | |
636d7e2e DW |
1400 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1401 | flex_gd->count); | |
2e10e2f2 | 1402 | |
01f795f9 | 1403 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1404 | /* |
1405 | * We need to protect s_groups_count against other CPUs seeing | |
1406 | * inconsistent state in the superblock. | |
1407 | * | |
1408 | * The precise rules we use are: | |
1409 | * | |
1410 | * * Writers must perform a smp_wmb() after updating all | |
1411 | * dependent data and before modifying the groups count | |
1412 | * | |
1413 | * * Readers must perform an smp_rmb() after reading the groups | |
1414 | * count and before reading any dependent data. | |
1415 | * | |
1416 | * NB. These rules can be relaxed when checking the group count | |
1417 | * while freeing data, as we can only allocate from a block | |
1418 | * group after serialising against the group count, and we can | |
1419 | * only then free after serialising in turn against that | |
1420 | * allocation. | |
1421 | */ | |
1422 | smp_wmb(); | |
1423 | ||
1424 | /* Update the global fs size fields */ | |
1425 | sbi->s_groups_count += flex_gd->count; | |
c5c72d81 TT |
1426 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
1427 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
2e10e2f2 YY |
1428 | |
1429 | /* Update the reserved block counts only once the new group is | |
1430 | * active. */ | |
1431 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1432 | reserved_blocks); | |
05c2c00f JK |
1433 | ext4_superblock_csum_set(sb); |
1434 | unlock_buffer(sbi->s_sbh); | |
2e10e2f2 YY |
1435 | |
1436 | /* Update the free space counts */ | |
1437 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1438 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1439 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1440 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1441 | ||
01f795f9 YY |
1442 | ext4_debug("free blocks count %llu", |
1443 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
e2b911c5 | 1444 | if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { |
2e10e2f2 | 1445 | ext4_group_t flex_group; |
7c990728 SJS |
1446 | struct flex_groups *fg; |
1447 | ||
2e10e2f2 | 1448 | flex_group = ext4_flex_group(sbi, group_data[0].group); |
7c990728 | 1449 | fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group); |
90ba983f | 1450 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
7c990728 | 1451 | &fg->free_clusters); |
2e10e2f2 | 1452 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
7c990728 | 1453 | &fg->free_inodes); |
2e10e2f2 YY |
1454 | } |
1455 | ||
952fc18e TT |
1456 | /* |
1457 | * Update the fs overhead information | |
1458 | */ | |
1459 | ext4_calculate_overhead(sb); | |
1460 | ||
2e10e2f2 YY |
1461 | if (test_opt(sb, DEBUG)) |
1462 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1463 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1464 | blocks_count, free_blocks, reserved_blocks); | |
1465 | } | |
1466 | ||
4bac1f8c YY |
1467 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1468 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1469 | * transaction and not have it write the data to disk. | |
1470 | */ | |
1471 | static int ext4_flex_group_add(struct super_block *sb, | |
1472 | struct inode *resize_inode, | |
1473 | struct ext4_new_flex_group_data *flex_gd) | |
1474 | { | |
1475 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1476 | struct ext4_super_block *es = sbi->s_es; | |
1477 | ext4_fsblk_t o_blocks_count; | |
1478 | ext4_grpblk_t last; | |
1479 | ext4_group_t group; | |
1480 | handle_t *handle; | |
1481 | unsigned reserved_gdb; | |
1482 | int err = 0, err2 = 0, credit; | |
1483 | ||
1484 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1485 | ||
1486 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1487 | o_blocks_count = ext4_blocks_count(es); | |
1488 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1489 | BUG_ON(last); | |
1490 | ||
1491 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1492 | if (err) | |
1493 | goto exit; | |
1494 | /* | |
1495 | * We will always be modifying at least the superblock and GDT | |
2c869b26 | 1496 | * blocks. If we are adding a group past the last current GDT block, |
4bac1f8c YY |
1497 | * we will also modify the inode and the dindirect block. If we |
1498 | * are adding a group with superblock/GDT backups we will also | |
1499 | * modify each of the reserved GDT dindirect blocks. | |
1500 | */ | |
2c869b26 JK |
1501 | credit = 3; /* sb, resize inode, resize inode dindirect */ |
1502 | /* GDT blocks */ | |
1503 | credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); | |
1504 | credit += reserved_gdb; /* Reserved GDT dindirect blocks */ | |
9924a92a | 1505 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1506 | if (IS_ERR(handle)) { |
1507 | err = PTR_ERR(handle); | |
1508 | goto exit; | |
1509 | } | |
1510 | ||
5d601255 | 1511 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
4bac1f8c YY |
1512 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1513 | if (err) | |
1514 | goto exit_journal; | |
1515 | ||
1516 | group = flex_gd->groups[0].group; | |
49598e04 | 1517 | BUG_ON(group != sbi->s_groups_count); |
4bac1f8c YY |
1518 | err = ext4_add_new_descs(handle, sb, group, |
1519 | resize_inode, flex_gd->count); | |
1520 | if (err) | |
1521 | goto exit_journal; | |
1522 | ||
1523 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1524 | if (err) | |
1525 | goto exit_journal; | |
1526 | ||
1527 | ext4_update_super(sb, flex_gd); | |
1528 | ||
a3f5cf14 | 1529 | err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); |
4bac1f8c YY |
1530 | |
1531 | exit_journal: | |
1532 | err2 = ext4_journal_stop(handle); | |
1533 | if (!err) | |
1534 | err = err2; | |
1535 | ||
1536 | if (!err) { | |
2ebd1704 YY |
1537 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1538 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1539 | EXT4_DESC_PER_BLOCK(sb)); | |
e2b911c5 | 1540 | int meta_bg = ext4_has_feature_meta_bg(sb); |
0acdb887 | 1541 | sector_t old_gdb = 0; |
2ebd1704 | 1542 | |
4bac1f8c | 1543 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1544 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1545 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1546 | struct buffer_head *gdb_bh; |
2ebd1704 | 1547 | |
1d0c3924 TT |
1548 | gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, |
1549 | gdb_num); | |
0acdb887 TM |
1550 | if (old_gdb == gdb_bh->b_blocknr) |
1551 | continue; | |
4bac1f8c | 1552 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1553 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1554 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1555 | } |
1556 | } | |
1557 | exit: | |
1558 | return err; | |
1559 | } | |
1560 | ||
19c5246d YY |
1561 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1562 | struct ext4_new_flex_group_data *flex_gd, | |
1563 | ext4_fsblk_t n_blocks_count, | |
1564 | unsigned long flexbg_size) | |
1565 | { | |
d77147ff | 1566 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1567 | struct ext4_super_block *es = sbi->s_es; | |
19c5246d YY |
1568 | struct ext4_new_group_data *group_data = flex_gd->groups; |
1569 | ext4_fsblk_t o_blocks_count; | |
1570 | ext4_group_t n_group; | |
1571 | ext4_group_t group; | |
1572 | ext4_group_t last_group; | |
1573 | ext4_grpblk_t last; | |
d77147ff | 1574 | ext4_grpblk_t clusters_per_group; |
19c5246d YY |
1575 | unsigned long i; |
1576 | ||
d77147ff | 1577 | clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); |
19c5246d YY |
1578 | |
1579 | o_blocks_count = ext4_blocks_count(es); | |
1580 | ||
1581 | if (o_blocks_count == n_blocks_count) | |
1582 | return 0; | |
1583 | ||
1584 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1585 | BUG_ON(last); | |
1586 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1587 | ||
1588 | last_group = group | (flexbg_size - 1); | |
1589 | if (last_group > n_group) | |
1590 | last_group = n_group; | |
1591 | ||
1592 | flex_gd->count = last_group - group + 1; | |
1593 | ||
1594 | for (i = 0; i < flex_gd->count; i++) { | |
1595 | int overhead; | |
1596 | ||
1597 | group_data[i].group = group + i; | |
d77147ff | 1598 | group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); |
01f795f9 | 1599 | overhead = ext4_group_overhead_blocks(sb, group + i); |
d77147ff | 1600 | group_data[i].mdata_blocks = overhead; |
1601 | group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); | |
7f511862 | 1602 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1603 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1604 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1605 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1606 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1607 | } else | |
19c5246d YY |
1608 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1609 | } | |
1610 | ||
feb0ab32 | 1611 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1612 | /* We need to initialize block bitmap of last group. */ |
1613 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1614 | ||
d77147ff | 1615 | if ((last_group == n_group) && (last != clusters_per_group - 1)) { |
1616 | group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); | |
1617 | group_data[i - 1].free_clusters_count -= clusters_per_group - | |
1618 | last - 1; | |
19c5246d YY |
1619 | } |
1620 | ||
1621 | return 1; | |
1622 | } | |
1623 | ||
ac27a0ec DK |
1624 | /* Add group descriptor data to an existing or new group descriptor block. |
1625 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1626 | * the filesystem, because we cannot abort the transaction and not have it | |
1627 | * write the data to disk. | |
1628 | * | |
1629 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1630 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1631 | * | |
1632 | * We only need to hold the superblock lock while we are actually adding | |
1633 | * in the new group's counts to the superblock. Prior to that we have | |
1634 | * not really "added" the group at all. We re-check that we are still | |
1635 | * adding in the last group in case things have changed since verifying. | |
1636 | */ | |
617ba13b | 1637 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1638 | { |
61f296cc | 1639 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1640 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1641 | struct ext4_super_block *es = sbi->s_es; | |
1642 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1643 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1644 | struct inode *inode = NULL; |
03b40e34 | 1645 | int gdb_off; |
61f296cc YY |
1646 | int err; |
1647 | __u16 bg_flags = 0; | |
ac27a0ec | 1648 | |
617ba13b | 1649 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
ac27a0ec | 1650 | |
e2b911c5 | 1651 | if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { |
12062ddd | 1652 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1653 | return -EPERM; |
1654 | } | |
1655 | ||
bd81d8ee LV |
1656 | if (ext4_blocks_count(es) + input->blocks_count < |
1657 | ext4_blocks_count(es)) { | |
12062ddd | 1658 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1659 | return -EINVAL; |
1660 | } | |
1661 | ||
617ba13b | 1662 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1663 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1664 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1665 | return -EINVAL; |
1666 | } | |
1667 | ||
1668 | if (reserved_gdb || gdb_off == 0) { | |
e647e291 | 1669 | if (!ext4_has_feature_resize_inode(sb) || |
e2b911c5 | 1670 | !le16_to_cpu(es->s_reserved_gdt_blocks)) { |
12062ddd | 1671 | ext4_warning(sb, |
ac27a0ec DK |
1672 | "No reserved GDT blocks, can't resize"); |
1673 | return -EPERM; | |
1674 | } | |
8a363970 | 1675 | inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); |
1d1fe1ee | 1676 | if (IS_ERR(inode)) { |
12062ddd | 1677 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1678 | return PTR_ERR(inode); |
ac27a0ec DK |
1679 | } |
1680 | } | |
1681 | ||
920313a7 | 1682 | |
61f296cc | 1683 | err = verify_group_input(sb, input); |
08c3a813 | 1684 | if (err) |
61f296cc | 1685 | goto out; |
ac27a0ec | 1686 | |
117fff10 TT |
1687 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1688 | if (err) | |
7f511862 | 1689 | goto out; |
117fff10 | 1690 | |
28623c2f TT |
1691 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1692 | if (err) | |
1693 | goto out; | |
1694 | ||
61f296cc YY |
1695 | flex_gd.count = 1; |
1696 | flex_gd.groups = input; | |
1697 | flex_gd.bg_flags = &bg_flags; | |
1698 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1699 | out: | |
ac27a0ec DK |
1700 | iput(inode); |
1701 | return err; | |
617ba13b | 1702 | } /* ext4_group_add */ |
ac27a0ec | 1703 | |
18e31438 YY |
1704 | /* |
1705 | * extend a group without checking assuming that checking has been done. | |
1706 | */ | |
1707 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1708 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1709 | { | |
1710 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1711 | handle_t *handle; | |
1712 | int err = 0, err2; | |
1713 | ||
1714 | /* We will update the superblock, one block bitmap, and | |
1715 | * one group descriptor via ext4_group_add_blocks(). | |
1716 | */ | |
9924a92a | 1717 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1718 | if (IS_ERR(handle)) { |
1719 | err = PTR_ERR(handle); | |
1720 | ext4_warning(sb, "error %d on journal start", err); | |
1721 | return err; | |
1722 | } | |
1723 | ||
5d601255 | 1724 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
18e31438 YY |
1725 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
1726 | if (err) { | |
1727 | ext4_warning(sb, "error %d on journal write access", err); | |
1728 | goto errout; | |
1729 | } | |
1730 | ||
05c2c00f | 1731 | lock_buffer(EXT4_SB(sb)->s_sbh); |
18e31438 | 1732 | ext4_blocks_count_set(es, o_blocks_count + add); |
636d7e2e | 1733 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
05c2c00f JK |
1734 | ext4_superblock_csum_set(sb); |
1735 | unlock_buffer(EXT4_SB(sb)->s_sbh); | |
18e31438 YY |
1736 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1737 | o_blocks_count + add); | |
1738 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1739 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1740 | if (err) | |
1741 | goto errout; | |
a3f5cf14 | 1742 | ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
18e31438 YY |
1743 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, |
1744 | o_blocks_count + add); | |
1745 | errout: | |
1746 | err2 = ext4_journal_stop(handle); | |
1747 | if (err2 && !err) | |
1748 | err = err2; | |
1749 | ||
1750 | if (!err) { | |
1751 | if (test_opt(sb, DEBUG)) | |
1752 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1753 | "blocks\n", ext4_blocks_count(es)); | |
6ca792ed | 1754 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
01f795f9 | 1755 | (char *)es, sizeof(struct ext4_super_block), 0); |
18e31438 YY |
1756 | } |
1757 | return err; | |
1758 | } | |
1759 | ||
2b2d6d01 TT |
1760 | /* |
1761 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1762 | * point is only used to extend the current filesystem to the end of the last |
1763 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1764 | * for emergencies (because it has no dependencies on reserved blocks). | |
1765 | * | |
617ba13b | 1766 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1767 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1768 | * GDT blocks are reserved to grow to the desired size. | |
1769 | */ | |
617ba13b MC |
1770 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1771 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1772 | { |
617ba13b | 1773 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1774 | ext4_grpblk_t last; |
1775 | ext4_grpblk_t add; | |
af5bc92d | 1776 | struct buffer_head *bh; |
d89651c8 | 1777 | int err; |
5f21b0e6 | 1778 | ext4_group_t group; |
ac27a0ec | 1779 | |
bd81d8ee | 1780 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1781 | |
1782 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1783 | ext4_msg(sb, KERN_DEBUG, |
1784 | "extending last group from %llu to %llu blocks", | |
1785 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1786 | |
1787 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1788 | return 0; | |
1789 | ||
1790 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1791 | ext4_msg(sb, KERN_ERR, |
1792 | "filesystem too large to resize to %llu blocks safely", | |
1793 | n_blocks_count); | |
ac27a0ec DK |
1794 | return -EINVAL; |
1795 | } | |
1796 | ||
1797 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1798 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1799 | return -EINVAL; |
ac27a0ec DK |
1800 | } |
1801 | ||
1802 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1803 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1804 | |
1805 | if (last == 0) { | |
12062ddd | 1806 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1807 | return -EPERM; |
1808 | } | |
1809 | ||
617ba13b | 1810 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1811 | |
1812 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1813 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1814 | return -EINVAL; |
1815 | } | |
1816 | ||
1817 | if (o_blocks_count + add > n_blocks_count) | |
1818 | add = n_blocks_count - o_blocks_count; | |
1819 | ||
1820 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1821 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1822 | o_blocks_count + add, add); |
1823 | ||
1824 | /* See if the device is actually as big as what was requested */ | |
0a846f49 | 1825 | bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); |
1826 | if (IS_ERR(bh)) { | |
12062ddd | 1827 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1828 | return -ENOSPC; |
1829 | } | |
1830 | brelse(bh); | |
1831 | ||
d89651c8 | 1832 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1833 | return err; |
617ba13b | 1834 | } /* ext4_group_extend */ |
19c5246d | 1835 | |
1c6bd717 TT |
1836 | |
1837 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1838 | { | |
1839 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Release the resize inode and drop the resize_inode feature if there | |
1844 | * are no more reserved gdt blocks, and then convert the file system | |
1845 | * to enable meta_bg | |
1846 | */ | |
1847 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1848 | { | |
1849 | handle_t *handle; | |
1850 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1851 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1852 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1853 | ext4_fsblk_t nr; |
1854 | int i, ret, err = 0; | |
1855 | int credits = 1; | |
1856 | ||
1857 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1858 | if (inode) { |
1c6bd717 TT |
1859 | if (es->s_reserved_gdt_blocks) { |
1860 | ext4_error(sb, "Unexpected non-zero " | |
1861 | "s_reserved_gdt_blocks"); | |
1862 | return -EPERM; | |
1863 | } | |
1c6bd717 TT |
1864 | |
1865 | /* Do a quick sanity check of the resize inode */ | |
d77147ff | 1866 | if (inode->i_blocks != 1 << (inode->i_blkbits - |
1867 | (9 - sbi->s_cluster_bits))) | |
1c6bd717 TT |
1868 | goto invalid_resize_inode; |
1869 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1870 | if (i == EXT4_DIND_BLOCK) { | |
1871 | if (ei->i_data[i]) | |
1872 | continue; | |
1873 | else | |
1874 | goto invalid_resize_inode; | |
1875 | } | |
1876 | if (ei->i_data[i]) | |
1877 | goto invalid_resize_inode; | |
1878 | } | |
1879 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1880 | } | |
1881 | ||
9924a92a | 1882 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1883 | if (IS_ERR(handle)) |
1884 | return PTR_ERR(handle); | |
1885 | ||
5d601255 | 1886 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
1c6bd717 TT |
1887 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1888 | if (err) | |
1889 | goto errout; | |
1890 | ||
05c2c00f | 1891 | lock_buffer(sbi->s_sbh); |
e2b911c5 DW |
1892 | ext4_clear_feature_resize_inode(sb); |
1893 | ext4_set_feature_meta_bg(sb); | |
1c6bd717 TT |
1894 | sbi->s_es->s_first_meta_bg = |
1895 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
05c2c00f JK |
1896 | ext4_superblock_csum_set(sb); |
1897 | unlock_buffer(sbi->s_sbh); | |
1c6bd717 | 1898 | |
a3f5cf14 | 1899 | err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); |
1c6bd717 TT |
1900 | if (err) { |
1901 | ext4_std_error(sb, err); | |
1902 | goto errout; | |
1903 | } | |
1904 | ||
1905 | if (inode) { | |
1906 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1907 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1908 | EXT4_FREE_BLOCKS_METADATA | | |
1909 | EXT4_FREE_BLOCKS_FORGET); | |
1910 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1911 | inode->i_blocks = 0; | |
1912 | ||
1913 | err = ext4_mark_inode_dirty(handle, inode); | |
1914 | if (err) | |
1915 | ext4_std_error(sb, err); | |
1916 | } | |
1917 | ||
1918 | errout: | |
1919 | ret = ext4_journal_stop(handle); | |
1920 | if (!err) | |
1921 | err = ret; | |
1922 | return ret; | |
1923 | ||
1924 | invalid_resize_inode: | |
1925 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1926 | return -EINVAL; | |
1927 | } | |
1928 | ||
19c5246d YY |
1929 | /* |
1930 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1931 | * | |
1932 | * @sb: super block of the fs to be resized | |
1933 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1934 | */ | |
1935 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1936 | { | |
1937 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1938 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1939 | struct ext4_super_block *es = sbi->s_es; | |
1940 | struct buffer_head *bh; | |
01f795f9 YY |
1941 | struct inode *resize_inode = NULL; |
1942 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1943 | unsigned long n_desc_blocks; |
1944 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1945 | ext4_group_t o_group; |
1946 | ext4_group_t n_group; | |
1947 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1948 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1949 | unsigned long last_update_time = 0; |
117fff10 | 1950 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1951 | int meta_bg; |
19c5246d | 1952 | |
59e31c15 | 1953 | /* See if the device is actually as big as what was requested */ |
0a846f49 | 1954 | bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); |
1955 | if (IS_ERR(bh)) { | |
59e31c15 TT |
1956 | ext4_warning(sb, "can't read last block, resize aborted"); |
1957 | return -ENOSPC; | |
1958 | } | |
1959 | brelse(bh); | |
1960 | ||
1c6bd717 | 1961 | retry: |
19c5246d YY |
1962 | o_blocks_count = ext4_blocks_count(es); |
1963 | ||
59e31c15 TT |
1964 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1965 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1966 | |
1967 | if (n_blocks_count < o_blocks_count) { | |
1968 | /* On-line shrinking not supported */ | |
1969 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1970 | return -EINVAL; | |
1971 | } | |
1972 | ||
1973 | if (n_blocks_count == o_blocks_count) | |
1974 | /* Nothing need to do */ | |
1975 | return 0; | |
1976 | ||
bd86298e | 1977 | n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
4f2f76f7 | 1978 | if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
3f8a6411 TT |
1979 | ext4_warning(sb, "resize would cause inodes_count overflow"); |
1980 | return -EINVAL; | |
1981 | } | |
a0ade1de | 1982 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1983 | |
1c6bd717 TT |
1984 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1985 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1986 | |
e2b911c5 | 1987 | meta_bg = ext4_has_feature_meta_bg(sb); |
19c5246d | 1988 | |
e2b911c5 | 1989 | if (ext4_has_feature_resize_inode(sb)) { |
01f795f9 YY |
1990 | if (meta_bg) { |
1991 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1992 | "simultaneously"); | |
1993 | return -EINVAL; | |
1994 | } | |
1c6bd717 TT |
1995 | if (n_desc_blocks > o_desc_blocks + |
1996 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1997 | n_blocks_count_retry = n_blocks_count; | |
1998 | n_desc_blocks = o_desc_blocks + | |
1999 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
2000 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
aec51758 | 2001 | n_blocks_count = (ext4_fsblk_t)n_group * |
f96c3ac8 JK |
2002 | EXT4_BLOCKS_PER_GROUP(sb) + |
2003 | le32_to_cpu(es->s_first_data_block); | |
1c6bd717 | 2004 | n_group--; /* set to last group number */ |
01f795f9 | 2005 | } |
1c6bd717 TT |
2006 | |
2007 | if (!resize_inode) | |
8a363970 TT |
2008 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, |
2009 | EXT4_IGET_SPECIAL); | |
01f795f9 YY |
2010 | if (IS_ERR(resize_inode)) { |
2011 | ext4_warning(sb, "Error opening resize inode"); | |
2012 | return PTR_ERR(resize_inode); | |
2013 | } | |
1c6bd717 TT |
2014 | } |
2015 | ||
59e31c15 | 2016 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
2017 | err = ext4_convert_meta_bg(sb, resize_inode); |
2018 | if (err) | |
2019 | goto out; | |
2020 | if (resize_inode) { | |
2021 | iput(resize_inode); | |
2022 | resize_inode = NULL; | |
2023 | } | |
2024 | if (n_blocks_count_retry) { | |
2025 | n_blocks_count = n_blocks_count_retry; | |
2026 | n_blocks_count_retry = 0; | |
2027 | goto retry; | |
2028 | } | |
19c5246d YY |
2029 | } |
2030 | ||
f0a459de TT |
2031 | /* |
2032 | * Make sure the last group has enough space so that it's | |
2033 | * guaranteed to have enough space for all metadata blocks | |
2034 | * that it might need to hold. (We might not need to store | |
2035 | * the inode table blocks in the last block group, but there | |
2036 | * will be cases where this might be needed.) | |
2037 | */ | |
2038 | if ((ext4_group_first_block_no(sb, n_group) + | |
2039 | ext4_group_overhead_blocks(sb, n_group) + 2 + | |
2040 | sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { | |
2041 | n_blocks_count = ext4_group_first_block_no(sb, n_group); | |
2042 | n_group--; | |
2043 | n_blocks_count_retry = 0; | |
2044 | if (resize_inode) { | |
2045 | iput(resize_inode); | |
2046 | resize_inode = NULL; | |
2047 | } | |
2048 | goto retry; | |
2049 | } | |
2050 | ||
a0ade1de LC |
2051 | /* extend the last group */ |
2052 | if (n_group == o_group) | |
2053 | add = n_blocks_count - o_blocks_count; | |
2054 | else | |
d77147ff | 2055 | add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); |
a0ade1de | 2056 | if (add > 0) { |
19c5246d YY |
2057 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
2058 | if (err) | |
2059 | goto out; | |
2060 | } | |
2061 | ||
d7574ad0 | 2062 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
2063 | goto out; |
2064 | ||
117fff10 TT |
2065 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
2066 | if (err) | |
f348e224 | 2067 | goto out; |
117fff10 | 2068 | |
28623c2f TT |
2069 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
2070 | if (err) | |
2071 | goto out; | |
2072 | ||
19c5246d YY |
2073 | flex_gd = alloc_flex_gd(flexbg_size); |
2074 | if (flex_gd == NULL) { | |
2075 | err = -ENOMEM; | |
2076 | goto out; | |
2077 | } | |
2078 | ||
2079 | /* Add flex groups. Note that a regular group is a | |
2080 | * flex group with 1 group. | |
2081 | */ | |
2082 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
2083 | flexbg_size)) { | |
4da4a56e TT |
2084 | if (jiffies - last_update_time > HZ * 10) { |
2085 | if (last_update_time) | |
2086 | ext4_msg(sb, KERN_INFO, | |
2087 | "resized to %llu blocks", | |
2088 | ext4_blocks_count(es)); | |
2089 | last_update_time = jiffies; | |
2090 | } | |
03c1c290 YY |
2091 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
2092 | break; | |
19c5246d YY |
2093 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
2094 | if (unlikely(err)) | |
2095 | break; | |
2096 | } | |
2097 | ||
1c6bd717 TT |
2098 | if (!err && n_blocks_count_retry) { |
2099 | n_blocks_count = n_blocks_count_retry; | |
2100 | n_blocks_count_retry = 0; | |
2101 | free_flex_gd(flex_gd); | |
2102 | flex_gd = NULL; | |
db6aee62 VA |
2103 | if (resize_inode) { |
2104 | iput(resize_inode); | |
2105 | resize_inode = NULL; | |
2106 | } | |
1c6bd717 TT |
2107 | goto retry; |
2108 | } | |
2109 | ||
19c5246d YY |
2110 | out: |
2111 | if (flex_gd) | |
2112 | free_flex_gd(flex_gd); | |
01f795f9 YY |
2113 | if (resize_inode != NULL) |
2114 | iput(resize_inode); | |
6c732840 LC |
2115 | if (err) |
2116 | ext4_warning(sb, "error (%d) occurred during " | |
2117 | "file system resize", err); | |
2118 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", | |
2119 | ext4_blocks_count(es)); | |
19c5246d YY |
2120 | return err; |
2121 | } |