]>
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 | |
8f82f840 YY |
20 | int ext4_resize_begin(struct super_block *sb) |
21 | { | |
22 | int ret = 0; | |
23 | ||
24 | if (!capable(CAP_SYS_RESOURCE)) | |
25 | return -EPERM; | |
26 | ||
011fa994 TT |
27 | /* |
28 | * If we are not using the primary superblock/GDT copy don't resize, | |
29 | * because the user tools have no way of handling this. Probably a | |
30 | * bad time to do it anyways. | |
31 | */ | |
32 | if (EXT4_SB(sb)->s_sbh->b_blocknr != | |
33 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
34 | ext4_warning(sb, "won't resize using backup superblock at %llu", | |
35 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); | |
36 | return -EPERM; | |
37 | } | |
38 | ||
ce723c31 YY |
39 | /* |
40 | * We are not allowed to do online-resizing on a filesystem mounted | |
41 | * with error, because it can destroy the filesystem easily. | |
42 | */ | |
43 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
44 | ext4_warning(sb, "There are errors in the filesystem, " | |
8d2ae1cb | 45 | "so online resizing is not allowed"); |
ce723c31 YY |
46 | return -EPERM; |
47 | } | |
48 | ||
9549a168 TT |
49 | if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, |
50 | &EXT4_SB(sb)->s_ext4_flags)) | |
8f82f840 YY |
51 | ret = -EBUSY; |
52 | ||
53 | return ret; | |
54 | } | |
55 | ||
56 | void ext4_resize_end(struct super_block *sb) | |
57 | { | |
9549a168 | 58 | clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); |
4e857c58 | 59 | smp_mb__after_atomic(); |
8f82f840 YY |
60 | } |
61 | ||
01f795f9 YY |
62 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
63 | ext4_group_t group) { | |
64 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
65 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
66 | } | |
67 | ||
68 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
69 | ext4_group_t group) { | |
70 | group = ext4_meta_bg_first_group(sb, group); | |
71 | return ext4_group_first_block_no(sb, group); | |
72 | } | |
73 | ||
74 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
75 | ext4_group_t group) { | |
76 | ext4_grpblk_t overhead; | |
77 | overhead = ext4_bg_num_gdb(sb, group); | |
78 | if (ext4_bg_has_super(sb, group)) | |
79 | overhead += 1 + | |
80 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
81 | return overhead; | |
82 | } | |
83 | ||
ac27a0ec DK |
84 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
85 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
86 | ||
87 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 88 | struct ext4_new_group_data *input) |
ac27a0ec | 89 | { |
617ba13b MC |
90 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
91 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 92 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 93 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 94 | ext4_group_t group = input->group; |
617ba13b | 95 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
b302ef2d TT |
96 | unsigned overhead; |
97 | ext4_fsblk_t metaend; | |
ac27a0ec | 98 | struct buffer_head *bh = NULL; |
3a5b2ecd | 99 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
100 | int err = -EINVAL; |
101 | ||
b302ef2d TT |
102 | if (group != sbi->s_groups_count) { |
103 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", | |
104 | input->group, sbi->s_groups_count); | |
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | overhead = ext4_group_overhead_blocks(sb, group); | |
109 | metaend = start + overhead; | |
d77147ff | 110 | input->free_clusters_count = free_blocks_count = |
ac27a0ec DK |
111 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
112 | ||
113 | if (test_opt(sb, DEBUG)) | |
617ba13b | 114 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 115 | "(%d free, %u reserved)\n", |
617ba13b | 116 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
117 | "no-super", input->group, input->blocks_count, |
118 | free_blocks_count, input->reserved_blocks); | |
119 | ||
3a5b2ecd | 120 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
b302ef2d | 121 | if (offset != 0) |
12062ddd | 122 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 123 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 124 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
125 | input->reserved_blocks); |
126 | else if (free_blocks_count < 0) | |
12062ddd | 127 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
128 | input->blocks_count); |
129 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 130 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
131 | end - 1); |
132 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 133 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 134 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 135 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 136 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 137 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 138 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 139 | outside(itend - 1, start, end)) |
12062ddd | 140 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 141 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 142 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 143 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 144 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 145 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
146 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
147 | "(%llu-%llu)", | |
1939e49a RD |
148 | (unsigned long long)input->block_bitmap, |
149 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 150 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
151 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
152 | "(%llu-%llu)", | |
1939e49a RD |
153 | (unsigned long long)input->inode_bitmap, |
154 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 155 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 156 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
157 | (unsigned long long)input->block_bitmap, |
158 | start, metaend - 1); | |
ac27a0ec | 159 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 160 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
161 | (unsigned long long)input->inode_bitmap, |
162 | start, metaend - 1); | |
ac27a0ec | 163 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 164 | inside(itend - 1, start, metaend)) |
12062ddd ES |
165 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
166 | "(%llu-%llu)", | |
1939e49a RD |
167 | (unsigned long long)input->inode_table, |
168 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
169 | else |
170 | err = 0; | |
171 | brelse(bh); | |
172 | ||
173 | return err; | |
174 | } | |
175 | ||
28c7bac0 YY |
176 | /* |
177 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
178 | * group each time. | |
179 | */ | |
180 | struct ext4_new_flex_group_data { | |
181 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
182 | in the flex group */ | |
183 | __u16 *bg_flags; /* block group flags of groups | |
184 | in @groups */ | |
185 | ext4_group_t count; /* number of groups in @groups | |
186 | */ | |
187 | }; | |
188 | ||
189 | /* | |
190 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
191 | * @flexbg_size. | |
192 | * | |
193 | * Returns NULL on failure otherwise address of the allocated structure. | |
194 | */ | |
195 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
196 | { | |
197 | struct ext4_new_flex_group_data *flex_gd; | |
198 | ||
199 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
200 | if (flex_gd == NULL) | |
201 | goto out3; | |
202 | ||
46901760 | 203 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) |
967ac8af | 204 | goto out2; |
28c7bac0 YY |
205 | flex_gd->count = flexbg_size; |
206 | ||
207 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
208 | flexbg_size, GFP_NOFS); | |
209 | if (flex_gd->groups == NULL) | |
210 | goto out2; | |
211 | ||
212 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
213 | if (flex_gd->bg_flags == NULL) | |
214 | goto out1; | |
215 | ||
216 | return flex_gd; | |
217 | ||
218 | out1: | |
219 | kfree(flex_gd->groups); | |
220 | out2: | |
221 | kfree(flex_gd); | |
222 | out3: | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
227 | { | |
228 | kfree(flex_gd->bg_flags); | |
229 | kfree(flex_gd->groups); | |
230 | kfree(flex_gd); | |
231 | } | |
232 | ||
3fbea4b3 YY |
233 | /* |
234 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
235 | * and inode tables for a flex group. | |
236 | * | |
237 | * This function is used by 64bit-resize. Note that this function allocates | |
238 | * group tables from the 1st group of groups contained by @flexgd, which may | |
239 | * be a partial of a flex group. | |
240 | * | |
241 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
242 | * |
243 | * Returns 0 on a successful allocation of the metadata blocks in the | |
244 | * block group. | |
3fbea4b3 | 245 | */ |
03c1c290 | 246 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
247 | struct ext4_new_flex_group_data *flex_gd, |
248 | int flexbg_size) | |
249 | { | |
250 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
251 | ext4_fsblk_t start_blk; |
252 | ext4_fsblk_t last_blk; | |
253 | ext4_group_t src_group; | |
254 | ext4_group_t bb_index = 0; | |
255 | ext4_group_t ib_index = 0; | |
256 | ext4_group_t it_index = 0; | |
257 | ext4_group_t group; | |
258 | ext4_group_t last_group; | |
259 | unsigned overhead; | |
b93c9535 | 260 | __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; |
d77147ff | 261 | int i; |
3fbea4b3 YY |
262 | |
263 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
264 | ||
265 | src_group = group_data[0].group; | |
266 | last_group = src_group + flex_gd->count - 1; | |
267 | ||
268 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
269 | (last_group & ~(flexbg_size - 1)))); | |
270 | next_group: | |
271 | group = group_data[0].group; | |
03c1c290 YY |
272 | if (src_group >= group_data[0].group + flex_gd->count) |
273 | return -ENOSPC; | |
3fbea4b3 YY |
274 | start_blk = ext4_group_first_block_no(sb, src_group); |
275 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
276 | ||
01f795f9 | 277 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
278 | |
279 | start_blk += overhead; | |
280 | ||
3fbea4b3 YY |
281 | /* We collect contiguous blocks as much as possible. */ |
282 | src_group++; | |
01f795f9 YY |
283 | for (; src_group <= last_group; src_group++) { |
284 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
b93c9535 | 285 | if (overhead == 0) |
3fbea4b3 YY |
286 | last_blk += group_data[src_group - group].blocks_count; |
287 | else | |
288 | break; | |
01f795f9 | 289 | } |
3fbea4b3 YY |
290 | |
291 | /* Allocate block bitmaps */ | |
292 | for (; bb_index < flex_gd->count; bb_index++) { | |
293 | if (start_blk >= last_blk) | |
294 | goto next_group; | |
295 | group_data[bb_index].block_bitmap = start_blk++; | |
bd86298e | 296 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 297 | group -= group_data[0].group; |
d77147ff | 298 | group_data[group].mdata_blocks++; |
b93c9535 | 299 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
300 | } |
301 | ||
302 | /* Allocate inode bitmaps */ | |
303 | for (; ib_index < flex_gd->count; ib_index++) { | |
304 | if (start_blk >= last_blk) | |
305 | goto next_group; | |
306 | group_data[ib_index].inode_bitmap = start_blk++; | |
bd86298e | 307 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 308 | group -= group_data[0].group; |
d77147ff | 309 | group_data[group].mdata_blocks++; |
b93c9535 | 310 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
311 | } |
312 | ||
313 | /* Allocate inode tables */ | |
314 | for (; it_index < flex_gd->count; it_index++) { | |
b93c9535 TT |
315 | unsigned int itb = EXT4_SB(sb)->s_itb_per_group; |
316 | ext4_fsblk_t next_group_start; | |
317 | ||
318 | if (start_blk + itb > last_blk) | |
3fbea4b3 YY |
319 | goto next_group; |
320 | group_data[it_index].inode_table = start_blk; | |
b93c9535 TT |
321 | group = ext4_get_group_number(sb, start_blk); |
322 | next_group_start = ext4_group_first_block_no(sb, group + 1); | |
3fbea4b3 | 323 | group -= group_data[0].group; |
3fbea4b3 | 324 | |
b93c9535 TT |
325 | if (start_blk + itb > next_group_start) { |
326 | flex_gd->bg_flags[group + 1] &= uninit_mask; | |
327 | overhead = start_blk + itb - next_group_start; | |
d77147ff | 328 | group_data[group + 1].mdata_blocks += overhead; |
b93c9535 TT |
329 | itb -= overhead; |
330 | } | |
331 | ||
d77147ff | 332 | group_data[group].mdata_blocks += itb; |
b93c9535 | 333 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
334 | start_blk += EXT4_SB(sb)->s_itb_per_group; |
335 | } | |
336 | ||
d77147ff | 337 | /* Update free clusters count to exclude metadata blocks */ |
338 | for (i = 0; i < flex_gd->count; i++) { | |
339 | group_data[i].free_clusters_count -= | |
340 | EXT4_NUM_B2C(EXT4_SB(sb), | |
341 | group_data[i].mdata_blocks); | |
342 | } | |
343 | ||
3fbea4b3 YY |
344 | if (test_opt(sb, DEBUG)) { |
345 | int i; | |
346 | group = group_data[0].group; | |
347 | ||
348 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
349 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
350 | flexbg_size); | |
351 | ||
352 | for (i = 0; i < flex_gd->count; i++) { | |
d77147ff | 353 | ext4_debug( |
354 | "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", | |
3fbea4b3 YY |
355 | ext4_bg_has_super(sb, group + i) ? "normal" : |
356 | "no-super", group + i, | |
357 | group_data[i].blocks_count, | |
d77147ff | 358 | group_data[i].free_clusters_count, |
359 | group_data[i].mdata_blocks); | |
3fbea4b3 YY |
360 | } |
361 | } | |
03c1c290 | 362 | return 0; |
3fbea4b3 YY |
363 | } |
364 | ||
ac27a0ec | 365 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 366 | ext4_fsblk_t blk) |
ac27a0ec DK |
367 | { |
368 | struct buffer_head *bh; | |
369 | int err; | |
370 | ||
371 | bh = sb_getblk(sb, blk); | |
aebf0243 | 372 | if (unlikely(!bh)) |
860d21e2 | 373 | return ERR_PTR(-ENOMEM); |
5d601255 | 374 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 375 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
376 | brelse(bh); |
377 | bh = ERR_PTR(err); | |
378 | } else { | |
ac27a0ec DK |
379 | memset(bh->b_data, 0, sb->s_blocksize); |
380 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
381 | } |
382 | ||
383 | return bh; | |
384 | } | |
385 | ||
14904107 ES |
386 | /* |
387 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
388 | * If that fails, restart the transaction & regain write access for the | |
389 | * buffer head which is used for block_bitmap modifications. | |
390 | */ | |
6d40bc5a | 391 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
392 | { |
393 | int err; | |
394 | ||
0390131b | 395 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
396 | return 0; |
397 | ||
398 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
399 | if (err < 0) | |
400 | return err; | |
401 | if (err) { | |
6d40bc5a YY |
402 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
403 | if (err) | |
14904107 | 404 | return err; |
2b2d6d01 | 405 | } |
14904107 ES |
406 | |
407 | return 0; | |
408 | } | |
409 | ||
33afdcc5 | 410 | /* |
d77147ff | 411 | * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. |
33afdcc5 YY |
412 | * |
413 | * Helper function for ext4_setup_new_group_blocks() which set . | |
414 | * | |
415 | * @sb: super block | |
416 | * @handle: journal handle | |
417 | * @flex_gd: flex group data | |
418 | */ | |
419 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
420 | struct ext4_new_flex_group_data *flex_gd, | |
d77147ff | 421 | ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) |
33afdcc5 | 422 | { |
d77147ff | 423 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
424 | ext4_group_t count = last_cluster - first_cluster + 1; | |
33afdcc5 YY |
425 | ext4_group_t count2; |
426 | ||
d77147ff | 427 | ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, |
428 | last_cluster); | |
429 | for (count2 = count; count > 0; | |
430 | count -= count2, first_cluster += count2) { | |
33afdcc5 YY |
431 | ext4_fsblk_t start; |
432 | struct buffer_head *bh; | |
433 | ext4_group_t group; | |
434 | int err; | |
435 | ||
d77147ff | 436 | group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); |
437 | start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); | |
33afdcc5 YY |
438 | group -= flex_gd->groups[0].group; |
439 | ||
d77147ff | 440 | count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); |
33afdcc5 YY |
441 | if (count2 > count) |
442 | count2 = count; | |
443 | ||
444 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
445 | BUG_ON(flex_gd->count > 1); | |
446 | continue; | |
447 | } | |
448 | ||
449 | err = extend_or_restart_transaction(handle, 1); | |
450 | if (err) | |
451 | return err; | |
452 | ||
453 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 454 | if (unlikely(!bh)) |
860d21e2 | 455 | return -ENOMEM; |
33afdcc5 | 456 | |
5d601255 | 457 | BUFFER_TRACE(bh, "get_write_access"); |
33afdcc5 YY |
458 | err = ext4_journal_get_write_access(handle, bh); |
459 | if (err) | |
460 | return err; | |
d77147ff | 461 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", |
462 | first_cluster, first_cluster - start, count2); | |
463 | ext4_set_bits(bh->b_data, first_cluster - start, count2); | |
33afdcc5 YY |
464 | |
465 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
466 | if (unlikely(err)) | |
467 | return err; | |
468 | brelse(bh); | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
476 | * This doesn't need to be part of the main transaction, since we are only | |
477 | * changing blocks outside the actual filesystem. We still do journaling to | |
478 | * ensure the recovery is correct in case of a failure just after resize. | |
479 | * If any part of this fails, we simply abort the resize. | |
480 | * | |
481 | * setup_new_flex_group_blocks handles a flex group as follow: | |
482 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
483 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
484 | * super block and GDT. | |
485 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
486 | * bitmap for blocks taken by group tables. | |
487 | */ | |
488 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
489 | struct ext4_new_flex_group_data *flex_gd) | |
490 | { | |
491 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
492 | ext4_fsblk_t start; | |
493 | ext4_fsblk_t block; | |
494 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
495 | struct ext4_super_block *es = sbi->s_es; | |
496 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
497 | __u16 *bg_flags = flex_gd->bg_flags; | |
498 | handle_t *handle; | |
499 | ext4_group_t group, count; | |
500 | struct buffer_head *bh = NULL; | |
501 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 502 | int meta_bg; |
33afdcc5 YY |
503 | |
504 | BUG_ON(!flex_gd->count || !group_data || | |
505 | group_data[0].group != sbi->s_groups_count); | |
506 | ||
507 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
e2b911c5 | 508 | meta_bg = ext4_has_feature_meta_bg(sb); |
33afdcc5 YY |
509 | |
510 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 511 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
512 | if (IS_ERR(handle)) |
513 | return PTR_ERR(handle); | |
514 | ||
515 | group = group_data[0].group; | |
516 | for (i = 0; i < flex_gd->count; i++, group++) { | |
517 | unsigned long gdblocks; | |
01f795f9 | 518 | ext4_grpblk_t overhead; |
33afdcc5 YY |
519 | |
520 | gdblocks = ext4_bg_num_gdb(sb, group); | |
521 | start = ext4_group_first_block_no(sb, group); | |
522 | ||
01f795f9 | 523 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
524 | goto handle_itb; |
525 | ||
01f795f9 YY |
526 | if (meta_bg == 1) { |
527 | ext4_group_t first_group; | |
528 | first_group = ext4_meta_bg_first_group(sb, group); | |
529 | if (first_group != group + 1 && | |
530 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
531 | goto handle_itb; | |
532 | } | |
533 | ||
534 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 535 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 536 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
537 | struct buffer_head *gdb; |
538 | ||
539 | ext4_debug("update backup group %#04llx\n", block); | |
540 | err = extend_or_restart_transaction(handle, 1); | |
541 | if (err) | |
542 | goto out; | |
543 | ||
544 | gdb = sb_getblk(sb, block); | |
aebf0243 | 545 | if (unlikely(!gdb)) { |
860d21e2 | 546 | err = -ENOMEM; |
33afdcc5 YY |
547 | goto out; |
548 | } | |
549 | ||
5d601255 | 550 | BUFFER_TRACE(gdb, "get_write_access"); |
33afdcc5 YY |
551 | err = ext4_journal_get_write_access(handle, gdb); |
552 | if (err) { | |
553 | brelse(gdb); | |
554 | goto out; | |
555 | } | |
556 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
557 | gdb->b_size); | |
558 | set_buffer_uptodate(gdb); | |
559 | ||
560 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
561 | if (unlikely(err)) { | |
562 | brelse(gdb); | |
563 | goto out; | |
564 | } | |
565 | brelse(gdb); | |
566 | } | |
567 | ||
568 | /* Zero out all of the reserved backup group descriptor | |
569 | * table blocks | |
570 | */ | |
571 | if (ext4_bg_has_super(sb, group)) { | |
572 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
573 | reserved_gdb, GFP_NOFS); | |
574 | if (err) | |
575 | goto out; | |
576 | } | |
577 | ||
6df935ad | 578 | handle_itb: |
33afdcc5 YY |
579 | /* Initialize group tables of the grop @group */ |
580 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
581 | goto handle_bb; | |
582 | ||
583 | /* Zero out all of the inode table blocks */ | |
584 | block = group_data[i].inode_table; | |
585 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
586 | block, sbi->s_itb_per_group); | |
587 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
588 | GFP_NOFS); | |
589 | if (err) | |
590 | goto out; | |
591 | ||
592 | handle_bb: | |
593 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
594 | goto handle_ib; | |
595 | ||
596 | /* Initialize block bitmap of the @group */ | |
597 | block = group_data[i].block_bitmap; | |
598 | err = extend_or_restart_transaction(handle, 1); | |
599 | if (err) | |
600 | goto out; | |
601 | ||
602 | bh = bclean(handle, sb, block); | |
603 | if (IS_ERR(bh)) { | |
604 | err = PTR_ERR(bh); | |
a9cfcd63 | 605 | bh = NULL; |
33afdcc5 YY |
606 | goto out; |
607 | } | |
01f795f9 YY |
608 | overhead = ext4_group_overhead_blocks(sb, group); |
609 | if (overhead != 0) { | |
33afdcc5 YY |
610 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
611 | start); | |
d77147ff | 612 | ext4_set_bits(bh->b_data, 0, |
613 | EXT4_NUM_B2C(sbi, overhead)); | |
33afdcc5 | 614 | } |
d77147ff | 615 | ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), |
33afdcc5 YY |
616 | sb->s_blocksize * 8, bh->b_data); |
617 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
618 | if (err) | |
619 | goto out; | |
620 | brelse(bh); | |
621 | ||
622 | handle_ib: | |
623 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
624 | continue; | |
625 | ||
626 | /* Initialize inode bitmap of the @group */ | |
627 | block = group_data[i].inode_bitmap; | |
628 | err = extend_or_restart_transaction(handle, 1); | |
629 | if (err) | |
630 | goto out; | |
631 | /* Mark unused entries in inode bitmap used */ | |
632 | bh = bclean(handle, sb, block); | |
633 | if (IS_ERR(bh)) { | |
634 | err = PTR_ERR(bh); | |
a9cfcd63 | 635 | bh = NULL; |
33afdcc5 YY |
636 | goto out; |
637 | } | |
638 | ||
639 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
640 | sb->s_blocksize * 8, bh->b_data); | |
641 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
642 | if (err) | |
643 | goto out; | |
644 | brelse(bh); | |
645 | } | |
646 | bh = NULL; | |
647 | ||
648 | /* Mark group tables in block bitmap */ | |
649 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
650 | count = group_table_count[j]; | |
651 | start = (&group_data[0].block_bitmap)[j]; | |
652 | block = start; | |
653 | for (i = 1; i < flex_gd->count; i++) { | |
654 | block += group_table_count[j]; | |
655 | if (block == (&group_data[i].block_bitmap)[j]) { | |
656 | count += group_table_count[j]; | |
657 | continue; | |
658 | } | |
659 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 660 | flex_gd, |
661 | EXT4_B2C(sbi, start), | |
662 | EXT4_B2C(sbi, | |
663 | start + count | |
664 | - 1)); | |
33afdcc5 YY |
665 | if (err) |
666 | goto out; | |
667 | count = group_table_count[j]; | |
b93c9535 | 668 | start = (&group_data[i].block_bitmap)[j]; |
33afdcc5 YY |
669 | block = start; |
670 | } | |
671 | ||
672 | if (count) { | |
673 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 674 | flex_gd, |
675 | EXT4_B2C(sbi, start), | |
676 | EXT4_B2C(sbi, | |
677 | start + count | |
678 | - 1)); | |
33afdcc5 YY |
679 | if (err) |
680 | goto out; | |
681 | } | |
682 | } | |
683 | ||
684 | out: | |
685 | brelse(bh); | |
686 | err2 = ext4_journal_stop(handle); | |
687 | if (err2 && !err) | |
688 | err = err2; | |
689 | ||
690 | return err; | |
691 | } | |
692 | ||
ac27a0ec DK |
693 | /* |
694 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 695 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
696 | * calling this for the first time. In a sparse filesystem it will be the |
697 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
698 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
699 | */ | |
617ba13b | 700 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
701 | unsigned *five, unsigned *seven) |
702 | { | |
703 | unsigned *min = three; | |
704 | int mult = 3; | |
705 | unsigned ret; | |
706 | ||
e2b911c5 | 707 | if (!ext4_has_feature_sparse_super(sb)) { |
ac27a0ec DK |
708 | ret = *min; |
709 | *min += 1; | |
710 | return ret; | |
711 | } | |
712 | ||
713 | if (*five < *min) { | |
714 | min = five; | |
715 | mult = 5; | |
716 | } | |
717 | if (*seven < *min) { | |
718 | min = seven; | |
719 | mult = 7; | |
720 | } | |
721 | ||
722 | ret = *min; | |
723 | *min *= mult; | |
724 | ||
725 | return ret; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
730 | * It is assumed that they are stored in group order. Returns the number of | |
731 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
732 | */ | |
733 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 734 | ext4_group_t end, |
ac27a0ec DK |
735 | struct buffer_head *primary) |
736 | { | |
617ba13b | 737 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
738 | unsigned three = 1; |
739 | unsigned five = 5; | |
740 | unsigned seven = 7; | |
741 | unsigned grp; | |
742 | __le32 *p = (__le32 *)primary->b_data; | |
743 | int gdbackups = 0; | |
744 | ||
617ba13b | 745 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
746 | if (le32_to_cpu(*p++) != |
747 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 748 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 749 | " missing grp %d (%llu)", |
ac27a0ec | 750 | blk, grp, |
bd81d8ee LV |
751 | grp * |
752 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
753 | blk); | |
ac27a0ec DK |
754 | return -EINVAL; |
755 | } | |
617ba13b | 756 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
757 | return -EFBIG; |
758 | } | |
759 | ||
760 | return gdbackups; | |
761 | } | |
762 | ||
763 | /* | |
764 | * Called when we need to bring a reserved group descriptor table block into | |
765 | * use from the resize inode. The primary copy of the new GDT block currently | |
766 | * is an indirect block (under the double indirect block in the resize inode). | |
767 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
768 | * block, in group order. Even though we know all the block numbers we need, | |
769 | * we check to ensure that the resize inode has actually reserved these blocks. | |
770 | * | |
771 | * Don't need to update the block bitmaps because the blocks are still in use. | |
772 | * | |
773 | * We get all of the error cases out of the way, so that we are sure to not | |
774 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
775 | */ | |
776 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 777 | ext4_group_t group) |
ac27a0ec DK |
778 | { |
779 | struct super_block *sb = inode->i_sb; | |
617ba13b | 780 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 781 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 782 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
783 | struct buffer_head **o_group_desc, **n_group_desc; |
784 | struct buffer_head *dind; | |
2f919710 | 785 | struct buffer_head *gdb_bh; |
ac27a0ec | 786 | int gdbackups; |
617ba13b | 787 | struct ext4_iloc iloc; |
ac27a0ec DK |
788 | __le32 *data; |
789 | int err; | |
790 | ||
791 | if (test_opt(sb, DEBUG)) | |
792 | printk(KERN_DEBUG | |
617ba13b | 793 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
794 | gdb_num); |
795 | ||
2f919710 YY |
796 | gdb_bh = sb_bread(sb, gdblock); |
797 | if (!gdb_bh) | |
ac27a0ec DK |
798 | return -EIO; |
799 | ||
c72df9f9 | 800 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 801 | if (gdbackups < 0) { |
ac27a0ec DK |
802 | err = gdbackups; |
803 | goto exit_bh; | |
804 | } | |
805 | ||
617ba13b | 806 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
807 | dind = sb_bread(sb, le32_to_cpu(*data)); |
808 | if (!dind) { | |
809 | err = -EIO; | |
810 | goto exit_bh; | |
811 | } | |
812 | ||
813 | data = (__le32 *)dind->b_data; | |
617ba13b | 814 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 815 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 816 | group, gdblock); |
ac27a0ec DK |
817 | err = -EINVAL; |
818 | goto exit_dind; | |
819 | } | |
820 | ||
5d601255 | 821 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
b4097142 TT |
822 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
823 | if (unlikely(err)) | |
ac27a0ec DK |
824 | goto exit_dind; |
825 | ||
5d601255 | 826 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
2f919710 | 827 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 828 | if (unlikely(err)) |
37be2f59 | 829 | goto exit_dind; |
ac27a0ec | 830 | |
5d601255 | 831 | BUFFER_TRACE(dind, "get_write_access"); |
b4097142 TT |
832 | err = ext4_journal_get_write_access(handle, dind); |
833 | if (unlikely(err)) | |
834 | ext4_std_error(sb, err); | |
ac27a0ec | 835 | |
617ba13b | 836 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
837 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
838 | if (unlikely(err)) | |
37be2f59 | 839 | goto exit_dind; |
ac27a0ec | 840 | |
f18a5f21 TT |
841 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
842 | sizeof(struct buffer_head *), | |
843 | GFP_NOFS); | |
ac27a0ec DK |
844 | if (!n_group_desc) { |
845 | err = -ENOMEM; | |
f18a5f21 TT |
846 | ext4_warning(sb, "not enough memory for %lu groups", |
847 | gdb_num + 1); | |
ac27a0ec DK |
848 | goto exit_inode; |
849 | } | |
850 | ||
851 | /* | |
852 | * Finally, we have all of the possible failures behind us... | |
853 | * | |
854 | * Remove new GDT block from inode double-indirect block and clear out | |
855 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
856 | * from the reserved inode). We don't need to change the bitmaps for | |
857 | * these blocks, because they are marked as in-use from being in the | |
858 | * reserved inode, and will become GDT blocks (primary and backup). | |
859 | */ | |
617ba13b | 860 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
861 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
862 | if (unlikely(err)) { | |
863 | ext4_std_error(sb, err); | |
864 | goto exit_inode; | |
865 | } | |
d77147ff | 866 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> |
867 | (9 - EXT4_SB(sb)->s_cluster_bits); | |
617ba13b | 868 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
869 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
870 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
871 | if (unlikely(err)) { |
872 | ext4_std_error(sb, err); | |
873 | goto exit_inode; | |
874 | } | |
875 | brelse(dind); | |
ac27a0ec | 876 | |
617ba13b | 877 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 878 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 879 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 880 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
881 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
882 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 883 | kvfree(o_group_desc); |
ac27a0ec | 884 | |
e8546d06 | 885 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 886 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
887 | if (err) |
888 | ext4_std_error(sb, err); | |
ac27a0ec | 889 | |
b4097142 | 890 | return err; |
ac27a0ec DK |
891 | |
892 | exit_inode: | |
b93b41d4 | 893 | kvfree(n_group_desc); |
ac27a0ec | 894 | brelse(iloc.bh); |
ac27a0ec DK |
895 | exit_dind: |
896 | brelse(dind); | |
897 | exit_bh: | |
2f919710 | 898 | brelse(gdb_bh); |
ac27a0ec | 899 | |
617ba13b | 900 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
901 | return err; |
902 | } | |
903 | ||
01f795f9 YY |
904 | /* |
905 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
906 | */ | |
907 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
908 | handle_t *handle, ext4_group_t group) { | |
909 | ext4_fsblk_t gdblock; | |
910 | struct buffer_head *gdb_bh; | |
911 | struct buffer_head **o_group_desc, **n_group_desc; | |
912 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
913 | int err; | |
914 | ||
915 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
916 | ext4_bg_has_super(sb, group); | |
917 | gdb_bh = sb_bread(sb, gdblock); | |
918 | if (!gdb_bh) | |
919 | return -EIO; | |
920 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * | |
921 | sizeof(struct buffer_head *), | |
922 | GFP_NOFS); | |
923 | if (!n_group_desc) { | |
924 | err = -ENOMEM; | |
925 | ext4_warning(sb, "not enough memory for %lu groups", | |
926 | gdb_num + 1); | |
927 | return err; | |
928 | } | |
929 | ||
930 | o_group_desc = EXT4_SB(sb)->s_group_desc; | |
931 | memcpy(n_group_desc, o_group_desc, | |
932 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
933 | n_group_desc[gdb_num] = gdb_bh; | |
934 | EXT4_SB(sb)->s_group_desc = n_group_desc; | |
935 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 936 | kvfree(o_group_desc); |
5d601255 | 937 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
01f795f9 YY |
938 | err = ext4_journal_get_write_access(handle, gdb_bh); |
939 | if (unlikely(err)) | |
940 | brelse(gdb_bh); | |
941 | return err; | |
942 | } | |
943 | ||
ac27a0ec DK |
944 | /* |
945 | * Called when we are adding a new group which has a backup copy of each of | |
946 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
947 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
948 | * that they are kept for future resizing and not allocated to files. | |
949 | * | |
950 | * Each reserved backup GDT block will go into a different indirect block. | |
951 | * The indirect blocks are actually the primary reserved GDT blocks, | |
952 | * so we know in advance what their block numbers are. We only get the | |
953 | * double-indirect block to verify it is pointing to the primary reserved | |
954 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
955 | * backup GDT blocks are stored in their reserved primary GDT block. | |
956 | */ | |
957 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 958 | ext4_group_t group) |
ac27a0ec DK |
959 | { |
960 | struct super_block *sb = inode->i_sb; | |
617ba13b | 961 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
d77147ff | 962 | int cluster_bits = EXT4_SB(sb)->s_cluster_bits; |
ac27a0ec DK |
963 | struct buffer_head **primary; |
964 | struct buffer_head *dind; | |
617ba13b MC |
965 | struct ext4_iloc iloc; |
966 | ext4_fsblk_t blk; | |
ac27a0ec DK |
967 | __le32 *data, *end; |
968 | int gdbackups = 0; | |
969 | int res, i; | |
970 | int err; | |
971 | ||
216553c4 | 972 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
973 | if (!primary) |
974 | return -ENOMEM; | |
975 | ||
617ba13b | 976 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
977 | dind = sb_bread(sb, le32_to_cpu(*data)); |
978 | if (!dind) { | |
979 | err = -EIO; | |
980 | goto exit_free; | |
981 | } | |
982 | ||
617ba13b | 983 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
984 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
985 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 986 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
987 | |
988 | /* Get each reserved primary GDT block and verify it holds backups */ | |
989 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
990 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 991 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
992 | " not at offset %ld", |
993 | blk, | |
994 | (long)(data - (__le32 *)dind->b_data)); | |
995 | err = -EINVAL; | |
996 | goto exit_bh; | |
997 | } | |
998 | primary[res] = sb_bread(sb, blk); | |
999 | if (!primary[res]) { | |
1000 | err = -EIO; | |
1001 | goto exit_bh; | |
1002 | } | |
c72df9f9 YY |
1003 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
1004 | if (gdbackups < 0) { | |
ac27a0ec DK |
1005 | brelse(primary[res]); |
1006 | err = gdbackups; | |
1007 | goto exit_bh; | |
1008 | } | |
1009 | if (++data >= end) | |
1010 | data = (__le32 *)dind->b_data; | |
1011 | } | |
1012 | ||
1013 | for (i = 0; i < reserved_gdb; i++) { | |
5d601255 | 1014 | BUFFER_TRACE(primary[i], "get_write_access"); |
37be2f59 | 1015 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 1016 | goto exit_bh; |
ac27a0ec DK |
1017 | } |
1018 | ||
617ba13b | 1019 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
1020 | goto exit_bh; |
1021 | ||
1022 | /* | |
1023 | * Finally we can add each of the reserved backup GDT blocks from | |
1024 | * the new group to its reserved primary GDT block. | |
1025 | */ | |
668f4dc5 | 1026 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1027 | for (i = 0; i < reserved_gdb; i++) { |
1028 | int err2; | |
1029 | data = (__le32 *)primary[i]->b_data; | |
1030 | /* printk("reserving backup %lu[%u] = %lu\n", | |
1031 | primary[i]->b_blocknr, gdbackups, | |
1032 | blk + primary[i]->b_blocknr); */ | |
1033 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 1034 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
1035 | if (!err) |
1036 | err = err2; | |
1037 | } | |
d77147ff | 1038 | |
1039 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); | |
617ba13b | 1040 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
1041 | |
1042 | exit_bh: | |
1043 | while (--res >= 0) | |
1044 | brelse(primary[res]); | |
1045 | brelse(dind); | |
1046 | ||
1047 | exit_free: | |
1048 | kfree(primary); | |
1049 | ||
1050 | return err; | |
1051 | } | |
1052 | ||
1053 | /* | |
617ba13b | 1054 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1055 | * of the main resize transaction, because e2fsck will re-write them if there |
1056 | * is a problem (basically only OOM will cause a problem). However, we | |
1057 | * _should_ update the backups if possible, in case the primary gets trashed | |
1058 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1059 | * important part is that the new block and inode counts are in the backup | |
1060 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1061 | * | |
32ed5058 TT |
1062 | * We do not need take the s_resize_lock for this, because these |
1063 | * blocks are not otherwise touched by the filesystem code when it is | |
1064 | * mounted. We don't need to worry about last changing from | |
1065 | * sbi->s_groups_count, because the worst that can happen is that we | |
1066 | * do not copy the full number of backups at this time. The resize | |
1067 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1068 | */ |
904dad47 | 1069 | static void update_backups(struct super_block *sb, sector_t blk_off, char *data, |
01f795f9 | 1070 | int size, int meta_bg) |
ac27a0ec | 1071 | { |
617ba13b | 1072 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1073 | ext4_group_t last; |
617ba13b | 1074 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1075 | unsigned three = 1; |
1076 | unsigned five = 5; | |
1077 | unsigned seven = 7; | |
01f795f9 | 1078 | ext4_group_t group = 0; |
ac27a0ec DK |
1079 | int rest = sb->s_blocksize - size; |
1080 | handle_t *handle; | |
1081 | int err = 0, err2; | |
1082 | ||
9924a92a | 1083 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1084 | if (IS_ERR(handle)) { |
1085 | group = 1; | |
1086 | err = PTR_ERR(handle); | |
1087 | goto exit_err; | |
1088 | } | |
1089 | ||
01f795f9 YY |
1090 | if (meta_bg == 0) { |
1091 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1092 | last = sbi->s_groups_count; | |
1093 | } else { | |
904dad47 | 1094 | group = ext4_get_group_number(sb, blk_off) + 1; |
01f795f9 YY |
1095 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); |
1096 | } | |
1097 | ||
1098 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1099 | struct buffer_head *bh; |
01f795f9 | 1100 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1101 | |
1102 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1103 | if (ext4_handle_valid(handle) && |
1104 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1105 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1106 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1107 | break; |
1108 | ||
01f795f9 | 1109 | if (meta_bg == 0) |
9378c676 | 1110 | backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; |
01f795f9 YY |
1111 | else |
1112 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1113 | ext4_bg_has_super(sb, group)); | |
1114 | ||
1115 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1116 | if (unlikely(!bh)) { |
860d21e2 | 1117 | err = -ENOMEM; |
ac27a0ec DK |
1118 | break; |
1119 | } | |
01f795f9 YY |
1120 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1121 | backup_block, backup_block - | |
1122 | ext4_group_first_block_no(sb, group)); | |
5d601255 | 1123 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 1124 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1125 | break; |
1126 | lock_buffer(bh); | |
1127 | memcpy(bh->b_data, data, size); | |
1128 | if (rest) | |
1129 | memset(bh->b_data + size, 0, rest); | |
1130 | set_buffer_uptodate(bh); | |
1131 | unlock_buffer(bh); | |
b4097142 TT |
1132 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1133 | if (unlikely(err)) | |
1134 | ext4_std_error(sb, err); | |
ac27a0ec | 1135 | brelse(bh); |
01f795f9 YY |
1136 | |
1137 | if (meta_bg == 0) | |
1138 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1139 | else if (group == last) | |
1140 | break; | |
1141 | else | |
1142 | group = last; | |
ac27a0ec | 1143 | } |
617ba13b | 1144 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1145 | err = err2; |
1146 | ||
1147 | /* | |
1148 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1149 | * late to revert the resize, we shouldn't fail just because of | |
1150 | * the backup copies (they are only needed in case of corruption). | |
1151 | * | |
1152 | * However, if we got here we have a journal problem too, so we | |
1153 | * can't really start a transaction to mark the superblock. | |
1154 | * Chicken out and just set the flag on the hope it will be written | |
1155 | * to disk, and if not - we will simply wait until next fsck. | |
1156 | */ | |
1157 | exit_err: | |
1158 | if (err) { | |
12062ddd | 1159 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1160 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1161 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1162 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1163 | mark_buffer_dirty(sbi->s_sbh); |
1164 | } | |
1165 | } | |
1166 | ||
bb08c1e7 YY |
1167 | /* |
1168 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1169 | * starting at @group | |
1170 | * | |
1171 | * @handle: journal handle | |
1172 | * @sb: super block | |
1173 | * @group: the group no. of the first group desc to be added | |
1174 | * @resize_inode: the resize inode | |
1175 | * @count: number of group descriptors to be added | |
1176 | */ | |
1177 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1178 | ext4_group_t group, struct inode *resize_inode, | |
1179 | ext4_group_t count) | |
1180 | { | |
1181 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1182 | struct ext4_super_block *es = sbi->s_es; | |
1183 | struct buffer_head *gdb_bh; | |
1184 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1185 | int meta_bg; |
bb08c1e7 | 1186 | |
e2b911c5 | 1187 | meta_bg = ext4_has_feature_meta_bg(sb); |
bb08c1e7 YY |
1188 | for (i = 0; i < count; i++, group++) { |
1189 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1190 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1191 | ||
1192 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1193 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1194 | ||
1195 | /* | |
1196 | * We will only either add reserved group blocks to a backup group | |
1197 | * or remove reserved blocks for the first group in a new group block. | |
1198 | * Doing both would be mean more complex code, and sane people don't | |
1199 | * use non-sparse filesystems anymore. This is already checked above. | |
1200 | */ | |
1201 | if (gdb_off) { | |
1202 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
5d601255 | 1203 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
bb08c1e7 YY |
1204 | err = ext4_journal_get_write_access(handle, gdb_bh); |
1205 | ||
1206 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1207 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1208 | } else if (meta_bg != 0) { |
1209 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1210 | } else { | |
bb08c1e7 | 1211 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1212 | } |
bb08c1e7 YY |
1213 | if (err) |
1214 | break; | |
1215 | } | |
1216 | return err; | |
1217 | } | |
1218 | ||
41a246d1 DW |
1219 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1220 | { | |
1221 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1222 | if (unlikely(!bh)) |
41a246d1 | 1223 | return NULL; |
7f1468d1 DM |
1224 | if (!bh_uptodate_or_lock(bh)) { |
1225 | if (bh_submit_read(bh) < 0) { | |
1226 | brelse(bh); | |
1227 | return NULL; | |
1228 | } | |
41a246d1 | 1229 | } |
41a246d1 DW |
1230 | |
1231 | return bh; | |
1232 | } | |
1233 | ||
1234 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1235 | ext4_group_t group, | |
1236 | struct ext4_group_desc *gdp, | |
1237 | struct ext4_new_group_data *group_data) | |
1238 | { | |
1239 | struct buffer_head *bh; | |
1240 | ||
9aa5d32b | 1241 | if (!ext4_has_metadata_csum(sb)) |
41a246d1 DW |
1242 | return 0; |
1243 | ||
1244 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1245 | if (!bh) | |
1246 | return -EIO; | |
1247 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1248 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1249 | brelse(bh); | |
1250 | ||
fa77dcfa DW |
1251 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1252 | if (!bh) | |
1253 | return -EIO; | |
79f1ba49 | 1254 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1255 | brelse(bh); |
1256 | ||
41a246d1 DW |
1257 | return 0; |
1258 | } | |
1259 | ||
083f5b24 YY |
1260 | /* |
1261 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1262 | */ | |
1263 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1264 | struct ext4_new_flex_group_data *flex_gd) | |
1265 | { | |
1266 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1267 | struct ext4_group_desc *gdp; | |
1268 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1269 | struct buffer_head *gdb_bh; | |
1270 | ext4_group_t group; | |
1271 | __u16 *bg_flags = flex_gd->bg_flags; | |
1272 | int i, gdb_off, gdb_num, err = 0; | |
d77147ff | 1273 | |
083f5b24 YY |
1274 | |
1275 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1276 | group = group_data->group; | |
1277 | ||
1278 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1279 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1280 | ||
1281 | /* | |
1282 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1283 | */ | |
1284 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1285 | /* Update group descriptor block for new group */ | |
2716b802 | 1286 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1287 | gdb_off * EXT4_DESC_SIZE(sb)); |
1288 | ||
1289 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1290 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1291 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1292 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1293 | if (err) { | |
1294 | ext4_std_error(sb, err); | |
1295 | break; | |
1296 | } | |
1297 | ||
083f5b24 YY |
1298 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1299 | ext4_free_group_clusters_set(sb, gdp, | |
d77147ff | 1300 | group_data->free_clusters_count); |
083f5b24 | 1301 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1302 | if (ext4_has_group_desc_csum(sb)) |
1303 | ext4_itable_unused_set(sb, gdp, | |
1304 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1305 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1306 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1307 | |
1308 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1309 | if (unlikely(err)) { | |
1310 | ext4_std_error(sb, err); | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * We can allocate memory for mb_alloc based on the new group | |
1316 | * descriptor | |
1317 | */ | |
1318 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1319 | if (err) | |
1320 | break; | |
1321 | } | |
1322 | return err; | |
1323 | } | |
1324 | ||
2e10e2f2 YY |
1325 | /* |
1326 | * ext4_update_super() updates the super block so that the newly added | |
1327 | * groups can be seen by the filesystem. | |
1328 | * | |
1329 | * @sb: super block | |
1330 | * @flex_gd: new added groups | |
1331 | */ | |
1332 | static void ext4_update_super(struct super_block *sb, | |
1333 | struct ext4_new_flex_group_data *flex_gd) | |
1334 | { | |
1335 | ext4_fsblk_t blocks_count = 0; | |
1336 | ext4_fsblk_t free_blocks = 0; | |
1337 | ext4_fsblk_t reserved_blocks = 0; | |
1338 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1339 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1340 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1341 | int i; |
2e10e2f2 YY |
1342 | |
1343 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1344 | /* | |
1345 | * Make the new blocks and inodes valid next. We do this before | |
1346 | * increasing the group count so that once the group is enabled, | |
1347 | * all of its blocks and inodes are already valid. | |
1348 | * | |
1349 | * We always allocate group-by-group, then block-by-block or | |
1350 | * inode-by-inode within a group, so enabling these | |
1351 | * blocks/inodes before the group is live won't actually let us | |
1352 | * allocate the new space yet. | |
1353 | */ | |
1354 | for (i = 0; i < flex_gd->count; i++) { | |
1355 | blocks_count += group_data[i].blocks_count; | |
d77147ff | 1356 | free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); |
2e10e2f2 YY |
1357 | } |
1358 | ||
1359 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1360 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1361 | reserved_blocks *= blocks_count; |
1362 | do_div(reserved_blocks, 100); | |
1363 | ||
1364 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1365 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1366 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1367 | flex_gd->count); | |
636d7e2e DW |
1368 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1369 | flex_gd->count); | |
2e10e2f2 | 1370 | |
01f795f9 | 1371 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1372 | /* |
1373 | * We need to protect s_groups_count against other CPUs seeing | |
1374 | * inconsistent state in the superblock. | |
1375 | * | |
1376 | * The precise rules we use are: | |
1377 | * | |
1378 | * * Writers must perform a smp_wmb() after updating all | |
1379 | * dependent data and before modifying the groups count | |
1380 | * | |
1381 | * * Readers must perform an smp_rmb() after reading the groups | |
1382 | * count and before reading any dependent data. | |
1383 | * | |
1384 | * NB. These rules can be relaxed when checking the group count | |
1385 | * while freeing data, as we can only allocate from a block | |
1386 | * group after serialising against the group count, and we can | |
1387 | * only then free after serialising in turn against that | |
1388 | * allocation. | |
1389 | */ | |
1390 | smp_wmb(); | |
1391 | ||
1392 | /* Update the global fs size fields */ | |
1393 | sbi->s_groups_count += flex_gd->count; | |
c5c72d81 TT |
1394 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
1395 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
2e10e2f2 YY |
1396 | |
1397 | /* Update the reserved block counts only once the new group is | |
1398 | * active. */ | |
1399 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1400 | reserved_blocks); | |
1401 | ||
1402 | /* Update the free space counts */ | |
1403 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1404 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1405 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1406 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1407 | ||
01f795f9 YY |
1408 | ext4_debug("free blocks count %llu", |
1409 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
e2b911c5 | 1410 | if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { |
2e10e2f2 YY |
1411 | ext4_group_t flex_group; |
1412 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
90ba983f TT |
1413 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
1414 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2e10e2f2 YY |
1415 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
1416 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1417 | } | |
1418 | ||
952fc18e TT |
1419 | /* |
1420 | * Update the fs overhead information | |
1421 | */ | |
1422 | ext4_calculate_overhead(sb); | |
1423 | ||
2e10e2f2 YY |
1424 | if (test_opt(sb, DEBUG)) |
1425 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1426 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1427 | blocks_count, free_blocks, reserved_blocks); | |
1428 | } | |
1429 | ||
4bac1f8c YY |
1430 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1431 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1432 | * transaction and not have it write the data to disk. | |
1433 | */ | |
1434 | static int ext4_flex_group_add(struct super_block *sb, | |
1435 | struct inode *resize_inode, | |
1436 | struct ext4_new_flex_group_data *flex_gd) | |
1437 | { | |
1438 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1439 | struct ext4_super_block *es = sbi->s_es; | |
1440 | ext4_fsblk_t o_blocks_count; | |
1441 | ext4_grpblk_t last; | |
1442 | ext4_group_t group; | |
1443 | handle_t *handle; | |
1444 | unsigned reserved_gdb; | |
1445 | int err = 0, err2 = 0, credit; | |
1446 | ||
1447 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1448 | ||
1449 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1450 | o_blocks_count = ext4_blocks_count(es); | |
1451 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1452 | BUG_ON(last); | |
1453 | ||
1454 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1455 | if (err) | |
1456 | goto exit; | |
1457 | /* | |
1458 | * We will always be modifying at least the superblock and GDT | |
2c869b26 | 1459 | * blocks. If we are adding a group past the last current GDT block, |
4bac1f8c YY |
1460 | * we will also modify the inode and the dindirect block. If we |
1461 | * are adding a group with superblock/GDT backups we will also | |
1462 | * modify each of the reserved GDT dindirect blocks. | |
1463 | */ | |
2c869b26 JK |
1464 | credit = 3; /* sb, resize inode, resize inode dindirect */ |
1465 | /* GDT blocks */ | |
1466 | credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); | |
1467 | credit += reserved_gdb; /* Reserved GDT dindirect blocks */ | |
9924a92a | 1468 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1469 | if (IS_ERR(handle)) { |
1470 | err = PTR_ERR(handle); | |
1471 | goto exit; | |
1472 | } | |
1473 | ||
5d601255 | 1474 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
4bac1f8c YY |
1475 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1476 | if (err) | |
1477 | goto exit_journal; | |
1478 | ||
1479 | group = flex_gd->groups[0].group; | |
49598e04 | 1480 | BUG_ON(group != sbi->s_groups_count); |
4bac1f8c YY |
1481 | err = ext4_add_new_descs(handle, sb, group, |
1482 | resize_inode, flex_gd->count); | |
1483 | if (err) | |
1484 | goto exit_journal; | |
1485 | ||
1486 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1487 | if (err) | |
1488 | goto exit_journal; | |
1489 | ||
1490 | ext4_update_super(sb, flex_gd); | |
1491 | ||
1492 | err = ext4_handle_dirty_super(handle, sb); | |
1493 | ||
1494 | exit_journal: | |
1495 | err2 = ext4_journal_stop(handle); | |
1496 | if (!err) | |
1497 | err = err2; | |
1498 | ||
1499 | if (!err) { | |
2ebd1704 YY |
1500 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1501 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1502 | EXT4_DESC_PER_BLOCK(sb)); | |
e2b911c5 | 1503 | int meta_bg = ext4_has_feature_meta_bg(sb); |
0acdb887 | 1504 | sector_t old_gdb = 0; |
2ebd1704 | 1505 | |
4bac1f8c | 1506 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1507 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1508 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1509 | struct buffer_head *gdb_bh; |
2ebd1704 | 1510 | |
4bac1f8c | 1511 | gdb_bh = sbi->s_group_desc[gdb_num]; |
0acdb887 TM |
1512 | if (old_gdb == gdb_bh->b_blocknr) |
1513 | continue; | |
4bac1f8c | 1514 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1515 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1516 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1517 | } |
1518 | } | |
1519 | exit: | |
1520 | return err; | |
1521 | } | |
1522 | ||
19c5246d YY |
1523 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1524 | struct ext4_new_flex_group_data *flex_gd, | |
1525 | ext4_fsblk_t n_blocks_count, | |
1526 | unsigned long flexbg_size) | |
1527 | { | |
d77147ff | 1528 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1529 | struct ext4_super_block *es = sbi->s_es; | |
19c5246d YY |
1530 | struct ext4_new_group_data *group_data = flex_gd->groups; |
1531 | ext4_fsblk_t o_blocks_count; | |
1532 | ext4_group_t n_group; | |
1533 | ext4_group_t group; | |
1534 | ext4_group_t last_group; | |
1535 | ext4_grpblk_t last; | |
d77147ff | 1536 | ext4_grpblk_t clusters_per_group; |
19c5246d YY |
1537 | unsigned long i; |
1538 | ||
d77147ff | 1539 | clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); |
19c5246d YY |
1540 | |
1541 | o_blocks_count = ext4_blocks_count(es); | |
1542 | ||
1543 | if (o_blocks_count == n_blocks_count) | |
1544 | return 0; | |
1545 | ||
1546 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1547 | BUG_ON(last); | |
1548 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1549 | ||
1550 | last_group = group | (flexbg_size - 1); | |
1551 | if (last_group > n_group) | |
1552 | last_group = n_group; | |
1553 | ||
1554 | flex_gd->count = last_group - group + 1; | |
1555 | ||
1556 | for (i = 0; i < flex_gd->count; i++) { | |
1557 | int overhead; | |
1558 | ||
1559 | group_data[i].group = group + i; | |
d77147ff | 1560 | group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); |
01f795f9 | 1561 | overhead = ext4_group_overhead_blocks(sb, group + i); |
d77147ff | 1562 | group_data[i].mdata_blocks = overhead; |
1563 | group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); | |
7f511862 | 1564 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1565 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1566 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1567 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1568 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1569 | } else | |
19c5246d YY |
1570 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1571 | } | |
1572 | ||
feb0ab32 | 1573 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1574 | /* We need to initialize block bitmap of last group. */ |
1575 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1576 | ||
d77147ff | 1577 | if ((last_group == n_group) && (last != clusters_per_group - 1)) { |
1578 | group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); | |
1579 | group_data[i - 1].free_clusters_count -= clusters_per_group - | |
1580 | last - 1; | |
19c5246d YY |
1581 | } |
1582 | ||
1583 | return 1; | |
1584 | } | |
1585 | ||
ac27a0ec DK |
1586 | /* Add group descriptor data to an existing or new group descriptor block. |
1587 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1588 | * the filesystem, because we cannot abort the transaction and not have it | |
1589 | * write the data to disk. | |
1590 | * | |
1591 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1592 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1593 | * | |
1594 | * We only need to hold the superblock lock while we are actually adding | |
1595 | * in the new group's counts to the superblock. Prior to that we have | |
1596 | * not really "added" the group at all. We re-check that we are still | |
1597 | * adding in the last group in case things have changed since verifying. | |
1598 | */ | |
617ba13b | 1599 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1600 | { |
61f296cc | 1601 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1602 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1603 | struct ext4_super_block *es = sbi->s_es; | |
1604 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1605 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1606 | struct inode *inode = NULL; |
03b40e34 | 1607 | int gdb_off; |
61f296cc YY |
1608 | int err; |
1609 | __u16 bg_flags = 0; | |
ac27a0ec | 1610 | |
617ba13b | 1611 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
ac27a0ec | 1612 | |
e2b911c5 | 1613 | if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { |
12062ddd | 1614 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1615 | return -EPERM; |
1616 | } | |
1617 | ||
bd81d8ee LV |
1618 | if (ext4_blocks_count(es) + input->blocks_count < |
1619 | ext4_blocks_count(es)) { | |
12062ddd | 1620 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1621 | return -EINVAL; |
1622 | } | |
1623 | ||
617ba13b | 1624 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1625 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1626 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1627 | return -EINVAL; |
1628 | } | |
1629 | ||
1630 | if (reserved_gdb || gdb_off == 0) { | |
e2b911c5 DW |
1631 | if (ext4_has_feature_resize_inode(sb) || |
1632 | !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1633 | ext4_warning(sb, |
ac27a0ec DK |
1634 | "No reserved GDT blocks, can't resize"); |
1635 | return -EPERM; | |
1636 | } | |
1d1fe1ee DH |
1637 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1638 | if (IS_ERR(inode)) { | |
12062ddd | 1639 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1640 | return PTR_ERR(inode); |
ac27a0ec DK |
1641 | } |
1642 | } | |
1643 | ||
920313a7 | 1644 | |
61f296cc | 1645 | err = verify_group_input(sb, input); |
08c3a813 | 1646 | if (err) |
61f296cc | 1647 | goto out; |
ac27a0ec | 1648 | |
117fff10 TT |
1649 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1650 | if (err) | |
7f511862 | 1651 | goto out; |
117fff10 | 1652 | |
28623c2f TT |
1653 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1654 | if (err) | |
1655 | goto out; | |
1656 | ||
61f296cc YY |
1657 | flex_gd.count = 1; |
1658 | flex_gd.groups = input; | |
1659 | flex_gd.bg_flags = &bg_flags; | |
1660 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1661 | out: | |
ac27a0ec DK |
1662 | iput(inode); |
1663 | return err; | |
617ba13b | 1664 | } /* ext4_group_add */ |
ac27a0ec | 1665 | |
18e31438 YY |
1666 | /* |
1667 | * extend a group without checking assuming that checking has been done. | |
1668 | */ | |
1669 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1670 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1671 | { | |
1672 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1673 | handle_t *handle; | |
1674 | int err = 0, err2; | |
1675 | ||
1676 | /* We will update the superblock, one block bitmap, and | |
1677 | * one group descriptor via ext4_group_add_blocks(). | |
1678 | */ | |
9924a92a | 1679 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1680 | if (IS_ERR(handle)) { |
1681 | err = PTR_ERR(handle); | |
1682 | ext4_warning(sb, "error %d on journal start", err); | |
1683 | return err; | |
1684 | } | |
1685 | ||
5d601255 | 1686 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
18e31438 YY |
1687 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
1688 | if (err) { | |
1689 | ext4_warning(sb, "error %d on journal write access", err); | |
1690 | goto errout; | |
1691 | } | |
1692 | ||
1693 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1694 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1695 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1696 | o_blocks_count + add); | |
1697 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1698 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1699 | if (err) | |
1700 | goto errout; | |
1701 | ext4_handle_dirty_super(handle, sb); | |
1702 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1703 | o_blocks_count + add); | |
1704 | errout: | |
1705 | err2 = ext4_journal_stop(handle); | |
1706 | if (err2 && !err) | |
1707 | err = err2; | |
1708 | ||
1709 | if (!err) { | |
1710 | if (test_opt(sb, DEBUG)) | |
1711 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1712 | "blocks\n", ext4_blocks_count(es)); | |
6ca792ed | 1713 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
01f795f9 | 1714 | (char *)es, sizeof(struct ext4_super_block), 0); |
18e31438 YY |
1715 | } |
1716 | return err; | |
1717 | } | |
1718 | ||
2b2d6d01 TT |
1719 | /* |
1720 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1721 | * point is only used to extend the current filesystem to the end of the last |
1722 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1723 | * for emergencies (because it has no dependencies on reserved blocks). | |
1724 | * | |
617ba13b | 1725 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1726 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1727 | * GDT blocks are reserved to grow to the desired size. | |
1728 | */ | |
617ba13b MC |
1729 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1730 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1731 | { |
617ba13b | 1732 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1733 | ext4_grpblk_t last; |
1734 | ext4_grpblk_t add; | |
af5bc92d | 1735 | struct buffer_head *bh; |
d89651c8 | 1736 | int err; |
5f21b0e6 | 1737 | ext4_group_t group; |
ac27a0ec | 1738 | |
bd81d8ee | 1739 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1740 | |
1741 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1742 | ext4_msg(sb, KERN_DEBUG, |
1743 | "extending last group from %llu to %llu blocks", | |
1744 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1745 | |
1746 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1747 | return 0; | |
1748 | ||
1749 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1750 | ext4_msg(sb, KERN_ERR, |
1751 | "filesystem too large to resize to %llu blocks safely", | |
1752 | n_blocks_count); | |
ac27a0ec | 1753 | if (sizeof(sector_t) < 8) |
12062ddd | 1754 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1755 | return -EINVAL; |
1756 | } | |
1757 | ||
1758 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1759 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1760 | return -EINVAL; |
ac27a0ec DK |
1761 | } |
1762 | ||
1763 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1764 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1765 | |
1766 | if (last == 0) { | |
12062ddd | 1767 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1768 | return -EPERM; |
1769 | } | |
1770 | ||
617ba13b | 1771 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1772 | |
1773 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1774 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1775 | return -EINVAL; |
1776 | } | |
1777 | ||
1778 | if (o_blocks_count + add > n_blocks_count) | |
1779 | add = n_blocks_count - o_blocks_count; | |
1780 | ||
1781 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1782 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1783 | o_blocks_count + add, add); |
1784 | ||
1785 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1786 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1787 | if (!bh) { |
12062ddd | 1788 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1789 | return -ENOSPC; |
1790 | } | |
1791 | brelse(bh); | |
1792 | ||
d89651c8 | 1793 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1794 | return err; |
617ba13b | 1795 | } /* ext4_group_extend */ |
19c5246d | 1796 | |
1c6bd717 TT |
1797 | |
1798 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1799 | { | |
1800 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1801 | } | |
1802 | ||
1803 | /* | |
1804 | * Release the resize inode and drop the resize_inode feature if there | |
1805 | * are no more reserved gdt blocks, and then convert the file system | |
1806 | * to enable meta_bg | |
1807 | */ | |
1808 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1809 | { | |
1810 | handle_t *handle; | |
1811 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1812 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1813 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1814 | ext4_fsblk_t nr; |
1815 | int i, ret, err = 0; | |
1816 | int credits = 1; | |
1817 | ||
1818 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1819 | if (inode) { |
1c6bd717 TT |
1820 | if (es->s_reserved_gdt_blocks) { |
1821 | ext4_error(sb, "Unexpected non-zero " | |
1822 | "s_reserved_gdt_blocks"); | |
1823 | return -EPERM; | |
1824 | } | |
1c6bd717 TT |
1825 | |
1826 | /* Do a quick sanity check of the resize inode */ | |
d77147ff | 1827 | if (inode->i_blocks != 1 << (inode->i_blkbits - |
1828 | (9 - sbi->s_cluster_bits))) | |
1c6bd717 TT |
1829 | goto invalid_resize_inode; |
1830 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1831 | if (i == EXT4_DIND_BLOCK) { | |
1832 | if (ei->i_data[i]) | |
1833 | continue; | |
1834 | else | |
1835 | goto invalid_resize_inode; | |
1836 | } | |
1837 | if (ei->i_data[i]) | |
1838 | goto invalid_resize_inode; | |
1839 | } | |
1840 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1841 | } | |
1842 | ||
9924a92a | 1843 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1844 | if (IS_ERR(handle)) |
1845 | return PTR_ERR(handle); | |
1846 | ||
5d601255 | 1847 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
1c6bd717 TT |
1848 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1849 | if (err) | |
1850 | goto errout; | |
1851 | ||
e2b911c5 DW |
1852 | ext4_clear_feature_resize_inode(sb); |
1853 | ext4_set_feature_meta_bg(sb); | |
1c6bd717 TT |
1854 | sbi->s_es->s_first_meta_bg = |
1855 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
1856 | ||
1857 | err = ext4_handle_dirty_super(handle, sb); | |
1858 | if (err) { | |
1859 | ext4_std_error(sb, err); | |
1860 | goto errout; | |
1861 | } | |
1862 | ||
1863 | if (inode) { | |
1864 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1865 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1866 | EXT4_FREE_BLOCKS_METADATA | | |
1867 | EXT4_FREE_BLOCKS_FORGET); | |
1868 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1869 | inode->i_blocks = 0; | |
1870 | ||
1871 | err = ext4_mark_inode_dirty(handle, inode); | |
1872 | if (err) | |
1873 | ext4_std_error(sb, err); | |
1874 | } | |
1875 | ||
1876 | errout: | |
1877 | ret = ext4_journal_stop(handle); | |
1878 | if (!err) | |
1879 | err = ret; | |
1880 | return ret; | |
1881 | ||
1882 | invalid_resize_inode: | |
1883 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1884 | return -EINVAL; | |
1885 | } | |
1886 | ||
19c5246d YY |
1887 | /* |
1888 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1889 | * | |
1890 | * @sb: super block of the fs to be resized | |
1891 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1892 | */ | |
1893 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1894 | { | |
1895 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1896 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1897 | struct ext4_super_block *es = sbi->s_es; | |
1898 | struct buffer_head *bh; | |
01f795f9 YY |
1899 | struct inode *resize_inode = NULL; |
1900 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1901 | unsigned long n_desc_blocks; |
1902 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1903 | ext4_group_t o_group; |
1904 | ext4_group_t n_group; | |
1905 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1906 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1907 | unsigned long last_update_time = 0; |
117fff10 | 1908 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1909 | int meta_bg; |
19c5246d | 1910 | |
59e31c15 TT |
1911 | /* See if the device is actually as big as what was requested */ |
1912 | bh = sb_bread(sb, n_blocks_count - 1); | |
1913 | if (!bh) { | |
1914 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1915 | return -ENOSPC; | |
1916 | } | |
1917 | brelse(bh); | |
1918 | ||
1c6bd717 | 1919 | retry: |
19c5246d YY |
1920 | o_blocks_count = ext4_blocks_count(es); |
1921 | ||
59e31c15 TT |
1922 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1923 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1924 | |
1925 | if (n_blocks_count < o_blocks_count) { | |
1926 | /* On-line shrinking not supported */ | |
1927 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1928 | return -EINVAL; | |
1929 | } | |
1930 | ||
1931 | if (n_blocks_count == o_blocks_count) | |
1932 | /* Nothing need to do */ | |
1933 | return 0; | |
1934 | ||
bd86298e | 1935 | n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
4f2f76f7 | 1936 | if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
3f8a6411 TT |
1937 | ext4_warning(sb, "resize would cause inodes_count overflow"); |
1938 | return -EINVAL; | |
1939 | } | |
a0ade1de | 1940 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1941 | |
1c6bd717 TT |
1942 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1943 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1944 | |
e2b911c5 | 1945 | meta_bg = ext4_has_feature_meta_bg(sb); |
19c5246d | 1946 | |
e2b911c5 | 1947 | if (ext4_has_feature_resize_inode(sb)) { |
01f795f9 YY |
1948 | if (meta_bg) { |
1949 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1950 | "simultaneously"); | |
1951 | return -EINVAL; | |
1952 | } | |
1c6bd717 TT |
1953 | if (n_desc_blocks > o_desc_blocks + |
1954 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1955 | n_blocks_count_retry = n_blocks_count; | |
1956 | n_desc_blocks = o_desc_blocks + | |
1957 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
1958 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
aec51758 JL |
1959 | n_blocks_count = (ext4_fsblk_t)n_group * |
1960 | EXT4_BLOCKS_PER_GROUP(sb); | |
1c6bd717 | 1961 | n_group--; /* set to last group number */ |
01f795f9 | 1962 | } |
1c6bd717 TT |
1963 | |
1964 | if (!resize_inode) | |
1965 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
01f795f9 YY |
1966 | if (IS_ERR(resize_inode)) { |
1967 | ext4_warning(sb, "Error opening resize inode"); | |
1968 | return PTR_ERR(resize_inode); | |
1969 | } | |
1c6bd717 TT |
1970 | } |
1971 | ||
59e31c15 | 1972 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
1973 | err = ext4_convert_meta_bg(sb, resize_inode); |
1974 | if (err) | |
1975 | goto out; | |
1976 | if (resize_inode) { | |
1977 | iput(resize_inode); | |
1978 | resize_inode = NULL; | |
1979 | } | |
1980 | if (n_blocks_count_retry) { | |
1981 | n_blocks_count = n_blocks_count_retry; | |
1982 | n_blocks_count_retry = 0; | |
1983 | goto retry; | |
1984 | } | |
19c5246d YY |
1985 | } |
1986 | ||
a0ade1de LC |
1987 | /* extend the last group */ |
1988 | if (n_group == o_group) | |
1989 | add = n_blocks_count - o_blocks_count; | |
1990 | else | |
d77147ff | 1991 | add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); |
a0ade1de | 1992 | if (add > 0) { |
19c5246d YY |
1993 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1994 | if (err) | |
1995 | goto out; | |
1996 | } | |
1997 | ||
d7574ad0 | 1998 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
1999 | goto out; |
2000 | ||
117fff10 TT |
2001 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
2002 | if (err) | |
2003 | return err; | |
2004 | ||
28623c2f TT |
2005 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
2006 | if (err) | |
2007 | goto out; | |
2008 | ||
19c5246d YY |
2009 | flex_gd = alloc_flex_gd(flexbg_size); |
2010 | if (flex_gd == NULL) { | |
2011 | err = -ENOMEM; | |
2012 | goto out; | |
2013 | } | |
2014 | ||
2015 | /* Add flex groups. Note that a regular group is a | |
2016 | * flex group with 1 group. | |
2017 | */ | |
2018 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
2019 | flexbg_size)) { | |
4da4a56e TT |
2020 | if (jiffies - last_update_time > HZ * 10) { |
2021 | if (last_update_time) | |
2022 | ext4_msg(sb, KERN_INFO, | |
2023 | "resized to %llu blocks", | |
2024 | ext4_blocks_count(es)); | |
2025 | last_update_time = jiffies; | |
2026 | } | |
03c1c290 YY |
2027 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
2028 | break; | |
19c5246d YY |
2029 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
2030 | if (unlikely(err)) | |
2031 | break; | |
2032 | } | |
2033 | ||
1c6bd717 TT |
2034 | if (!err && n_blocks_count_retry) { |
2035 | n_blocks_count = n_blocks_count_retry; | |
2036 | n_blocks_count_retry = 0; | |
2037 | free_flex_gd(flex_gd); | |
2038 | flex_gd = NULL; | |
2039 | goto retry; | |
2040 | } | |
2041 | ||
19c5246d YY |
2042 | out: |
2043 | if (flex_gd) | |
2044 | free_flex_gd(flex_gd); | |
01f795f9 YY |
2045 | if (resize_inode != NULL) |
2046 | iput(resize_inode); | |
59e31c15 | 2047 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count); |
19c5246d YY |
2048 | return err; |
2049 | } |