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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ac27a0ec | 2 | /* |
617ba13b | 3 | * linux/fs/ext4/resize.c |
ac27a0ec | 4 | * |
617ba13b | 5 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
6 | * |
7 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
8 | * | |
9 | * This could probably be made into a module, because it is not often in use. | |
10 | */ | |
11 | ||
12 | ||
617ba13b | 13 | #define EXT4FS_DEBUG |
ac27a0ec | 14 | |
ac27a0ec DK |
15 | #include <linux/errno.h> |
16 | #include <linux/slab.h> | |
17 | ||
3dcf5451 | 18 | #include "ext4_jbd2.h" |
ac27a0ec | 19 | |
8f82f840 YY |
20 | int ext4_resize_begin(struct super_block *sb) |
21 | { | |
ac495f0c | 22 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
8f82f840 YY |
23 | int ret = 0; |
24 | ||
78a8da10 | 25 | if (!ns_capable(sb->s_user_ns, CAP_SYS_RESOURCE)) |
8f82f840 YY |
26 | return -EPERM; |
27 | ||
011fa994 TT |
28 | /* |
29 | * If we are not using the primary superblock/GDT copy don't resize, | |
30 | * because the user tools have no way of handling this. Probably a | |
31 | * bad time to do it anyways. | |
32 | */ | |
ac495f0c | 33 | if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) != |
011fa994 TT |
34 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { |
35 | ext4_warning(sb, "won't resize using backup superblock at %llu", | |
36 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); | |
37 | return -EPERM; | |
38 | } | |
39 | ||
ce723c31 YY |
40 | /* |
41 | * We are not allowed to do online-resizing on a filesystem mounted | |
42 | * with error, because it can destroy the filesystem easily. | |
43 | */ | |
44 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
45 | ext4_warning(sb, "There are errors in the filesystem, " | |
8d2ae1cb | 46 | "so online resizing is not allowed"); |
ce723c31 YY |
47 | return -EPERM; |
48 | } | |
49 | ||
9549a168 TT |
50 | if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, |
51 | &EXT4_SB(sb)->s_ext4_flags)) | |
8f82f840 YY |
52 | ret = -EBUSY; |
53 | ||
54 | return ret; | |
55 | } | |
56 | ||
57 | void ext4_resize_end(struct super_block *sb) | |
58 | { | |
9549a168 | 59 | clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags); |
4e857c58 | 60 | smp_mb__after_atomic(); |
8f82f840 YY |
61 | } |
62 | ||
01f795f9 YY |
63 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
64 | ext4_group_t group) { | |
65 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
66 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
67 | } | |
68 | ||
69 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
70 | ext4_group_t group) { | |
71 | group = ext4_meta_bg_first_group(sb, group); | |
72 | return ext4_group_first_block_no(sb, group); | |
73 | } | |
74 | ||
75 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
76 | ext4_group_t group) { | |
77 | ext4_grpblk_t overhead; | |
78 | overhead = ext4_bg_num_gdb(sb, group); | |
79 | if (ext4_bg_has_super(sb, group)) | |
80 | overhead += 1 + | |
81 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
82 | return overhead; | |
83 | } | |
84 | ||
ac27a0ec DK |
85 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
86 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
87 | ||
88 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 89 | struct ext4_new_group_data *input) |
ac27a0ec | 90 | { |
617ba13b MC |
91 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
92 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 93 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 94 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 95 | ext4_group_t group = input->group; |
617ba13b | 96 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
b302ef2d TT |
97 | unsigned overhead; |
98 | ext4_fsblk_t metaend; | |
ac27a0ec | 99 | struct buffer_head *bh = NULL; |
3a5b2ecd | 100 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
101 | int err = -EINVAL; |
102 | ||
b302ef2d TT |
103 | if (group != sbi->s_groups_count) { |
104 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", | |
105 | input->group, sbi->s_groups_count); | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | overhead = ext4_group_overhead_blocks(sb, group); | |
110 | metaend = start + overhead; | |
d77147ff | 111 | input->free_clusters_count = free_blocks_count = |
ac27a0ec DK |
112 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; |
113 | ||
114 | if (test_opt(sb, DEBUG)) | |
617ba13b | 115 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 116 | "(%d free, %u reserved)\n", |
617ba13b | 117 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
118 | "no-super", input->group, input->blocks_count, |
119 | free_blocks_count, input->reserved_blocks); | |
120 | ||
3a5b2ecd | 121 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
b302ef2d | 122 | if (offset != 0) |
12062ddd | 123 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 124 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 125 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
126 | input->reserved_blocks); |
127 | else if (free_blocks_count < 0) | |
12062ddd | 128 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec | 129 | input->blocks_count); |
cf143064 TT |
130 | else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) { |
131 | err = PTR_ERR(bh); | |
132 | bh = NULL; | |
12062ddd | 133 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec | 134 | end - 1); |
cf143064 | 135 | } else if (outside(input->block_bitmap, start, end)) |
12062ddd | 136 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 137 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 138 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 139 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 140 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 141 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 142 | outside(itend - 1, start, end)) |
12062ddd | 143 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 144 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 145 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 146 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 147 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 148 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
149 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
150 | "(%llu-%llu)", | |
1939e49a RD |
151 | (unsigned long long)input->block_bitmap, |
152 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 153 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
154 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
155 | "(%llu-%llu)", | |
1939e49a RD |
156 | (unsigned long long)input->inode_bitmap, |
157 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 158 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 159 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
160 | (unsigned long long)input->block_bitmap, |
161 | start, metaend - 1); | |
ac27a0ec | 162 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 163 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
164 | (unsigned long long)input->inode_bitmap, |
165 | start, metaend - 1); | |
ac27a0ec | 166 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 167 | inside(itend - 1, start, metaend)) |
12062ddd ES |
168 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
169 | "(%llu-%llu)", | |
1939e49a RD |
170 | (unsigned long long)input->inode_table, |
171 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
172 | else |
173 | err = 0; | |
174 | brelse(bh); | |
175 | ||
176 | return err; | |
177 | } | |
178 | ||
28c7bac0 YY |
179 | /* |
180 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
181 | * group each time. | |
182 | */ | |
183 | struct ext4_new_flex_group_data { | |
184 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
185 | in the flex group */ | |
186 | __u16 *bg_flags; /* block group flags of groups | |
187 | in @groups */ | |
188 | ext4_group_t count; /* number of groups in @groups | |
189 | */ | |
190 | }; | |
191 | ||
192 | /* | |
193 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
194 | * @flexbg_size. | |
195 | * | |
196 | * Returns NULL on failure otherwise address of the allocated structure. | |
197 | */ | |
198 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
199 | { | |
200 | struct ext4_new_flex_group_data *flex_gd; | |
201 | ||
202 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
203 | if (flex_gd == NULL) | |
204 | goto out3; | |
205 | ||
46901760 | 206 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data)) |
967ac8af | 207 | goto out2; |
28c7bac0 YY |
208 | flex_gd->count = flexbg_size; |
209 | ||
210 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
211 | flexbg_size, GFP_NOFS); | |
212 | if (flex_gd->groups == NULL) | |
213 | goto out2; | |
214 | ||
215 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
216 | if (flex_gd->bg_flags == NULL) | |
217 | goto out1; | |
218 | ||
219 | return flex_gd; | |
220 | ||
221 | out1: | |
222 | kfree(flex_gd->groups); | |
223 | out2: | |
224 | kfree(flex_gd); | |
225 | out3: | |
226 | return NULL; | |
227 | } | |
228 | ||
229 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
230 | { | |
231 | kfree(flex_gd->bg_flags); | |
232 | kfree(flex_gd->groups); | |
233 | kfree(flex_gd); | |
234 | } | |
235 | ||
3fbea4b3 YY |
236 | /* |
237 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
238 | * and inode tables for a flex group. | |
239 | * | |
240 | * This function is used by 64bit-resize. Note that this function allocates | |
241 | * group tables from the 1st group of groups contained by @flexgd, which may | |
242 | * be a partial of a flex group. | |
243 | * | |
244 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
245 | * |
246 | * Returns 0 on a successful allocation of the metadata blocks in the | |
247 | * block group. | |
3fbea4b3 | 248 | */ |
03c1c290 | 249 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
250 | struct ext4_new_flex_group_data *flex_gd, |
251 | int flexbg_size) | |
252 | { | |
253 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
254 | ext4_fsblk_t start_blk; |
255 | ext4_fsblk_t last_blk; | |
256 | ext4_group_t src_group; | |
257 | ext4_group_t bb_index = 0; | |
258 | ext4_group_t ib_index = 0; | |
259 | ext4_group_t it_index = 0; | |
260 | ext4_group_t group; | |
261 | ext4_group_t last_group; | |
262 | unsigned overhead; | |
b93c9535 | 263 | __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0; |
d77147ff | 264 | int i; |
3fbea4b3 YY |
265 | |
266 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
267 | ||
268 | src_group = group_data[0].group; | |
269 | last_group = src_group + flex_gd->count - 1; | |
270 | ||
271 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
272 | (last_group & ~(flexbg_size - 1)))); | |
273 | next_group: | |
274 | group = group_data[0].group; | |
03c1c290 YY |
275 | if (src_group >= group_data[0].group + flex_gd->count) |
276 | return -ENOSPC; | |
3fbea4b3 YY |
277 | start_blk = ext4_group_first_block_no(sb, src_group); |
278 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
279 | ||
01f795f9 | 280 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
281 | |
282 | start_blk += overhead; | |
283 | ||
3fbea4b3 YY |
284 | /* We collect contiguous blocks as much as possible. */ |
285 | src_group++; | |
01f795f9 YY |
286 | for (; src_group <= last_group; src_group++) { |
287 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
b93c9535 | 288 | if (overhead == 0) |
3fbea4b3 YY |
289 | last_blk += group_data[src_group - group].blocks_count; |
290 | else | |
291 | break; | |
01f795f9 | 292 | } |
3fbea4b3 YY |
293 | |
294 | /* Allocate block bitmaps */ | |
295 | for (; bb_index < flex_gd->count; bb_index++) { | |
296 | if (start_blk >= last_blk) | |
297 | goto next_group; | |
298 | group_data[bb_index].block_bitmap = start_blk++; | |
bd86298e | 299 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 300 | group -= group_data[0].group; |
d77147ff | 301 | group_data[group].mdata_blocks++; |
b93c9535 | 302 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
303 | } |
304 | ||
305 | /* Allocate inode bitmaps */ | |
306 | for (; ib_index < flex_gd->count; ib_index++) { | |
307 | if (start_blk >= last_blk) | |
308 | goto next_group; | |
309 | group_data[ib_index].inode_bitmap = start_blk++; | |
bd86298e | 310 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 | 311 | group -= group_data[0].group; |
d77147ff | 312 | group_data[group].mdata_blocks++; |
b93c9535 | 313 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
314 | } |
315 | ||
316 | /* Allocate inode tables */ | |
317 | for (; it_index < flex_gd->count; it_index++) { | |
b93c9535 TT |
318 | unsigned int itb = EXT4_SB(sb)->s_itb_per_group; |
319 | ext4_fsblk_t next_group_start; | |
320 | ||
321 | if (start_blk + itb > last_blk) | |
3fbea4b3 YY |
322 | goto next_group; |
323 | group_data[it_index].inode_table = start_blk; | |
b93c9535 TT |
324 | group = ext4_get_group_number(sb, start_blk); |
325 | next_group_start = ext4_group_first_block_no(sb, group + 1); | |
3fbea4b3 | 326 | group -= group_data[0].group; |
3fbea4b3 | 327 | |
b93c9535 TT |
328 | if (start_blk + itb > next_group_start) { |
329 | flex_gd->bg_flags[group + 1] &= uninit_mask; | |
330 | overhead = start_blk + itb - next_group_start; | |
d77147ff | 331 | group_data[group + 1].mdata_blocks += overhead; |
b93c9535 TT |
332 | itb -= overhead; |
333 | } | |
334 | ||
d77147ff | 335 | group_data[group].mdata_blocks += itb; |
b93c9535 | 336 | flex_gd->bg_flags[group] &= uninit_mask; |
3fbea4b3 YY |
337 | start_blk += EXT4_SB(sb)->s_itb_per_group; |
338 | } | |
339 | ||
d77147ff | 340 | /* Update free clusters count to exclude metadata blocks */ |
341 | for (i = 0; i < flex_gd->count; i++) { | |
342 | group_data[i].free_clusters_count -= | |
343 | EXT4_NUM_B2C(EXT4_SB(sb), | |
344 | group_data[i].mdata_blocks); | |
345 | } | |
346 | ||
3fbea4b3 YY |
347 | if (test_opt(sb, DEBUG)) { |
348 | int i; | |
349 | group = group_data[0].group; | |
350 | ||
351 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
352 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
353 | flexbg_size); | |
354 | ||
355 | for (i = 0; i < flex_gd->count; i++) { | |
d77147ff | 356 | ext4_debug( |
357 | "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n", | |
3fbea4b3 YY |
358 | ext4_bg_has_super(sb, group + i) ? "normal" : |
359 | "no-super", group + i, | |
360 | group_data[i].blocks_count, | |
d77147ff | 361 | group_data[i].free_clusters_count, |
362 | group_data[i].mdata_blocks); | |
3fbea4b3 YY |
363 | } |
364 | } | |
03c1c290 | 365 | return 0; |
3fbea4b3 YY |
366 | } |
367 | ||
ac27a0ec | 368 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 369 | ext4_fsblk_t blk) |
ac27a0ec DK |
370 | { |
371 | struct buffer_head *bh; | |
372 | int err; | |
373 | ||
374 | bh = sb_getblk(sb, blk); | |
aebf0243 | 375 | if (unlikely(!bh)) |
860d21e2 | 376 | return ERR_PTR(-ENOMEM); |
5d601255 | 377 | BUFFER_TRACE(bh, "get_write_access"); |
617ba13b | 378 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
379 | brelse(bh); |
380 | bh = ERR_PTR(err); | |
381 | } else { | |
ac27a0ec DK |
382 | memset(bh->b_data, 0, sb->s_blocksize); |
383 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
384 | } |
385 | ||
386 | return bh; | |
387 | } | |
388 | ||
14904107 ES |
389 | /* |
390 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
391 | * If that fails, restart the transaction & regain write access for the | |
392 | * buffer head which is used for block_bitmap modifications. | |
393 | */ | |
6d40bc5a | 394 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
395 | { |
396 | int err; | |
397 | ||
0390131b | 398 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
399 | return 0; |
400 | ||
401 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
402 | if (err < 0) | |
403 | return err; | |
404 | if (err) { | |
6d40bc5a YY |
405 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
406 | if (err) | |
14904107 | 407 | return err; |
2b2d6d01 | 408 | } |
14904107 ES |
409 | |
410 | return 0; | |
411 | } | |
412 | ||
33afdcc5 | 413 | /* |
d77147ff | 414 | * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used. |
33afdcc5 YY |
415 | * |
416 | * Helper function for ext4_setup_new_group_blocks() which set . | |
417 | * | |
418 | * @sb: super block | |
419 | * @handle: journal handle | |
420 | * @flex_gd: flex group data | |
421 | */ | |
422 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
423 | struct ext4_new_flex_group_data *flex_gd, | |
d77147ff | 424 | ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster) |
33afdcc5 | 425 | { |
d77147ff | 426 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
427 | ext4_group_t count = last_cluster - first_cluster + 1; | |
33afdcc5 YY |
428 | ext4_group_t count2; |
429 | ||
d77147ff | 430 | ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster, |
431 | last_cluster); | |
432 | for (count2 = count; count > 0; | |
433 | count -= count2, first_cluster += count2) { | |
33afdcc5 YY |
434 | ext4_fsblk_t start; |
435 | struct buffer_head *bh; | |
436 | ext4_group_t group; | |
437 | int err; | |
438 | ||
d77147ff | 439 | group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster)); |
440 | start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group)); | |
33afdcc5 YY |
441 | group -= flex_gd->groups[0].group; |
442 | ||
d77147ff | 443 | count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start); |
33afdcc5 YY |
444 | if (count2 > count) |
445 | count2 = count; | |
446 | ||
447 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
448 | BUG_ON(flex_gd->count > 1); | |
449 | continue; | |
450 | } | |
451 | ||
452 | err = extend_or_restart_transaction(handle, 1); | |
453 | if (err) | |
454 | return err; | |
455 | ||
456 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 457 | if (unlikely(!bh)) |
860d21e2 | 458 | return -ENOMEM; |
33afdcc5 | 459 | |
5d601255 | 460 | BUFFER_TRACE(bh, "get_write_access"); |
33afdcc5 | 461 | err = ext4_journal_get_write_access(handle, bh); |
35fede91 VA |
462 | if (err) { |
463 | brelse(bh); | |
464 | return err; | |
465 | } | |
d77147ff | 466 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", |
467 | first_cluster, first_cluster - start, count2); | |
468 | ext4_set_bits(bh->b_data, first_cluster - start, count2); | |
33afdcc5 YY |
469 | |
470 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
35fede91 | 471 | brelse(bh); |
33afdcc5 YY |
472 | if (unlikely(err)) |
473 | return err; | |
33afdcc5 YY |
474 | } |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
481 | * This doesn't need to be part of the main transaction, since we are only | |
482 | * changing blocks outside the actual filesystem. We still do journaling to | |
483 | * ensure the recovery is correct in case of a failure just after resize. | |
484 | * If any part of this fails, we simply abort the resize. | |
485 | * | |
486 | * setup_new_flex_group_blocks handles a flex group as follow: | |
487 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
488 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
489 | * super block and GDT. | |
490 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
491 | * bitmap for blocks taken by group tables. | |
492 | */ | |
493 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
494 | struct ext4_new_flex_group_data *flex_gd) | |
495 | { | |
496 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
497 | ext4_fsblk_t start; | |
498 | ext4_fsblk_t block; | |
499 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
500 | struct ext4_super_block *es = sbi->s_es; | |
501 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
502 | __u16 *bg_flags = flex_gd->bg_flags; | |
503 | handle_t *handle; | |
504 | ext4_group_t group, count; | |
505 | struct buffer_head *bh = NULL; | |
506 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 507 | int meta_bg; |
33afdcc5 YY |
508 | |
509 | BUG_ON(!flex_gd->count || !group_data || | |
510 | group_data[0].group != sbi->s_groups_count); | |
511 | ||
512 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
e2b911c5 | 513 | meta_bg = ext4_has_feature_meta_bg(sb); |
33afdcc5 YY |
514 | |
515 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 516 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
517 | if (IS_ERR(handle)) |
518 | return PTR_ERR(handle); | |
519 | ||
520 | group = group_data[0].group; | |
521 | for (i = 0; i < flex_gd->count; i++, group++) { | |
522 | unsigned long gdblocks; | |
01f795f9 | 523 | ext4_grpblk_t overhead; |
33afdcc5 YY |
524 | |
525 | gdblocks = ext4_bg_num_gdb(sb, group); | |
526 | start = ext4_group_first_block_no(sb, group); | |
527 | ||
01f795f9 | 528 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
529 | goto handle_itb; |
530 | ||
01f795f9 YY |
531 | if (meta_bg == 1) { |
532 | ext4_group_t first_group; | |
533 | first_group = ext4_meta_bg_first_group(sb, group); | |
534 | if (first_group != group + 1 && | |
535 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
536 | goto handle_itb; | |
537 | } | |
538 | ||
539 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 540 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 541 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
542 | struct buffer_head *gdb; |
543 | ||
544 | ext4_debug("update backup group %#04llx\n", block); | |
545 | err = extend_or_restart_transaction(handle, 1); | |
546 | if (err) | |
547 | goto out; | |
548 | ||
549 | gdb = sb_getblk(sb, block); | |
aebf0243 | 550 | if (unlikely(!gdb)) { |
860d21e2 | 551 | err = -ENOMEM; |
33afdcc5 YY |
552 | goto out; |
553 | } | |
554 | ||
5d601255 | 555 | BUFFER_TRACE(gdb, "get_write_access"); |
33afdcc5 YY |
556 | err = ext4_journal_get_write_access(handle, gdb); |
557 | if (err) { | |
558 | brelse(gdb); | |
559 | goto out; | |
560 | } | |
561 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
562 | gdb->b_size); | |
563 | set_buffer_uptodate(gdb); | |
564 | ||
565 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
566 | if (unlikely(err)) { | |
567 | brelse(gdb); | |
568 | goto out; | |
569 | } | |
570 | brelse(gdb); | |
571 | } | |
572 | ||
573 | /* Zero out all of the reserved backup group descriptor | |
574 | * table blocks | |
575 | */ | |
576 | if (ext4_bg_has_super(sb, group)) { | |
577 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
578 | reserved_gdb, GFP_NOFS); | |
579 | if (err) | |
580 | goto out; | |
581 | } | |
582 | ||
6df935ad | 583 | handle_itb: |
33afdcc5 YY |
584 | /* Initialize group tables of the grop @group */ |
585 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
586 | goto handle_bb; | |
587 | ||
588 | /* Zero out all of the inode table blocks */ | |
589 | block = group_data[i].inode_table; | |
590 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
591 | block, sbi->s_itb_per_group); | |
592 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
593 | GFP_NOFS); | |
594 | if (err) | |
595 | goto out; | |
596 | ||
597 | handle_bb: | |
598 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
599 | goto handle_ib; | |
600 | ||
601 | /* Initialize block bitmap of the @group */ | |
602 | block = group_data[i].block_bitmap; | |
603 | err = extend_or_restart_transaction(handle, 1); | |
604 | if (err) | |
605 | goto out; | |
606 | ||
607 | bh = bclean(handle, sb, block); | |
608 | if (IS_ERR(bh)) { | |
609 | err = PTR_ERR(bh); | |
610 | goto out; | |
611 | } | |
01f795f9 YY |
612 | overhead = ext4_group_overhead_blocks(sb, group); |
613 | if (overhead != 0) { | |
33afdcc5 YY |
614 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
615 | start); | |
d77147ff | 616 | ext4_set_bits(bh->b_data, 0, |
617 | EXT4_NUM_B2C(sbi, overhead)); | |
33afdcc5 | 618 | } |
d77147ff | 619 | ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count), |
33afdcc5 YY |
620 | sb->s_blocksize * 8, bh->b_data); |
621 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
ea2ffe75 | 622 | brelse(bh); |
33afdcc5 YY |
623 | if (err) |
624 | goto out; | |
33afdcc5 YY |
625 | |
626 | handle_ib: | |
627 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
628 | continue; | |
629 | ||
630 | /* Initialize inode bitmap of the @group */ | |
631 | block = group_data[i].inode_bitmap; | |
632 | err = extend_or_restart_transaction(handle, 1); | |
633 | if (err) | |
634 | goto out; | |
635 | /* Mark unused entries in inode bitmap used */ | |
636 | bh = bclean(handle, sb, block); | |
637 | if (IS_ERR(bh)) { | |
638 | err = PTR_ERR(bh); | |
639 | goto out; | |
640 | } | |
641 | ||
642 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
643 | sb->s_blocksize * 8, bh->b_data); | |
644 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
ea2ffe75 | 645 | brelse(bh); |
33afdcc5 YY |
646 | if (err) |
647 | goto out; | |
33afdcc5 | 648 | } |
33afdcc5 YY |
649 | |
650 | /* Mark group tables in block bitmap */ | |
651 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
652 | count = group_table_count[j]; | |
653 | start = (&group_data[0].block_bitmap)[j]; | |
654 | block = start; | |
655 | for (i = 1; i < flex_gd->count; i++) { | |
656 | block += group_table_count[j]; | |
657 | if (block == (&group_data[i].block_bitmap)[j]) { | |
658 | count += group_table_count[j]; | |
659 | continue; | |
660 | } | |
661 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 662 | flex_gd, |
663 | EXT4_B2C(sbi, start), | |
664 | EXT4_B2C(sbi, | |
665 | start + count | |
666 | - 1)); | |
33afdcc5 YY |
667 | if (err) |
668 | goto out; | |
669 | count = group_table_count[j]; | |
b93c9535 | 670 | start = (&group_data[i].block_bitmap)[j]; |
33afdcc5 YY |
671 | block = start; |
672 | } | |
673 | ||
674 | if (count) { | |
675 | err = set_flexbg_block_bitmap(sb, handle, | |
d77147ff | 676 | flex_gd, |
677 | EXT4_B2C(sbi, start), | |
678 | EXT4_B2C(sbi, | |
679 | start + count | |
680 | - 1)); | |
33afdcc5 YY |
681 | if (err) |
682 | goto out; | |
683 | } | |
684 | } | |
685 | ||
686 | out: | |
33afdcc5 YY |
687 | err2 = ext4_journal_stop(handle); |
688 | if (err2 && !err) | |
689 | err = err2; | |
690 | ||
691 | return err; | |
692 | } | |
693 | ||
ac27a0ec DK |
694 | /* |
695 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 696 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
697 | * calling this for the first time. In a sparse filesystem it will be the |
698 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
699 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
700 | */ | |
617ba13b | 701 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
702 | unsigned *five, unsigned *seven) |
703 | { | |
704 | unsigned *min = three; | |
705 | int mult = 3; | |
706 | unsigned ret; | |
707 | ||
e2b911c5 | 708 | if (!ext4_has_feature_sparse_super(sb)) { |
ac27a0ec DK |
709 | ret = *min; |
710 | *min += 1; | |
711 | return ret; | |
712 | } | |
713 | ||
714 | if (*five < *min) { | |
715 | min = five; | |
716 | mult = 5; | |
717 | } | |
718 | if (*seven < *min) { | |
719 | min = seven; | |
720 | mult = 7; | |
721 | } | |
722 | ||
723 | ret = *min; | |
724 | *min *= mult; | |
725 | ||
726 | return ret; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
731 | * It is assumed that they are stored in group order. Returns the number of | |
732 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
733 | */ | |
734 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 735 | ext4_group_t end, |
ac27a0ec DK |
736 | struct buffer_head *primary) |
737 | { | |
617ba13b | 738 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
739 | unsigned three = 1; |
740 | unsigned five = 5; | |
741 | unsigned seven = 7; | |
742 | unsigned grp; | |
743 | __le32 *p = (__le32 *)primary->b_data; | |
744 | int gdbackups = 0; | |
745 | ||
617ba13b | 746 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
747 | if (le32_to_cpu(*p++) != |
748 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 749 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 750 | " missing grp %d (%llu)", |
ac27a0ec | 751 | blk, grp, |
bd81d8ee LV |
752 | grp * |
753 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
754 | blk); | |
ac27a0ec DK |
755 | return -EINVAL; |
756 | } | |
617ba13b | 757 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
758 | return -EFBIG; |
759 | } | |
760 | ||
761 | return gdbackups; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Called when we need to bring a reserved group descriptor table block into | |
766 | * use from the resize inode. The primary copy of the new GDT block currently | |
767 | * is an indirect block (under the double indirect block in the resize inode). | |
768 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
769 | * block, in group order. Even though we know all the block numbers we need, | |
770 | * we check to ensure that the resize inode has actually reserved these blocks. | |
771 | * | |
772 | * Don't need to update the block bitmaps because the blocks are still in use. | |
773 | * | |
774 | * We get all of the error cases out of the way, so that we are sure to not | |
775 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
776 | */ | |
777 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 778 | ext4_group_t group) |
ac27a0ec DK |
779 | { |
780 | struct super_block *sb = inode->i_sb; | |
617ba13b | 781 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 782 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 783 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
cf143064 TT |
784 | struct buffer_head **o_group_desc, **n_group_desc = NULL; |
785 | struct buffer_head *dind = NULL; | |
786 | struct buffer_head *gdb_bh = NULL; | |
ac27a0ec | 787 | int gdbackups; |
cf143064 | 788 | struct ext4_iloc iloc = { .bh = NULL }; |
ac27a0ec DK |
789 | __le32 *data; |
790 | int err; | |
791 | ||
792 | if (test_opt(sb, DEBUG)) | |
793 | printk(KERN_DEBUG | |
617ba13b | 794 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
795 | gdb_num); |
796 | ||
cf143064 TT |
797 | gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
798 | if (IS_ERR(gdb_bh)) | |
799 | return PTR_ERR(gdb_bh); | |
ac27a0ec | 800 | |
c72df9f9 | 801 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 802 | if (gdbackups < 0) { |
ac27a0ec | 803 | err = gdbackups; |
cf143064 | 804 | goto errout; |
ac27a0ec DK |
805 | } |
806 | ||
617ba13b | 807 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
cf143064 TT |
808 | dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
809 | if (IS_ERR(dind)) { | |
810 | err = PTR_ERR(dind); | |
811 | dind = NULL; | |
812 | goto errout; | |
ac27a0ec DK |
813 | } |
814 | ||
815 | data = (__le32 *)dind->b_data; | |
617ba13b | 816 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 817 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 818 | group, gdblock); |
ac27a0ec | 819 | err = -EINVAL; |
cf143064 | 820 | goto errout; |
ac27a0ec DK |
821 | } |
822 | ||
5d601255 | 823 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
b4097142 TT |
824 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
825 | if (unlikely(err)) | |
cf143064 | 826 | goto errout; |
ac27a0ec | 827 | |
5d601255 | 828 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
2f919710 | 829 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 830 | if (unlikely(err)) |
cf143064 | 831 | goto errout; |
ac27a0ec | 832 | |
5d601255 | 833 | BUFFER_TRACE(dind, "get_write_access"); |
b4097142 TT |
834 | err = ext4_journal_get_write_access(handle, dind); |
835 | if (unlikely(err)) | |
836 | ext4_std_error(sb, err); | |
ac27a0ec | 837 | |
617ba13b | 838 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
839 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
840 | if (unlikely(err)) | |
cf143064 | 841 | goto errout; |
ac27a0ec | 842 | |
f18a5f21 TT |
843 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
844 | sizeof(struct buffer_head *), | |
845 | GFP_NOFS); | |
ac27a0ec DK |
846 | if (!n_group_desc) { |
847 | err = -ENOMEM; | |
f18a5f21 TT |
848 | ext4_warning(sb, "not enough memory for %lu groups", |
849 | gdb_num + 1); | |
cf143064 | 850 | goto errout; |
ac27a0ec DK |
851 | } |
852 | ||
853 | /* | |
854 | * Finally, we have all of the possible failures behind us... | |
855 | * | |
856 | * Remove new GDT block from inode double-indirect block and clear out | |
857 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
858 | * from the reserved inode). We don't need to change the bitmaps for | |
859 | * these blocks, because they are marked as in-use from being in the | |
860 | * reserved inode, and will become GDT blocks (primary and backup). | |
861 | */ | |
617ba13b | 862 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
863 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
864 | if (unlikely(err)) { | |
865 | ext4_std_error(sb, err); | |
cf143064 | 866 | goto errout; |
b4097142 | 867 | } |
d77147ff | 868 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> |
869 | (9 - EXT4_SB(sb)->s_cluster_bits); | |
617ba13b | 870 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
871 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
872 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
873 | if (unlikely(err)) { |
874 | ext4_std_error(sb, err); | |
9abe1e3e | 875 | iloc.bh = NULL; |
cf143064 | 876 | goto errout; |
b4097142 TT |
877 | } |
878 | brelse(dind); | |
ac27a0ec | 879 | |
617ba13b | 880 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 881 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 882 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 883 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
884 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
885 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 886 | kvfree(o_group_desc); |
ac27a0ec | 887 | |
e8546d06 | 888 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 889 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
890 | if (err) |
891 | ext4_std_error(sb, err); | |
b4097142 | 892 | return err; |
cf143064 | 893 | errout: |
b93b41d4 | 894 | kvfree(n_group_desc); |
ac27a0ec | 895 | brelse(iloc.bh); |
ac27a0ec | 896 | brelse(dind); |
2f919710 | 897 | brelse(gdb_bh); |
ac27a0ec | 898 | |
617ba13b | 899 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
900 | return err; |
901 | } | |
902 | ||
01f795f9 YY |
903 | /* |
904 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
905 | */ | |
906 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
907 | handle_t *handle, ext4_group_t group) { | |
908 | ext4_fsblk_t gdblock; | |
909 | struct buffer_head *gdb_bh; | |
910 | struct buffer_head **o_group_desc, **n_group_desc; | |
911 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
912 | int err; | |
913 | ||
914 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
915 | ext4_bg_has_super(sb, group); | |
cf143064 TT |
916 | gdb_bh = ext4_sb_bread(sb, gdblock, 0); |
917 | if (IS_ERR(gdb_bh)) | |
918 | return PTR_ERR(gdb_bh); | |
01f795f9 YY |
919 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
920 | sizeof(struct buffer_head *), | |
921 | GFP_NOFS); | |
922 | if (!n_group_desc) { | |
8e69ddcf | 923 | brelse(gdb_bh); |
01f795f9 YY |
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; | |
ea8e7af1 LC |
934 | |
935 | BUFFER_TRACE(gdb_bh, "get_write_access"); | |
936 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
937 | if (err) { | |
938 | kvfree(n_group_desc); | |
939 | brelse(gdb_bh); | |
940 | return err; | |
941 | } | |
942 | ||
01f795f9 YY |
943 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
944 | EXT4_SB(sb)->s_gdb_count++; | |
b93b41d4 | 945 | kvfree(o_group_desc); |
01f795f9 YY |
946 | return err; |
947 | } | |
948 | ||
ac27a0ec DK |
949 | /* |
950 | * Called when we are adding a new group which has a backup copy of each of | |
951 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
952 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
953 | * that they are kept for future resizing and not allocated to files. | |
954 | * | |
955 | * Each reserved backup GDT block will go into a different indirect block. | |
956 | * The indirect blocks are actually the primary reserved GDT blocks, | |
957 | * so we know in advance what their block numbers are. We only get the | |
958 | * double-indirect block to verify it is pointing to the primary reserved | |
959 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
960 | * backup GDT blocks are stored in their reserved primary GDT block. | |
961 | */ | |
962 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 963 | ext4_group_t group) |
ac27a0ec DK |
964 | { |
965 | struct super_block *sb = inode->i_sb; | |
617ba13b | 966 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
d77147ff | 967 | int cluster_bits = EXT4_SB(sb)->s_cluster_bits; |
ac27a0ec DK |
968 | struct buffer_head **primary; |
969 | struct buffer_head *dind; | |
617ba13b MC |
970 | struct ext4_iloc iloc; |
971 | ext4_fsblk_t blk; | |
ac27a0ec DK |
972 | __le32 *data, *end; |
973 | int gdbackups = 0; | |
974 | int res, i; | |
975 | int err; | |
976 | ||
216553c4 | 977 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
978 | if (!primary) |
979 | return -ENOMEM; | |
980 | ||
617ba13b | 981 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
cf143064 TT |
982 | dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0); |
983 | if (IS_ERR(dind)) { | |
984 | err = PTR_ERR(dind); | |
985 | dind = NULL; | |
ac27a0ec DK |
986 | goto exit_free; |
987 | } | |
988 | ||
617ba13b | 989 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
990 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
991 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 992 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
993 | |
994 | /* Get each reserved primary GDT block and verify it holds backups */ | |
995 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
996 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 997 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
998 | " not at offset %ld", |
999 | blk, | |
1000 | (long)(data - (__le32 *)dind->b_data)); | |
1001 | err = -EINVAL; | |
1002 | goto exit_bh; | |
1003 | } | |
cf143064 TT |
1004 | primary[res] = ext4_sb_bread(sb, blk, 0); |
1005 | if (IS_ERR(primary[res])) { | |
1006 | err = PTR_ERR(primary[res]); | |
1007 | primary[res] = NULL; | |
ac27a0ec DK |
1008 | goto exit_bh; |
1009 | } | |
c72df9f9 YY |
1010 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
1011 | if (gdbackups < 0) { | |
ac27a0ec DK |
1012 | brelse(primary[res]); |
1013 | err = gdbackups; | |
1014 | goto exit_bh; | |
1015 | } | |
1016 | if (++data >= end) | |
1017 | data = (__le32 *)dind->b_data; | |
1018 | } | |
1019 | ||
1020 | for (i = 0; i < reserved_gdb; i++) { | |
5d601255 | 1021 | BUFFER_TRACE(primary[i], "get_write_access"); |
37be2f59 | 1022 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 1023 | goto exit_bh; |
ac27a0ec DK |
1024 | } |
1025 | ||
617ba13b | 1026 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
1027 | goto exit_bh; |
1028 | ||
1029 | /* | |
1030 | * Finally we can add each of the reserved backup GDT blocks from | |
1031 | * the new group to its reserved primary GDT block. | |
1032 | */ | |
668f4dc5 | 1033 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1034 | for (i = 0; i < reserved_gdb; i++) { |
1035 | int err2; | |
1036 | data = (__le32 *)primary[i]->b_data; | |
1037 | /* printk("reserving backup %lu[%u] = %lu\n", | |
1038 | primary[i]->b_blocknr, gdbackups, | |
1039 | blk + primary[i]->b_blocknr); */ | |
1040 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 1041 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
1042 | if (!err) |
1043 | err = err2; | |
1044 | } | |
d77147ff | 1045 | |
1046 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits); | |
617ba13b | 1047 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
1048 | |
1049 | exit_bh: | |
1050 | while (--res >= 0) | |
1051 | brelse(primary[res]); | |
1052 | brelse(dind); | |
1053 | ||
1054 | exit_free: | |
1055 | kfree(primary); | |
1056 | ||
1057 | return err; | |
1058 | } | |
1059 | ||
1060 | /* | |
617ba13b | 1061 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1062 | * of the main resize transaction, because e2fsck will re-write them if there |
1063 | * is a problem (basically only OOM will cause a problem). However, we | |
1064 | * _should_ update the backups if possible, in case the primary gets trashed | |
1065 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1066 | * important part is that the new block and inode counts are in the backup | |
1067 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1068 | * | |
32ed5058 TT |
1069 | * We do not need take the s_resize_lock for this, because these |
1070 | * blocks are not otherwise touched by the filesystem code when it is | |
1071 | * mounted. We don't need to worry about last changing from | |
1072 | * sbi->s_groups_count, because the worst that can happen is that we | |
1073 | * do not copy the full number of backups at this time. The resize | |
1074 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1075 | */ |
904dad47 | 1076 | static void update_backups(struct super_block *sb, sector_t blk_off, char *data, |
01f795f9 | 1077 | int size, int meta_bg) |
ac27a0ec | 1078 | { |
617ba13b | 1079 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1080 | ext4_group_t last; |
617ba13b | 1081 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1082 | unsigned three = 1; |
1083 | unsigned five = 5; | |
1084 | unsigned seven = 7; | |
01f795f9 | 1085 | ext4_group_t group = 0; |
ac27a0ec DK |
1086 | int rest = sb->s_blocksize - size; |
1087 | handle_t *handle; | |
1088 | int err = 0, err2; | |
1089 | ||
9924a92a | 1090 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1091 | if (IS_ERR(handle)) { |
1092 | group = 1; | |
1093 | err = PTR_ERR(handle); | |
1094 | goto exit_err; | |
1095 | } | |
1096 | ||
01f795f9 YY |
1097 | if (meta_bg == 0) { |
1098 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1099 | last = sbi->s_groups_count; | |
1100 | } else { | |
904dad47 | 1101 | group = ext4_get_group_number(sb, blk_off) + 1; |
01f795f9 YY |
1102 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); |
1103 | } | |
1104 | ||
1105 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1106 | struct buffer_head *bh; |
01f795f9 | 1107 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1108 | |
1109 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1110 | if (ext4_handle_valid(handle) && |
1111 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1112 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1113 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1114 | break; |
1115 | ||
01f795f9 | 1116 | if (meta_bg == 0) |
9378c676 | 1117 | backup_block = ((ext4_fsblk_t)group) * bpg + blk_off; |
01f795f9 YY |
1118 | else |
1119 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1120 | ext4_bg_has_super(sb, group)); | |
1121 | ||
1122 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1123 | if (unlikely(!bh)) { |
860d21e2 | 1124 | err = -ENOMEM; |
ac27a0ec DK |
1125 | break; |
1126 | } | |
01f795f9 YY |
1127 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1128 | backup_block, backup_block - | |
1129 | ext4_group_first_block_no(sb, group)); | |
5d601255 | 1130 | BUFFER_TRACE(bh, "get_write_access"); |
9341c1b0 VA |
1131 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
1132 | brelse(bh); | |
ac27a0ec | 1133 | break; |
9341c1b0 | 1134 | } |
ac27a0ec DK |
1135 | lock_buffer(bh); |
1136 | memcpy(bh->b_data, data, size); | |
1137 | if (rest) | |
1138 | memset(bh->b_data + size, 0, rest); | |
1139 | set_buffer_uptodate(bh); | |
1140 | unlock_buffer(bh); | |
b4097142 TT |
1141 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1142 | if (unlikely(err)) | |
1143 | ext4_std_error(sb, err); | |
ac27a0ec | 1144 | brelse(bh); |
01f795f9 YY |
1145 | |
1146 | if (meta_bg == 0) | |
1147 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1148 | else if (group == last) | |
1149 | break; | |
1150 | else | |
1151 | group = last; | |
ac27a0ec | 1152 | } |
617ba13b | 1153 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1154 | err = err2; |
1155 | ||
1156 | /* | |
1157 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1158 | * late to revert the resize, we shouldn't fail just because of | |
1159 | * the backup copies (they are only needed in case of corruption). | |
1160 | * | |
1161 | * However, if we got here we have a journal problem too, so we | |
1162 | * can't really start a transaction to mark the superblock. | |
1163 | * Chicken out and just set the flag on the hope it will be written | |
1164 | * to disk, and if not - we will simply wait until next fsck. | |
1165 | */ | |
1166 | exit_err: | |
1167 | if (err) { | |
12062ddd | 1168 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1169 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1170 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1171 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1172 | mark_buffer_dirty(sbi->s_sbh); |
1173 | } | |
1174 | } | |
1175 | ||
bb08c1e7 YY |
1176 | /* |
1177 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1178 | * starting at @group | |
1179 | * | |
1180 | * @handle: journal handle | |
1181 | * @sb: super block | |
1182 | * @group: the group no. of the first group desc to be added | |
1183 | * @resize_inode: the resize inode | |
1184 | * @count: number of group descriptors to be added | |
1185 | */ | |
1186 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1187 | ext4_group_t group, struct inode *resize_inode, | |
1188 | ext4_group_t count) | |
1189 | { | |
1190 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1191 | struct ext4_super_block *es = sbi->s_es; | |
1192 | struct buffer_head *gdb_bh; | |
1193 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1194 | int meta_bg; |
bb08c1e7 | 1195 | |
e2b911c5 | 1196 | meta_bg = ext4_has_feature_meta_bg(sb); |
bb08c1e7 YY |
1197 | for (i = 0; i < count; i++, group++) { |
1198 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1199 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1200 | ||
1201 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1202 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1203 | ||
1204 | /* | |
1205 | * We will only either add reserved group blocks to a backup group | |
1206 | * or remove reserved blocks for the first group in a new group block. | |
1207 | * Doing both would be mean more complex code, and sane people don't | |
1208 | * use non-sparse filesystems anymore. This is already checked above. | |
1209 | */ | |
1210 | if (gdb_off) { | |
1211 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
5d601255 | 1212 | BUFFER_TRACE(gdb_bh, "get_write_access"); |
bb08c1e7 YY |
1213 | err = ext4_journal_get_write_access(handle, gdb_bh); |
1214 | ||
1215 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1216 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1217 | } else if (meta_bg != 0) { |
1218 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1219 | } else { | |
bb08c1e7 | 1220 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1221 | } |
bb08c1e7 YY |
1222 | if (err) |
1223 | break; | |
1224 | } | |
1225 | return err; | |
1226 | } | |
1227 | ||
41a246d1 DW |
1228 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1229 | { | |
1230 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1231 | if (unlikely(!bh)) |
41a246d1 | 1232 | return NULL; |
7f1468d1 DM |
1233 | if (!bh_uptodate_or_lock(bh)) { |
1234 | if (bh_submit_read(bh) < 0) { | |
1235 | brelse(bh); | |
1236 | return NULL; | |
1237 | } | |
41a246d1 | 1238 | } |
41a246d1 DW |
1239 | |
1240 | return bh; | |
1241 | } | |
1242 | ||
1243 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1244 | ext4_group_t group, | |
1245 | struct ext4_group_desc *gdp, | |
1246 | struct ext4_new_group_data *group_data) | |
1247 | { | |
1248 | struct buffer_head *bh; | |
1249 | ||
9aa5d32b | 1250 | if (!ext4_has_metadata_csum(sb)) |
41a246d1 DW |
1251 | return 0; |
1252 | ||
1253 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1254 | if (!bh) | |
1255 | return -EIO; | |
1256 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1257 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1258 | brelse(bh); | |
1259 | ||
fa77dcfa DW |
1260 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1261 | if (!bh) | |
1262 | return -EIO; | |
79f1ba49 | 1263 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1264 | brelse(bh); |
1265 | ||
41a246d1 DW |
1266 | return 0; |
1267 | } | |
1268 | ||
083f5b24 YY |
1269 | /* |
1270 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1271 | */ | |
1272 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1273 | struct ext4_new_flex_group_data *flex_gd) | |
1274 | { | |
1275 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1276 | struct ext4_group_desc *gdp; | |
1277 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1278 | struct buffer_head *gdb_bh; | |
1279 | ext4_group_t group; | |
1280 | __u16 *bg_flags = flex_gd->bg_flags; | |
1281 | int i, gdb_off, gdb_num, err = 0; | |
d77147ff | 1282 | |
083f5b24 YY |
1283 | |
1284 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1285 | group = group_data->group; | |
1286 | ||
1287 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1288 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1289 | ||
1290 | /* | |
1291 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1292 | */ | |
1293 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1294 | /* Update group descriptor block for new group */ | |
2716b802 | 1295 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1296 | gdb_off * EXT4_DESC_SIZE(sb)); |
1297 | ||
1298 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1299 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1300 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1301 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1302 | if (err) { | |
1303 | ext4_std_error(sb, err); | |
1304 | break; | |
1305 | } | |
1306 | ||
083f5b24 YY |
1307 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1308 | ext4_free_group_clusters_set(sb, gdp, | |
d77147ff | 1309 | group_data->free_clusters_count); |
083f5b24 | 1310 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1311 | if (ext4_has_group_desc_csum(sb)) |
1312 | ext4_itable_unused_set(sb, gdp, | |
1313 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1314 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1315 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1316 | |
1317 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1318 | if (unlikely(err)) { | |
1319 | ext4_std_error(sb, err); | |
1320 | break; | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * We can allocate memory for mb_alloc based on the new group | |
1325 | * descriptor | |
1326 | */ | |
1327 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1328 | if (err) | |
1329 | break; | |
1330 | } | |
1331 | return err; | |
1332 | } | |
1333 | ||
2e10e2f2 YY |
1334 | /* |
1335 | * ext4_update_super() updates the super block so that the newly added | |
1336 | * groups can be seen by the filesystem. | |
1337 | * | |
1338 | * @sb: super block | |
1339 | * @flex_gd: new added groups | |
1340 | */ | |
1341 | static void ext4_update_super(struct super_block *sb, | |
1342 | struct ext4_new_flex_group_data *flex_gd) | |
1343 | { | |
1344 | ext4_fsblk_t blocks_count = 0; | |
1345 | ext4_fsblk_t free_blocks = 0; | |
1346 | ext4_fsblk_t reserved_blocks = 0; | |
1347 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1348 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1349 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1350 | int i; |
2e10e2f2 YY |
1351 | |
1352 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1353 | /* | |
1354 | * Make the new blocks and inodes valid next. We do this before | |
1355 | * increasing the group count so that once the group is enabled, | |
1356 | * all of its blocks and inodes are already valid. | |
1357 | * | |
1358 | * We always allocate group-by-group, then block-by-block or | |
1359 | * inode-by-inode within a group, so enabling these | |
1360 | * blocks/inodes before the group is live won't actually let us | |
1361 | * allocate the new space yet. | |
1362 | */ | |
1363 | for (i = 0; i < flex_gd->count; i++) { | |
1364 | blocks_count += group_data[i].blocks_count; | |
d77147ff | 1365 | free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count); |
2e10e2f2 YY |
1366 | } |
1367 | ||
1368 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1369 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1370 | reserved_blocks *= blocks_count; |
1371 | do_div(reserved_blocks, 100); | |
1372 | ||
1373 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1374 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1375 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1376 | flex_gd->count); | |
636d7e2e DW |
1377 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1378 | flex_gd->count); | |
2e10e2f2 | 1379 | |
01f795f9 | 1380 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1381 | /* |
1382 | * We need to protect s_groups_count against other CPUs seeing | |
1383 | * inconsistent state in the superblock. | |
1384 | * | |
1385 | * The precise rules we use are: | |
1386 | * | |
1387 | * * Writers must perform a smp_wmb() after updating all | |
1388 | * dependent data and before modifying the groups count | |
1389 | * | |
1390 | * * Readers must perform an smp_rmb() after reading the groups | |
1391 | * count and before reading any dependent data. | |
1392 | * | |
1393 | * NB. These rules can be relaxed when checking the group count | |
1394 | * while freeing data, as we can only allocate from a block | |
1395 | * group after serialising against the group count, and we can | |
1396 | * only then free after serialising in turn against that | |
1397 | * allocation. | |
1398 | */ | |
1399 | smp_wmb(); | |
1400 | ||
1401 | /* Update the global fs size fields */ | |
1402 | sbi->s_groups_count += flex_gd->count; | |
c5c72d81 TT |
1403 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
1404 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
2e10e2f2 YY |
1405 | |
1406 | /* Update the reserved block counts only once the new group is | |
1407 | * active. */ | |
1408 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1409 | reserved_blocks); | |
1410 | ||
1411 | /* Update the free space counts */ | |
1412 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1413 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1414 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1415 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1416 | ||
01f795f9 YY |
1417 | ext4_debug("free blocks count %llu", |
1418 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
e2b911c5 | 1419 | if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) { |
2e10e2f2 YY |
1420 | ext4_group_t flex_group; |
1421 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
90ba983f TT |
1422 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
1423 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2e10e2f2 YY |
1424 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
1425 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1426 | } | |
1427 | ||
952fc18e TT |
1428 | /* |
1429 | * Update the fs overhead information | |
1430 | */ | |
1431 | ext4_calculate_overhead(sb); | |
1432 | ||
2e10e2f2 YY |
1433 | if (test_opt(sb, DEBUG)) |
1434 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1435 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1436 | blocks_count, free_blocks, reserved_blocks); | |
1437 | } | |
1438 | ||
4bac1f8c YY |
1439 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1440 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1441 | * transaction and not have it write the data to disk. | |
1442 | */ | |
1443 | static int ext4_flex_group_add(struct super_block *sb, | |
1444 | struct inode *resize_inode, | |
1445 | struct ext4_new_flex_group_data *flex_gd) | |
1446 | { | |
1447 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1448 | struct ext4_super_block *es = sbi->s_es; | |
1449 | ext4_fsblk_t o_blocks_count; | |
1450 | ext4_grpblk_t last; | |
1451 | ext4_group_t group; | |
1452 | handle_t *handle; | |
1453 | unsigned reserved_gdb; | |
1454 | int err = 0, err2 = 0, credit; | |
1455 | ||
1456 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1457 | ||
1458 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1459 | o_blocks_count = ext4_blocks_count(es); | |
1460 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1461 | BUG_ON(last); | |
1462 | ||
1463 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1464 | if (err) | |
1465 | goto exit; | |
1466 | /* | |
1467 | * We will always be modifying at least the superblock and GDT | |
2c869b26 | 1468 | * blocks. If we are adding a group past the last current GDT block, |
4bac1f8c YY |
1469 | * we will also modify the inode and the dindirect block. If we |
1470 | * are adding a group with superblock/GDT backups we will also | |
1471 | * modify each of the reserved GDT dindirect blocks. | |
1472 | */ | |
2c869b26 JK |
1473 | credit = 3; /* sb, resize inode, resize inode dindirect */ |
1474 | /* GDT blocks */ | |
1475 | credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb)); | |
1476 | credit += reserved_gdb; /* Reserved GDT dindirect blocks */ | |
9924a92a | 1477 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1478 | if (IS_ERR(handle)) { |
1479 | err = PTR_ERR(handle); | |
1480 | goto exit; | |
1481 | } | |
1482 | ||
5d601255 | 1483 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
4bac1f8c YY |
1484 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1485 | if (err) | |
1486 | goto exit_journal; | |
1487 | ||
1488 | group = flex_gd->groups[0].group; | |
1489 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); | |
1490 | err = ext4_add_new_descs(handle, sb, group, | |
1491 | resize_inode, flex_gd->count); | |
1492 | if (err) | |
1493 | goto exit_journal; | |
1494 | ||
1495 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1496 | if (err) | |
1497 | goto exit_journal; | |
1498 | ||
1499 | ext4_update_super(sb, flex_gd); | |
1500 | ||
1501 | err = ext4_handle_dirty_super(handle, sb); | |
1502 | ||
1503 | exit_journal: | |
1504 | err2 = ext4_journal_stop(handle); | |
1505 | if (!err) | |
1506 | err = err2; | |
1507 | ||
1508 | if (!err) { | |
2ebd1704 YY |
1509 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1510 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1511 | EXT4_DESC_PER_BLOCK(sb)); | |
e2b911c5 | 1512 | int meta_bg = ext4_has_feature_meta_bg(sb); |
0acdb887 | 1513 | sector_t old_gdb = 0; |
2ebd1704 | 1514 | |
4bac1f8c | 1515 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1516 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1517 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1518 | struct buffer_head *gdb_bh; |
2ebd1704 | 1519 | |
4bac1f8c | 1520 | gdb_bh = sbi->s_group_desc[gdb_num]; |
0acdb887 TM |
1521 | if (old_gdb == gdb_bh->b_blocknr) |
1522 | continue; | |
4bac1f8c | 1523 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1524 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1525 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1526 | } |
1527 | } | |
1528 | exit: | |
1529 | return err; | |
1530 | } | |
1531 | ||
19c5246d YY |
1532 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1533 | struct ext4_new_flex_group_data *flex_gd, | |
1534 | ext4_fsblk_t n_blocks_count, | |
1535 | unsigned long flexbg_size) | |
1536 | { | |
d77147ff | 1537 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1538 | struct ext4_super_block *es = sbi->s_es; | |
19c5246d YY |
1539 | struct ext4_new_group_data *group_data = flex_gd->groups; |
1540 | ext4_fsblk_t o_blocks_count; | |
1541 | ext4_group_t n_group; | |
1542 | ext4_group_t group; | |
1543 | ext4_group_t last_group; | |
1544 | ext4_grpblk_t last; | |
d77147ff | 1545 | ext4_grpblk_t clusters_per_group; |
19c5246d YY |
1546 | unsigned long i; |
1547 | ||
d77147ff | 1548 | clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb); |
19c5246d YY |
1549 | |
1550 | o_blocks_count = ext4_blocks_count(es); | |
1551 | ||
1552 | if (o_blocks_count == n_blocks_count) | |
1553 | return 0; | |
1554 | ||
1555 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1556 | BUG_ON(last); | |
1557 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1558 | ||
1559 | last_group = group | (flexbg_size - 1); | |
1560 | if (last_group > n_group) | |
1561 | last_group = n_group; | |
1562 | ||
1563 | flex_gd->count = last_group - group + 1; | |
1564 | ||
1565 | for (i = 0; i < flex_gd->count; i++) { | |
1566 | int overhead; | |
1567 | ||
1568 | group_data[i].group = group + i; | |
d77147ff | 1569 | group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb); |
01f795f9 | 1570 | overhead = ext4_group_overhead_blocks(sb, group + i); |
d77147ff | 1571 | group_data[i].mdata_blocks = overhead; |
1572 | group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb); | |
7f511862 | 1573 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1574 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1575 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1576 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1577 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1578 | } else | |
19c5246d YY |
1579 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1580 | } | |
1581 | ||
feb0ab32 | 1582 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1583 | /* We need to initialize block bitmap of last group. */ |
1584 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1585 | ||
d77147ff | 1586 | if ((last_group == n_group) && (last != clusters_per_group - 1)) { |
1587 | group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1); | |
1588 | group_data[i - 1].free_clusters_count -= clusters_per_group - | |
1589 | last - 1; | |
19c5246d YY |
1590 | } |
1591 | ||
1592 | return 1; | |
1593 | } | |
1594 | ||
ac27a0ec DK |
1595 | /* Add group descriptor data to an existing or new group descriptor block. |
1596 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1597 | * the filesystem, because we cannot abort the transaction and not have it | |
1598 | * write the data to disk. | |
1599 | * | |
1600 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1601 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1602 | * | |
1603 | * We only need to hold the superblock lock while we are actually adding | |
1604 | * in the new group's counts to the superblock. Prior to that we have | |
1605 | * not really "added" the group at all. We re-check that we are still | |
1606 | * adding in the last group in case things have changed since verifying. | |
1607 | */ | |
617ba13b | 1608 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1609 | { |
61f296cc | 1610 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1611 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1612 | struct ext4_super_block *es = sbi->s_es; | |
1613 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1614 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1615 | struct inode *inode = NULL; |
03b40e34 | 1616 | int gdb_off; |
61f296cc YY |
1617 | int err; |
1618 | __u16 bg_flags = 0; | |
ac27a0ec | 1619 | |
617ba13b | 1620 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
ac27a0ec | 1621 | |
e2b911c5 | 1622 | if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) { |
12062ddd | 1623 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1624 | return -EPERM; |
1625 | } | |
1626 | ||
bd81d8ee LV |
1627 | if (ext4_blocks_count(es) + input->blocks_count < |
1628 | ext4_blocks_count(es)) { | |
12062ddd | 1629 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1630 | return -EINVAL; |
1631 | } | |
1632 | ||
617ba13b | 1633 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1634 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1635 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1636 | return -EINVAL; |
1637 | } | |
1638 | ||
1639 | if (reserved_gdb || gdb_off == 0) { | |
9a060855 | 1640 | if (!ext4_has_feature_resize_inode(sb) || |
e2b911c5 | 1641 | !le16_to_cpu(es->s_reserved_gdt_blocks)) { |
12062ddd | 1642 | ext4_warning(sb, |
ac27a0ec DK |
1643 | "No reserved GDT blocks, can't resize"); |
1644 | return -EPERM; | |
1645 | } | |
23b9aab1 | 1646 | inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL); |
1d1fe1ee | 1647 | if (IS_ERR(inode)) { |
12062ddd | 1648 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1649 | return PTR_ERR(inode); |
ac27a0ec DK |
1650 | } |
1651 | } | |
1652 | ||
920313a7 | 1653 | |
61f296cc | 1654 | err = verify_group_input(sb, input); |
08c3a813 | 1655 | if (err) |
61f296cc | 1656 | goto out; |
ac27a0ec | 1657 | |
117fff10 TT |
1658 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1659 | if (err) | |
7f511862 | 1660 | goto out; |
117fff10 | 1661 | |
28623c2f TT |
1662 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1663 | if (err) | |
1664 | goto out; | |
1665 | ||
61f296cc YY |
1666 | flex_gd.count = 1; |
1667 | flex_gd.groups = input; | |
1668 | flex_gd.bg_flags = &bg_flags; | |
1669 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1670 | out: | |
ac27a0ec DK |
1671 | iput(inode); |
1672 | return err; | |
617ba13b | 1673 | } /* ext4_group_add */ |
ac27a0ec | 1674 | |
18e31438 YY |
1675 | /* |
1676 | * extend a group without checking assuming that checking has been done. | |
1677 | */ | |
1678 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1679 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1680 | { | |
1681 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1682 | handle_t *handle; | |
1683 | int err = 0, err2; | |
1684 | ||
1685 | /* We will update the superblock, one block bitmap, and | |
1686 | * one group descriptor via ext4_group_add_blocks(). | |
1687 | */ | |
9924a92a | 1688 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1689 | if (IS_ERR(handle)) { |
1690 | err = PTR_ERR(handle); | |
1691 | ext4_warning(sb, "error %d on journal start", err); | |
1692 | return err; | |
1693 | } | |
1694 | ||
5d601255 | 1695 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
18e31438 YY |
1696 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
1697 | if (err) { | |
1698 | ext4_warning(sb, "error %d on journal write access", err); | |
1699 | goto errout; | |
1700 | } | |
1701 | ||
1702 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1703 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1704 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1705 | o_blocks_count + add); | |
1706 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1707 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1708 | if (err) | |
1709 | goto errout; | |
1710 | ext4_handle_dirty_super(handle, sb); | |
1711 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1712 | o_blocks_count + add); | |
1713 | errout: | |
1714 | err2 = ext4_journal_stop(handle); | |
1715 | if (err2 && !err) | |
1716 | err = err2; | |
1717 | ||
1718 | if (!err) { | |
1719 | if (test_opt(sb, DEBUG)) | |
1720 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1721 | "blocks\n", ext4_blocks_count(es)); | |
6ca792ed | 1722 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
01f795f9 | 1723 | (char *)es, sizeof(struct ext4_super_block), 0); |
18e31438 YY |
1724 | } |
1725 | return err; | |
1726 | } | |
1727 | ||
2b2d6d01 TT |
1728 | /* |
1729 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1730 | * point is only used to extend the current filesystem to the end of the last |
1731 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1732 | * for emergencies (because it has no dependencies on reserved blocks). | |
1733 | * | |
617ba13b | 1734 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1735 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1736 | * GDT blocks are reserved to grow to the desired size. | |
1737 | */ | |
617ba13b MC |
1738 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1739 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1740 | { |
617ba13b | 1741 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1742 | ext4_grpblk_t last; |
1743 | ext4_grpblk_t add; | |
af5bc92d | 1744 | struct buffer_head *bh; |
d89651c8 | 1745 | int err; |
5f21b0e6 | 1746 | ext4_group_t group; |
ac27a0ec | 1747 | |
bd81d8ee | 1748 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1749 | |
1750 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1751 | ext4_msg(sb, KERN_DEBUG, |
1752 | "extending last group from %llu to %llu blocks", | |
1753 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1754 | |
1755 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1756 | return 0; | |
1757 | ||
1758 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1759 | ext4_msg(sb, KERN_ERR, |
1760 | "filesystem too large to resize to %llu blocks safely", | |
1761 | n_blocks_count); | |
ac27a0ec | 1762 | if (sizeof(sector_t) < 8) |
12062ddd | 1763 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1764 | return -EINVAL; |
1765 | } | |
1766 | ||
1767 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1768 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1769 | return -EINVAL; |
ac27a0ec DK |
1770 | } |
1771 | ||
1772 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1773 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1774 | |
1775 | if (last == 0) { | |
12062ddd | 1776 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1777 | return -EPERM; |
1778 | } | |
1779 | ||
617ba13b | 1780 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1781 | |
1782 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1783 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1784 | return -EINVAL; |
1785 | } | |
1786 | ||
1787 | if (o_blocks_count + add > n_blocks_count) | |
1788 | add = n_blocks_count - o_blocks_count; | |
1789 | ||
1790 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1791 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1792 | o_blocks_count + add, add); |
1793 | ||
1794 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1795 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1796 | if (!bh) { |
12062ddd | 1797 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1798 | return -ENOSPC; |
1799 | } | |
1800 | brelse(bh); | |
1801 | ||
d89651c8 | 1802 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1803 | return err; |
617ba13b | 1804 | } /* ext4_group_extend */ |
19c5246d | 1805 | |
1c6bd717 TT |
1806 | |
1807 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1808 | { | |
1809 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Release the resize inode and drop the resize_inode feature if there | |
1814 | * are no more reserved gdt blocks, and then convert the file system | |
1815 | * to enable meta_bg | |
1816 | */ | |
1817 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1818 | { | |
1819 | handle_t *handle; | |
1820 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1821 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1822 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1823 | ext4_fsblk_t nr; |
1824 | int i, ret, err = 0; | |
1825 | int credits = 1; | |
1826 | ||
1827 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1828 | if (inode) { |
1c6bd717 TT |
1829 | if (es->s_reserved_gdt_blocks) { |
1830 | ext4_error(sb, "Unexpected non-zero " | |
1831 | "s_reserved_gdt_blocks"); | |
1832 | return -EPERM; | |
1833 | } | |
1c6bd717 TT |
1834 | |
1835 | /* Do a quick sanity check of the resize inode */ | |
d77147ff | 1836 | if (inode->i_blocks != 1 << (inode->i_blkbits - |
1837 | (9 - sbi->s_cluster_bits))) | |
1c6bd717 TT |
1838 | goto invalid_resize_inode; |
1839 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1840 | if (i == EXT4_DIND_BLOCK) { | |
1841 | if (ei->i_data[i]) | |
1842 | continue; | |
1843 | else | |
1844 | goto invalid_resize_inode; | |
1845 | } | |
1846 | if (ei->i_data[i]) | |
1847 | goto invalid_resize_inode; | |
1848 | } | |
1849 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1850 | } | |
1851 | ||
9924a92a | 1852 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1853 | if (IS_ERR(handle)) |
1854 | return PTR_ERR(handle); | |
1855 | ||
5d601255 | 1856 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
1c6bd717 TT |
1857 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
1858 | if (err) | |
1859 | goto errout; | |
1860 | ||
e2b911c5 DW |
1861 | ext4_clear_feature_resize_inode(sb); |
1862 | ext4_set_feature_meta_bg(sb); | |
1c6bd717 TT |
1863 | sbi->s_es->s_first_meta_bg = |
1864 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
1865 | ||
1866 | err = ext4_handle_dirty_super(handle, sb); | |
1867 | if (err) { | |
1868 | ext4_std_error(sb, err); | |
1869 | goto errout; | |
1870 | } | |
1871 | ||
1872 | if (inode) { | |
1873 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1874 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1875 | EXT4_FREE_BLOCKS_METADATA | | |
1876 | EXT4_FREE_BLOCKS_FORGET); | |
1877 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1878 | inode->i_blocks = 0; | |
1879 | ||
1880 | err = ext4_mark_inode_dirty(handle, inode); | |
1881 | if (err) | |
1882 | ext4_std_error(sb, err); | |
1883 | } | |
1884 | ||
1885 | errout: | |
1886 | ret = ext4_journal_stop(handle); | |
1887 | if (!err) | |
1888 | err = ret; | |
1889 | return ret; | |
1890 | ||
1891 | invalid_resize_inode: | |
1892 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | ||
19c5246d YY |
1896 | /* |
1897 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1898 | * | |
1899 | * @sb: super block of the fs to be resized | |
1900 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1901 | */ | |
1902 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1903 | { | |
1904 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1905 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1906 | struct ext4_super_block *es = sbi->s_es; | |
1907 | struct buffer_head *bh; | |
01f795f9 YY |
1908 | struct inode *resize_inode = NULL; |
1909 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1910 | unsigned long n_desc_blocks; |
1911 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1912 | ext4_group_t o_group; |
1913 | ext4_group_t n_group; | |
1914 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1915 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1916 | unsigned long last_update_time = 0; |
117fff10 | 1917 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1918 | int meta_bg; |
19c5246d | 1919 | |
59e31c15 TT |
1920 | /* See if the device is actually as big as what was requested */ |
1921 | bh = sb_bread(sb, n_blocks_count - 1); | |
1922 | if (!bh) { | |
1923 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1924 | return -ENOSPC; | |
1925 | } | |
1926 | brelse(bh); | |
1927 | ||
1c6bd717 | 1928 | retry: |
19c5246d YY |
1929 | o_blocks_count = ext4_blocks_count(es); |
1930 | ||
59e31c15 TT |
1931 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1932 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1933 | |
1934 | if (n_blocks_count < o_blocks_count) { | |
1935 | /* On-line shrinking not supported */ | |
1936 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1937 | return -EINVAL; | |
1938 | } | |
1939 | ||
1940 | if (n_blocks_count == o_blocks_count) | |
1941 | /* Nothing need to do */ | |
1942 | return 0; | |
1943 | ||
bd86298e | 1944 | n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
668dda3b | 1945 | if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
3f8a6411 TT |
1946 | ext4_warning(sb, "resize would cause inodes_count overflow"); |
1947 | return -EINVAL; | |
1948 | } | |
a0ade1de | 1949 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1950 | |
1c6bd717 TT |
1951 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1952 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1953 | |
e2b911c5 | 1954 | meta_bg = ext4_has_feature_meta_bg(sb); |
19c5246d | 1955 | |
e2b911c5 | 1956 | if (ext4_has_feature_resize_inode(sb)) { |
01f795f9 YY |
1957 | if (meta_bg) { |
1958 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1959 | "simultaneously"); | |
1960 | return -EINVAL; | |
1961 | } | |
1c6bd717 TT |
1962 | if (n_desc_blocks > o_desc_blocks + |
1963 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1964 | n_blocks_count_retry = n_blocks_count; | |
1965 | n_desc_blocks = o_desc_blocks + | |
1966 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
1967 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
aec51758 | 1968 | n_blocks_count = (ext4_fsblk_t)n_group * |
2d999d90 JK |
1969 | EXT4_BLOCKS_PER_GROUP(sb) + |
1970 | le32_to_cpu(es->s_first_data_block); | |
1c6bd717 | 1971 | n_group--; /* set to last group number */ |
01f795f9 | 1972 | } |
1c6bd717 TT |
1973 | |
1974 | if (!resize_inode) | |
23b9aab1 TT |
1975 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO, |
1976 | EXT4_IGET_SPECIAL); | |
01f795f9 YY |
1977 | if (IS_ERR(resize_inode)) { |
1978 | ext4_warning(sb, "Error opening resize inode"); | |
1979 | return PTR_ERR(resize_inode); | |
1980 | } | |
1c6bd717 TT |
1981 | } |
1982 | ||
59e31c15 | 1983 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
1984 | err = ext4_convert_meta_bg(sb, resize_inode); |
1985 | if (err) | |
1986 | goto out; | |
1987 | if (resize_inode) { | |
1988 | iput(resize_inode); | |
1989 | resize_inode = NULL; | |
1990 | } | |
1991 | if (n_blocks_count_retry) { | |
1992 | n_blocks_count = n_blocks_count_retry; | |
1993 | n_blocks_count_retry = 0; | |
1994 | goto retry; | |
1995 | } | |
19c5246d YY |
1996 | } |
1997 | ||
fb2d1e9c TT |
1998 | /* |
1999 | * Make sure the last group has enough space so that it's | |
2000 | * guaranteed to have enough space for all metadata blocks | |
2001 | * that it might need to hold. (We might not need to store | |
2002 | * the inode table blocks in the last block group, but there | |
2003 | * will be cases where this might be needed.) | |
2004 | */ | |
2005 | if ((ext4_group_first_block_no(sb, n_group) + | |
2006 | ext4_group_overhead_blocks(sb, n_group) + 2 + | |
2007 | sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) { | |
2008 | n_blocks_count = ext4_group_first_block_no(sb, n_group); | |
2009 | n_group--; | |
2010 | n_blocks_count_retry = 0; | |
2011 | if (resize_inode) { | |
2012 | iput(resize_inode); | |
2013 | resize_inode = NULL; | |
2014 | } | |
2015 | goto retry; | |
2016 | } | |
2017 | ||
a0ade1de LC |
2018 | /* extend the last group */ |
2019 | if (n_group == o_group) | |
2020 | add = n_blocks_count - o_blocks_count; | |
2021 | else | |
d77147ff | 2022 | add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1)); |
a0ade1de | 2023 | if (add > 0) { |
19c5246d YY |
2024 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
2025 | if (err) | |
2026 | goto out; | |
2027 | } | |
2028 | ||
d7574ad0 | 2029 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
2030 | goto out; |
2031 | ||
117fff10 TT |
2032 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
2033 | if (err) | |
11ab4805 | 2034 | goto out; |
117fff10 | 2035 | |
28623c2f TT |
2036 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
2037 | if (err) | |
2038 | goto out; | |
2039 | ||
19c5246d YY |
2040 | flex_gd = alloc_flex_gd(flexbg_size); |
2041 | if (flex_gd == NULL) { | |
2042 | err = -ENOMEM; | |
2043 | goto out; | |
2044 | } | |
2045 | ||
2046 | /* Add flex groups. Note that a regular group is a | |
2047 | * flex group with 1 group. | |
2048 | */ | |
2049 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
2050 | flexbg_size)) { | |
4da4a56e TT |
2051 | if (jiffies - last_update_time > HZ * 10) { |
2052 | if (last_update_time) | |
2053 | ext4_msg(sb, KERN_INFO, | |
2054 | "resized to %llu blocks", | |
2055 | ext4_blocks_count(es)); | |
2056 | last_update_time = jiffies; | |
2057 | } | |
03c1c290 YY |
2058 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
2059 | break; | |
19c5246d YY |
2060 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
2061 | if (unlikely(err)) | |
2062 | break; | |
2063 | } | |
2064 | ||
1c6bd717 TT |
2065 | if (!err && n_blocks_count_retry) { |
2066 | n_blocks_count = n_blocks_count_retry; | |
2067 | n_blocks_count_retry = 0; | |
2068 | free_flex_gd(flex_gd); | |
2069 | flex_gd = NULL; | |
56928b27 VA |
2070 | if (resize_inode) { |
2071 | iput(resize_inode); | |
2072 | resize_inode = NULL; | |
2073 | } | |
1c6bd717 TT |
2074 | goto retry; |
2075 | } | |
2076 | ||
19c5246d YY |
2077 | out: |
2078 | if (flex_gd) | |
2079 | free_flex_gd(flex_gd); | |
01f795f9 YY |
2080 | if (resize_inode != NULL) |
2081 | iput(resize_inode); | |
9ed728f2 LC |
2082 | if (err) |
2083 | ext4_warning(sb, "error (%d) occurred during " | |
2084 | "file system resize", err); | |
2085 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", | |
2086 | ext4_blocks_count(es)); | |
19c5246d YY |
2087 | return err; |
2088 | } |