Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/resize.c |
ac27a0ec | 3 | * |
617ba13b | 4 | * Support for resizing an ext4 filesystem while it is mounted. |
ac27a0ec DK |
5 | * |
6 | * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com> | |
7 | * | |
8 | * This could probably be made into a module, because it is not often in use. | |
9 | */ | |
10 | ||
11 | ||
617ba13b | 12 | #define EXT4FS_DEBUG |
ac27a0ec | 13 | |
ac27a0ec DK |
14 | #include <linux/errno.h> |
15 | #include <linux/slab.h> | |
16 | ||
3dcf5451 | 17 | #include "ext4_jbd2.h" |
ac27a0ec | 18 | |
8f82f840 YY |
19 | int ext4_resize_begin(struct super_block *sb) |
20 | { | |
21 | int ret = 0; | |
22 | ||
23 | if (!capable(CAP_SYS_RESOURCE)) | |
24 | return -EPERM; | |
25 | ||
ce723c31 YY |
26 | /* |
27 | * We are not allowed to do online-resizing on a filesystem mounted | |
28 | * with error, because it can destroy the filesystem easily. | |
29 | */ | |
30 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
31 | ext4_warning(sb, "There are errors in the filesystem, " | |
32 | "so online resizing is not allowed\n"); | |
33 | return -EPERM; | |
34 | } | |
35 | ||
8f82f840 YY |
36 | if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags)) |
37 | ret = -EBUSY; | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | void ext4_resize_end(struct super_block *sb) | |
43 | { | |
44 | clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags); | |
45 | smp_mb__after_clear_bit(); | |
46 | } | |
47 | ||
01f795f9 YY |
48 | static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb, |
49 | ext4_group_t group) { | |
50 | return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) << | |
51 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
52 | } | |
53 | ||
54 | static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb, | |
55 | ext4_group_t group) { | |
56 | group = ext4_meta_bg_first_group(sb, group); | |
57 | return ext4_group_first_block_no(sb, group); | |
58 | } | |
59 | ||
60 | static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb, | |
61 | ext4_group_t group) { | |
62 | ext4_grpblk_t overhead; | |
63 | overhead = ext4_bg_num_gdb(sb, group); | |
64 | if (ext4_bg_has_super(sb, group)) | |
65 | overhead += 1 + | |
66 | le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); | |
67 | return overhead; | |
68 | } | |
69 | ||
ac27a0ec DK |
70 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
71 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
72 | ||
73 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 74 | struct ext4_new_group_data *input) |
ac27a0ec | 75 | { |
617ba13b MC |
76 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
77 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 78 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 79 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 80 | ext4_group_t group = input->group; |
617ba13b | 81 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
b302ef2d TT |
82 | unsigned overhead; |
83 | ext4_fsblk_t metaend; | |
ac27a0ec | 84 | struct buffer_head *bh = NULL; |
3a5b2ecd | 85 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
86 | int err = -EINVAL; |
87 | ||
b302ef2d TT |
88 | if (group != sbi->s_groups_count) { |
89 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", | |
90 | input->group, sbi->s_groups_count); | |
91 | return -EINVAL; | |
92 | } | |
93 | ||
94 | overhead = ext4_group_overhead_blocks(sb, group); | |
95 | metaend = start + overhead; | |
ac27a0ec DK |
96 | input->free_blocks_count = free_blocks_count = |
97 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; | |
98 | ||
99 | if (test_opt(sb, DEBUG)) | |
617ba13b | 100 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 101 | "(%d free, %u reserved)\n", |
617ba13b | 102 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
103 | "no-super", input->group, input->blocks_count, |
104 | free_blocks_count, input->reserved_blocks); | |
105 | ||
3a5b2ecd | 106 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
b302ef2d | 107 | if (offset != 0) |
12062ddd | 108 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 109 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 110 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
111 | input->reserved_blocks); |
112 | else if (free_blocks_count < 0) | |
12062ddd | 113 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
114 | input->blocks_count); |
115 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 116 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
117 | end - 1); |
118 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 119 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 120 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 121 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 122 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 123 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 124 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 125 | outside(itend - 1, start, end)) |
12062ddd | 126 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 127 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 128 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 129 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 130 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 131 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
132 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
133 | "(%llu-%llu)", | |
1939e49a RD |
134 | (unsigned long long)input->block_bitmap, |
135 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 136 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
137 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
138 | "(%llu-%llu)", | |
1939e49a RD |
139 | (unsigned long long)input->inode_bitmap, |
140 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 141 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 142 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
143 | (unsigned long long)input->block_bitmap, |
144 | start, metaend - 1); | |
ac27a0ec | 145 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 146 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
147 | (unsigned long long)input->inode_bitmap, |
148 | start, metaend - 1); | |
ac27a0ec | 149 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 150 | inside(itend - 1, start, metaend)) |
12062ddd ES |
151 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
152 | "(%llu-%llu)", | |
1939e49a RD |
153 | (unsigned long long)input->inode_table, |
154 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
155 | else |
156 | err = 0; | |
157 | brelse(bh); | |
158 | ||
159 | return err; | |
160 | } | |
161 | ||
28c7bac0 YY |
162 | /* |
163 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
164 | * group each time. | |
165 | */ | |
166 | struct ext4_new_flex_group_data { | |
167 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
168 | in the flex group */ | |
169 | __u16 *bg_flags; /* block group flags of groups | |
170 | in @groups */ | |
171 | ext4_group_t count; /* number of groups in @groups | |
172 | */ | |
173 | }; | |
174 | ||
175 | /* | |
176 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
177 | * @flexbg_size. | |
178 | * | |
179 | * Returns NULL on failure otherwise address of the allocated structure. | |
180 | */ | |
181 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
182 | { | |
183 | struct ext4_new_flex_group_data *flex_gd; | |
184 | ||
185 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
186 | if (flex_gd == NULL) | |
187 | goto out3; | |
188 | ||
967ac8af HC |
189 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) |
190 | goto out2; | |
28c7bac0 YY |
191 | flex_gd->count = flexbg_size; |
192 | ||
193 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
194 | flexbg_size, GFP_NOFS); | |
195 | if (flex_gd->groups == NULL) | |
196 | goto out2; | |
197 | ||
198 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
199 | if (flex_gd->bg_flags == NULL) | |
200 | goto out1; | |
201 | ||
202 | return flex_gd; | |
203 | ||
204 | out1: | |
205 | kfree(flex_gd->groups); | |
206 | out2: | |
207 | kfree(flex_gd); | |
208 | out3: | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
213 | { | |
214 | kfree(flex_gd->bg_flags); | |
215 | kfree(flex_gd->groups); | |
216 | kfree(flex_gd); | |
217 | } | |
218 | ||
3fbea4b3 YY |
219 | /* |
220 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
221 | * and inode tables for a flex group. | |
222 | * | |
223 | * This function is used by 64bit-resize. Note that this function allocates | |
224 | * group tables from the 1st group of groups contained by @flexgd, which may | |
225 | * be a partial of a flex group. | |
226 | * | |
227 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
228 | * |
229 | * Returns 0 on a successful allocation of the metadata blocks in the | |
230 | * block group. | |
3fbea4b3 | 231 | */ |
03c1c290 | 232 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
233 | struct ext4_new_flex_group_data *flex_gd, |
234 | int flexbg_size) | |
235 | { | |
236 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
3fbea4b3 YY |
237 | ext4_fsblk_t start_blk; |
238 | ext4_fsblk_t last_blk; | |
239 | ext4_group_t src_group; | |
240 | ext4_group_t bb_index = 0; | |
241 | ext4_group_t ib_index = 0; | |
242 | ext4_group_t it_index = 0; | |
243 | ext4_group_t group; | |
244 | ext4_group_t last_group; | |
245 | unsigned overhead; | |
246 | ||
247 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
248 | ||
249 | src_group = group_data[0].group; | |
250 | last_group = src_group + flex_gd->count - 1; | |
251 | ||
252 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
253 | (last_group & ~(flexbg_size - 1)))); | |
254 | next_group: | |
255 | group = group_data[0].group; | |
03c1c290 YY |
256 | if (src_group >= group_data[0].group + flex_gd->count) |
257 | return -ENOSPC; | |
3fbea4b3 YY |
258 | start_blk = ext4_group_first_block_no(sb, src_group); |
259 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
260 | ||
01f795f9 | 261 | overhead = ext4_group_overhead_blocks(sb, src_group); |
3fbea4b3 YY |
262 | |
263 | start_blk += overhead; | |
264 | ||
3fbea4b3 YY |
265 | /* We collect contiguous blocks as much as possible. */ |
266 | src_group++; | |
01f795f9 YY |
267 | for (; src_group <= last_group; src_group++) { |
268 | overhead = ext4_group_overhead_blocks(sb, src_group); | |
269 | if (overhead != 0) | |
3fbea4b3 YY |
270 | last_blk += group_data[src_group - group].blocks_count; |
271 | else | |
272 | break; | |
01f795f9 | 273 | } |
3fbea4b3 YY |
274 | |
275 | /* Allocate block bitmaps */ | |
276 | for (; bb_index < flex_gd->count; bb_index++) { | |
277 | if (start_blk >= last_blk) | |
278 | goto next_group; | |
279 | group_data[bb_index].block_bitmap = start_blk++; | |
bd86298e | 280 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 YY |
281 | group -= group_data[0].group; |
282 | group_data[group].free_blocks_count--; | |
283 | if (flexbg_size > 1) | |
284 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
285 | } | |
286 | ||
287 | /* Allocate inode bitmaps */ | |
288 | for (; ib_index < flex_gd->count; ib_index++) { | |
289 | if (start_blk >= last_blk) | |
290 | goto next_group; | |
291 | group_data[ib_index].inode_bitmap = start_blk++; | |
bd86298e | 292 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 YY |
293 | group -= group_data[0].group; |
294 | group_data[group].free_blocks_count--; | |
295 | if (flexbg_size > 1) | |
296 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
297 | } | |
298 | ||
299 | /* Allocate inode tables */ | |
300 | for (; it_index < flex_gd->count; it_index++) { | |
301 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) | |
302 | goto next_group; | |
303 | group_data[it_index].inode_table = start_blk; | |
bd86298e | 304 | group = ext4_get_group_number(sb, start_blk - 1); |
3fbea4b3 YY |
305 | group -= group_data[0].group; |
306 | group_data[group].free_blocks_count -= | |
307 | EXT4_SB(sb)->s_itb_per_group; | |
308 | if (flexbg_size > 1) | |
309 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
310 | ||
311 | start_blk += EXT4_SB(sb)->s_itb_per_group; | |
312 | } | |
313 | ||
314 | if (test_opt(sb, DEBUG)) { | |
315 | int i; | |
316 | group = group_data[0].group; | |
317 | ||
318 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
319 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
320 | flexbg_size); | |
321 | ||
322 | for (i = 0; i < flex_gd->count; i++) { | |
323 | printk(KERN_DEBUG "adding %s group %u: %u " | |
324 | "blocks (%d free)\n", | |
325 | ext4_bg_has_super(sb, group + i) ? "normal" : | |
326 | "no-super", group + i, | |
327 | group_data[i].blocks_count, | |
328 | group_data[i].free_blocks_count); | |
329 | } | |
330 | } | |
03c1c290 | 331 | return 0; |
3fbea4b3 YY |
332 | } |
333 | ||
ac27a0ec | 334 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 335 | ext4_fsblk_t blk) |
ac27a0ec DK |
336 | { |
337 | struct buffer_head *bh; | |
338 | int err; | |
339 | ||
340 | bh = sb_getblk(sb, blk); | |
aebf0243 | 341 | if (unlikely(!bh)) |
860d21e2 | 342 | return ERR_PTR(-ENOMEM); |
617ba13b | 343 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
344 | brelse(bh); |
345 | bh = ERR_PTR(err); | |
346 | } else { | |
ac27a0ec DK |
347 | memset(bh->b_data, 0, sb->s_blocksize); |
348 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
349 | } |
350 | ||
351 | return bh; | |
352 | } | |
353 | ||
14904107 ES |
354 | /* |
355 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
356 | * If that fails, restart the transaction & regain write access for the | |
357 | * buffer head which is used for block_bitmap modifications. | |
358 | */ | |
6d40bc5a | 359 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
360 | { |
361 | int err; | |
362 | ||
0390131b | 363 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
364 | return 0; |
365 | ||
366 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
367 | if (err < 0) | |
368 | return err; | |
369 | if (err) { | |
6d40bc5a YY |
370 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
371 | if (err) | |
14904107 | 372 | return err; |
2b2d6d01 | 373 | } |
14904107 ES |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
33afdcc5 YY |
378 | /* |
379 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
380 | * | |
381 | * Helper function for ext4_setup_new_group_blocks() which set . | |
382 | * | |
383 | * @sb: super block | |
384 | * @handle: journal handle | |
385 | * @flex_gd: flex group data | |
386 | */ | |
387 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
388 | struct ext4_new_flex_group_data *flex_gd, | |
389 | ext4_fsblk_t block, ext4_group_t count) | |
390 | { | |
391 | ext4_group_t count2; | |
392 | ||
393 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
394 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
395 | ext4_fsblk_t start; | |
396 | struct buffer_head *bh; | |
397 | ext4_group_t group; | |
398 | int err; | |
399 | ||
bd86298e | 400 | group = ext4_get_group_number(sb, block); |
33afdcc5 YY |
401 | start = ext4_group_first_block_no(sb, group); |
402 | group -= flex_gd->groups[0].group; | |
403 | ||
404 | count2 = sb->s_blocksize * 8 - (block - start); | |
405 | if (count2 > count) | |
406 | count2 = count; | |
407 | ||
408 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
409 | BUG_ON(flex_gd->count > 1); | |
410 | continue; | |
411 | } | |
412 | ||
413 | err = extend_or_restart_transaction(handle, 1); | |
414 | if (err) | |
415 | return err; | |
416 | ||
417 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
aebf0243 | 418 | if (unlikely(!bh)) |
860d21e2 | 419 | return -ENOMEM; |
33afdcc5 YY |
420 | |
421 | err = ext4_journal_get_write_access(handle, bh); | |
422 | if (err) | |
423 | return err; | |
424 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
425 | block - start, count2); | |
426 | ext4_set_bits(bh->b_data, block - start, count2); | |
427 | ||
428 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
429 | if (unlikely(err)) | |
430 | return err; | |
431 | brelse(bh); | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
439 | * This doesn't need to be part of the main transaction, since we are only | |
440 | * changing blocks outside the actual filesystem. We still do journaling to | |
441 | * ensure the recovery is correct in case of a failure just after resize. | |
442 | * If any part of this fails, we simply abort the resize. | |
443 | * | |
444 | * setup_new_flex_group_blocks handles a flex group as follow: | |
445 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
446 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
447 | * super block and GDT. | |
448 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
449 | * bitmap for blocks taken by group tables. | |
450 | */ | |
451 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
452 | struct ext4_new_flex_group_data *flex_gd) | |
453 | { | |
454 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
455 | ext4_fsblk_t start; | |
456 | ext4_fsblk_t block; | |
457 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
458 | struct ext4_super_block *es = sbi->s_es; | |
459 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
460 | __u16 *bg_flags = flex_gd->bg_flags; | |
461 | handle_t *handle; | |
462 | ext4_group_t group, count; | |
463 | struct buffer_head *bh = NULL; | |
464 | int reserved_gdb, i, j, err = 0, err2; | |
01f795f9 | 465 | int meta_bg; |
33afdcc5 YY |
466 | |
467 | BUG_ON(!flex_gd->count || !group_data || | |
468 | group_data[0].group != sbi->s_groups_count); | |
469 | ||
470 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
01f795f9 | 471 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
33afdcc5 YY |
472 | |
473 | /* This transaction may be extended/restarted along the way */ | |
9924a92a | 474 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
33afdcc5 YY |
475 | if (IS_ERR(handle)) |
476 | return PTR_ERR(handle); | |
477 | ||
478 | group = group_data[0].group; | |
479 | for (i = 0; i < flex_gd->count; i++, group++) { | |
480 | unsigned long gdblocks; | |
01f795f9 | 481 | ext4_grpblk_t overhead; |
33afdcc5 YY |
482 | |
483 | gdblocks = ext4_bg_num_gdb(sb, group); | |
484 | start = ext4_group_first_block_no(sb, group); | |
485 | ||
01f795f9 | 486 | if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) |
6df935ad YY |
487 | goto handle_itb; |
488 | ||
01f795f9 YY |
489 | if (meta_bg == 1) { |
490 | ext4_group_t first_group; | |
491 | first_group = ext4_meta_bg_first_group(sb, group); | |
492 | if (first_group != group + 1 && | |
493 | first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) | |
494 | goto handle_itb; | |
495 | } | |
496 | ||
497 | block = start + ext4_bg_has_super(sb, group); | |
33afdcc5 | 498 | /* Copy all of the GDT blocks into the backup in this group */ |
01f795f9 | 499 | for (j = 0; j < gdblocks; j++, block++) { |
33afdcc5 YY |
500 | struct buffer_head *gdb; |
501 | ||
502 | ext4_debug("update backup group %#04llx\n", block); | |
503 | err = extend_or_restart_transaction(handle, 1); | |
504 | if (err) | |
505 | goto out; | |
506 | ||
507 | gdb = sb_getblk(sb, block); | |
aebf0243 | 508 | if (unlikely(!gdb)) { |
860d21e2 | 509 | err = -ENOMEM; |
33afdcc5 YY |
510 | goto out; |
511 | } | |
512 | ||
513 | err = ext4_journal_get_write_access(handle, gdb); | |
514 | if (err) { | |
515 | brelse(gdb); | |
516 | goto out; | |
517 | } | |
518 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
519 | gdb->b_size); | |
520 | set_buffer_uptodate(gdb); | |
521 | ||
522 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
523 | if (unlikely(err)) { | |
524 | brelse(gdb); | |
525 | goto out; | |
526 | } | |
527 | brelse(gdb); | |
528 | } | |
529 | ||
530 | /* Zero out all of the reserved backup group descriptor | |
531 | * table blocks | |
532 | */ | |
533 | if (ext4_bg_has_super(sb, group)) { | |
534 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
535 | reserved_gdb, GFP_NOFS); | |
536 | if (err) | |
537 | goto out; | |
538 | } | |
539 | ||
6df935ad | 540 | handle_itb: |
33afdcc5 YY |
541 | /* Initialize group tables of the grop @group */ |
542 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
543 | goto handle_bb; | |
544 | ||
545 | /* Zero out all of the inode table blocks */ | |
546 | block = group_data[i].inode_table; | |
547 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
548 | block, sbi->s_itb_per_group); | |
549 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
550 | GFP_NOFS); | |
551 | if (err) | |
552 | goto out; | |
553 | ||
554 | handle_bb: | |
555 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
556 | goto handle_ib; | |
557 | ||
558 | /* Initialize block bitmap of the @group */ | |
559 | block = group_data[i].block_bitmap; | |
560 | err = extend_or_restart_transaction(handle, 1); | |
561 | if (err) | |
562 | goto out; | |
563 | ||
564 | bh = bclean(handle, sb, block); | |
565 | if (IS_ERR(bh)) { | |
566 | err = PTR_ERR(bh); | |
567 | goto out; | |
568 | } | |
01f795f9 YY |
569 | overhead = ext4_group_overhead_blocks(sb, group); |
570 | if (overhead != 0) { | |
33afdcc5 YY |
571 | ext4_debug("mark backup superblock %#04llx (+0)\n", |
572 | start); | |
01f795f9 | 573 | ext4_set_bits(bh->b_data, 0, overhead); |
33afdcc5 YY |
574 | } |
575 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
576 | sb->s_blocksize * 8, bh->b_data); | |
577 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
578 | if (err) | |
579 | goto out; | |
580 | brelse(bh); | |
581 | ||
582 | handle_ib: | |
583 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
584 | continue; | |
585 | ||
586 | /* Initialize inode bitmap of the @group */ | |
587 | block = group_data[i].inode_bitmap; | |
588 | err = extend_or_restart_transaction(handle, 1); | |
589 | if (err) | |
590 | goto out; | |
591 | /* Mark unused entries in inode bitmap used */ | |
592 | bh = bclean(handle, sb, block); | |
593 | if (IS_ERR(bh)) { | |
594 | err = PTR_ERR(bh); | |
595 | goto out; | |
596 | } | |
597 | ||
598 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
599 | sb->s_blocksize * 8, bh->b_data); | |
600 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
601 | if (err) | |
602 | goto out; | |
603 | brelse(bh); | |
604 | } | |
605 | bh = NULL; | |
606 | ||
607 | /* Mark group tables in block bitmap */ | |
608 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
609 | count = group_table_count[j]; | |
610 | start = (&group_data[0].block_bitmap)[j]; | |
611 | block = start; | |
612 | for (i = 1; i < flex_gd->count; i++) { | |
613 | block += group_table_count[j]; | |
614 | if (block == (&group_data[i].block_bitmap)[j]) { | |
615 | count += group_table_count[j]; | |
616 | continue; | |
617 | } | |
618 | err = set_flexbg_block_bitmap(sb, handle, | |
619 | flex_gd, start, count); | |
620 | if (err) | |
621 | goto out; | |
622 | count = group_table_count[j]; | |
623 | start = group_data[i].block_bitmap; | |
624 | block = start; | |
625 | } | |
626 | ||
627 | if (count) { | |
628 | err = set_flexbg_block_bitmap(sb, handle, | |
629 | flex_gd, start, count); | |
630 | if (err) | |
631 | goto out; | |
632 | } | |
633 | } | |
634 | ||
635 | out: | |
636 | brelse(bh); | |
637 | err2 = ext4_journal_stop(handle); | |
638 | if (err2 && !err) | |
639 | err = err2; | |
640 | ||
641 | return err; | |
642 | } | |
643 | ||
ac27a0ec DK |
644 | /* |
645 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 646 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
647 | * calling this for the first time. In a sparse filesystem it will be the |
648 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
649 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
650 | */ | |
617ba13b | 651 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
652 | unsigned *five, unsigned *seven) |
653 | { | |
654 | unsigned *min = three; | |
655 | int mult = 3; | |
656 | unsigned ret; | |
657 | ||
617ba13b MC |
658 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
659 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
660 | ret = *min; |
661 | *min += 1; | |
662 | return ret; | |
663 | } | |
664 | ||
665 | if (*five < *min) { | |
666 | min = five; | |
667 | mult = 5; | |
668 | } | |
669 | if (*seven < *min) { | |
670 | min = seven; | |
671 | mult = 7; | |
672 | } | |
673 | ||
674 | ret = *min; | |
675 | *min *= mult; | |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
680 | /* | |
681 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
682 | * It is assumed that they are stored in group order. Returns the number of | |
683 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
684 | */ | |
685 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 686 | ext4_group_t end, |
ac27a0ec DK |
687 | struct buffer_head *primary) |
688 | { | |
617ba13b | 689 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
690 | unsigned three = 1; |
691 | unsigned five = 5; | |
692 | unsigned seven = 7; | |
693 | unsigned grp; | |
694 | __le32 *p = (__le32 *)primary->b_data; | |
695 | int gdbackups = 0; | |
696 | ||
617ba13b | 697 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
698 | if (le32_to_cpu(*p++) != |
699 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 700 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 701 | " missing grp %d (%llu)", |
ac27a0ec | 702 | blk, grp, |
bd81d8ee LV |
703 | grp * |
704 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
705 | blk); | |
ac27a0ec DK |
706 | return -EINVAL; |
707 | } | |
617ba13b | 708 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
709 | return -EFBIG; |
710 | } | |
711 | ||
712 | return gdbackups; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Called when we need to bring a reserved group descriptor table block into | |
717 | * use from the resize inode. The primary copy of the new GDT block currently | |
718 | * is an indirect block (under the double indirect block in the resize inode). | |
719 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
720 | * block, in group order. Even though we know all the block numbers we need, | |
721 | * we check to ensure that the resize inode has actually reserved these blocks. | |
722 | * | |
723 | * Don't need to update the block bitmaps because the blocks are still in use. | |
724 | * | |
725 | * We get all of the error cases out of the way, so that we are sure to not | |
726 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
727 | */ | |
728 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 729 | ext4_group_t group) |
ac27a0ec DK |
730 | { |
731 | struct super_block *sb = inode->i_sb; | |
617ba13b | 732 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 733 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 734 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
735 | struct buffer_head **o_group_desc, **n_group_desc; |
736 | struct buffer_head *dind; | |
2f919710 | 737 | struct buffer_head *gdb_bh; |
ac27a0ec | 738 | int gdbackups; |
617ba13b | 739 | struct ext4_iloc iloc; |
ac27a0ec DK |
740 | __le32 *data; |
741 | int err; | |
742 | ||
743 | if (test_opt(sb, DEBUG)) | |
744 | printk(KERN_DEBUG | |
617ba13b | 745 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
746 | gdb_num); |
747 | ||
af5bc92d TT |
748 | /* |
749 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
750 | * because the user tools have no way of handling this. Probably a |
751 | * bad time to do it anyways. | |
752 | */ | |
617ba13b MC |
753 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
754 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 755 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 756 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
757 | return -EPERM; |
758 | } | |
759 | ||
2f919710 YY |
760 | gdb_bh = sb_bread(sb, gdblock); |
761 | if (!gdb_bh) | |
ac27a0ec DK |
762 | return -EIO; |
763 | ||
c72df9f9 | 764 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 765 | if (gdbackups < 0) { |
ac27a0ec DK |
766 | err = gdbackups; |
767 | goto exit_bh; | |
768 | } | |
769 | ||
617ba13b | 770 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
771 | dind = sb_bread(sb, le32_to_cpu(*data)); |
772 | if (!dind) { | |
773 | err = -EIO; | |
774 | goto exit_bh; | |
775 | } | |
776 | ||
777 | data = (__le32 *)dind->b_data; | |
617ba13b | 778 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 779 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 780 | group, gdblock); |
ac27a0ec DK |
781 | err = -EINVAL; |
782 | goto exit_dind; | |
783 | } | |
784 | ||
b4097142 TT |
785 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
786 | if (unlikely(err)) | |
ac27a0ec DK |
787 | goto exit_dind; |
788 | ||
2f919710 | 789 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 790 | if (unlikely(err)) |
37be2f59 | 791 | goto exit_dind; |
ac27a0ec | 792 | |
b4097142 TT |
793 | err = ext4_journal_get_write_access(handle, dind); |
794 | if (unlikely(err)) | |
795 | ext4_std_error(sb, err); | |
ac27a0ec | 796 | |
617ba13b | 797 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
798 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
799 | if (unlikely(err)) | |
37be2f59 | 800 | goto exit_dind; |
ac27a0ec | 801 | |
f18a5f21 TT |
802 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
803 | sizeof(struct buffer_head *), | |
804 | GFP_NOFS); | |
ac27a0ec DK |
805 | if (!n_group_desc) { |
806 | err = -ENOMEM; | |
f18a5f21 TT |
807 | ext4_warning(sb, "not enough memory for %lu groups", |
808 | gdb_num + 1); | |
ac27a0ec DK |
809 | goto exit_inode; |
810 | } | |
811 | ||
812 | /* | |
813 | * Finally, we have all of the possible failures behind us... | |
814 | * | |
815 | * Remove new GDT block from inode double-indirect block and clear out | |
816 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
817 | * from the reserved inode). We don't need to change the bitmaps for | |
818 | * these blocks, because they are marked as in-use from being in the | |
819 | * reserved inode, and will become GDT blocks (primary and backup). | |
820 | */ | |
617ba13b | 821 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
822 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
823 | if (unlikely(err)) { | |
824 | ext4_std_error(sb, err); | |
825 | goto exit_inode; | |
826 | } | |
ac27a0ec | 827 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 828 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
829 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
830 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
831 | if (unlikely(err)) { |
832 | ext4_std_error(sb, err); | |
833 | goto exit_inode; | |
834 | } | |
835 | brelse(dind); | |
ac27a0ec | 836 | |
617ba13b | 837 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 838 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 839 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 840 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
841 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
842 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 843 | ext4_kvfree(o_group_desc); |
ac27a0ec | 844 | |
e8546d06 | 845 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 846 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
847 | if (err) |
848 | ext4_std_error(sb, err); | |
ac27a0ec | 849 | |
b4097142 | 850 | return err; |
ac27a0ec DK |
851 | |
852 | exit_inode: | |
f18a5f21 | 853 | ext4_kvfree(n_group_desc); |
ac27a0ec | 854 | brelse(iloc.bh); |
ac27a0ec DK |
855 | exit_dind: |
856 | brelse(dind); | |
857 | exit_bh: | |
2f919710 | 858 | brelse(gdb_bh); |
ac27a0ec | 859 | |
617ba13b | 860 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
861 | return err; |
862 | } | |
863 | ||
01f795f9 YY |
864 | /* |
865 | * add_new_gdb_meta_bg is the sister of add_new_gdb. | |
866 | */ | |
867 | static int add_new_gdb_meta_bg(struct super_block *sb, | |
868 | handle_t *handle, ext4_group_t group) { | |
869 | ext4_fsblk_t gdblock; | |
870 | struct buffer_head *gdb_bh; | |
871 | struct buffer_head **o_group_desc, **n_group_desc; | |
872 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
873 | int err; | |
874 | ||
875 | gdblock = ext4_meta_bg_first_block_no(sb, group) + | |
876 | ext4_bg_has_super(sb, group); | |
877 | gdb_bh = sb_bread(sb, gdblock); | |
878 | if (!gdb_bh) | |
879 | return -EIO; | |
880 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * | |
881 | sizeof(struct buffer_head *), | |
882 | GFP_NOFS); | |
883 | if (!n_group_desc) { | |
884 | err = -ENOMEM; | |
885 | ext4_warning(sb, "not enough memory for %lu groups", | |
886 | gdb_num + 1); | |
887 | return err; | |
888 | } | |
889 | ||
890 | o_group_desc = EXT4_SB(sb)->s_group_desc; | |
891 | memcpy(n_group_desc, o_group_desc, | |
892 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); | |
893 | n_group_desc[gdb_num] = gdb_bh; | |
894 | EXT4_SB(sb)->s_group_desc = n_group_desc; | |
895 | EXT4_SB(sb)->s_gdb_count++; | |
896 | ext4_kvfree(o_group_desc); | |
897 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
898 | if (unlikely(err)) | |
899 | brelse(gdb_bh); | |
900 | return err; | |
901 | } | |
902 | ||
ac27a0ec DK |
903 | /* |
904 | * Called when we are adding a new group which has a backup copy of each of | |
905 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
906 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
907 | * that they are kept for future resizing and not allocated to files. | |
908 | * | |
909 | * Each reserved backup GDT block will go into a different indirect block. | |
910 | * The indirect blocks are actually the primary reserved GDT blocks, | |
911 | * so we know in advance what their block numbers are. We only get the | |
912 | * double-indirect block to verify it is pointing to the primary reserved | |
913 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
914 | * backup GDT blocks are stored in their reserved primary GDT block. | |
915 | */ | |
916 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 917 | ext4_group_t group) |
ac27a0ec DK |
918 | { |
919 | struct super_block *sb = inode->i_sb; | |
617ba13b | 920 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
921 | struct buffer_head **primary; |
922 | struct buffer_head *dind; | |
617ba13b MC |
923 | struct ext4_iloc iloc; |
924 | ext4_fsblk_t blk; | |
ac27a0ec DK |
925 | __le32 *data, *end; |
926 | int gdbackups = 0; | |
927 | int res, i; | |
928 | int err; | |
929 | ||
216553c4 | 930 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
931 | if (!primary) |
932 | return -ENOMEM; | |
933 | ||
617ba13b | 934 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
935 | dind = sb_bread(sb, le32_to_cpu(*data)); |
936 | if (!dind) { | |
937 | err = -EIO; | |
938 | goto exit_free; | |
939 | } | |
940 | ||
617ba13b | 941 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
942 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
943 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 944 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
945 | |
946 | /* Get each reserved primary GDT block and verify it holds backups */ | |
947 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
948 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 949 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
950 | " not at offset %ld", |
951 | blk, | |
952 | (long)(data - (__le32 *)dind->b_data)); | |
953 | err = -EINVAL; | |
954 | goto exit_bh; | |
955 | } | |
956 | primary[res] = sb_bread(sb, blk); | |
957 | if (!primary[res]) { | |
958 | err = -EIO; | |
959 | goto exit_bh; | |
960 | } | |
c72df9f9 YY |
961 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
962 | if (gdbackups < 0) { | |
ac27a0ec DK |
963 | brelse(primary[res]); |
964 | err = gdbackups; | |
965 | goto exit_bh; | |
966 | } | |
967 | if (++data >= end) | |
968 | data = (__le32 *)dind->b_data; | |
969 | } | |
970 | ||
971 | for (i = 0; i < reserved_gdb; i++) { | |
37be2f59 | 972 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) |
ac27a0ec | 973 | goto exit_bh; |
ac27a0ec DK |
974 | } |
975 | ||
617ba13b | 976 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
977 | goto exit_bh; |
978 | ||
979 | /* | |
980 | * Finally we can add each of the reserved backup GDT blocks from | |
981 | * the new group to its reserved primary GDT block. | |
982 | */ | |
668f4dc5 | 983 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
984 | for (i = 0; i < reserved_gdb; i++) { |
985 | int err2; | |
986 | data = (__le32 *)primary[i]->b_data; | |
987 | /* printk("reserving backup %lu[%u] = %lu\n", | |
988 | primary[i]->b_blocknr, gdbackups, | |
989 | blk + primary[i]->b_blocknr); */ | |
990 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 991 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
992 | if (!err) |
993 | err = err2; | |
994 | } | |
995 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 996 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
997 | |
998 | exit_bh: | |
999 | while (--res >= 0) | |
1000 | brelse(primary[res]); | |
1001 | brelse(dind); | |
1002 | ||
1003 | exit_free: | |
1004 | kfree(primary); | |
1005 | ||
1006 | return err; | |
1007 | } | |
1008 | ||
1009 | /* | |
617ba13b | 1010 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
1011 | * of the main resize transaction, because e2fsck will re-write them if there |
1012 | * is a problem (basically only OOM will cause a problem). However, we | |
1013 | * _should_ update the backups if possible, in case the primary gets trashed | |
1014 | * for some reason and we need to run e2fsck from a backup superblock. The | |
1015 | * important part is that the new block and inode counts are in the backup | |
1016 | * superblocks, and the location of the new group metadata in the GDT backups. | |
1017 | * | |
32ed5058 TT |
1018 | * We do not need take the s_resize_lock for this, because these |
1019 | * blocks are not otherwise touched by the filesystem code when it is | |
1020 | * mounted. We don't need to worry about last changing from | |
1021 | * sbi->s_groups_count, because the worst that can happen is that we | |
1022 | * do not copy the full number of backups at this time. The resize | |
1023 | * which changed s_groups_count will backup again. | |
ac27a0ec | 1024 | */ |
01f795f9 YY |
1025 | static void update_backups(struct super_block *sb, int blk_off, char *data, |
1026 | int size, int meta_bg) | |
ac27a0ec | 1027 | { |
617ba13b | 1028 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
01f795f9 | 1029 | ext4_group_t last; |
617ba13b | 1030 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1031 | unsigned three = 1; |
1032 | unsigned five = 5; | |
1033 | unsigned seven = 7; | |
01f795f9 | 1034 | ext4_group_t group = 0; |
ac27a0ec DK |
1035 | int rest = sb->s_blocksize - size; |
1036 | handle_t *handle; | |
1037 | int err = 0, err2; | |
1038 | ||
9924a92a | 1039 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
1040 | if (IS_ERR(handle)) { |
1041 | group = 1; | |
1042 | err = PTR_ERR(handle); | |
1043 | goto exit_err; | |
1044 | } | |
1045 | ||
01f795f9 YY |
1046 | if (meta_bg == 0) { |
1047 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1048 | last = sbi->s_groups_count; | |
1049 | } else { | |
1050 | group = ext4_meta_bg_first_group(sb, group) + 1; | |
1051 | last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2); | |
1052 | } | |
1053 | ||
1054 | while (group < sbi->s_groups_count) { | |
ac27a0ec | 1055 | struct buffer_head *bh; |
01f795f9 | 1056 | ext4_fsblk_t backup_block; |
ac27a0ec DK |
1057 | |
1058 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
1059 | if (ext4_handle_valid(handle) && |
1060 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
1061 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
1062 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
1063 | break; |
1064 | ||
01f795f9 YY |
1065 | if (meta_bg == 0) |
1066 | backup_block = group * bpg + blk_off; | |
1067 | else | |
1068 | backup_block = (ext4_group_first_block_no(sb, group) + | |
1069 | ext4_bg_has_super(sb, group)); | |
1070 | ||
1071 | bh = sb_getblk(sb, backup_block); | |
aebf0243 | 1072 | if (unlikely(!bh)) { |
860d21e2 | 1073 | err = -ENOMEM; |
ac27a0ec DK |
1074 | break; |
1075 | } | |
01f795f9 YY |
1076 | ext4_debug("update metadata backup %llu(+%llu)\n", |
1077 | backup_block, backup_block - | |
1078 | ext4_group_first_block_no(sb, group)); | |
617ba13b | 1079 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1080 | break; |
1081 | lock_buffer(bh); | |
1082 | memcpy(bh->b_data, data, size); | |
1083 | if (rest) | |
1084 | memset(bh->b_data + size, 0, rest); | |
1085 | set_buffer_uptodate(bh); | |
1086 | unlock_buffer(bh); | |
b4097142 TT |
1087 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1088 | if (unlikely(err)) | |
1089 | ext4_std_error(sb, err); | |
ac27a0ec | 1090 | brelse(bh); |
01f795f9 YY |
1091 | |
1092 | if (meta_bg == 0) | |
1093 | group = ext4_list_backups(sb, &three, &five, &seven); | |
1094 | else if (group == last) | |
1095 | break; | |
1096 | else | |
1097 | group = last; | |
ac27a0ec | 1098 | } |
617ba13b | 1099 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1100 | err = err2; |
1101 | ||
1102 | /* | |
1103 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1104 | * late to revert the resize, we shouldn't fail just because of | |
1105 | * the backup copies (they are only needed in case of corruption). | |
1106 | * | |
1107 | * However, if we got here we have a journal problem too, so we | |
1108 | * can't really start a transaction to mark the superblock. | |
1109 | * Chicken out and just set the flag on the hope it will be written | |
1110 | * to disk, and if not - we will simply wait until next fsck. | |
1111 | */ | |
1112 | exit_err: | |
1113 | if (err) { | |
12062ddd | 1114 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1115 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1116 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1117 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1118 | mark_buffer_dirty(sbi->s_sbh); |
1119 | } | |
1120 | } | |
1121 | ||
bb08c1e7 YY |
1122 | /* |
1123 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1124 | * starting at @group | |
1125 | * | |
1126 | * @handle: journal handle | |
1127 | * @sb: super block | |
1128 | * @group: the group no. of the first group desc to be added | |
1129 | * @resize_inode: the resize inode | |
1130 | * @count: number of group descriptors to be added | |
1131 | */ | |
1132 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1133 | ext4_group_t group, struct inode *resize_inode, | |
1134 | ext4_group_t count) | |
1135 | { | |
1136 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1137 | struct ext4_super_block *es = sbi->s_es; | |
1138 | struct buffer_head *gdb_bh; | |
1139 | int i, gdb_off, gdb_num, err = 0; | |
01f795f9 | 1140 | int meta_bg; |
bb08c1e7 | 1141 | |
01f795f9 | 1142 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
bb08c1e7 YY |
1143 | for (i = 0; i < count; i++, group++) { |
1144 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1145 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1146 | ||
1147 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1148 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1149 | ||
1150 | /* | |
1151 | * We will only either add reserved group blocks to a backup group | |
1152 | * or remove reserved blocks for the first group in a new group block. | |
1153 | * Doing both would be mean more complex code, and sane people don't | |
1154 | * use non-sparse filesystems anymore. This is already checked above. | |
1155 | */ | |
1156 | if (gdb_off) { | |
1157 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1158 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1159 | ||
1160 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1161 | err = reserve_backup_gdb(handle, resize_inode, group); | |
01f795f9 YY |
1162 | } else if (meta_bg != 0) { |
1163 | err = add_new_gdb_meta_bg(sb, handle, group); | |
1164 | } else { | |
bb08c1e7 | 1165 | err = add_new_gdb(handle, resize_inode, group); |
01f795f9 | 1166 | } |
bb08c1e7 YY |
1167 | if (err) |
1168 | break; | |
1169 | } | |
1170 | return err; | |
1171 | } | |
1172 | ||
41a246d1 DW |
1173 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1174 | { | |
1175 | struct buffer_head *bh = sb_getblk(sb, block); | |
aebf0243 | 1176 | if (unlikely(!bh)) |
41a246d1 | 1177 | return NULL; |
7f1468d1 DM |
1178 | if (!bh_uptodate_or_lock(bh)) { |
1179 | if (bh_submit_read(bh) < 0) { | |
1180 | brelse(bh); | |
1181 | return NULL; | |
1182 | } | |
41a246d1 | 1183 | } |
41a246d1 DW |
1184 | |
1185 | return bh; | |
1186 | } | |
1187 | ||
1188 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1189 | ext4_group_t group, | |
1190 | struct ext4_group_desc *gdp, | |
1191 | struct ext4_new_group_data *group_data) | |
1192 | { | |
1193 | struct buffer_head *bh; | |
1194 | ||
1195 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1196 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
1197 | return 0; | |
1198 | ||
1199 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1200 | if (!bh) | |
1201 | return -EIO; | |
1202 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1203 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1204 | brelse(bh); | |
1205 | ||
fa77dcfa DW |
1206 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1207 | if (!bh) | |
1208 | return -EIO; | |
79f1ba49 | 1209 | ext4_block_bitmap_csum_set(sb, group, gdp, bh); |
fa77dcfa DW |
1210 | brelse(bh); |
1211 | ||
41a246d1 DW |
1212 | return 0; |
1213 | } | |
1214 | ||
083f5b24 YY |
1215 | /* |
1216 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1217 | */ | |
1218 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1219 | struct ext4_new_flex_group_data *flex_gd) | |
1220 | { | |
1221 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1222 | struct ext4_group_desc *gdp; | |
1223 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1224 | struct buffer_head *gdb_bh; | |
1225 | ext4_group_t group; | |
1226 | __u16 *bg_flags = flex_gd->bg_flags; | |
1227 | int i, gdb_off, gdb_num, err = 0; | |
1228 | ||
1229 | ||
1230 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1231 | group = group_data->group; | |
1232 | ||
1233 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1234 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1235 | ||
1236 | /* | |
1237 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1238 | */ | |
1239 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1240 | /* Update group descriptor block for new group */ | |
2716b802 | 1241 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1242 | gdb_off * EXT4_DESC_SIZE(sb)); |
1243 | ||
1244 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1245 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1246 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1247 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1248 | if (err) { | |
1249 | ext4_std_error(sb, err); | |
1250 | break; | |
1251 | } | |
1252 | ||
083f5b24 YY |
1253 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1254 | ext4_free_group_clusters_set(sb, gdp, | |
810da240 | 1255 | EXT4_NUM_B2C(sbi, group_data->free_blocks_count)); |
083f5b24 | 1256 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
93f90526 TT |
1257 | if (ext4_has_group_desc_csum(sb)) |
1258 | ext4_itable_unused_set(sb, gdp, | |
1259 | EXT4_INODES_PER_GROUP(sb)); | |
083f5b24 | 1260 | gdp->bg_flags = cpu_to_le16(*bg_flags); |
feb0ab32 | 1261 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1262 | |
1263 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1264 | if (unlikely(err)) { | |
1265 | ext4_std_error(sb, err); | |
1266 | break; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * We can allocate memory for mb_alloc based on the new group | |
1271 | * descriptor | |
1272 | */ | |
1273 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1274 | if (err) | |
1275 | break; | |
1276 | } | |
1277 | return err; | |
1278 | } | |
1279 | ||
2e10e2f2 YY |
1280 | /* |
1281 | * ext4_update_super() updates the super block so that the newly added | |
1282 | * groups can be seen by the filesystem. | |
1283 | * | |
1284 | * @sb: super block | |
1285 | * @flex_gd: new added groups | |
1286 | */ | |
1287 | static void ext4_update_super(struct super_block *sb, | |
1288 | struct ext4_new_flex_group_data *flex_gd) | |
1289 | { | |
1290 | ext4_fsblk_t blocks_count = 0; | |
1291 | ext4_fsblk_t free_blocks = 0; | |
1292 | ext4_fsblk_t reserved_blocks = 0; | |
1293 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1294 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1295 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1296 | int i; |
2e10e2f2 YY |
1297 | |
1298 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1299 | /* | |
1300 | * Make the new blocks and inodes valid next. We do this before | |
1301 | * increasing the group count so that once the group is enabled, | |
1302 | * all of its blocks and inodes are already valid. | |
1303 | * | |
1304 | * We always allocate group-by-group, then block-by-block or | |
1305 | * inode-by-inode within a group, so enabling these | |
1306 | * blocks/inodes before the group is live won't actually let us | |
1307 | * allocate the new space yet. | |
1308 | */ | |
1309 | for (i = 0; i < flex_gd->count; i++) { | |
1310 | blocks_count += group_data[i].blocks_count; | |
1311 | free_blocks += group_data[i].free_blocks_count; | |
1312 | } | |
1313 | ||
1314 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
01f795f9 | 1315 | reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es)); |
2e10e2f2 YY |
1316 | reserved_blocks *= blocks_count; |
1317 | do_div(reserved_blocks, 100); | |
1318 | ||
1319 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1320 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1321 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1322 | flex_gd->count); | |
636d7e2e DW |
1323 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1324 | flex_gd->count); | |
2e10e2f2 | 1325 | |
01f795f9 | 1326 | ext4_debug("free blocks count %llu", ext4_free_blocks_count(es)); |
2e10e2f2 YY |
1327 | /* |
1328 | * We need to protect s_groups_count against other CPUs seeing | |
1329 | * inconsistent state in the superblock. | |
1330 | * | |
1331 | * The precise rules we use are: | |
1332 | * | |
1333 | * * Writers must perform a smp_wmb() after updating all | |
1334 | * dependent data and before modifying the groups count | |
1335 | * | |
1336 | * * Readers must perform an smp_rmb() after reading the groups | |
1337 | * count and before reading any dependent data. | |
1338 | * | |
1339 | * NB. These rules can be relaxed when checking the group count | |
1340 | * while freeing data, as we can only allocate from a block | |
1341 | * group after serialising against the group count, and we can | |
1342 | * only then free after serialising in turn against that | |
1343 | * allocation. | |
1344 | */ | |
1345 | smp_wmb(); | |
1346 | ||
1347 | /* Update the global fs size fields */ | |
1348 | sbi->s_groups_count += flex_gd->count; | |
c5c72d81 TT |
1349 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, |
1350 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
2e10e2f2 YY |
1351 | |
1352 | /* Update the reserved block counts only once the new group is | |
1353 | * active. */ | |
1354 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1355 | reserved_blocks); | |
1356 | ||
1357 | /* Update the free space counts */ | |
1358 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
810da240 | 1359 | EXT4_NUM_B2C(sbi, free_blocks)); |
2e10e2f2 YY |
1360 | percpu_counter_add(&sbi->s_freeinodes_counter, |
1361 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1362 | ||
01f795f9 YY |
1363 | ext4_debug("free blocks count %llu", |
1364 | percpu_counter_read(&sbi->s_freeclusters_counter)); | |
2e10e2f2 YY |
1365 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, |
1366 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1367 | sbi->s_log_groups_per_flex) { | |
1368 | ext4_group_t flex_group; | |
1369 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
90ba983f TT |
1370 | atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), |
1371 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2e10e2f2 YY |
1372 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, |
1373 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1374 | } | |
1375 | ||
952fc18e TT |
1376 | /* |
1377 | * Update the fs overhead information | |
1378 | */ | |
1379 | ext4_calculate_overhead(sb); | |
1380 | ||
2e10e2f2 YY |
1381 | if (test_opt(sb, DEBUG)) |
1382 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1383 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1384 | blocks_count, free_blocks, reserved_blocks); | |
1385 | } | |
1386 | ||
4bac1f8c YY |
1387 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1388 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1389 | * transaction and not have it write the data to disk. | |
1390 | */ | |
1391 | static int ext4_flex_group_add(struct super_block *sb, | |
1392 | struct inode *resize_inode, | |
1393 | struct ext4_new_flex_group_data *flex_gd) | |
1394 | { | |
1395 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1396 | struct ext4_super_block *es = sbi->s_es; | |
1397 | ext4_fsblk_t o_blocks_count; | |
1398 | ext4_grpblk_t last; | |
1399 | ext4_group_t group; | |
1400 | handle_t *handle; | |
1401 | unsigned reserved_gdb; | |
1402 | int err = 0, err2 = 0, credit; | |
1403 | ||
1404 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1405 | ||
1406 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1407 | o_blocks_count = ext4_blocks_count(es); | |
1408 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1409 | BUG_ON(last); | |
1410 | ||
1411 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1412 | if (err) | |
1413 | goto exit; | |
1414 | /* | |
1415 | * We will always be modifying at least the superblock and GDT | |
1416 | * block. If we are adding a group past the last current GDT block, | |
1417 | * we will also modify the inode and the dindirect block. If we | |
1418 | * are adding a group with superblock/GDT backups we will also | |
1419 | * modify each of the reserved GDT dindirect blocks. | |
1420 | */ | |
1421 | credit = flex_gd->count * 4 + reserved_gdb; | |
9924a92a | 1422 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit); |
4bac1f8c YY |
1423 | if (IS_ERR(handle)) { |
1424 | err = PTR_ERR(handle); | |
1425 | goto exit; | |
1426 | } | |
1427 | ||
1428 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1429 | if (err) | |
1430 | goto exit_journal; | |
1431 | ||
1432 | group = flex_gd->groups[0].group; | |
1433 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); | |
1434 | err = ext4_add_new_descs(handle, sb, group, | |
1435 | resize_inode, flex_gd->count); | |
1436 | if (err) | |
1437 | goto exit_journal; | |
1438 | ||
1439 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1440 | if (err) | |
1441 | goto exit_journal; | |
1442 | ||
1443 | ext4_update_super(sb, flex_gd); | |
1444 | ||
1445 | err = ext4_handle_dirty_super(handle, sb); | |
1446 | ||
1447 | exit_journal: | |
1448 | err2 = ext4_journal_stop(handle); | |
1449 | if (!err) | |
1450 | err = err2; | |
1451 | ||
1452 | if (!err) { | |
2ebd1704 YY |
1453 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1454 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1455 | EXT4_DESC_PER_BLOCK(sb)); | |
01f795f9 YY |
1456 | int meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, |
1457 | EXT4_FEATURE_INCOMPAT_META_BG); | |
0acdb887 | 1458 | sector_t old_gdb = 0; |
2ebd1704 | 1459 | |
4bac1f8c | 1460 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
01f795f9 | 1461 | sizeof(struct ext4_super_block), 0); |
2ebd1704 | 1462 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1463 | struct buffer_head *gdb_bh; |
2ebd1704 | 1464 | |
4bac1f8c | 1465 | gdb_bh = sbi->s_group_desc[gdb_num]; |
0acdb887 TM |
1466 | if (old_gdb == gdb_bh->b_blocknr) |
1467 | continue; | |
4bac1f8c | 1468 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, |
01f795f9 | 1469 | gdb_bh->b_size, meta_bg); |
0acdb887 | 1470 | old_gdb = gdb_bh->b_blocknr; |
4bac1f8c YY |
1471 | } |
1472 | } | |
1473 | exit: | |
1474 | return err; | |
1475 | } | |
1476 | ||
19c5246d YY |
1477 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1478 | struct ext4_new_flex_group_data *flex_gd, | |
1479 | ext4_fsblk_t n_blocks_count, | |
1480 | unsigned long flexbg_size) | |
1481 | { | |
1482 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1483 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1484 | ext4_fsblk_t o_blocks_count; | |
1485 | ext4_group_t n_group; | |
1486 | ext4_group_t group; | |
1487 | ext4_group_t last_group; | |
1488 | ext4_grpblk_t last; | |
1489 | ext4_grpblk_t blocks_per_group; | |
1490 | unsigned long i; | |
1491 | ||
1492 | blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); | |
1493 | ||
1494 | o_blocks_count = ext4_blocks_count(es); | |
1495 | ||
1496 | if (o_blocks_count == n_blocks_count) | |
1497 | return 0; | |
1498 | ||
1499 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1500 | BUG_ON(last); | |
1501 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1502 | ||
1503 | last_group = group | (flexbg_size - 1); | |
1504 | if (last_group > n_group) | |
1505 | last_group = n_group; | |
1506 | ||
1507 | flex_gd->count = last_group - group + 1; | |
1508 | ||
1509 | for (i = 0; i < flex_gd->count; i++) { | |
1510 | int overhead; | |
1511 | ||
1512 | group_data[i].group = group + i; | |
1513 | group_data[i].blocks_count = blocks_per_group; | |
01f795f9 | 1514 | overhead = ext4_group_overhead_blocks(sb, group + i); |
19c5246d | 1515 | group_data[i].free_blocks_count = blocks_per_group - overhead; |
7f511862 | 1516 | if (ext4_has_group_desc_csum(sb)) { |
19c5246d YY |
1517 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1518 | EXT4_BG_INODE_UNINIT; | |
7f511862 TT |
1519 | if (!test_opt(sb, INIT_INODE_TABLE)) |
1520 | flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED; | |
1521 | } else | |
19c5246d YY |
1522 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; |
1523 | } | |
1524 | ||
feb0ab32 | 1525 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1526 | /* We need to initialize block bitmap of last group. */ |
1527 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1528 | ||
1529 | if ((last_group == n_group) && (last != blocks_per_group - 1)) { | |
1530 | group_data[i - 1].blocks_count = last + 1; | |
1531 | group_data[i - 1].free_blocks_count -= blocks_per_group- | |
1532 | last - 1; | |
1533 | } | |
1534 | ||
1535 | return 1; | |
1536 | } | |
1537 | ||
ac27a0ec DK |
1538 | /* Add group descriptor data to an existing or new group descriptor block. |
1539 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1540 | * the filesystem, because we cannot abort the transaction and not have it | |
1541 | * write the data to disk. | |
1542 | * | |
1543 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1544 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1545 | * | |
1546 | * We only need to hold the superblock lock while we are actually adding | |
1547 | * in the new group's counts to the superblock. Prior to that we have | |
1548 | * not really "added" the group at all. We re-check that we are still | |
1549 | * adding in the last group in case things have changed since verifying. | |
1550 | */ | |
617ba13b | 1551 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1552 | { |
61f296cc | 1553 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1554 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1555 | struct ext4_super_block *es = sbi->s_es; | |
1556 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1557 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1558 | struct inode *inode = NULL; |
03b40e34 | 1559 | int gdb_off; |
61f296cc YY |
1560 | int err; |
1561 | __u16 bg_flags = 0; | |
ac27a0ec | 1562 | |
617ba13b | 1563 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); |
ac27a0ec | 1564 | |
617ba13b MC |
1565 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1566 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1567 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1568 | return -EPERM; |
1569 | } | |
1570 | ||
bd81d8ee LV |
1571 | if (ext4_blocks_count(es) + input->blocks_count < |
1572 | ext4_blocks_count(es)) { | |
12062ddd | 1573 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1574 | return -EINVAL; |
1575 | } | |
1576 | ||
617ba13b | 1577 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1578 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1579 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1580 | return -EINVAL; |
1581 | } | |
1582 | ||
1583 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1584 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1585 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1586 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1587 | ext4_warning(sb, |
ac27a0ec DK |
1588 | "No reserved GDT blocks, can't resize"); |
1589 | return -EPERM; | |
1590 | } | |
1d1fe1ee DH |
1591 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1592 | if (IS_ERR(inode)) { | |
12062ddd | 1593 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1594 | return PTR_ERR(inode); |
ac27a0ec DK |
1595 | } |
1596 | } | |
1597 | ||
920313a7 | 1598 | |
61f296cc | 1599 | err = verify_group_input(sb, input); |
08c3a813 | 1600 | if (err) |
61f296cc | 1601 | goto out; |
ac27a0ec | 1602 | |
117fff10 TT |
1603 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1604 | if (err) | |
7f511862 | 1605 | goto out; |
117fff10 | 1606 | |
28623c2f TT |
1607 | err = ext4_mb_alloc_groupinfo(sb, input->group + 1); |
1608 | if (err) | |
1609 | goto out; | |
1610 | ||
61f296cc YY |
1611 | flex_gd.count = 1; |
1612 | flex_gd.groups = input; | |
1613 | flex_gd.bg_flags = &bg_flags; | |
1614 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1615 | out: | |
ac27a0ec DK |
1616 | iput(inode); |
1617 | return err; | |
617ba13b | 1618 | } /* ext4_group_add */ |
ac27a0ec | 1619 | |
18e31438 YY |
1620 | /* |
1621 | * extend a group without checking assuming that checking has been done. | |
1622 | */ | |
1623 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1624 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1625 | { | |
1626 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1627 | handle_t *handle; | |
1628 | int err = 0, err2; | |
1629 | ||
1630 | /* We will update the superblock, one block bitmap, and | |
1631 | * one group descriptor via ext4_group_add_blocks(). | |
1632 | */ | |
9924a92a | 1633 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3); |
18e31438 YY |
1634 | if (IS_ERR(handle)) { |
1635 | err = PTR_ERR(handle); | |
1636 | ext4_warning(sb, "error %d on journal start", err); | |
1637 | return err; | |
1638 | } | |
1639 | ||
1640 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1641 | if (err) { | |
1642 | ext4_warning(sb, "error %d on journal write access", err); | |
1643 | goto errout; | |
1644 | } | |
1645 | ||
1646 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1647 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1648 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1649 | o_blocks_count + add); | |
1650 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1651 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1652 | if (err) | |
1653 | goto errout; | |
1654 | ext4_handle_dirty_super(handle, sb); | |
1655 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1656 | o_blocks_count + add); | |
1657 | errout: | |
1658 | err2 = ext4_journal_stop(handle); | |
1659 | if (err2 && !err) | |
1660 | err = err2; | |
1661 | ||
1662 | if (!err) { | |
1663 | if (test_opt(sb, DEBUG)) | |
1664 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1665 | "blocks\n", ext4_blocks_count(es)); | |
6ca792ed | 1666 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, |
01f795f9 | 1667 | (char *)es, sizeof(struct ext4_super_block), 0); |
18e31438 YY |
1668 | } |
1669 | return err; | |
1670 | } | |
1671 | ||
2b2d6d01 TT |
1672 | /* |
1673 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1674 | * point is only used to extend the current filesystem to the end of the last |
1675 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1676 | * for emergencies (because it has no dependencies on reserved blocks). | |
1677 | * | |
617ba13b | 1678 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1679 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1680 | * GDT blocks are reserved to grow to the desired size. | |
1681 | */ | |
617ba13b MC |
1682 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1683 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1684 | { |
617ba13b | 1685 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1686 | ext4_grpblk_t last; |
1687 | ext4_grpblk_t add; | |
af5bc92d | 1688 | struct buffer_head *bh; |
d89651c8 | 1689 | int err; |
5f21b0e6 | 1690 | ext4_group_t group; |
ac27a0ec | 1691 | |
bd81d8ee | 1692 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1693 | |
1694 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1695 | ext4_msg(sb, KERN_DEBUG, |
1696 | "extending last group from %llu to %llu blocks", | |
1697 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1698 | |
1699 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1700 | return 0; | |
1701 | ||
1702 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1703 | ext4_msg(sb, KERN_ERR, |
1704 | "filesystem too large to resize to %llu blocks safely", | |
1705 | n_blocks_count); | |
ac27a0ec | 1706 | if (sizeof(sector_t) < 8) |
12062ddd | 1707 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1708 | return -EINVAL; |
1709 | } | |
1710 | ||
1711 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1712 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1713 | return -EINVAL; |
ac27a0ec DK |
1714 | } |
1715 | ||
1716 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1717 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1718 | |
1719 | if (last == 0) { | |
12062ddd | 1720 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1721 | return -EPERM; |
1722 | } | |
1723 | ||
617ba13b | 1724 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1725 | |
1726 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1727 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1728 | return -EINVAL; |
1729 | } | |
1730 | ||
1731 | if (o_blocks_count + add > n_blocks_count) | |
1732 | add = n_blocks_count - o_blocks_count; | |
1733 | ||
1734 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1735 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1736 | o_blocks_count + add, add); |
1737 | ||
1738 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1739 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1740 | if (!bh) { |
12062ddd | 1741 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1742 | return -ENOSPC; |
1743 | } | |
1744 | brelse(bh); | |
1745 | ||
d89651c8 | 1746 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1747 | return err; |
617ba13b | 1748 | } /* ext4_group_extend */ |
19c5246d | 1749 | |
1c6bd717 TT |
1750 | |
1751 | static int num_desc_blocks(struct super_block *sb, ext4_group_t groups) | |
1752 | { | |
1753 | return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); | |
1754 | } | |
1755 | ||
1756 | /* | |
1757 | * Release the resize inode and drop the resize_inode feature if there | |
1758 | * are no more reserved gdt blocks, and then convert the file system | |
1759 | * to enable meta_bg | |
1760 | */ | |
1761 | static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode) | |
1762 | { | |
1763 | handle_t *handle; | |
1764 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1765 | struct ext4_super_block *es = sbi->s_es; | |
59e31c15 | 1766 | struct ext4_inode_info *ei = EXT4_I(inode); |
1c6bd717 TT |
1767 | ext4_fsblk_t nr; |
1768 | int i, ret, err = 0; | |
1769 | int credits = 1; | |
1770 | ||
1771 | ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg"); | |
59e31c15 | 1772 | if (inode) { |
1c6bd717 TT |
1773 | if (es->s_reserved_gdt_blocks) { |
1774 | ext4_error(sb, "Unexpected non-zero " | |
1775 | "s_reserved_gdt_blocks"); | |
1776 | return -EPERM; | |
1777 | } | |
1c6bd717 TT |
1778 | |
1779 | /* Do a quick sanity check of the resize inode */ | |
1780 | if (inode->i_blocks != 1 << (inode->i_blkbits - 9)) | |
1781 | goto invalid_resize_inode; | |
1782 | for (i = 0; i < EXT4_N_BLOCKS; i++) { | |
1783 | if (i == EXT4_DIND_BLOCK) { | |
1784 | if (ei->i_data[i]) | |
1785 | continue; | |
1786 | else | |
1787 | goto invalid_resize_inode; | |
1788 | } | |
1789 | if (ei->i_data[i]) | |
1790 | goto invalid_resize_inode; | |
1791 | } | |
1792 | credits += 3; /* block bitmap, bg descriptor, resize inode */ | |
1793 | } | |
1794 | ||
9924a92a | 1795 | handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits); |
1c6bd717 TT |
1796 | if (IS_ERR(handle)) |
1797 | return PTR_ERR(handle); | |
1798 | ||
1799 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1800 | if (err) | |
1801 | goto errout; | |
1802 | ||
1803 | EXT4_CLEAR_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE); | |
1804 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); | |
1805 | sbi->s_es->s_first_meta_bg = | |
1806 | cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count)); | |
1807 | ||
1808 | err = ext4_handle_dirty_super(handle, sb); | |
1809 | if (err) { | |
1810 | ext4_std_error(sb, err); | |
1811 | goto errout; | |
1812 | } | |
1813 | ||
1814 | if (inode) { | |
1815 | nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]); | |
1816 | ext4_free_blocks(handle, inode, NULL, nr, 1, | |
1817 | EXT4_FREE_BLOCKS_METADATA | | |
1818 | EXT4_FREE_BLOCKS_FORGET); | |
1819 | ei->i_data[EXT4_DIND_BLOCK] = 0; | |
1820 | inode->i_blocks = 0; | |
1821 | ||
1822 | err = ext4_mark_inode_dirty(handle, inode); | |
1823 | if (err) | |
1824 | ext4_std_error(sb, err); | |
1825 | } | |
1826 | ||
1827 | errout: | |
1828 | ret = ext4_journal_stop(handle); | |
1829 | if (!err) | |
1830 | err = ret; | |
1831 | return ret; | |
1832 | ||
1833 | invalid_resize_inode: | |
1834 | ext4_error(sb, "corrupted/inconsistent resize inode"); | |
1835 | return -EINVAL; | |
1836 | } | |
1837 | ||
19c5246d YY |
1838 | /* |
1839 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1840 | * | |
1841 | * @sb: super block of the fs to be resized | |
1842 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1843 | */ | |
1844 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1845 | { | |
1846 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1847 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1848 | struct ext4_super_block *es = sbi->s_es; | |
1849 | struct buffer_head *bh; | |
01f795f9 YY |
1850 | struct inode *resize_inode = NULL; |
1851 | ext4_grpblk_t add, offset; | |
19c5246d YY |
1852 | unsigned long n_desc_blocks; |
1853 | unsigned long o_desc_blocks; | |
01f795f9 YY |
1854 | ext4_group_t o_group; |
1855 | ext4_group_t n_group; | |
1856 | ext4_fsblk_t o_blocks_count; | |
1c6bd717 | 1857 | ext4_fsblk_t n_blocks_count_retry = 0; |
4da4a56e | 1858 | unsigned long last_update_time = 0; |
117fff10 | 1859 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
01f795f9 | 1860 | int meta_bg; |
19c5246d | 1861 | |
59e31c15 TT |
1862 | /* See if the device is actually as big as what was requested */ |
1863 | bh = sb_bread(sb, n_blocks_count - 1); | |
1864 | if (!bh) { | |
1865 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1866 | return -ENOSPC; | |
1867 | } | |
1868 | brelse(bh); | |
1869 | ||
1c6bd717 | 1870 | retry: |
19c5246d YY |
1871 | o_blocks_count = ext4_blocks_count(es); |
1872 | ||
59e31c15 TT |
1873 | ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu " |
1874 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1875 | |
1876 | if (n_blocks_count < o_blocks_count) { | |
1877 | /* On-line shrinking not supported */ | |
1878 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1879 | return -EINVAL; | |
1880 | } | |
1881 | ||
1882 | if (n_blocks_count == o_blocks_count) | |
1883 | /* Nothing need to do */ | |
1884 | return 0; | |
1885 | ||
bd86298e | 1886 | n_group = ext4_get_group_number(sb, n_blocks_count - 1); |
3f8a6411 TT |
1887 | if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) { |
1888 | ext4_warning(sb, "resize would cause inodes_count overflow"); | |
1889 | return -EINVAL; | |
1890 | } | |
a0ade1de | 1891 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d | 1892 | |
1c6bd717 TT |
1893 | n_desc_blocks = num_desc_blocks(sb, n_group + 1); |
1894 | o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count); | |
19c5246d | 1895 | |
01f795f9 | 1896 | meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG); |
19c5246d | 1897 | |
01f795f9 YY |
1898 | if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE)) { |
1899 | if (meta_bg) { | |
1900 | ext4_error(sb, "resize_inode and meta_bg enabled " | |
1901 | "simultaneously"); | |
1902 | return -EINVAL; | |
1903 | } | |
1c6bd717 TT |
1904 | if (n_desc_blocks > o_desc_blocks + |
1905 | le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
1906 | n_blocks_count_retry = n_blocks_count; | |
1907 | n_desc_blocks = o_desc_blocks + | |
1908 | le16_to_cpu(es->s_reserved_gdt_blocks); | |
1909 | n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb); | |
1910 | n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb); | |
1911 | n_group--; /* set to last group number */ | |
01f795f9 | 1912 | } |
1c6bd717 TT |
1913 | |
1914 | if (!resize_inode) | |
1915 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
01f795f9 YY |
1916 | if (IS_ERR(resize_inode)) { |
1917 | ext4_warning(sb, "Error opening resize inode"); | |
1918 | return PTR_ERR(resize_inode); | |
1919 | } | |
1c6bd717 TT |
1920 | } |
1921 | ||
59e31c15 | 1922 | if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) { |
1c6bd717 TT |
1923 | err = ext4_convert_meta_bg(sb, resize_inode); |
1924 | if (err) | |
1925 | goto out; | |
1926 | if (resize_inode) { | |
1927 | iput(resize_inode); | |
1928 | resize_inode = NULL; | |
1929 | } | |
1930 | if (n_blocks_count_retry) { | |
1931 | n_blocks_count = n_blocks_count_retry; | |
1932 | n_blocks_count_retry = 0; | |
1933 | goto retry; | |
1934 | } | |
19c5246d YY |
1935 | } |
1936 | ||
a0ade1de LC |
1937 | /* extend the last group */ |
1938 | if (n_group == o_group) | |
1939 | add = n_blocks_count - o_blocks_count; | |
1940 | else | |
1941 | add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); | |
1942 | if (add > 0) { | |
19c5246d YY |
1943 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1944 | if (err) | |
1945 | goto out; | |
1946 | } | |
1947 | ||
d7574ad0 | 1948 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
1949 | goto out; |
1950 | ||
117fff10 TT |
1951 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
1952 | if (err) | |
1953 | return err; | |
1954 | ||
28623c2f TT |
1955 | err = ext4_mb_alloc_groupinfo(sb, n_group + 1); |
1956 | if (err) | |
1957 | goto out; | |
1958 | ||
19c5246d YY |
1959 | flex_gd = alloc_flex_gd(flexbg_size); |
1960 | if (flex_gd == NULL) { | |
1961 | err = -ENOMEM; | |
1962 | goto out; | |
1963 | } | |
1964 | ||
1965 | /* Add flex groups. Note that a regular group is a | |
1966 | * flex group with 1 group. | |
1967 | */ | |
1968 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
1969 | flexbg_size)) { | |
4da4a56e TT |
1970 | if (jiffies - last_update_time > HZ * 10) { |
1971 | if (last_update_time) | |
1972 | ext4_msg(sb, KERN_INFO, | |
1973 | "resized to %llu blocks", | |
1974 | ext4_blocks_count(es)); | |
1975 | last_update_time = jiffies; | |
1976 | } | |
03c1c290 YY |
1977 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
1978 | break; | |
19c5246d YY |
1979 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
1980 | if (unlikely(err)) | |
1981 | break; | |
1982 | } | |
1983 | ||
1c6bd717 TT |
1984 | if (!err && n_blocks_count_retry) { |
1985 | n_blocks_count = n_blocks_count_retry; | |
1986 | n_blocks_count_retry = 0; | |
1987 | free_flex_gd(flex_gd); | |
1988 | flex_gd = NULL; | |
1989 | goto retry; | |
1990 | } | |
1991 | ||
19c5246d YY |
1992 | out: |
1993 | if (flex_gd) | |
1994 | free_flex_gd(flex_gd); | |
01f795f9 YY |
1995 | if (resize_inode != NULL) |
1996 | iput(resize_inode); | |
59e31c15 | 1997 | ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count); |
19c5246d YY |
1998 | return err; |
1999 | } |