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 | ||
ac27a0ec DK |
48 | #define outside(b, first, last) ((b) < (first) || (b) >= (last)) |
49 | #define inside(b, first, last) ((b) >= (first) && (b) < (last)) | |
50 | ||
51 | static int verify_group_input(struct super_block *sb, | |
617ba13b | 52 | struct ext4_new_group_data *input) |
ac27a0ec | 53 | { |
617ba13b MC |
54 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
55 | struct ext4_super_block *es = sbi->s_es; | |
bd81d8ee | 56 | ext4_fsblk_t start = ext4_blocks_count(es); |
617ba13b | 57 | ext4_fsblk_t end = start + input->blocks_count; |
fd2d4291 | 58 | ext4_group_t group = input->group; |
617ba13b MC |
59 | ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group; |
60 | unsigned overhead = ext4_bg_has_super(sb, group) ? | |
61 | (1 + ext4_bg_num_gdb(sb, group) + | |
ac27a0ec | 62 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; |
617ba13b | 63 | ext4_fsblk_t metaend = start + overhead; |
ac27a0ec | 64 | struct buffer_head *bh = NULL; |
3a5b2ecd | 65 | ext4_grpblk_t free_blocks_count, offset; |
ac27a0ec DK |
66 | int err = -EINVAL; |
67 | ||
68 | input->free_blocks_count = free_blocks_count = | |
69 | input->blocks_count - 2 - overhead - sbi->s_itb_per_group; | |
70 | ||
71 | if (test_opt(sb, DEBUG)) | |
617ba13b | 72 | printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks " |
ac27a0ec | 73 | "(%d free, %u reserved)\n", |
617ba13b | 74 | ext4_bg_has_super(sb, input->group) ? "normal" : |
ac27a0ec DK |
75 | "no-super", input->group, input->blocks_count, |
76 | free_blocks_count, input->reserved_blocks); | |
77 | ||
3a5b2ecd | 78 | ext4_get_group_no_and_offset(sb, start, NULL, &offset); |
ac27a0ec | 79 | if (group != sbi->s_groups_count) |
12062ddd | 80 | ext4_warning(sb, "Cannot add at group %u (only %u groups)", |
ac27a0ec | 81 | input->group, sbi->s_groups_count); |
3a5b2ecd | 82 | else if (offset != 0) |
12062ddd | 83 | ext4_warning(sb, "Last group not full"); |
ac27a0ec | 84 | else if (input->reserved_blocks > input->blocks_count / 5) |
12062ddd | 85 | ext4_warning(sb, "Reserved blocks too high (%u)", |
ac27a0ec DK |
86 | input->reserved_blocks); |
87 | else if (free_blocks_count < 0) | |
12062ddd | 88 | ext4_warning(sb, "Bad blocks count %u", |
ac27a0ec DK |
89 | input->blocks_count); |
90 | else if (!(bh = sb_bread(sb, end - 1))) | |
12062ddd | 91 | ext4_warning(sb, "Cannot read last block (%llu)", |
ac27a0ec DK |
92 | end - 1); |
93 | else if (outside(input->block_bitmap, start, end)) | |
12062ddd | 94 | ext4_warning(sb, "Block bitmap not in group (block %llu)", |
1939e49a | 95 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 96 | else if (outside(input->inode_bitmap, start, end)) |
12062ddd | 97 | ext4_warning(sb, "Inode bitmap not in group (block %llu)", |
1939e49a | 98 | (unsigned long long)input->inode_bitmap); |
ac27a0ec | 99 | else if (outside(input->inode_table, start, end) || |
2b2d6d01 | 100 | outside(itend - 1, start, end)) |
12062ddd | 101 | ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)", |
1939e49a | 102 | (unsigned long long)input->inode_table, itend - 1); |
ac27a0ec | 103 | else if (input->inode_bitmap == input->block_bitmap) |
12062ddd | 104 | ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)", |
1939e49a | 105 | (unsigned long long)input->block_bitmap); |
ac27a0ec | 106 | else if (inside(input->block_bitmap, input->inode_table, itend)) |
12062ddd ES |
107 | ext4_warning(sb, "Block bitmap (%llu) in inode table " |
108 | "(%llu-%llu)", | |
1939e49a RD |
109 | (unsigned long long)input->block_bitmap, |
110 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 111 | else if (inside(input->inode_bitmap, input->inode_table, itend)) |
12062ddd ES |
112 | ext4_warning(sb, "Inode bitmap (%llu) in inode table " |
113 | "(%llu-%llu)", | |
1939e49a RD |
114 | (unsigned long long)input->inode_bitmap, |
115 | (unsigned long long)input->inode_table, itend - 1); | |
ac27a0ec | 116 | else if (inside(input->block_bitmap, start, metaend)) |
12062ddd | 117 | ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
118 | (unsigned long long)input->block_bitmap, |
119 | start, metaend - 1); | |
ac27a0ec | 120 | else if (inside(input->inode_bitmap, start, metaend)) |
12062ddd | 121 | ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)", |
1939e49a RD |
122 | (unsigned long long)input->inode_bitmap, |
123 | start, metaend - 1); | |
ac27a0ec | 124 | else if (inside(input->inode_table, start, metaend) || |
2b2d6d01 | 125 | inside(itend - 1, start, metaend)) |
12062ddd ES |
126 | ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table " |
127 | "(%llu-%llu)", | |
1939e49a RD |
128 | (unsigned long long)input->inode_table, |
129 | itend - 1, start, metaend - 1); | |
ac27a0ec DK |
130 | else |
131 | err = 0; | |
132 | brelse(bh); | |
133 | ||
134 | return err; | |
135 | } | |
136 | ||
28c7bac0 YY |
137 | /* |
138 | * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex | |
139 | * group each time. | |
140 | */ | |
141 | struct ext4_new_flex_group_data { | |
142 | struct ext4_new_group_data *groups; /* new_group_data for groups | |
143 | in the flex group */ | |
144 | __u16 *bg_flags; /* block group flags of groups | |
145 | in @groups */ | |
146 | ext4_group_t count; /* number of groups in @groups | |
147 | */ | |
148 | }; | |
149 | ||
150 | /* | |
151 | * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of | |
152 | * @flexbg_size. | |
153 | * | |
154 | * Returns NULL on failure otherwise address of the allocated structure. | |
155 | */ | |
156 | static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size) | |
157 | { | |
158 | struct ext4_new_flex_group_data *flex_gd; | |
159 | ||
160 | flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS); | |
161 | if (flex_gd == NULL) | |
162 | goto out3; | |
163 | ||
967ac8af HC |
164 | if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data)) |
165 | goto out2; | |
28c7bac0 YY |
166 | flex_gd->count = flexbg_size; |
167 | ||
168 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
169 | flexbg_size, GFP_NOFS); | |
170 | if (flex_gd->groups == NULL) | |
171 | goto out2; | |
172 | ||
173 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
174 | if (flex_gd->bg_flags == NULL) | |
175 | goto out1; | |
176 | ||
177 | return flex_gd; | |
178 | ||
179 | out1: | |
180 | kfree(flex_gd->groups); | |
181 | out2: | |
182 | kfree(flex_gd); | |
183 | out3: | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
188 | { | |
189 | kfree(flex_gd->bg_flags); | |
190 | kfree(flex_gd->groups); | |
191 | kfree(flex_gd); | |
192 | } | |
193 | ||
3fbea4b3 YY |
194 | /* |
195 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
196 | * and inode tables for a flex group. | |
197 | * | |
198 | * This function is used by 64bit-resize. Note that this function allocates | |
199 | * group tables from the 1st group of groups contained by @flexgd, which may | |
200 | * be a partial of a flex group. | |
201 | * | |
202 | * @sb: super block of fs to which the groups belongs | |
03c1c290 YY |
203 | * |
204 | * Returns 0 on a successful allocation of the metadata blocks in the | |
205 | * block group. | |
3fbea4b3 | 206 | */ |
03c1c290 | 207 | static int ext4_alloc_group_tables(struct super_block *sb, |
3fbea4b3 YY |
208 | struct ext4_new_flex_group_data *flex_gd, |
209 | int flexbg_size) | |
210 | { | |
211 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
212 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
213 | ext4_fsblk_t start_blk; | |
214 | ext4_fsblk_t last_blk; | |
215 | ext4_group_t src_group; | |
216 | ext4_group_t bb_index = 0; | |
217 | ext4_group_t ib_index = 0; | |
218 | ext4_group_t it_index = 0; | |
219 | ext4_group_t group; | |
220 | ext4_group_t last_group; | |
221 | unsigned overhead; | |
222 | ||
223 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
224 | ||
225 | src_group = group_data[0].group; | |
226 | last_group = src_group + flex_gd->count - 1; | |
227 | ||
228 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
229 | (last_group & ~(flexbg_size - 1)))); | |
230 | next_group: | |
231 | group = group_data[0].group; | |
03c1c290 YY |
232 | if (src_group >= group_data[0].group + flex_gd->count) |
233 | return -ENOSPC; | |
3fbea4b3 YY |
234 | start_blk = ext4_group_first_block_no(sb, src_group); |
235 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
236 | ||
237 | overhead = ext4_bg_has_super(sb, src_group) ? | |
238 | (1 + ext4_bg_num_gdb(sb, src_group) + | |
239 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
240 | ||
241 | start_blk += overhead; | |
242 | ||
3fbea4b3 YY |
243 | /* We collect contiguous blocks as much as possible. */ |
244 | src_group++; | |
245 | for (; src_group <= last_group; src_group++) | |
246 | if (!ext4_bg_has_super(sb, src_group)) | |
247 | last_blk += group_data[src_group - group].blocks_count; | |
248 | else | |
249 | break; | |
250 | ||
251 | /* Allocate block bitmaps */ | |
252 | for (; bb_index < flex_gd->count; bb_index++) { | |
253 | if (start_blk >= last_blk) | |
254 | goto next_group; | |
255 | group_data[bb_index].block_bitmap = start_blk++; | |
256 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
257 | group -= group_data[0].group; | |
258 | group_data[group].free_blocks_count--; | |
259 | if (flexbg_size > 1) | |
260 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
261 | } | |
262 | ||
263 | /* Allocate inode bitmaps */ | |
264 | for (; ib_index < flex_gd->count; ib_index++) { | |
265 | if (start_blk >= last_blk) | |
266 | goto next_group; | |
267 | group_data[ib_index].inode_bitmap = start_blk++; | |
268 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
269 | group -= group_data[0].group; | |
270 | group_data[group].free_blocks_count--; | |
271 | if (flexbg_size > 1) | |
272 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
273 | } | |
274 | ||
275 | /* Allocate inode tables */ | |
276 | for (; it_index < flex_gd->count; it_index++) { | |
277 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) | |
278 | goto next_group; | |
279 | group_data[it_index].inode_table = start_blk; | |
280 | ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); | |
281 | group -= group_data[0].group; | |
282 | group_data[group].free_blocks_count -= | |
283 | EXT4_SB(sb)->s_itb_per_group; | |
284 | if (flexbg_size > 1) | |
285 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
286 | ||
287 | start_blk += EXT4_SB(sb)->s_itb_per_group; | |
288 | } | |
289 | ||
290 | if (test_opt(sb, DEBUG)) { | |
291 | int i; | |
292 | group = group_data[0].group; | |
293 | ||
294 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
295 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
296 | flexbg_size); | |
297 | ||
298 | for (i = 0; i < flex_gd->count; i++) { | |
299 | printk(KERN_DEBUG "adding %s group %u: %u " | |
300 | "blocks (%d free)\n", | |
301 | ext4_bg_has_super(sb, group + i) ? "normal" : | |
302 | "no-super", group + i, | |
303 | group_data[i].blocks_count, | |
304 | group_data[i].free_blocks_count); | |
305 | } | |
306 | } | |
03c1c290 | 307 | return 0; |
3fbea4b3 YY |
308 | } |
309 | ||
ac27a0ec | 310 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 311 | ext4_fsblk_t blk) |
ac27a0ec DK |
312 | { |
313 | struct buffer_head *bh; | |
314 | int err; | |
315 | ||
316 | bh = sb_getblk(sb, blk); | |
317 | if (!bh) | |
318 | return ERR_PTR(-EIO); | |
617ba13b | 319 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
320 | brelse(bh); |
321 | bh = ERR_PTR(err); | |
322 | } else { | |
ac27a0ec DK |
323 | memset(bh->b_data, 0, sb->s_blocksize); |
324 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
325 | } |
326 | ||
327 | return bh; | |
328 | } | |
329 | ||
14904107 ES |
330 | /* |
331 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
332 | * If that fails, restart the transaction & regain write access for the | |
333 | * buffer head which is used for block_bitmap modifications. | |
334 | */ | |
6d40bc5a | 335 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
336 | { |
337 | int err; | |
338 | ||
0390131b | 339 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
340 | return 0; |
341 | ||
342 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
343 | if (err < 0) | |
344 | return err; | |
345 | if (err) { | |
6d40bc5a YY |
346 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
347 | if (err) | |
14904107 | 348 | return err; |
2b2d6d01 | 349 | } |
14904107 ES |
350 | |
351 | return 0; | |
352 | } | |
353 | ||
33afdcc5 YY |
354 | /* |
355 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
356 | * | |
357 | * Helper function for ext4_setup_new_group_blocks() which set . | |
358 | * | |
359 | * @sb: super block | |
360 | * @handle: journal handle | |
361 | * @flex_gd: flex group data | |
362 | */ | |
363 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
364 | struct ext4_new_flex_group_data *flex_gd, | |
365 | ext4_fsblk_t block, ext4_group_t count) | |
366 | { | |
367 | ext4_group_t count2; | |
368 | ||
369 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
370 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
371 | ext4_fsblk_t start; | |
372 | struct buffer_head *bh; | |
373 | ext4_group_t group; | |
374 | int err; | |
375 | ||
376 | ext4_get_group_no_and_offset(sb, block, &group, NULL); | |
377 | start = ext4_group_first_block_no(sb, group); | |
378 | group -= flex_gd->groups[0].group; | |
379 | ||
380 | count2 = sb->s_blocksize * 8 - (block - start); | |
381 | if (count2 > count) | |
382 | count2 = count; | |
383 | ||
384 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
385 | BUG_ON(flex_gd->count > 1); | |
386 | continue; | |
387 | } | |
388 | ||
389 | err = extend_or_restart_transaction(handle, 1); | |
390 | if (err) | |
391 | return err; | |
392 | ||
393 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
394 | if (!bh) | |
395 | return -EIO; | |
396 | ||
397 | err = ext4_journal_get_write_access(handle, bh); | |
398 | if (err) | |
399 | return err; | |
400 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
401 | block - start, count2); | |
402 | ext4_set_bits(bh->b_data, block - start, count2); | |
403 | ||
404 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
405 | if (unlikely(err)) | |
406 | return err; | |
407 | brelse(bh); | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | /* | |
414 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
415 | * This doesn't need to be part of the main transaction, since we are only | |
416 | * changing blocks outside the actual filesystem. We still do journaling to | |
417 | * ensure the recovery is correct in case of a failure just after resize. | |
418 | * If any part of this fails, we simply abort the resize. | |
419 | * | |
420 | * setup_new_flex_group_blocks handles a flex group as follow: | |
421 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
422 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
423 | * super block and GDT. | |
424 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
425 | * bitmap for blocks taken by group tables. | |
426 | */ | |
427 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
428 | struct ext4_new_flex_group_data *flex_gd) | |
429 | { | |
430 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
431 | ext4_fsblk_t start; | |
432 | ext4_fsblk_t block; | |
433 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
434 | struct ext4_super_block *es = sbi->s_es; | |
435 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
436 | __u16 *bg_flags = flex_gd->bg_flags; | |
437 | handle_t *handle; | |
438 | ext4_group_t group, count; | |
439 | struct buffer_head *bh = NULL; | |
440 | int reserved_gdb, i, j, err = 0, err2; | |
441 | ||
442 | BUG_ON(!flex_gd->count || !group_data || | |
443 | group_data[0].group != sbi->s_groups_count); | |
444 | ||
445 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
446 | ||
447 | /* This transaction may be extended/restarted along the way */ | |
448 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
449 | if (IS_ERR(handle)) | |
450 | return PTR_ERR(handle); | |
451 | ||
452 | group = group_data[0].group; | |
453 | for (i = 0; i < flex_gd->count; i++, group++) { | |
454 | unsigned long gdblocks; | |
455 | ||
456 | gdblocks = ext4_bg_num_gdb(sb, group); | |
457 | start = ext4_group_first_block_no(sb, group); | |
458 | ||
6df935ad YY |
459 | if (!ext4_bg_has_super(sb, group)) |
460 | goto handle_itb; | |
461 | ||
33afdcc5 YY |
462 | /* Copy all of the GDT blocks into the backup in this group */ |
463 | for (j = 0, block = start + 1; j < gdblocks; j++, block++) { | |
464 | struct buffer_head *gdb; | |
465 | ||
466 | ext4_debug("update backup group %#04llx\n", block); | |
467 | err = extend_or_restart_transaction(handle, 1); | |
468 | if (err) | |
469 | goto out; | |
470 | ||
471 | gdb = sb_getblk(sb, block); | |
472 | if (!gdb) { | |
473 | err = -EIO; | |
474 | goto out; | |
475 | } | |
476 | ||
477 | err = ext4_journal_get_write_access(handle, gdb); | |
478 | if (err) { | |
479 | brelse(gdb); | |
480 | goto out; | |
481 | } | |
482 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
483 | gdb->b_size); | |
484 | set_buffer_uptodate(gdb); | |
485 | ||
486 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
487 | if (unlikely(err)) { | |
488 | brelse(gdb); | |
489 | goto out; | |
490 | } | |
491 | brelse(gdb); | |
492 | } | |
493 | ||
494 | /* Zero out all of the reserved backup group descriptor | |
495 | * table blocks | |
496 | */ | |
497 | if (ext4_bg_has_super(sb, group)) { | |
498 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
499 | reserved_gdb, GFP_NOFS); | |
500 | if (err) | |
501 | goto out; | |
502 | } | |
503 | ||
6df935ad | 504 | handle_itb: |
33afdcc5 YY |
505 | /* Initialize group tables of the grop @group */ |
506 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
507 | goto handle_bb; | |
508 | ||
509 | /* Zero out all of the inode table blocks */ | |
510 | block = group_data[i].inode_table; | |
511 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
512 | block, sbi->s_itb_per_group); | |
513 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
514 | GFP_NOFS); | |
515 | if (err) | |
516 | goto out; | |
517 | ||
518 | handle_bb: | |
519 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
520 | goto handle_ib; | |
521 | ||
522 | /* Initialize block bitmap of the @group */ | |
523 | block = group_data[i].block_bitmap; | |
524 | err = extend_or_restart_transaction(handle, 1); | |
525 | if (err) | |
526 | goto out; | |
527 | ||
528 | bh = bclean(handle, sb, block); | |
529 | if (IS_ERR(bh)) { | |
530 | err = PTR_ERR(bh); | |
531 | goto out; | |
532 | } | |
533 | if (ext4_bg_has_super(sb, group)) { | |
534 | ext4_debug("mark backup superblock %#04llx (+0)\n", | |
535 | start); | |
536 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + | |
537 | 1); | |
538 | } | |
539 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
540 | sb->s_blocksize * 8, bh->b_data); | |
541 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
542 | if (err) | |
543 | goto out; | |
544 | brelse(bh); | |
545 | ||
546 | handle_ib: | |
547 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
548 | continue; | |
549 | ||
550 | /* Initialize inode bitmap of the @group */ | |
551 | block = group_data[i].inode_bitmap; | |
552 | err = extend_or_restart_transaction(handle, 1); | |
553 | if (err) | |
554 | goto out; | |
555 | /* Mark unused entries in inode bitmap used */ | |
556 | bh = bclean(handle, sb, block); | |
557 | if (IS_ERR(bh)) { | |
558 | err = PTR_ERR(bh); | |
559 | goto out; | |
560 | } | |
561 | ||
562 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
563 | sb->s_blocksize * 8, bh->b_data); | |
564 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
565 | if (err) | |
566 | goto out; | |
567 | brelse(bh); | |
568 | } | |
569 | bh = NULL; | |
570 | ||
571 | /* Mark group tables in block bitmap */ | |
572 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
573 | count = group_table_count[j]; | |
574 | start = (&group_data[0].block_bitmap)[j]; | |
575 | block = start; | |
576 | for (i = 1; i < flex_gd->count; i++) { | |
577 | block += group_table_count[j]; | |
578 | if (block == (&group_data[i].block_bitmap)[j]) { | |
579 | count += group_table_count[j]; | |
580 | continue; | |
581 | } | |
582 | err = set_flexbg_block_bitmap(sb, handle, | |
583 | flex_gd, start, count); | |
584 | if (err) | |
585 | goto out; | |
586 | count = group_table_count[j]; | |
587 | start = group_data[i].block_bitmap; | |
588 | block = start; | |
589 | } | |
590 | ||
591 | if (count) { | |
592 | err = set_flexbg_block_bitmap(sb, handle, | |
593 | flex_gd, start, count); | |
594 | if (err) | |
595 | goto out; | |
596 | } | |
597 | } | |
598 | ||
599 | out: | |
600 | brelse(bh); | |
601 | err2 = ext4_journal_stop(handle); | |
602 | if (err2 && !err) | |
603 | err = err2; | |
604 | ||
605 | return err; | |
606 | } | |
607 | ||
ac27a0ec DK |
608 | /* |
609 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 610 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
611 | * calling this for the first time. In a sparse filesystem it will be the |
612 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
613 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
614 | */ | |
617ba13b | 615 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
616 | unsigned *five, unsigned *seven) |
617 | { | |
618 | unsigned *min = three; | |
619 | int mult = 3; | |
620 | unsigned ret; | |
621 | ||
617ba13b MC |
622 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
623 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
624 | ret = *min; |
625 | *min += 1; | |
626 | return ret; | |
627 | } | |
628 | ||
629 | if (*five < *min) { | |
630 | min = five; | |
631 | mult = 5; | |
632 | } | |
633 | if (*seven < *min) { | |
634 | min = seven; | |
635 | mult = 7; | |
636 | } | |
637 | ||
638 | ret = *min; | |
639 | *min *= mult; | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
646 | * It is assumed that they are stored in group order. Returns the number of | |
647 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
648 | */ | |
649 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 650 | ext4_group_t end, |
ac27a0ec DK |
651 | struct buffer_head *primary) |
652 | { | |
617ba13b | 653 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
654 | unsigned three = 1; |
655 | unsigned five = 5; | |
656 | unsigned seven = 7; | |
657 | unsigned grp; | |
658 | __le32 *p = (__le32 *)primary->b_data; | |
659 | int gdbackups = 0; | |
660 | ||
617ba13b | 661 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
662 | if (le32_to_cpu(*p++) != |
663 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 664 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 665 | " missing grp %d (%llu)", |
ac27a0ec | 666 | blk, grp, |
bd81d8ee LV |
667 | grp * |
668 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
669 | blk); | |
ac27a0ec DK |
670 | return -EINVAL; |
671 | } | |
617ba13b | 672 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
673 | return -EFBIG; |
674 | } | |
675 | ||
676 | return gdbackups; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Called when we need to bring a reserved group descriptor table block into | |
681 | * use from the resize inode. The primary copy of the new GDT block currently | |
682 | * is an indirect block (under the double indirect block in the resize inode). | |
683 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
684 | * block, in group order. Even though we know all the block numbers we need, | |
685 | * we check to ensure that the resize inode has actually reserved these blocks. | |
686 | * | |
687 | * Don't need to update the block bitmaps because the blocks are still in use. | |
688 | * | |
689 | * We get all of the error cases out of the way, so that we are sure to not | |
690 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
691 | */ | |
692 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 693 | ext4_group_t group) |
ac27a0ec DK |
694 | { |
695 | struct super_block *sb = inode->i_sb; | |
617ba13b | 696 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 697 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 698 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
699 | struct buffer_head **o_group_desc, **n_group_desc; |
700 | struct buffer_head *dind; | |
2f919710 | 701 | struct buffer_head *gdb_bh; |
ac27a0ec | 702 | int gdbackups; |
617ba13b | 703 | struct ext4_iloc iloc; |
ac27a0ec DK |
704 | __le32 *data; |
705 | int err; | |
706 | ||
707 | if (test_opt(sb, DEBUG)) | |
708 | printk(KERN_DEBUG | |
617ba13b | 709 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
710 | gdb_num); |
711 | ||
af5bc92d TT |
712 | /* |
713 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
714 | * because the user tools have no way of handling this. Probably a |
715 | * bad time to do it anyways. | |
716 | */ | |
617ba13b MC |
717 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
718 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 719 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 720 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
721 | return -EPERM; |
722 | } | |
723 | ||
2f919710 YY |
724 | gdb_bh = sb_bread(sb, gdblock); |
725 | if (!gdb_bh) | |
ac27a0ec DK |
726 | return -EIO; |
727 | ||
c72df9f9 | 728 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 729 | if (gdbackups < 0) { |
ac27a0ec DK |
730 | err = gdbackups; |
731 | goto exit_bh; | |
732 | } | |
733 | ||
617ba13b | 734 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
735 | dind = sb_bread(sb, le32_to_cpu(*data)); |
736 | if (!dind) { | |
737 | err = -EIO; | |
738 | goto exit_bh; | |
739 | } | |
740 | ||
741 | data = (__le32 *)dind->b_data; | |
617ba13b | 742 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 743 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 744 | group, gdblock); |
ac27a0ec DK |
745 | err = -EINVAL; |
746 | goto exit_dind; | |
747 | } | |
748 | ||
b4097142 TT |
749 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
750 | if (unlikely(err)) | |
ac27a0ec DK |
751 | goto exit_dind; |
752 | ||
2f919710 | 753 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 754 | if (unlikely(err)) |
ac27a0ec DK |
755 | goto exit_sbh; |
756 | ||
b4097142 TT |
757 | err = ext4_journal_get_write_access(handle, dind); |
758 | if (unlikely(err)) | |
759 | ext4_std_error(sb, err); | |
ac27a0ec | 760 | |
617ba13b | 761 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
762 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
763 | if (unlikely(err)) | |
ac27a0ec DK |
764 | goto exit_dindj; |
765 | ||
f18a5f21 TT |
766 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
767 | sizeof(struct buffer_head *), | |
768 | GFP_NOFS); | |
ac27a0ec DK |
769 | if (!n_group_desc) { |
770 | err = -ENOMEM; | |
f18a5f21 TT |
771 | ext4_warning(sb, "not enough memory for %lu groups", |
772 | gdb_num + 1); | |
ac27a0ec DK |
773 | goto exit_inode; |
774 | } | |
775 | ||
776 | /* | |
777 | * Finally, we have all of the possible failures behind us... | |
778 | * | |
779 | * Remove new GDT block from inode double-indirect block and clear out | |
780 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
781 | * from the reserved inode). We don't need to change the bitmaps for | |
782 | * these blocks, because they are marked as in-use from being in the | |
783 | * reserved inode, and will become GDT blocks (primary and backup). | |
784 | */ | |
617ba13b | 785 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
786 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
787 | if (unlikely(err)) { | |
788 | ext4_std_error(sb, err); | |
789 | goto exit_inode; | |
790 | } | |
ac27a0ec | 791 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 792 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
793 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
794 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
795 | if (unlikely(err)) { |
796 | ext4_std_error(sb, err); | |
797 | goto exit_inode; | |
798 | } | |
799 | brelse(dind); | |
ac27a0ec | 800 | |
617ba13b | 801 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 802 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 803 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 804 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
805 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
806 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 807 | ext4_kvfree(o_group_desc); |
ac27a0ec | 808 | |
e8546d06 | 809 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b50924c2 | 810 | err = ext4_handle_dirty_super(handle, sb); |
b4097142 TT |
811 | if (err) |
812 | ext4_std_error(sb, err); | |
ac27a0ec | 813 | |
b4097142 | 814 | return err; |
ac27a0ec DK |
815 | |
816 | exit_inode: | |
f18a5f21 | 817 | ext4_kvfree(n_group_desc); |
537a0310 | 818 | /* ext4_handle_release_buffer(handle, iloc.bh); */ |
ac27a0ec DK |
819 | brelse(iloc.bh); |
820 | exit_dindj: | |
537a0310 | 821 | /* ext4_handle_release_buffer(handle, dind); */ |
ac27a0ec | 822 | exit_sbh: |
537a0310 | 823 | /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ |
ac27a0ec DK |
824 | exit_dind: |
825 | brelse(dind); | |
826 | exit_bh: | |
2f919710 | 827 | brelse(gdb_bh); |
ac27a0ec | 828 | |
617ba13b | 829 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
830 | return err; |
831 | } | |
832 | ||
833 | /* | |
834 | * Called when we are adding a new group which has a backup copy of each of | |
835 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
836 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
837 | * that they are kept for future resizing and not allocated to files. | |
838 | * | |
839 | * Each reserved backup GDT block will go into a different indirect block. | |
840 | * The indirect blocks are actually the primary reserved GDT blocks, | |
841 | * so we know in advance what their block numbers are. We only get the | |
842 | * double-indirect block to verify it is pointing to the primary reserved | |
843 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
844 | * backup GDT blocks are stored in their reserved primary GDT block. | |
845 | */ | |
846 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 847 | ext4_group_t group) |
ac27a0ec DK |
848 | { |
849 | struct super_block *sb = inode->i_sb; | |
617ba13b | 850 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
851 | struct buffer_head **primary; |
852 | struct buffer_head *dind; | |
617ba13b MC |
853 | struct ext4_iloc iloc; |
854 | ext4_fsblk_t blk; | |
ac27a0ec DK |
855 | __le32 *data, *end; |
856 | int gdbackups = 0; | |
857 | int res, i; | |
858 | int err; | |
859 | ||
216553c4 | 860 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
861 | if (!primary) |
862 | return -ENOMEM; | |
863 | ||
617ba13b | 864 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
865 | dind = sb_bread(sb, le32_to_cpu(*data)); |
866 | if (!dind) { | |
867 | err = -EIO; | |
868 | goto exit_free; | |
869 | } | |
870 | ||
617ba13b | 871 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
872 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
873 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 874 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
875 | |
876 | /* Get each reserved primary GDT block and verify it holds backups */ | |
877 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
878 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 879 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
880 | " not at offset %ld", |
881 | blk, | |
882 | (long)(data - (__le32 *)dind->b_data)); | |
883 | err = -EINVAL; | |
884 | goto exit_bh; | |
885 | } | |
886 | primary[res] = sb_bread(sb, blk); | |
887 | if (!primary[res]) { | |
888 | err = -EIO; | |
889 | goto exit_bh; | |
890 | } | |
c72df9f9 YY |
891 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
892 | if (gdbackups < 0) { | |
ac27a0ec DK |
893 | brelse(primary[res]); |
894 | err = gdbackups; | |
895 | goto exit_bh; | |
896 | } | |
897 | if (++data >= end) | |
898 | data = (__le32 *)dind->b_data; | |
899 | } | |
900 | ||
901 | for (i = 0; i < reserved_gdb; i++) { | |
617ba13b | 902 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) { |
ac27a0ec DK |
903 | /* |
904 | int j; | |
905 | for (j = 0; j < i; j++) | |
537a0310 | 906 | ext4_handle_release_buffer(handle, primary[j]); |
ac27a0ec DK |
907 | */ |
908 | goto exit_bh; | |
909 | } | |
910 | } | |
911 | ||
617ba13b | 912 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
913 | goto exit_bh; |
914 | ||
915 | /* | |
916 | * Finally we can add each of the reserved backup GDT blocks from | |
917 | * the new group to its reserved primary GDT block. | |
918 | */ | |
668f4dc5 | 919 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
920 | for (i = 0; i < reserved_gdb; i++) { |
921 | int err2; | |
922 | data = (__le32 *)primary[i]->b_data; | |
923 | /* printk("reserving backup %lu[%u] = %lu\n", | |
924 | primary[i]->b_blocknr, gdbackups, | |
925 | blk + primary[i]->b_blocknr); */ | |
926 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 927 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
928 | if (!err) |
929 | err = err2; | |
930 | } | |
931 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 932 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
933 | |
934 | exit_bh: | |
935 | while (--res >= 0) | |
936 | brelse(primary[res]); | |
937 | brelse(dind); | |
938 | ||
939 | exit_free: | |
940 | kfree(primary); | |
941 | ||
942 | return err; | |
943 | } | |
944 | ||
945 | /* | |
617ba13b | 946 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
947 | * of the main resize transaction, because e2fsck will re-write them if there |
948 | * is a problem (basically only OOM will cause a problem). However, we | |
949 | * _should_ update the backups if possible, in case the primary gets trashed | |
950 | * for some reason and we need to run e2fsck from a backup superblock. The | |
951 | * important part is that the new block and inode counts are in the backup | |
952 | * superblocks, and the location of the new group metadata in the GDT backups. | |
953 | * | |
32ed5058 TT |
954 | * We do not need take the s_resize_lock for this, because these |
955 | * blocks are not otherwise touched by the filesystem code when it is | |
956 | * mounted. We don't need to worry about last changing from | |
957 | * sbi->s_groups_count, because the worst that can happen is that we | |
958 | * do not copy the full number of backups at this time. The resize | |
959 | * which changed s_groups_count will backup again. | |
ac27a0ec DK |
960 | */ |
961 | static void update_backups(struct super_block *sb, | |
962 | int blk_off, char *data, int size) | |
963 | { | |
617ba13b | 964 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 965 | const ext4_group_t last = sbi->s_groups_count; |
617ba13b | 966 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
967 | unsigned three = 1; |
968 | unsigned five = 5; | |
969 | unsigned seven = 7; | |
fd2d4291 | 970 | ext4_group_t group; |
ac27a0ec DK |
971 | int rest = sb->s_blocksize - size; |
972 | handle_t *handle; | |
973 | int err = 0, err2; | |
974 | ||
617ba13b | 975 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
976 | if (IS_ERR(handle)) { |
977 | group = 1; | |
978 | err = PTR_ERR(handle); | |
979 | goto exit_err; | |
980 | } | |
981 | ||
a9c47317 DW |
982 | ext4_superblock_csum_set(sb, (struct ext4_super_block *)data); |
983 | ||
617ba13b | 984 | while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { |
ac27a0ec DK |
985 | struct buffer_head *bh; |
986 | ||
987 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
988 | if (ext4_handle_valid(handle) && |
989 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
990 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
991 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
992 | break; |
993 | ||
994 | bh = sb_getblk(sb, group * bpg + blk_off); | |
995 | if (!bh) { | |
996 | err = -EIO; | |
997 | break; | |
998 | } | |
617ba13b | 999 | ext4_debug("update metadata backup %#04lx\n", |
ac27a0ec | 1000 | (unsigned long)bh->b_blocknr); |
617ba13b | 1001 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1002 | break; |
1003 | lock_buffer(bh); | |
1004 | memcpy(bh->b_data, data, size); | |
1005 | if (rest) | |
1006 | memset(bh->b_data + size, 0, rest); | |
1007 | set_buffer_uptodate(bh); | |
1008 | unlock_buffer(bh); | |
b4097142 TT |
1009 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1010 | if (unlikely(err)) | |
1011 | ext4_std_error(sb, err); | |
ac27a0ec DK |
1012 | brelse(bh); |
1013 | } | |
617ba13b | 1014 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1015 | err = err2; |
1016 | ||
1017 | /* | |
1018 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1019 | * late to revert the resize, we shouldn't fail just because of | |
1020 | * the backup copies (they are only needed in case of corruption). | |
1021 | * | |
1022 | * However, if we got here we have a journal problem too, so we | |
1023 | * can't really start a transaction to mark the superblock. | |
1024 | * Chicken out and just set the flag on the hope it will be written | |
1025 | * to disk, and if not - we will simply wait until next fsck. | |
1026 | */ | |
1027 | exit_err: | |
1028 | if (err) { | |
12062ddd | 1029 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1030 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1031 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1032 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1033 | mark_buffer_dirty(sbi->s_sbh); |
1034 | } | |
1035 | } | |
1036 | ||
bb08c1e7 YY |
1037 | /* |
1038 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1039 | * starting at @group | |
1040 | * | |
1041 | * @handle: journal handle | |
1042 | * @sb: super block | |
1043 | * @group: the group no. of the first group desc to be added | |
1044 | * @resize_inode: the resize inode | |
1045 | * @count: number of group descriptors to be added | |
1046 | */ | |
1047 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1048 | ext4_group_t group, struct inode *resize_inode, | |
1049 | ext4_group_t count) | |
1050 | { | |
1051 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1052 | struct ext4_super_block *es = sbi->s_es; | |
1053 | struct buffer_head *gdb_bh; | |
1054 | int i, gdb_off, gdb_num, err = 0; | |
1055 | ||
1056 | for (i = 0; i < count; i++, group++) { | |
1057 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1058 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1059 | ||
1060 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1061 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1062 | ||
1063 | /* | |
1064 | * We will only either add reserved group blocks to a backup group | |
1065 | * or remove reserved blocks for the first group in a new group block. | |
1066 | * Doing both would be mean more complex code, and sane people don't | |
1067 | * use non-sparse filesystems anymore. This is already checked above. | |
1068 | */ | |
1069 | if (gdb_off) { | |
1070 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1071 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1072 | ||
1073 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1074 | err = reserve_backup_gdb(handle, resize_inode, group); | |
1075 | } else | |
1076 | err = add_new_gdb(handle, resize_inode, group); | |
1077 | if (err) | |
1078 | break; | |
1079 | } | |
1080 | return err; | |
1081 | } | |
1082 | ||
41a246d1 DW |
1083 | static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) |
1084 | { | |
1085 | struct buffer_head *bh = sb_getblk(sb, block); | |
1086 | if (!bh) | |
1087 | return NULL; | |
1088 | ||
1089 | if (bitmap_uptodate(bh)) | |
1090 | return bh; | |
1091 | ||
1092 | lock_buffer(bh); | |
1093 | if (bh_submit_read(bh) < 0) { | |
1094 | unlock_buffer(bh); | |
1095 | brelse(bh); | |
1096 | return NULL; | |
1097 | } | |
1098 | unlock_buffer(bh); | |
1099 | ||
1100 | return bh; | |
1101 | } | |
1102 | ||
1103 | static int ext4_set_bitmap_checksums(struct super_block *sb, | |
1104 | ext4_group_t group, | |
1105 | struct ext4_group_desc *gdp, | |
1106 | struct ext4_new_group_data *group_data) | |
1107 | { | |
1108 | struct buffer_head *bh; | |
1109 | ||
1110 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1111 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
1112 | return 0; | |
1113 | ||
1114 | bh = ext4_get_bitmap(sb, group_data->inode_bitmap); | |
1115 | if (!bh) | |
1116 | return -EIO; | |
1117 | ext4_inode_bitmap_csum_set(sb, group, gdp, bh, | |
1118 | EXT4_INODES_PER_GROUP(sb) / 8); | |
1119 | brelse(bh); | |
1120 | ||
fa77dcfa DW |
1121 | bh = ext4_get_bitmap(sb, group_data->block_bitmap); |
1122 | if (!bh) | |
1123 | return -EIO; | |
1124 | ext4_block_bitmap_csum_set(sb, group, gdp, bh, | |
1125 | EXT4_BLOCKS_PER_GROUP(sb) / 8); | |
1126 | brelse(bh); | |
1127 | ||
41a246d1 DW |
1128 | return 0; |
1129 | } | |
1130 | ||
083f5b24 YY |
1131 | /* |
1132 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1133 | */ | |
1134 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1135 | struct ext4_new_flex_group_data *flex_gd) | |
1136 | { | |
1137 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1138 | struct ext4_group_desc *gdp; | |
1139 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1140 | struct buffer_head *gdb_bh; | |
1141 | ext4_group_t group; | |
1142 | __u16 *bg_flags = flex_gd->bg_flags; | |
1143 | int i, gdb_off, gdb_num, err = 0; | |
1144 | ||
1145 | ||
1146 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1147 | group = group_data->group; | |
1148 | ||
1149 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1150 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1151 | ||
1152 | /* | |
1153 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1154 | */ | |
1155 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1156 | /* Update group descriptor block for new group */ | |
2716b802 | 1157 | gdp = (struct ext4_group_desc *)(gdb_bh->b_data + |
083f5b24 YY |
1158 | gdb_off * EXT4_DESC_SIZE(sb)); |
1159 | ||
1160 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1161 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1162 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
41a246d1 DW |
1163 | err = ext4_set_bitmap_checksums(sb, group, gdp, group_data); |
1164 | if (err) { | |
1165 | ext4_std_error(sb, err); | |
1166 | break; | |
1167 | } | |
1168 | ||
083f5b24 YY |
1169 | ext4_inode_table_set(sb, gdp, group_data->inode_table); |
1170 | ext4_free_group_clusters_set(sb, gdp, | |
1171 | EXT4_B2C(sbi, group_data->free_blocks_count)); | |
1172 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); | |
1173 | gdp->bg_flags = cpu_to_le16(*bg_flags); | |
feb0ab32 | 1174 | ext4_group_desc_csum_set(sb, group, gdp); |
083f5b24 YY |
1175 | |
1176 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1177 | if (unlikely(err)) { | |
1178 | ext4_std_error(sb, err); | |
1179 | break; | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * We can allocate memory for mb_alloc based on the new group | |
1184 | * descriptor | |
1185 | */ | |
1186 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1187 | if (err) | |
1188 | break; | |
1189 | } | |
1190 | return err; | |
1191 | } | |
1192 | ||
2e10e2f2 YY |
1193 | /* |
1194 | * ext4_update_super() updates the super block so that the newly added | |
1195 | * groups can be seen by the filesystem. | |
1196 | * | |
1197 | * @sb: super block | |
1198 | * @flex_gd: new added groups | |
1199 | */ | |
1200 | static void ext4_update_super(struct super_block *sb, | |
1201 | struct ext4_new_flex_group_data *flex_gd) | |
1202 | { | |
1203 | ext4_fsblk_t blocks_count = 0; | |
1204 | ext4_fsblk_t free_blocks = 0; | |
1205 | ext4_fsblk_t reserved_blocks = 0; | |
1206 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1207 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1208 | struct ext4_super_block *es = sbi->s_es; | |
8a991849 | 1209 | int i; |
2e10e2f2 YY |
1210 | |
1211 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1212 | /* | |
1213 | * Make the new blocks and inodes valid next. We do this before | |
1214 | * increasing the group count so that once the group is enabled, | |
1215 | * all of its blocks and inodes are already valid. | |
1216 | * | |
1217 | * We always allocate group-by-group, then block-by-block or | |
1218 | * inode-by-inode within a group, so enabling these | |
1219 | * blocks/inodes before the group is live won't actually let us | |
1220 | * allocate the new space yet. | |
1221 | */ | |
1222 | for (i = 0; i < flex_gd->count; i++) { | |
1223 | blocks_count += group_data[i].blocks_count; | |
1224 | free_blocks += group_data[i].free_blocks_count; | |
1225 | } | |
1226 | ||
1227 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
1228 | do_div(reserved_blocks, ext4_blocks_count(es)); | |
1229 | reserved_blocks *= blocks_count; | |
1230 | do_div(reserved_blocks, 100); | |
1231 | ||
1232 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1233 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1234 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1235 | flex_gd->count); | |
636d7e2e DW |
1236 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1237 | flex_gd->count); | |
2e10e2f2 YY |
1238 | |
1239 | /* | |
1240 | * We need to protect s_groups_count against other CPUs seeing | |
1241 | * inconsistent state in the superblock. | |
1242 | * | |
1243 | * The precise rules we use are: | |
1244 | * | |
1245 | * * Writers must perform a smp_wmb() after updating all | |
1246 | * dependent data and before modifying the groups count | |
1247 | * | |
1248 | * * Readers must perform an smp_rmb() after reading the groups | |
1249 | * count and before reading any dependent data. | |
1250 | * | |
1251 | * NB. These rules can be relaxed when checking the group count | |
1252 | * while freeing data, as we can only allocate from a block | |
1253 | * group after serialising against the group count, and we can | |
1254 | * only then free after serialising in turn against that | |
1255 | * allocation. | |
1256 | */ | |
1257 | smp_wmb(); | |
1258 | ||
1259 | /* Update the global fs size fields */ | |
1260 | sbi->s_groups_count += flex_gd->count; | |
1261 | ||
1262 | /* Update the reserved block counts only once the new group is | |
1263 | * active. */ | |
1264 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1265 | reserved_blocks); | |
1266 | ||
1267 | /* Update the free space counts */ | |
1268 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
1269 | EXT4_B2C(sbi, free_blocks)); | |
1270 | percpu_counter_add(&sbi->s_freeinodes_counter, | |
1271 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1272 | ||
1273 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, | |
1274 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1275 | sbi->s_log_groups_per_flex) { | |
1276 | ext4_group_t flex_group; | |
1277 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
1278 | atomic_add(EXT4_B2C(sbi, free_blocks), | |
1279 | &sbi->s_flex_groups[flex_group].free_clusters); | |
1280 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, | |
1281 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1282 | } | |
1283 | ||
952fc18e TT |
1284 | /* |
1285 | * Update the fs overhead information | |
1286 | */ | |
1287 | ext4_calculate_overhead(sb); | |
1288 | ||
2e10e2f2 YY |
1289 | if (test_opt(sb, DEBUG)) |
1290 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1291 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1292 | blocks_count, free_blocks, reserved_blocks); | |
1293 | } | |
1294 | ||
4bac1f8c YY |
1295 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1296 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1297 | * transaction and not have it write the data to disk. | |
1298 | */ | |
1299 | static int ext4_flex_group_add(struct super_block *sb, | |
1300 | struct inode *resize_inode, | |
1301 | struct ext4_new_flex_group_data *flex_gd) | |
1302 | { | |
1303 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1304 | struct ext4_super_block *es = sbi->s_es; | |
1305 | ext4_fsblk_t o_blocks_count; | |
1306 | ext4_grpblk_t last; | |
1307 | ext4_group_t group; | |
1308 | handle_t *handle; | |
1309 | unsigned reserved_gdb; | |
1310 | int err = 0, err2 = 0, credit; | |
1311 | ||
1312 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1313 | ||
1314 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1315 | o_blocks_count = ext4_blocks_count(es); | |
1316 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1317 | BUG_ON(last); | |
1318 | ||
1319 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1320 | if (err) | |
1321 | goto exit; | |
1322 | /* | |
1323 | * We will always be modifying at least the superblock and GDT | |
1324 | * block. If we are adding a group past the last current GDT block, | |
1325 | * we will also modify the inode and the dindirect block. If we | |
1326 | * are adding a group with superblock/GDT backups we will also | |
1327 | * modify each of the reserved GDT dindirect blocks. | |
1328 | */ | |
1329 | credit = flex_gd->count * 4 + reserved_gdb; | |
1330 | handle = ext4_journal_start_sb(sb, credit); | |
1331 | if (IS_ERR(handle)) { | |
1332 | err = PTR_ERR(handle); | |
1333 | goto exit; | |
1334 | } | |
1335 | ||
1336 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1337 | if (err) | |
1338 | goto exit_journal; | |
1339 | ||
1340 | group = flex_gd->groups[0].group; | |
1341 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); | |
1342 | err = ext4_add_new_descs(handle, sb, group, | |
1343 | resize_inode, flex_gd->count); | |
1344 | if (err) | |
1345 | goto exit_journal; | |
1346 | ||
1347 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1348 | if (err) | |
1349 | goto exit_journal; | |
1350 | ||
1351 | ext4_update_super(sb, flex_gd); | |
1352 | ||
1353 | err = ext4_handle_dirty_super(handle, sb); | |
1354 | ||
1355 | exit_journal: | |
1356 | err2 = ext4_journal_stop(handle); | |
1357 | if (!err) | |
1358 | err = err2; | |
1359 | ||
1360 | if (!err) { | |
2ebd1704 YY |
1361 | int gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
1362 | int gdb_num_end = ((group + flex_gd->count - 1) / | |
1363 | EXT4_DESC_PER_BLOCK(sb)); | |
1364 | ||
4bac1f8c YY |
1365 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
1366 | sizeof(struct ext4_super_block)); | |
2ebd1704 | 1367 | for (; gdb_num <= gdb_num_end; gdb_num++) { |
4bac1f8c | 1368 | struct buffer_head *gdb_bh; |
2ebd1704 | 1369 | |
4bac1f8c YY |
1370 | gdb_bh = sbi->s_group_desc[gdb_num]; |
1371 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, | |
1372 | gdb_bh->b_size); | |
1373 | } | |
1374 | } | |
1375 | exit: | |
1376 | return err; | |
1377 | } | |
1378 | ||
19c5246d YY |
1379 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1380 | struct ext4_new_flex_group_data *flex_gd, | |
1381 | ext4_fsblk_t n_blocks_count, | |
1382 | unsigned long flexbg_size) | |
1383 | { | |
1384 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1385 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1386 | ext4_fsblk_t o_blocks_count; | |
1387 | ext4_group_t n_group; | |
1388 | ext4_group_t group; | |
1389 | ext4_group_t last_group; | |
1390 | ext4_grpblk_t last; | |
1391 | ext4_grpblk_t blocks_per_group; | |
1392 | unsigned long i; | |
1393 | ||
1394 | blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); | |
1395 | ||
1396 | o_blocks_count = ext4_blocks_count(es); | |
1397 | ||
1398 | if (o_blocks_count == n_blocks_count) | |
1399 | return 0; | |
1400 | ||
1401 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1402 | BUG_ON(last); | |
1403 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1404 | ||
1405 | last_group = group | (flexbg_size - 1); | |
1406 | if (last_group > n_group) | |
1407 | last_group = n_group; | |
1408 | ||
1409 | flex_gd->count = last_group - group + 1; | |
1410 | ||
1411 | for (i = 0; i < flex_gd->count; i++) { | |
1412 | int overhead; | |
1413 | ||
1414 | group_data[i].group = group + i; | |
1415 | group_data[i].blocks_count = blocks_per_group; | |
1416 | overhead = ext4_bg_has_super(sb, group + i) ? | |
1417 | (1 + ext4_bg_num_gdb(sb, group + i) + | |
1418 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
1419 | group_data[i].free_blocks_count = blocks_per_group - overhead; | |
feb0ab32 | 1420 | if (ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1421 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | |
1422 | EXT4_BG_INODE_UNINIT; | |
1423 | else | |
1424 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; | |
1425 | } | |
1426 | ||
feb0ab32 | 1427 | if (last_group == n_group && ext4_has_group_desc_csum(sb)) |
19c5246d YY |
1428 | /* We need to initialize block bitmap of last group. */ |
1429 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1430 | ||
1431 | if ((last_group == n_group) && (last != blocks_per_group - 1)) { | |
1432 | group_data[i - 1].blocks_count = last + 1; | |
1433 | group_data[i - 1].free_blocks_count -= blocks_per_group- | |
1434 | last - 1; | |
1435 | } | |
1436 | ||
1437 | return 1; | |
1438 | } | |
1439 | ||
ac27a0ec DK |
1440 | /* Add group descriptor data to an existing or new group descriptor block. |
1441 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1442 | * the filesystem, because we cannot abort the transaction and not have it | |
1443 | * write the data to disk. | |
1444 | * | |
1445 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1446 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1447 | * | |
1448 | * We only need to hold the superblock lock while we are actually adding | |
1449 | * in the new group's counts to the superblock. Prior to that we have | |
1450 | * not really "added" the group at all. We re-check that we are still | |
1451 | * adding in the last group in case things have changed since verifying. | |
1452 | */ | |
617ba13b | 1453 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1454 | { |
61f296cc | 1455 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1456 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1457 | struct ext4_super_block *es = sbi->s_es; | |
1458 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1459 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1460 | struct inode *inode = NULL; |
ac27a0ec | 1461 | int gdb_off, gdb_num; |
61f296cc YY |
1462 | int err; |
1463 | __u16 bg_flags = 0; | |
ac27a0ec | 1464 | |
617ba13b MC |
1465 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
1466 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 1467 | |
617ba13b MC |
1468 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1469 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1470 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1471 | return -EPERM; |
1472 | } | |
1473 | ||
bd81d8ee LV |
1474 | if (ext4_blocks_count(es) + input->blocks_count < |
1475 | ext4_blocks_count(es)) { | |
12062ddd | 1476 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1477 | return -EINVAL; |
1478 | } | |
1479 | ||
617ba13b | 1480 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1481 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1482 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1483 | return -EINVAL; |
1484 | } | |
1485 | ||
1486 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1487 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1488 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1489 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1490 | ext4_warning(sb, |
ac27a0ec DK |
1491 | "No reserved GDT blocks, can't resize"); |
1492 | return -EPERM; | |
1493 | } | |
1d1fe1ee DH |
1494 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1495 | if (IS_ERR(inode)) { | |
12062ddd | 1496 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1497 | return PTR_ERR(inode); |
ac27a0ec DK |
1498 | } |
1499 | } | |
1500 | ||
920313a7 | 1501 | |
61f296cc | 1502 | err = verify_group_input(sb, input); |
08c3a813 | 1503 | if (err) |
61f296cc | 1504 | goto out; |
ac27a0ec | 1505 | |
117fff10 TT |
1506 | err = ext4_alloc_flex_bg_array(sb, input->group + 1); |
1507 | if (err) | |
1508 | return err; | |
1509 | ||
61f296cc YY |
1510 | flex_gd.count = 1; |
1511 | flex_gd.groups = input; | |
1512 | flex_gd.bg_flags = &bg_flags; | |
1513 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1514 | out: | |
ac27a0ec DK |
1515 | iput(inode); |
1516 | return err; | |
617ba13b | 1517 | } /* ext4_group_add */ |
ac27a0ec | 1518 | |
18e31438 YY |
1519 | /* |
1520 | * extend a group without checking assuming that checking has been done. | |
1521 | */ | |
1522 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1523 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1524 | { | |
1525 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1526 | handle_t *handle; | |
1527 | int err = 0, err2; | |
1528 | ||
1529 | /* We will update the superblock, one block bitmap, and | |
1530 | * one group descriptor via ext4_group_add_blocks(). | |
1531 | */ | |
1532 | handle = ext4_journal_start_sb(sb, 3); | |
1533 | if (IS_ERR(handle)) { | |
1534 | err = PTR_ERR(handle); | |
1535 | ext4_warning(sb, "error %d on journal start", err); | |
1536 | return err; | |
1537 | } | |
1538 | ||
1539 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1540 | if (err) { | |
1541 | ext4_warning(sb, "error %d on journal write access", err); | |
1542 | goto errout; | |
1543 | } | |
1544 | ||
1545 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1546 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1547 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1548 | o_blocks_count + add); | |
1549 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1550 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1551 | if (err) | |
1552 | goto errout; | |
1553 | ext4_handle_dirty_super(handle, sb); | |
1554 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1555 | o_blocks_count + add); | |
1556 | errout: | |
1557 | err2 = ext4_journal_stop(handle); | |
1558 | if (err2 && !err) | |
1559 | err = err2; | |
1560 | ||
1561 | if (!err) { | |
1562 | if (test_opt(sb, DEBUG)) | |
1563 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1564 | "blocks\n", ext4_blocks_count(es)); | |
1565 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, | |
1566 | sizeof(struct ext4_super_block)); | |
1567 | } | |
1568 | return err; | |
1569 | } | |
1570 | ||
2b2d6d01 TT |
1571 | /* |
1572 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1573 | * point is only used to extend the current filesystem to the end of the last |
1574 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1575 | * for emergencies (because it has no dependencies on reserved blocks). | |
1576 | * | |
617ba13b | 1577 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1578 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1579 | * GDT blocks are reserved to grow to the desired size. | |
1580 | */ | |
617ba13b MC |
1581 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1582 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1583 | { |
617ba13b | 1584 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1585 | ext4_grpblk_t last; |
1586 | ext4_grpblk_t add; | |
af5bc92d | 1587 | struct buffer_head *bh; |
d89651c8 | 1588 | int err; |
5f21b0e6 | 1589 | ext4_group_t group; |
ac27a0ec | 1590 | |
bd81d8ee | 1591 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1592 | |
1593 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1594 | ext4_msg(sb, KERN_DEBUG, |
1595 | "extending last group from %llu to %llu blocks", | |
1596 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1597 | |
1598 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1599 | return 0; | |
1600 | ||
1601 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1602 | ext4_msg(sb, KERN_ERR, |
1603 | "filesystem too large to resize to %llu blocks safely", | |
1604 | n_blocks_count); | |
ac27a0ec | 1605 | if (sizeof(sector_t) < 8) |
12062ddd | 1606 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1607 | return -EINVAL; |
1608 | } | |
1609 | ||
1610 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1611 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1612 | return -EINVAL; |
ac27a0ec DK |
1613 | } |
1614 | ||
1615 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1616 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1617 | |
1618 | if (last == 0) { | |
12062ddd | 1619 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1620 | return -EPERM; |
1621 | } | |
1622 | ||
617ba13b | 1623 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1624 | |
1625 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1626 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1627 | return -EINVAL; |
1628 | } | |
1629 | ||
1630 | if (o_blocks_count + add > n_blocks_count) | |
1631 | add = n_blocks_count - o_blocks_count; | |
1632 | ||
1633 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1634 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1635 | o_blocks_count + add, add); |
1636 | ||
1637 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1638 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1639 | if (!bh) { |
12062ddd | 1640 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1641 | return -ENOSPC; |
1642 | } | |
1643 | brelse(bh); | |
1644 | ||
d89651c8 | 1645 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1646 | return err; |
617ba13b | 1647 | } /* ext4_group_extend */ |
19c5246d YY |
1648 | |
1649 | /* | |
1650 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1651 | * | |
1652 | * @sb: super block of the fs to be resized | |
1653 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1654 | */ | |
1655 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1656 | { | |
1657 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1658 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1659 | struct ext4_super_block *es = sbi->s_es; | |
1660 | struct buffer_head *bh; | |
1661 | struct inode *resize_inode; | |
1662 | ext4_fsblk_t o_blocks_count; | |
1663 | ext4_group_t o_group; | |
1664 | ext4_group_t n_group; | |
a0ade1de | 1665 | ext4_grpblk_t offset, add; |
19c5246d YY |
1666 | unsigned long n_desc_blocks; |
1667 | unsigned long o_desc_blocks; | |
1668 | unsigned long desc_blocks; | |
117fff10 | 1669 | int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex; |
19c5246d YY |
1670 | |
1671 | o_blocks_count = ext4_blocks_count(es); | |
1672 | ||
1673 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1674 | ext4_msg(sb, KERN_DEBUG, "resizing filesystem from %llu " |
1675 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1676 | |
1677 | if (n_blocks_count < o_blocks_count) { | |
1678 | /* On-line shrinking not supported */ | |
1679 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1680 | return -EINVAL; | |
1681 | } | |
1682 | ||
1683 | if (n_blocks_count == o_blocks_count) | |
1684 | /* Nothing need to do */ | |
1685 | return 0; | |
1686 | ||
1687 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); | |
a0ade1de | 1688 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d YY |
1689 | |
1690 | n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) / | |
1691 | EXT4_DESC_PER_BLOCK(sb); | |
1692 | o_desc_blocks = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / | |
1693 | EXT4_DESC_PER_BLOCK(sb); | |
1694 | desc_blocks = n_desc_blocks - o_desc_blocks; | |
1695 | ||
1696 | if (desc_blocks && | |
1697 | (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE) || | |
1698 | le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks)) { | |
1699 | ext4_warning(sb, "No reserved GDT blocks, can't resize"); | |
1700 | return -EPERM; | |
1701 | } | |
1702 | ||
1703 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
1704 | if (IS_ERR(resize_inode)) { | |
1705 | ext4_warning(sb, "Error opening resize inode"); | |
1706 | return PTR_ERR(resize_inode); | |
1707 | } | |
1708 | ||
1709 | /* See if the device is actually as big as what was requested */ | |
1710 | bh = sb_bread(sb, n_blocks_count - 1); | |
1711 | if (!bh) { | |
1712 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1713 | return -ENOSPC; | |
1714 | } | |
1715 | brelse(bh); | |
1716 | ||
a0ade1de LC |
1717 | /* extend the last group */ |
1718 | if (n_group == o_group) | |
1719 | add = n_blocks_count - o_blocks_count; | |
1720 | else | |
1721 | add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); | |
1722 | if (add > 0) { | |
19c5246d YY |
1723 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1724 | if (err) | |
1725 | goto out; | |
1726 | } | |
1727 | ||
d7574ad0 | 1728 | if (ext4_blocks_count(es) == n_blocks_count) |
19c5246d YY |
1729 | goto out; |
1730 | ||
117fff10 TT |
1731 | err = ext4_alloc_flex_bg_array(sb, n_group + 1); |
1732 | if (err) | |
1733 | return err; | |
1734 | ||
19c5246d YY |
1735 | flex_gd = alloc_flex_gd(flexbg_size); |
1736 | if (flex_gd == NULL) { | |
1737 | err = -ENOMEM; | |
1738 | goto out; | |
1739 | } | |
1740 | ||
1741 | /* Add flex groups. Note that a regular group is a | |
1742 | * flex group with 1 group. | |
1743 | */ | |
1744 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
1745 | flexbg_size)) { | |
03c1c290 YY |
1746 | if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0) |
1747 | break; | |
19c5246d YY |
1748 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); |
1749 | if (unlikely(err)) | |
1750 | break; | |
1751 | } | |
1752 | ||
1753 | out: | |
1754 | if (flex_gd) | |
1755 | free_flex_gd(flex_gd); | |
1756 | ||
1757 | iput(resize_inode); | |
1758 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1759 | ext4_msg(sb, KERN_DEBUG, "resized filesystem from %llu " |
1760 | "upto %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1761 | return err; |
1762 | } |