]>
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 | ||
164 | flex_gd->count = flexbg_size; | |
165 | ||
166 | flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) * | |
167 | flexbg_size, GFP_NOFS); | |
168 | if (flex_gd->groups == NULL) | |
169 | goto out2; | |
170 | ||
171 | flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS); | |
172 | if (flex_gd->bg_flags == NULL) | |
173 | goto out1; | |
174 | ||
175 | return flex_gd; | |
176 | ||
177 | out1: | |
178 | kfree(flex_gd->groups); | |
179 | out2: | |
180 | kfree(flex_gd); | |
181 | out3: | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd) | |
186 | { | |
187 | kfree(flex_gd->bg_flags); | |
188 | kfree(flex_gd->groups); | |
189 | kfree(flex_gd); | |
190 | } | |
191 | ||
ac27a0ec | 192 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 193 | ext4_fsblk_t blk) |
ac27a0ec DK |
194 | { |
195 | struct buffer_head *bh; | |
196 | int err; | |
197 | ||
198 | bh = sb_getblk(sb, blk); | |
199 | if (!bh) | |
200 | return ERR_PTR(-EIO); | |
617ba13b | 201 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
202 | brelse(bh); |
203 | bh = ERR_PTR(err); | |
204 | } else { | |
ac27a0ec DK |
205 | memset(bh->b_data, 0, sb->s_blocksize); |
206 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
207 | } |
208 | ||
209 | return bh; | |
210 | } | |
211 | ||
14904107 ES |
212 | /* |
213 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
214 | * If that fails, restart the transaction & regain write access for the | |
215 | * buffer head which is used for block_bitmap modifications. | |
216 | */ | |
6d40bc5a | 217 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
218 | { |
219 | int err; | |
220 | ||
0390131b | 221 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
222 | return 0; |
223 | ||
224 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
225 | if (err < 0) | |
226 | return err; | |
227 | if (err) { | |
6d40bc5a YY |
228 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
229 | if (err) | |
14904107 | 230 | return err; |
2b2d6d01 | 231 | } |
14904107 ES |
232 | |
233 | return 0; | |
234 | } | |
235 | ||
33afdcc5 YY |
236 | /* |
237 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
238 | * | |
239 | * Helper function for ext4_setup_new_group_blocks() which set . | |
240 | * | |
241 | * @sb: super block | |
242 | * @handle: journal handle | |
243 | * @flex_gd: flex group data | |
244 | */ | |
245 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
246 | struct ext4_new_flex_group_data *flex_gd, | |
247 | ext4_fsblk_t block, ext4_group_t count) | |
248 | { | |
249 | ext4_group_t count2; | |
250 | ||
251 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
252 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
253 | ext4_fsblk_t start; | |
254 | struct buffer_head *bh; | |
255 | ext4_group_t group; | |
256 | int err; | |
257 | ||
258 | ext4_get_group_no_and_offset(sb, block, &group, NULL); | |
259 | start = ext4_group_first_block_no(sb, group); | |
260 | group -= flex_gd->groups[0].group; | |
261 | ||
262 | count2 = sb->s_blocksize * 8 - (block - start); | |
263 | if (count2 > count) | |
264 | count2 = count; | |
265 | ||
266 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
267 | BUG_ON(flex_gd->count > 1); | |
268 | continue; | |
269 | } | |
270 | ||
271 | err = extend_or_restart_transaction(handle, 1); | |
272 | if (err) | |
273 | return err; | |
274 | ||
275 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
276 | if (!bh) | |
277 | return -EIO; | |
278 | ||
279 | err = ext4_journal_get_write_access(handle, bh); | |
280 | if (err) | |
281 | return err; | |
282 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
283 | block - start, count2); | |
284 | ext4_set_bits(bh->b_data, block - start, count2); | |
285 | ||
286 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
287 | if (unlikely(err)) | |
288 | return err; | |
289 | brelse(bh); | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
297 | * This doesn't need to be part of the main transaction, since we are only | |
298 | * changing blocks outside the actual filesystem. We still do journaling to | |
299 | * ensure the recovery is correct in case of a failure just after resize. | |
300 | * If any part of this fails, we simply abort the resize. | |
301 | * | |
302 | * setup_new_flex_group_blocks handles a flex group as follow: | |
303 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
304 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
305 | * super block and GDT. | |
306 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
307 | * bitmap for blocks taken by group tables. | |
308 | */ | |
309 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
310 | struct ext4_new_flex_group_data *flex_gd) | |
311 | { | |
312 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
313 | ext4_fsblk_t start; | |
314 | ext4_fsblk_t block; | |
315 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
316 | struct ext4_super_block *es = sbi->s_es; | |
317 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
318 | __u16 *bg_flags = flex_gd->bg_flags; | |
319 | handle_t *handle; | |
320 | ext4_group_t group, count; | |
321 | struct buffer_head *bh = NULL; | |
322 | int reserved_gdb, i, j, err = 0, err2; | |
323 | ||
324 | BUG_ON(!flex_gd->count || !group_data || | |
325 | group_data[0].group != sbi->s_groups_count); | |
326 | ||
327 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
328 | ||
329 | /* This transaction may be extended/restarted along the way */ | |
330 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
331 | if (IS_ERR(handle)) | |
332 | return PTR_ERR(handle); | |
333 | ||
334 | group = group_data[0].group; | |
335 | for (i = 0; i < flex_gd->count; i++, group++) { | |
336 | unsigned long gdblocks; | |
337 | ||
338 | gdblocks = ext4_bg_num_gdb(sb, group); | |
339 | start = ext4_group_first_block_no(sb, group); | |
340 | ||
341 | /* Copy all of the GDT blocks into the backup in this group */ | |
342 | for (j = 0, block = start + 1; j < gdblocks; j++, block++) { | |
343 | struct buffer_head *gdb; | |
344 | ||
345 | ext4_debug("update backup group %#04llx\n", block); | |
346 | err = extend_or_restart_transaction(handle, 1); | |
347 | if (err) | |
348 | goto out; | |
349 | ||
350 | gdb = sb_getblk(sb, block); | |
351 | if (!gdb) { | |
352 | err = -EIO; | |
353 | goto out; | |
354 | } | |
355 | ||
356 | err = ext4_journal_get_write_access(handle, gdb); | |
357 | if (err) { | |
358 | brelse(gdb); | |
359 | goto out; | |
360 | } | |
361 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
362 | gdb->b_size); | |
363 | set_buffer_uptodate(gdb); | |
364 | ||
365 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
366 | if (unlikely(err)) { | |
367 | brelse(gdb); | |
368 | goto out; | |
369 | } | |
370 | brelse(gdb); | |
371 | } | |
372 | ||
373 | /* Zero out all of the reserved backup group descriptor | |
374 | * table blocks | |
375 | */ | |
376 | if (ext4_bg_has_super(sb, group)) { | |
377 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
378 | reserved_gdb, GFP_NOFS); | |
379 | if (err) | |
380 | goto out; | |
381 | } | |
382 | ||
383 | /* Initialize group tables of the grop @group */ | |
384 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
385 | goto handle_bb; | |
386 | ||
387 | /* Zero out all of the inode table blocks */ | |
388 | block = group_data[i].inode_table; | |
389 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
390 | block, sbi->s_itb_per_group); | |
391 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
392 | GFP_NOFS); | |
393 | if (err) | |
394 | goto out; | |
395 | ||
396 | handle_bb: | |
397 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
398 | goto handle_ib; | |
399 | ||
400 | /* Initialize block bitmap of the @group */ | |
401 | block = group_data[i].block_bitmap; | |
402 | err = extend_or_restart_transaction(handle, 1); | |
403 | if (err) | |
404 | goto out; | |
405 | ||
406 | bh = bclean(handle, sb, block); | |
407 | if (IS_ERR(bh)) { | |
408 | err = PTR_ERR(bh); | |
409 | goto out; | |
410 | } | |
411 | if (ext4_bg_has_super(sb, group)) { | |
412 | ext4_debug("mark backup superblock %#04llx (+0)\n", | |
413 | start); | |
414 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + | |
415 | 1); | |
416 | } | |
417 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
418 | sb->s_blocksize * 8, bh->b_data); | |
419 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
420 | if (err) | |
421 | goto out; | |
422 | brelse(bh); | |
423 | ||
424 | handle_ib: | |
425 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
426 | continue; | |
427 | ||
428 | /* Initialize inode bitmap of the @group */ | |
429 | block = group_data[i].inode_bitmap; | |
430 | err = extend_or_restart_transaction(handle, 1); | |
431 | if (err) | |
432 | goto out; | |
433 | /* Mark unused entries in inode bitmap used */ | |
434 | bh = bclean(handle, sb, block); | |
435 | if (IS_ERR(bh)) { | |
436 | err = PTR_ERR(bh); | |
437 | goto out; | |
438 | } | |
439 | ||
440 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
441 | sb->s_blocksize * 8, bh->b_data); | |
442 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
443 | if (err) | |
444 | goto out; | |
445 | brelse(bh); | |
446 | } | |
447 | bh = NULL; | |
448 | ||
449 | /* Mark group tables in block bitmap */ | |
450 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
451 | count = group_table_count[j]; | |
452 | start = (&group_data[0].block_bitmap)[j]; | |
453 | block = start; | |
454 | for (i = 1; i < flex_gd->count; i++) { | |
455 | block += group_table_count[j]; | |
456 | if (block == (&group_data[i].block_bitmap)[j]) { | |
457 | count += group_table_count[j]; | |
458 | continue; | |
459 | } | |
460 | err = set_flexbg_block_bitmap(sb, handle, | |
461 | flex_gd, start, count); | |
462 | if (err) | |
463 | goto out; | |
464 | count = group_table_count[j]; | |
465 | start = group_data[i].block_bitmap; | |
466 | block = start; | |
467 | } | |
468 | ||
469 | if (count) { | |
470 | err = set_flexbg_block_bitmap(sb, handle, | |
471 | flex_gd, start, count); | |
472 | if (err) | |
473 | goto out; | |
474 | } | |
475 | } | |
476 | ||
477 | out: | |
478 | brelse(bh); | |
479 | err2 = ext4_journal_stop(handle); | |
480 | if (err2 && !err) | |
481 | err = err2; | |
482 | ||
483 | return err; | |
484 | } | |
485 | ||
ac27a0ec DK |
486 | /* |
487 | * Set up the block and inode bitmaps, and the inode table for the new group. | |
488 | * This doesn't need to be part of the main transaction, since we are only | |
489 | * changing blocks outside the actual filesystem. We still do journaling to | |
490 | * ensure the recovery is correct in case of a failure just after resize. | |
491 | * If any part of this fails, we simply abort the resize. | |
492 | */ | |
493 | static int setup_new_group_blocks(struct super_block *sb, | |
617ba13b | 494 | struct ext4_new_group_data *input) |
ac27a0ec | 495 | { |
617ba13b MC |
496 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
497 | ext4_fsblk_t start = ext4_group_first_block_no(sb, input->group); | |
498 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 499 | le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0; |
617ba13b | 500 | unsigned long gdblocks = ext4_bg_num_gdb(sb, input->group); |
ac27a0ec DK |
501 | struct buffer_head *bh; |
502 | handle_t *handle; | |
617ba13b MC |
503 | ext4_fsblk_t block; |
504 | ext4_grpblk_t bit; | |
ac27a0ec DK |
505 | int i; |
506 | int err = 0, err2; | |
507 | ||
14904107 ES |
508 | /* This transaction may be extended/restarted along the way */ |
509 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
510 | ||
ac27a0ec DK |
511 | if (IS_ERR(handle)) |
512 | return PTR_ERR(handle); | |
513 | ||
8f82f840 | 514 | BUG_ON(input->group != sbi->s_groups_count); |
ac27a0ec | 515 | |
ac27a0ec DK |
516 | /* Copy all of the GDT blocks into the backup in this group */ |
517 | for (i = 0, bit = 1, block = start + 1; | |
518 | i < gdblocks; i++, block++, bit++) { | |
519 | struct buffer_head *gdb; | |
520 | ||
c549a95d | 521 | ext4_debug("update backup group %#04llx (+%d)\n", block, bit); |
6d40bc5a YY |
522 | err = extend_or_restart_transaction(handle, 1); |
523 | if (err) | |
524 | goto exit_journal; | |
14904107 | 525 | |
ac27a0ec DK |
526 | gdb = sb_getblk(sb, block); |
527 | if (!gdb) { | |
528 | err = -EIO; | |
6d40bc5a | 529 | goto exit_journal; |
ac27a0ec | 530 | } |
617ba13b | 531 | if ((err = ext4_journal_get_write_access(handle, gdb))) { |
ac27a0ec | 532 | brelse(gdb); |
6d40bc5a | 533 | goto exit_journal; |
ac27a0ec | 534 | } |
5b615287 | 535 | memcpy(gdb->b_data, sbi->s_group_desc[i]->b_data, gdb->b_size); |
ac27a0ec | 536 | set_buffer_uptodate(gdb); |
b4097142 TT |
537 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); |
538 | if (unlikely(err)) { | |
539 | brelse(gdb); | |
6d40bc5a | 540 | goto exit_journal; |
b4097142 | 541 | } |
ac27a0ec DK |
542 | brelse(gdb); |
543 | } | |
544 | ||
545 | /* Zero out all of the reserved backup group descriptor table blocks */ | |
da488945 | 546 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
a31437b8 LC |
547 | block, sbi->s_itb_per_group); |
548 | err = sb_issue_zeroout(sb, gdblocks + start + 1, reserved_gdb, | |
a107e5a3 | 549 | GFP_NOFS); |
a31437b8 | 550 | if (err) |
6d40bc5a YY |
551 | goto exit_journal; |
552 | ||
553 | err = extend_or_restart_transaction(handle, 2); | |
554 | if (err) | |
555 | goto exit_journal; | |
556 | ||
557 | bh = bclean(handle, sb, input->block_bitmap); | |
558 | if (IS_ERR(bh)) { | |
559 | err = PTR_ERR(bh); | |
560 | goto exit_journal; | |
561 | } | |
c3e94d1d YY |
562 | |
563 | if (ext4_bg_has_super(sb, input->group)) { | |
564 | ext4_debug("mark backup group tables %#04llx (+0)\n", start); | |
565 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + 1); | |
566 | } | |
14904107 | 567 | |
c549a95d | 568 | ext4_debug("mark block bitmap %#04llx (+%llu)\n", input->block_bitmap, |
ac27a0ec | 569 | input->block_bitmap - start); |
617ba13b | 570 | ext4_set_bit(input->block_bitmap - start, bh->b_data); |
c549a95d | 571 | ext4_debug("mark inode bitmap %#04llx (+%llu)\n", input->inode_bitmap, |
ac27a0ec | 572 | input->inode_bitmap - start); |
617ba13b | 573 | ext4_set_bit(input->inode_bitmap - start, bh->b_data); |
ac27a0ec DK |
574 | |
575 | /* Zero out all of the inode table blocks */ | |
a31437b8 | 576 | block = input->inode_table; |
da488945 | 577 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", |
a31437b8 | 578 | block, sbi->s_itb_per_group); |
a107e5a3 | 579 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, GFP_NOFS); |
a31437b8 LC |
580 | if (err) |
581 | goto exit_bh; | |
c3e94d1d YY |
582 | ext4_set_bits(bh->b_data, input->inode_table - start, |
583 | sbi->s_itb_per_group); | |
14904107 | 584 | |
14904107 | 585 | |
61d08673 TT |
586 | ext4_mark_bitmap_end(input->blocks_count, sb->s_blocksize * 8, |
587 | bh->b_data); | |
b4097142 TT |
588 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
589 | if (unlikely(err)) { | |
590 | ext4_std_error(sb, err); | |
591 | goto exit_bh; | |
592 | } | |
ac27a0ec | 593 | brelse(bh); |
ac27a0ec | 594 | /* Mark unused entries in inode bitmap used */ |
c549a95d | 595 | ext4_debug("clear inode bitmap %#04llx (+%llu)\n", |
ac27a0ec DK |
596 | input->inode_bitmap, input->inode_bitmap - start); |
597 | if (IS_ERR(bh = bclean(handle, sb, input->inode_bitmap))) { | |
598 | err = PTR_ERR(bh); | |
599 | goto exit_journal; | |
600 | } | |
601 | ||
61d08673 TT |
602 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, |
603 | bh->b_data); | |
b4097142 TT |
604 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
605 | if (unlikely(err)) | |
606 | ext4_std_error(sb, err); | |
ac27a0ec DK |
607 | exit_bh: |
608 | brelse(bh); | |
609 | ||
610 | exit_journal: | |
617ba13b | 611 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
612 | err = err2; |
613 | ||
614 | return err; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 619 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
620 | * calling this for the first time. In a sparse filesystem it will be the |
621 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
622 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
623 | */ | |
617ba13b | 624 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
625 | unsigned *five, unsigned *seven) |
626 | { | |
627 | unsigned *min = three; | |
628 | int mult = 3; | |
629 | unsigned ret; | |
630 | ||
617ba13b MC |
631 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
632 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
633 | ret = *min; |
634 | *min += 1; | |
635 | return ret; | |
636 | } | |
637 | ||
638 | if (*five < *min) { | |
639 | min = five; | |
640 | mult = 5; | |
641 | } | |
642 | if (*seven < *min) { | |
643 | min = seven; | |
644 | mult = 7; | |
645 | } | |
646 | ||
647 | ret = *min; | |
648 | *min *= mult; | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
653 | /* | |
654 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
655 | * It is assumed that they are stored in group order. Returns the number of | |
656 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
657 | */ | |
658 | static int verify_reserved_gdb(struct super_block *sb, | |
659 | struct buffer_head *primary) | |
660 | { | |
617ba13b | 661 | const ext4_fsblk_t blk = primary->b_blocknr; |
fd2d4291 | 662 | const ext4_group_t end = EXT4_SB(sb)->s_groups_count; |
ac27a0ec DK |
663 | unsigned three = 1; |
664 | unsigned five = 5; | |
665 | unsigned seven = 7; | |
666 | unsigned grp; | |
667 | __le32 *p = (__le32 *)primary->b_data; | |
668 | int gdbackups = 0; | |
669 | ||
617ba13b | 670 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
671 | if (le32_to_cpu(*p++) != |
672 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 673 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 674 | " missing grp %d (%llu)", |
ac27a0ec | 675 | blk, grp, |
bd81d8ee LV |
676 | grp * |
677 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
678 | blk); | |
ac27a0ec DK |
679 | return -EINVAL; |
680 | } | |
617ba13b | 681 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
682 | return -EFBIG; |
683 | } | |
684 | ||
685 | return gdbackups; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Called when we need to bring a reserved group descriptor table block into | |
690 | * use from the resize inode. The primary copy of the new GDT block currently | |
691 | * is an indirect block (under the double indirect block in the resize inode). | |
692 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
693 | * block, in group order. Even though we know all the block numbers we need, | |
694 | * we check to ensure that the resize inode has actually reserved these blocks. | |
695 | * | |
696 | * Don't need to update the block bitmaps because the blocks are still in use. | |
697 | * | |
698 | * We get all of the error cases out of the way, so that we are sure to not | |
699 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
700 | */ | |
701 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 702 | ext4_group_t group) |
ac27a0ec DK |
703 | { |
704 | struct super_block *sb = inode->i_sb; | |
617ba13b | 705 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 706 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 707 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
708 | struct buffer_head **o_group_desc, **n_group_desc; |
709 | struct buffer_head *dind; | |
2f919710 | 710 | struct buffer_head *gdb_bh; |
ac27a0ec | 711 | int gdbackups; |
617ba13b | 712 | struct ext4_iloc iloc; |
ac27a0ec DK |
713 | __le32 *data; |
714 | int err; | |
715 | ||
716 | if (test_opt(sb, DEBUG)) | |
717 | printk(KERN_DEBUG | |
617ba13b | 718 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
719 | gdb_num); |
720 | ||
af5bc92d TT |
721 | /* |
722 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
723 | * because the user tools have no way of handling this. Probably a |
724 | * bad time to do it anyways. | |
725 | */ | |
617ba13b MC |
726 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
727 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 728 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 729 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
730 | return -EPERM; |
731 | } | |
732 | ||
2f919710 YY |
733 | gdb_bh = sb_bread(sb, gdblock); |
734 | if (!gdb_bh) | |
ac27a0ec DK |
735 | return -EIO; |
736 | ||
2f919710 YY |
737 | gdbackups = verify_reserved_gdb(sb, gdb_bh); |
738 | if (gdbackups < 0) { | |
ac27a0ec DK |
739 | err = gdbackups; |
740 | goto exit_bh; | |
741 | } | |
742 | ||
617ba13b | 743 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
744 | dind = sb_bread(sb, le32_to_cpu(*data)); |
745 | if (!dind) { | |
746 | err = -EIO; | |
747 | goto exit_bh; | |
748 | } | |
749 | ||
750 | data = (__le32 *)dind->b_data; | |
617ba13b | 751 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 752 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 753 | group, gdblock); |
ac27a0ec DK |
754 | err = -EINVAL; |
755 | goto exit_dind; | |
756 | } | |
757 | ||
b4097142 TT |
758 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
759 | if (unlikely(err)) | |
ac27a0ec DK |
760 | goto exit_dind; |
761 | ||
2f919710 | 762 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 763 | if (unlikely(err)) |
ac27a0ec DK |
764 | goto exit_sbh; |
765 | ||
b4097142 TT |
766 | err = ext4_journal_get_write_access(handle, dind); |
767 | if (unlikely(err)) | |
768 | ext4_std_error(sb, err); | |
ac27a0ec | 769 | |
617ba13b | 770 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
771 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
772 | if (unlikely(err)) | |
ac27a0ec DK |
773 | goto exit_dindj; |
774 | ||
f18a5f21 TT |
775 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
776 | sizeof(struct buffer_head *), | |
777 | GFP_NOFS); | |
ac27a0ec DK |
778 | if (!n_group_desc) { |
779 | err = -ENOMEM; | |
f18a5f21 TT |
780 | ext4_warning(sb, "not enough memory for %lu groups", |
781 | gdb_num + 1); | |
ac27a0ec DK |
782 | goto exit_inode; |
783 | } | |
784 | ||
785 | /* | |
786 | * Finally, we have all of the possible failures behind us... | |
787 | * | |
788 | * Remove new GDT block from inode double-indirect block and clear out | |
789 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
790 | * from the reserved inode). We don't need to change the bitmaps for | |
791 | * these blocks, because they are marked as in-use from being in the | |
792 | * reserved inode, and will become GDT blocks (primary and backup). | |
793 | */ | |
617ba13b | 794 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
795 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
796 | if (unlikely(err)) { | |
797 | ext4_std_error(sb, err); | |
798 | goto exit_inode; | |
799 | } | |
ac27a0ec | 800 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 801 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
802 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
803 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
804 | if (unlikely(err)) { |
805 | ext4_std_error(sb, err); | |
806 | goto exit_inode; | |
807 | } | |
808 | brelse(dind); | |
ac27a0ec | 809 | |
617ba13b | 810 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 811 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 812 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 813 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
814 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
815 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 816 | ext4_kvfree(o_group_desc); |
ac27a0ec | 817 | |
e8546d06 | 818 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b4097142 TT |
819 | err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
820 | if (err) | |
821 | ext4_std_error(sb, err); | |
ac27a0ec | 822 | |
b4097142 | 823 | return err; |
ac27a0ec DK |
824 | |
825 | exit_inode: | |
f18a5f21 | 826 | ext4_kvfree(n_group_desc); |
537a0310 | 827 | /* ext4_handle_release_buffer(handle, iloc.bh); */ |
ac27a0ec DK |
828 | brelse(iloc.bh); |
829 | exit_dindj: | |
537a0310 | 830 | /* ext4_handle_release_buffer(handle, dind); */ |
ac27a0ec | 831 | exit_sbh: |
537a0310 | 832 | /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ |
ac27a0ec DK |
833 | exit_dind: |
834 | brelse(dind); | |
835 | exit_bh: | |
2f919710 | 836 | brelse(gdb_bh); |
ac27a0ec | 837 | |
617ba13b | 838 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
839 | return err; |
840 | } | |
841 | ||
842 | /* | |
843 | * Called when we are adding a new group which has a backup copy of each of | |
844 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
845 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
846 | * that they are kept for future resizing and not allocated to files. | |
847 | * | |
848 | * Each reserved backup GDT block will go into a different indirect block. | |
849 | * The indirect blocks are actually the primary reserved GDT blocks, | |
850 | * so we know in advance what their block numbers are. We only get the | |
851 | * double-indirect block to verify it is pointing to the primary reserved | |
852 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
853 | * backup GDT blocks are stored in their reserved primary GDT block. | |
854 | */ | |
855 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 856 | ext4_group_t group) |
ac27a0ec DK |
857 | { |
858 | struct super_block *sb = inode->i_sb; | |
617ba13b | 859 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
860 | struct buffer_head **primary; |
861 | struct buffer_head *dind; | |
617ba13b MC |
862 | struct ext4_iloc iloc; |
863 | ext4_fsblk_t blk; | |
ac27a0ec DK |
864 | __le32 *data, *end; |
865 | int gdbackups = 0; | |
866 | int res, i; | |
867 | int err; | |
868 | ||
216553c4 | 869 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
870 | if (!primary) |
871 | return -ENOMEM; | |
872 | ||
617ba13b | 873 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
874 | dind = sb_bread(sb, le32_to_cpu(*data)); |
875 | if (!dind) { | |
876 | err = -EIO; | |
877 | goto exit_free; | |
878 | } | |
879 | ||
617ba13b | 880 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
881 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
882 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 883 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
884 | |
885 | /* Get each reserved primary GDT block and verify it holds backups */ | |
886 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
887 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 888 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
889 | " not at offset %ld", |
890 | blk, | |
891 | (long)(data - (__le32 *)dind->b_data)); | |
892 | err = -EINVAL; | |
893 | goto exit_bh; | |
894 | } | |
895 | primary[res] = sb_bread(sb, blk); | |
896 | if (!primary[res]) { | |
897 | err = -EIO; | |
898 | goto exit_bh; | |
899 | } | |
900 | if ((gdbackups = verify_reserved_gdb(sb, primary[res])) < 0) { | |
901 | brelse(primary[res]); | |
902 | err = gdbackups; | |
903 | goto exit_bh; | |
904 | } | |
905 | if (++data >= end) | |
906 | data = (__le32 *)dind->b_data; | |
907 | } | |
908 | ||
909 | for (i = 0; i < reserved_gdb; i++) { | |
617ba13b | 910 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) { |
ac27a0ec DK |
911 | /* |
912 | int j; | |
913 | for (j = 0; j < i; j++) | |
537a0310 | 914 | ext4_handle_release_buffer(handle, primary[j]); |
ac27a0ec DK |
915 | */ |
916 | goto exit_bh; | |
917 | } | |
918 | } | |
919 | ||
617ba13b | 920 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
921 | goto exit_bh; |
922 | ||
923 | /* | |
924 | * Finally we can add each of the reserved backup GDT blocks from | |
925 | * the new group to its reserved primary GDT block. | |
926 | */ | |
668f4dc5 | 927 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
928 | for (i = 0; i < reserved_gdb; i++) { |
929 | int err2; | |
930 | data = (__le32 *)primary[i]->b_data; | |
931 | /* printk("reserving backup %lu[%u] = %lu\n", | |
932 | primary[i]->b_blocknr, gdbackups, | |
933 | blk + primary[i]->b_blocknr); */ | |
934 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 935 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
936 | if (!err) |
937 | err = err2; | |
938 | } | |
939 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 940 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
941 | |
942 | exit_bh: | |
943 | while (--res >= 0) | |
944 | brelse(primary[res]); | |
945 | brelse(dind); | |
946 | ||
947 | exit_free: | |
948 | kfree(primary); | |
949 | ||
950 | return err; | |
951 | } | |
952 | ||
953 | /* | |
617ba13b | 954 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
955 | * of the main resize transaction, because e2fsck will re-write them if there |
956 | * is a problem (basically only OOM will cause a problem). However, we | |
957 | * _should_ update the backups if possible, in case the primary gets trashed | |
958 | * for some reason and we need to run e2fsck from a backup superblock. The | |
959 | * important part is that the new block and inode counts are in the backup | |
960 | * superblocks, and the location of the new group metadata in the GDT backups. | |
961 | * | |
32ed5058 TT |
962 | * We do not need take the s_resize_lock for this, because these |
963 | * blocks are not otherwise touched by the filesystem code when it is | |
964 | * mounted. We don't need to worry about last changing from | |
965 | * sbi->s_groups_count, because the worst that can happen is that we | |
966 | * do not copy the full number of backups at this time. The resize | |
967 | * which changed s_groups_count will backup again. | |
ac27a0ec DK |
968 | */ |
969 | static void update_backups(struct super_block *sb, | |
970 | int blk_off, char *data, int size) | |
971 | { | |
617ba13b | 972 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 973 | const ext4_group_t last = sbi->s_groups_count; |
617ba13b | 974 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
975 | unsigned three = 1; |
976 | unsigned five = 5; | |
977 | unsigned seven = 7; | |
fd2d4291 | 978 | ext4_group_t group; |
ac27a0ec DK |
979 | int rest = sb->s_blocksize - size; |
980 | handle_t *handle; | |
981 | int err = 0, err2; | |
982 | ||
617ba13b | 983 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
984 | if (IS_ERR(handle)) { |
985 | group = 1; | |
986 | err = PTR_ERR(handle); | |
987 | goto exit_err; | |
988 | } | |
989 | ||
617ba13b | 990 | while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { |
ac27a0ec DK |
991 | struct buffer_head *bh; |
992 | ||
993 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
994 | if (ext4_handle_valid(handle) && |
995 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
996 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
997 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
998 | break; |
999 | ||
1000 | bh = sb_getblk(sb, group * bpg + blk_off); | |
1001 | if (!bh) { | |
1002 | err = -EIO; | |
1003 | break; | |
1004 | } | |
617ba13b | 1005 | ext4_debug("update metadata backup %#04lx\n", |
ac27a0ec | 1006 | (unsigned long)bh->b_blocknr); |
617ba13b | 1007 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
1008 | break; |
1009 | lock_buffer(bh); | |
1010 | memcpy(bh->b_data, data, size); | |
1011 | if (rest) | |
1012 | memset(bh->b_data + size, 0, rest); | |
1013 | set_buffer_uptodate(bh); | |
1014 | unlock_buffer(bh); | |
b4097142 TT |
1015 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
1016 | if (unlikely(err)) | |
1017 | ext4_std_error(sb, err); | |
ac27a0ec DK |
1018 | brelse(bh); |
1019 | } | |
617ba13b | 1020 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1021 | err = err2; |
1022 | ||
1023 | /* | |
1024 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1025 | * late to revert the resize, we shouldn't fail just because of | |
1026 | * the backup copies (they are only needed in case of corruption). | |
1027 | * | |
1028 | * However, if we got here we have a journal problem too, so we | |
1029 | * can't really start a transaction to mark the superblock. | |
1030 | * Chicken out and just set the flag on the hope it will be written | |
1031 | * to disk, and if not - we will simply wait until next fsck. | |
1032 | */ | |
1033 | exit_err: | |
1034 | if (err) { | |
12062ddd | 1035 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1036 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1037 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1038 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1039 | mark_buffer_dirty(sbi->s_sbh); |
1040 | } | |
1041 | } | |
1042 | ||
bb08c1e7 YY |
1043 | /* |
1044 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1045 | * starting at @group | |
1046 | * | |
1047 | * @handle: journal handle | |
1048 | * @sb: super block | |
1049 | * @group: the group no. of the first group desc to be added | |
1050 | * @resize_inode: the resize inode | |
1051 | * @count: number of group descriptors to be added | |
1052 | */ | |
1053 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1054 | ext4_group_t group, struct inode *resize_inode, | |
1055 | ext4_group_t count) | |
1056 | { | |
1057 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1058 | struct ext4_super_block *es = sbi->s_es; | |
1059 | struct buffer_head *gdb_bh; | |
1060 | int i, gdb_off, gdb_num, err = 0; | |
1061 | ||
1062 | for (i = 0; i < count; i++, group++) { | |
1063 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1064 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1065 | ||
1066 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1067 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1068 | ||
1069 | /* | |
1070 | * We will only either add reserved group blocks to a backup group | |
1071 | * or remove reserved blocks for the first group in a new group block. | |
1072 | * Doing both would be mean more complex code, and sane people don't | |
1073 | * use non-sparse filesystems anymore. This is already checked above. | |
1074 | */ | |
1075 | if (gdb_off) { | |
1076 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1077 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1078 | ||
1079 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1080 | err = reserve_backup_gdb(handle, resize_inode, group); | |
1081 | } else | |
1082 | err = add_new_gdb(handle, resize_inode, group); | |
1083 | if (err) | |
1084 | break; | |
1085 | } | |
1086 | return err; | |
1087 | } | |
1088 | ||
083f5b24 YY |
1089 | /* |
1090 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1091 | */ | |
1092 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1093 | struct ext4_new_flex_group_data *flex_gd) | |
1094 | { | |
1095 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1096 | struct ext4_group_desc *gdp; | |
1097 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1098 | struct buffer_head *gdb_bh; | |
1099 | ext4_group_t group; | |
1100 | __u16 *bg_flags = flex_gd->bg_flags; | |
1101 | int i, gdb_off, gdb_num, err = 0; | |
1102 | ||
1103 | ||
1104 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1105 | group = group_data->group; | |
1106 | ||
1107 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1108 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1109 | ||
1110 | /* | |
1111 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1112 | */ | |
1113 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1114 | /* Update group descriptor block for new group */ | |
1115 | gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data + | |
1116 | gdb_off * EXT4_DESC_SIZE(sb)); | |
1117 | ||
1118 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1119 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1120 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
1121 | ext4_inode_table_set(sb, gdp, group_data->inode_table); | |
1122 | ext4_free_group_clusters_set(sb, gdp, | |
1123 | EXT4_B2C(sbi, group_data->free_blocks_count)); | |
1124 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); | |
1125 | gdp->bg_flags = cpu_to_le16(*bg_flags); | |
1126 | gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); | |
1127 | ||
1128 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1129 | if (unlikely(err)) { | |
1130 | ext4_std_error(sb, err); | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * We can allocate memory for mb_alloc based on the new group | |
1136 | * descriptor | |
1137 | */ | |
1138 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1139 | if (err) | |
1140 | break; | |
1141 | } | |
1142 | return err; | |
1143 | } | |
1144 | ||
2e10e2f2 YY |
1145 | /* |
1146 | * ext4_update_super() updates the super block so that the newly added | |
1147 | * groups can be seen by the filesystem. | |
1148 | * | |
1149 | * @sb: super block | |
1150 | * @flex_gd: new added groups | |
1151 | */ | |
1152 | static void ext4_update_super(struct super_block *sb, | |
1153 | struct ext4_new_flex_group_data *flex_gd) | |
1154 | { | |
1155 | ext4_fsblk_t blocks_count = 0; | |
1156 | ext4_fsblk_t free_blocks = 0; | |
1157 | ext4_fsblk_t reserved_blocks = 0; | |
1158 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1159 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1160 | struct ext4_super_block *es = sbi->s_es; | |
1161 | int i; | |
1162 | ||
1163 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1164 | /* | |
1165 | * Make the new blocks and inodes valid next. We do this before | |
1166 | * increasing the group count so that once the group is enabled, | |
1167 | * all of its blocks and inodes are already valid. | |
1168 | * | |
1169 | * We always allocate group-by-group, then block-by-block or | |
1170 | * inode-by-inode within a group, so enabling these | |
1171 | * blocks/inodes before the group is live won't actually let us | |
1172 | * allocate the new space yet. | |
1173 | */ | |
1174 | for (i = 0; i < flex_gd->count; i++) { | |
1175 | blocks_count += group_data[i].blocks_count; | |
1176 | free_blocks += group_data[i].free_blocks_count; | |
1177 | } | |
1178 | ||
1179 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
1180 | do_div(reserved_blocks, ext4_blocks_count(es)); | |
1181 | reserved_blocks *= blocks_count; | |
1182 | do_div(reserved_blocks, 100); | |
1183 | ||
1184 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
1185 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * | |
1186 | flex_gd->count); | |
1187 | ||
1188 | /* | |
1189 | * We need to protect s_groups_count against other CPUs seeing | |
1190 | * inconsistent state in the superblock. | |
1191 | * | |
1192 | * The precise rules we use are: | |
1193 | * | |
1194 | * * Writers must perform a smp_wmb() after updating all | |
1195 | * dependent data and before modifying the groups count | |
1196 | * | |
1197 | * * Readers must perform an smp_rmb() after reading the groups | |
1198 | * count and before reading any dependent data. | |
1199 | * | |
1200 | * NB. These rules can be relaxed when checking the group count | |
1201 | * while freeing data, as we can only allocate from a block | |
1202 | * group after serialising against the group count, and we can | |
1203 | * only then free after serialising in turn against that | |
1204 | * allocation. | |
1205 | */ | |
1206 | smp_wmb(); | |
1207 | ||
1208 | /* Update the global fs size fields */ | |
1209 | sbi->s_groups_count += flex_gd->count; | |
1210 | ||
1211 | /* Update the reserved block counts only once the new group is | |
1212 | * active. */ | |
1213 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1214 | reserved_blocks); | |
1215 | ||
1216 | /* Update the free space counts */ | |
1217 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
1218 | EXT4_B2C(sbi, free_blocks)); | |
1219 | percpu_counter_add(&sbi->s_freeinodes_counter, | |
1220 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1221 | ||
1222 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, | |
1223 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1224 | sbi->s_log_groups_per_flex) { | |
1225 | ext4_group_t flex_group; | |
1226 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
1227 | atomic_add(EXT4_B2C(sbi, free_blocks), | |
1228 | &sbi->s_flex_groups[flex_group].free_clusters); | |
1229 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, | |
1230 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1231 | } | |
1232 | ||
1233 | if (test_opt(sb, DEBUG)) | |
1234 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1235 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1236 | blocks_count, free_blocks, reserved_blocks); | |
1237 | } | |
1238 | ||
ac27a0ec DK |
1239 | /* Add group descriptor data to an existing or new group descriptor block. |
1240 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1241 | * the filesystem, because we cannot abort the transaction and not have it | |
1242 | * write the data to disk. | |
1243 | * | |
1244 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1245 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1246 | * | |
1247 | * We only need to hold the superblock lock while we are actually adding | |
1248 | * in the new group's counts to the superblock. Prior to that we have | |
1249 | * not really "added" the group at all. We re-check that we are still | |
1250 | * adding in the last group in case things have changed since verifying. | |
1251 | */ | |
617ba13b | 1252 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1253 | { |
617ba13b MC |
1254 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1255 | struct ext4_super_block *es = sbi->s_es; | |
1256 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec DK |
1257 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
1258 | struct buffer_head *primary = NULL; | |
617ba13b | 1259 | struct ext4_group_desc *gdp; |
ac27a0ec DK |
1260 | struct inode *inode = NULL; |
1261 | handle_t *handle; | |
1262 | int gdb_off, gdb_num; | |
1263 | int err, err2; | |
1264 | ||
617ba13b MC |
1265 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
1266 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 1267 | |
617ba13b MC |
1268 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1269 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1270 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1271 | return -EPERM; |
1272 | } | |
1273 | ||
bd81d8ee LV |
1274 | if (ext4_blocks_count(es) + input->blocks_count < |
1275 | ext4_blocks_count(es)) { | |
12062ddd | 1276 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1277 | return -EINVAL; |
1278 | } | |
1279 | ||
617ba13b | 1280 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1281 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1282 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1283 | return -EINVAL; |
1284 | } | |
1285 | ||
1286 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1287 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1288 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1289 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1290 | ext4_warning(sb, |
ac27a0ec DK |
1291 | "No reserved GDT blocks, can't resize"); |
1292 | return -EPERM; | |
1293 | } | |
1d1fe1ee DH |
1294 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1295 | if (IS_ERR(inode)) { | |
12062ddd | 1296 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1297 | return PTR_ERR(inode); |
ac27a0ec DK |
1298 | } |
1299 | } | |
1300 | ||
920313a7 | 1301 | |
ac27a0ec DK |
1302 | if ((err = verify_group_input(sb, input))) |
1303 | goto exit_put; | |
1304 | ||
1305 | if ((err = setup_new_group_blocks(sb, input))) | |
1306 | goto exit_put; | |
1307 | ||
1308 | /* | |
1309 | * We will always be modifying at least the superblock and a GDT | |
1310 | * block. If we are adding a group past the last current GDT block, | |
1311 | * we will also modify the inode and the dindirect block. If we | |
1312 | * are adding a group with superblock/GDT backups we will also | |
1313 | * modify each of the reserved GDT dindirect blocks. | |
1314 | */ | |
617ba13b MC |
1315 | handle = ext4_journal_start_sb(sb, |
1316 | ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec DK |
1317 | 3 + reserved_gdb : 4); |
1318 | if (IS_ERR(handle)) { | |
1319 | err = PTR_ERR(handle); | |
1320 | goto exit_put; | |
1321 | } | |
1322 | ||
617ba13b | 1323 | if ((err = ext4_journal_get_write_access(handle, sbi->s_sbh))) |
ac27a0ec DK |
1324 | goto exit_journal; |
1325 | ||
2b2d6d01 TT |
1326 | /* |
1327 | * We will only either add reserved group blocks to a backup group | |
1328 | * or remove reserved blocks for the first group in a new group block. | |
1329 | * Doing both would be mean more complex code, and sane people don't | |
1330 | * use non-sparse filesystems anymore. This is already checked above. | |
1331 | */ | |
ac27a0ec DK |
1332 | if (gdb_off) { |
1333 | primary = sbi->s_group_desc[gdb_num]; | |
617ba13b | 1334 | if ((err = ext4_journal_get_write_access(handle, primary))) |
ac27a0ec DK |
1335 | goto exit_journal; |
1336 | ||
668f4dc5 YY |
1337 | if (reserved_gdb && ext4_bg_num_gdb(sb, input->group)) { |
1338 | err = reserve_backup_gdb(handle, inode, input->group); | |
1339 | if (err) | |
1340 | goto exit_journal; | |
1341 | } | |
2f919710 YY |
1342 | } else { |
1343 | /* | |
1344 | * Note that we can access new group descriptor block safely | |
1345 | * only if add_new_gdb() succeeds. | |
1346 | */ | |
1347 | err = add_new_gdb(handle, inode, input->group); | |
1348 | if (err) | |
1349 | goto exit_journal; | |
1350 | primary = sbi->s_group_desc[gdb_num]; | |
1351 | } | |
ac27a0ec | 1352 | |
2b2d6d01 TT |
1353 | /* |
1354 | * OK, now we've set up the new group. Time to make it active. | |
1355 | * | |
2b2d6d01 TT |
1356 | * so we have to be safe wrt. concurrent accesses the group |
1357 | * data. So we need to be careful to set all of the relevant | |
1358 | * group descriptor data etc. *before* we enable the group. | |
1359 | * | |
1360 | * The key field here is sbi->s_groups_count: as long as | |
1361 | * that retains its old value, nobody is going to access the new | |
1362 | * group. | |
1363 | * | |
1364 | * So first we update all the descriptor metadata for the new | |
1365 | * group; then we update the total disk blocks count; then we | |
1366 | * update the groups count to enable the group; then finally we | |
1367 | * update the free space counts so that the system can start | |
1368 | * using the new disk blocks. | |
1369 | */ | |
ac27a0ec DK |
1370 | |
1371 | /* Update group descriptor block for new group */ | |
2856922c FB |
1372 | gdp = (struct ext4_group_desc *)((char *)primary->b_data + |
1373 | gdb_off * EXT4_DESC_SIZE(sb)); | |
ac27a0ec | 1374 | |
fdff73f0 | 1375 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); |
8fadc143 AR |
1376 | ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */ |
1377 | ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */ | |
1378 | ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */ | |
021b65bb | 1379 | ext4_free_group_clusters_set(sb, gdp, input->free_blocks_count); |
560671a0 | 1380 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); |
fdff73f0 | 1381 | gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED); |
717d50e4 | 1382 | gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp); |
ac27a0ec | 1383 | |
5f21b0e6 FB |
1384 | /* |
1385 | * We can allocate memory for mb_alloc based on the new group | |
1386 | * descriptor | |
1387 | */ | |
920313a7 | 1388 | err = ext4_mb_add_groupinfo(sb, input->group, gdp); |
08c3a813 | 1389 | if (err) |
c2ea3fde TT |
1390 | goto exit_journal; |
1391 | ||
ac27a0ec DK |
1392 | /* |
1393 | * Make the new blocks and inodes valid next. We do this before | |
1394 | * increasing the group count so that once the group is enabled, | |
1395 | * all of its blocks and inodes are already valid. | |
1396 | * | |
1397 | * We always allocate group-by-group, then block-by-block or | |
1398 | * inode-by-inode within a group, so enabling these | |
1399 | * blocks/inodes before the group is live won't actually let us | |
1400 | * allocate the new space yet. | |
1401 | */ | |
bd81d8ee | 1402 | ext4_blocks_count_set(es, ext4_blocks_count(es) + |
ac27a0ec | 1403 | input->blocks_count); |
e8546d06 | 1404 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb)); |
ac27a0ec DK |
1405 | |
1406 | /* | |
1407 | * We need to protect s_groups_count against other CPUs seeing | |
1408 | * inconsistent state in the superblock. | |
1409 | * | |
1410 | * The precise rules we use are: | |
1411 | * | |
ac27a0ec DK |
1412 | * * Writers must perform a smp_wmb() after updating all dependent |
1413 | * data and before modifying the groups count | |
1414 | * | |
ac27a0ec DK |
1415 | * * Readers must perform an smp_rmb() after reading the groups count |
1416 | * and before reading any dependent data. | |
1417 | * | |
1418 | * NB. These rules can be relaxed when checking the group count | |
1419 | * while freeing data, as we can only allocate from a block | |
1420 | * group after serialising against the group count, and we can | |
1421 | * only then free after serialising in turn against that | |
1422 | * allocation. | |
1423 | */ | |
1424 | smp_wmb(); | |
1425 | ||
1426 | /* Update the global fs size fields */ | |
1427 | sbi->s_groups_count++; | |
1428 | ||
b4097142 TT |
1429 | err = ext4_handle_dirty_metadata(handle, NULL, primary); |
1430 | if (unlikely(err)) { | |
1431 | ext4_std_error(sb, err); | |
1432 | goto exit_journal; | |
1433 | } | |
ac27a0ec DK |
1434 | |
1435 | /* Update the reserved block counts only once the new group is | |
1436 | * active. */ | |
bd81d8ee | 1437 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + |
ac27a0ec DK |
1438 | input->reserved_blocks); |
1439 | ||
1440 | /* Update the free space counts */ | |
57042651 TT |
1441 | percpu_counter_add(&sbi->s_freeclusters_counter, |
1442 | EXT4_B2C(sbi, input->free_blocks_count)); | |
aa0dff2d | 1443 | percpu_counter_add(&sbi->s_freeinodes_counter, |
617ba13b | 1444 | EXT4_INODES_PER_GROUP(sb)); |
ac27a0ec | 1445 | |
42007efd ES |
1446 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && |
1447 | sbi->s_log_groups_per_flex) { | |
c62a11fd FB |
1448 | ext4_group_t flex_group; |
1449 | flex_group = ext4_flex_group(sbi, input->group); | |
24aaa8ef TT |
1450 | atomic_add(EXT4_B2C(sbi, input->free_blocks_count), |
1451 | &sbi->s_flex_groups[flex_group].free_clusters); | |
9f24e420 TT |
1452 | atomic_add(EXT4_INODES_PER_GROUP(sb), |
1453 | &sbi->s_flex_groups[flex_group].free_inodes); | |
c62a11fd FB |
1454 | } |
1455 | ||
a0375156 | 1456 | ext4_handle_dirty_super(handle, sb); |
ac27a0ec DK |
1457 | |
1458 | exit_journal: | |
617ba13b | 1459 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec | 1460 | err = err2; |
2f919710 | 1461 | if (!err && primary) { |
ac27a0ec | 1462 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, |
617ba13b | 1463 | sizeof(struct ext4_super_block)); |
ac27a0ec DK |
1464 | update_backups(sb, primary->b_blocknr, primary->b_data, |
1465 | primary->b_size); | |
1466 | } | |
1467 | exit_put: | |
1468 | iput(inode); | |
1469 | return err; | |
617ba13b | 1470 | } /* ext4_group_add */ |
ac27a0ec | 1471 | |
18e31438 YY |
1472 | /* |
1473 | * extend a group without checking assuming that checking has been done. | |
1474 | */ | |
1475 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1476 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1477 | { | |
1478 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1479 | handle_t *handle; | |
1480 | int err = 0, err2; | |
1481 | ||
1482 | /* We will update the superblock, one block bitmap, and | |
1483 | * one group descriptor via ext4_group_add_blocks(). | |
1484 | */ | |
1485 | handle = ext4_journal_start_sb(sb, 3); | |
1486 | if (IS_ERR(handle)) { | |
1487 | err = PTR_ERR(handle); | |
1488 | ext4_warning(sb, "error %d on journal start", err); | |
1489 | return err; | |
1490 | } | |
1491 | ||
1492 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1493 | if (err) { | |
1494 | ext4_warning(sb, "error %d on journal write access", err); | |
1495 | goto errout; | |
1496 | } | |
1497 | ||
1498 | ext4_blocks_count_set(es, o_blocks_count + add); | |
1499 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, | |
1500 | o_blocks_count + add); | |
1501 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1502 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1503 | if (err) | |
1504 | goto errout; | |
1505 | ext4_handle_dirty_super(handle, sb); | |
1506 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1507 | o_blocks_count + add); | |
1508 | errout: | |
1509 | err2 = ext4_journal_stop(handle); | |
1510 | if (err2 && !err) | |
1511 | err = err2; | |
1512 | ||
1513 | if (!err) { | |
1514 | if (test_opt(sb, DEBUG)) | |
1515 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1516 | "blocks\n", ext4_blocks_count(es)); | |
1517 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, | |
1518 | sizeof(struct ext4_super_block)); | |
1519 | } | |
1520 | return err; | |
1521 | } | |
1522 | ||
2b2d6d01 TT |
1523 | /* |
1524 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1525 | * point is only used to extend the current filesystem to the end of the last |
1526 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1527 | * for emergencies (because it has no dependencies on reserved blocks). | |
1528 | * | |
617ba13b | 1529 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1530 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1531 | * GDT blocks are reserved to grow to the desired size. | |
1532 | */ | |
617ba13b MC |
1533 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1534 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1535 | { |
617ba13b | 1536 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1537 | ext4_grpblk_t last; |
1538 | ext4_grpblk_t add; | |
af5bc92d | 1539 | struct buffer_head *bh; |
ac27a0ec | 1540 | handle_t *handle; |
cc7365df | 1541 | int err, err2; |
5f21b0e6 | 1542 | ext4_group_t group; |
ac27a0ec | 1543 | |
bd81d8ee | 1544 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1545 | |
1546 | if (test_opt(sb, DEBUG)) | |
2b79b09d | 1547 | printk(KERN_DEBUG "EXT4-fs: extending last group from %llu to %llu blocks\n", |
ac27a0ec DK |
1548 | o_blocks_count, n_blocks_count); |
1549 | ||
1550 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1551 | return 0; | |
1552 | ||
1553 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
617ba13b | 1554 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
2ae02107 | 1555 | " too large to resize to %llu blocks safely\n", |
ac27a0ec DK |
1556 | sb->s_id, n_blocks_count); |
1557 | if (sizeof(sector_t) < 8) | |
12062ddd | 1558 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1559 | return -EINVAL; |
1560 | } | |
1561 | ||
1562 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1563 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1564 | return -EINVAL; |
ac27a0ec DK |
1565 | } |
1566 | ||
1567 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1568 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1569 | |
1570 | if (last == 0) { | |
12062ddd | 1571 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1572 | return -EPERM; |
1573 | } | |
1574 | ||
617ba13b | 1575 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1576 | |
1577 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1578 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1579 | return -EINVAL; |
1580 | } | |
1581 | ||
1582 | if (o_blocks_count + add > n_blocks_count) | |
1583 | add = n_blocks_count - o_blocks_count; | |
1584 | ||
1585 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1586 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1587 | o_blocks_count + add, add); |
1588 | ||
1589 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1590 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1591 | if (!bh) { |
12062ddd | 1592 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1593 | return -ENOSPC; |
1594 | } | |
1595 | brelse(bh); | |
1596 | ||
1597 | /* We will update the superblock, one block bitmap, and | |
617ba13b | 1598 | * one group descriptor via ext4_free_blocks(). |
ac27a0ec | 1599 | */ |
617ba13b | 1600 | handle = ext4_journal_start_sb(sb, 3); |
ac27a0ec DK |
1601 | if (IS_ERR(handle)) { |
1602 | err = PTR_ERR(handle); | |
12062ddd | 1603 | ext4_warning(sb, "error %d on journal start", err); |
ac27a0ec DK |
1604 | goto exit_put; |
1605 | } | |
1606 | ||
617ba13b MC |
1607 | if ((err = ext4_journal_get_write_access(handle, |
1608 | EXT4_SB(sb)->s_sbh))) { | |
12062ddd | 1609 | ext4_warning(sb, "error %d on journal write access", err); |
617ba13b | 1610 | ext4_journal_stop(handle); |
ac27a0ec DK |
1611 | goto exit_put; |
1612 | } | |
bd81d8ee | 1613 | ext4_blocks_count_set(es, o_blocks_count + add); |
c549a95d | 1614 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
ac27a0ec | 1615 | o_blocks_count + add); |
e21675d4 | 1616 | /* We add the blocks to the bitmap and set the group need init bit */ |
cc7365df | 1617 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); |
a0375156 | 1618 | ext4_handle_dirty_super(handle, sb); |
2ae02107 | 1619 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, |
ac27a0ec | 1620 | o_blocks_count + add); |
cc7365df YY |
1621 | err2 = ext4_journal_stop(handle); |
1622 | if (!err && err2) | |
1623 | err = err2; | |
1624 | ||
1625 | if (err) | |
ac27a0ec | 1626 | goto exit_put; |
5f21b0e6 | 1627 | |
ac27a0ec | 1628 | if (test_opt(sb, DEBUG)) |
bd81d8ee LV |
1629 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu blocks\n", |
1630 | ext4_blocks_count(es)); | |
617ba13b MC |
1631 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, |
1632 | sizeof(struct ext4_super_block)); | |
ac27a0ec DK |
1633 | exit_put: |
1634 | return err; | |
617ba13b | 1635 | } /* ext4_group_extend */ |