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