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 | ||
3fbea4b3 YY |
192 | /* |
193 | * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps | |
194 | * and inode tables for a flex group. | |
195 | * | |
196 | * This function is used by 64bit-resize. Note that this function allocates | |
197 | * group tables from the 1st group of groups contained by @flexgd, which may | |
198 | * be a partial of a flex group. | |
199 | * | |
200 | * @sb: super block of fs to which the groups belongs | |
201 | */ | |
202 | static void ext4_alloc_group_tables(struct super_block *sb, | |
203 | struct ext4_new_flex_group_data *flex_gd, | |
204 | int flexbg_size) | |
205 | { | |
206 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
207 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
208 | ext4_fsblk_t start_blk; | |
209 | ext4_fsblk_t last_blk; | |
210 | ext4_group_t src_group; | |
211 | ext4_group_t bb_index = 0; | |
212 | ext4_group_t ib_index = 0; | |
213 | ext4_group_t it_index = 0; | |
214 | ext4_group_t group; | |
215 | ext4_group_t last_group; | |
216 | unsigned overhead; | |
217 | ||
218 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
219 | ||
220 | src_group = group_data[0].group; | |
221 | last_group = src_group + flex_gd->count - 1; | |
222 | ||
223 | BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) != | |
224 | (last_group & ~(flexbg_size - 1)))); | |
225 | next_group: | |
226 | group = group_data[0].group; | |
227 | start_blk = ext4_group_first_block_no(sb, src_group); | |
228 | last_blk = start_blk + group_data[src_group - group].blocks_count; | |
229 | ||
230 | overhead = ext4_bg_has_super(sb, src_group) ? | |
231 | (1 + ext4_bg_num_gdb(sb, src_group) + | |
232 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
233 | ||
234 | start_blk += overhead; | |
235 | ||
236 | BUG_ON(src_group >= group_data[0].group + flex_gd->count); | |
237 | /* We collect contiguous blocks as much as possible. */ | |
238 | src_group++; | |
239 | for (; src_group <= last_group; src_group++) | |
240 | if (!ext4_bg_has_super(sb, src_group)) | |
241 | last_blk += group_data[src_group - group].blocks_count; | |
242 | else | |
243 | break; | |
244 | ||
245 | /* Allocate block bitmaps */ | |
246 | for (; bb_index < flex_gd->count; bb_index++) { | |
247 | if (start_blk >= last_blk) | |
248 | goto next_group; | |
249 | group_data[bb_index].block_bitmap = start_blk++; | |
250 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
251 | group -= group_data[0].group; | |
252 | group_data[group].free_blocks_count--; | |
253 | if (flexbg_size > 1) | |
254 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
255 | } | |
256 | ||
257 | /* Allocate inode bitmaps */ | |
258 | for (; ib_index < flex_gd->count; ib_index++) { | |
259 | if (start_blk >= last_blk) | |
260 | goto next_group; | |
261 | group_data[ib_index].inode_bitmap = start_blk++; | |
262 | ext4_get_group_no_and_offset(sb, start_blk - 1, &group, NULL); | |
263 | group -= group_data[0].group; | |
264 | group_data[group].free_blocks_count--; | |
265 | if (flexbg_size > 1) | |
266 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
267 | } | |
268 | ||
269 | /* Allocate inode tables */ | |
270 | for (; it_index < flex_gd->count; it_index++) { | |
271 | if (start_blk + EXT4_SB(sb)->s_itb_per_group > last_blk) | |
272 | goto next_group; | |
273 | group_data[it_index].inode_table = start_blk; | |
274 | ext4_get_group_no_and_offset(sb, start_blk, &group, NULL); | |
275 | group -= group_data[0].group; | |
276 | group_data[group].free_blocks_count -= | |
277 | EXT4_SB(sb)->s_itb_per_group; | |
278 | if (flexbg_size > 1) | |
279 | flex_gd->bg_flags[group] &= ~EXT4_BG_BLOCK_UNINIT; | |
280 | ||
281 | start_blk += EXT4_SB(sb)->s_itb_per_group; | |
282 | } | |
283 | ||
284 | if (test_opt(sb, DEBUG)) { | |
285 | int i; | |
286 | group = group_data[0].group; | |
287 | ||
288 | printk(KERN_DEBUG "EXT4-fs: adding a flex group with " | |
289 | "%d groups, flexbg size is %d:\n", flex_gd->count, | |
290 | flexbg_size); | |
291 | ||
292 | for (i = 0; i < flex_gd->count; i++) { | |
293 | printk(KERN_DEBUG "adding %s group %u: %u " | |
294 | "blocks (%d free)\n", | |
295 | ext4_bg_has_super(sb, group + i) ? "normal" : | |
296 | "no-super", group + i, | |
297 | group_data[i].blocks_count, | |
298 | group_data[i].free_blocks_count); | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
ac27a0ec | 303 | static struct buffer_head *bclean(handle_t *handle, struct super_block *sb, |
617ba13b | 304 | ext4_fsblk_t blk) |
ac27a0ec DK |
305 | { |
306 | struct buffer_head *bh; | |
307 | int err; | |
308 | ||
309 | bh = sb_getblk(sb, blk); | |
310 | if (!bh) | |
311 | return ERR_PTR(-EIO); | |
617ba13b | 312 | if ((err = ext4_journal_get_write_access(handle, bh))) { |
ac27a0ec DK |
313 | brelse(bh); |
314 | bh = ERR_PTR(err); | |
315 | } else { | |
ac27a0ec DK |
316 | memset(bh->b_data, 0, sb->s_blocksize); |
317 | set_buffer_uptodate(bh); | |
ac27a0ec DK |
318 | } |
319 | ||
320 | return bh; | |
321 | } | |
322 | ||
14904107 ES |
323 | /* |
324 | * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA. | |
325 | * If that fails, restart the transaction & regain write access for the | |
326 | * buffer head which is used for block_bitmap modifications. | |
327 | */ | |
6d40bc5a | 328 | static int extend_or_restart_transaction(handle_t *handle, int thresh) |
14904107 ES |
329 | { |
330 | int err; | |
331 | ||
0390131b | 332 | if (ext4_handle_has_enough_credits(handle, thresh)) |
14904107 ES |
333 | return 0; |
334 | ||
335 | err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA); | |
336 | if (err < 0) | |
337 | return err; | |
338 | if (err) { | |
6d40bc5a YY |
339 | err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA); |
340 | if (err) | |
14904107 | 341 | return err; |
2b2d6d01 | 342 | } |
14904107 ES |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
33afdcc5 YY |
347 | /* |
348 | * set_flexbg_block_bitmap() mark @count blocks starting from @block used. | |
349 | * | |
350 | * Helper function for ext4_setup_new_group_blocks() which set . | |
351 | * | |
352 | * @sb: super block | |
353 | * @handle: journal handle | |
354 | * @flex_gd: flex group data | |
355 | */ | |
356 | static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, | |
357 | struct ext4_new_flex_group_data *flex_gd, | |
358 | ext4_fsblk_t block, ext4_group_t count) | |
359 | { | |
360 | ext4_group_t count2; | |
361 | ||
362 | ext4_debug("mark blocks [%llu/%u] used\n", block, count); | |
363 | for (count2 = count; count > 0; count -= count2, block += count2) { | |
364 | ext4_fsblk_t start; | |
365 | struct buffer_head *bh; | |
366 | ext4_group_t group; | |
367 | int err; | |
368 | ||
369 | ext4_get_group_no_and_offset(sb, block, &group, NULL); | |
370 | start = ext4_group_first_block_no(sb, group); | |
371 | group -= flex_gd->groups[0].group; | |
372 | ||
373 | count2 = sb->s_blocksize * 8 - (block - start); | |
374 | if (count2 > count) | |
375 | count2 = count; | |
376 | ||
377 | if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) { | |
378 | BUG_ON(flex_gd->count > 1); | |
379 | continue; | |
380 | } | |
381 | ||
382 | err = extend_or_restart_transaction(handle, 1); | |
383 | if (err) | |
384 | return err; | |
385 | ||
386 | bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap); | |
387 | if (!bh) | |
388 | return -EIO; | |
389 | ||
390 | err = ext4_journal_get_write_access(handle, bh); | |
391 | if (err) | |
392 | return err; | |
393 | ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block, | |
394 | block - start, count2); | |
395 | ext4_set_bits(bh->b_data, block - start, count2); | |
396 | ||
397 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
398 | if (unlikely(err)) | |
399 | return err; | |
400 | brelse(bh); | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /* | |
407 | * Set up the block and inode bitmaps, and the inode table for the new groups. | |
408 | * This doesn't need to be part of the main transaction, since we are only | |
409 | * changing blocks outside the actual filesystem. We still do journaling to | |
410 | * ensure the recovery is correct in case of a failure just after resize. | |
411 | * If any part of this fails, we simply abort the resize. | |
412 | * | |
413 | * setup_new_flex_group_blocks handles a flex group as follow: | |
414 | * 1. copy super block and GDT, and initialize group tables if necessary. | |
415 | * In this step, we only set bits in blocks bitmaps for blocks taken by | |
416 | * super block and GDT. | |
417 | * 2. allocate group tables in block bitmaps, that is, set bits in block | |
418 | * bitmap for blocks taken by group tables. | |
419 | */ | |
420 | static int setup_new_flex_group_blocks(struct super_block *sb, | |
421 | struct ext4_new_flex_group_data *flex_gd) | |
422 | { | |
423 | int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group}; | |
424 | ext4_fsblk_t start; | |
425 | ext4_fsblk_t block; | |
426 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
427 | struct ext4_super_block *es = sbi->s_es; | |
428 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
429 | __u16 *bg_flags = flex_gd->bg_flags; | |
430 | handle_t *handle; | |
431 | ext4_group_t group, count; | |
432 | struct buffer_head *bh = NULL; | |
433 | int reserved_gdb, i, j, err = 0, err2; | |
434 | ||
435 | BUG_ON(!flex_gd->count || !group_data || | |
436 | group_data[0].group != sbi->s_groups_count); | |
437 | ||
438 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
439 | ||
440 | /* This transaction may be extended/restarted along the way */ | |
441 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); | |
442 | if (IS_ERR(handle)) | |
443 | return PTR_ERR(handle); | |
444 | ||
445 | group = group_data[0].group; | |
446 | for (i = 0; i < flex_gd->count; i++, group++) { | |
447 | unsigned long gdblocks; | |
448 | ||
449 | gdblocks = ext4_bg_num_gdb(sb, group); | |
450 | start = ext4_group_first_block_no(sb, group); | |
451 | ||
452 | /* Copy all of the GDT blocks into the backup in this group */ | |
453 | for (j = 0, block = start + 1; j < gdblocks; j++, block++) { | |
454 | struct buffer_head *gdb; | |
455 | ||
456 | ext4_debug("update backup group %#04llx\n", block); | |
457 | err = extend_or_restart_transaction(handle, 1); | |
458 | if (err) | |
459 | goto out; | |
460 | ||
461 | gdb = sb_getblk(sb, block); | |
462 | if (!gdb) { | |
463 | err = -EIO; | |
464 | goto out; | |
465 | } | |
466 | ||
467 | err = ext4_journal_get_write_access(handle, gdb); | |
468 | if (err) { | |
469 | brelse(gdb); | |
470 | goto out; | |
471 | } | |
472 | memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data, | |
473 | gdb->b_size); | |
474 | set_buffer_uptodate(gdb); | |
475 | ||
476 | err = ext4_handle_dirty_metadata(handle, NULL, gdb); | |
477 | if (unlikely(err)) { | |
478 | brelse(gdb); | |
479 | goto out; | |
480 | } | |
481 | brelse(gdb); | |
482 | } | |
483 | ||
484 | /* Zero out all of the reserved backup group descriptor | |
485 | * table blocks | |
486 | */ | |
487 | if (ext4_bg_has_super(sb, group)) { | |
488 | err = sb_issue_zeroout(sb, gdblocks + start + 1, | |
489 | reserved_gdb, GFP_NOFS); | |
490 | if (err) | |
491 | goto out; | |
492 | } | |
493 | ||
494 | /* Initialize group tables of the grop @group */ | |
495 | if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED)) | |
496 | goto handle_bb; | |
497 | ||
498 | /* Zero out all of the inode table blocks */ | |
499 | block = group_data[i].inode_table; | |
500 | ext4_debug("clear inode table blocks %#04llx -> %#04lx\n", | |
501 | block, sbi->s_itb_per_group); | |
502 | err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group, | |
503 | GFP_NOFS); | |
504 | if (err) | |
505 | goto out; | |
506 | ||
507 | handle_bb: | |
508 | if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT) | |
509 | goto handle_ib; | |
510 | ||
511 | /* Initialize block bitmap of the @group */ | |
512 | block = group_data[i].block_bitmap; | |
513 | err = extend_or_restart_transaction(handle, 1); | |
514 | if (err) | |
515 | goto out; | |
516 | ||
517 | bh = bclean(handle, sb, block); | |
518 | if (IS_ERR(bh)) { | |
519 | err = PTR_ERR(bh); | |
520 | goto out; | |
521 | } | |
522 | if (ext4_bg_has_super(sb, group)) { | |
523 | ext4_debug("mark backup superblock %#04llx (+0)\n", | |
524 | start); | |
525 | ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb + | |
526 | 1); | |
527 | } | |
528 | ext4_mark_bitmap_end(group_data[i].blocks_count, | |
529 | sb->s_blocksize * 8, bh->b_data); | |
530 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
531 | if (err) | |
532 | goto out; | |
533 | brelse(bh); | |
534 | ||
535 | handle_ib: | |
536 | if (bg_flags[i] & EXT4_BG_INODE_UNINIT) | |
537 | continue; | |
538 | ||
539 | /* Initialize inode bitmap of the @group */ | |
540 | block = group_data[i].inode_bitmap; | |
541 | err = extend_or_restart_transaction(handle, 1); | |
542 | if (err) | |
543 | goto out; | |
544 | /* Mark unused entries in inode bitmap used */ | |
545 | bh = bclean(handle, sb, block); | |
546 | if (IS_ERR(bh)) { | |
547 | err = PTR_ERR(bh); | |
548 | goto out; | |
549 | } | |
550 | ||
551 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), | |
552 | sb->s_blocksize * 8, bh->b_data); | |
553 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
554 | if (err) | |
555 | goto out; | |
556 | brelse(bh); | |
557 | } | |
558 | bh = NULL; | |
559 | ||
560 | /* Mark group tables in block bitmap */ | |
561 | for (j = 0; j < GROUP_TABLE_COUNT; j++) { | |
562 | count = group_table_count[j]; | |
563 | start = (&group_data[0].block_bitmap)[j]; | |
564 | block = start; | |
565 | for (i = 1; i < flex_gd->count; i++) { | |
566 | block += group_table_count[j]; | |
567 | if (block == (&group_data[i].block_bitmap)[j]) { | |
568 | count += group_table_count[j]; | |
569 | continue; | |
570 | } | |
571 | err = set_flexbg_block_bitmap(sb, handle, | |
572 | flex_gd, start, count); | |
573 | if (err) | |
574 | goto out; | |
575 | count = group_table_count[j]; | |
576 | start = group_data[i].block_bitmap; | |
577 | block = start; | |
578 | } | |
579 | ||
580 | if (count) { | |
581 | err = set_flexbg_block_bitmap(sb, handle, | |
582 | flex_gd, start, count); | |
583 | if (err) | |
584 | goto out; | |
585 | } | |
586 | } | |
587 | ||
588 | out: | |
589 | brelse(bh); | |
590 | err2 = ext4_journal_stop(handle); | |
591 | if (err2 && !err) | |
592 | err = err2; | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
ac27a0ec DK |
597 | /* |
598 | * Iterate through the groups which hold BACKUP superblock/GDT copies in an | |
617ba13b | 599 | * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before |
ac27a0ec DK |
600 | * calling this for the first time. In a sparse filesystem it will be the |
601 | * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ... | |
602 | * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ... | |
603 | */ | |
617ba13b | 604 | static unsigned ext4_list_backups(struct super_block *sb, unsigned *three, |
ac27a0ec DK |
605 | unsigned *five, unsigned *seven) |
606 | { | |
607 | unsigned *min = three; | |
608 | int mult = 3; | |
609 | unsigned ret; | |
610 | ||
617ba13b MC |
611 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, |
612 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
ac27a0ec DK |
613 | ret = *min; |
614 | *min += 1; | |
615 | return ret; | |
616 | } | |
617 | ||
618 | if (*five < *min) { | |
619 | min = five; | |
620 | mult = 5; | |
621 | } | |
622 | if (*seven < *min) { | |
623 | min = seven; | |
624 | mult = 7; | |
625 | } | |
626 | ||
627 | ret = *min; | |
628 | *min *= mult; | |
629 | ||
630 | return ret; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Check that all of the backup GDT blocks are held in the primary GDT block. | |
635 | * It is assumed that they are stored in group order. Returns the number of | |
636 | * groups in current filesystem that have BACKUPS, or -ve error code. | |
637 | */ | |
638 | static int verify_reserved_gdb(struct super_block *sb, | |
c72df9f9 | 639 | ext4_group_t end, |
ac27a0ec DK |
640 | struct buffer_head *primary) |
641 | { | |
617ba13b | 642 | const ext4_fsblk_t blk = primary->b_blocknr; |
ac27a0ec DK |
643 | unsigned three = 1; |
644 | unsigned five = 5; | |
645 | unsigned seven = 7; | |
646 | unsigned grp; | |
647 | __le32 *p = (__le32 *)primary->b_data; | |
648 | int gdbackups = 0; | |
649 | ||
617ba13b | 650 | while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) { |
bd81d8ee LV |
651 | if (le32_to_cpu(*p++) != |
652 | grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){ | |
12062ddd | 653 | ext4_warning(sb, "reserved GDT %llu" |
2ae02107 | 654 | " missing grp %d (%llu)", |
ac27a0ec | 655 | blk, grp, |
bd81d8ee LV |
656 | grp * |
657 | (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + | |
658 | blk); | |
ac27a0ec DK |
659 | return -EINVAL; |
660 | } | |
617ba13b | 661 | if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb)) |
ac27a0ec DK |
662 | return -EFBIG; |
663 | } | |
664 | ||
665 | return gdbackups; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Called when we need to bring a reserved group descriptor table block into | |
670 | * use from the resize inode. The primary copy of the new GDT block currently | |
671 | * is an indirect block (under the double indirect block in the resize inode). | |
672 | * The new backup GDT blocks will be stored as leaf blocks in this indirect | |
673 | * block, in group order. Even though we know all the block numbers we need, | |
674 | * we check to ensure that the resize inode has actually reserved these blocks. | |
675 | * | |
676 | * Don't need to update the block bitmaps because the blocks are still in use. | |
677 | * | |
678 | * We get all of the error cases out of the way, so that we are sure to not | |
679 | * fail once we start modifying the data on disk, because JBD has no rollback. | |
680 | */ | |
681 | static int add_new_gdb(handle_t *handle, struct inode *inode, | |
2f919710 | 682 | ext4_group_t group) |
ac27a0ec DK |
683 | { |
684 | struct super_block *sb = inode->i_sb; | |
617ba13b | 685 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
2f919710 | 686 | unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb); |
617ba13b | 687 | ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num; |
ac27a0ec DK |
688 | struct buffer_head **o_group_desc, **n_group_desc; |
689 | struct buffer_head *dind; | |
2f919710 | 690 | struct buffer_head *gdb_bh; |
ac27a0ec | 691 | int gdbackups; |
617ba13b | 692 | struct ext4_iloc iloc; |
ac27a0ec DK |
693 | __le32 *data; |
694 | int err; | |
695 | ||
696 | if (test_opt(sb, DEBUG)) | |
697 | printk(KERN_DEBUG | |
617ba13b | 698 | "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n", |
ac27a0ec DK |
699 | gdb_num); |
700 | ||
af5bc92d TT |
701 | /* |
702 | * If we are not using the primary superblock/GDT copy don't resize, | |
2b2d6d01 TT |
703 | * because the user tools have no way of handling this. Probably a |
704 | * bad time to do it anyways. | |
705 | */ | |
617ba13b MC |
706 | if (EXT4_SB(sb)->s_sbh->b_blocknr != |
707 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { | |
12062ddd | 708 | ext4_warning(sb, "won't resize using backup superblock at %llu", |
617ba13b | 709 | (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr); |
ac27a0ec DK |
710 | return -EPERM; |
711 | } | |
712 | ||
2f919710 YY |
713 | gdb_bh = sb_bread(sb, gdblock); |
714 | if (!gdb_bh) | |
ac27a0ec DK |
715 | return -EIO; |
716 | ||
c72df9f9 | 717 | gdbackups = verify_reserved_gdb(sb, group, gdb_bh); |
2f919710 | 718 | if (gdbackups < 0) { |
ac27a0ec DK |
719 | err = gdbackups; |
720 | goto exit_bh; | |
721 | } | |
722 | ||
617ba13b | 723 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
724 | dind = sb_bread(sb, le32_to_cpu(*data)); |
725 | if (!dind) { | |
726 | err = -EIO; | |
727 | goto exit_bh; | |
728 | } | |
729 | ||
730 | data = (__le32 *)dind->b_data; | |
617ba13b | 731 | if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) { |
12062ddd | 732 | ext4_warning(sb, "new group %u GDT block %llu not reserved", |
2f919710 | 733 | group, gdblock); |
ac27a0ec DK |
734 | err = -EINVAL; |
735 | goto exit_dind; | |
736 | } | |
737 | ||
b4097142 TT |
738 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); |
739 | if (unlikely(err)) | |
ac27a0ec DK |
740 | goto exit_dind; |
741 | ||
2f919710 | 742 | err = ext4_journal_get_write_access(handle, gdb_bh); |
b4097142 | 743 | if (unlikely(err)) |
ac27a0ec DK |
744 | goto exit_sbh; |
745 | ||
b4097142 TT |
746 | err = ext4_journal_get_write_access(handle, dind); |
747 | if (unlikely(err)) | |
748 | ext4_std_error(sb, err); | |
ac27a0ec | 749 | |
617ba13b | 750 | /* ext4_reserve_inode_write() gets a reference on the iloc */ |
b4097142 TT |
751 | err = ext4_reserve_inode_write(handle, inode, &iloc); |
752 | if (unlikely(err)) | |
ac27a0ec DK |
753 | goto exit_dindj; |
754 | ||
f18a5f21 TT |
755 | n_group_desc = ext4_kvmalloc((gdb_num + 1) * |
756 | sizeof(struct buffer_head *), | |
757 | GFP_NOFS); | |
ac27a0ec DK |
758 | if (!n_group_desc) { |
759 | err = -ENOMEM; | |
f18a5f21 TT |
760 | ext4_warning(sb, "not enough memory for %lu groups", |
761 | gdb_num + 1); | |
ac27a0ec DK |
762 | goto exit_inode; |
763 | } | |
764 | ||
765 | /* | |
766 | * Finally, we have all of the possible failures behind us... | |
767 | * | |
768 | * Remove new GDT block from inode double-indirect block and clear out | |
769 | * the new GDT block for use (which also "frees" the backup GDT blocks | |
770 | * from the reserved inode). We don't need to change the bitmaps for | |
771 | * these blocks, because they are marked as in-use from being in the | |
772 | * reserved inode, and will become GDT blocks (primary and backup). | |
773 | */ | |
617ba13b | 774 | data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0; |
b4097142 TT |
775 | err = ext4_handle_dirty_metadata(handle, NULL, dind); |
776 | if (unlikely(err)) { | |
777 | ext4_std_error(sb, err); | |
778 | goto exit_inode; | |
779 | } | |
ac27a0ec | 780 | inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9; |
617ba13b | 781 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
2f919710 YY |
782 | memset(gdb_bh->b_data, 0, sb->s_blocksize); |
783 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
b4097142 TT |
784 | if (unlikely(err)) { |
785 | ext4_std_error(sb, err); | |
786 | goto exit_inode; | |
787 | } | |
788 | brelse(dind); | |
ac27a0ec | 789 | |
617ba13b | 790 | o_group_desc = EXT4_SB(sb)->s_group_desc; |
ac27a0ec | 791 | memcpy(n_group_desc, o_group_desc, |
617ba13b | 792 | EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *)); |
2f919710 | 793 | n_group_desc[gdb_num] = gdb_bh; |
617ba13b MC |
794 | EXT4_SB(sb)->s_group_desc = n_group_desc; |
795 | EXT4_SB(sb)->s_gdb_count++; | |
f18a5f21 | 796 | ext4_kvfree(o_group_desc); |
ac27a0ec | 797 | |
e8546d06 | 798 | le16_add_cpu(&es->s_reserved_gdt_blocks, -1); |
b4097142 TT |
799 | err = ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); |
800 | if (err) | |
801 | ext4_std_error(sb, err); | |
ac27a0ec | 802 | |
b4097142 | 803 | return err; |
ac27a0ec DK |
804 | |
805 | exit_inode: | |
f18a5f21 | 806 | ext4_kvfree(n_group_desc); |
537a0310 | 807 | /* ext4_handle_release_buffer(handle, iloc.bh); */ |
ac27a0ec DK |
808 | brelse(iloc.bh); |
809 | exit_dindj: | |
537a0310 | 810 | /* ext4_handle_release_buffer(handle, dind); */ |
ac27a0ec | 811 | exit_sbh: |
537a0310 | 812 | /* ext4_handle_release_buffer(handle, EXT4_SB(sb)->s_sbh); */ |
ac27a0ec DK |
813 | exit_dind: |
814 | brelse(dind); | |
815 | exit_bh: | |
2f919710 | 816 | brelse(gdb_bh); |
ac27a0ec | 817 | |
617ba13b | 818 | ext4_debug("leaving with error %d\n", err); |
ac27a0ec DK |
819 | return err; |
820 | } | |
821 | ||
822 | /* | |
823 | * Called when we are adding a new group which has a backup copy of each of | |
824 | * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks. | |
825 | * We need to add these reserved backup GDT blocks to the resize inode, so | |
826 | * that they are kept for future resizing and not allocated to files. | |
827 | * | |
828 | * Each reserved backup GDT block will go into a different indirect block. | |
829 | * The indirect blocks are actually the primary reserved GDT blocks, | |
830 | * so we know in advance what their block numbers are. We only get the | |
831 | * double-indirect block to verify it is pointing to the primary reserved | |
832 | * GDT blocks so we don't overwrite a data block by accident. The reserved | |
833 | * backup GDT blocks are stored in their reserved primary GDT block. | |
834 | */ | |
835 | static int reserve_backup_gdb(handle_t *handle, struct inode *inode, | |
668f4dc5 | 836 | ext4_group_t group) |
ac27a0ec DK |
837 | { |
838 | struct super_block *sb = inode->i_sb; | |
617ba13b | 839 | int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks); |
ac27a0ec DK |
840 | struct buffer_head **primary; |
841 | struct buffer_head *dind; | |
617ba13b MC |
842 | struct ext4_iloc iloc; |
843 | ext4_fsblk_t blk; | |
ac27a0ec DK |
844 | __le32 *data, *end; |
845 | int gdbackups = 0; | |
846 | int res, i; | |
847 | int err; | |
848 | ||
216553c4 | 849 | primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS); |
ac27a0ec DK |
850 | if (!primary) |
851 | return -ENOMEM; | |
852 | ||
617ba13b | 853 | data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK; |
ac27a0ec DK |
854 | dind = sb_bread(sb, le32_to_cpu(*data)); |
855 | if (!dind) { | |
856 | err = -EIO; | |
857 | goto exit_free; | |
858 | } | |
859 | ||
617ba13b | 860 | blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count; |
94460093 JB |
861 | data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count % |
862 | EXT4_ADDR_PER_BLOCK(sb)); | |
617ba13b | 863 | end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb); |
ac27a0ec DK |
864 | |
865 | /* Get each reserved primary GDT block and verify it holds backups */ | |
866 | for (res = 0; res < reserved_gdb; res++, blk++) { | |
867 | if (le32_to_cpu(*data) != blk) { | |
12062ddd | 868 | ext4_warning(sb, "reserved block %llu" |
ac27a0ec DK |
869 | " not at offset %ld", |
870 | blk, | |
871 | (long)(data - (__le32 *)dind->b_data)); | |
872 | err = -EINVAL; | |
873 | goto exit_bh; | |
874 | } | |
875 | primary[res] = sb_bread(sb, blk); | |
876 | if (!primary[res]) { | |
877 | err = -EIO; | |
878 | goto exit_bh; | |
879 | } | |
c72df9f9 YY |
880 | gdbackups = verify_reserved_gdb(sb, group, primary[res]); |
881 | if (gdbackups < 0) { | |
ac27a0ec DK |
882 | brelse(primary[res]); |
883 | err = gdbackups; | |
884 | goto exit_bh; | |
885 | } | |
886 | if (++data >= end) | |
887 | data = (__le32 *)dind->b_data; | |
888 | } | |
889 | ||
890 | for (i = 0; i < reserved_gdb; i++) { | |
617ba13b | 891 | if ((err = ext4_journal_get_write_access(handle, primary[i]))) { |
ac27a0ec DK |
892 | /* |
893 | int j; | |
894 | for (j = 0; j < i; j++) | |
537a0310 | 895 | ext4_handle_release_buffer(handle, primary[j]); |
ac27a0ec DK |
896 | */ |
897 | goto exit_bh; | |
898 | } | |
899 | } | |
900 | ||
617ba13b | 901 | if ((err = ext4_reserve_inode_write(handle, inode, &iloc))) |
ac27a0ec DK |
902 | goto exit_bh; |
903 | ||
904 | /* | |
905 | * Finally we can add each of the reserved backup GDT blocks from | |
906 | * the new group to its reserved primary GDT block. | |
907 | */ | |
668f4dc5 | 908 | blk = group * EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
909 | for (i = 0; i < reserved_gdb; i++) { |
910 | int err2; | |
911 | data = (__le32 *)primary[i]->b_data; | |
912 | /* printk("reserving backup %lu[%u] = %lu\n", | |
913 | primary[i]->b_blocknr, gdbackups, | |
914 | blk + primary[i]->b_blocknr); */ | |
915 | data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr); | |
0390131b | 916 | err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]); |
ac27a0ec DK |
917 | if (!err) |
918 | err = err2; | |
919 | } | |
920 | inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9; | |
617ba13b | 921 | ext4_mark_iloc_dirty(handle, inode, &iloc); |
ac27a0ec DK |
922 | |
923 | exit_bh: | |
924 | while (--res >= 0) | |
925 | brelse(primary[res]); | |
926 | brelse(dind); | |
927 | ||
928 | exit_free: | |
929 | kfree(primary); | |
930 | ||
931 | return err; | |
932 | } | |
933 | ||
934 | /* | |
617ba13b | 935 | * Update the backup copies of the ext4 metadata. These don't need to be part |
ac27a0ec DK |
936 | * of the main resize transaction, because e2fsck will re-write them if there |
937 | * is a problem (basically only OOM will cause a problem). However, we | |
938 | * _should_ update the backups if possible, in case the primary gets trashed | |
939 | * for some reason and we need to run e2fsck from a backup superblock. The | |
940 | * important part is that the new block and inode counts are in the backup | |
941 | * superblocks, and the location of the new group metadata in the GDT backups. | |
942 | * | |
32ed5058 TT |
943 | * We do not need take the s_resize_lock for this, because these |
944 | * blocks are not otherwise touched by the filesystem code when it is | |
945 | * mounted. We don't need to worry about last changing from | |
946 | * sbi->s_groups_count, because the worst that can happen is that we | |
947 | * do not copy the full number of backups at this time. The resize | |
948 | * which changed s_groups_count will backup again. | |
ac27a0ec DK |
949 | */ |
950 | static void update_backups(struct super_block *sb, | |
951 | int blk_off, char *data, int size) | |
952 | { | |
617ba13b | 953 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 954 | const ext4_group_t last = sbi->s_groups_count; |
617ba13b | 955 | const int bpg = EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
956 | unsigned three = 1; |
957 | unsigned five = 5; | |
958 | unsigned seven = 7; | |
fd2d4291 | 959 | ext4_group_t group; |
ac27a0ec DK |
960 | int rest = sb->s_blocksize - size; |
961 | handle_t *handle; | |
962 | int err = 0, err2; | |
963 | ||
617ba13b | 964 | handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA); |
ac27a0ec DK |
965 | if (IS_ERR(handle)) { |
966 | group = 1; | |
967 | err = PTR_ERR(handle); | |
968 | goto exit_err; | |
969 | } | |
970 | ||
617ba13b | 971 | while ((group = ext4_list_backups(sb, &three, &five, &seven)) < last) { |
ac27a0ec DK |
972 | struct buffer_head *bh; |
973 | ||
974 | /* Out of journal space, and can't get more - abort - so sad */ | |
0390131b FM |
975 | if (ext4_handle_valid(handle) && |
976 | handle->h_buffer_credits == 0 && | |
617ba13b MC |
977 | ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) && |
978 | (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA))) | |
ac27a0ec DK |
979 | break; |
980 | ||
981 | bh = sb_getblk(sb, group * bpg + blk_off); | |
982 | if (!bh) { | |
983 | err = -EIO; | |
984 | break; | |
985 | } | |
617ba13b | 986 | ext4_debug("update metadata backup %#04lx\n", |
ac27a0ec | 987 | (unsigned long)bh->b_blocknr); |
617ba13b | 988 | if ((err = ext4_journal_get_write_access(handle, bh))) |
ac27a0ec DK |
989 | break; |
990 | lock_buffer(bh); | |
991 | memcpy(bh->b_data, data, size); | |
992 | if (rest) | |
993 | memset(bh->b_data + size, 0, rest); | |
994 | set_buffer_uptodate(bh); | |
995 | unlock_buffer(bh); | |
b4097142 TT |
996 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
997 | if (unlikely(err)) | |
998 | ext4_std_error(sb, err); | |
ac27a0ec DK |
999 | brelse(bh); |
1000 | } | |
617ba13b | 1001 | if ((err2 = ext4_journal_stop(handle)) && !err) |
ac27a0ec DK |
1002 | err = err2; |
1003 | ||
1004 | /* | |
1005 | * Ugh! Need to have e2fsck write the backup copies. It is too | |
1006 | * late to revert the resize, we shouldn't fail just because of | |
1007 | * the backup copies (they are only needed in case of corruption). | |
1008 | * | |
1009 | * However, if we got here we have a journal problem too, so we | |
1010 | * can't really start a transaction to mark the superblock. | |
1011 | * Chicken out and just set the flag on the hope it will be written | |
1012 | * to disk, and if not - we will simply wait until next fsck. | |
1013 | */ | |
1014 | exit_err: | |
1015 | if (err) { | |
12062ddd | 1016 | ext4_warning(sb, "can't update backup for group %u (err %d), " |
ac27a0ec | 1017 | "forcing fsck on next reboot", group, err); |
617ba13b MC |
1018 | sbi->s_mount_state &= ~EXT4_VALID_FS; |
1019 | sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec DK |
1020 | mark_buffer_dirty(sbi->s_sbh); |
1021 | } | |
1022 | } | |
1023 | ||
bb08c1e7 YY |
1024 | /* |
1025 | * ext4_add_new_descs() adds @count group descriptor of groups | |
1026 | * starting at @group | |
1027 | * | |
1028 | * @handle: journal handle | |
1029 | * @sb: super block | |
1030 | * @group: the group no. of the first group desc to be added | |
1031 | * @resize_inode: the resize inode | |
1032 | * @count: number of group descriptors to be added | |
1033 | */ | |
1034 | static int ext4_add_new_descs(handle_t *handle, struct super_block *sb, | |
1035 | ext4_group_t group, struct inode *resize_inode, | |
1036 | ext4_group_t count) | |
1037 | { | |
1038 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1039 | struct ext4_super_block *es = sbi->s_es; | |
1040 | struct buffer_head *gdb_bh; | |
1041 | int i, gdb_off, gdb_num, err = 0; | |
1042 | ||
1043 | for (i = 0; i < count; i++, group++) { | |
1044 | int reserved_gdb = ext4_bg_has_super(sb, group) ? | |
1045 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; | |
1046 | ||
1047 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1048 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1049 | ||
1050 | /* | |
1051 | * We will only either add reserved group blocks to a backup group | |
1052 | * or remove reserved blocks for the first group in a new group block. | |
1053 | * Doing both would be mean more complex code, and sane people don't | |
1054 | * use non-sparse filesystems anymore. This is already checked above. | |
1055 | */ | |
1056 | if (gdb_off) { | |
1057 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1058 | err = ext4_journal_get_write_access(handle, gdb_bh); | |
1059 | ||
1060 | if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group)) | |
1061 | err = reserve_backup_gdb(handle, resize_inode, group); | |
1062 | } else | |
1063 | err = add_new_gdb(handle, resize_inode, group); | |
1064 | if (err) | |
1065 | break; | |
1066 | } | |
1067 | return err; | |
1068 | } | |
1069 | ||
083f5b24 YY |
1070 | /* |
1071 | * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg | |
1072 | */ | |
1073 | static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb, | |
1074 | struct ext4_new_flex_group_data *flex_gd) | |
1075 | { | |
1076 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1077 | struct ext4_group_desc *gdp; | |
1078 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1079 | struct buffer_head *gdb_bh; | |
1080 | ext4_group_t group; | |
1081 | __u16 *bg_flags = flex_gd->bg_flags; | |
1082 | int i, gdb_off, gdb_num, err = 0; | |
1083 | ||
1084 | ||
1085 | for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) { | |
1086 | group = group_data->group; | |
1087 | ||
1088 | gdb_off = group % EXT4_DESC_PER_BLOCK(sb); | |
1089 | gdb_num = group / EXT4_DESC_PER_BLOCK(sb); | |
1090 | ||
1091 | /* | |
1092 | * get_write_access() has been called on gdb_bh by ext4_add_new_desc(). | |
1093 | */ | |
1094 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1095 | /* Update group descriptor block for new group */ | |
1096 | gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data + | |
1097 | gdb_off * EXT4_DESC_SIZE(sb)); | |
1098 | ||
1099 | memset(gdp, 0, EXT4_DESC_SIZE(sb)); | |
1100 | ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap); | |
1101 | ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap); | |
1102 | ext4_inode_table_set(sb, gdp, group_data->inode_table); | |
1103 | ext4_free_group_clusters_set(sb, gdp, | |
1104 | EXT4_B2C(sbi, group_data->free_blocks_count)); | |
1105 | ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb)); | |
1106 | gdp->bg_flags = cpu_to_le16(*bg_flags); | |
1107 | gdp->bg_checksum = ext4_group_desc_csum(sbi, group, gdp); | |
1108 | ||
1109 | err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh); | |
1110 | if (unlikely(err)) { | |
1111 | ext4_std_error(sb, err); | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * We can allocate memory for mb_alloc based on the new group | |
1117 | * descriptor | |
1118 | */ | |
1119 | err = ext4_mb_add_groupinfo(sb, group, gdp); | |
1120 | if (err) | |
1121 | break; | |
1122 | } | |
1123 | return err; | |
1124 | } | |
1125 | ||
2e10e2f2 YY |
1126 | /* |
1127 | * ext4_update_super() updates the super block so that the newly added | |
1128 | * groups can be seen by the filesystem. | |
1129 | * | |
1130 | * @sb: super block | |
1131 | * @flex_gd: new added groups | |
1132 | */ | |
1133 | static void ext4_update_super(struct super_block *sb, | |
1134 | struct ext4_new_flex_group_data *flex_gd) | |
1135 | { | |
1136 | ext4_fsblk_t blocks_count = 0; | |
1137 | ext4_fsblk_t free_blocks = 0; | |
1138 | ext4_fsblk_t reserved_blocks = 0; | |
1139 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1140 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1141 | struct ext4_super_block *es = sbi->s_es; | |
1142 | int i; | |
1143 | ||
1144 | BUG_ON(flex_gd->count == 0 || group_data == NULL); | |
1145 | /* | |
1146 | * Make the new blocks and inodes valid next. We do this before | |
1147 | * increasing the group count so that once the group is enabled, | |
1148 | * all of its blocks and inodes are already valid. | |
1149 | * | |
1150 | * We always allocate group-by-group, then block-by-block or | |
1151 | * inode-by-inode within a group, so enabling these | |
1152 | * blocks/inodes before the group is live won't actually let us | |
1153 | * allocate the new space yet. | |
1154 | */ | |
1155 | for (i = 0; i < flex_gd->count; i++) { | |
1156 | blocks_count += group_data[i].blocks_count; | |
1157 | free_blocks += group_data[i].free_blocks_count; | |
1158 | } | |
1159 | ||
1160 | reserved_blocks = ext4_r_blocks_count(es) * 100; | |
1161 | do_div(reserved_blocks, ext4_blocks_count(es)); | |
1162 | reserved_blocks *= blocks_count; | |
1163 | do_div(reserved_blocks, 100); | |
1164 | ||
1165 | ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count); | |
636d7e2e | 1166 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks); |
2e10e2f2 YY |
1167 | le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1168 | flex_gd->count); | |
636d7e2e DW |
1169 | le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) * |
1170 | flex_gd->count); | |
2e10e2f2 YY |
1171 | |
1172 | /* | |
1173 | * We need to protect s_groups_count against other CPUs seeing | |
1174 | * inconsistent state in the superblock. | |
1175 | * | |
1176 | * The precise rules we use are: | |
1177 | * | |
1178 | * * Writers must perform a smp_wmb() after updating all | |
1179 | * dependent data and before modifying the groups count | |
1180 | * | |
1181 | * * Readers must perform an smp_rmb() after reading the groups | |
1182 | * count and before reading any dependent data. | |
1183 | * | |
1184 | * NB. These rules can be relaxed when checking the group count | |
1185 | * while freeing data, as we can only allocate from a block | |
1186 | * group after serialising against the group count, and we can | |
1187 | * only then free after serialising in turn against that | |
1188 | * allocation. | |
1189 | */ | |
1190 | smp_wmb(); | |
1191 | ||
1192 | /* Update the global fs size fields */ | |
1193 | sbi->s_groups_count += flex_gd->count; | |
1194 | ||
1195 | /* Update the reserved block counts only once the new group is | |
1196 | * active. */ | |
1197 | ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) + | |
1198 | reserved_blocks); | |
1199 | ||
1200 | /* Update the free space counts */ | |
1201 | percpu_counter_add(&sbi->s_freeclusters_counter, | |
1202 | EXT4_B2C(sbi, free_blocks)); | |
1203 | percpu_counter_add(&sbi->s_freeinodes_counter, | |
1204 | EXT4_INODES_PER_GROUP(sb) * flex_gd->count); | |
1205 | ||
1206 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, | |
1207 | EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1208 | sbi->s_log_groups_per_flex) { | |
1209 | ext4_group_t flex_group; | |
1210 | flex_group = ext4_flex_group(sbi, group_data[0].group); | |
1211 | atomic_add(EXT4_B2C(sbi, free_blocks), | |
1212 | &sbi->s_flex_groups[flex_group].free_clusters); | |
1213 | atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, | |
1214 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1215 | } | |
1216 | ||
1217 | if (test_opt(sb, DEBUG)) | |
1218 | printk(KERN_DEBUG "EXT4-fs: added group %u:" | |
1219 | "%llu blocks(%llu free %llu reserved)\n", flex_gd->count, | |
1220 | blocks_count, free_blocks, reserved_blocks); | |
1221 | } | |
1222 | ||
4bac1f8c YY |
1223 | /* Add a flex group to an fs. Ensure we handle all possible error conditions |
1224 | * _before_ we start modifying the filesystem, because we cannot abort the | |
1225 | * transaction and not have it write the data to disk. | |
1226 | */ | |
1227 | static int ext4_flex_group_add(struct super_block *sb, | |
1228 | struct inode *resize_inode, | |
1229 | struct ext4_new_flex_group_data *flex_gd) | |
1230 | { | |
1231 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1232 | struct ext4_super_block *es = sbi->s_es; | |
1233 | ext4_fsblk_t o_blocks_count; | |
1234 | ext4_grpblk_t last; | |
1235 | ext4_group_t group; | |
1236 | handle_t *handle; | |
1237 | unsigned reserved_gdb; | |
1238 | int err = 0, err2 = 0, credit; | |
1239 | ||
1240 | BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags); | |
1241 | ||
1242 | reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks); | |
1243 | o_blocks_count = ext4_blocks_count(es); | |
1244 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1245 | BUG_ON(last); | |
1246 | ||
1247 | err = setup_new_flex_group_blocks(sb, flex_gd); | |
1248 | if (err) | |
1249 | goto exit; | |
1250 | /* | |
1251 | * We will always be modifying at least the superblock and GDT | |
1252 | * block. If we are adding a group past the last current GDT block, | |
1253 | * we will also modify the inode and the dindirect block. If we | |
1254 | * are adding a group with superblock/GDT backups we will also | |
1255 | * modify each of the reserved GDT dindirect blocks. | |
1256 | */ | |
1257 | credit = flex_gd->count * 4 + reserved_gdb; | |
1258 | handle = ext4_journal_start_sb(sb, credit); | |
1259 | if (IS_ERR(handle)) { | |
1260 | err = PTR_ERR(handle); | |
1261 | goto exit; | |
1262 | } | |
1263 | ||
1264 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
1265 | if (err) | |
1266 | goto exit_journal; | |
1267 | ||
1268 | group = flex_gd->groups[0].group; | |
1269 | BUG_ON(group != EXT4_SB(sb)->s_groups_count); | |
1270 | err = ext4_add_new_descs(handle, sb, group, | |
1271 | resize_inode, flex_gd->count); | |
1272 | if (err) | |
1273 | goto exit_journal; | |
1274 | ||
1275 | err = ext4_setup_new_descs(handle, sb, flex_gd); | |
1276 | if (err) | |
1277 | goto exit_journal; | |
1278 | ||
1279 | ext4_update_super(sb, flex_gd); | |
1280 | ||
1281 | err = ext4_handle_dirty_super(handle, sb); | |
1282 | ||
1283 | exit_journal: | |
1284 | err2 = ext4_journal_stop(handle); | |
1285 | if (!err) | |
1286 | err = err2; | |
1287 | ||
1288 | if (!err) { | |
1289 | int i; | |
1290 | update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es, | |
1291 | sizeof(struct ext4_super_block)); | |
1292 | for (i = 0; i < flex_gd->count; i++, group++) { | |
1293 | struct buffer_head *gdb_bh; | |
1294 | int gdb_num; | |
1295 | gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb); | |
1296 | gdb_bh = sbi->s_group_desc[gdb_num]; | |
1297 | update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data, | |
1298 | gdb_bh->b_size); | |
1299 | } | |
1300 | } | |
1301 | exit: | |
1302 | return err; | |
1303 | } | |
1304 | ||
19c5246d YY |
1305 | static int ext4_setup_next_flex_gd(struct super_block *sb, |
1306 | struct ext4_new_flex_group_data *flex_gd, | |
1307 | ext4_fsblk_t n_blocks_count, | |
1308 | unsigned long flexbg_size) | |
1309 | { | |
1310 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1311 | struct ext4_new_group_data *group_data = flex_gd->groups; | |
1312 | ext4_fsblk_t o_blocks_count; | |
1313 | ext4_group_t n_group; | |
1314 | ext4_group_t group; | |
1315 | ext4_group_t last_group; | |
1316 | ext4_grpblk_t last; | |
1317 | ext4_grpblk_t blocks_per_group; | |
1318 | unsigned long i; | |
1319 | ||
1320 | blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb); | |
1321 | ||
1322 | o_blocks_count = ext4_blocks_count(es); | |
1323 | ||
1324 | if (o_blocks_count == n_blocks_count) | |
1325 | return 0; | |
1326 | ||
1327 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); | |
1328 | BUG_ON(last); | |
1329 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last); | |
1330 | ||
1331 | last_group = group | (flexbg_size - 1); | |
1332 | if (last_group > n_group) | |
1333 | last_group = n_group; | |
1334 | ||
1335 | flex_gd->count = last_group - group + 1; | |
1336 | ||
1337 | for (i = 0; i < flex_gd->count; i++) { | |
1338 | int overhead; | |
1339 | ||
1340 | group_data[i].group = group + i; | |
1341 | group_data[i].blocks_count = blocks_per_group; | |
1342 | overhead = ext4_bg_has_super(sb, group + i) ? | |
1343 | (1 + ext4_bg_num_gdb(sb, group + i) + | |
1344 | le16_to_cpu(es->s_reserved_gdt_blocks)) : 0; | |
1345 | group_data[i].free_blocks_count = blocks_per_group - overhead; | |
1346 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1347 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) | |
1348 | flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT | | |
1349 | EXT4_BG_INODE_UNINIT; | |
1350 | else | |
1351 | flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED; | |
1352 | } | |
1353 | ||
1354 | if (last_group == n_group && | |
1355 | EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1356 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) | |
1357 | /* We need to initialize block bitmap of last group. */ | |
1358 | flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT; | |
1359 | ||
1360 | if ((last_group == n_group) && (last != blocks_per_group - 1)) { | |
1361 | group_data[i - 1].blocks_count = last + 1; | |
1362 | group_data[i - 1].free_blocks_count -= blocks_per_group- | |
1363 | last - 1; | |
1364 | } | |
1365 | ||
1366 | return 1; | |
1367 | } | |
1368 | ||
ac27a0ec DK |
1369 | /* Add group descriptor data to an existing or new group descriptor block. |
1370 | * Ensure we handle all possible error conditions _before_ we start modifying | |
1371 | * the filesystem, because we cannot abort the transaction and not have it | |
1372 | * write the data to disk. | |
1373 | * | |
1374 | * If we are on a GDT block boundary, we need to get the reserved GDT block. | |
1375 | * Otherwise, we may need to add backup GDT blocks for a sparse group. | |
1376 | * | |
1377 | * We only need to hold the superblock lock while we are actually adding | |
1378 | * in the new group's counts to the superblock. Prior to that we have | |
1379 | * not really "added" the group at all. We re-check that we are still | |
1380 | * adding in the last group in case things have changed since verifying. | |
1381 | */ | |
617ba13b | 1382 | int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) |
ac27a0ec | 1383 | { |
61f296cc | 1384 | struct ext4_new_flex_group_data flex_gd; |
617ba13b MC |
1385 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1386 | struct ext4_super_block *es = sbi->s_es; | |
1387 | int reserved_gdb = ext4_bg_has_super(sb, input->group) ? | |
ac27a0ec | 1388 | le16_to_cpu(es->s_reserved_gdt_blocks) : 0; |
ac27a0ec | 1389 | struct inode *inode = NULL; |
ac27a0ec | 1390 | int gdb_off, gdb_num; |
61f296cc YY |
1391 | int err; |
1392 | __u16 bg_flags = 0; | |
ac27a0ec | 1393 | |
617ba13b MC |
1394 | gdb_num = input->group / EXT4_DESC_PER_BLOCK(sb); |
1395 | gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec | 1396 | |
617ba13b MC |
1397 | if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb, |
1398 | EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) { | |
12062ddd | 1399 | ext4_warning(sb, "Can't resize non-sparse filesystem further"); |
ac27a0ec DK |
1400 | return -EPERM; |
1401 | } | |
1402 | ||
bd81d8ee LV |
1403 | if (ext4_blocks_count(es) + input->blocks_count < |
1404 | ext4_blocks_count(es)) { | |
12062ddd | 1405 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1406 | return -EINVAL; |
1407 | } | |
1408 | ||
617ba13b | 1409 | if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) < |
ac27a0ec | 1410 | le32_to_cpu(es->s_inodes_count)) { |
12062ddd | 1411 | ext4_warning(sb, "inodes_count overflow"); |
ac27a0ec DK |
1412 | return -EINVAL; |
1413 | } | |
1414 | ||
1415 | if (reserved_gdb || gdb_off == 0) { | |
617ba13b | 1416 | if (!EXT4_HAS_COMPAT_FEATURE(sb, |
37609fd5 JB |
1417 | EXT4_FEATURE_COMPAT_RESIZE_INODE) |
1418 | || !le16_to_cpu(es->s_reserved_gdt_blocks)) { | |
12062ddd | 1419 | ext4_warning(sb, |
ac27a0ec DK |
1420 | "No reserved GDT blocks, can't resize"); |
1421 | return -EPERM; | |
1422 | } | |
1d1fe1ee DH |
1423 | inode = ext4_iget(sb, EXT4_RESIZE_INO); |
1424 | if (IS_ERR(inode)) { | |
12062ddd | 1425 | ext4_warning(sb, "Error opening resize inode"); |
1d1fe1ee | 1426 | return PTR_ERR(inode); |
ac27a0ec DK |
1427 | } |
1428 | } | |
1429 | ||
920313a7 | 1430 | |
61f296cc | 1431 | err = verify_group_input(sb, input); |
08c3a813 | 1432 | if (err) |
61f296cc | 1433 | goto out; |
ac27a0ec | 1434 | |
61f296cc YY |
1435 | flex_gd.count = 1; |
1436 | flex_gd.groups = input; | |
1437 | flex_gd.bg_flags = &bg_flags; | |
1438 | err = ext4_flex_group_add(sb, inode, &flex_gd); | |
1439 | out: | |
ac27a0ec DK |
1440 | iput(inode); |
1441 | return err; | |
617ba13b | 1442 | } /* ext4_group_add */ |
ac27a0ec | 1443 | |
18e31438 YY |
1444 | /* |
1445 | * extend a group without checking assuming that checking has been done. | |
1446 | */ | |
1447 | static int ext4_group_extend_no_check(struct super_block *sb, | |
1448 | ext4_fsblk_t o_blocks_count, ext4_grpblk_t add) | |
1449 | { | |
1450 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
1451 | handle_t *handle; | |
1452 | int err = 0, err2; | |
1453 | ||
1454 | /* We will update the superblock, one block bitmap, and | |
1455 | * one group descriptor via ext4_group_add_blocks(). | |
1456 | */ | |
1457 | handle = ext4_journal_start_sb(sb, 3); | |
1458 | if (IS_ERR(handle)) { | |
1459 | err = PTR_ERR(handle); | |
1460 | ext4_warning(sb, "error %d on journal start", err); | |
1461 | return err; | |
1462 | } | |
1463 | ||
1464 | err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); | |
1465 | if (err) { | |
1466 | ext4_warning(sb, "error %d on journal write access", err); | |
1467 | goto errout; | |
1468 | } | |
1469 | ||
1470 | ext4_blocks_count_set(es, o_blocks_count + add); | |
636d7e2e | 1471 | ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add); |
18e31438 YY |
1472 | ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count, |
1473 | o_blocks_count + add); | |
1474 | /* We add the blocks to the bitmap and set the group need init bit */ | |
1475 | err = ext4_group_add_blocks(handle, sb, o_blocks_count, add); | |
1476 | if (err) | |
1477 | goto errout; | |
1478 | ext4_handle_dirty_super(handle, sb); | |
1479 | ext4_debug("freed blocks %llu through %llu\n", o_blocks_count, | |
1480 | o_blocks_count + add); | |
1481 | errout: | |
1482 | err2 = ext4_journal_stop(handle); | |
1483 | if (err2 && !err) | |
1484 | err = err2; | |
1485 | ||
1486 | if (!err) { | |
1487 | if (test_opt(sb, DEBUG)) | |
1488 | printk(KERN_DEBUG "EXT4-fs: extended group to %llu " | |
1489 | "blocks\n", ext4_blocks_count(es)); | |
1490 | update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es, | |
1491 | sizeof(struct ext4_super_block)); | |
1492 | } | |
1493 | return err; | |
1494 | } | |
1495 | ||
2b2d6d01 TT |
1496 | /* |
1497 | * Extend the filesystem to the new number of blocks specified. This entry | |
ac27a0ec DK |
1498 | * point is only used to extend the current filesystem to the end of the last |
1499 | * existing group. It can be accessed via ioctl, or by "remount,resize=<size>" | |
1500 | * for emergencies (because it has no dependencies on reserved blocks). | |
1501 | * | |
617ba13b | 1502 | * If we _really_ wanted, we could use default values to call ext4_group_add() |
ac27a0ec DK |
1503 | * allow the "remount" trick to work for arbitrary resizing, assuming enough |
1504 | * GDT blocks are reserved to grow to the desired size. | |
1505 | */ | |
617ba13b MC |
1506 | int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, |
1507 | ext4_fsblk_t n_blocks_count) | |
ac27a0ec | 1508 | { |
617ba13b | 1509 | ext4_fsblk_t o_blocks_count; |
617ba13b MC |
1510 | ext4_grpblk_t last; |
1511 | ext4_grpblk_t add; | |
af5bc92d | 1512 | struct buffer_head *bh; |
d89651c8 | 1513 | int err; |
5f21b0e6 | 1514 | ext4_group_t group; |
ac27a0ec | 1515 | |
bd81d8ee | 1516 | o_blocks_count = ext4_blocks_count(es); |
ac27a0ec DK |
1517 | |
1518 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1519 | ext4_msg(sb, KERN_DEBUG, |
1520 | "extending last group from %llu to %llu blocks", | |
1521 | o_blocks_count, n_blocks_count); | |
ac27a0ec DK |
1522 | |
1523 | if (n_blocks_count == 0 || n_blocks_count == o_blocks_count) | |
1524 | return 0; | |
1525 | ||
1526 | if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
92b97816 TT |
1527 | ext4_msg(sb, KERN_ERR, |
1528 | "filesystem too large to resize to %llu blocks safely", | |
1529 | n_blocks_count); | |
ac27a0ec | 1530 | if (sizeof(sector_t) < 8) |
12062ddd | 1531 | ext4_warning(sb, "CONFIG_LBDAF not enabled"); |
ac27a0ec DK |
1532 | return -EINVAL; |
1533 | } | |
1534 | ||
1535 | if (n_blocks_count < o_blocks_count) { | |
12062ddd | 1536 | ext4_warning(sb, "can't shrink FS - resize aborted"); |
8f82f840 | 1537 | return -EINVAL; |
ac27a0ec DK |
1538 | } |
1539 | ||
1540 | /* Handle the remaining blocks in the last group only. */ | |
5f21b0e6 | 1541 | ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last); |
ac27a0ec DK |
1542 | |
1543 | if (last == 0) { | |
12062ddd | 1544 | ext4_warning(sb, "need to use ext2online to resize further"); |
ac27a0ec DK |
1545 | return -EPERM; |
1546 | } | |
1547 | ||
617ba13b | 1548 | add = EXT4_BLOCKS_PER_GROUP(sb) - last; |
ac27a0ec DK |
1549 | |
1550 | if (o_blocks_count + add < o_blocks_count) { | |
12062ddd | 1551 | ext4_warning(sb, "blocks_count overflow"); |
ac27a0ec DK |
1552 | return -EINVAL; |
1553 | } | |
1554 | ||
1555 | if (o_blocks_count + add > n_blocks_count) | |
1556 | add = n_blocks_count - o_blocks_count; | |
1557 | ||
1558 | if (o_blocks_count + add < n_blocks_count) | |
12062ddd | 1559 | ext4_warning(sb, "will only finish group (%llu blocks, %u new)", |
ac27a0ec DK |
1560 | o_blocks_count + add, add); |
1561 | ||
1562 | /* See if the device is actually as big as what was requested */ | |
2b2d6d01 | 1563 | bh = sb_bread(sb, o_blocks_count + add - 1); |
ac27a0ec | 1564 | if (!bh) { |
12062ddd | 1565 | ext4_warning(sb, "can't read last block, resize aborted"); |
ac27a0ec DK |
1566 | return -ENOSPC; |
1567 | } | |
1568 | brelse(bh); | |
1569 | ||
d89651c8 | 1570 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
ac27a0ec | 1571 | return err; |
617ba13b | 1572 | } /* ext4_group_extend */ |
19c5246d YY |
1573 | |
1574 | /* | |
1575 | * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count | |
1576 | * | |
1577 | * @sb: super block of the fs to be resized | |
1578 | * @n_blocks_count: the number of blocks resides in the resized fs | |
1579 | */ | |
1580 | int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) | |
1581 | { | |
1582 | struct ext4_new_flex_group_data *flex_gd = NULL; | |
1583 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1584 | struct ext4_super_block *es = sbi->s_es; | |
1585 | struct buffer_head *bh; | |
1586 | struct inode *resize_inode; | |
1587 | ext4_fsblk_t o_blocks_count; | |
1588 | ext4_group_t o_group; | |
1589 | ext4_group_t n_group; | |
a0ade1de | 1590 | ext4_grpblk_t offset, add; |
19c5246d YY |
1591 | unsigned long n_desc_blocks; |
1592 | unsigned long o_desc_blocks; | |
1593 | unsigned long desc_blocks; | |
1594 | int err = 0, flexbg_size = 1; | |
1595 | ||
1596 | o_blocks_count = ext4_blocks_count(es); | |
1597 | ||
1598 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1599 | ext4_msg(sb, KERN_DEBUG, "resizing filesystem from %llu " |
1600 | "to %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1601 | |
1602 | if (n_blocks_count < o_blocks_count) { | |
1603 | /* On-line shrinking not supported */ | |
1604 | ext4_warning(sb, "can't shrink FS - resize aborted"); | |
1605 | return -EINVAL; | |
1606 | } | |
1607 | ||
1608 | if (n_blocks_count == o_blocks_count) | |
1609 | /* Nothing need to do */ | |
1610 | return 0; | |
1611 | ||
1612 | ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset); | |
a0ade1de | 1613 | ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset); |
19c5246d YY |
1614 | |
1615 | n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) / | |
1616 | EXT4_DESC_PER_BLOCK(sb); | |
1617 | o_desc_blocks = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / | |
1618 | EXT4_DESC_PER_BLOCK(sb); | |
1619 | desc_blocks = n_desc_blocks - o_desc_blocks; | |
1620 | ||
1621 | if (desc_blocks && | |
1622 | (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE) || | |
1623 | le16_to_cpu(es->s_reserved_gdt_blocks) < desc_blocks)) { | |
1624 | ext4_warning(sb, "No reserved GDT blocks, can't resize"); | |
1625 | return -EPERM; | |
1626 | } | |
1627 | ||
1628 | resize_inode = ext4_iget(sb, EXT4_RESIZE_INO); | |
1629 | if (IS_ERR(resize_inode)) { | |
1630 | ext4_warning(sb, "Error opening resize inode"); | |
1631 | return PTR_ERR(resize_inode); | |
1632 | } | |
1633 | ||
1634 | /* See if the device is actually as big as what was requested */ | |
1635 | bh = sb_bread(sb, n_blocks_count - 1); | |
1636 | if (!bh) { | |
1637 | ext4_warning(sb, "can't read last block, resize aborted"); | |
1638 | return -ENOSPC; | |
1639 | } | |
1640 | brelse(bh); | |
1641 | ||
a0ade1de LC |
1642 | /* extend the last group */ |
1643 | if (n_group == o_group) | |
1644 | add = n_blocks_count - o_blocks_count; | |
1645 | else | |
1646 | add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1); | |
1647 | if (add > 0) { | |
19c5246d YY |
1648 | err = ext4_group_extend_no_check(sb, o_blocks_count, add); |
1649 | if (err) | |
1650 | goto out; | |
1651 | } | |
1652 | ||
1653 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && | |
1654 | es->s_log_groups_per_flex) | |
1655 | flexbg_size = 1 << es->s_log_groups_per_flex; | |
1656 | ||
1657 | o_blocks_count = ext4_blocks_count(es); | |
1658 | if (o_blocks_count == n_blocks_count) | |
1659 | goto out; | |
1660 | ||
1661 | flex_gd = alloc_flex_gd(flexbg_size); | |
1662 | if (flex_gd == NULL) { | |
1663 | err = -ENOMEM; | |
1664 | goto out; | |
1665 | } | |
1666 | ||
1667 | /* Add flex groups. Note that a regular group is a | |
1668 | * flex group with 1 group. | |
1669 | */ | |
1670 | while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count, | |
1671 | flexbg_size)) { | |
1672 | ext4_alloc_group_tables(sb, flex_gd, flexbg_size); | |
1673 | err = ext4_flex_group_add(sb, resize_inode, flex_gd); | |
1674 | if (unlikely(err)) | |
1675 | break; | |
1676 | } | |
1677 | ||
1678 | out: | |
1679 | if (flex_gd) | |
1680 | free_flex_gd(flex_gd); | |
1681 | ||
1682 | iput(resize_inode); | |
1683 | if (test_opt(sb, DEBUG)) | |
92b97816 TT |
1684 | ext4_msg(sb, KERN_DEBUG, "resized filesystem from %llu " |
1685 | "upto %llu blocks", o_blocks_count, n_blocks_count); | |
19c5246d YY |
1686 | return err; |
1687 | } |