Branch data Line data Source code
1 : : /*
2 : : * linux/fs/ext4/resize.c
3 : : *
4 : : * Support for resizing an ext4 filesystem while it is mounted.
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 : :
12 : : #define EXT4FS_DEBUG
13 : :
14 : : #include <linux/errno.h>
15 : : #include <linux/slab.h>
16 : :
17 : : #include "ext4_jbd2.h"
18 : :
19 : 0 : int ext4_resize_begin(struct super_block *sb)
20 : : {
21 : : int ret = 0;
22 : :
23 [ # # ]: 0 : if (!capable(CAP_SYS_RESOURCE))
24 : : return -EPERM;
25 : :
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 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
31 : 0 : ext4_warning(sb, "There are errors in the filesystem, "
32 : : "so online resizing is not allowed\n");
33 : 0 : return -EPERM;
34 : : }
35 : :
36 [ # # ]: 0 : if (test_and_set_bit_lock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags))
37 : : ret = -EBUSY;
38 : :
39 : 0 : return ret;
40 : : }
41 : :
42 : 0 : void ext4_resize_end(struct super_block *sb)
43 : : {
44 : 0 : clear_bit_unlock(EXT4_RESIZING, &EXT4_SB(sb)->s_resize_flags);
45 : 0 : smp_mb__after_clear_bit();
46 : 0 : }
47 : :
48 : 0 : static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
49 : : ext4_group_t group) {
50 : 0 : return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
51 : : EXT4_DESC_PER_BLOCK_BITS(sb);
52 : : }
53 : :
54 : : static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
55 : : ext4_group_t group) {
56 : : group = ext4_meta_bg_first_group(sb, group);
57 : : return ext4_group_first_block_no(sb, group);
58 : : }
59 : :
60 : 0 : static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
61 : : ext4_group_t group) {
62 : : ext4_grpblk_t overhead;
63 : 0 : overhead = ext4_bg_num_gdb(sb, group);
64 [ # # ]: 0 : if (ext4_bg_has_super(sb, group))
65 : 0 : overhead += 1 +
66 : 0 : le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
67 : 0 : return overhead;
68 : : }
69 : :
70 : : #define outside(b, first, last) ((b) < (first) || (b) >= (last))
71 : : #define inside(b, first, last) ((b) >= (first) && (b) < (last))
72 : :
73 : 0 : static int verify_group_input(struct super_block *sb,
74 : : struct ext4_new_group_data *input)
75 : : {
76 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
77 : 0 : struct ext4_super_block *es = sbi->s_es;
78 : : ext4_fsblk_t start = ext4_blocks_count(es);
79 : 0 : ext4_fsblk_t end = start + input->blocks_count;
80 : 0 : ext4_group_t group = input->group;
81 : 0 : ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
82 : : unsigned overhead;
83 : : ext4_fsblk_t metaend;
84 : : struct buffer_head *bh = NULL;
85 : : ext4_grpblk_t free_blocks_count, offset;
86 : : int err = -EINVAL;
87 : :
88 [ # # ]: 0 : if (group != sbi->s_groups_count) {
89 : 0 : ext4_warning(sb, "Cannot add at group %u (only %u groups)",
90 : : input->group, sbi->s_groups_count);
91 : 0 : return -EINVAL;
92 : : }
93 : :
94 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
95 : 0 : metaend = start + overhead;
96 : 0 : input->free_blocks_count = free_blocks_count =
97 : 0 : input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
98 : :
99 [ # # ]: 0 : if (test_opt(sb, DEBUG))
100 [ # # ]: 0 : printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
101 : : "(%d free, %u reserved)\n",
102 : 0 : ext4_bg_has_super(sb, input->group) ? "normal" :
103 : : "no-super", input->group, input->blocks_count,
104 : 0 : free_blocks_count, input->reserved_blocks);
105 : :
106 : 0 : ext4_get_group_no_and_offset(sb, start, NULL, &offset);
107 [ # # ]: 0 : if (offset != 0)
108 : 0 : ext4_warning(sb, "Last group not full");
109 [ # # ]: 0 : else if (input->reserved_blocks > input->blocks_count / 5)
110 : 0 : ext4_warning(sb, "Reserved blocks too high (%u)",
111 : : input->reserved_blocks);
112 [ # # ]: 0 : else if (free_blocks_count < 0)
113 : 0 : ext4_warning(sb, "Bad blocks count %u",
114 : : input->blocks_count);
115 [ # # ]: 0 : else if (!(bh = sb_bread(sb, end - 1)))
116 : 0 : ext4_warning(sb, "Cannot read last block (%llu)",
117 : : end - 1);
118 [ # # ][ # # ]: 0 : else if (outside(input->block_bitmap, start, end))
119 : 0 : ext4_warning(sb, "Block bitmap not in group (block %llu)",
120 : : (unsigned long long)input->block_bitmap);
121 [ # # ][ # # ]: 0 : else if (outside(input->inode_bitmap, start, end))
122 : 0 : ext4_warning(sb, "Inode bitmap not in group (block %llu)",
123 : : (unsigned long long)input->inode_bitmap);
124 [ # # ][ # # ]: 0 : else if (outside(input->inode_table, start, end) ||
[ # # ]
125 [ # # ]: 0 : outside(itend - 1, start, end))
126 : 0 : ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
127 : : (unsigned long long)input->inode_table, itend - 1);
128 [ # # ]: 0 : else if (input->inode_bitmap == input->block_bitmap)
129 : 0 : ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
130 : : (unsigned long long)input->block_bitmap);
131 [ # # ][ # # ]: 0 : else if (inside(input->block_bitmap, input->inode_table, itend))
132 : 0 : ext4_warning(sb, "Block bitmap (%llu) in inode table "
133 : : "(%llu-%llu)",
134 : : (unsigned long long)input->block_bitmap,
135 : : (unsigned long long)input->inode_table, itend - 1);
136 [ # # ][ # # ]: 0 : else if (inside(input->inode_bitmap, input->inode_table, itend))
137 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in inode table "
138 : : "(%llu-%llu)",
139 : : (unsigned long long)input->inode_bitmap,
140 : : (unsigned long long)input->inode_table, itend - 1);
141 [ # # ][ # # ]: 0 : else if (inside(input->block_bitmap, start, metaend))
142 : 0 : ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
143 : : (unsigned long long)input->block_bitmap,
144 : : start, metaend - 1);
145 [ # # ][ # # ]: 0 : else if (inside(input->inode_bitmap, start, metaend))
146 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
147 : : (unsigned long long)input->inode_bitmap,
148 : : start, metaend - 1);
149 [ # # ][ # # ]: 0 : else if (inside(input->inode_table, start, metaend) ||
[ # # ]
150 [ # # ]: 0 : inside(itend - 1, start, metaend))
151 : 0 : ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
152 : : "(%llu-%llu)",
153 : : (unsigned long long)input->inode_table,
154 : : itend - 1, start, metaend - 1);
155 : : else
156 : : err = 0;
157 : : brelse(bh);
158 : :
159 : 0 : return err;
160 : : }
161 : :
162 : : /*
163 : : * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
164 : : * group each time.
165 : : */
166 : : struct ext4_new_flex_group_data {
167 : : struct ext4_new_group_data *groups; /* new_group_data for groups
168 : : in the flex group */
169 : : __u16 *bg_flags; /* block group flags of groups
170 : : in @groups */
171 : : ext4_group_t count; /* number of groups in @groups
172 : : */
173 : : };
174 : :
175 : : /*
176 : : * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
177 : : * @flexbg_size.
178 : : *
179 : : * Returns NULL on failure otherwise address of the allocated structure.
180 : : */
181 : 0 : static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
182 : : {
183 : : struct ext4_new_flex_group_data *flex_gd;
184 : :
185 : : flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
186 [ # # ]: 0 : if (flex_gd == NULL)
187 : : goto out3;
188 : :
189 [ # # ]: 0 : if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data))
190 : : goto out2;
191 : 0 : flex_gd->count = flexbg_size;
192 : :
193 : 0 : flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
194 : : flexbg_size, GFP_NOFS);
195 [ # # ]: 0 : if (flex_gd->groups == NULL)
196 : : goto out2;
197 : :
198 : 0 : flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
199 [ # # ]: 0 : if (flex_gd->bg_flags == NULL)
200 : : goto out1;
201 : :
202 : : return flex_gd;
203 : :
204 : : out1:
205 : 0 : kfree(flex_gd->groups);
206 : : out2:
207 : 0 : kfree(flex_gd);
208 : : out3:
209 : : return NULL;
210 : : }
211 : :
212 : 0 : static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
213 : : {
214 : 0 : kfree(flex_gd->bg_flags);
215 : 0 : kfree(flex_gd->groups);
216 : 0 : kfree(flex_gd);
217 : 0 : }
218 : :
219 : : /*
220 : : * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
221 : : * and inode tables for a flex group.
222 : : *
223 : : * This function is used by 64bit-resize. Note that this function allocates
224 : : * group tables from the 1st group of groups contained by @flexgd, which may
225 : : * be a partial of a flex group.
226 : : *
227 : : * @sb: super block of fs to which the groups belongs
228 : : *
229 : : * Returns 0 on a successful allocation of the metadata blocks in the
230 : : * block group.
231 : : */
232 : 0 : static int ext4_alloc_group_tables(struct super_block *sb,
233 : : struct ext4_new_flex_group_data *flex_gd,
234 : : int flexbg_size)
235 : : {
236 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
237 : : ext4_fsblk_t start_blk;
238 : : ext4_fsblk_t last_blk;
239 : : ext4_group_t src_group;
240 : : ext4_group_t bb_index = 0;
241 : : ext4_group_t ib_index = 0;
242 : : ext4_group_t it_index = 0;
243 : : ext4_group_t group;
244 : : ext4_group_t last_group;
245 : : unsigned overhead;
246 [ # # ]: 0 : __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
247 : :
248 [ # # ][ # # ]: 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
249 : :
250 : 0 : src_group = group_data[0].group;
251 : 0 : last_group = src_group + flex_gd->count - 1;
252 : :
253 [ # # ][ # # ]: 0 : BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
254 : : (last_group & ~(flexbg_size - 1))));
255 : : next_group:
256 : 0 : group = group_data[0].group;
257 [ # # ]: 0 : if (src_group >= group_data[0].group + flex_gd->count)
258 : : return -ENOSPC;
259 : : start_blk = ext4_group_first_block_no(sb, src_group);
260 : 0 : last_blk = start_blk + group_data[src_group - group].blocks_count;
261 : :
262 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
263 : :
264 : 0 : start_blk += overhead;
265 : :
266 : : /* We collect contiguous blocks as much as possible. */
267 : 0 : src_group++;
268 [ # # ]: 0 : for (; src_group <= last_group; src_group++) {
269 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
270 [ # # ]: 0 : if (overhead == 0)
271 : 0 : last_blk += group_data[src_group - group].blocks_count;
272 : : else
273 : : break;
274 : : }
275 : :
276 : : /* Allocate block bitmaps */
277 [ # # ]: 0 : for (; bb_index < flex_gd->count; bb_index++) {
278 [ # # ]: 0 : if (start_blk >= last_blk)
279 : : goto next_group;
280 : 0 : group_data[bb_index].block_bitmap = start_blk++;
281 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
282 : 0 : group -= group_data[0].group;
283 : 0 : group_data[group].free_blocks_count--;
284 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
285 : : }
286 : :
287 : : /* Allocate inode bitmaps */
288 [ # # ]: 0 : for (; ib_index < flex_gd->count; ib_index++) {
289 [ # # ]: 0 : if (start_blk >= last_blk)
290 : : goto next_group;
291 : 0 : group_data[ib_index].inode_bitmap = start_blk++;
292 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
293 : 0 : group -= group_data[0].group;
294 : 0 : group_data[group].free_blocks_count--;
295 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
296 : : }
297 : :
298 : : /* Allocate inode tables */
299 [ # # ]: 0 : for (; it_index < flex_gd->count; it_index++) {
300 : 0 : unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
301 : : ext4_fsblk_t next_group_start;
302 : :
303 [ # # ]: 0 : if (start_blk + itb > last_blk)
304 : : goto next_group;
305 : 0 : group_data[it_index].inode_table = start_blk;
306 : 0 : group = ext4_get_group_number(sb, start_blk);
307 : 0 : next_group_start = ext4_group_first_block_no(sb, group + 1);
308 : 0 : group -= group_data[0].group;
309 : :
310 [ # # ]: 0 : if (start_blk + itb > next_group_start) {
311 : 0 : flex_gd->bg_flags[group + 1] &= uninit_mask;
312 : 0 : overhead = start_blk + itb - next_group_start;
313 : 0 : group_data[group + 1].free_blocks_count -= overhead;
314 : 0 : itb -= overhead;
315 : : }
316 : :
317 : 0 : group_data[group].free_blocks_count -= itb;
318 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
319 : 0 : start_blk += EXT4_SB(sb)->s_itb_per_group;
320 : : }
321 : :
322 [ # # ]: 0 : if (test_opt(sb, DEBUG)) {
323 : : int i;
324 : 0 : group = group_data[0].group;
325 : :
326 : 0 : printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
327 : : "%d groups, flexbg size is %d:\n", flex_gd->count,
328 : : flexbg_size);
329 : :
330 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
331 [ # # ]: 0 : printk(KERN_DEBUG "adding %s group %u: %u "
332 : : "blocks (%d free)\n",
333 : 0 : ext4_bg_has_super(sb, group + i) ? "normal" :
334 : : "no-super", group + i,
335 : 0 : group_data[i].blocks_count,
336 : : group_data[i].free_blocks_count);
337 : : }
338 : : }
339 : : return 0;
340 : : }
341 : :
342 : 0 : static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
343 : : ext4_fsblk_t blk)
344 : : {
345 : : struct buffer_head *bh;
346 : : int err;
347 : :
348 : : bh = sb_getblk(sb, blk);
349 [ # # ]: 0 : if (unlikely(!bh))
350 : : return ERR_PTR(-ENOMEM);
351 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh))) {
352 : : brelse(bh);
353 : : bh = ERR_PTR(err);
354 : : } else {
355 [ # # ]: 0 : memset(bh->b_data, 0, sb->s_blocksize);
356 : : set_buffer_uptodate(bh);
357 : : }
358 : :
359 : 0 : return bh;
360 : : }
361 : :
362 : : /*
363 : : * If we have fewer than thresh credits, extend by EXT4_MAX_TRANS_DATA.
364 : : * If that fails, restart the transaction & regain write access for the
365 : : * buffer head which is used for block_bitmap modifications.
366 : : */
367 : 0 : static int extend_or_restart_transaction(handle_t *handle, int thresh)
368 : : {
369 : : int err;
370 : :
371 [ # # ]: 0 : if (ext4_handle_has_enough_credits(handle, thresh))
372 : : return 0;
373 : :
374 : : err = ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA);
375 [ # # ]: 0 : if (err < 0)
376 : : return err;
377 [ # # ]: 0 : if (err) {
378 : : err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA);
379 [ # # ]: 0 : if (err)
380 : 0 : return err;
381 : : }
382 : :
383 : : return 0;
384 : : }
385 : :
386 : : /*
387 : : * set_flexbg_block_bitmap() mark @count blocks starting from @block used.
388 : : *
389 : : * Helper function for ext4_setup_new_group_blocks() which set .
390 : : *
391 : : * @sb: super block
392 : : * @handle: journal handle
393 : : * @flex_gd: flex group data
394 : : */
395 : 0 : static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
396 : : struct ext4_new_flex_group_data *flex_gd,
397 : : ext4_fsblk_t block, ext4_group_t count)
398 : : {
399 : : ext4_group_t count2;
400 : :
401 : : ext4_debug("mark blocks [%llu/%u] used\n", block, count);
402 [ # # ]: 0 : for (count2 = count; count > 0; count -= count2, block += count2) {
403 : : ext4_fsblk_t start;
404 : : struct buffer_head *bh;
405 : : ext4_group_t group;
406 : : int err;
407 : :
408 : 0 : group = ext4_get_group_number(sb, block);
409 : : start = ext4_group_first_block_no(sb, group);
410 : 0 : group -= flex_gd->groups[0].group;
411 : :
412 : 0 : count2 = EXT4_BLOCKS_PER_GROUP(sb) - (block - start);
413 [ # # ]: 0 : if (count2 > count)
414 : : count2 = count;
415 : :
416 [ # # ]: 0 : if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
417 [ # # ]: 0 : BUG_ON(flex_gd->count > 1);
418 : 0 : continue;
419 : : }
420 : :
421 : 0 : err = extend_or_restart_transaction(handle, 1);
422 [ # # ]: 0 : if (err)
423 : : return err;
424 : :
425 : 0 : bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
426 [ # # ]: 0 : if (unlikely(!bh))
427 : : return -ENOMEM;
428 : :
429 : 0 : err = ext4_journal_get_write_access(handle, bh);
430 [ # # ]: 0 : if (err)
431 : : return err;
432 : : ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
433 : : block - start, count2);
434 : 0 : ext4_set_bits(bh->b_data, block - start, count2);
435 : :
436 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
437 [ # # ]: 0 : if (unlikely(err))
438 : : return err;
439 : : brelse(bh);
440 : : }
441 : :
442 : : return 0;
443 : : }
444 : :
445 : : /*
446 : : * Set up the block and inode bitmaps, and the inode table for the new groups.
447 : : * This doesn't need to be part of the main transaction, since we are only
448 : : * changing blocks outside the actual filesystem. We still do journaling to
449 : : * ensure the recovery is correct in case of a failure just after resize.
450 : : * If any part of this fails, we simply abort the resize.
451 : : *
452 : : * setup_new_flex_group_blocks handles a flex group as follow:
453 : : * 1. copy super block and GDT, and initialize group tables if necessary.
454 : : * In this step, we only set bits in blocks bitmaps for blocks taken by
455 : : * super block and GDT.
456 : : * 2. allocate group tables in block bitmaps, that is, set bits in block
457 : : * bitmap for blocks taken by group tables.
458 : : */
459 : 0 : static int setup_new_flex_group_blocks(struct super_block *sb,
460 : : struct ext4_new_flex_group_data *flex_gd)
461 : : {
462 : 0 : int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
463 : : ext4_fsblk_t start;
464 : : ext4_fsblk_t block;
465 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
466 : 0 : struct ext4_super_block *es = sbi->s_es;
467 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
468 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
469 : : handle_t *handle;
470 : : ext4_group_t group, count;
471 : : struct buffer_head *bh = NULL;
472 : : int reserved_gdb, i, j, err = 0, err2;
473 : : int meta_bg;
474 : :
475 [ # # ][ # # ]: 0 : BUG_ON(!flex_gd->count || !group_data ||
[ # # ][ # # ]
476 : : group_data[0].group != sbi->s_groups_count);
477 : :
478 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
479 : 0 : meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
480 : :
481 : : /* This transaction may be extended/restarted along the way */
482 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
483 [ # # ]: 0 : if (IS_ERR(handle))
484 : 0 : return PTR_ERR(handle);
485 : :
486 : 0 : group = group_data[0].group;
487 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group++) {
488 : : unsigned long gdblocks;
489 : : ext4_grpblk_t overhead;
490 : :
491 : 0 : gdblocks = ext4_bg_num_gdb(sb, group);
492 : : start = ext4_group_first_block_no(sb, group);
493 : :
494 [ # # ][ # # ]: 0 : if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
495 : : goto handle_itb;
496 : :
497 [ # # ]: 0 : if (meta_bg == 1) {
498 : : ext4_group_t first_group;
499 : : first_group = ext4_meta_bg_first_group(sb, group);
500 [ # # ][ # # ]: 0 : if (first_group != group + 1 &&
501 : 0 : first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
502 : : goto handle_itb;
503 : : }
504 : :
505 : 0 : block = start + ext4_bg_has_super(sb, group);
506 : : /* Copy all of the GDT blocks into the backup in this group */
507 [ # # ]: 0 : for (j = 0; j < gdblocks; j++, block++) {
508 : : struct buffer_head *gdb;
509 : :
510 : : ext4_debug("update backup group %#04llx\n", block);
511 : 0 : err = extend_or_restart_transaction(handle, 1);
512 [ # # ]: 0 : if (err)
513 : : goto out;
514 : :
515 : : gdb = sb_getblk(sb, block);
516 [ # # ]: 0 : if (unlikely(!gdb)) {
517 : : err = -ENOMEM;
518 : : goto out;
519 : : }
520 : :
521 : 0 : err = ext4_journal_get_write_access(handle, gdb);
522 [ # # ]: 0 : if (err) {
523 : : brelse(gdb);
524 : : goto out;
525 : : }
526 : 0 : memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
527 : : gdb->b_size);
528 : : set_buffer_uptodate(gdb);
529 : :
530 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb);
531 [ # # ]: 0 : if (unlikely(err)) {
532 : : brelse(gdb);
533 : : goto out;
534 : : }
535 : : brelse(gdb);
536 : : }
537 : :
538 : : /* Zero out all of the reserved backup group descriptor
539 : : * table blocks
540 : : */
541 [ # # ]: 0 : if (ext4_bg_has_super(sb, group)) {
542 : 0 : err = sb_issue_zeroout(sb, gdblocks + start + 1,
543 : : reserved_gdb, GFP_NOFS);
544 [ # # ]: 0 : if (err)
545 : : goto out;
546 : : }
547 : :
548 : : handle_itb:
549 : : /* Initialize group tables of the grop @group */
550 [ # # ]: 0 : if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
551 : : goto handle_bb;
552 : :
553 : : /* Zero out all of the inode table blocks */
554 : 0 : block = group_data[i].inode_table;
555 : : ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
556 : : block, sbi->s_itb_per_group);
557 : 0 : err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
558 : : GFP_NOFS);
559 [ # # ]: 0 : if (err)
560 : : goto out;
561 : :
562 : : handle_bb:
563 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
564 : : goto handle_ib;
565 : :
566 : : /* Initialize block bitmap of the @group */
567 : 0 : block = group_data[i].block_bitmap;
568 : 0 : err = extend_or_restart_transaction(handle, 1);
569 [ # # ]: 0 : if (err)
570 : : goto out;
571 : :
572 : 0 : bh = bclean(handle, sb, block);
573 [ # # ]: 0 : if (IS_ERR(bh)) {
574 : : err = PTR_ERR(bh);
575 : 0 : goto out;
576 : : }
577 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
578 [ # # ]: 0 : if (overhead != 0) {
579 : : ext4_debug("mark backup superblock %#04llx (+0)\n",
580 : : start);
581 : 0 : ext4_set_bits(bh->b_data, 0, overhead);
582 : : }
583 : 0 : ext4_mark_bitmap_end(group_data[i].blocks_count,
584 : 0 : sb->s_blocksize * 8, bh->b_data);
585 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
586 [ # # ]: 0 : if (err)
587 : : goto out;
588 : : brelse(bh);
589 : :
590 : : handle_ib:
591 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
592 : 0 : continue;
593 : :
594 : : /* Initialize inode bitmap of the @group */
595 : 0 : block = group_data[i].inode_bitmap;
596 : 0 : err = extend_or_restart_transaction(handle, 1);
597 [ # # ]: 0 : if (err)
598 : : goto out;
599 : : /* Mark unused entries in inode bitmap used */
600 : 0 : bh = bclean(handle, sb, block);
601 [ # # ]: 0 : if (IS_ERR(bh)) {
602 : : err = PTR_ERR(bh);
603 : 0 : goto out;
604 : : }
605 : :
606 : 0 : ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
607 : 0 : sb->s_blocksize * 8, bh->b_data);
608 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
609 [ # # ]: 0 : if (err)
610 : : goto out;
611 : : brelse(bh);
612 : : }
613 : : bh = NULL;
614 : :
615 : : /* Mark group tables in block bitmap */
616 [ # # ]: 0 : for (j = 0; j < GROUP_TABLE_COUNT; j++) {
617 : 0 : count = group_table_count[j];
618 : 0 : start = (&group_data[0].block_bitmap)[j];
619 : : block = start;
620 [ # # ]: 0 : for (i = 1; i < flex_gd->count; i++) {
621 : 0 : block += group_table_count[j];
622 [ # # ]: 0 : if (block == (&group_data[i].block_bitmap)[j]) {
623 : 0 : count += group_table_count[j];
624 : 0 : continue;
625 : : }
626 : 0 : err = set_flexbg_block_bitmap(sb, handle,
627 : : flex_gd, start, count);
628 [ # # ]: 0 : if (err)
629 : : goto out;
630 : : count = group_table_count[j];
631 : 0 : start = (&group_data[i].block_bitmap)[j];
632 : : block = start;
633 : : }
634 : :
635 [ # # ]: 0 : if (count) {
636 : 0 : err = set_flexbg_block_bitmap(sb, handle,
637 : : flex_gd, start, count);
638 [ # # ]: 0 : if (err)
639 : : goto out;
640 : : }
641 : : }
642 : :
643 : : out:
644 : : brelse(bh);
645 : 0 : err2 = ext4_journal_stop(handle);
646 [ # # ]: 0 : if (err2 && !err)
647 : : err = err2;
648 : :
649 : 0 : return err;
650 : : }
651 : :
652 : : /*
653 : : * Iterate through the groups which hold BACKUP superblock/GDT copies in an
654 : : * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before
655 : : * calling this for the first time. In a sparse filesystem it will be the
656 : : * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
657 : : * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
658 : : */
659 : 0 : static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
660 : : unsigned *five, unsigned *seven)
661 : : {
662 : : unsigned *min = three;
663 : : int mult = 3;
664 : : unsigned ret;
665 : :
666 [ # # ][ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
[ # # ]
667 : : EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
668 : 0 : ret = *min;
669 : 0 : *min += 1;
670 : : return ret;
671 : : }
672 : :
673 [ # # ][ # # ]: 0 : if (*five < *min) {
674 : : min = five;
675 : : mult = 5;
676 : : }
677 [ # # ][ # # ]: 0 : if (*seven < *min) {
[ # # ]
678 : : min = seven;
679 : : mult = 7;
680 : : }
681 : :
682 : 0 : ret = *min;
683 : 0 : *min *= mult;
684 : :
685 : : return ret;
686 : : }
687 : :
688 : : /*
689 : : * Check that all of the backup GDT blocks are held in the primary GDT block.
690 : : * It is assumed that they are stored in group order. Returns the number of
691 : : * groups in current filesystem that have BACKUPS, or -ve error code.
692 : : */
693 : 0 : static int verify_reserved_gdb(struct super_block *sb,
694 : : ext4_group_t end,
695 : : struct buffer_head *primary)
696 : : {
697 : 0 : const ext4_fsblk_t blk = primary->b_blocknr;
698 : 0 : unsigned three = 1;
699 : 0 : unsigned five = 5;
700 : 0 : unsigned seven = 7;
701 : : unsigned grp;
702 : 0 : __le32 *p = (__le32 *)primary->b_data;
703 : : int gdbackups = 0;
704 : :
705 [ # # ]: 0 : while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
706 [ # # ]: 0 : if (le32_to_cpu(*p++) !=
707 : 0 : grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
708 : 0 : ext4_warning(sb, "reserved GDT %llu"
709 : : " missing grp %d (%llu)",
710 : : blk, grp,
711 : : grp *
712 : : (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
713 : : blk);
714 : 0 : return -EINVAL;
715 : : }
716 [ # # ]: 0 : if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
717 : : return -EFBIG;
718 : : }
719 : :
720 : : return gdbackups;
721 : : }
722 : :
723 : : /*
724 : : * Called when we need to bring a reserved group descriptor table block into
725 : : * use from the resize inode. The primary copy of the new GDT block currently
726 : : * is an indirect block (under the double indirect block in the resize inode).
727 : : * The new backup GDT blocks will be stored as leaf blocks in this indirect
728 : : * block, in group order. Even though we know all the block numbers we need,
729 : : * we check to ensure that the resize inode has actually reserved these blocks.
730 : : *
731 : : * Don't need to update the block bitmaps because the blocks are still in use.
732 : : *
733 : : * We get all of the error cases out of the way, so that we are sure to not
734 : : * fail once we start modifying the data on disk, because JBD has no rollback.
735 : : */
736 : 0 : static int add_new_gdb(handle_t *handle, struct inode *inode,
737 : : ext4_group_t group)
738 : : {
739 : 0 : struct super_block *sb = inode->i_sb;
740 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
741 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
742 : 0 : ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
743 : : struct buffer_head **o_group_desc, **n_group_desc;
744 : : struct buffer_head *dind;
745 : : struct buffer_head *gdb_bh;
746 : : int gdbackups;
747 : : struct ext4_iloc iloc;
748 : : __le32 *data;
749 : : int err;
750 : :
751 [ # # ]: 0 : if (test_opt(sb, DEBUG))
752 : 0 : printk(KERN_DEBUG
753 : : "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
754 : : gdb_num);
755 : :
756 : : /*
757 : : * If we are not using the primary superblock/GDT copy don't resize,
758 : : * because the user tools have no way of handling this. Probably a
759 : : * bad time to do it anyways.
760 : : */
761 [ # # ]: 0 : if (EXT4_SB(sb)->s_sbh->b_blocknr !=
762 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
763 : 0 : ext4_warning(sb, "won't resize using backup superblock at %llu",
764 : : (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
765 : 0 : return -EPERM;
766 : : }
767 : :
768 : : gdb_bh = sb_bread(sb, gdblock);
769 [ # # ]: 0 : if (!gdb_bh)
770 : : return -EIO;
771 : :
772 : 0 : gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
773 [ # # ]: 0 : if (gdbackups < 0) {
774 : : err = gdbackups;
775 : : goto exit_bh;
776 : : }
777 : :
778 : : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
779 : 0 : dind = sb_bread(sb, le32_to_cpu(*data));
780 [ # # ]: 0 : if (!dind) {
781 : : err = -EIO;
782 : : goto exit_bh;
783 : : }
784 : :
785 : 0 : data = (__le32 *)dind->b_data;
786 [ # # ]: 0 : if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
787 : 0 : ext4_warning(sb, "new group %u GDT block %llu not reserved",
788 : : group, gdblock);
789 : : err = -EINVAL;
790 : 0 : goto exit_dind;
791 : : }
792 : :
793 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
794 [ # # ]: 0 : if (unlikely(err))
795 : : goto exit_dind;
796 : :
797 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
798 [ # # ]: 0 : if (unlikely(err))
799 : : goto exit_dind;
800 : :
801 : 0 : err = ext4_journal_get_write_access(handle, dind);
802 [ # # ]: 0 : if (unlikely(err))
803 [ # # ]: 0 : ext4_std_error(sb, err);
804 : :
805 : : /* ext4_reserve_inode_write() gets a reference on the iloc */
806 : 0 : err = ext4_reserve_inode_write(handle, inode, &iloc);
807 [ # # ]: 0 : if (unlikely(err))
808 : : goto exit_dind;
809 : :
810 : 0 : n_group_desc = ext4_kvmalloc((gdb_num + 1) *
811 : : sizeof(struct buffer_head *),
812 : : GFP_NOFS);
813 [ # # ]: 0 : if (!n_group_desc) {
814 : : err = -ENOMEM;
815 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
816 : : gdb_num + 1);
817 : 0 : goto exit_inode;
818 : : }
819 : :
820 : : /*
821 : : * Finally, we have all of the possible failures behind us...
822 : : *
823 : : * Remove new GDT block from inode double-indirect block and clear out
824 : : * the new GDT block for use (which also "frees" the backup GDT blocks
825 : : * from the reserved inode). We don't need to change the bitmaps for
826 : : * these blocks, because they are marked as in-use from being in the
827 : : * reserved inode, and will become GDT blocks (primary and backup).
828 : : */
829 : 0 : data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
830 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, dind);
831 [ # # ]: 0 : if (unlikely(err)) {
832 [ # # ]: 0 : ext4_std_error(sb, err);
833 : : goto exit_inode;
834 : : }
835 : 0 : inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >> 9;
836 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
837 [ # # ]: 0 : memset(gdb_bh->b_data, 0, sb->s_blocksize);
838 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
839 [ # # ]: 0 : if (unlikely(err)) {
840 [ # # ]: 0 : ext4_std_error(sb, err);
841 : : goto exit_inode;
842 : : }
843 : : brelse(dind);
844 : :
845 : 0 : o_group_desc = EXT4_SB(sb)->s_group_desc;
846 : 0 : memcpy(n_group_desc, o_group_desc,
847 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
848 : 0 : n_group_desc[gdb_num] = gdb_bh;
849 : 0 : EXT4_SB(sb)->s_group_desc = n_group_desc;
850 : 0 : EXT4_SB(sb)->s_gdb_count++;
851 : 0 : ext4_kvfree(o_group_desc);
852 : :
853 : : le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
854 : 0 : err = ext4_handle_dirty_super(handle, sb);
855 [ # # ]: 0 : if (err)
856 [ # # ]: 0 : ext4_std_error(sb, err);
857 : :
858 : 0 : return err;
859 : :
860 : : exit_inode:
861 : 0 : ext4_kvfree(n_group_desc);
862 : 0 : brelse(iloc.bh);
863 : : exit_dind:
864 : : brelse(dind);
865 : : exit_bh:
866 : : brelse(gdb_bh);
867 : :
868 : : ext4_debug("leaving with error %d\n", err);
869 : 0 : return err;
870 : : }
871 : :
872 : : /*
873 : : * add_new_gdb_meta_bg is the sister of add_new_gdb.
874 : : */
875 : 0 : static int add_new_gdb_meta_bg(struct super_block *sb,
876 : : handle_t *handle, ext4_group_t group) {
877 : : ext4_fsblk_t gdblock;
878 : : struct buffer_head *gdb_bh;
879 : : struct buffer_head **o_group_desc, **n_group_desc;
880 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
881 : : int err;
882 : :
883 : 0 : gdblock = ext4_meta_bg_first_block_no(sb, group) +
884 : 0 : ext4_bg_has_super(sb, group);
885 : : gdb_bh = sb_bread(sb, gdblock);
886 [ # # ]: 0 : if (!gdb_bh)
887 : : return -EIO;
888 : 0 : n_group_desc = ext4_kvmalloc((gdb_num + 1) *
889 : : sizeof(struct buffer_head *),
890 : : GFP_NOFS);
891 [ # # ]: 0 : if (!n_group_desc) {
892 : : err = -ENOMEM;
893 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
894 : : gdb_num + 1);
895 : 0 : return err;
896 : : }
897 : :
898 : 0 : o_group_desc = EXT4_SB(sb)->s_group_desc;
899 : 0 : memcpy(n_group_desc, o_group_desc,
900 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
901 : 0 : n_group_desc[gdb_num] = gdb_bh;
902 : 0 : EXT4_SB(sb)->s_group_desc = n_group_desc;
903 : 0 : EXT4_SB(sb)->s_gdb_count++;
904 : 0 : ext4_kvfree(o_group_desc);
905 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
906 [ # # ]: 0 : if (unlikely(err))
907 : : brelse(gdb_bh);
908 : 0 : return err;
909 : : }
910 : :
911 : : /*
912 : : * Called when we are adding a new group which has a backup copy of each of
913 : : * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
914 : : * We need to add these reserved backup GDT blocks to the resize inode, so
915 : : * that they are kept for future resizing and not allocated to files.
916 : : *
917 : : * Each reserved backup GDT block will go into a different indirect block.
918 : : * The indirect blocks are actually the primary reserved GDT blocks,
919 : : * so we know in advance what their block numbers are. We only get the
920 : : * double-indirect block to verify it is pointing to the primary reserved
921 : : * GDT blocks so we don't overwrite a data block by accident. The reserved
922 : : * backup GDT blocks are stored in their reserved primary GDT block.
923 : : */
924 : 0 : static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
925 : : ext4_group_t group)
926 : : {
927 : 0 : struct super_block *sb = inode->i_sb;
928 : 0 : int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
929 : : struct buffer_head **primary;
930 : : struct buffer_head *dind;
931 : : struct ext4_iloc iloc;
932 : : ext4_fsblk_t blk;
933 : : __le32 *data, *end;
934 : : int gdbackups = 0;
935 : : int res, i;
936 : : int err;
937 : :
938 : 0 : primary = kmalloc(reserved_gdb * sizeof(*primary), GFP_NOFS);
939 [ # # ]: 0 : if (!primary)
940 : : return -ENOMEM;
941 : :
942 : : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
943 : 0 : dind = sb_bread(sb, le32_to_cpu(*data));
944 [ # # ]: 0 : if (!dind) {
945 : : err = -EIO;
946 : : goto exit_free;
947 : : }
948 : :
949 : 0 : blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
950 : 0 : data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
951 : 0 : EXT4_ADDR_PER_BLOCK(sb));
952 : 0 : end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
953 : :
954 : : /* Get each reserved primary GDT block and verify it holds backups */
955 [ # # ]: 0 : for (res = 0; res < reserved_gdb; res++, blk++) {
956 [ # # ]: 0 : if (le32_to_cpu(*data) != blk) {
957 : 0 : ext4_warning(sb, "reserved block %llu"
958 : : " not at offset %ld",
959 : : blk,
960 : : (long)(data - (__le32 *)dind->b_data));
961 : : err = -EINVAL;
962 : 0 : goto exit_bh;
963 : : }
964 : 0 : primary[res] = sb_bread(sb, blk);
965 [ # # ]: 0 : if (!primary[res]) {
966 : : err = -EIO;
967 : : goto exit_bh;
968 : : }
969 : 0 : gdbackups = verify_reserved_gdb(sb, group, primary[res]);
970 [ # # ]: 0 : if (gdbackups < 0) {
971 : 0 : brelse(primary[res]);
972 : : err = gdbackups;
973 : 0 : goto exit_bh;
974 : : }
975 [ # # ]: 0 : if (++data >= end)
976 : 0 : data = (__le32 *)dind->b_data;
977 : : }
978 : :
979 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
980 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, primary[i])))
981 : : goto exit_bh;
982 : : }
983 : :
984 [ # # ]: 0 : if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
985 : : goto exit_bh;
986 : :
987 : : /*
988 : : * Finally we can add each of the reserved backup GDT blocks from
989 : : * the new group to its reserved primary GDT block.
990 : : */
991 : 0 : blk = group * EXT4_BLOCKS_PER_GROUP(sb);
992 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
993 : : int err2;
994 : 0 : data = (__le32 *)primary[i]->b_data;
995 : : /* printk("reserving backup %lu[%u] = %lu\n",
996 : : primary[i]->b_blocknr, gdbackups,
997 : : blk + primary[i]->b_blocknr); */
998 : 0 : data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
999 : 0 : err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1000 [ # # ]: 0 : if (!err)
1001 : : err = err2;
1002 : : }
1003 : 0 : inode->i_blocks += reserved_gdb * sb->s_blocksize >> 9;
1004 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
1005 : :
1006 : : exit_bh:
1007 [ # # ]: 0 : while (--res >= 0)
1008 : 0 : brelse(primary[res]);
1009 : : brelse(dind);
1010 : :
1011 : : exit_free:
1012 : 0 : kfree(primary);
1013 : :
1014 : 0 : return err;
1015 : : }
1016 : :
1017 : : /*
1018 : : * Update the backup copies of the ext4 metadata. These don't need to be part
1019 : : * of the main resize transaction, because e2fsck will re-write them if there
1020 : : * is a problem (basically only OOM will cause a problem). However, we
1021 : : * _should_ update the backups if possible, in case the primary gets trashed
1022 : : * for some reason and we need to run e2fsck from a backup superblock. The
1023 : : * important part is that the new block and inode counts are in the backup
1024 : : * superblocks, and the location of the new group metadata in the GDT backups.
1025 : : *
1026 : : * We do not need take the s_resize_lock for this, because these
1027 : : * blocks are not otherwise touched by the filesystem code when it is
1028 : : * mounted. We don't need to worry about last changing from
1029 : : * sbi->s_groups_count, because the worst that can happen is that we
1030 : : * do not copy the full number of backups at this time. The resize
1031 : : * which changed s_groups_count will backup again.
1032 : : */
1033 : 0 : static void update_backups(struct super_block *sb, int blk_off, char *data,
1034 : : int size, int meta_bg)
1035 : : {
1036 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1037 : : ext4_group_t last;
1038 : 0 : const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1039 : 0 : unsigned three = 1;
1040 : 0 : unsigned five = 5;
1041 : 0 : unsigned seven = 7;
1042 : : ext4_group_t group = 0;
1043 : 0 : int rest = sb->s_blocksize - size;
1044 : : handle_t *handle;
1045 : : int err = 0, err2;
1046 : :
1047 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1048 [ # # ]: 0 : if (IS_ERR(handle)) {
1049 : : group = 1;
1050 : : err = PTR_ERR(handle);
1051 : 0 : goto exit_err;
1052 : : }
1053 : :
1054 [ # # ]: 0 : if (meta_bg == 0) {
1055 : : group = ext4_list_backups(sb, &three, &five, &seven);
1056 : 0 : last = sbi->s_groups_count;
1057 : : } else {
1058 : : group = ext4_meta_bg_first_group(sb, group) + 1;
1059 : 0 : last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1060 : : }
1061 : :
1062 [ # # ]: 0 : while (group < sbi->s_groups_count) {
1063 : : struct buffer_head *bh;
1064 : : ext4_fsblk_t backup_block;
1065 : :
1066 : : /* Out of journal space, and can't get more - abort - so sad */
1067 [ # # ][ # # ]: 0 : if (ext4_handle_valid(handle) &&
1068 [ # # ]: 0 : handle->h_buffer_credits == 0 &&
1069 [ # # ]: 0 : ext4_journal_extend(handle, EXT4_MAX_TRANS_DATA) &&
1070 : : (err = ext4_journal_restart(handle, EXT4_MAX_TRANS_DATA)))
1071 : : break;
1072 : :
1073 [ # # ]: 0 : if (meta_bg == 0)
1074 : 0 : backup_block = group * bpg + blk_off;
1075 : : else
1076 : 0 : backup_block = (ext4_group_first_block_no(sb, group) +
1077 : 0 : ext4_bg_has_super(sb, group));
1078 : :
1079 : : bh = sb_getblk(sb, backup_block);
1080 [ # # ]: 0 : if (unlikely(!bh)) {
1081 : : err = -ENOMEM;
1082 : : break;
1083 : : }
1084 : : ext4_debug("update metadata backup %llu(+%llu)\n",
1085 : : backup_block, backup_block -
1086 : : ext4_group_first_block_no(sb, group));
1087 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh)))
1088 : : break;
1089 : : lock_buffer(bh);
1090 : 0 : memcpy(bh->b_data, data, size);
1091 [ # # ]: 0 : if (rest)
1092 [ # # ]: 0 : memset(bh->b_data + size, 0, rest);
1093 : : set_buffer_uptodate(bh);
1094 : 0 : unlock_buffer(bh);
1095 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
1096 [ # # ]: 0 : if (unlikely(err))
1097 [ # # ]: 0 : ext4_std_error(sb, err);
1098 : : brelse(bh);
1099 : :
1100 [ # # ]: 0 : if (meta_bg == 0)
1101 : : group = ext4_list_backups(sb, &three, &five, &seven);
1102 [ # # ]: 0 : else if (group == last)
1103 : : break;
1104 : : else
1105 : : group = last;
1106 : : }
1107 [ # # ][ # # ]: 0 : if ((err2 = ext4_journal_stop(handle)) && !err)
1108 : : err = err2;
1109 : :
1110 : : /*
1111 : : * Ugh! Need to have e2fsck write the backup copies. It is too
1112 : : * late to revert the resize, we shouldn't fail just because of
1113 : : * the backup copies (they are only needed in case of corruption).
1114 : : *
1115 : : * However, if we got here we have a journal problem too, so we
1116 : : * can't really start a transaction to mark the superblock.
1117 : : * Chicken out and just set the flag on the hope it will be written
1118 : : * to disk, and if not - we will simply wait until next fsck.
1119 : : */
1120 : : exit_err:
1121 [ # # ]: 0 : if (err) {
1122 : 0 : ext4_warning(sb, "can't update backup for group %u (err %d), "
1123 : : "forcing fsck on next reboot", group, err);
1124 : 0 : sbi->s_mount_state &= ~EXT4_VALID_FS;
1125 : 0 : sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1126 : 0 : mark_buffer_dirty(sbi->s_sbh);
1127 : : }
1128 : 0 : }
1129 : :
1130 : : /*
1131 : : * ext4_add_new_descs() adds @count group descriptor of groups
1132 : : * starting at @group
1133 : : *
1134 : : * @handle: journal handle
1135 : : * @sb: super block
1136 : : * @group: the group no. of the first group desc to be added
1137 : : * @resize_inode: the resize inode
1138 : : * @count: number of group descriptors to be added
1139 : : */
1140 : 0 : static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1141 : : ext4_group_t group, struct inode *resize_inode,
1142 : : ext4_group_t count)
1143 : : {
1144 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1145 : 0 : struct ext4_super_block *es = sbi->s_es;
1146 : : struct buffer_head *gdb_bh;
1147 : : int i, gdb_off, gdb_num, err = 0;
1148 : : int meta_bg;
1149 : :
1150 : 0 : meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1151 [ # # ]: 0 : for (i = 0; i < count; i++, group++) {
1152 : 0 : int reserved_gdb = ext4_bg_has_super(sb, group) ?
1153 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1154 : :
1155 : 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1156 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1157 : :
1158 : : /*
1159 : : * We will only either add reserved group blocks to a backup group
1160 : : * or remove reserved blocks for the first group in a new group block.
1161 : : * Doing both would be mean more complex code, and sane people don't
1162 : : * use non-sparse filesystems anymore. This is already checked above.
1163 : : */
1164 [ # # ]: 0 : if (gdb_off) {
1165 : 0 : gdb_bh = sbi->s_group_desc[gdb_num];
1166 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
1167 : :
1168 [ # # ][ # # ]: 0 : if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1169 : 0 : err = reserve_backup_gdb(handle, resize_inode, group);
1170 [ # # ]: 0 : } else if (meta_bg != 0) {
1171 : 0 : err = add_new_gdb_meta_bg(sb, handle, group);
1172 : : } else {
1173 : 0 : err = add_new_gdb(handle, resize_inode, group);
1174 : : }
1175 [ # # ]: 0 : if (err)
1176 : : break;
1177 : : }
1178 : 0 : return err;
1179 : : }
1180 : :
1181 : 0 : static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1182 : : {
1183 : : struct buffer_head *bh = sb_getblk(sb, block);
1184 [ # # ]: 0 : if (unlikely(!bh))
1185 : : return NULL;
1186 [ # # ]: 0 : if (!bh_uptodate_or_lock(bh)) {
1187 [ # # ]: 0 : if (bh_submit_read(bh) < 0) {
1188 : : brelse(bh);
1189 : : return NULL;
1190 : : }
1191 : : }
1192 : :
1193 : 0 : return bh;
1194 : : }
1195 : :
1196 : 0 : static int ext4_set_bitmap_checksums(struct super_block *sb,
1197 : : ext4_group_t group,
1198 : : struct ext4_group_desc *gdp,
1199 : : struct ext4_new_group_data *group_data)
1200 : : {
1201 : : struct buffer_head *bh;
1202 : :
1203 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
1204 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1205 : : return 0;
1206 : :
1207 : 0 : bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1208 [ # # ]: 0 : if (!bh)
1209 : : return -EIO;
1210 : 0 : ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
1211 : 0 : EXT4_INODES_PER_GROUP(sb) / 8);
1212 : : brelse(bh);
1213 : :
1214 : 0 : bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1215 [ # # ]: 0 : if (!bh)
1216 : : return -EIO;
1217 : 0 : ext4_block_bitmap_csum_set(sb, group, gdp, bh);
1218 : : brelse(bh);
1219 : :
1220 : : return 0;
1221 : : }
1222 : :
1223 : : /*
1224 : : * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
1225 : : */
1226 : 0 : static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1227 : : struct ext4_new_flex_group_data *flex_gd)
1228 : : {
1229 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1230 : : struct ext4_group_desc *gdp;
1231 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1232 : : struct buffer_head *gdb_bh;
1233 : : ext4_group_t group;
1234 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
1235 : : int i, gdb_off, gdb_num, err = 0;
1236 : :
1237 : :
1238 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1239 : 0 : group = group_data->group;
1240 : :
1241 : 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1242 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1243 : :
1244 : : /*
1245 : : * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
1246 : : */
1247 : 0 : gdb_bh = sbi->s_group_desc[gdb_num];
1248 : : /* Update group descriptor block for new group */
1249 : 0 : gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1250 : 0 : gdb_off * EXT4_DESC_SIZE(sb));
1251 : :
1252 [ # # ]: 0 : memset(gdp, 0, EXT4_DESC_SIZE(sb));
1253 : 0 : ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1254 : 0 : ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1255 : 0 : err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
1256 [ # # ]: 0 : if (err) {
1257 [ # # ]: 0 : ext4_std_error(sb, err);
1258 : : break;
1259 : : }
1260 : :
1261 : 0 : ext4_inode_table_set(sb, gdp, group_data->inode_table);
1262 : 0 : ext4_free_group_clusters_set(sb, gdp,
1263 : 0 : EXT4_NUM_B2C(sbi, group_data->free_blocks_count));
1264 : 0 : ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1265 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb))
1266 : 0 : ext4_itable_unused_set(sb, gdp,
1267 : 0 : EXT4_INODES_PER_GROUP(sb));
1268 : 0 : gdp->bg_flags = cpu_to_le16(*bg_flags);
1269 : 0 : ext4_group_desc_csum_set(sb, group, gdp);
1270 : :
1271 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1272 [ # # ]: 0 : if (unlikely(err)) {
1273 [ # # ]: 0 : ext4_std_error(sb, err);
1274 : : break;
1275 : : }
1276 : :
1277 : : /*
1278 : : * We can allocate memory for mb_alloc based on the new group
1279 : : * descriptor
1280 : : */
1281 : 0 : err = ext4_mb_add_groupinfo(sb, group, gdp);
1282 [ # # ]: 0 : if (err)
1283 : : break;
1284 : : }
1285 : 0 : return err;
1286 : : }
1287 : :
1288 : : /*
1289 : : * ext4_update_super() updates the super block so that the newly added
1290 : : * groups can be seen by the filesystem.
1291 : : *
1292 : : * @sb: super block
1293 : : * @flex_gd: new added groups
1294 : : */
1295 : 0 : static void ext4_update_super(struct super_block *sb,
1296 : : struct ext4_new_flex_group_data *flex_gd)
1297 : : {
1298 : : ext4_fsblk_t blocks_count = 0;
1299 : : ext4_fsblk_t free_blocks = 0;
1300 : : ext4_fsblk_t reserved_blocks = 0;
1301 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1302 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1303 : 0 : struct ext4_super_block *es = sbi->s_es;
1304 : : int i;
1305 : :
1306 [ # # ][ # # ]: 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
1307 : : /*
1308 : : * Make the new blocks and inodes valid next. We do this before
1309 : : * increasing the group count so that once the group is enabled,
1310 : : * all of its blocks and inodes are already valid.
1311 : : *
1312 : : * We always allocate group-by-group, then block-by-block or
1313 : : * inode-by-inode within a group, so enabling these
1314 : : * blocks/inodes before the group is live won't actually let us
1315 : : * allocate the new space yet.
1316 : : */
1317 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
1318 : 0 : blocks_count += group_data[i].blocks_count;
1319 : 0 : free_blocks += group_data[i].free_blocks_count;
1320 : : }
1321 : :
1322 : 0 : reserved_blocks = ext4_r_blocks_count(es) * 100;
1323 : 0 : reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1324 : 0 : reserved_blocks *= blocks_count;
1325 : 0 : do_div(reserved_blocks, 100);
1326 : :
1327 : 0 : ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1328 : 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1329 : 0 : le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1330 : 0 : flex_gd->count);
1331 : 0 : le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1332 : 0 : flex_gd->count);
1333 : :
1334 : : ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1335 : : /*
1336 : : * We need to protect s_groups_count against other CPUs seeing
1337 : : * inconsistent state in the superblock.
1338 : : *
1339 : : * The precise rules we use are:
1340 : : *
1341 : : * * Writers must perform a smp_wmb() after updating all
1342 : : * dependent data and before modifying the groups count
1343 : : *
1344 : : * * Readers must perform an smp_rmb() after reading the groups
1345 : : * count and before reading any dependent data.
1346 : : *
1347 : : * NB. These rules can be relaxed when checking the group count
1348 : : * while freeing data, as we can only allocate from a block
1349 : : * group after serialising against the group count, and we can
1350 : : * only then free after serialising in turn against that
1351 : : * allocation.
1352 : : */
1353 : 0 : smp_wmb();
1354 : :
1355 : : /* Update the global fs size fields */
1356 : 0 : sbi->s_groups_count += flex_gd->count;
1357 : 0 : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1358 : : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1359 : :
1360 : : /* Update the reserved block counts only once the new group is
1361 : : * active. */
1362 : 0 : ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1363 : : reserved_blocks);
1364 : :
1365 : : /* Update the free space counts */
1366 : 0 : percpu_counter_add(&sbi->s_freeclusters_counter,
1367 : 0 : EXT4_NUM_B2C(sbi, free_blocks));
1368 : 0 : percpu_counter_add(&sbi->s_freeinodes_counter,
1369 : 0 : EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1370 : :
1371 : : ext4_debug("free blocks count %llu",
1372 : : percpu_counter_read(&sbi->s_freeclusters_counter));
1373 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb,
1374 [ # # ]: 0 : EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
1375 : 0 : sbi->s_log_groups_per_flex) {
1376 : : ext4_group_t flex_group;
1377 : 0 : flex_group = ext4_flex_group(sbi, group_data[0].group);
1378 : 0 : atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1379 : 0 : &sbi->s_flex_groups[flex_group].free_clusters);
1380 : 0 : atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1381 : 0 : &sbi->s_flex_groups[flex_group].free_inodes);
1382 : : }
1383 : :
1384 : : /*
1385 : : * Update the fs overhead information
1386 : : */
1387 : 0 : ext4_calculate_overhead(sb);
1388 : :
1389 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1390 : 0 : printk(KERN_DEBUG "EXT4-fs: added group %u:"
1391 : : "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1392 : : blocks_count, free_blocks, reserved_blocks);
1393 : 0 : }
1394 : :
1395 : : /* Add a flex group to an fs. Ensure we handle all possible error conditions
1396 : : * _before_ we start modifying the filesystem, because we cannot abort the
1397 : : * transaction and not have it write the data to disk.
1398 : : */
1399 : 0 : static int ext4_flex_group_add(struct super_block *sb,
1400 : : struct inode *resize_inode,
1401 : 0 : struct ext4_new_flex_group_data *flex_gd)
1402 : : {
1403 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1404 : 0 : struct ext4_super_block *es = sbi->s_es;
1405 : : ext4_fsblk_t o_blocks_count;
1406 : : ext4_grpblk_t last;
1407 : : ext4_group_t group;
1408 : : handle_t *handle;
1409 : : unsigned reserved_gdb;
1410 : : int err = 0, err2 = 0, credit;
1411 : :
1412 [ # # ][ # # ]: 0 : BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
[ # # ][ # # ]
1413 : :
1414 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1415 : : o_blocks_count = ext4_blocks_count(es);
1416 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1417 [ # # ]: 0 : BUG_ON(last);
1418 : :
1419 : 0 : err = setup_new_flex_group_blocks(sb, flex_gd);
1420 [ # # ]: 0 : if (err)
1421 : : goto exit;
1422 : : /*
1423 : : * We will always be modifying at least the superblock and GDT
1424 : : * block. If we are adding a group past the last current GDT block,
1425 : : * we will also modify the inode and the dindirect block. If we
1426 : : * are adding a group with superblock/GDT backups we will also
1427 : : * modify each of the reserved GDT dindirect blocks.
1428 : : */
1429 : 0 : credit = flex_gd->count * 4 + reserved_gdb;
1430 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1431 [ # # ]: 0 : if (IS_ERR(handle)) {
1432 : : err = PTR_ERR(handle);
1433 : 0 : goto exit;
1434 : : }
1435 : :
1436 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1437 [ # # ]: 0 : if (err)
1438 : : goto exit_journal;
1439 : :
1440 : 0 : group = flex_gd->groups[0].group;
1441 [ # # ]: 0 : BUG_ON(group != EXT4_SB(sb)->s_groups_count);
1442 : 0 : err = ext4_add_new_descs(handle, sb, group,
1443 : : resize_inode, flex_gd->count);
1444 [ # # ]: 0 : if (err)
1445 : : goto exit_journal;
1446 : :
1447 : 0 : err = ext4_setup_new_descs(handle, sb, flex_gd);
1448 [ # # ]: 0 : if (err)
1449 : : goto exit_journal;
1450 : :
1451 : 0 : ext4_update_super(sb, flex_gd);
1452 : :
1453 : 0 : err = ext4_handle_dirty_super(handle, sb);
1454 : :
1455 : : exit_journal:
1456 : 0 : err2 = ext4_journal_stop(handle);
1457 [ # # ]: 0 : if (!err)
1458 : : err = err2;
1459 : :
1460 [ # # ]: 0 : if (!err) {
1461 : 0 : int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1462 : 0 : int gdb_num_end = ((group + flex_gd->count - 1) /
1463 : : EXT4_DESC_PER_BLOCK(sb));
1464 : 0 : int meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb,
1465 : : EXT4_FEATURE_INCOMPAT_META_BG);
1466 : : sector_t old_gdb = 0;
1467 : :
1468 : 0 : update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
1469 : : sizeof(struct ext4_super_block), 0);
1470 [ # # ]: 0 : for (; gdb_num <= gdb_num_end; gdb_num++) {
1471 : : struct buffer_head *gdb_bh;
1472 : :
1473 : 0 : gdb_bh = sbi->s_group_desc[gdb_num];
1474 [ # # ]: 0 : if (old_gdb == gdb_bh->b_blocknr)
1475 : 0 : continue;
1476 : 0 : update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1477 : 0 : gdb_bh->b_size, meta_bg);
1478 : 0 : old_gdb = gdb_bh->b_blocknr;
1479 : : }
1480 : : }
1481 : : exit:
1482 : 0 : return err;
1483 : : }
1484 : :
1485 : 0 : static int ext4_setup_next_flex_gd(struct super_block *sb,
1486 : : struct ext4_new_flex_group_data *flex_gd,
1487 : : ext4_fsblk_t n_blocks_count,
1488 : : unsigned long flexbg_size)
1489 : : {
1490 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1491 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1492 : : ext4_fsblk_t o_blocks_count;
1493 : : ext4_group_t n_group;
1494 : : ext4_group_t group;
1495 : : ext4_group_t last_group;
1496 : : ext4_grpblk_t last;
1497 : : ext4_grpblk_t blocks_per_group;
1498 : : unsigned long i;
1499 : :
1500 : 0 : blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb);
1501 : :
1502 : : o_blocks_count = ext4_blocks_count(es);
1503 : :
1504 [ # # ]: 0 : if (o_blocks_count == n_blocks_count)
1505 : : return 0;
1506 : :
1507 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1508 [ # # ]: 0 : BUG_ON(last);
1509 : 0 : ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1510 : :
1511 : 0 : last_group = group | (flexbg_size - 1);
1512 [ # # ]: 0 : if (last_group > n_group)
1513 : : last_group = n_group;
1514 : :
1515 : 0 : flex_gd->count = last_group - group + 1;
1516 : :
1517 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
1518 : : int overhead;
1519 : :
1520 : 0 : group_data[i].group = group + i;
1521 : 0 : group_data[i].blocks_count = blocks_per_group;
1522 : 0 : overhead = ext4_group_overhead_blocks(sb, group + i);
1523 : 0 : group_data[i].free_blocks_count = blocks_per_group - overhead;
1524 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb)) {
1525 : 0 : flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1526 : : EXT4_BG_INODE_UNINIT;
1527 [ # # ]: 0 : if (!test_opt(sb, INIT_INODE_TABLE))
1528 : 0 : flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1529 : : } else
1530 : 0 : flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1531 : : }
1532 : :
1533 [ # # ][ # # ]: 0 : if (last_group == n_group && ext4_has_group_desc_csum(sb))
1534 : : /* We need to initialize block bitmap of last group. */
1535 : 0 : flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1536 : :
1537 [ # # ][ # # ]: 0 : if ((last_group == n_group) && (last != blocks_per_group - 1)) {
1538 : 0 : group_data[i - 1].blocks_count = last + 1;
1539 : 0 : group_data[i - 1].free_blocks_count -= blocks_per_group-
1540 : : last - 1;
1541 : : }
1542 : :
1543 : : return 1;
1544 : : }
1545 : :
1546 : : /* Add group descriptor data to an existing or new group descriptor block.
1547 : : * Ensure we handle all possible error conditions _before_ we start modifying
1548 : : * the filesystem, because we cannot abort the transaction and not have it
1549 : : * write the data to disk.
1550 : : *
1551 : : * If we are on a GDT block boundary, we need to get the reserved GDT block.
1552 : : * Otherwise, we may need to add backup GDT blocks for a sparse group.
1553 : : *
1554 : : * We only need to hold the superblock lock while we are actually adding
1555 : : * in the new group's counts to the superblock. Prior to that we have
1556 : : * not really "added" the group at all. We re-check that we are still
1557 : : * adding in the last group in case things have changed since verifying.
1558 : : */
1559 : 0 : int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1560 : : {
1561 : : struct ext4_new_flex_group_data flex_gd;
1562 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1563 : 0 : struct ext4_super_block *es = sbi->s_es;
1564 : 0 : int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1565 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1566 : : struct inode *inode = NULL;
1567 : : int gdb_off;
1568 : : int err;
1569 : 0 : __u16 bg_flags = 0;
1570 : :
1571 : 0 : gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1572 : :
1573 [ # # ][ # # ]: 0 : if (gdb_off == 0 && !EXT4_HAS_RO_COMPAT_FEATURE(sb,
1574 : : EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
1575 : 0 : ext4_warning(sb, "Can't resize non-sparse filesystem further");
1576 : 0 : return -EPERM;
1577 : : }
1578 : :
1579 [ # # ]: 0 : if (ext4_blocks_count(es) + input->blocks_count <
1580 : : ext4_blocks_count(es)) {
1581 : 0 : ext4_warning(sb, "blocks_count overflow");
1582 : 0 : return -EINVAL;
1583 : : }
1584 : :
1585 [ # # ]: 0 : if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1586 : : le32_to_cpu(es->s_inodes_count)) {
1587 : 0 : ext4_warning(sb, "inodes_count overflow");
1588 : 0 : return -EINVAL;
1589 : : }
1590 : :
1591 [ # # ]: 0 : if (reserved_gdb || gdb_off == 0) {
1592 [ # # ]: 0 : if (!EXT4_HAS_COMPAT_FEATURE(sb,
1593 : : EXT4_FEATURE_COMPAT_RESIZE_INODE)
1594 [ # # ]: 0 : || !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1595 : 0 : ext4_warning(sb,
1596 : : "No reserved GDT blocks, can't resize");
1597 : 0 : return -EPERM;
1598 : : }
1599 : 0 : inode = ext4_iget(sb, EXT4_RESIZE_INO);
1600 [ # # ]: 0 : if (IS_ERR(inode)) {
1601 : 0 : ext4_warning(sb, "Error opening resize inode");
1602 : 0 : return PTR_ERR(inode);
1603 : : }
1604 : : }
1605 : :
1606 : :
1607 : 0 : err = verify_group_input(sb, input);
1608 [ # # ]: 0 : if (err)
1609 : : goto out;
1610 : :
1611 : 0 : err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1612 [ # # ]: 0 : if (err)
1613 : : goto out;
1614 : :
1615 : 0 : err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1616 [ # # ]: 0 : if (err)
1617 : : goto out;
1618 : :
1619 : 0 : flex_gd.count = 1;
1620 : 0 : flex_gd.groups = input;
1621 : 0 : flex_gd.bg_flags = &bg_flags;
1622 : 0 : err = ext4_flex_group_add(sb, inode, &flex_gd);
1623 : : out:
1624 : 0 : iput(inode);
1625 : 0 : return err;
1626 : : } /* ext4_group_add */
1627 : :
1628 : : /*
1629 : : * extend a group without checking assuming that checking has been done.
1630 : : */
1631 : 0 : static int ext4_group_extend_no_check(struct super_block *sb,
1632 : : ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1633 : : {
1634 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1635 : : handle_t *handle;
1636 : : int err = 0, err2;
1637 : :
1638 : : /* We will update the superblock, one block bitmap, and
1639 : : * one group descriptor via ext4_group_add_blocks().
1640 : : */
1641 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1642 [ # # ]: 0 : if (IS_ERR(handle)) {
1643 : : err = PTR_ERR(handle);
1644 : 0 : ext4_warning(sb, "error %d on journal start", err);
1645 : 0 : return err;
1646 : : }
1647 : :
1648 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
1649 [ # # ]: 0 : if (err) {
1650 : 0 : ext4_warning(sb, "error %d on journal write access", err);
1651 : 0 : goto errout;
1652 : : }
1653 : :
1654 : 0 : ext4_blocks_count_set(es, o_blocks_count + add);
1655 : 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1656 : : ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1657 : : o_blocks_count + add);
1658 : : /* We add the blocks to the bitmap and set the group need init bit */
1659 : 0 : err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1660 [ # # ]: 0 : if (err)
1661 : : goto errout;
1662 : 0 : ext4_handle_dirty_super(handle, sb);
1663 : : ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1664 : : o_blocks_count + add);
1665 : : errout:
1666 : 0 : err2 = ext4_journal_stop(handle);
1667 [ # # ]: 0 : if (err2 && !err)
1668 : : err = err2;
1669 : :
1670 [ # # ]: 0 : if (!err) {
1671 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1672 : 0 : printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1673 : : "blocks\n", ext4_blocks_count(es));
1674 : 0 : update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
1675 : : (char *)es, sizeof(struct ext4_super_block), 0);
1676 : : }
1677 : 0 : return err;
1678 : : }
1679 : :
1680 : : /*
1681 : : * Extend the filesystem to the new number of blocks specified. This entry
1682 : : * point is only used to extend the current filesystem to the end of the last
1683 : : * existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
1684 : : * for emergencies (because it has no dependencies on reserved blocks).
1685 : : *
1686 : : * If we _really_ wanted, we could use default values to call ext4_group_add()
1687 : : * allow the "remount" trick to work for arbitrary resizing, assuming enough
1688 : : * GDT blocks are reserved to grow to the desired size.
1689 : : */
1690 : 0 : int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1691 : : ext4_fsblk_t n_blocks_count)
1692 : : {
1693 : : ext4_fsblk_t o_blocks_count;
1694 : : ext4_grpblk_t last;
1695 : : ext4_grpblk_t add;
1696 : : struct buffer_head *bh;
1697 : : int err;
1698 : : ext4_group_t group;
1699 : :
1700 : : o_blocks_count = ext4_blocks_count(es);
1701 : :
1702 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1703 : 0 : ext4_msg(sb, KERN_DEBUG,
1704 : : "extending last group from %llu to %llu blocks",
1705 : : o_blocks_count, n_blocks_count);
1706 : :
1707 [ # # ]: 0 : if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1708 : : return 0;
1709 : :
1710 [ # # ]: 0 : if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1711 : 0 : ext4_msg(sb, KERN_ERR,
1712 : : "filesystem too large to resize to %llu blocks safely",
1713 : : n_blocks_count);
1714 : : if (sizeof(sector_t) < 8)
1715 : : ext4_warning(sb, "CONFIG_LBDAF not enabled");
1716 : 0 : return -EINVAL;
1717 : : }
1718 : :
1719 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1720 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1721 : 0 : return -EINVAL;
1722 : : }
1723 : :
1724 : : /* Handle the remaining blocks in the last group only. */
1725 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1726 : :
1727 [ # # ]: 0 : if (last == 0) {
1728 : 0 : ext4_warning(sb, "need to use ext2online to resize further");
1729 : 0 : return -EPERM;
1730 : : }
1731 : :
1732 : 0 : add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1733 : :
1734 [ # # ]: 0 : if (o_blocks_count + add < o_blocks_count) {
1735 : 0 : ext4_warning(sb, "blocks_count overflow");
1736 : 0 : return -EINVAL;
1737 : : }
1738 : :
1739 [ # # ]: 0 : if (o_blocks_count + add > n_blocks_count)
1740 : 0 : add = n_blocks_count - o_blocks_count;
1741 : :
1742 [ # # ]: 0 : if (o_blocks_count + add < n_blocks_count)
1743 : 0 : ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1744 : : o_blocks_count + add, add);
1745 : :
1746 : : /* See if the device is actually as big as what was requested */
1747 : 0 : bh = sb_bread(sb, o_blocks_count + add - 1);
1748 [ # # ]: 0 : if (!bh) {
1749 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1750 : 0 : return -ENOSPC;
1751 : : }
1752 : : brelse(bh);
1753 : :
1754 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1755 : 0 : return err;
1756 : : } /* ext4_group_extend */
1757 : :
1758 : :
1759 : 0 : static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1760 : : {
1761 : 0 : return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1762 : : }
1763 : :
1764 : : /*
1765 : : * Release the resize inode and drop the resize_inode feature if there
1766 : : * are no more reserved gdt blocks, and then convert the file system
1767 : : * to enable meta_bg
1768 : : */
1769 : 0 : static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1770 : : {
1771 : : handle_t *handle;
1772 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1773 : 0 : struct ext4_super_block *es = sbi->s_es;
1774 : : struct ext4_inode_info *ei = EXT4_I(inode);
1775 : : ext4_fsblk_t nr;
1776 : : int i, ret, err = 0;
1777 : : int credits = 1;
1778 : :
1779 : 0 : ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1780 [ # # ]: 0 : if (inode) {
1781 [ # # ]: 0 : if (es->s_reserved_gdt_blocks) {
1782 : 0 : ext4_error(sb, "Unexpected non-zero "
1783 : : "s_reserved_gdt_blocks");
1784 : 0 : return -EPERM;
1785 : : }
1786 : :
1787 : : /* Do a quick sanity check of the resize inode */
1788 [ # # ]: 0 : if (inode->i_blocks != 1 << (inode->i_blkbits - 9))
1789 : : goto invalid_resize_inode;
1790 [ # # ]: 0 : for (i = 0; i < EXT4_N_BLOCKS; i++) {
1791 [ # # ]: 0 : if (i == EXT4_DIND_BLOCK) {
1792 [ # # ]: 0 : if (ei->i_data[i])
1793 : 0 : continue;
1794 : : else
1795 : : goto invalid_resize_inode;
1796 : : }
1797 [ # # ]: 0 : if (ei->i_data[i])
1798 : : goto invalid_resize_inode;
1799 : : }
1800 : : credits += 3; /* block bitmap, bg descriptor, resize inode */
1801 : : }
1802 : :
1803 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1804 [ # # ]: 0 : if (IS_ERR(handle))
1805 : 0 : return PTR_ERR(handle);
1806 : :
1807 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1808 [ # # ]: 0 : if (err)
1809 : : goto errout;
1810 : :
1811 : 0 : EXT4_CLEAR_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE);
1812 : 0 : EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1813 : 0 : sbi->s_es->s_first_meta_bg =
1814 : 0 : cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1815 : :
1816 : 0 : err = ext4_handle_dirty_super(handle, sb);
1817 [ # # ]: 0 : if (err) {
1818 [ # # ]: 0 : ext4_std_error(sb, err);
1819 : : goto errout;
1820 : : }
1821 : :
1822 [ # # ]: 0 : if (inode) {
1823 : 0 : nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1824 : 0 : ext4_free_blocks(handle, inode, NULL, nr, 1,
1825 : : EXT4_FREE_BLOCKS_METADATA |
1826 : : EXT4_FREE_BLOCKS_FORGET);
1827 : 0 : ei->i_data[EXT4_DIND_BLOCK] = 0;
1828 : 0 : inode->i_blocks = 0;
1829 : :
1830 : 0 : err = ext4_mark_inode_dirty(handle, inode);
1831 [ # # ]: 0 : if (err)
1832 [ # # ]: 0 : ext4_std_error(sb, err);
1833 : : }
1834 : :
1835 : : errout:
1836 : 0 : ret = ext4_journal_stop(handle);
1837 : : if (!err)
1838 : : err = ret;
1839 : 0 : return ret;
1840 : :
1841 : : invalid_resize_inode:
1842 : 0 : ext4_error(sb, "corrupted/inconsistent resize inode");
1843 : 0 : return -EINVAL;
1844 : : }
1845 : :
1846 : : /*
1847 : : * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1848 : : *
1849 : : * @sb: super block of the fs to be resized
1850 : : * @n_blocks_count: the number of blocks resides in the resized fs
1851 : : */
1852 : 0 : int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1853 : : {
1854 : : struct ext4_new_flex_group_data *flex_gd = NULL;
1855 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1856 : 0 : struct ext4_super_block *es = sbi->s_es;
1857 : : struct buffer_head *bh;
1858 : : struct inode *resize_inode = NULL;
1859 : : ext4_grpblk_t add, offset;
1860 : : unsigned long n_desc_blocks;
1861 : : unsigned long o_desc_blocks;
1862 : : ext4_group_t o_group;
1863 : : ext4_group_t n_group;
1864 : : ext4_fsblk_t o_blocks_count;
1865 : : ext4_fsblk_t n_blocks_count_retry = 0;
1866 : : unsigned long last_update_time = 0;
1867 : 0 : int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
1868 : : int meta_bg;
1869 : :
1870 : : /* See if the device is actually as big as what was requested */
1871 : 0 : bh = sb_bread(sb, n_blocks_count - 1);
1872 [ # # ]: 0 : if (!bh) {
1873 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1874 : 0 : return -ENOSPC;
1875 : : }
1876 : : brelse(bh);
1877 : :
1878 : : retry:
1879 : : o_blocks_count = ext4_blocks_count(es);
1880 : :
1881 : 0 : ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
1882 : : "to %llu blocks", o_blocks_count, n_blocks_count);
1883 : :
1884 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1885 : : /* On-line shrinking not supported */
1886 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1887 : 0 : return -EINVAL;
1888 : : }
1889 : :
1890 [ # # ]: 0 : if (n_blocks_count == o_blocks_count)
1891 : : /* Nothing need to do */
1892 : : return 0;
1893 : :
1894 : 0 : n_group = ext4_get_group_number(sb, n_blocks_count - 1);
1895 [ # # ]: 0 : if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
1896 : 0 : ext4_warning(sb, "resize would cause inodes_count overflow");
1897 : 0 : return -EINVAL;
1898 : : }
1899 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
1900 : :
1901 : 0 : n_desc_blocks = num_desc_blocks(sb, n_group + 1);
1902 : 0 : o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
1903 : :
1904 : 0 : meta_bg = EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG);
1905 : :
1906 [ # # ]: 0 : if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_RESIZE_INODE)) {
1907 [ # # ]: 0 : if (meta_bg) {
1908 : 0 : ext4_error(sb, "resize_inode and meta_bg enabled "
1909 : : "simultaneously");
1910 : 0 : return -EINVAL;
1911 : : }
1912 [ # # ]: 0 : if (n_desc_blocks > o_desc_blocks +
1913 : 0 : le16_to_cpu(es->s_reserved_gdt_blocks)) {
1914 : : n_blocks_count_retry = n_blocks_count;
1915 : : n_desc_blocks = o_desc_blocks +
1916 : : le16_to_cpu(es->s_reserved_gdt_blocks);
1917 : 0 : n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
1918 : 0 : n_blocks_count = n_group * EXT4_BLOCKS_PER_GROUP(sb);
1919 : 0 : n_group--; /* set to last group number */
1920 : : }
1921 : :
1922 [ # # ]: 0 : if (!resize_inode)
1923 : 0 : resize_inode = ext4_iget(sb, EXT4_RESIZE_INO);
1924 [ # # ]: 0 : if (IS_ERR(resize_inode)) {
1925 : 0 : ext4_warning(sb, "Error opening resize inode");
1926 : 0 : return PTR_ERR(resize_inode);
1927 : : }
1928 : : }
1929 : :
1930 [ # # ][ # # ]: 0 : if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
1931 : 0 : err = ext4_convert_meta_bg(sb, resize_inode);
1932 [ # # ]: 0 : if (err)
1933 : : goto out;
1934 [ # # ]: 0 : if (resize_inode) {
1935 : 0 : iput(resize_inode);
1936 : : resize_inode = NULL;
1937 : : }
1938 [ # # ]: 0 : if (n_blocks_count_retry) {
1939 : : n_blocks_count = n_blocks_count_retry;
1940 : : n_blocks_count_retry = 0;
1941 : : goto retry;
1942 : : }
1943 : : }
1944 : :
1945 : : /* extend the last group */
1946 [ # # ]: 0 : if (n_group == o_group)
1947 : 0 : add = n_blocks_count - o_blocks_count;
1948 : : else
1949 : 0 : add = EXT4_BLOCKS_PER_GROUP(sb) - (offset + 1);
1950 [ # # ]: 0 : if (add > 0) {
1951 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1952 [ # # ]: 0 : if (err)
1953 : : goto out;
1954 : : }
1955 : :
1956 [ # # ]: 0 : if (ext4_blocks_count(es) == n_blocks_count)
1957 : : goto out;
1958 : :
1959 : 0 : err = ext4_alloc_flex_bg_array(sb, n_group + 1);
1960 [ # # ]: 0 : if (err)
1961 : : return err;
1962 : :
1963 : 0 : err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
1964 [ # # ]: 0 : if (err)
1965 : : goto out;
1966 : :
1967 : 0 : flex_gd = alloc_flex_gd(flexbg_size);
1968 [ # # ]: 0 : if (flex_gd == NULL) {
1969 : : err = -ENOMEM;
1970 : : goto out;
1971 : : }
1972 : :
1973 : : /* Add flex groups. Note that a regular group is a
1974 : : * flex group with 1 group.
1975 : : */
1976 [ # # ]: 0 : while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
1977 : : flexbg_size)) {
1978 [ # # ]: 0 : if (jiffies - last_update_time > HZ * 10) {
1979 [ # # ]: 0 : if (last_update_time)
1980 : 0 : ext4_msg(sb, KERN_INFO,
1981 : : "resized to %llu blocks",
1982 : : ext4_blocks_count(es));
1983 : 0 : last_update_time = jiffies;
1984 : : }
1985 [ # # ]: 0 : if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
1986 : : break;
1987 : 0 : err = ext4_flex_group_add(sb, resize_inode, flex_gd);
1988 [ # # ]: 0 : if (unlikely(err))
1989 : : break;
1990 : : }
1991 : :
1992 [ # # ]: 0 : if (!err && n_blocks_count_retry) {
1993 : : n_blocks_count = n_blocks_count_retry;
1994 : : n_blocks_count_retry = 0;
1995 : 0 : free_flex_gd(flex_gd);
1996 : : flex_gd = NULL;
1997 : 0 : goto retry;
1998 : : }
1999 : :
2000 : : out:
2001 [ # # ]: 0 : if (flex_gd)
2002 : 0 : free_flex_gd(flex_gd);
2003 [ # # ]: 0 : if (resize_inode != NULL)
2004 : 0 : iput(resize_inode);
2005 : 0 : ext4_msg(sb, KERN_INFO, "resized filesystem to %llu", n_blocks_count);
2006 : 0 : return err;
2007 : : }
|
