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