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ext4: prevent used blocks from being allocated during fast commit replay

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During fast commit replay procedure, we clear inode blocks bitmap in
ext4_ext_clear_bb(), this may cause ext4_mb_new_blocks_simple() allocate
blocks still in use.

Make ext4_fc_record_regions() also record physical disk regions used by
inodes during replay procedure. Then ext4_mb_new_blocks_simple() can
excludes these blocks in use.

Signed-off-by: Xin Yin <yinxin.x@bytedance.com>
Link: https://lore.kernel.org/r/20220110035141.1980-2-yinxin.x@bytedance.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
This commit is contained in:
Xin Yin 2022-01-10 11:51:40 +08:00 • committed by Theodore Ts'o
parent 6eeaf88fd5
commit 599ea31d13
3 changed files with 22 additions and 5 deletions
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20
fs/ext4/fast_commit.c
View file

@ -1563,16 +1563,23 @@ out:
}
/*
* Record physical disk regions which are in use as per fast commit area. Our
* simple replay phase allocator excludes these regions from allocation.
* Record physical disk regions which are in use as per fast commit area,
* and used by inodes during replay phase. Our simple replay phase
* allocator excludes these regions from allocation.
*/
static int ext4_fc_record_regions(struct super_block *sb, int ino,
ext4_lblk_t lblk, ext4_fsblk_t pblk, int len)
int ext4_fc_record_regions(struct super_block *sb, int ino,
ext4_lblk_t lblk, ext4_fsblk_t pblk, int len, int replay)
{
struct ext4_fc_replay_state *state;
struct ext4_fc_alloc_region *region;
state = &EXT4_SB(sb)->s_fc_replay_state;
/*
* during replay phase, the fc_regions_valid may not same as
* fc_regions_used, update it when do new additions.
*/
if (replay && state->fc_regions_used != state->fc_regions_valid)
state->fc_regions_used = state->fc_regions_valid;
if (state->fc_regions_used == state->fc_regions_size) {
state->fc_regions_size +=
EXT4_FC_REPLAY_REALLOC_INCREMENT;
@ -1590,6 +1597,9 @@ static int ext4_fc_record_regions(struct super_block *sb, int ino,
region->pblk = pblk;
region->len = len;
if (replay)
state->fc_regions_valid++;
return 0;
}
@ -1937,7 +1947,7 @@ static int ext4_fc_replay_scan(journal_t *journal,
ret = ext4_fc_record_regions(sb,
le32_to_cpu(ext.fc_ino),
le32_to_cpu(ex->ee_block), ext4_ext_pblock(ex),
ext4_ext_get_actual_len(ex));
ext4_ext_get_actual_len(ex), 0);
if (ret < 0)
break;
ret = JBD2_FC_REPLAY_CONTINUE;