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| author | Ritesh Harjani <riteshh@linux.ibm.com> | 2022-02-16 10:02:43 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-02-26 05:34:56 +0300 |
| commit | a5c0e2fdf7cea535ba03259894dc184e5a4c2800 (patch) | |
| tree | f8552cd090aef87110d077c011ff4cccd43c7752 /fs/ext4/mballoc.c | |
| parent | 2d4429205882817100e5e88870ce0663d30c77af (diff) | |
| download | linux-a5c0e2fdf7cea535ba03259894dc184e5a4c2800.tar.xz | |
ext4: correct cluster len and clusters changed accounting in ext4_mb_mark_bb
ext4_mb_mark_bb() currently wrongly calculates cluster len (clen) and
flex_group->free_clusters. This patch fixes that.
Identified based on code review of ext4_mb_mark_bb() function.
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/a0b035d536bafa88110b74456853774b64c8ac40.1644992609.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 67ac95c4cd9b..b8ffbc0ebe14 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3899,10 +3899,11 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_group_t group; ext4_grpblk_t blkoff; - int i, clen, err; + int i, err; int already; + unsigned int clen, clen_changed; - clen = EXT4_B2C(sbi, len); + clen = EXT4_NUM_B2C(sbi, len); ext4_get_group_no_and_offset(sb, block, &group, &blkoff); bitmap_bh = ext4_read_block_bitmap(sb, group); @@ -3923,6 +3924,7 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, if (!mb_test_bit(blkoff + i, bitmap_bh->b_data) == !state) already++; + clen_changed = clen - already; if (state) ext4_set_bits(bitmap_bh->b_data, blkoff, clen); else @@ -3935,9 +3937,9 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, group, gdp)); } if (state) - clen = ext4_free_group_clusters(sb, gdp) - clen + already; + clen = ext4_free_group_clusters(sb, gdp) - clen_changed; else - clen = ext4_free_group_clusters(sb, gdp) + clen - already; + clen = ext4_free_group_clusters(sb, gdp) + clen_changed; ext4_free_group_clusters_set(sb, gdp, clen); ext4_block_bitmap_csum_set(sb, group, gdp, bitmap_bh); @@ -3947,10 +3949,13 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, group); + struct flex_groups *fg = sbi_array_rcu_deref(sbi, + s_flex_groups, flex_group); - atomic64_sub(len, - &sbi_array_rcu_deref(sbi, s_flex_groups, - flex_group)->free_clusters); + if (state) + atomic64_sub(clen_changed, &fg->free_clusters); + else + atomic64_add(clen_changed, &fg->free_clusters); } err = ext4_handle_dirty_metadata(NULL, NULL, bitmap_bh); |