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| author | Theodore Ts'o <tytso@mit.edu> | 2012-08-16 11:59:04 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-08-17 09:23:00 -0400 |
| commit | 0548bbb85337e532ca2ed697c3e9b227ff2ed4b4 (patch) | |
| tree | aed6d4a1b8feb45bf4edad074ba891adc9c0c50e /fs/ext4/super.c | |
| parent | 7a4c5de27efa4c2ecca87af0a3deea63446367e2 (diff) | |
| download | linux-0548bbb85337e532ca2ed697c3e9b227ff2ed4b4.tar.bz2 | |
ext4: fix long mount times on very big file systems
Commit 8aeb00ff85a: "ext4: fix overhead calculation used by
ext4_statfs()" introduced a O(n**2) calculation which makes very large
file systems take forever to mount. Fix this with an optimization for
non-bigalloc file systems. (For bigalloc file systems the overhead
needs to be set in the the superblock.)
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 56bcaec9149c..598498904035 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3120,6 +3120,10 @@ static int count_overhead(struct super_block *sb, ext4_group_t grp, ext4_group_t i, ngroups = ext4_get_groups_count(sb); int s, j, count = 0; + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) + return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + + sbi->s_itb_per_group + 2); + first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + (grp * EXT4_BLOCKS_PER_GROUP(sb)); last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; |