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| author | Theodore Ts'o <tytso@mit.edu> | 2012-08-17 17:46:17 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-08-17 17:46:17 +0400 |
| commit | 01fc48e8929e45e67527200017cff4e74e4ba054 (patch) | |
| tree | e1a4bfe958e9bb0dc2064c45fa2a0db498236a08 | |
| parent | ecb94f5fdf4b72547fca022421a9dca1672bddd4 (diff) | |
| download | linux-01fc48e8929e45e67527200017cff4e74e4ba054.tar.xz | |
ext4: don't load the block bitmap for block groups which have no space
Add a short circuit check to ext4_mb_group_group() so that we don't
bother to load the block bitmap for a block group which does not have
any space available. (Or which does not have enough space until we
are in desperation mode, i.e., when cr == 3.)
Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=45741
Reported-by: mirek@me.com
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/mballoc.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 8eae94771c45..3a57975b73cc 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -1862,6 +1862,12 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac, BUG_ON(cr < 0 || cr >= 4); + free = grp->bb_free; + if (free == 0) + return 0; + if (cr <= 2 && free < ac->ac_g_ex.fe_len) + return 0; + /* We only do this if the grp has never been initialized */ if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { int ret = ext4_mb_init_group(ac->ac_sb, group); @@ -1869,10 +1875,7 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac, return 0; } - free = grp->bb_free; fragments = grp->bb_fragments; - if (free == 0) - return 0; if (fragments == 0) return 0; |