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| author | Lukas Czerner <lczerner@redhat.com> | 2011-05-24 18:28:07 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-05-24 18:28:07 -0400 |
| commit | 28739eea9cd42598b632972f5cc64a458c5d40b3 (patch) | |
| tree | 10d4db959544884e6612ea329920a2cf73a6f0b6 /fs/ext4/mballoc.c | |
| parent | 78944086663e6c1b03f3d60bf7610128149be5fc (diff) | |
| download | op-kernel-dev-28739eea9cd42598b632972f5cc64a458c5d40b3.zip op-kernel-dev-28739eea9cd42598b632972f5cc64a458c5d40b3.tar.gz | |
ext4: protect bb_first_free in ext4_trim_all_free() with group lock
We should protect reading bd_info->bb_first_free with the group lock
because otherwise we might miss some free blocks. This is not a big deal
at all, but the change to do right thing is really simple, so lets do
that.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 38a11bf..396b01f 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4825,11 +4825,11 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group, "information for %u", group); return ret; } - bitmap = e4b.bd_bitmap; + + ext4_lock_group(sb, group); start = (e4b.bd_info->bb_first_free > start) ? e4b.bd_info->bb_first_free : start; - ext4_lock_group(sb, group); while (start < max) { start = mb_find_next_zero_bit(bitmap, max, start); |
