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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>
This commit is contained in:
Lukas Czerner 2011-05-24 18:28:07 -04:00 committed by Theodore Ts'o
parent 7894408666
commit 28739eea9c
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/mballoc.c
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@ -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);