From b27b1535acc0e97b7435bccf205b3fe9c782afac Mon Sep 17 00:00:00 2001 From: Xiaoguang Wang Date: Sun, 27 Jul 2014 22:26:36 -0400 Subject: ext4: fix wrong size computation in ext4_mb_normalize_request() As the member fe_len defined in struct ext4_free_extent is expressed as number of clusters, the variable "size" computation is wrong, we need to first translate fe_len to block number, then to bytes. Signed-off-by: Xiaoguang Wang Signed-off-by: Theodore Ts'o Reviewed-by: Lukas Czerner --- fs/ext4/mballoc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 18a1619..0e9466f 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3075,8 +3075,9 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac, (23 - bsbits)) << 23; size = 8 * 1024 * 1024; } else { - start_off = (loff_t)ac->ac_o_ex.fe_logical << bsbits; - size = ac->ac_o_ex.fe_len << bsbits; + start_off = (loff_t) ac->ac_o_ex.fe_logical << bsbits; + size = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb), + ac->ac_o_ex.fe_len) << bsbits; } size = size >> bsbits; start = start_off >> bsbits; -- cgit v1.1