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authorXiaoguang Wang <wangxg.fnst@cn.fujitsu.com>2014-07-28 06:26:36 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-07-28 06:26:36 +0400
commitb27b1535acc0e97b7435bccf205b3fe9c782afac (patch)
tree0bd7468d36828c1f7b28d7e60b7a4673e941d402 /fs
parent83447ccb4df6e6051027bedff2a8cfc6a52ebcf8 (diff)
downloadlinux-b27b1535acc0e97b7435bccf205b3fe9c782afac.tar.xz
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 <wangxg.fnst@cn.fujitsu.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/mballoc.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 18a16191249a..0e9466f9e767 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;