[PATCH] ext4: fix wrong size computation in ext4_mb_normalize_request()
From: Xiaoguang Wang <hidden>
Date: 2014-07-10 05:41:08
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
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 it to block number, then to bytes. Signed-off-by: Xiaoguang Wang <redacted> --- fs/ext4/mballoc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7f72f50..9a543b5 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c@@ -3076,7 +3076,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac, size = 8 * 1024 * 1024; } else { start_off = (loff_t)ac->ac_o_ex.fe_logical << bsbits; - size = ac->ac_o_ex.fe_len << bsbits; + size = EXT4_C2B(EXT4_SB(ac->ac_sb), + ac->ac_o_ex.fe_len) << bsbits; } size = size >> bsbits; start = start_off >> bsbits;
--
1.8.2.1