Commit b27b1535 authored Jul 27, 2014 by Xiaoguang Wang Committed by Theodore Ts'o Jul 27, 2014

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>

parent 83447ccb

fs/ext4/mballoc.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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 = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb),
		ac->ac_o_ex.fe_len) << bsbits;
		}
		size = size >> bsbits;
		start = start_off >> bsbits;

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