https://github.com/torvalds/linux
Revision 8b9d96666529a979acf4825391efcc7c8a3e9f12 authored by Heinz Mauelshagen on 11 March 2014, 23:40:05 UTC, committed by Mike Snitzer on 12 March 2014, 17:49:27 UTC
During demotion or promotion to a cache's >2TB fast device we must not truncate the cache block's associated sector to 32bits. The 32bit temporary result of from_cblock() caused a 32bit multiplication when calculating the sector of the fast device in issue_copy_real(). Use an intermediate 64bit type to store the 32bit from_cblock() to allow for proper 64bit multiplication. Here is an example of how this bug manifests on an ext4 filesystem: EXT4-fs error (device dm-0): ext4_mb_generate_buddy:756: group 17136, 32768 clusters in bitmap, 30688 in gd; block bitmap corrupt. JBD2: Spotted dirty metadata buffer (dev = dm-0, blocknr = 0). There's a risk of filesystem corruption in case of system crash. Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
1 parent cebc2de
Tip revision: 8b9d96666529a979acf4825391efcc7c8a3e9f12 authored by Heinz Mauelshagen on 11 March 2014, 23:40:05 UTC
dm cache: fix truncation bug when copying a block to/from >2TB fast device
dm cache: fix truncation bug when copying a block to/from >2TB fast device
Tip revision: 8b9d966
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