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05 April 2024, 19:05:47 UTC
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 
dm cache: fix truncation bug when copying a block to/from >2TB fast device
 
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
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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
Tip revision: 8b9d966
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