https://github.com/torvalds/linux
Revision 650d2a06b4fe1cc1d218c20e256650f68bf0ca31 authored by Mikulas Patocka on 20 July 2012, 13:25:05 UTC, committed by Alasdair G Kergon on 20 July 2012, 13:25:05 UTC
When process_discard receives a partial discard that doesn't cover a full block, it sends this discard down to that block. Unfortunately, the block can be shared and the discard would corrupt the other snapshots sharing this block. This patch detects block sharing and ends the discard with success when sending it to the shared block. The above change means that if the device supports discard it can't be guaranteed that a discard request zeroes data. Therefore, we set ti->discard_zeroes_data_unsupported. Thin target discard support with this bug arrived in commit 104655fd4dcebd50068ef30253a001da72e3a081 (dm thin: support discards). Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@kernel.org Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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History 
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Tip revision: 650d2a06b4fe1cc1d218c20e256650f68bf0ca31 authored by Mikulas Patocka on 20 July 2012, 13:25:05 UTC
dm thin: do not send discards to shared blocks
dm thin: do not send discards to shared blocks
Tip revision: 650d2a0
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .gitignore | -rw-r--r-- | 1014 bytes |
| .mailmap | -rw-r--r-- | 4.4 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 92.7 KB |
| Kbuild | -rw-r--r-- | 2.5 KB |
| Kconfig | -rw-r--r-- | 252 bytes |
| MAINTAINERS | -rw-r--r-- | 208.2 KB |
| Makefile | -rw-r--r-- | 46.0 KB |
| README | -rw-r--r-- | 17.3 KB |
| REPORTING-BUGS | -rw-r--r-- | 3.3 KB |
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