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author | Jun'ichi Nomura <j-nomura@ce.jp.nec.com> | 2007-12-13 14:15:25 +0000 |
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committer | Alasdair G Kergon <agk@redhat.com> | 2007-12-20 17:32:08 +0000 |
commit | 512875bd9661368da6f993205a61213b79ba1df0 (patch) | |
tree | 7a2e010060b6233cd02e2e36b62f5dcaa96c2c36 /include/asm-sh/cputime.h | |
parent | fbdcf18df73758b2e187ab94678b30cd5f6ff9f9 (diff) |
dm: table detect io beyond device
This patch fixes a panic on shrinking a DM device if there is
outstanding I/O to the part of the device that is being removed.
(Normally this doesn't happen - a filesystem would be resized first,
for example.)
The bug is that __clone_and_map() assumes dm_table_find_target()
always returns a valid pointer. It may fail if a bio arrives from the
block layer but its target sector is no longer included in the DM
btree.
This patch appends an empty entry to table->targets[] which will
be returned by a lookup beyond the end of the device.
After calling dm_table_find_target(), __clone_and_map() and target_message()
check for this condition using
dm_target_is_valid().
Sample test script to trigger oops:
Diffstat (limited to 'include/asm-sh/cputime.h')
0 files changed, 0 insertions, 0 deletions