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| author | Christoph Hellwig <[email protected]> | 2009-02-24 13:39:02 +0000 |
|---|---|---|
| committer | Felix Blyakher <[email protected]> | 2009-04-30 05:29:02 +0000 |
| commit | 28e211700a81b0a934b6c7a4b8e7dda843634d2f (patch) | |
| tree | 234d0754b9a5c9bc3b0ae890eeef57aa7d1ee29e /drivers/i2c/algos/i2c-algo-bit.c | |
| parent | xfs: a couple getbmap cleanups (diff) | |
| download | kernel-28e211700a81b0a934b6c7a4b8e7dda843634d2f.tar.gz kernel-28e211700a81b0a934b6c7a4b8e7dda843634d2f.zip | |
xfs: fix getbmap vs mmap deadlock
xfs_getbmap (or rather the formatters called by it) copy out the getbmap
structures under the ilock, which can deadlock against mmap. This has
been reported via bugzilla a while ago (#717) and has recently also
shown up via lockdep.
So allocate a temporary buffer to format the kernel getbmap structures
into and then copy them out after dropping the locks.
A little problem with this is that we limit the number of extents we
can copy out by the maximum allocation size, but I see no real way
around that.
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Eric Sandeen <[email protected]>
Reviewed-by: Felix Blyakher <[email protected]>
Signed-off-by: Felix Blyakher <[email protected]>
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-bit.c')
0 files changed, 0 insertions, 0 deletions