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authorChristoph Hellwig <hch@lst.de>2016-11-30 06:33:25 +0300
committerDave Chinner <david@fromorbit.com>2016-11-30 06:33:25 +0300
commit6552321831dce87ff5c466a55b58d472732caadc (patch)
tree84f3de7b89690c84fd13e2efa7a85d4918d342e3 /fs/exec.c
parentf8319483f57f1ca22370f4150bb990aca7728a67 (diff)
downloadlinux-6552321831dce87ff5c466a55b58d472732caadc.tar.xz
xfs: remove i_iolock and use i_rwsem in the VFS inode instead
This patch drops the XFS-own i_iolock and uses the VFS i_rwsem which recently replaced i_mutex instead. This means we only have to take one lock instead of two in many fast path operations, and we can also shrink the xfs_inode structure. Thanks to the xfs_ilock family there is very little churn, the only thing of note is that we need to switch to use the lock_two_directory helper for taking the i_rwsem on two inodes in a few places to make sure our lock order matches the one used in the VFS. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Jens Axboe <axboe@fb.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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