NeilBrown
2615cdae1d
NFS: swap IO handling is slightly different for O_DIRECT IO
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[ Upstream commit 64158668ac ]
1/ Taking the i_rwsem for swap IO triggers lockdep warnings regarding
possible deadlocks with "fs_reclaim". These deadlocks could, I believe,
eventuate if a buffered read on the swapfile was attempted.
We don't need coherence with the page cache for a swap file, and
buffered writes are forbidden anyway. There is no other need for
i_rwsem during direct IO. So never take it for swap_rw()
2/ generic_write_checks() explicitly forbids writes to swap, and
performs checks that are not needed for swap. So bypass it
for swap_rw().
Signed-off-by: NeilBrown <neilb@suse.de >
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com >
Signed-off-by: Sasha Levin <sashal@kernel.org >
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