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parallel lookups: actual switch to rwsem

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ta-da!

The main issue is the lack of down_write_killable(), so the places
like readdir.c switched to plain inode_lock(); once killable
variants of rwsem primitives appear, that'll be dealt with.

lockdep side also might need more work

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-04-15 15:08:36 -04:00
commit 9902af79c0
11 changed files with 73 additions and 32 deletions
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