[PATCH 0/5] Remove the XFS mrlock

Matthew Wilcox (Oracle)
2023-09-07T17:48:06Z

XFS has an mrlock wrapper around the rwsem which adds only the
functionality of knowing whether the rwsem is currently held in read
or write mode. Both regular rwsems and rt-rwsems know this, they just
don't expose it as an API. By adding that, we can remove the XFS mrlock
as well as improving the debug assertions for the mmap_lock when lockdep
is disabled.

I'd like acks from the locking people, then it probably should go upstream
through the XFS tree since that's where the patch series touches the
most code.

Matthew Wilcox (Oracle) (5):
locking: Add rwsem_is_write_locked()
mm: Use rwsem_is_write_locked in mmap_assert_write_locked
xfs: Use rwsem_is_write_locked()
xfs: Remove mrlock wrapper
xfs: Stop using lockdep to assert that locks are held

fs/xfs/mrlock.h | 78 ---------------------------------------
fs/xfs/xfs_inode.c | 61 ++++++++++--------------------
fs/xfs/xfs_inode.h | 2 +-
fs/xfs/xfs_iops.c | 4 +-
fs/xfs/xfs_linux.h | 2 +-
fs/xfs/xfs_super.c | 4 +-
include/linux/mmap_lock.h | 2 +-
include/linux/rwbase_rt.h | 5 +++
include/linux/rwsem.h | 10 +++++
9 files changed, 40 insertions(+), 128 deletions(-)
delete mode 100644 fs/xfs/mrlock.h

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2.40.1