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. v2: Add rwsem_assert_held() and rwsem_assert_held_write() instead of augmenting the existing rwsem_is_locked() with rwsem_is_write_locked(). There's also an __rwsem_assert_held() and __rwsem_assert_held_write() for the benefit of XFS when it's in a context where lockdep doesn't know what's going on. It's still an improvement, so I hope those who are looking for perfection can accept a mere improvement. We can do more to replace uses of rwsem_is_locked(), and I have a few of those in my tree, but let's focus on these three use cases for now and we can trickle in other improvements through other maintainers after 6.7. I'm sympathetic to "this will warn twice and dump much the same information if you have lockdep enabled". Perhaps somebody has a suggestion for not doing that? Matthew Wilcox (Oracle) (5): locking: Add rwsem_assert_held() and rwsem_assert_held_write() mm: Use rwsem assertion macros for mmap_lock xfs: Replace xfs_isilocked with xfs_assert_locked xfs: Remove mrlock wrapper fs: Add inode_assert_locked() and inode_assert_locked_excl() fs/attr.c | 2 +- fs/namei.c | 6 +-- fs/xfs/libxfs/xfs_attr.c | 2 +- fs/xfs/libxfs/xfs_attr_remote.c | 2 +- fs/xfs/libxfs/xfs_bmap.c | 19 ++++---- fs/xfs/libxfs/xfs_defer.c | 2 +- fs/xfs/libxfs/xfs_inode_fork.c | 2 +- fs/xfs/libxfs/xfs_rtbitmap.c | 2 +- fs/xfs/libxfs/xfs_trans_inode.c | 6 +-- fs/xfs/mrlock.h | 78 ------------------------------ fs/xfs/scrub/readdir.c | 4 +- fs/xfs/xfs_attr_list.c | 2 +- fs/xfs/xfs_bmap_util.c | 10 ++-- fs/xfs/xfs_dir2_readdir.c | 2 +- fs/xfs/xfs_dquot.c | 4 +- fs/xfs/xfs_file.c | 4 +- fs/xfs/xfs_inode.c | 86 ++++++++++++--------------------- fs/xfs/xfs_inode.h | 4 +- fs/xfs/xfs_inode_item.c | 4 +- fs/xfs/xfs_iops.c | 7 ++- fs/xfs/xfs_linux.h | 2 +- fs/xfs/xfs_qm.c | 10 ++-- fs/xfs/xfs_reflink.c | 2 +- fs/xfs/xfs_rtalloc.c | 4 +- fs/xfs/xfs_super.c | 4 +- fs/xfs/xfs_symlink.c | 2 +- fs/xfs/xfs_trans_dquot.c | 2 +- include/linux/fs.h | 10 ++++ include/linux/mmap_lock.h | 10 ++-- include/linux/rwbase_rt.h | 9 +++- include/linux/rwsem.h | 42 ++++++++++++++-- 31 files changed, 142 insertions(+), 203 deletions(-) delete mode 100644 fs/xfs/mrlock.h -- 2.40.1
