| Message ID | 20201016021005.548850-2-preichl@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | xfs: Remove wrappers for some semaphores | expand |
On Fri, Oct 16, 2020 at 04:10:02AM +0200, Pavel Reichl wrote: > Refactor xfs_isilocked() to use newly introduced __xfs_rwsem_islocked(). > __xfs_rwsem_islocked() is a helper function which encapsulates checking > state of rw_semaphores hold by inode. > > Signed-off-by: Pavel Reichl <preichl@redhat.com> > Suggested-by: Dave Chinner <dchinner@redhat.com> > Suggested-by: Eric Sandeen <sandeen@redhat.com> > Suggested-by: Darrick J. Wong <darrick.wong@oracle.com> > Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> > Reviewed-by: Christoph Hellwig <hch@lst.de> > --- > fs/xfs/xfs_inode.c | 39 +++++++++++++++++++++++++++++++-------- > fs/xfs/xfs_inode.h | 21 ++++++++++++++------- > 2 files changed, 45 insertions(+), 15 deletions(-) > > diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c > index c06129cffba9..1fdf8c7eb990 100644 > --- a/fs/xfs/xfs_inode.c > +++ b/fs/xfs/xfs_inode.c > @@ -345,9 +345,34 @@ xfs_ilock_demote( > } > > #if defined(DEBUG) || defined(XFS_WARN) > -int > +static inline bool > +__xfs_rwsem_islocked( > + struct rw_semaphore *rwsem, > + int lock_flags, > + int shift) > +{ > + lock_flags >>= shift; > + > + if (!debug_locks) > + return rwsem_is_locked(rwsem); > + /* > + * If the shared flag is not set, pass 0 to explicitly check for > + * exclusive access to the lock. If the shared flag is set, we typically > + * want to make sure the lock is at least held in shared mode > + * (i.e., shared | excl) but we don't necessarily care that it might > + * actually be held exclusive. Therefore, pass -1 to check whether the > + * lock is held in any mode rather than one of the explicit shared mode > + * values (1 or 2)." > + */ > + if (lock_flags & (1 << XFS_SHARED_LOCK_SHIFT)) { > + return lockdep_is_held_type(rwsem, -1); > + } Nit: no need for braces here. Otherwise LGTM. Thanks for the tweaks. Reviewed-by: Brian Foster <bfoster@redhat.com> > + return lockdep_is_held_type(rwsem, 0); > +} > + > +bool > xfs_isilocked( > - xfs_inode_t *ip, > + struct xfs_inode *ip, > uint lock_flags) > { > if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { > @@ -362,15 +387,13 @@ xfs_isilocked( > return rwsem_is_locked(&ip->i_mmaplock.mr_lock); > } > > - if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { > - if (!(lock_flags & XFS_IOLOCK_SHARED)) > - return !debug_locks || > - lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0); > - return rwsem_is_locked(&VFS_I(ip)->i_rwsem); > + if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) { > + return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem, lock_flags, > + XFS_IOLOCK_FLAG_SHIFT); > } > > ASSERT(0); > - return 0; > + return false; > } > #endif > > diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h > index e9a8bb184d1f..9cecd6c9c90c 100644 > --- a/fs/xfs/xfs_inode.h > +++ b/fs/xfs/xfs_inode.h > @@ -268,12 +268,19 @@ static inline void xfs_ifunlock(struct xfs_inode *ip) > * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield) > * 1<<16 - 1<<32-1 -- lockdep annotation (integers) > */ > -#define XFS_IOLOCK_EXCL (1<<0) > -#define XFS_IOLOCK_SHARED (1<<1) > -#define XFS_ILOCK_EXCL (1<<2) > -#define XFS_ILOCK_SHARED (1<<3) > -#define XFS_MMAPLOCK_EXCL (1<<4) > -#define XFS_MMAPLOCK_SHARED (1<<5) > + > +#define XFS_IOLOCK_FLAG_SHIFT 0 > +#define XFS_ILOCK_FLAG_SHIFT 2 > +#define XFS_MMAPLOCK_FLAG_SHIFT 4 > + > +#define XFS_SHARED_LOCK_SHIFT 1 > + > +#define XFS_IOLOCK_EXCL (1 << XFS_IOLOCK_FLAG_SHIFT) > +#define XFS_IOLOCK_SHARED (XFS_IOLOCK_EXCL << XFS_SHARED_LOCK_SHIFT) > +#define XFS_ILOCK_EXCL (1 << XFS_ILOCK_FLAG_SHIFT) > +#define XFS_ILOCK_SHARED (XFS_ILOCK_EXCL << XFS_SHARED_LOCK_SHIFT) > +#define XFS_MMAPLOCK_EXCL (1 << XFS_MMAPLOCK_FLAG_SHIFT) > +#define XFS_MMAPLOCK_SHARED (XFS_MMAPLOCK_EXCL << XFS_SHARED_LOCK_SHIFT) > > #define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \ > | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \ > @@ -412,7 +419,7 @@ void xfs_ilock(xfs_inode_t *, uint); > int xfs_ilock_nowait(xfs_inode_t *, uint); > void xfs_iunlock(xfs_inode_t *, uint); > void xfs_ilock_demote(xfs_inode_t *, uint); > -int xfs_isilocked(xfs_inode_t *, uint); > +bool xfs_isilocked(struct xfs_inode *, uint); > uint xfs_ilock_data_map_shared(struct xfs_inode *); > uint xfs_ilock_attr_map_shared(struct xfs_inode *); > > -- > 2.26.2 >
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index c06129cffba9..1fdf8c7eb990 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -345,9 +345,34 @@ xfs_ilock_demote( } #if defined(DEBUG) || defined(XFS_WARN) -int +static inline bool +__xfs_rwsem_islocked( + struct rw_semaphore *rwsem, + int lock_flags, + int shift) +{ + lock_flags >>= shift; + + if (!debug_locks) + return rwsem_is_locked(rwsem); + /* + * If the shared flag is not set, pass 0 to explicitly check for + * exclusive access to the lock. If the shared flag is set, we typically + * want to make sure the lock is at least held in shared mode + * (i.e., shared | excl) but we don't necessarily care that it might + * actually be held exclusive. Therefore, pass -1 to check whether the + * lock is held in any mode rather than one of the explicit shared mode + * values (1 or 2)." + */ + if (lock_flags & (1 << XFS_SHARED_LOCK_SHIFT)) { + return lockdep_is_held_type(rwsem, -1); + } + return lockdep_is_held_type(rwsem, 0); +} + +bool xfs_isilocked( - xfs_inode_t *ip, + struct xfs_inode *ip, uint lock_flags) { if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { @@ -362,15 +387,13 @@ xfs_isilocked( return rwsem_is_locked(&ip->i_mmaplock.mr_lock); } - if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { - if (!(lock_flags & XFS_IOLOCK_SHARED)) - return !debug_locks || - lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0); - return rwsem_is_locked(&VFS_I(ip)->i_rwsem); + if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) { + return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem, lock_flags, + XFS_IOLOCK_FLAG_SHIFT); } ASSERT(0); - return 0; + return false; } #endif diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index e9a8bb184d1f..9cecd6c9c90c 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -268,12 +268,19 @@ static inline void xfs_ifunlock(struct xfs_inode *ip) * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield) * 1<<16 - 1<<32-1 -- lockdep annotation (integers) */ -#define XFS_IOLOCK_EXCL (1<<0) -#define XFS_IOLOCK_SHARED (1<<1) -#define XFS_ILOCK_EXCL (1<<2) -#define XFS_ILOCK_SHARED (1<<3) -#define XFS_MMAPLOCK_EXCL (1<<4) -#define XFS_MMAPLOCK_SHARED (1<<5) + +#define XFS_IOLOCK_FLAG_SHIFT 0 +#define XFS_ILOCK_FLAG_SHIFT 2 +#define XFS_MMAPLOCK_FLAG_SHIFT 4 + +#define XFS_SHARED_LOCK_SHIFT 1 + +#define XFS_IOLOCK_EXCL (1 << XFS_IOLOCK_FLAG_SHIFT) +#define XFS_IOLOCK_SHARED (XFS_IOLOCK_EXCL << XFS_SHARED_LOCK_SHIFT) +#define XFS_ILOCK_EXCL (1 << XFS_ILOCK_FLAG_SHIFT) +#define XFS_ILOCK_SHARED (XFS_ILOCK_EXCL << XFS_SHARED_LOCK_SHIFT) +#define XFS_MMAPLOCK_EXCL (1 << XFS_MMAPLOCK_FLAG_SHIFT) +#define XFS_MMAPLOCK_SHARED (XFS_MMAPLOCK_EXCL << XFS_SHARED_LOCK_SHIFT) #define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \ | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \ @@ -412,7 +419,7 @@ void xfs_ilock(xfs_inode_t *, uint); int xfs_ilock_nowait(xfs_inode_t *, uint); void xfs_iunlock(xfs_inode_t *, uint); void xfs_ilock_demote(xfs_inode_t *, uint); -int xfs_isilocked(xfs_inode_t *, uint); +bool xfs_isilocked(struct xfs_inode *, uint); uint xfs_ilock_data_map_shared(struct xfs_inode *); uint xfs_ilock_attr_map_shared(struct xfs_inode *);