Commit 0e4875b3 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

xfs: define locking primitives for realtime groups 



Define helper functions to lock all metadata inodes related to a
realtime group.  There's not much to look at now, but this will become
important when we add per-rtgroup metadata files and online fsck code
for them.

Signed-off-by: default avatarDarrick J. Wong <djwong@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 87fe4c34

fs/xfs/libxfs/xfs_rtgroup.c

+49 −0
Original line number Diff line number Diff line
@@ -149,3 +149,52 @@ xfs_update_last_rtgroup_size( 
	xfs_rtgroup_rele(rtg);

	return 0;

}



/* Lock metadata inodes associated with this rt group. */

void

xfs_rtgroup_lock(

	struct xfs_rtgroup	*rtg,

	unsigned int		rtglock_flags)

{

	ASSERT(!(rtglock_flags & ~XFS_RTGLOCK_ALL_FLAGS));

	ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED) ||

	       !(rtglock_flags & XFS_RTGLOCK_BITMAP));



	if (rtglock_flags & XFS_RTGLOCK_BITMAP)

		xfs_rtbitmap_lock(rtg_mount(rtg));

	else if (rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED)

		xfs_rtbitmap_lock_shared(rtg_mount(rtg), XFS_RBMLOCK_BITMAP);

}



/* Unlock metadata inodes associated with this rt group. */

void

xfs_rtgroup_unlock(

	struct xfs_rtgroup	*rtg,

	unsigned int		rtglock_flags)

{

	ASSERT(!(rtglock_flags & ~XFS_RTGLOCK_ALL_FLAGS));

	ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED) ||

	       !(rtglock_flags & XFS_RTGLOCK_BITMAP));



	if (rtglock_flags & XFS_RTGLOCK_BITMAP)

		xfs_rtbitmap_unlock(rtg_mount(rtg));

	else if (rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED)

		xfs_rtbitmap_unlock_shared(rtg_mount(rtg), XFS_RBMLOCK_BITMAP);

}



/*

 * Join realtime group metadata inodes to the transaction.  The ILOCKs will be

 * released on transaction commit.

 */

void

xfs_rtgroup_trans_join(

	struct xfs_trans	*tp,

	struct xfs_rtgroup	*rtg,

	unsigned int		rtglock_flags)

{

	ASSERT(!(rtglock_flags & ~XFS_RTGLOCK_ALL_FLAGS));

	ASSERT(!(rtglock_flags & XFS_RTGLOCK_BITMAP_SHARED));



	if (rtglock_flags & XFS_RTGLOCK_BITMAP)

		xfs_rtbitmap_trans_join(tp);

}

fs/xfs/libxfs/xfs_rtgroup.h

+16 −0
Original line number Diff line number Diff line
@@ -197,6 +197,19 @@ xfs_rtxnum_t xfs_rtgroup_extents(struct xfs_mount *mp, xfs_rgnumber_t rgno); 


int xfs_update_last_rtgroup_size(struct xfs_mount *mp,

		xfs_rgnumber_t prev_rgcount);



/* Lock the rt bitmap inode in exclusive mode */

#define XFS_RTGLOCK_BITMAP		(1U << 0)

/* Lock the rt bitmap inode in shared mode */

#define XFS_RTGLOCK_BITMAP_SHARED	(1U << 1)



#define XFS_RTGLOCK_ALL_FLAGS	(XFS_RTGLOCK_BITMAP | \

				 XFS_RTGLOCK_BITMAP_SHARED)



void xfs_rtgroup_lock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);

void xfs_rtgroup_unlock(struct xfs_rtgroup *rtg, unsigned int rtglock_flags);

void xfs_rtgroup_trans_join(struct xfs_trans *tp, struct xfs_rtgroup *rtg,

		unsigned int rtglock_flags);

#else

static inline void xfs_free_rtgroups(struct xfs_mount *mp,

		xfs_rgnumber_t first_rgno, xfs_rgnumber_t end_rgno)
@@ -212,6 +225,9 @@ static inline int xfs_initialize_rtgroups(struct xfs_mount *mp, 


# define xfs_rtgroup_extents(mp, rgno)		(0)

# define xfs_update_last_rtgroup_size(mp, rgno)	(-EOPNOTSUPP)

# define xfs_rtgroup_lock(rtg, gf)		((void)0)

# define xfs_rtgroup_unlock(rtg, gf)		((void)0)

# define xfs_rtgroup_trans_join(tp, rtg, gf)	((void)0)

#endif /* CONFIG_XFS_RT */



#endif /* __LIBXFS_RTGROUP_H */