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xfs: define locking primitives for realtime groups

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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: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-11-03 20:19:05 -08:00
parent 87fe4c34a3
commit 0e4875b3fb
2 changed files with 65 additions and 0 deletions
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49
fs/xfs/libxfs/xfs_rtgroup.c
View File

@ -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);
}

16
fs/xfs/libxfs/xfs_rtgroup.h
View File

@ -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 */