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authorDarrick J. Wong <darrick.wong@oracle.com>2016-08-03 04:36:07 +0300
committerDave Chinner <david@fromorbit.com>2016-08-03 04:36:07 +0300
commit035e00acb5c719bd003639b90716a7e94e023b73 (patch)
treebf4db815b139e959b9ecc06e35f4c1c8ddcb68ca /fs/xfs/libxfs/xfs_rmap.h
parent673930c34a4500c616cf9b2bbe1ae131ead2e155 (diff)
downloadlinux-035e00acb5c719bd003639b90716a7e94e023b73.tar.xz
xfs: define the on-disk rmap btree format
Originally-From: Dave Chinner <dchinner@redhat.com> Now we have all the surrounding call infrastructure in place, we can start filling out the rmap btree implementation. Start with the on-disk btree format; add everything needed to read, write and manipulate rmap btree blocks. This prepares the way for adding the btree operations implementation. [darrick: record owner and offset info in rmap btree] [darrick: fork, bmbt and unwritten state in rmap btree] [darrick: flags are a separate field in xfs_rmap_irec] [darrick: calculate maxlevels separately] [darrick: move the 'unwritten' bit into unused parts of rm_offset] Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_rmap.h')
-rw-r--r--fs/xfs/libxfs/xfs_rmap.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_rmap.h b/fs/xfs/libxfs/xfs_rmap.h
index dbf0301e9ae1..e7a670459fea 100644
--- a/fs/xfs/libxfs/xfs_rmap.h
+++ b/fs/xfs/libxfs/xfs_rmap.h
@@ -68,6 +68,73 @@ xfs_rmap_skip_owner_update(
struct xfs_buf;
+static inline __u64
+xfs_rmap_irec_offset_pack(
+ const struct xfs_rmap_irec *irec)
+{
+ __u64 x;
+
+ x = XFS_RMAP_OFF(irec->rm_offset);
+ if (irec->rm_flags & XFS_RMAP_ATTR_FORK)
+ x |= XFS_RMAP_OFF_ATTR_FORK;
+ if (irec->rm_flags & XFS_RMAP_BMBT_BLOCK)
+ x |= XFS_RMAP_OFF_BMBT_BLOCK;
+ if (irec->rm_flags & XFS_RMAP_UNWRITTEN)
+ x |= XFS_RMAP_OFF_UNWRITTEN;
+ return x;
+}
+
+static inline int
+xfs_rmap_irec_offset_unpack(
+ __u64 offset,
+ struct xfs_rmap_irec *irec)
+{
+ if (offset & ~(XFS_RMAP_OFF_MASK | XFS_RMAP_OFF_FLAGS))
+ return -EFSCORRUPTED;
+ irec->rm_offset = XFS_RMAP_OFF(offset);
+ if (offset & XFS_RMAP_OFF_ATTR_FORK)
+ irec->rm_flags |= XFS_RMAP_ATTR_FORK;
+ if (offset & XFS_RMAP_OFF_BMBT_BLOCK)
+ irec->rm_flags |= XFS_RMAP_BMBT_BLOCK;
+ if (offset & XFS_RMAP_OFF_UNWRITTEN)
+ irec->rm_flags |= XFS_RMAP_UNWRITTEN;
+ return 0;
+}
+
+static inline void
+xfs_owner_info_unpack(
+ struct xfs_owner_info *oinfo,
+ uint64_t *owner,
+ uint64_t *offset,
+ unsigned int *flags)
+{
+ unsigned int r = 0;
+
+ *owner = oinfo->oi_owner;
+ *offset = oinfo->oi_offset;
+ if (oinfo->oi_flags & XFS_OWNER_INFO_ATTR_FORK)
+ r |= XFS_RMAP_ATTR_FORK;
+ if (oinfo->oi_flags & XFS_OWNER_INFO_BMBT_BLOCK)
+ r |= XFS_RMAP_BMBT_BLOCK;
+ *flags = r;
+}
+
+static inline void
+xfs_owner_info_pack(
+ struct xfs_owner_info *oinfo,
+ uint64_t owner,
+ uint64_t offset,
+ unsigned int flags)
+{
+ oinfo->oi_owner = owner;
+ oinfo->oi_offset = XFS_RMAP_OFF(offset);
+ oinfo->oi_flags = 0;
+ if (flags & XFS_RMAP_ATTR_FORK)
+ oinfo->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
+ if (flags & XFS_RMAP_BMBT_BLOCK)
+ oinfo->oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
+}
+
int xfs_rmap_alloc(struct xfs_trans *tp, struct xfs_buf *agbp,
xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
struct xfs_owner_info *oinfo);