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xfs: define the on-disk rmap btree format

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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>
This commit is contained in:
Darrick J. Wong
2016-08-03 11:36:07 +10:00
committed by Dave Chinner
parent 673930c34a
commit 035e00acb5
13 changed files with 415 additions and 8 deletions
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67
fs/xfs/libxfs/xfs_rmap.h
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@@ -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);