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xfs: fold xfs_bmbt_init_common into xfs_bmbt_init_cursor

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Make the levels initialization in xfs_bmbt_init_cursor conditional
and merge the two helpers.

This requires the fakeroot case to now pass a -1 whichfork directly
into xfs_bmbt_init_cursor, and some special casing for that, but
at least this scheme to deal with the fake btree root is handled and
documented in once place now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: tidy up a multline ternary]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-02-22 12:39:44 -08:00 committed by Darrick J. Wong
parent 42e357c806
commit 802f91f7b1
1 changed files with 27 additions and 29 deletions
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56
fs/xfs/libxfs/xfs_bmap_btree.c
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@ -544,27 +544,10 @@ const struct xfs_btree_ops xfs_bmbt_ops = {
.keys_contiguous = xfs_bmbt_keys_contiguous,
};
static struct xfs_btree_cur *
xfs_bmbt_init_common(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_btree_cur *cur;
ASSERT(whichfork != XFS_COW_FORK);
cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_BMAP, &xfs_bmbt_ops,
mp->m_bm_maxlevels[whichfork], xfs_bmbt_cur_cache);
cur->bc_ino.ip = ip;
cur->bc_bmap.allocated = 0;
return cur;
}
/*
* Allocate a new bmap btree cursor.
* Create a new bmap btree cursor.
*
* For staging cursors -1 in passed in whichfork.
*/
struct xfs_btree_cur *
xfs_bmbt_init_cursor(
@ -573,15 +556,34 @@ xfs_bmbt_init_cursor(
struct xfs_inode *ip,
int whichfork)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
struct xfs_btree_cur *cur;
unsigned int maxlevels;
cur = xfs_bmbt_init_common(mp, tp, ip, whichfork);
ASSERT(whichfork != XFS_COW_FORK);
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
cur->bc_ino.forksize = xfs_inode_fork_size(ip, whichfork);
/*
* The Data fork always has larger maxlevel, so use that for staging
* cursors.
*/
switch (whichfork) {
case XFS_STAGING_FORK:
maxlevels = mp->m_bm_maxlevels[XFS_DATA_FORK];
break;
default:
maxlevels = mp->m_bm_maxlevels[whichfork];
break;
}
cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_BMAP, &xfs_bmbt_ops,
maxlevels, xfs_bmbt_cur_cache);
cur->bc_ino.ip = ip;
cur->bc_ino.whichfork = whichfork;
cur->bc_bmap.allocated = 0;
if (whichfork != XFS_STAGING_FORK) {
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
cur->bc_ino.forksize = xfs_inode_fork_size(ip, whichfork);
}
return cur;
}
@ -610,11 +612,7 @@ xfs_bmbt_stage_cursor(
{
struct xfs_btree_cur *cur;
/* data fork always has larger maxheight */
cur = xfs_bmbt_init_common(mp, NULL, ip, XFS_DATA_FORK);
/* Don't let anyone think we're attached to the real fork yet. */
cur->bc_ino.whichfork = XFS_STAGING_FORK;
cur = xfs_bmbt_init_cursor(mp, NULL, ip, XFS_STAGING_FORK);
xfs_btree_stage_ifakeroot(cur, ifake);
return cur;
}