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xfs: remove unused btree cursor bc_private.a.dfops field

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The xfs_btree_cur.bc_private.a.dfops field is only ever initialized
by the refcountbt cursor init function. The only caller of that
function with a non-NULL dfops is from deferred completion context,
which already has attached to ->t_dfops.

In addition to that, the only actual reference of a.dfops is the
cursor duplication function, which means the field is effectively
unused.

Remove the dfops field from the bc_private.a union. Any future users
can acquire the dfops from the transaction. This patch does not
change behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2018-07-11 22:26:17 -07:00 committed by Darrick J. Wong
parent 42b394a925
commit ed7ef8e55c
7 changed files with 9 additions and 13 deletions
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1
fs/xfs/libxfs/xfs_btree.h
View file

@ -209,7 +209,6 @@ typedef struct xfs_btree_cur
union {
struct { /* needed for BNO, CNT, INO */
struct xfs_buf *agbp; /* agf/agi buffer pointer */
struct xfs_defer_ops *dfops; /* deferred updates */
xfs_agnumber_t agno; /* ag number */
union xfs_btree_cur_private priv;
} a;

4
fs/xfs/libxfs/xfs_refcount.c
View file

@ -1132,7 +1132,7 @@ xfs_refcount_finish_one(
if (!agbp)
return -EFSCORRUPTED;
rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, dfops);
rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno);
if (!rcur) {
error = -ENOMEM;
goto out_cur;
@ -1666,7 +1666,7 @@ xfs_refcount_recover_cow_leftovers(
error = -ENOMEM;
goto out_trans;
}
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, NULL);
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno);
/* Find all the leftover CoW staging extents. */
memset(&low, 0, sizeof(low));

7
fs/xfs/libxfs/xfs_refcount_btree.c
View file

@ -27,8 +27,7 @@ xfs_refcountbt_dup_cursor(
struct xfs_btree_cur *cur)
{
return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
cur->bc_private.a.agbp, cur->bc_private.a.agno,
cur->bc_private.a.dfops);
cur->bc_private.a.agbp, cur->bc_private.a.agno);
}
STATIC void
@ -323,8 +322,7 @@ xfs_refcountbt_init_cursor(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buf *agbp,
xfs_agnumber_t agno,
struct xfs_defer_ops *dfops)
xfs_agnumber_t agno)
{
struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
struct xfs_btree_cur *cur;
@ -344,7 +342,6 @@ xfs_refcountbt_init_cursor(
cur->bc_private.a.agbp = agbp;
cur->bc_private.a.agno = agno;
cur->bc_private.a.dfops = dfops;
cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
cur->bc_private.a.priv.refc.nr_ops = 0;

4
fs/xfs/libxfs/xfs_refcount_btree.h
View file

@ -44,8 +44,8 @@ struct xfs_mount;
((index) - 1) * sizeof(xfs_refcount_ptr_t)))
extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno,
struct xfs_defer_ops *dfops);
struct xfs_trans *tp, struct xfs_buf *agbp,
xfs_agnumber_t agno);
extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);

2
fs/xfs/scrub/common.c
View file

@ -499,7 +499,7 @@ xfs_scrub_ag_btcur_init(
/* Set up a refcountbt cursor for cross-referencing. */
if (sa->agf_bp && xfs_sb_version_hasreflink(&mp->m_sb)) {
sa->refc_cur = xfs_refcountbt_init_cursor(mp, sc->tp,
sa->agf_bp, agno, NULL);
sa->agf_bp, agno);
if (!sa->refc_cur)
goto err;
}

2
fs/xfs/xfs_fsmap.c
View file

@ -214,7 +214,7 @@ xfs_getfsmap_is_shared(
/* Are there any shared blocks here? */
flen = 0;
cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp,
info->agno, NULL);
info->agno);
error = xfs_refcount_find_shared(cur, rec->rm_startblock,
rec->rm_blockcount, &fbno, &flen, false);

2
fs/xfs/xfs_reflink.c
View file

@ -157,7 +157,7 @@ xfs_reflink_find_shared(
if (!agbp)
return -ENOMEM;
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno, NULL);
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno);
error = xfs_refcount_find_shared(cur, agbno, aglen, fbno, flen,
find_end_of_shared);