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

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>

diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index cc94ac7..b986a8f 100644 (file)
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -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;

diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index 9dda6fd..8e330a1 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -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));

diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c
index b719379..393aa88 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount_btree.c
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -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;

diff --git a/fs/xfs/libxfs/xfs_refcount_btree.h b/fs/xfs/libxfs/xfs_refcount_btree.h
index d2852b6..801c2c7 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount_btree.h
+++ b/fs/xfs/libxfs/xfs_refcount_btree.h
@@ -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);
 

diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 70e70c6..385fa5b 100644 (file)
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -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;
        }

diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index c7157bc..297d7ce 100644 (file)
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -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);

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 0ac0706..90457c2 100644 (file)
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -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);