xfs: refactor dfops init to attach to transaction

Most callers of xfs_defer_init() immediately attach the dfops
structure to a transaction. Add a transaction parameter to eliminate
much of this boilerplate code. This also helps self-document the
fact that many codepaths now expect a dfops pointer implicitly via
xfs_trans->t_dfops.

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_attr.c b/fs/xfs/libxfs/xfs_attr.c
index a14ab9b..8a7e2c0 100644 (file)
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -253,8 +253,7 @@ xfs_attr_set(
                        rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
        if (error)
                return error;
-       xfs_defer_init(&dfops, &firstblock);
-       args.trans->t_dfops = &dfops;
+       xfs_defer_init(args.trans, &dfops, &firstblock);
 
        xfs_ilock(dp, XFS_ILOCK_EXCL);
        error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
@@ -428,8 +427,7 @@ xfs_attr_remove(
                        &args.trans);
        if (error)
                return error;
-       xfs_defer_init(&dfops, &firstblock);
-       args.trans->t_dfops = &dfops;
+       xfs_defer_init(args.trans, &dfops, &firstblock);
 
        xfs_ilock(dp, XFS_ILOCK_EXCL);
        /*
@@ -600,7 +598,7 @@ xfs_attr_leaf_addname(
                 * Commit that transaction so that the node_addname() call
                 * can manage its own transactions.
                 */
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                error = xfs_attr3_leaf_to_node(args);
                if (error)
                        goto out_defer_cancel;
@@ -689,7 +687,8 @@ xfs_attr_leaf_addname(
                 * If the result is small enough, shrink it all into the inode.
                 */
                if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-                       xfs_defer_init(args->trans->t_dfops, args->firstblock);
+                       xfs_defer_init(NULL, args->trans->t_dfops,
+                                      args->firstblock);
                        error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
                        /* bp is gone due to xfs_da_shrink_inode */
                        if (error)
@@ -754,7 +753,7 @@ xfs_attr_leaf_removename(
         * If the result is small enough, shrink it all into the inode.
         */
        if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
                /* bp is gone due to xfs_da_shrink_inode */
                if (error)
@@ -883,7 +882,8 @@ restart:
                         */
                        xfs_da_state_free(state);
                        state = NULL;
-                       xfs_defer_init(args->trans->t_dfops, args->firstblock);
+                       xfs_defer_init(NULL, args->trans->t_dfops,
+                                      args->firstblock);
                        error = xfs_attr3_leaf_to_node(args);
                        if (error)
                                goto out_defer_cancel;
@@ -910,7 +910,7 @@ restart:
                 * in the index/blkno/rmtblkno/rmtblkcnt fields and
                 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
                 */
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                error = xfs_da3_split(state);
                if (error)
                        goto out_defer_cancel;
@@ -1008,7 +1008,8 @@ restart:
                 * Check to see if the tree needs to be collapsed.
                 */
                if (retval && (state->path.active > 1)) {
-                       xfs_defer_init(args->trans->t_dfops, args->firstblock);
+                       xfs_defer_init(NULL, args->trans->t_dfops,
+                                      args->firstblock);
                        error = xfs_da3_join(state);
                        if (error)
                                goto out_defer_cancel;
@@ -1133,7 +1134,7 @@ xfs_attr_node_removename(
         * Check to see if the tree needs to be collapsed.
         */
        if (retval && (state->path.active > 1)) {
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                error = xfs_da3_join(state);
                if (error)
                        goto out_defer_cancel;
@@ -1165,7 +1166,8 @@ xfs_attr_node_removename(
                        goto out;
 
                if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
-                       xfs_defer_init(args->trans->t_dfops, args->firstblock);
+                       xfs_defer_init(NULL, args->trans->t_dfops,
+                                      args->firstblock);
                        error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
                        /* bp is gone due to xfs_da_shrink_inode */
                        if (error)

diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 179259f..ab7c275 100644 (file)
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -480,7 +480,7 @@ xfs_attr_rmtval_set(
                 * extent and then crash then the block may not contain the
                 * correct metadata after log recovery occurs.
                 */
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                nmap = 1;
                error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
                                  blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock,
@@ -522,7 +522,7 @@ xfs_attr_rmtval_set(
 
                ASSERT(blkcnt > 0);
 
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                nmap = 1;
                error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
                                       blkcnt, &map, &nmap,
@@ -626,7 +626,7 @@ xfs_attr_rmtval_remove(
        blkcnt = args->rmtblkcnt;
        done = 0;
        while (!done) {
-               xfs_defer_init(args->trans->t_dfops, args->firstblock);
+               xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
                error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
                                    XFS_BMAPI_ATTRFORK, 1, args->firstblock,
                                    &done);

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 32d8d87..dfff840 100644 (file)
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -1050,8 +1050,7 @@ xfs_bmap_add_attrfork(
                        rsvd ? XFS_TRANS_RESERVE : 0, &tp);
        if (error)
                return error;
-       xfs_defer_init(&dfops, &firstblock);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstblock);
 
        xfs_ilock(ip, XFS_ILOCK_EXCL);
        error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ?
@@ -6025,8 +6024,7 @@ xfs_bmap_split_extent(
                        XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp);
        if (error)
                return error;
-       xfs_defer_init(&dfops, &firstfsb);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstfsb);
 
        xfs_ilock(ip, XFS_ILOCK_EXCL);
        xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);

diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index 560a7d1..6b25a94 100644 (file)
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -523,12 +523,19 @@ xfs_defer_init_op_type(
 /* Initialize a deferred operation. */
 void
 xfs_defer_init(
+       struct xfs_trans                *tp,
        struct xfs_defer_ops            *dop,
        xfs_fsblock_t                   *fbp)
 {
+       struct xfs_mount                *mp = NULL;
+
        memset(dop, 0, sizeof(struct xfs_defer_ops));
        *fbp = NULLFSBLOCK;
        INIT_LIST_HEAD(&dop->dop_intake);
        INIT_LIST_HEAD(&dop->dop_pending);
-       trace_xfs_defer_init(NULL, dop, _RET_IP_);
+       if (tp) {
+               tp->t_dfops = dop;
+               mp = tp->t_mountp;
+       }
+       trace_xfs_defer_init(mp, dop, _RET_IP_);
 }

diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index a02b2b7..56eaaac 100644 (file)
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -63,7 +63,8 @@ void xfs_defer_add(struct xfs_defer_ops *dop, enum xfs_defer_ops_type type,
                struct list_head *h);
 int xfs_defer_finish(struct xfs_trans **tp, struct xfs_defer_ops *dop);
 void xfs_defer_cancel(struct xfs_defer_ops *dop);
-void xfs_defer_init(struct xfs_defer_ops *dop, xfs_fsblock_t *fbp);
+void xfs_defer_init(struct xfs_trans *tp, struct xfs_defer_ops *dop,
+                   xfs_fsblock_t *fbp);
 bool xfs_defer_has_unfinished_work(struct xfs_defer_ops *dop);
 int xfs_defer_ijoin(struct xfs_defer_ops *dop, struct xfs_inode *ip);
 int xfs_defer_bjoin(struct xfs_defer_ops *dop, struct xfs_buf *bp);

diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index df67821..8dc3805 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -1691,8 +1691,7 @@ xfs_refcount_recover_cow_leftovers(
                trace_xfs_refcount_recover_extent(mp, agno, &rr->rr_rrec);
 
                /* Free the orphan record */
-               xfs_defer_init(&dfops, &fsb);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &fsb);
                agbno = rr->rr_rrec.rc_startblock - XFS_REFC_COW_START;
                fsb = XFS_AGB_TO_FSB(mp, agno, agbno);
                error = xfs_refcount_free_cow_extent(mp, tp->t_dfops, fsb,

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 6bea8df..1259e59 100644 (file)
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -972,8 +972,7 @@ xfs_alloc_file_space(
 
                xfs_trans_ijoin(tp, ip, 0);
 
-               xfs_defer_init(&dfops, &firstfsb);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &firstfsb);
                error = xfs_bmapi_write(tp, ip, startoffset_fsb,
                                        allocatesize_fsb, alloc_type, &firstfsb,
                                        resblks, imapp, &nimaps);
@@ -1043,8 +1042,7 @@ xfs_unmap_extent(
 
        xfs_trans_ijoin(tp, ip, 0);
 
-       xfs_defer_init(&dfops, &firstfsb);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstfsb);
        error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, &firstfsb,
                            done);
        if (error)
@@ -1347,8 +1345,7 @@ xfs_collapse_file_space(
                        goto out_trans_cancel;
                xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 
-               xfs_defer_init(&dfops, &first_block);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &first_block);
                error = xfs_bmap_collapse_extents(tp, ip, &next_fsb, shift_fsb,
                                &done, &first_block);
                if (error)
@@ -1427,8 +1424,7 @@ xfs_insert_file_space(
 
                xfs_ilock(ip, XFS_ILOCK_EXCL);
                xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
-               xfs_defer_init(&dfops, &first_block);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &first_block);
                error = xfs_bmap_insert_extents(tp, ip, &next_fsb, shift_fsb,
                                &done, stop_fsb, &first_block);
                if (error)
@@ -1615,7 +1611,7 @@ xfs_swap_extent_rmap(
 
                /* Unmap the old blocks in the source file. */
                while (tirec.br_blockcount) {
-                       xfs_defer_init(tp->t_dfops, &firstfsb);
+                       xfs_defer_init(tp, tp->t_dfops, &firstfsb);
                        trace_xfs_swap_extent_rmap_remap_piece(tip, &tirec);
 
                        /* Read extent from the source file */
@@ -1920,8 +1916,7 @@ xfs_swap_extents(
        error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
        if (error)
                goto out_unlock;
-       xfs_defer_init(&dfops, &firstfsb);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstfsb);
 
        /*
         * Lock and join the inodes to the tansaction so that transaction commit

diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 1ef38e1..c698e7f 100644 (file)
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -296,7 +296,7 @@ xfs_dquot_disk_alloc(
 
        trace_xfs_dqalloc(dqp);
 
-       xfs_defer_init(tp->t_dfops, &firstblock);
+       xfs_defer_init(tp, tp->t_dfops, &firstblock);
 
        xfs_ilock(quotip, XFS_ILOCK_EXCL);
        if (!xfs_this_quota_on(dqp->q_mount, dqp->dq_flags)) {
@@ -549,8 +549,7 @@ xfs_qm_dqread_alloc(
                        XFS_QM_DQALLOC_SPACE_RES(mp), 0, 0, &tp);
        if (error)
                goto err;
-       xfs_defer_init(&dfops, &firstblock);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstblock);
 
        error = xfs_dquot_disk_alloc(&tp, dqp, &bp);
        if (error)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index f456df2..04e1723 100644 (file)
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1195,8 +1195,7 @@ xfs_create(
        xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
        unlock_dp_on_error = true;
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
 
        /*
         * Reserve disk quota and the inode.
@@ -1451,8 +1450,7 @@ xfs_link(
                        goto error_return;
        }
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
 
        /*
         * Handle initial link state of O_TMPFILE inode
@@ -1584,8 +1582,7 @@ xfs_itruncate_extents_flags(
        ASSERT(first_unmap_block < last_block);
        unmap_len = last_block - first_unmap_block + 1;
        while (!done) {
-               xfs_defer_init(&dfops, &first_block);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &first_block);
                error = xfs_bunmapi(tp, ip, first_unmap_block, unmap_len, flags,
                                    XFS_ITRUNC_MAX_EXTENTS, &first_block,
                                    &done);
@@ -1816,8 +1813,7 @@ xfs_inactive_ifree(
        xfs_ilock(ip, XFS_ILOCK_EXCL);
        xfs_trans_ijoin(tp, ip, 0);
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
        error = xfs_ifree(tp, ip);
        if (error) {
                /*
@@ -2661,8 +2657,7 @@ xfs_remove(
        if (error)
                goto out_trans_cancel;
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
        error = xfs_dir_removename(tp, dp, name, ip->i_ino, &first_block,
                                   resblks);
        if (error) {
@@ -3026,8 +3021,7 @@ xfs_rename(
                goto out_trans_cancel;
        }
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
 
        /* RENAME_EXCHANGE is unique from here on. */
        if (flags & RENAME_EXCHANGE)

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 0c736c9..777c349 100644 (file)
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -254,8 +254,7 @@ xfs_iomap_write_direct(
         * From this point onwards we overwrite the imap pointer that the
         * caller gave to us.
         */
-       xfs_defer_init(&dfops, &firstfsb);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &firstfsb);
        nimaps = 1;
        error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
                                bmapi_flags, &firstfsb, resblks, imap,
@@ -717,8 +716,7 @@ xfs_iomap_write_allocate(
                        xfs_ilock(ip, XFS_ILOCK_EXCL);
                        xfs_trans_ijoin(tp, ip, 0);
 
-                       xfs_defer_init(&dfops, &first_block);
-                       tp->t_dfops = &dfops;
+                       xfs_defer_init(tp, &dfops, &first_block);
 
                        /*
                         * it is possible that the extents have changed since
@@ -878,8 +876,7 @@ xfs_iomap_write_unwritten(
                /*
                 * Modify the unwritten extent state of the buffer.
                 */
-               xfs_defer_init(&dfops, &firstfsb);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &firstfsb);
                nimaps = 1;
                error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
                                        XFS_BMAPI_CONVERT, &firstfsb, resblks,

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index b181b5f..940eb30 100644 (file)
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -4902,7 +4902,7 @@ xlog_recover_process_intents(
 #if defined(DEBUG) || defined(XFS_WARN)
        last_lsn = xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block);
 #endif
-       xfs_defer_init(&dfops, &firstfsb);
+       xfs_defer_init(NULL, &dfops, &firstfsb);
        while (lip != NULL) {
                /*
                 * We're done when we see something other than an intent.

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 8ea4ba0..bef7801 100644 (file)
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -428,8 +428,7 @@ retry:
 
        xfs_trans_ijoin(tp, ip, 0);
 
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
        nimaps = 1;
 
        /* Allocate the entire reservation as unwritten blocks. */
@@ -517,8 +516,7 @@ xfs_reflink_cancel_cow_blocks(
                        if (error)
                                break;
                } else if (del.br_state == XFS_EXT_UNWRITTEN || cancel_real) {
-                       xfs_defer_init(&dfops, &firstfsb);
-                       (*tpp)->t_dfops = &dfops;
+                       xfs_defer_init(*tpp, &dfops, &firstfsb);
 
                        /* Free the CoW orphan record. */
                        error = xfs_refcount_free_cow_extent(ip->i_mount,
@@ -701,8 +699,7 @@ xfs_reflink_end_cow(
                        goto prev_extent;
 
                /* Unmap the old blocks in the data fork. */
-               xfs_defer_init(&dfops, &firstfsb);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &firstfsb);
                rlen = del.br_blockcount;
                error = __xfs_bunmapi(tp, ip, del.br_startoff, &rlen, 0, 1,
                                &firstfsb);
@@ -1052,8 +1049,7 @@ xfs_reflink_remap_extent(
        /* Unmap the old blocks in the data fork. */
        rlen = unmap_len;
        while (rlen) {
-               xfs_defer_init(&dfops, &firstfsb);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &firstfsb);
                error = __xfs_bunmapi(tp, ip, destoff, &rlen, 0, 1, &firstfsb);
                if (error)
                        goto out_defer;

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 1c7d123..c102b0d 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -787,8 +787,7 @@ xfs_growfs_rt_alloc(
                xfs_ilock(ip, XFS_ILOCK_EXCL);
                xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 
-               xfs_defer_init(&dfops, &firstblock);
-               tp->t_dfops = &dfops;
+               xfs_defer_init(tp, &dfops, &firstblock);
                /*
                 * Allocate blocks to the bitmap file.
                 */

diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index a54f095..e50e973 100644 (file)
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -246,8 +246,7 @@ xfs_symlink(
         * Initialize the bmap freelist prior to calling either
         * bmapi or the directory create code.
         */
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
 
        /*
         * Allocate an inode for the symlink.
@@ -443,8 +442,7 @@ xfs_inactive_symlink_rmt(
         * Find the block(s) so we can inval and unmap them.
         */
        done = 0;
-       xfs_defer_init(&dfops, &first_block);
-       tp->t_dfops = &dfops;
+       xfs_defer_init(tp, &dfops, &first_block);
        nmaps = ARRAY_SIZE(mval);
        error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
                                mval, &nmaps, 0);