[XFS] move xfs_bmbt_newroot to common code

xfs_bmbt_newroot is a mostly generic implementation of moving from an
inode root to a real block based root. So move it to xfs_btree.c where it
can use all the nice infrastructure there and make it pointer size
agnostic

The new name for it is xfs_btree_new_iroot, following the old naming but
making it clear we're dealing with the root in inode case here, and to
avoid confusion with xfs_btree_new_root which is used for the not inode
rooted case.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32201a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 8de884c4dab7..3b6e01dea669 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -2469,6 +2469,107 @@ error0:
 }
 
 /*
+ * Copy the old inode root contents into a real block and make the
+ * broot point to it.
+ */
+int                                             /* error */
+xfs_btree_new_iroot(
+        struct xfs_btree_cur    *cur,           /* btree cursor */
+        int                     *logflags,      /* logging flags for inode */
+        int                     *stat)          /* return status - 0 fail */
+{
+        struct xfs_buf          *cbp;           /* buffer for cblock */
+        struct xfs_btree_block  *block;         /* btree block */
+        struct xfs_btree_block  *cblock;        /* child btree block */
+        union xfs_btree_key     *ckp;           /* child key pointer */
+        union xfs_btree_ptr     *cpp;           /* child ptr pointer */
+        union xfs_btree_key     *kp;            /* pointer to btree key */
+        union xfs_btree_ptr     *pp;            /* pointer to block addr */
+        union xfs_btree_ptr     nptr;           /* new block addr */
+        int                     level;          /* btree level */
+        int                     error;          /* error return code */
+#ifdef DEBUG
+        int                     i;              /* loop counter */
+#endif
+
+        XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+        XFS_BTREE_STATS_INC(cur, newroot);
+
+        ASSERT(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE);
+
+        level = cur->bc_nlevels - 1;
+
+        block = xfs_btree_get_iroot(cur);
+        pp = xfs_btree_ptr_addr(cur, 1, block);
+
+        /* Allocate the new block. If we can't do it, we're toast. Give up. */
+        error = cur->bc_ops->alloc_block(cur, pp, &nptr, 1, stat);
+        if (error)
+                goto error0;
+        if (*stat == 0) {
+                XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+                return 0;
+        }
+        XFS_BTREE_STATS_INC(cur, alloc);
+
+        /* Copy the root into a real block. */
+        error = xfs_btree_get_buf_block(cur, &nptr, 0, &cblock, &cbp);
+        if (error)
+                goto error0;
+
+        memcpy(cblock, block, xfs_btree_block_len(cur));
+
+        be16_add_cpu(&block->bb_level, 1);
+        xfs_btree_set_numrecs(block, 1);
+        cur->bc_nlevels++;
+        cur->bc_ptrs[level + 1] = 1;
+
+        kp = xfs_btree_key_addr(cur, 1, block);
+        ckp = xfs_btree_key_addr(cur, 1, cblock);
+        xfs_btree_copy_keys(cur, ckp, kp, xfs_btree_get_numrecs(cblock));
+
+        cpp = xfs_btree_ptr_addr(cur, 1, cblock);
+#ifdef DEBUG
+        for (i = 0; i < be16_to_cpu(cblock->bb_numrecs); i++) {
+                error = xfs_btree_check_ptr(cur, pp, i, level);
+                if (error)
+                        goto error0;
+        }
+#endif
+        xfs_btree_copy_ptrs(cur, cpp, pp, xfs_btree_get_numrecs(cblock));
+
+#ifdef DEBUG
+        error = xfs_btree_check_ptr(cur, &nptr, 0, level);
+        if (error)
+                goto error0;
+#endif
+        xfs_btree_copy_ptrs(cur, pp, &nptr, 1);
+
+        xfs_iroot_realloc(cur->bc_private.b.ip,
+                          1 - xfs_btree_get_numrecs(cblock),
+                          cur->bc_private.b.whichfork);
+
+        xfs_btree_setbuf(cur, level, cbp);
+
+        /*
+         * Do all this logging at the end so that
+         * the root is at the right level.
+         */
+        xfs_btree_log_block(cur, cbp, XFS_BB_ALL_BITS);
+        xfs_btree_log_keys(cur, cbp, 1, be16_to_cpu(cblock->bb_numrecs));
+        xfs_btree_log_ptrs(cur, cbp, 1, be16_to_cpu(cblock->bb_numrecs));
+
+        *logflags |=
+                XFS_ILOG_CORE | XFS_ILOG_FBROOT(cur->bc_private.b.whichfork);
+        *stat = 1;
+        XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+        return 0;
+error0:
+        XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+        return error;
+}
+
+/*
  * Allocate a new root block, fill it in.
  */
 int                             /* error */