xfs: rename xfs_bmapi to xfs_bmapi_write

Now that all the read-only users of xfs_bmapi have been converted to
use xfs_bmapi_read(), we can remove all the read-only handling cases
from xfs_bmapi().

Once this is done, rename xfs_bmapi to xfs_bmapi_write to reflect
the fact it is for allocation only. This enables us to kill the
XFS_BMAPI_WRITE flag as well.

Also clean up xfs_bmapi_write to the style used in the newly added
xfs_bmapi_read/delay functions.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 70a5f58..46c8aa2 100644
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -1578,9 +1578,8 @@
 	 */
 	nmap = 1;
 	ASSERT(args->firstblock != NULL);
-	error = xfs_bmapi(tp, dp, *bno, count,
-			xfs_bmapi_aflag(w)|XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|
-			XFS_BMAPI_CONTIG,
+	error = xfs_bmapi_write(tp, dp, *bno, count,
+			xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
 			args->firstblock, args->total, &map, &nmap,
 			args->flist);
 	if (error)
@@ -1602,9 +1601,8 @@
 		for (b = *bno, mapi = 0; b < *bno + count; ) {
 			nmap = MIN(XFS_BMAP_MAX_NMAP, count);
 			c = (int)(*bno + count - b);
-			error = xfs_bmapi(tp, dp, b, c,
-					xfs_bmapi_aflag(w)|XFS_BMAPI_WRITE|
-					XFS_BMAPI_METADATA,
+			error = xfs_bmapi_write(tp, dp, b, c,
+					xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
 					args->firstblock, args->total,
 					&mapp[mapi], &nmap, args->flist);
 			if (error)