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Subject[PATCH] Teach do_mpage_readpage() about unwritten buffers
Teach do_mpage_readpage() about unwritten extents so we can
always map them in get_blocks rather than they are are holes on
read. Allows setup_swap_extents() to use preallocated files on XFS
filesystems for swap files without ever needing to convert them.

Signed-Off-By: Dave Chinner <dgc@sgi.com>

---
fs/mpage.c | 5 +++--
fs/xfs/linux-2.6/xfs_aops.c | 13 +++----------
2 files changed, 6 insertions(+), 12 deletions(-)
Index: 2.6.x-xfs-new/fs/mpage.c
===================================================================
--- 2.6.x-xfs-new.orig/fs/mpage.c 2007-05-29 16:17:59.000000000 +1000
+++ 2.6.x-xfs-new/fs/mpage.c 2007-06-27 22:39:35.568852270 +1000
@@ -207,7 +207,8 @@ do_mpage_readpage(struct bio *bio, struc
* Map blocks using the result from the previous get_blocks call first.
*/
nblocks = map_bh->b_size >> blkbits;
- if (buffer_mapped(map_bh) && block_in_file > *first_logical_block &&
+ if (buffer_mapped(map_bh) && !buffer_unwritten(map_bh) &&
+ block_in_file > *first_logical_block &&
block_in_file < (*first_logical_block + nblocks)) {
unsigned map_offset = block_in_file - *first_logical_block;
unsigned last = nblocks - map_offset;
@@ -242,7 +243,7 @@ do_mpage_readpage(struct bio *bio, struc
*first_logical_block = block_in_file;
}

- if (!buffer_mapped(map_bh)) {
+ if (!buffer_mapped(map_bh) || buffer_unwritten(map_bh)) {
fully_mapped = 0;
if (first_hole == blocks_per_page)
first_hole = page_block;
Index: 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_aops.c
===================================================================
--- 2.6.x-xfs-new.orig/fs/xfs/linux-2.6/xfs_aops.c 2007-06-05 22:14:39.000000000 +1000
+++ 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_aops.c 2007-06-27 22:39:29.545636749 +1000
@@ -1340,16 +1340,9 @@ __xfs_get_blocks(
return 0;

if (iomap.iomap_bn != IOMAP_DADDR_NULL) {
- /*
- * For unwritten extents do not report a disk address on
- * the read case (treat as if we're reading into a hole).
- */
- if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) {
- xfs_map_buffer(bh_result, &iomap, offset,
- inode->i_blkbits);
- }
- if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) {
- if (direct)
+ xfs_map_buffer(bh_result, &iomap, offset, inode->i_blkbits);
+ if (iomap.iomap_flags & IOMAP_UNWRITTEN) {
+ if (create && direct)
bh_result->b_private = inode;
set_buffer_unwritten(bh_result);
}
-
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