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Subject[PATCH 1 of 2]: Make BH_Unwritten a first class bufferhead flag V2
Version 2:

- separate buffer_delay in generic code into buffer_delay
and buffer_unwritten
- include XFS changes as a second patch:
- remove XFS use of buffer_delay to indicate buffer_unwritten
- remove XFS hack to silently clear "lost" unwritten flags

Version 1:

Currently, XFS uses BH_PrivateStart for flagging unwritten
extent state in a bufferhead. Recently, i found the long standing
mmap/unwritten extent conversion bug, and it was to do with
partial page invalidation not clearing the unwritten flag from
bufferheads attached to the page but beyond EOF. See here
for a full explaination:

http://oss.sgi.com/archives/xfs/2006-12/msg00196.html

The solution I have checked into the XFS dev tree involves
duplicating code from block_invalidatepage to clear the
unwritten flag from the bufferhead(s), and then calling
block_invalidatepage() to do the rest.

Christoph suggested that this would be better solved by
pushing the unwritten flag into the common buffer head flags
and just adding the call to discard_buffer():

http://oss.sgi.com/archives/xfs/2006-12/msg00239.html

The following patch makes BH_Unwritten a first class citizen.
Patch against 2.6.20-rc3.

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

---
fs/buffer.c | 4 +++-
fs/xfs/linux-2.6/xfs_linux.h | 10 ----------
include/linux/buffer_head.h | 2 ++
3 files changed, 5 insertions(+), 11 deletions(-)

Index: 2.6.x-xfs-new/fs/buffer.c
===================================================================
--- 2.6.x-xfs-new.orig/fs/buffer.c 2007-01-08 14:32:39.688130559 +1100
+++ 2.6.x-xfs-new/fs/buffer.c 2007-01-09 11:00:02.659186970 +1100
@@ -1437,6 +1437,7 @@ static void discard_buffer(struct buffer
clear_buffer_req(bh);
clear_buffer_new(bh);
clear_buffer_delay(bh);
+ clear_buffer_unwritten(bh);
unlock_buffer(bh);
}

@@ -1820,6 +1821,7 @@ static int __block_prepare_write(struct
continue;
}
if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
+ !buffer_unwritten(bh) &&
(block_start < from || block_end > to)) {
ll_rw_block(READ, 1, &bh);
*wait_bh++=bh;
@@ -2541,7 +2543,7 @@ int block_truncate_page(struct address_s
if (PageUptodate(page))
set_buffer_uptodate(bh);

- if (!buffer_uptodate(bh) && !buffer_delay(bh)) {
+ if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_unwritten(bh)) {
err = -EIO;
ll_rw_block(READ, 1, &bh);
wait_on_buffer(bh);
Index: 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_linux.h
===================================================================
--- 2.6.x-xfs-new.orig/fs/xfs/linux-2.6/xfs_linux.h 2006-12-12 12:05:17.000000000 +1100
+++ 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_linux.h 2007-01-09 10:58:30.459212715 +1100
@@ -109,16 +109,6 @@
#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
#endif

-/*
- * State flag for unwritten extent buffers.
- *
- * We need to be able to distinguish between these and delayed
- * allocate buffers within XFS. The generic IO path code does
- * not need to distinguish - we use the BH_Delay flag for both
- * delalloc and these ondisk-uninitialised buffers.
- */
-BUFFER_FNS(PrivateStart, unwritten);
-
#define restricted_chown xfs_params.restrict_chown.val
#define irix_sgid_inherit xfs_params.sgid_inherit.val
#define irix_symlink_mode xfs_params.symlink_mode.val
Index: 2.6.x-xfs-new/include/linux/buffer_head.h
===================================================================
--- 2.6.x-xfs-new.orig/include/linux/buffer_head.h 2006-12-12 12:06:29.000000000 +1100
+++ 2.6.x-xfs-new/include/linux/buffer_head.h 2007-01-09 10:58:30.535202804 +1100
@@ -34,6 +34,7 @@ enum bh_state_bits {
BH_Write_EIO, /* I/O error on write */
BH_Ordered, /* ordered write */
BH_Eopnotsupp, /* operation not supported (barrier) */
+ BH_Unwritten, /* Buffer is allocated on disk but not written */

BH_PrivateStart,/* not a state bit, but the first bit available
* for private allocation by other entities
@@ -126,6 +127,7 @@ BUFFER_FNS(Boundary, boundary)
BUFFER_FNS(Write_EIO, write_io_error)
BUFFER_FNS(Ordered, ordered)
BUFFER_FNS(Eopnotsupp, eopnotsupp)
+BUFFER_FNS(Unwritten, unwritten)

#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
#define touch_buffer(bh) mark_page_accessed(bh->b_page)
-
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