bounce:fix bug, avoid to flush dcache on slab page from jbd2.

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State Not Applicable, archived
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Andrew Morton March 14, 2013, 11:01 p.m.
On Thu, 14 Mar 2013 15:42:43 -0700 "Darrick J. Wong" <> wrote:

> Subject: [PATCH] mm: Make snapshotting pages for stable writes a per-bio operation
> Walking a bio's page mappings has proved problematic, so create a new bio flag
> to indicate that a bio's data needs to be snapshotted in order to guarantee
> stable pages during writeback.  Next, for the one user (ext3/jbd) of
> snapshotting, hook all the places where writes can be initiated without
> PG_writeback set, and set BIO_SNAP_STABLE there.  Finally, the MS_SNAP_STABLE
> mount flag (only used by ext3) is now superfluous, so get rid of it.

whoa, that looks way better.

Must do this though:

From: Andrew Morton <>
Subject: mm-make-snapshotting-pages-for-stable-writes-a-per-bio-operation-fix

rename _submit_bh()'s `flags' to `bio_flags', delobotomize the _submit_bh declaration

Cc: Adrian Hunter <>
Cc: Andy Lutomirski <>
Cc: Artem Bityutskiy <>
Cc: Darrick J. Wong <>
Cc: Jan Kara <>
Cc: Jens Axboe <>
Signed-off-by: Andrew Morton <>

 fs/buffer.c                 |    4 ++--
 include/linux/buffer_head.h |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)


diff -puN fs/buffer.c~mm-make-snapshotting-pages-for-stable-writes-a-per-bio-operation-fix fs/buffer.c
--- a/fs/buffer.c~mm-make-snapshotting-pages-for-stable-writes-a-per-bio-operation-fix
+++ a/fs/buffer.c
@@ -2949,7 +2949,7 @@  static void guard_bh_eod(int rw, struct
-int _submit_bh(int rw, struct buffer_head * bh, unsigned long flags)
+int _submit_bh(int rw, struct buffer_head * bh, unsigned long bio_flags)
 	struct bio *bio;
 	int ret = 0;
@@ -2984,7 +2984,7 @@  int _submit_bh(int rw, struct buffer_hea
 	bio->bi_end_io = end_bio_bh_io_sync;
 	bio->bi_private = bh;
-	bio->bi_flags |= flags;
+	bio->bi_flags |= bio_flags;
 	/* Take care of bh's that straddle the end of the device */
 	guard_bh_eod(rw, bio, bh);
diff -puN include/linux/buffer_head.h~mm-make-snapshotting-pages-for-stable-writes-a-per-bio-operation-fix include/linux/buffer_head.h
--- a/include/linux/buffer_head.h~mm-make-snapshotting-pages-for-stable-writes-a-per-bio-operation-fix
+++ a/include/linux/buffer_head.h
@@ -181,7 +181,7 @@  void ll_rw_block(int, int, struct buffer
 int sync_dirty_buffer(struct buffer_head *bh);
 int __sync_dirty_buffer(struct buffer_head *bh, int rw);
 void write_dirty_buffer(struct buffer_head *bh, int rw);
-int _submit_bh(int, struct buffer_head *, unsigned long);
+int _submit_bh(int rw, struct buffer_head *bh, unsigned long bio_flags);
 int submit_bh(int, struct buffer_head *);
 void write_boundary_block(struct block_device *bdev,
 			sector_t bblock, unsigned blocksize);