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| author | Darrick J. Wong | 2013-04-30 00:07:25 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2013-04-30 00:54:33 +0200 |
| commit | 7136851117744f1d291bed6d307432699d405109 (patch) | |
| tree | 6dc7d6bef45e24ad0d3d5d1b9290a81109758172 /fs/ext3 | |
| parent | mm/hugetlb: add more arch-defined huge_pte functions (diff) | |
| download | kernel-qcow2-linux-7136851117744f1d291bed6d307432699d405109.tar.gz kernel-qcow2-linux-7136851117744f1d291bed6d307432699d405109.tar.xz kernel-qcow2-linux-7136851117744f1d291bed6d307432699d405109.zip | |
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.
We must also flag journal "metadata" bios for stable writeout, since
file data can be written through the journal. Finally, the
MS_SNAP_STABLE mount flag (only used by ext3) is now superfluous, so get
rid of it.
[akpm@linux-foundation.org: rename _submit_bh()'s `flags' to `bio_flags', delobotomize the _submit_bh declaration]
[akpm@linux-foundation.org: teeny cleanup]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Artem Bityutskiy <dedekind1@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext3')
| -rw-r--r-- | fs/ext3/super.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c index fb5120a5505c..3dc48cc8b6eb 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -2067,7 +2067,6 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent) test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": "writeback"); - sb->s_flags |= MS_SNAP_STABLE; return 0; |