linux/fs/ext3
Darrick J. Wong ffecfd1a72 block: optionally snapshot page contents to provide stable pages during write
This provides a band-aid to provide stable page writes on jbd without
needing to backport the fixed locking and page writeback bit handling
schemes of jbd2.  The band-aid works by using bounce buffers to snapshot
page contents instead of waiting.

For those wondering about the ext3 bandage -- fixing the jbd locking
(which was done as part of ext4dev years ago) is a lot of surgery, and
setting PG_writeback on data pages when we actually hold the page lock
dropped ext3 performance by nearly an order of magnitude.  If we're
going to migrate iscsi and raid to use stable page writes, the
complaints about high latency will likely return.  We might as well
centralize their page snapshotting thing to one place.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Tested-by: 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: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-21 17:22:20 -08:00
..
acl.c userns: Convert extN to support kuids and kgids in posix acls 2012-09-18 01:01:36 -07:00
acl.h fs: take the ACL checks to common code 2011-07-25 14:30:23 -04:00
balloc.c ext3: Avoid underflow of in ext3_trim_fs() 2012-11-19 21:36:12 +01:00
bitmap.c ext3: use memweight() 2012-07-30 17:25:16 -07:00
dir.c lseek: the "whence" argument is called "whence" 2012-12-17 17:15:12 -08:00
ext3_jbd.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
ext3.h Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2012-05-25 08:14:59 -07:00
file.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
fsync.c ext3: Check return value of blkdev_issue_flush() 2012-07-09 23:40:46 +02:00
hash.c ext3: return 32/64-bit dir name hash according to usage type 2012-05-15 23:34:39 +02:00
ialloc.c ext3: remove max_debt in find_group_orlov() 2012-04-11 11:12:44 +02:00
inode.c ext3: drop if around WARN_ON 2012-12-13 16:33:24 +01:00
ioctl.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
Kconfig ext3: default to ordered mode 2010-07-23 12:50:55 +02:00
Makefile [PATCH] ext3: uninline large functions 2006-12-07 08:39:35 -08:00
namei.c ext3: ext3_bread usage audit 2012-10-09 23:21:42 +02:00
namei.h ext3: ext3_bread usage audit 2012-10-09 23:21:42 +02:00
resize.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
super.c block: optionally snapshot page contents to provide stable pages during write 2013-02-21 17:22:20 -08:00
symlink.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
xattr_security.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
xattr_trusted.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
xattr_user.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
xattr.c ext3: move headers to fs/ext3/ 2012-03-31 16:03:16 -04:00
xattr.h fs/vfs/security: pass last path component to LSM on inode creation 2011-02-01 11:12:29 -05:00