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
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.h
file.c
fsync.c
hash.c
ialloc.c
inode.c	ext3: drop if around WARN_ON	2012-12-13 16:33:24 +01:00
ioctl.c
Kconfig
Makefile
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
super.c	block: optionally snapshot page contents to provide stable pages during write	2013-02-21 17:22:20 -08:00
symlink.c
xattr_security.c
xattr_trusted.c
xattr_user.c
xattr.c
xattr.h