linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2017-04-30	ext4: replace BUG_ON with WARN_ONCE in ext4_end_bio()	Theodore Ts'o	1	-1/+10
	Add fallback code and a WARN_ONCE() call instead of a BUG_ON() in the ext4_end_bio() function. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-04-30	ext4: avoid unnecessary transaction stalls during writeback	Jan Kara	1	-0/+35
	Currently ext4_writepages() submits all pages with transaction started. When no page needs block allocation or extent conversion we can submit all dirty pages in the inode while holding a single transaction handle and when device is congested this can take significant amount of time. Thus ext4_writepages() can block transaction commits for extended periods of time. Take for example a simple benchmark simulating PostgreSQL database (pgioperf in mmtest). The benchmark runs 16 processes doing random reads from a huge file, one process doing random writes to the huge file, and one process doing sequential writes to a small files and frequently running fsync. With unpatched kernel transaction commits take on average ~18s with standard deviation of ~41s, top 5 commit times are: 274.466639s, 126.467347s, 86.992429s, 34.351563s, 31.517653s. After this patch transaction commits take on average 0.1s with standard deviation of 0.15s, top 5 commit times are: 0.563792s, 0.519980s, 0.509841s, 0.471700s, 0.469899s [ Modified so we use an explicit do_map flag instead of relying on io_end not being allocated, the since io_end->inode is needed for I/O error handling. -- tytso ] Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-04-30	ext4: preload block group descriptors	Andrew Perepechko	1	-0/+6
	With enabled meta_bg option block group descriptors reading IO is not sequential and requires optimization. Signed-off-by: Andrew Perepechko <andrew.perepechko@seagate.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-04-30	ext4: make ext4_shutdown() static	Eric Biggers	1	-1/+1
	Make the ext4_shutdown() function static, as suggested by running sparse ('make C=2 fs/ext4/'). This was the only such warning in fs/ext4/. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-04-30	ext4: support GETFSMAP ioctls	Darrick J. Wong	8	-5/+1027
	Support the GETFSMAP ioctls so that we can use the xfs free space management tools to probe ext4 as well. Note that this is a partial implementation -- we only report fixed-location metadata and free space; everything else is reported as "unknown". Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>