linux-toradex.git/fs/xfs/xfs_sysctl.c, branch v4.9.37

xfs: garbage collect old cowextsz reservations

2016-10-05T23:26:28+00:00

Trim CoW reservations made on behalf of a cowextsz hint if they get too
old or we run low on quota, so long as we don't have dirty data awaiting
writeback or directio operations in progress.

Garbage collection of the cowextsize extents are kept separate from
prealloc extent reaping because setting the CoW prealloc lifetime to a
(much) higher value than the regular prealloc extent lifetime has been
useful for combatting CoW fragmentation on VM hosts where the VMs
experience bursty write behaviors and we can keep the utilization ratios
low enough that we don't start to run out of space.  IOWs, it benefits
us to keep the CoW fork reservations around for as long as we can unless
we run out of blocks or hit inode reclaim.

Signed-off-by: Darrick J. Wong 
Reviewed-by: Christoph Hellwig

xfs: pass xfsstats structures to handlers and macros

2015-10-11T18:19:45+00:00

This patch is the next step toward per-fs xfs stats. The patch makes
the show and clear routines able to handle any stats structure
associated with a kobject.

Instead of a single global xfsstats structure, add kobject and a pointer
to a per-cpu struct xfsstats. Modify the macros that manipulate the stats
accordingly: XFS_STATS_INC, XFS_STATS_DEC, and XFS_STATS_ADD now access
xfsstats->xs_stats.

The sysfs functions need to get from the kobject back to the xfsstats
structure which contains it, and pass the pointer to the ->xs_stats
percpu structure into the show & clear routines.

Signed-off-by: Bill O'Donnell 
Reviewed-by: Eric Sandeen 
Signed-off-by: Dave Chinner

xfs: create global stats and stats_clear in sysfs

2015-10-11T18:15:45+00:00

Currently, xfs global stats are in procfs. This patch introduces
(replicates) the global stats in sysfs. Additionally a stats_clear file
is introduced in sysfs.

Signed-off-by: Bill O'Donnell 
Reviewed-by: Eric Sandeen 
Signed-off-by: Dave Chinner

xfs: remove deprecated sysctls

2015-01-08T23:47:43+00:00

xfsbufd_centisecs and age_buffer_centisecs were due for removal in
3.14. We forgot to do that - it's now well past time to remove these
deprecated, unused sysctls.

Signed-off-by: Dave Chinner 
Reviewed-by: Eric Sandeen 
Signed-off-by: Dave Chinner

xfs: Convert use of typedef ctl_table to struct ctl_table

2013-06-17T22:42:25+00:00

This typedef is unnecessary and should just be removed.

Signed-off-by: Joe Perches 
Acked-by: Dave Chinner 
Reviewed-by: Ben Myers 
Signed-off-by: Ben Myers

xfs: add background scanning to clear eofblocks inodes

2012-11-08T21:34:59+00:00

Create a new mount workqueue and delayed_work to enable background
scanning and freeing of eofblocks inodes. The scanner kicks in once
speculative preallocation occurs and stops requeueing itself when
no eofblocks inodes exist.

The scan interval is based on the new
'speculative_prealloc_lifetime' tunable (default to 5m). The
background scanner performs unfiltered, best effort scans (which
skips inodes under lock contention or with a dirty cache mapping).

Signed-off-by: Brian Foster 
Reviewed-by: Mark Tinguely 
Reviewed-by: Dave Chinner 
Signed-off-by: Ben Myers

xfs: remove subdirectories

2011-08-12T21:21:35+00:00

Use the move from Linux 2.6 to Linux 3.x as an excuse to kill the
annoying subdirectories in the XFS source code.  Besides the large
amount of file rename the only changes are to the Makefile, a few
files including headers with the subdirectory prefix, and the binary
sysctl compat code that includes a header under fs/xfs/ from
kernel/.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Alex Elder