[PATCH 0/4 V5] xfs: new global stats in sysfs

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Hi all-

Here is another pass at the series to add new global stats to sysfs.
----------history---------------
V5:
-optimization of sysfs_ops function.
-style fixups
V4:
-whitespace fixup of patch 1
-add patch 4 (sysfs ops consolidation - dbg, stats, log)
V3:
-style fixups and removal of extraneous printk.
V2:
-style fixups.
V1:
--------------------------------

The series provides the beginnings of the infrastructure for per-fs
stats (in addition to global accumulative stats).

We already have per-fs information in /sys, so it makes sense to
have per-fs stats there too.  As a first step, moving existing
global stats infrastructure to /sys will allow us to re-use that
sysfs code for per-fs stats as well.

Patch 1 handles the bring-up and tear down of xfs/stats directory
structure in sysfs when an fs is mounted. The directory contains
the stats file and the stats_clear file. The stats file contents mimic
those of /proc/fs/xfs/stat. The stats_clear file is empty, and much
like the current stat_clear command, handles the zeroing of the stats
file when a "1" is echoed to the stats_clear file.

Patch 2 creates the symlink for stats from procfs to sysfs.

Patch 3 removes the now unused portions of procfs for stat.

Patch 4 consolidates the sysfs ops for dbg, stats, log.

Once again, comments and questions are welcome.

Thanks-
Bill

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