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nfsd: report per-export stats

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Collect some nfsd stats per export in addition to the global stats.

A new nfsdfs export_stats file is created.  It uses the same ops as the
exports file to iterate the export entries and we use the file's name to
determine the reported info per export.  For example:

 $ cat /proc/fs/nfsd/export_stats
 # Version 1.1
 # Path Client Start-time
 #	Stats
 /test	localhost	92
	fh_stale: 0
	io_read: 9
	io_write: 1

Every export entry reports the start time when stats collection
started, so stats collecting scripts can know if stats where reset
between samples.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Amir Goldstein
2021-01-06 09:52:36 +02:00
committed by Chuck Lever
parent e567b98ce9
commit 20ad856e47
7 changed files with 92 additions and 16 deletions
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3
fs/nfsd/nfsctl.c
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@@ -32,6 +32,7 @@
enum {
NFSD_Root = 1,
NFSD_List,
NFSD_Export_Stats,
NFSD_Export_features,
NFSD_Fh,
NFSD_FO_UnlockIP,
@@ -1348,6 +1349,8 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
/* Per-export io stats use same ops as exports file */
[NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
&export_features_operations, S_IRUGO},
[NFSD_FO_UnlockIP] = {"unlock_ip",