This patchset is intended to fix several bugs in nfsiostat and
'mountstats iostat', in particular when an <interval> is specified.
Specifically, the patches address the following issues when printing
multiple times:
* both nfsiostat and 'mountstats iostat':
- if <count> is also specified, the scripts sleep an additional
<interval> after printing <count> times, and parse mountstats
unnecessarily before checking the <count>
- if no nfs mounts are present when printing, the scripts output
a message that there are no nfs mounts, and exit immediately.
However, if multiple intervals are indicated, it makes more sense
to output the message and sleep until the next iteration; there
may be nfs mounts the next time through.
- if mountpoints are specified on the command-line, but are not
present during an iteration, the scripts crash.
* 'mountstats iostat':
- if an nfs filesystem is unmounted between iterations, the
script will crash attempting to reference the non-existent
mountpoint in the new mountstats file (or if another filesystem
type is mounted at that location, will instead crash while
comparing old and new stats)
- new nfs mounts are not detected
* nfsiostat:
- if a new nfs filesystem is mounted between iterations, the
script will crash attempting to reference the non-existent
mountpoint in the old mountstats file
- if a mountpoint is specified on the command-line, but topmost
mount there is not nfs, the script crashes while trying to
compare old and new stats
To address these issues, the patches do the following:
* when printing diff stats from previous iteration:
- verify that a device exists in the old mountstats before referencing it
- verify that both old and new fstypes are the same
* when filtering the current mountstats file:
- verify the device exists in the mountstats file before referencing it
- filter the list of nfs mountpoints each iostat iteration
* check for empty device list and output the 'No NFS mount points found'
message, but don't immediately exit the script
* merge the infinite loop and counted loop, and (for the counted loop)
decrement and check the count before sleeping and parsing the mountstats
file
Frank Sorenson (8):
mountstats/nfsiostat: add a function to return the fstype
mountstats: when printing iostats, verify that old and new types are
the same
nfsiostat: mirror how mountstats iostat prints the stats
nfsiostat: fix crash when filtering mountstats after unmount
nfsiostat: make comment explain mount/unmount more broadly
mountstats: filter for nfs mounts in a function, each iostat iteration
mountstats/nfsiostat: Move the checks for empty mountpoint list into
the print function
mountstats/nfsiostat: merge and rework the infinite and counted loops
tools/mountstats/mountstats.py | 102 ++++++++++++++++--------------
tools/nfs-iostat/nfs-iostat.py | 110 +++++++++++++--------------------
2 files changed, 100 insertions(+), 112 deletions(-)
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2.47.1
