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fsck.zfs: implement 4/8 exit codes as suggested in manpage

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Update the fsck.zfs helper to bubble up some already-known-about 
errors if they are detected in the pool.

health=degraded => 4/"Filesystem errors left uncorrected"
health=faulted && dataset in /etc/fstab => 8/"Operational error"
pool not found => 8/"Operational error"
everything else => 0

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11806
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2021-03-31 19:49:56 +02:00
committed by Brian Behlendorf
parent bfdd001679
commit dc52c0d725
5 changed files with 64 additions and 20 deletions
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man/man8/fsck.zfs.8
+15 -11
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@@ -22,24 +22,27 @@
.\"
.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
.\"
.TH FSCK.ZFS 8 "Aug 24, 2020" OpenZFS
.TH FSCK.ZFS 8 "Mar 27, 2021" OpenZFS
.SH NAME
fsck.zfs \- Dummy ZFS filesystem checker.
.SH SYNOPSIS
.LP
.BI "fsck.zfs [" "options" "] <" "dataset" ">"
.BI "fsck.zfs [" "options" "] <" "dataset" ">…"
.SH DESCRIPTION
.LP
\fBfsck.zfs\fR is a shell stub that does nothing and always returns
true. It is installed by ZoL because some Linux distributions expect
a fsck helper for all filesystems.
\fBfsck.zfs\fR is a thin shell wrapper that at most checks the status of a
dataset's container pool. It is installed by OpenZFS because some Linux
distributions expect a fsck helper for all filesystems.
.LP
If more than one \fIdataset\fR is specified, each is checked in turn
and results binary ored.
.SH OPTIONS
.HP
All \fIoptions\fR and the \fIdataset\fR are ignored.
All \fIoptions\fR are ignored.
.SH "NOTES"
.LP
@@ -47,14 +50,15 @@ ZFS datasets are checked by running \fBzpool scrub\fR on the
containing pool. An individual ZFS dataset is never checked
independently of its pool, which is unlike a regular filesystem.
.SH "BUGS"
.LP
On some systems, if the \fIdataset\fR is in a degraded pool, then it
might be appropriate for \fBfsck.zfs\fR to return exit code 4 to
indicate an uncorrected filesystem error.
However, the
.BR fsck (8)
interface still allows it to communicate some errors:
if the \fIdataset\fR is in a degraded pool, then \fBfsck.zfs\fR will
return exit code 4 to indicate an uncorrected filesystem error.
.LP
Similarly, if the \fIdataset\fR is in a faulted pool and has a legacy
/etc/fstab record, then \fBfsck.zfs\fR should return exit code 8 to
/etc/fstab record, then \fBfsck.zfs\fR will return exit code 8 to
indicate a fatal operational error.
.SH "AUTHORS"