Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 80 insertions, 0 deletions

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+.TH "BTRFS-SELECT-SUPER" "8" "Feb 28, 2024" "6.6.3" "BTRFS"
+.SH NAME
+btrfs-select-super \- overwrite primary superblock with a backup copy
+.SH SYNOPSIS
+.sp
+\fBbtrfs\-select\-super\fP \-s number <device>
+.SH DESCRIPTION
+.sp
+Destructively overwrite all copies of the superblock with a specified copy.
+This helps in certain cases, for example when write barriers were disabled
+during a power failure and not all superblocks were written, or if the primary
+superblock is damaged, e.g. accidentally overwritten.
+.sp
+The filesystem specified by \fIdevice\fP must not be mounted.
+.sp
+\fBNOTE:\fP
+.INDENT 0.0
+.INDENT 3.5
+Prior to overwriting the primary superblock, please make sure that the
+backup copies are valid!
+.UNINDENT
+.UNINDENT
+.sp
+To dump a superblock use the \fBbtrfs inspect\-internal dump\-super\fP command.
+.sp
+Then run the check (in the non\-repair mode) using the command \fBbtrfs check \-s\fP
+where \fI\-s\fP specifies the superblock copy to use.
+.sp
+Superblock copies exist in the following offsets on the device:
+.INDENT 0.0
+.IP \(bu 2
+primary: 64KiB (65536)
+.IP \(bu 2
+1st copy: 64MiB (67108864)
+.IP \(bu 2
+2nd copy: 256GiB (274877906944)
+.UNINDENT
+.sp
+A superblock size is 4KiB (4096).
+.SH OPTIONS
+.INDENT 0.0
+.TP
+.B \-s|\-\-super <N>
+use Nth superblock copy, valid values are 0 1 or 2 if the
+respective superblock offset is within the device size
+.UNINDENT
+.SH SEE ALSO
+.sp
+\fI\%btrfs(8)\fP
+.\" Generated by docutils manpage writer.
+.