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+.TH "BTRFSTUNE" "8" "Feb 14, 2024" "6.7.1" "BTRFS"
+.SH NAME
+btrfstune \- tune various filesystem parameters
+.SH SYNOPSIS
+.sp
+\fBbtrfstune\fP [options] <device> [<device>...]
+.SH DESCRIPTION
+.sp
+\fBbtrfstune\fP can be used to enable, disable, or set various filesystem
+parameters. The filesystem must be unmounted.
+.sp
+The common use case is to enable features that were not enabled at mkfs time.
+Please make sure that you have kernel support for the features.  You can find a
+complete list of features and kernel version of their introduction at
+\fI\%Feature by version\fP page.  Also, the manual page
+\fI\%mkfs.btrfs(8)\fP contains more details about the features.
+.sp
+Some of the features could be also enabled on a mounted filesystem by other
+means.  Please refer to the \fIFILESYSTEM FEATURES\fP in \fI\%btrfs(5)\fP\&.
+.SH OPTIONS
+.INDENT 0.0
+.TP
+.B  \-\-convert\-to\-block\-group\-tree
+(since kernel 6.1)
+.sp
+Convert portions of extent tree that tracks block groups to a separate
+block group tree. This greatly reduces mount time. Can be also enabled
+at mkfs time.
+.TP
+.B  \-\-convert\-from\-block\-group\-tree
+(since kernel 6.1)
+.sp
+Convert block groups tracked in standalone block group tree back to
+extent tree and remove \fIblock\-group\-tree\fP feature bit from the filesystem.
+.TP
+.B  \-\-convert\-to\-free\-space\-tree
+(since kernel 4.5)
+.sp
+Convert to free\-space\-tree feature (v2 of space cache).
+.TP
+.B  \-f
+Allow dangerous changes, e.g. clear the seeding flag or change fsid.
+Make sure that you are aware of the dangers.
+.TP
+.B  \-m
+(since kernel: 5.0)
+.sp
+change fsid stored as \fImetadata_uuid\fP to a randomly generated UUID,
+see also \fI\-U\fP
+.UNINDENT
+.INDENT 0.0
+.TP
+.BI \-M \ <UUID>
+(since kernel: 5.0)
+.sp
+change fsid stored as \fImetadata_uuid\fP to a given UUID, see also \fI\-U\fP
+.sp
+The metadata_uuid is stored only in the superblock and is a backward
+incompatible change. The fsid in metadata blocks remains unchanged and
+is not overwritten, thus the whole operation is significantly faster
+than \fI\-U\fP\&.
+.sp
+The new metadata_uuid can be used for mount by UUID and is also used to
+identify devices of a multi\-device filesystem.
+.TP
+.B  \-n
+(since kernel: 3.14)
+.sp
+Enable no\-holes feature (more efficient representation of file holes),
+enabled by mkfs feature \fIno\-holes\fP\&.
+.TP
+.B  \-r
+(since kernel: 3.7)
+.sp
+Enable extended inode refs (hardlink limit per file in a directory is
+65536), enabled by mkfs feature \fIextref\fP\&.
+.TP
+.BI \-S \ <0|1>
+Enable seeding on a given device. Value 1 will enable seeding, 0 will
+disable it.  A seeding filesystem is forced to be mounted read\-only. A
+new device can be added to the filesystem and will capture all writes
+keeping the seeding device intact.  See also section
+\fI\%SEEDING DEVICE\fP
+in \fI\%btrfs(5)\fP\&.
+.sp
+\fBWARNING:\fP
+.INDENT 7.0
+.INDENT 3.5
+Clearing the seeding flag on a device may be dangerous.  If a
+previously\-seeding device is changed, all filesystems that used
+that device will become unmountable. Setting the seeding flag
+back will not fix that.
+.sp
+A valid usecase is \fIseeding device as a base image\fP\&. Clear the
+seeding flag, update the filesystem and make it seeding again,
+provided that it\(aqs OK to throw away all filesystems built on
+top of the previous base.
+.UNINDENT
+.UNINDENT
+.TP
+.B  \-u
+Change fsid to a randomly generated UUID or continue previous fsid
+change operation in case it was interrupted.
+.TP
+.BI \-U \ <UUID>
+Change fsid to \fIUUID\fP in all metadata blocks.
+.sp
+The \fIUUID\fP should be a 36 bytes string in \fBprintf(3)\fP format
+\fB%08x\-%04x\-%04x\-%04x\-%012x\fP\&.
+If there is a previous unfinished fsid change, it will continue only if the
+\fIUUID\fP matches the unfinished one or if you use the option \fI\-u\fP\&.
+.sp
+All metadata blocks are rewritten, this may take some time, but the final
+filesystem compatibility is unaffected, unlike \fI\-M\fP\&.
+.sp
+\fBWARNING:\fP
+.INDENT 7.0
+.INDENT 3.5
+Cancelling or interrupting a UUID change operation will make
+the filesystem temporarily unmountable.  To fix it, rerun
+\fBbtrfstune \-u\fP and let it complete.
+.UNINDENT
+.UNINDENT
+.TP
+.B  \-x
+(since kernel: 3.10)
+.sp
+Enable skinny metadata extent refs (more efficient representation of
+extents), enabled by mkfs feature \fIskinny\-metadata\fP\&.
+.sp
+All newly created extents will use the new representation. To
+completely switch the entire filesystem, run a full balance of the
+metadata. Please refer to \fI\%btrfs\-balance(8)\fP\&.
+.UNINDENT
+.SH EXIT STATUS
+.sp
+\fBbtrfstune\fP returns 0 if no error happened, 1 otherwise.
+.SH COMPATIBILITY NOTE
+.sp
+This deprecated tool exists for historical reasons but is still in use today.
+Its functionality will be merged to the main tool, at which time \fBbtrfstune\fP
+will be declared obsolete and scheduled for removal.
+.SH SEE ALSO
+.sp
+\fI\%btrfs(5)\fP,
+\fI\%btrfs\-balance(8)\fP,
+\fI\%mkfs.btrfs(8)\fP
+.\" Generated by docutils manpage writer.
+.