The btrfs filesystem resize command defaults to only resizing the
filesystem for devid 1, and must have a devid passed in to resize the
filesystem for the other devices in the filesystem.
Additionally the documentation lacked information on how to actually
resize the underlying partition so this provides a little more detail.
Signed-off-by: Shawn Bohrer <shawn.bohrer@xxxxxxxxx>
---
cmds-filesystem.c | 4 ++--
man/btrfs.8.in | 17 +++++++++++------
2 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index 1f53d1c..00e4310 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -456,10 +456,10 @@ static int cmd_defrag(int argc, char **argv)
}
static const char * const cmd_resize_usage[] = {
- "btrfs filesystem resize [+/-]<newsize>[gkm]|max <path>",
+ "btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
"Resize a filesystem",
"If 'max' is passed, the filesystem will occupy all available space",
- "on the device.",
+ "on the device 'devid'.",
NULL
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index be478e0..8066039 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -19,7 +19,7 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBfilesystem sync\fP\fI <path> \fP
.PP
-\fBbtrfs\fP \fBfilesystem resize\fP\fI [+/\-]<size>[gkm]|max <filesystem>\fP
+\fBbtrfs\fP \fBfilesystem resize\fP\fI [devid:][+/\-]<size>[gkm]|[devid:]max <filesystem>\fP
.PP
\fBbtrfs\fP \fBfilesystem label\fP\fI <dev> [newlabel]\fP
.PP
@@ -166,23 +166,28 @@ Force a sync for the filesystem identified by \fI<path>\fR.
.\" Some wording are extracted by the resize2fs man page
.\"
-\fBfilesystem resize\fR\fI [+/\-]<size>[gkm]|max <path>\fR
-Resize a filesystem identified by \fI<path>\fR.
+\fBfilesystem resize\fR\fI [devid:][+/\-]<size>[gkm]|[devid:]max <path>\fR
+Resize a filesystem identified by \fI<path>\fR for the underlying device
+\fIdevid\fR. The \fIdevid\fR can be found with \fBbtrfs filesystem show\fR and
+defaults to 1 if not specified.
The \fI<size>\fR parameter specifies the new size of the filesystem.
If the prefix \fI+\fR or \fI\-\fR is present the size is increased or decreased
by the quantity \fI<size>\fR.
If no units are specified, the unit of the \fI<size>\fR parameter defaults to
bytes. Optionally, the size parameter may be suffixed by one of the following
-the units designators: 'K', 'M', or 'G', kilobytes, megabytes, or gigabytes,
+the unit designators: 'K', 'M', or 'G', kilobytes, megabytes, or gigabytes,
respectively.
If 'max' is passed, the filesystem will occupy all available space on the
-volume(s).
+device \fIdevid\fR.
The \fBresize\fR command \fBdoes not\fR manipulate the size of underlying
partition. If you wish to enlarge/reduce a filesystem, you must make sure you
can expand the partition before enlarging the filesystem and shrink the
-partition after reducing the size of the filesystem.
+partition after reducing the size of the filesystem. This can done using
+\fBfdisk(8)\fR or \fBparted(8)\fR to delete the existing partition and recreate
+it with the new desired size. When recreating the partition make sure to use
+the same starting disk cylinder as before.
.TP
\fBbtrfs\fP \fBfilesystem label\fP\fI <dev> [newlabel]\fP
--
1.7.7.6
--
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