btrfs-progs: improve -D usage description

[Bruno Kleinert <fuddl@tauware.de>]

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Hi,

when trying out snapshot removal (yeah!) from the for-linus branch I
thought that the help message of btrfsctl could be a bit better. Also
the manpage of btrfsctl lacks information about it.

I attached two micro patches against btrfs-progs-unstable.

Cheers - Fuddl

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diff --git a/man/btrfsctl.8.in b/man/btrfsctl.8.in
index c2d4488..36391dc 100644
--- a/man/btrfsctl.8.in
+++ b/man/btrfsctl.8.in
@@ -10,6 +10,7 @@ btrfsctl \- control a btrfs filesystem
 [ \fB \-A\fP\fI device\fP ]
 [ \fB \-a\fP ]
 [ \fB \-c\fP ]
+[ \fB \-D\fP\fI snapshot-name directory\fP ]
 .SH DESCRIPTION
 .B btrfsctl
 is used to control the filesystem and the files and directories stored. It is the tool to create a new snapshot for the filesystem.
@@ -35,6 +36,9 @@ Scans all devices present in the system for btrfs filesystem.
 .TP
 \fB\-c\fR
 Forces a filesystem sync.
+.TP
+\fB\-D\fR \fIsnapshot-name directory\fR
+Deletes a \fIsnapshot\fP in the specified \fIdirectory\fP.
 .SH AVAILABILITY
 .B btrfsctl
 is part of btrfs-progs. Btrfs is currently under heavy development,

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diff --git a/btrfsctl.c b/btrfsctl.c
index 66c4e89..e37e2e3 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -46,7 +46,7 @@ static inline int ioctl(int fd, int define, void *arg) { return 0; }
 static void print_usage(void)
 {
 	printf("usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]\n");
-	printf("                [-r size] [-A device] [-a] [-c] [-D dir .]\n");
+	printf("                [-r size] [-A device] [-a] [-c] [-D snap_name dir]\n");
 	printf("\t-d filename: defragments one file\n");
 	printf("\t-d directory: defragments the entire Btree\n");
 	printf("\t-s snap_name dir: creates a new snapshot of dir\n");
@@ -55,7 +55,7 @@ static void print_usage(void)
 	printf("\t-A device: scans the device file for a Btrfs filesystem\n");
 	printf("\t-a: scans all devices for Btrfs filesystems\n");
 	printf("\t-c: forces a single FS sync\n");
-	printf("\t-D: delete snapshot\n");
+	printf("\t-D: snap_name dir: delete named snapshot in directory dir\n");
 	printf("%s\n", BTRFS_BUILD_VERSION);
 	exit(1);
 }

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