From: Anand Jain <anand.jain@xxxxxxxxxx>
This will add a sub command to show information about a subvol.
eg:
btrfs su show /btrfs/sssv3
/btrfs/sssv3
uuid: c5d646b5-a749-c646-b082-6d9a3ca870be
Parent uuid: 34bc8edd-113f-5141-a814-f6dfae069b01
Creation time: 2012-10-12 11:37:00
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
cmds-subvolume.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
man/btrfs.8.in | 6 +++
2 files changed, 119 insertions(+), 0 deletions(-)
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 92b69d1..13defa9 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -24,6 +24,7 @@
#include <libgen.h>
#include <limits.h>
#include <getopt.h>
+#include <uuid/uuid.h>
#include "kerncompat.h"
#include "ioctl.h"
@@ -703,6 +704,117 @@ static int cmd_find_new(int argc, char **argv)
return 0;
}
+static const char * const cmd_subvol_show_usage[] = {
+ "btrfs subvolume show <subvol-path>",
+ "Show information about the given subvolume",
+ NULL
+};
+
+static int cmd_subvol_show(int argc, char **argv)
+{
+ int ret, fd;
+ char *subvol, *mnt = NULL;
+ struct root_info get_ri;
+ char tstr[256];
+ char uuidparse[37];
+
+ if (check_argc_exact(argc, 2))
+ usage(cmd_subvol_show_usage);
+
+ subvol = argv[1];
+
+ ret = test_issubvolume(subvol);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
+ return 12;
+ }
+ if (!ret) {
+ fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
+ return 13;
+ }
+
+ ret = find_mount_root(subvol, &mnt);
+ if (ret < 0) {
+ fprintf(stderr, "ERROR: find_mount_root failed on %s: "
+ "%s\n", subvol, strerror(-ret));
+ return 12;
+ }
+ if (!strcmp(subvol, mnt))
+ return 0;
+
+ /* +1 will point after the "/" */
+ get_ri.full_path = subvol+strlen(mnt)+1;
+
+ if (!strcmp(get_ri.full_path, ""))
+ return 0;
+
+ fd = open_file_or_dir(mnt);
+ if (fd < 0) {
+ fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
+ return 12;
+ }
+
+ if (btrfs_get_a_subvol(fd, &get_ri)) {
+ fprintf(stderr, "ERROR: can't find '%s'\n",
+ get_ri.full_path);
+ close(fd);
+ return 13;
+ }
+
+ /* print the info */
+ printf("%s/%s", mnt, get_ri.full_path);
+ printf("\n");
+ if (uuid_is_null(get_ri.uuid))
+ strcpy(uuidparse, "-");
+ else
+ uuid_unparse(get_ri.uuid, uuidparse);
+ printf("\t");
+ printf("uuid: \t\t%s", uuidparse);
+ printf("\n");
+ if (uuid_is_null(get_ri.puuid))
+ strcpy(uuidparse, "-");
+ else
+ uuid_unparse(get_ri.puuid, uuidparse);
+ printf("\t");
+ printf("Parent uuid: \t%s", uuidparse);
+ printf("\n");
+ if (get_ri.otime)
+ strftime(tstr, 256, "%Y-%m-%d %X",
+ localtime(&get_ri.otime));
+ else
+ strcpy(tstr, "-");
+ printf("\t");
+ printf("Creation time: \t%s", tstr);
+ printf("\n");
+
+/* if in case we decide to have more available data
+ to be shown we can use it as below.
+
+ printf("Object ID: %llu", get_ri.root_id);
+ printf("\n");
+ printf("Generation: %llu", get_ri.gen);
+ printf("\n");
+ printf("OGeneration: %llu", get_ri.ogen);
+ printf("\n");
+ printf("Parent: %llu", get_ri.ref_tree);
+ printf("\n");
+ printf("Top Level: %llu", get_ri.top_id);
+ printf("\n");
+*/
+
+ /* clean up */
+ if (get_ri.path)
+ free(get_ri.path);
+ if (get_ri.name)
+ free(get_ri.name);
+ if (get_ri.full_path)
+ free(get_ri.full_path);
+
+ close(fd);
+ free(mnt);
+ return 0;
+}
+
const struct cmd_group subvolume_cmd_group = {
subvolume_cmd_group_usage, NULL, {
{ "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
@@ -714,6 +826,7 @@ const struct cmd_group subvolume_cmd_group = {
{ "set-default", cmd_subvol_set_default,
cmd_subvol_set_default_usage, NULL, 0 },
{ "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
+ { "show", cmd_subvol_show, cmd_subvol_show_usage, NULL, 0 },
{ 0, 0, 0, 0, 0 }
}
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 9222580..57c25b0 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -17,6 +17,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBsubvolume get-default\fP\fI <path>\fP
.PP
+\fBbtrfs\fP \fBsubvolume show\fP\fI <path>\fP
+.PP
\fBbtrfs\fP \fBfilesystem defragment\fP -c[zlib|lzo] [-l \fIlen\fR] \
[-s \fIstart\fR] [-t \fIsize\fR] -[vf] <\fIfile\fR>|<\fIdir\fR> \
[<\fIfile\fR>|<\fIdir\fR>...]
@@ -160,6 +162,10 @@ Get the default subvolume of the filesystem \fI<path>\fR. The output format
is similar to \fBsubvolume list\fR command.
.TP
+\fBsubvolume show\fR\fI <path>\fR
+Show information of a given subvolume in the \fI<path>\fR.
+.TP
+
\fBfilesystem defragment\fP -c[zlib|lzo] [-l \fIlen\fR] [-s \fIstart\fR] \
[-t \fIsize\fR] -[vf] <\fIfile\fR>|<\fIdir\fR> [<\fIfile\fR>|<\fIdir\fR>...]
--
1.7.1
--
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