@@ -37,6 +37,7 @@
#include "version.h"
#include "commands.h"
#include "list_sort.h"
+#include "disk-io.h"
static const char * const filesystem_cmd_group_usage[] = {
"btrfs filesystem [<group>] <command> [<args>]",
@@ -416,6 +417,39 @@ static int btrfs_scan_kernel(void *search)
return 0;
}
+static int dev_to_fsid(char *dev, __u8 *fsid)
+{
+ struct btrfs_super_block *disk_super;
+ char *buf;
+ int ret;
+ int fd;
+
+ buf = malloc(4096);
+ if (!buf)
+ return -ENOMEM;
+
+ fd = open(dev, O_RDONLY);
+ if (fd < 0) {
+ ret = -errno;
+ free(buf);
+ return ret;
+ }
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(fd, disk_super,
+ BTRFS_SUPER_INFO_OFFSET);
+ if (ret)
+ goto out;
+
+ memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+ ret = 0;
+
+out:
+ close(fd);
+ free(buf);
+ return ret;
+}
+
static const char * const cmd_show_usage[] = {
"btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
"Show the structure of a filesystem",
@@ -436,6 +470,8 @@ static int cmd_show(int argc, char **argv)
int type = 0;
char mp[BTRFS_PATH_NAME_MAX + 1];
char path[PATH_MAX];
+ __u8 fsid[BTRFS_FSID_SIZE];
+ char uuid_buf[37];
while (1) {
int long_index;
@@ -468,6 +504,11 @@ static int cmd_show(int argc, char **argv)
if (strlen(search) == 0)
usage(cmd_show_usage);
type = check_arg_type(search);
+ /*
+ * needs spl handling if input arg is block dev
+ * And if input arg is mount-point just print it
+ * right away
+ */
if (type == BTRFS_ARG_BLKDEV) {
if (where == BTRFS_SCAN_DEV) {
/* we need to do this because
@@ -479,11 +520,23 @@ static int cmd_show(int argc, char **argv)
} else {
ret = get_btrfs_mount(search,
mp, sizeof(mp));
- if (!ret)
+ if (!ret) {
/* given block dev is mounted*/
search = mp;
- else
+ type = BTRFS_ARG_MNTPOINT;
+ } else {
+ ret = dev_to_fsid(search, fsid);
+ if (ret) {
+ fprintf(stderr,
+ "ERROR: No btrfs on %s\n",
+ search);
+ return 1;
+ }
+ uuid_unparse(fsid, uuid_buf);
+ search = uuid_buf;
+ type = BTRFS_ARG_UUID;
goto devs_only;
+ }
}
} else if (type == BTRFS_ARG_MNTPOINT) {
char label[BTRFS_LABEL_SIZE];
A new test case when disk is unmounted and if the non mapper disk path is given as the argument to the btrfs filesystem show <arg> we still need this to work but lblkid will pull only mapper disks, it won't match. So this will normalize the input to find btrfs by fsid and pass it to the search. Signed-off-by: Anand Jain <anand.jain@oracle.com> --- v4: rebased on integration-20131114 v3: accepts Josef suggested again v2: accepts Josef suggested cmds-filesystem.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 55 insertions(+), 2 deletions(-)