diff options
Diffstat (limited to 'cmds-fi-usage.c')
| -rw-r--r-- | cmds-fi-usage.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/cmds-fi-usage.c b/cmds-fi-usage.c index 6c846c15..a72fb4e3 100644 --- a/cmds-fi-usage.c +++ b/cmds-fi-usage.c @@ -22,6 +22,7 @@ #include <errno.h> #include <stdarg.h> #include <getopt.h> +#include <fcntl.h> #include "utils.h" #include "kerncompat.h" @@ -29,6 +30,7 @@ #include "string-table.h" #include "cmds-fi-usage.h" #include "commands.h" +#include "disk-io.h" #include "version.h" #include "help.h" @@ -506,6 +508,33 @@ static int cmp_device_info(const void *a, const void *b) ((struct device_info *)b)->path); } +int dev_to_fsid(const char *dev, __u8 *fsid) +{ + struct btrfs_super_block *disk_super; + char buf[BTRFS_SUPER_INFO_SIZE]; + int ret; + int fd; + + fd = open(dev, O_RDONLY); + if (fd < 0) { + ret = -errno; + return ret; + } + + disk_super = (struct btrfs_super_block *)buf; + ret = btrfs_read_dev_super(fd, disk_super, + BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT); + if (ret) + goto out; + + memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE); + ret = 0; + +out: + close(fd); + return ret; +} + /* * This function loads the device_info structure and put them in an array */ |