btrfs-progs: fi: move dev_to_fsid to cmds-fi-usage for later use

[platform/upstream/btrfs-progs.git] / cmds-fi-usage.c

diff --git a/cmds-fi-usage.c b/cmds-fi-usage.c
index 394de0c..a72fb4e 100644 (file)
--- 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"
@@ -29,8 +30,10 @@
 #include "string-table.h"
 #include "cmds-fi-usage.h"
 #include "commands.h"
+#include "disk-io.h"
 
 #include "version.h"
+#include "help.h"
 
 /*
  * Add the chunk info to the chunk_info list
@@ -285,7 +288,7 @@ static struct btrfs_ioctl_space_args *load_space_info(int fd, char *path)
  * which compose the chunk, which could be different from the number of devices
  * if a disk is added later.
  */
-static void get_raid56_used(int fd, struct chunk_info *chunks, int chunkcount,
+static void get_raid56_used(struct chunk_info *chunks, int chunkcount,
                u64 *raid5_used, u64 *raid6_used)
 {
        struct chunk_info *info_ptr = chunks;
@@ -359,7 +362,7 @@ static int print_filesystem_usage_overall(int fd, struct chunk_info *chunkinfo,
                ret = 1;
                goto exit;
        }
-       get_raid56_used(fd, chunkinfo, chunkcount, &raid5_used, &raid6_used);
+       get_raid56_used(chunkinfo, chunkcount, &raid5_used, &raid6_used);
 
        for (i = 0; i < sargs->total_spaces; i++) {
                int ratio;
@@ -505,6 +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
  */
@@ -996,7 +1026,7 @@ out:
        return !!ret;
 }
 
-void print_device_chunks(int fd, struct device_info *devinfo,
+void print_device_chunks(struct device_info *devinfo,
                struct chunk_info *chunks_info_ptr,
                int chunks_info_count, unsigned unit_mode)
 {
@@ -1032,13 +1062,14 @@ void print_device_chunks(int fd, struct device_info *devinfo,
                        unit_mode | UNITS_NEGATIVE));
 }
 
-void print_device_sizes(int fd, struct device_info *devinfo, unsigned unit_mode)
+void print_device_sizes(struct device_info *devinfo, unsigned unit_mode)
 {
        printf("   Device size: %*s%10s\n",
                (int)(20 - strlen("Device size")), "",
                pretty_size_mode(devinfo->device_size, unit_mode));
        printf("   Device slack: %*s%10s\n",
                (int)(20 - strlen("Device slack")), "",
-               pretty_size_mode(devinfo->device_size - devinfo->size,
+               pretty_size_mode(devinfo->device_size > 0 ?
+                       devinfo->device_size - devinfo->size : 0,
                        unit_mode));
 }