From c7b5293d8d7e3cd5c883a11f979c391fdb45230b Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Thu, 24 Apr 2014 18:32:27 +0200
Subject: [PATCH] btrfs-progs: Print more info about device sizes

The entire device size may not be available to the filesystem, eg. if
it's modified via resize. Print this information if it can be obtained
from the DEV_INFO ioctl.

Print the device ID on the same line as the device name and move size to
the next line.

Sample:
/dev/sda7, ID: 3
   Device size:            10.00GiB
   FS occupied:             5.00GiB
   Data,RAID10:           512.00MiB
   Metadata,RAID10:       512.00MiB
   System,RAID10:           4.00MiB
   Unallocated:             9.00GiB

Signed-off-by: David Sterba <dsterba@suse.cz>
---
 cmds-device.c        |  6 +++---
 cmds-fi-disk_usage.c | 14 ++++++++++++--
 cmds-fi-disk_usage.h |  6 +++++-
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/cmds-device.c b/cmds-device.c
index 2fe33eb2..546db6de 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -474,9 +474,9 @@ static int _cmd_device_usage(int fd, char *path, int mode)
 	}
 
 	for (i = 0; i < device_info_count; i++) {
-		printf("%s\t%10s\n", device_info_ptr[i].path,
-			df_pretty_sizes(device_info_ptr[i].size, mode));
-
+		printf("%s, ID: %llu\n", device_info_ptr[i].path,
+				device_info_ptr[i].devid);
+		print_device_sizes(fd, &device_info_ptr[i], mode);
 		print_device_chunks(fd, device_info_ptr[i].devid,
 				device_info_ptr[i].size,
 				info_ptr, info_count,
diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c
index f984be83..83a3c6d5 100644
--- a/cmds-fi-disk_usage.c
+++ b/cmds-fi-disk_usage.c
@@ -499,7 +499,8 @@ int load_device_info(int fd, struct device_info **device_info_ptr,
 
 		info[ndevs].devid = dev_info.devid;
 		strcpy(info[ndevs].path, (char *)dev_info.path);
-		info[ndevs].size = get_partition_size((char *)dev_info.path);
+		info[ndevs].device_size = get_partition_size((char *)dev_info.path);
+		info[ndevs].size = dev_info.total_bytes;
 		++ndevs;
 	}
 
@@ -879,5 +880,14 @@ void print_device_chunks(int fd, u64 devid, u64 total_size,
 	printf("   Unallocated: %*s%10s\n",
 		(int)(20 - strlen("Unallocated")), "",
 		df_pretty_sizes(total_size - allocated, mode));
-
+}
+
+void print_device_sizes(int fd, struct device_info *devinfo, int mode)
+{
+	printf("   Device size: %*s%10s\n",
+		(int)(20 - strlen("Device size")), "",
+		df_pretty_sizes(devinfo->device_size, mode));
+	printf("   FS occupied: %*s%10s\n",
+		(int)(20 - strlen("FS occupied")), "",
+		df_pretty_sizes(devinfo->size, mode));
 }
diff --git a/cmds-fi-disk_usage.h b/cmds-fi-disk_usage.h
index 787b4eb5..79cc2a11 100644
--- a/cmds-fi-disk_usage.h
+++ b/cmds-fi-disk_usage.h
@@ -27,7 +27,10 @@ int cmd_filesystem_usage(int argc, char **argv);
 struct device_info {
 	u64	devid;
 	char	path[BTRFS_DEVICE_PATH_NAME_MAX];
-	u64	size;
+	/* Size of the block device */
+	u64	device_size;
+	/* Size that's occupied by the filesystem, can be changed via resize */
+	u64     size;
 };
 
 /*
@@ -50,5 +53,6 @@ char *df_pretty_sizes(u64 size, int mode);
 void print_device_chunks(int fd, u64 devid, u64 total_size,
 		struct chunk_info *chunks_info_ptr,
 		int chunks_info_count, int mode);
+void print_device_sizes(int fd, struct device_info *devinfo, int mode);
 
 #endif