[PATCH 1/3] btrfs-progs: fix wrong data ratio for raid56 in btrfs-file-usage

[PATCH 1/3] btrfs-progs: fix wrong data ratio for raid56 in btrfs-file-usage

[Gui Hecheng]

When run btrfs-file-usage on a btrfs with data profile raid5/6,
the output message for "Free" & "Data to device ratio" seems wrong
as follows:
    ...
    Device size:		 100.00GiB
    Device allocated:		   2.04GiB
    Device unallocated:		  97.96GiB
    Used:			   1.12MiB
    Free (Estimated):		 197.89GiB <== Free > Device size
    Data to device ratio:	     198 % <== > 100%
    Global reserve:		     0.00B
    ...

It is because the function get_raid56_used() is not iterating the
chunk_info array correctly, it is just repeating adding the first
chunk_info statistics.
Just add a ptr to iterate over the array.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
---
 cmds-fi-disk_usage.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c
index 453410f..78dc414 100644
--- a/cmds-fi-disk_usage.c
+++ b/cmds-fi-disk_usage.c
@@ -293,14 +293,16 @@ static struct btrfs_ioctl_space_args *load_space_info(int fd, char *path)
 static void get_raid56_used(int fd, struct chunk_info *chunks, int chunkcount,
 		u64 *raid5_used, u64 *raid6_used)
 {
+	struct chunk_info *info_ptr = chunks;
 	*raid5_used = 0;
 	*raid6_used = 0;
 
 	while (chunkcount-- > 0) {
-		if (chunks->type & BTRFS_BLOCK_GROUP_RAID5)
-			(*raid5_used) += chunks->size / (chunks->num_stripes - 1);
-		if (chunks->type & BTRFS_BLOCK_GROUP_RAID6)
-			(*raid6_used) += chunks->size / (chunks->num_stripes - 2);
+		if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID5)
+			(*raid5_used) += info_ptr->size / (info_ptr->num_stripes - 1);
+		if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID6)
+			(*raid6_used) += info_ptr->size / (info_ptr->num_stripes - 2);
+		info_ptr++;
 	}
 }
 
-- 
1.8.1.4

[PATCH 2/3] btrfs-progs: output the correct path when fi-usage failed

[Gui Hecheng]

When we exec the following cmd:
	# btrfs file usage -t <path>  <-- an invalid path
output:
	# ERROR： can't access '-t'
should be:
	# ERROR: can't access 'path'

Just replace the static 'argv[1]' with 'argv[i]'.
---
 cmds-fi-disk_usage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c
index 78dc414..1f4c88e 100644
--- a/cmds-fi-disk_usage.c
+++ b/cmds-fi-disk_usage.c
@@ -835,7 +835,7 @@ int cmd_filesystem_usage(int argc, char **argv)
 		fd = open_file_or_dir(argv[i], &dirstream);
 		if (fd < 0) {
 			fprintf(stderr, "ERROR: can't access '%s'\n",
-				argv[1]);
+				argv[i]);
 			ret = 1;
 			goto out;
 		}
-- 
1.8.1.4

[PATCH 3/3] btrfs-progs: fix improper output msg for btrfs-fi-usage

[Gui Hecheng]

Even if run as root:
	# su
	# btrfs file usage <path> <== path exits outside the mnt point
We get the output:
	WARNING: ..., run as root
	WARNING: ..., run as root
	ERROR:...

It is because in load_chunk_info, the errno of ioctl is not judged
but rather the ret value of ioctl is judged. And the ret value of
ioctl is -1 which happens to match -EPERM exactly.
So the outer warning is printed.

Just judge the errno of ioctl and prevent the ret value of load_chunk_info
to be -1 in other error conditions.

For load_device_info, the problem and fix is the same.
After the fix, the 'run as root' WARNINGs will not show up in this condition.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
---
 cmds-fi-disk_usage.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c
index 1f4c88e..7c5c0cc 100644
--- a/cmds-fi-disk_usage.c
+++ b/cmds-fi-disk_usage.c
@@ -156,14 +156,14 @@ static int load_chunk_info(int fd, struct chunk_info **info_ptr, int *info_count
 	while (1) {
 		ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 		e = errno;
-		if (ret == -EPERM)
-			return ret;
+		if (e == EPERM)
+			return -e;
 
 		if (ret < 0) {
 			fprintf(stderr,
 				"ERROR: can't perform the search - %s\n",
 				strerror(e));
-			return ret;
+			return 1;
 		}
 		/* the ioctl returns the number of item it found in nr_items */
 
@@ -182,7 +182,7 @@ static int load_chunk_info(int fd, struct chunk_info **info_ptr, int *info_count
 			ret = add_info_to_list(info_ptr, info_count, item);
 			if (ret) {
 				*info_ptr = 0;
-				return ret;
+				return 1;
 			}
 
 			off += sh->len;
@@ -442,7 +442,7 @@ static int cmp_device_info(const void *a, const void *b)
 static int load_device_info(int fd, struct device_info **device_info_ptr,
 			   int *device_info_count)
 {
-	int ret, i, ndevs;
+	int ret, i, ndevs, e;
 	struct btrfs_ioctl_fs_info_args fi_args;
 	struct btrfs_ioctl_dev_info_args dev_info;
 	struct device_info *info;
@@ -451,17 +451,19 @@ static int load_device_info(int fd, struct device_info **device_info_ptr,
 	*device_info_ptr = 0;
 
 	ret = ioctl(fd, BTRFS_IOC_FS_INFO, &fi_args);
-	if (ret == -EPERM)
-		return ret;
+	e = errno;
+	if (e == EPERM)
+		return -e;
 	if (ret < 0) {
-		fprintf(stderr, "ERROR: cannot get filesystem info\n");
-		return ret;
+		fprintf(stderr, "ERROR: cannot get filesystem info - %s\n",
+				strerror(e));
+		return 1;
 	}
 
 	info = calloc(fi_args.num_devices, sizeof(struct device_info));
 	if (!info) {
 		fprintf(stderr, "ERROR: not enough memory\n");
-		return ret;
+		return 1;
 	}
 
 	for (i = 0, ndevs = 0 ; i <= fi_args.max_id ; i++) {
-- 
1.8.1.4

[PATCH v2 2/3] btrfs-progs: output the correct path when fi-usage failed

[Gui Hecheng]

When we exec the following cmd:
	# btrfs file usage -t <path>  <-- an invalid path
output:
	# ERROR： can't access '-t'
should be:
	# ERROR: can't access 'path'

Just replace the static 'argv[1]' with 'argv[i]'.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
---
changelog
	v1->v2: add missing signoff-by
---
 cmds-fi-disk_usage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c
index 78dc414..1f4c88e 100644
--- a/cmds-fi-disk_usage.c
+++ b/cmds-fi-disk_usage.c
@@ -835,7 +835,7 @@ int cmd_filesystem_usage(int argc, char **argv)
 		fd = open_file_or_dir(argv[i], &dirstream);
 		if (fd < 0) {
 			fprintf(stderr, "ERROR: can't access '%s'\n",
-				argv[1]);
+				argv[i]);
 			ret = 1;
 			goto out;
 		}
-- 
1.8.1.4