btrfs-progs: fix improper output msg for btrfs-fi-usage

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>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Gui Hecheng 2014-07-24 11:21:54 +08:00 committed by David Sterba
parent b11c8d639e
commit 4dc414fcfb

View File

@ -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++) {