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btrfs-progs: check if we can't get info from ioctls due to permissions 

The TREE_SEARCH ioctl is root-only, FS_INFO will be available for
non-root users with an updated kernel, let the user know.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2014-04-24 15:21:16 +02:00
parent f4e73c060d
commit 6e4d756dee
1 changed files with 10 additions and 0 deletions
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10
cmds-fi-disk_usage.c
View File

@ -172,6 +172,12 @@ 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) {
fprintf(stderr,
"ERROR: can't read detailed chunk info from ioctl(TREE_SEARCH), run as root\n");
return 0;
}
if (ret < 0) {
fprintf(stderr,
"ERROR: can't perform the search - %s\n",
@ -461,6 +467,10 @@ 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) {
fprintf(stderr, "ERROR: can't get filesystem info from ioctl(FS_INFO), run as root\n");
return -1;
}
if (ret < 0) {
fprintf(stderr, "ERROR: cannot get filesystem info\n");
return -1;