From a6979c52fbff0e0961a0a0546c45bca11f6a0658 Mon Sep 17 00:00:00 2001 From: David Sterba Date: Thu, 24 Apr 2014 15:21:16 +0200 Subject: [PATCH 32/42] 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 --- cmds-fi-disk_usage.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/cmds-fi-disk_usage.c b/cmds-fi-disk_usage.c index 023659daac0e..3fa2af004dc4 100644 --- a/cmds-fi-disk_usage.c +++ b/cmds-fi-disk_usage.c @@ -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; -- 1.9.0