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btrfs-progs: fix improper return value check for is_existing_blk_or_reg_file 

The function @is_existing_blk_or_reg_file has a return value of -errno,
which indicate the @stat call fails with non-ENOENT errors.
In this condition, we should not continue the following work.

But -errno evaluates to true and will let the following work go.
So we should judge more accurately whether the return value of
@is_existing_blk_or_reg_file is > 0 or not to decide our behavior.

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 2014-07-31 11:23:44 +08:00 committed by David Sterba
parent 508e9ac827
commit eb39e765f1
1 changed files with 13 additions and 6 deletions
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19
utils.c
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@ -1563,22 +1563,29 @@ int get_label(const char *btrfs_dev, char *label)
{
int ret;
if (is_existing_blk_or_reg_file(btrfs_dev))
ret = get_label_unmounted(btrfs_dev, label);
else
ret = is_existing_blk_or_reg_file(btrfs_dev);
if (!ret)
ret = get_label_mounted(btrfs_dev, label);
else if (ret > 0)
ret = get_label_unmounted(btrfs_dev, label);
return ret;
}
int set_label(const char *btrfs_dev, const char *label)
{
int ret;
if (check_label(label))
return -1;
return is_existing_blk_or_reg_file(btrfs_dev) ?
set_label_unmounted(btrfs_dev, label) :
set_label_mounted(btrfs_dev, label);
ret = is_existing_blk_or_reg_file(btrfs_dev);
if (!ret)
ret = set_label_mounted(btrfs_dev, label);
else if (ret > 0)
ret = set_label_unmounted(btrfs_dev, label);
return ret;
}
int btrfs_scan_block_devices(int run_ioctl)