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btrfs-progs: inspect rootid: Allow a file to be specified

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Since cmd_inspect_rootid() calls btrfs_open_dir(), it rejects a file to
be specified. But as the document says, a file should be supported.

This patch introduces btrfs_open_file_or_dir(), which is a counterpart
of btrfs_open_dir(), to safely check and open btrfs file or directory.
The original btrfs_open_dir() content is moved to btrfs_open() and shared
by both function.

Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Misono, Tomohiro 2017-09-04 14:05:34 +09:00 committed by David Sterba
parent f47587d83d
commit 88ef0b8397
3 changed files with 16 additions and 4 deletions
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2
cmds-inspect.c
View File

@ -318,7 +318,7 @@ static int cmd_inspect_rootid(int argc, char **argv)
if (check_argc_exact(argc - optind, 1))
usage(cmd_inspect_rootid_usage);
fd = btrfs_open_dir(argv[optind], &dirstream, 1);
fd = btrfs_open_file_or_dir(argv[optind], &dirstream, 1);
if (fd < 0) {
ret = -ENOENT;
goto out;

16
utils.c
View File

@ -568,9 +568,9 @@ int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
/*
* Do the following checks before calling open_file_or_dir():
* 1: path is in a btrfs filesystem
* 2: path is a directory
* 2: path is a directory if dir_only is 1
*/
int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only)
{
struct statfs stfs;
struct stat st;
@ -593,7 +593,7 @@ int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
return -1;
}
if (!S_ISDIR(st.st_mode)) {
if (dir_only && !S_ISDIR(st.st_mode)) {
error_on(verbose, "not a directory: %s", path);
return -3;
}
@ -607,6 +607,16 @@ int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
return ret;
}
int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
{
return btrfs_open(path, dirstream, verbose, 1);
}
int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose)
{
return btrfs_open(path, dirstream, verbose, 0);
}
/* checks if a device is a loop device */
static int is_loop_device (const char* device) {
struct stat statbuf;

2
utils.h
View File

@ -108,7 +108,9 @@ int is_block_device(const char *file);
int is_mount_point(const char *file);
int check_arg_type(const char *input);
int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose);
int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only);
int btrfs_open_dir(const char *path, DIR **dirstream, int verbose);
int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose);
u64 btrfs_device_size(int fd, struct stat *st);
/* Helper to always get proper size of the destination string */
#define strncpy_null(dest, src) __strncpy_null(dest, src, sizeof(dest))