mountpoint-util: add new helper name_to_handle_at_try_fid()

Newer kernels support a new flag for name_to_handle_at(): AT_HANDLE_FID.
This flag is supposed to return an identifier for an inode that we can
use for checking inode identity. It's supposed to be a replacement for
checking .st_ino which doesn't work anymore today because inode numbers
are no longer unique on file systems (not on overlayfs, and not on btrfs
for example). Hence, be a good citizen and add infrastructure to support
AT_HANDLE_FID. Unfortunately that doesn't work for old kernels, hence
add a fallback logic: if we can use the flag, use it. If we cannot use
name_to_handle_at() without it, which might give us a good ID too. But
of course tha tcan fail as well, which callers have to check.

This commit is contained in:

Lennart Poettering

2024-07-01 15:45:15 +02:00

parent 6fba9a28b9

commit 81995fbb96

3 changed files with 32 additions and 1 deletions

									
										src/basic/missing_fcntl.h
									
		+4
		
												View File
												
				@@ -92,3 +92,7 @@

				#define RAW_O_LARGEFILE 00100000

				#endif

				#endif

				#ifndef AT_HANDLE_FID

				#define AT_HANDLE_FID AT_REMOVEDIR

				#endif