[PATCH 03/12] statx: Add a system call to make enhanced file info available

Dave Chinner david at fromorbit.com
Tue Nov 24 20:21:13 UTC 2015

On Fri, Nov 20, 2015 at 02:54:57PM +0000, David Howells wrote:
> The defined bits in st_ioc_flags are the usual FS_xxx_FL, plus some extra
> flags that might be supplied by the filesystem.  Note that Ext4 returns
> flags outside of {EXT4,FS}_FL_USER_VISIBLE in response to FS_IOC_GETFLAGS.
> Should {EXT4,FS}_FL_USER_VISIBLE be extended to cover them?  Or should the
> extra flags be suppressed?

Quite frankly, we should not expose flags owned by a filesystem like
this. Create a new set of flagsi that are exposed by the syscall,
and every filesystem is responsible for translating their internal
flag values to the syscall flag values....

> The defined bits in the st_information field give local system data on a
> file, how it is accessed, where it is and what it does:
> 	STATX_INFO_ENCRYPTED		File is encrypted
> 	STATX_INFO_TEMPORARY		File is temporary (NTFS/CIFS/deleted)
> 	STATX_INFO_FABRICATED		File was made up by filesystem
> 	STATX_INFO_KERNEL_API		File is kernel API (eg: procfs/sysfs)
> 	STATX_INFO_REMOTE		File is remote
> 	STATX_INFO_OFFLINE		File is offline (CIFS)
> 	STATX_INFO_AUTOMOUNT		Dir is automount trigger
> 	STATX_INFO_AUTODIR		Dir provides unlisted automounts
> 	STATX_INFO_NONSYSTEM_OWNERSHIP	File has non-system ownership details
> 	STATX_INFO_REPARSE_POINT	File is reparse point (NTFS/CIFS)

	STATX_INFO_XATTR		File/dir has extended attrs

... just like these STATX_INFO flags are filesystem independent...

And, FWIW, I'd like to see more than one local filesystem supported
in the initial patchset (e.g. btrfs) and also have all their
inode/fs flags exposed so we don't end up encoding weird
ext4-specific feature quirks into the API.....


Dave Chinner
david at fromorbit.com

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