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SubjectRe: [PATCH 09/18] xstat: Make special system filesystems return FS_SPECIAL_FL [ver #6]
Date
Christoph Hellwig <hch@infradead.org> wrote:

> special is not a very useful identifier. Also what you are returning
> is per-filesystem data, not per-file. This needs to go into statfs,
> not into stat. We're about to introduce flags for statfs, so try
> to do it ontop of those.
>
> The same thing applies to the remote flag in the next patch.

Which means that you have to do two calls (xstat+statfs) to find this
information that we can return pretty much for free here, though you can cache
it based on st_dev, I suppose.

Also, not all the flags are per-filesystem. The following are:

FS_SPECIAL_FL /* Special file as found in procfs/sysfs */
FS_REMOTE_FL /* File is remote */

but the rest aren't:

FS_AUTOMOUNT_FL /* Specific automount point */
FS_AUTOMOUNT_ANY_FL /* Unspecific automount directory */
FS_ENCRYPTED_FL /* File is encrypted */
FS_HIDDEN_FL /* File is marked hidden (DOS+) */
FS_SYSTEM_FL /* File is marked system (DOS+) */
FS_ARCHIVE_FL /* File is marked archive (DOS+) */
FS_TEMPORARY_FL /* File is temporary (NTFS/CIFS) */
FS_OFFLINE_FL /* File is offline (CIFS) */
FS_REPARSE_POINT_FL /* Reparse point (NTFS/CIFS) */

David


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