On 2010-07-01, at 17:57, David Howells wrote: > [This is, for the moment, to be considered an example. Do we actually want to > export these flags? Should they be a full member of struct xstat?] I would say this should be a full-fledged member of struct xstat. I think they are fairly standard (available on many filesystems today), and requiring an ioctl to access them is unpleasant. > (1) User settable flags (to be consistent with the BSD st_flags field): > > UF_NODUMP Do not dump this file. > UF_IMMUTABLE This file is immutable. > UF_APPEND This file is append-only. > UF_OPAQUE This directory is opaque (unionfs). > UF_NOUNLINK This file can't be removed or renamed. > UF_COMPRESSED This file is compressed. > UF_HIDDEN This file shouldn't be displayed in a GUI. > > The UF_SETTABLE constant is the union of the above flags. > > (2) Superuser settable flags (to be consistent with the BSD st_flags field): > > SF_ARCHIVED This file has been archived. > SF_IMMUTABLE This file is immutable. > SF_APPEND This file is append-only. > SF_NOUNLINK This file can't be removed or renamed. > SF_HIDDEN This file is a snapshot inode. > > The SF_SETTABLE constant is the union of the above flags. > > (3) Linux-specific flags: > > XSTAT_LF_MAGIC_FILE Magic file, such as found in procfs and sysfs. > XSTAT_LF_SYNC File is written synchronously. > XSTAT_LF_NOATIME Atime is not updated on this file. > XSTAT_LF_JOURNALLED_DATA Data modifications to this file are journalled. > XSTAT_LF_ENCRYPTED This file is encrypted. > XSTAT_LF_SYSTEM This file is a system file (FAT/NTFS/CIFS). > XSTAT_LF_TEMPORARY This file is a temporary file (NTFS/CIFS). > XSTAT_LF_OFFLINE file is currently unavailable (CIFS). Yuck on the names. Why not stick with the "UF_" and "SF_" prefixes? Since we don't need to keep _binary_ compatibility with these flag values (only name portability) we can use the same flag values as the FS_*_FL definitions in fs.h. That is what all of the existing filesystems already use (ext2/3/4, ocfs, btrfs, reiserfs, xfs, jfs). Cheers, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
