Which lsattr / chattr can be reported for cifs/smb2/smb3 (and NTFS etc.)

[Steve French]

File Attributes:

WRITE_THROUGH  0x80000000 (which could map to FS_SYNC_FL)
and
NO_BUFFERING 0x20000000 (whoch could map to FS_DIRECTIO_FL)

are interesting, but ... they are defined in MS-CIFS, but no longer
seen in MS-FSCC so ... the obvious question is did they work on
Windows (and other NAS) for cifs but not for SMB2/SMB3?

Anyone ever tried to use these attribute flags?  Otherwise will ask the MS guys

On Wed, Sep 25, 2013 at 7:20 PM, Steve French <smfrench at gmail.com> wrote:
> Some of the attributes returnable by lsattr have equivalents in
> cifs/smb2/smb3 (and NTFS).  I just finished coding and testing (in
> cifs.ko) "setattr +c" (and lsattr) to enable marking a file as
> compressed over smb3.  David Disseldorp also has been testing patches
> for Samba server to support this (setting a flag as compressed) on
> btrfs.   In Windows, it is trivial (very easy for users) in the file
> manager to mark a file as compressed so it will be useful to support
> in Samba server.
>
> The obvious question to ask now is what other file or directory flags
> can we report in lsattr (and change in chattr) via smb3 (and
> presumably NTFS) besides whether the file is compressed.   Reporting
> that a file is immutable could presumably be done by reading the ACL
> and ensuring that no one has any of the write permissions.
> Similarly reporting that a file is append only may be equivalent to
> the case where a  files ACL has no write permissions except
> FILE_APPEND_DATA among all of the ACEs.
>
> Any thoughts on reporting FS_IMMUTABLE_FL or FS_APPEND_FL or ideas on
> how to report any of the other (except compression) flags over
> CIFS/SMB2/SMB3 (or in Linux NTFS file system).  Here is the complete
> list from fs.h
>
> /*
>  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
>  */
> #define FS_SECRM_FL 0x00000001 /* Secure deletion */
> #define FS_UNRM_FL 0x00000002 /* Undelete */
> #define FS_COMPR_FL 0x00000004 /* Compress file */
> #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
> #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
> #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
> #define FS_NODUMP_FL 0x00000040 /* do not dump file */
> #define FS_NOATIME_FL 0x00000080 /* do not update atime */
> /* Reserved for compression usage... */
> #define FS_DIRTY_FL 0x00000100
> #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
> #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
> #define FS_ECOMPR_FL 0x00000800 /* Compression error */
> /* End compression flags --- maybe not all used */
> #define FS_BTREE_FL 0x00001000 /* btree format dir */
> #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
> #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
> #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
> #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
> #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
> #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
> #define FS_EXTENT_FL 0x00080000 /* Extents */
> #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
> #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
> #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
>
> #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
> #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
>
> --
> Thanks,
>
> Steve



-- 
Thanks,

Steve