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@xxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
