JFS: ext2 inode attributes for jfs
ext2 inode attributes with relevance for jfs:
'a' EXT2_APPEND_FL -> append only
'i' EXT2_IMMUTABLE_FL -> immutable file
's' EXT2_SECRM_FL -> zero file
'u' EXT2_UNRM_FL -> allow for unrm
'A' EXT2_NOATIME_FL -> no access time
'D' EXT2_DIRSYNC_FL -> dirsync
'S' EXT2_SYNC_FL -> sync
overview of jfs flags (partially for OS/2)
value (OS/2) Linux ext2 attrs
------------------------------------------------
0x00010000 IFJOURNAL -
0x00020000 ISPARSE used
0x00040000 INLINEEA used
0x00080000 - - JFS_NOATIME_FL
0x00100000 - - JFS_DIRSYNC_FL
0x00200000 - - JFS_SYNC_FL
0x00400000 - - JFS_SECRM_FL
0x00800000 ISWAPFILE - JFS_UNRM_FL
0x01000000 - - JFS_APPEND_FL
0x02000000 IREADONLY - JFS_IMMUTABLE_FL
0x04000000 IHIDDEN - -
0x08000000 ISYSTEM - -
0x10000000 - -
0x20000000 IDIRECTORY used
0x40000000 IARCHIVE -
0x80000000 INEWNAME -
the implementation is straight forward, except
for the fact that the attributes have to be mapped
to match with the ext2 ones to avoid a separate
tool for manipulating them (this could be avoided
when using a separate flag field in the on-disk
representation, but the overhead is minimal)
a special jfs_ioctl is added to allow for the new
JFS_IOC_GETFLAGS and JFS_IOC_SETFLAGS calls.
a helper function jfs_set_inode_flags() to transfer
the flags from the on-disk version to the inode
minor changes to allow flag inheritance on inode
creation, as well as a cleanup of the on-disk
flags (including the new ones)
beforementioned helper to map between ext2 and jfs
versions of the new flags ...
the JFS_SECRM_FL and JFS_UNRM_FL are not done yet
and I'm not 100% sure they are worth the effort,
the rest seems to work out of the box ...
Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
diff --git a/fs/jfs/jfs_dinode.h b/fs/jfs/jfs_dinode.h
index 580a325..9f2572a 100644
--- a/fs/jfs/jfs_dinode.h
+++ b/fs/jfs/jfs_dinode.h
@@ -139,13 +139,36 @@
/* more extended mode bits: attributes for OS/2 */
#define IREADONLY 0x02000000 /* no write access to file */
-#define IARCHIVE 0x40000000 /* file archive bit */
-#define ISYSTEM 0x08000000 /* system file */
#define IHIDDEN 0x04000000 /* hidden file */
-#define IRASH 0x4E000000 /* mask for changeable attributes */
-#define INEWNAME 0x80000000 /* non-8.3 filename format */
+#define ISYSTEM 0x08000000 /* system file */
+
#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */
+#define IARCHIVE 0x40000000 /* file archive bit */
+#define INEWNAME 0x80000000 /* non-8.3 filename format */
+
+#define IRASH 0x4E000000 /* mask for changeable attributes */
#define ATTRSHIFT 25 /* bits to shift to move attribute
specification to mode position */
+/* extended attributes for Linux */
+
+#define JFS_NOATIME_FL 0x00080000 /* do not update atime */
+
+#define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */
+#define JFS_SYNC_FL 0x00200000 /* Synchronous updates */
+#define JFS_SECRM_FL 0x00400000 /* Secure deletion */
+#define JFS_UNRM_FL 0x00800000 /* allow for undelete */
+
+#define JFS_APPEND_FL 0x01000000 /* writes to file may only append */
+#define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */
+
+#define JFS_FL_USER_VISIBLE 0x03F80000
+#define JFS_FL_USER_MODIFIABLE 0x03F80000
+#define JFS_FL_INHERIT 0x03C80000
+
+/* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
+#define JFS_IOC_GETFLAGS _IOR('f', 1, long)
+#define JFS_IOC_SETFLAGS _IOW('f', 2, long)
+
+
#endif /*_H_JFS_DINODE */