Commit fa3241d2 authored by Herbert Poetzl's avatar Herbert Poetzl Committed by Dave Kleikamp
Browse files

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: default avatarHerbert Poetzl <herbert@13thfloor.at>
Signed-off-by: default avatarDave Kleikamp <shaggy@austin.ibm.com>
parent 1de87444

fs/jfs/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -8,7 +8,8 @@ jfs-y := super.o file.o inode.o namei.o jfs_mount.o jfs_umount.o \ 
	    jfs_xtree.o jfs_imap.o jfs_debug.o jfs_dmap.o \

	    jfs_unicode.o jfs_dtree.o jfs_inode.o \

	    jfs_extent.o symlink.o jfs_metapage.o \

	    jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o resize.o xattr.o

	    jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o \

	    resize.o xattr.o ioctl.o



jfs-$(CONFIG_JFS_POSIX_ACL) += acl.o

fs/jfs/file.c

+1 −0
Original line number Diff line number Diff line
@@ -113,4 +113,5 @@ struct file_operations jfs_file_operations = { 
 	.sendfile	= generic_file_sendfile,

	.fsync		= jfs_fsync,

	.release	= jfs_release,

	.ioctl		= jfs_ioctl,

};

fs/jfs/inode.c

+1 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ void jfs_read_inode(struct inode *inode) 
		inode->i_op = &jfs_file_inode_operations;

		init_special_inode(inode, inode->i_mode, inode->i_rdev);

	}

	jfs_set_inode_flags(inode);

}



/*

fs/jfs/jfs_dinode.h

+27 −4
Original line number Diff line number Diff line
@@ -139,13 +139,36 @@ struct dinode { 


/* 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 */

fs/jfs/jfs_inode.c

+34 −3
Original line number Diff line number Diff line
@@ -25,6 +25,26 @@ 
#include "jfs_dinode.h"

#include "jfs_debug.h"





void jfs_set_inode_flags(struct inode *inode)

{

	unsigned int flags = JFS_IP(inode)->mode2;



	inode->i_flags &= ~(S_IMMUTABLE | S_APPEND |

		S_NOATIME | S_DIRSYNC | S_SYNC);



	if (flags & JFS_IMMUTABLE_FL)

		inode->i_flags |= S_IMMUTABLE;

	if (flags & JFS_APPEND_FL)

		inode->i_flags |= S_APPEND;

	if (flags & JFS_NOATIME_FL)

		inode->i_flags |= S_NOATIME;

	if (flags & JFS_DIRSYNC_FL)

		inode->i_flags |= S_DIRSYNC;

	if (flags & JFS_SYNC_FL)

		inode->i_flags |= S_SYNC;

}



/*

 * NAME:	ialloc()

 *
@@ -74,10 +94,20 @@ struct inode *ialloc(struct inode *parent, umode_t mode) 
	}



	inode->i_mode = mode;

	if (S_ISDIR(mode))

		jfs_inode->mode2 = IDIRECTORY | mode;

	/* inherit flags from parent */

	jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;



	if (S_ISDIR(mode)) {

		jfs_inode->mode2 |= IDIRECTORY;

		jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;

	}

	else if (S_ISLNK(mode))

		jfs_inode->mode2 &=

			~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);

	else

		jfs_inode->mode2 = INLINEEA | ISPARSE | mode;

		jfs_inode->mode2 |= INLINEEA | ISPARSE;

	jfs_inode->mode2 |= mode;



	inode->i_blksize = sb->s_blocksize;

	inode->i_blocks = 0;

	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
@@ -98,6 +128,7 @@ struct inode *ialloc(struct inode *parent, umode_t mode) 
	jfs_inode->atlhead = 0;

	jfs_inode->atltail = 0;

	jfs_inode->xtlid = 0;

	jfs_set_inode_flags(inode);



	jfs_info("ialloc returns inode = 0x%p\n", inode);

CRA Git | Maintained and supported by SUSTech CRA and CCSE