patch-2.1.112 linux/fs/ufs/ufs_swab.c

• Lines: 179
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.111/linux/fs/ufs/ufs_swab.c
• Orig date: Tue Feb 17 13:12:48 1998

diff -u --recursive --new-file v2.1.111/linux/fs/ufs/ufs_swab.c linux/fs/ufs/ufs_swab.c
@@ -1,178 +0,0 @@
-/*
- *  linux/fs/ufs/ufs_swab.c
- *
- * Copyright (C) 1997
- * Francois-Rene Rideau <[email protected]>
- *
- */
-
-/*
- * For inspiration, you might wanna check sys/ufs/ffs/fs.h from whateverBSD
- *
- * NOTES
- * 19970406 - Fare <[email protected]>
- *   1) I began from old very preliminary 2.0.x sources,
- *	but it was underfeatured;
- *	I later saw that 2.1.1 sources had a *global* UFS byteswap flag.
- *	EVIL: imagine that a swabbed partition be mounted
- *	while a non-swabbed partition are active (that sucks!)
- *	I merged that source tree with mine.
- *   2) I hope no one is using obNNUUXXIIous byteorder.
- *	That's the only thing I might have broken,
- *	though I rather think it's a fix:
- *	instead of __u64 like BSD,
- *	the former driver used an explicitly bigendian array of __u32!
- *   3) I provide a few macros that use GCC C Extensions.
- *	Port to other compilers would require avoiding them.
- *	in any case, 64 bit (long long) support is required,
- *	unless you're ready to workaround
- *   4) the swab routines below depend on the precise name and order
- *	of the structure elements. Watch out any modification in ufs_fs.h!!!
- *   5) putting byteswapping stuff in ufs_swab* seems cleaner to me.
- *   6) These sources should work with both 2.0 and 2.1 kernels...
- *
- * 19971013 - Fare <[email protected]>
- *   1) Ported to 2.1.57
- *   2) instead of byteswapping, use [bl]e_to_cpu:
- *     it might be that we run on a VAX!
- *
- * 4.4BSD (FreeBSD) support added on February 1st 1998 by
- * Niels Kristian Bech Jensen <[email protected]> partially based
- * on code by Martin von Loewis <[email protected]>.
- *
- * HOWTO continue adding swab support:
- *	basically, anywhere metadata is bread() (i.e. mapped to block device),
- *      data should either be SWAB()ed on the fly,
- *      or copied to a buffer and globally bswap_ufs_*() there.
- *
- */
-
-#include <linux/fs.h>
-#include "ufs_swab.h"
-
-static __inline__ void n_be16_to_cpus(__u16*p,unsigned n) {
-#ifndef __BIG_ENDIAN
-        unsigned i;
-        for(i=0;i<n;i++) {
-		be16_to_cpus(&p[i]);
-        }
-#endif
-}
-static __inline__ void n_be32_to_cpus(__u32*p,unsigned n) {
-#ifndef __BIG_ENDIAN
-        unsigned i;
-        for(i=0;i<n;i++) {
-		be32_to_cpus(&p[i]);
-        }
-#endif
-}
-static __inline__ void n_le16_to_cpus(__u16*p,unsigned n) {
-#ifndef __LITTLE_ENDIAN
-        unsigned i;
-        for(i=0;i<n;i++) {
-		le16_to_cpus(&p[i]);
-        }
-#endif
-}
-static __inline__ void n_le32_to_cpus(__u32*p,unsigned n) {
-#ifndef __LITTLE_ENDIAN
-        unsigned i;
-        for(i=0;i<n;i++) {
-		le32_to_cpus(&p[i]);
-        }
-#endif
-}
-
-#define __length_before(p,member) \
-        ((unsigned)(((char*)&((p)->member))-(char*)(p)))
-#define __length_since(p,member) \
-        ((unsigned)(sizeof(*p)-__length_before(p,member)))
-#define __length_between(p,begin,after_end) \
-        ((unsigned)(__length_before(p,after_end)-__length_before(p,begin)))
-#define be32_to_cpus__between(s,begin,after_end) \
-        n_be32_to_cpus((__u32*)&((s).begin), \
-                __length_between(&s,begin,after_end)/4)
-#define le32_to_cpus__between(s,begin,after_end) \
-        n_le32_to_cpus((__u32*)&((s).begin), \
-                __length_between(&s,begin,after_end)/4)
-#define be32_to_cpus__since(s,begin) \
-	n_be32_to_cpus((__u32*)&((s).begin), \
-                __length_since(&s,begin)/4)
-#define le32_to_cpus__since(s,begin) \
-	n_le32_to_cpus((__u32*)&((s).begin), \
-                __length_since(&s,begin)/4)
-#define be16_to_cpus__between(s,begin,after_end) \
-	n_be16_to_cpus((__u16*)&((s).begin), \
-                __length_between(&s,begin,after_end)/2)
-#define le16_to_cpus__between(s,begin,after_end) \
-	n_le16_to_cpus((__u16*)&((s).begin), \
-                __length_between(&s,begin,after_end)/2)
-
-/*
- * Here are the whole-structure swabping routines...
- * They were fun to design, but I don't understand why we
- * need a copy of the superblock, anyway. -- Fare'
- */
-
-extern void ufs_superblock_be_to_cpus(struct ufs_superblock * usb) {
-#ifndef __BIG_ENDIAN
-	__u16 sb_type = 1;	/* SUN type superblock */
-
-	if (usb->fs_u.fs_44.fs_maxsymlinklen >= 0)
-		sb_type = 0;	/* 4.4BSD (FreeBSD) type superblock */
- 
-	be32_to_cpus__between(*usb,fs_link,fs_fmod);
-        /* XXX - I dunno what to do w/ fs_csp,
-         * but it is unused by the current code, so that's ok for now.
-         */
-	be32_to_cpus(&usb->fs_cpc);
-	if (sb_type) {
-        	be16_to_cpus__between(*usb,fs_opostbl,fs_u.fs_sun.fs_sparecon);
-        	be32_to_cpus__between(*usb,fs_u.fs_sun.fs_sparecon,fs_u.fs_sun.fs_qbmask);
-                /* Might fail on strictly aligning 64-bit big-endian
-                 * architectures. Ouch!
-                 */
-        	be64_to_cpus((__u64 *) &usb->fs_u.fs_sun.fs_qbmask);
-        	be64_to_cpus((__u64 *) &usb->fs_u.fs_sun.fs_qfmask);
-	} else {
-        	be16_to_cpus__between(*usb,fs_opostbl,fs_u.fs_44.fs_sparecon);
-        	be32_to_cpus__between(*usb,fs_u.fs_sun.fs_sparecon,fs_u.fs_44.fs_maxfilesize);
-        	be64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_maxfilesize);
-        	be64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_qbmask);
-        	be64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_qfmask);
-        	be32_to_cpus((__s32 *) &usb->fs_u.fs_44.fs_state);
-	}
-	be32_to_cpus__between(*usb,fs_postblformat,fs_magic);
-#endif
-}
-extern void ufs_superblock_le_to_cpus(struct ufs_superblock * usb) {
-#ifndef __LITTLE_ENDIAN
-	__u16 sb_type = 1;	/* SUN type superblock */
-
-	if (usb->fs_u.fs_44.fs_maxsymlinklen >= 0)
-		sb_type = 0;	/* 4.4BSD (FreeBSD) type superblock */
- 
-	le32_to_cpus__between(*usb,fs_link,fs_fmod);
-        /* XXX - I dunno what to do w/ fs_csp,
-         * but it is unused by the current code, so that's ok for now.
-         */
-	le32_to_cpus(&usb->fs_cpc);
-	if (sb_type) {
-        	le16_to_cpus__between(*usb,fs_opostbl,fs_u.fs_sun.fs_sparecon);
-        	le32_to_cpus__between(*usb,fs_u.fs_sun.fs_sparecon,fs_u.fs_sun.fs_qbmask);
-                /* Might fail on strictly aligning 64-bit big-endian
-                 * architectures. Ouch!
-                 */
-        	le64_to_cpus((__u64 *) &usb->fs_u.fs_sun.fs_qbmask);
-        	le64_to_cpus((__u64 *) &usb->fs_u.fs_sun.fs_qfmask);
-	} else {
-        	le16_to_cpus__between(*usb,fs_opostbl,fs_u.fs_44.fs_sparecon);
-        	le32_to_cpus__between(*usb,fs_u.fs_sun.fs_sparecon,fs_u.fs_44.fs_maxfilesize);
-        	le64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_maxfilesize);
-        	le64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_qbmask);
-        	le64_to_cpus((__u64 *) &usb->fs_u.fs_44.fs_qfmask);
-        	le32_to_cpus((__s32 *) &usb->fs_u.fs_44.fs_state);
-	}
-	le32_to_cpus__between(*usb,fs_postblformat,fs_magic);
-#endif
-}