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architecture mods for v2 shortorm dirs
Merge of 2.3.99pre2-xfs:slinx:55580a by ananth.

  Merge of 2.3.42-xfs:slinx:55580a by ananth.

/*
 * Copyright (C) 1999 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */
#ifndef _FS_XFS_DIR2_SF_H
#define	_FS_XFS_DIR2_SF_H

#ident	"$Revision$"

/*
 * xfs_dir2_sf.h
 *
 * Directory layout when stored internal to an inode.
 *
 * Small directories are packed as tightly as possible so as to
 * fit into the literal area of the inode.
 */

struct dirent;
struct uio;
struct xfs_dabuf;
struct xfs_da_args;
struct xfs_dir2_block;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

/*
 * Maximum size of a shortform directory.
 */
#define	XFS_DIR2_SF_MAX_SIZE	\
	(XFS_DINODE_MAX_SIZE - (uint)sizeof(xfs_dinode_core_t) - \
	 (uint)sizeof(xfs_agino_t))

/*
 * Inode number stored as 8 8-bit values.
 */
typedef	struct { __uint8_t i[8]; } xfs_dir2_ino8_t;

#define	XFS_DIR2_SF_GET_INO8_ARCH(di,arch)	\
	(xfs_ino_t)(DIRINO_GET(&di,arch))
#define	XFS_DIR2_SF_GET_INO8(di)	        \
        XFS_DIR2_SF_GET_INO8_ARCH(di,XFS_ARCH_NATIVE)

/*
 * Inode number stored as 4 8-bit values.
 * Works a lot of the time, when all the inode numbers in a directory
 * fit in 32 bits.
 */
typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
#define	XFS_DIR2_SF_GET_INO4_ARCH(di,arch)	\
	(xfs_ino_t)(DIRINO4_GET(&di,arch))
#define	XFS_DIR2_SF_GET_INO4(di)	        \
	XFS_DIR2_SF_GET_INO4_ARCH(di,XFS_ARCH_NATIVE)

typedef union {
	xfs_dir2_ino8_t	i8;
	xfs_dir2_ino4_t	i4;
} xfs_dir2_inou_t;
#define	XFS_DIR2_MAX_SHORT_INUM	((xfs_ino_t)0xffffffffULL)

/*
 * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
 * Only need 16 bits, this is the byte offset into the single block form.
 */
typedef struct { __uint8_t i[2]; } xfs_dir2_sf_off_t;

/*
 * The parent directory has a dedicated field, and the self-pointer must
 * be calculated on the fly.
 *
 * Entries are packed toward the top as tightly as possible.  The header
 * and the elements must be bcopy()'d out into a work area to get correct
 * alignment for the inode number fields.
 */
typedef struct xfs_dir2_sf_hdr {
	__uint8_t		count;		/* count of entries */
	__uint8_t		i8count;	/* count of 8-byte inode #s */
	xfs_dir2_inou_t		parent;		/* parent dir inode number */
} xfs_dir2_sf_hdr_t;

typedef struct xfs_dir2_sf_entry {
	__uint8_t		namelen;	/* actual name length */
	xfs_dir2_sf_off_t	offset;		/* saved offset */
	__uint8_t		name[1];	/* name, variable size */
	xfs_dir2_inou_t		inumber;	/* inode number, var. offset */
} xfs_dir2_sf_entry_t;

typedef struct xfs_dir2_sf {
	xfs_dir2_sf_hdr_t	hdr;		/* shortform header */
	xfs_dir2_sf_entry_t	list[1];	/* shortform entries */
} xfs_dir2_sf_t;

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_HDR_SIZE)
int xfs_dir2_sf_hdr_size(int i8count);
#define	XFS_DIR2_SF_HDR_SIZE(i8count)	xfs_dir2_sf_hdr_size(i8count)
#else
#define	XFS_DIR2_SF_HDR_SIZE(i8count)	\
	((uint)sizeof(xfs_dir2_sf_hdr_t) - \
	 ((i8count) == 0) * \
	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_INUMBERP)
xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep);
#define	XFS_DIR2_SF_INUMBERP(sfep)	xfs_dir2_sf_inumberp(sfep)
#else
#define	XFS_DIR2_SF_INUMBERP(sfep)	\
	((xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen])
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_INUMBER)
xfs_intino_t xfs_dir2_sf_get_inumber_arch(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from, 
                                            xfs_arch_t arch);
#define	XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, from, arch)	\
	xfs_dir2_sf_get_inumber_arch(sfp, from, arch)
#else
#define	XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, from, arch)	\
	((sfp)->hdr.i8count == 0 ? \
		(xfs_intino_t)XFS_DIR2_SF_GET_INO4_ARCH(*(from), arch) : \
		(xfs_intino_t)XFS_DIR2_SF_GET_INO8_ARCH(*(from), arch))
#endif
#define	XFS_DIR2_SF_GET_INUMBER(sfp, from)	\
        XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, from, XFS_ARCH_NATIVE)

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_INUMBER)
void xfs_dir2_sf_put_inumber_arch(xfs_dir2_sf_t *sfp, xfs_ino_t *from,
			             xfs_dir2_inou_t *to, xfs_arch_t arch);
#define	XFS_DIR2_SF_PUT_INUMBER_ARCH(sfp,from,to,arch)	\
	xfs_dir2_sf_put_inumber_arch(sfp,from,to,arch)
#else
#define	XFS_DIR2_SF_PUT_INUMBER_ARCH(sfp,from,to,arch)	\
	if ((sfp)->hdr.i8count == 0) { \
            DIRINO4_COPY(from,to,arch); \
        } else { \
            DIRINO_COPY(from,to,arch); \
        }
#endif
#define	XFS_DIR2_SF_PUT_INUMBER(sfp,from,to)	        \
        XFS_DIR2_SF_PUT_INUMBER_ARCH(sfp,from,to,XFS_ARCH_NATIVE)	 

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_OFFSET)
xfs_dir2_data_aoff_t xfs_dir2_sf_get_offset_arch(xfs_dir2_sf_entry_t *sfep, 
                                                    xfs_arch_t arch);
#define	XFS_DIR2_SF_GET_OFFSET_ARCH(sfep,arch)	xfs_dir2_sf_get_offset_arch(sfep,arch)
#else
#define	XFS_DIR2_SF_GET_OFFSET_ARCH(sfep,arch)	\
        INT_GET_UNALIGNED_16(&(sfep)->offset.i,arch)
#endif
#define	XFS_DIR2_SF_GET_OFFSET(sfep)	\
        XFS_DIR2_SF_GET_OFFSET_ARCH(sfep,XFS_ARCH_NATIVE)

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_OFFSET)
void xfs_dir2_sf_put_offset_arch(xfs_dir2_sf_entry_t *sfep,
			            xfs_dir2_data_aoff_t off, xfs_arch_t arch);
#define	XFS_DIR2_SF_PUT_OFFSET_ARCH(sfep,off,arch)	xfs_dir2_sf_put_offset_arch(sfep,off,arch)
#else
#define	XFS_DIR2_SF_PUT_OFFSET_ARCH(sfep,off,arch)	\
        INT_SET_UNALIGNED_16(&(sfep)->offset.i,off,arch)
#endif
#define	XFS_DIR2_SF_PUT_OFFSET(sfep,off)	\
        XFS_DIR2_SF_PUT_OFFSET_ARCH(sfep,off,XFS_ARCH_NATIVE)

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYNAME)
int xfs_dir2_sf_entsize_byname(xfs_dir2_sf_t *sfp, int len);
#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len)	\
	xfs_dir2_sf_entsize_byname(sfp,len)
#else
#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len)	/* space a name uses */ \
	((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (len) - \
	 ((sfp)->hdr.i8count == 0) * \
	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYENTRY)
int xfs_dir2_sf_entsize_byentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep);
#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)	\
	xfs_dir2_sf_entsize_byentry(sfp,sfep)
#else
#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)	/* space an entry uses */ \
	((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (sfep)->namelen - \
	 ((sfp)->hdr.i8count == 0) * \
	 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_FIRSTENTRY)
xfs_dir2_sf_entry_t *xfs_dir2_sf_firstentry(xfs_dir2_sf_t *sfp);
#define XFS_DIR2_SF_FIRSTENTRY(sfp)	xfs_dir2_sf_firstentry(sfp)
#else
#define XFS_DIR2_SF_FIRSTENTRY(sfp)	/* first entry in struct */ \
	((xfs_dir2_sf_entry_t *) \
	 ((char *)(sfp) + XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_NEXTENTRY)
xfs_dir2_sf_entry_t *xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp,
					   xfs_dir2_sf_entry_t *sfep);
#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep)		xfs_dir2_sf_nextentry(sfp,sfep)
#else
#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep)		/* next entry in struct */ \
	((xfs_dir2_sf_entry_t *) \
		((char *)(sfep) + XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)))
#endif

/*
 * Functions.
 */

extern int
	xfs_dir2_block_sfsize(struct xfs_inode *dp,
			      struct xfs_dir2_block *block,
			      xfs_dir2_sf_hdr_t *sfhp);

#if defined(XFS_REPAIR_SIM) || !defined(SIM)
extern int
	xfs_dir2_block_to_sf(struct xfs_da_args *args, struct xfs_dabuf *bp,
			     int size, xfs_dir2_sf_hdr_t *sfhp);
#endif /* XFS_REPAIR_SIM || !SIM */

extern int
	xfs_dir2_sf_addname(struct xfs_da_args *args);

extern int
	xfs_dir2_sf_create(struct xfs_da_args *args, xfs_ino_t pino);

#ifndef SIM
extern int
	xfs_dir2_sf_getdents(struct xfs_inode *dp, struct uio *uio, int *eofp,
			     struct dirent *dbp, xfs_dir2_put_t put);
#endif /* !SIM */

extern int
	xfs_dir2_sf_lookup(struct xfs_da_args *args);

#if defined(XFS_REPAIR_SIM) || !defined(SIM)
extern int
	xfs_dir2_sf_removename(struct xfs_da_args *args);

extern int
	xfs_dir2_sf_replace(struct xfs_da_args *args);
#endif /* XFS_REPAIR_SIM || !SIM */

#endif	/* !_FS_XFS_DIR2_SF_H */