244 lines
7.9 KiB
C
244 lines
7.9 KiB
C
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/*
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* Copyright (c) 2000-2001 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_DIR2_SF_H__
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#define __XFS_DIR2_SF_H__
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/*
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* Directory layout when stored internal to an inode.
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*
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* Small directories are packed as tightly as possible so as to
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* fit into the literal area of the inode.
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*/
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struct uio;
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struct xfs_dabuf;
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struct xfs_da_args;
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struct xfs_dir2_block;
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struct xfs_inode;
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struct xfs_mount;
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struct xfs_trans;
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/*
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* Maximum size of a shortform directory.
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*/
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#define XFS_DIR2_SF_MAX_SIZE \
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(XFS_DINODE_MAX_SIZE - (uint)sizeof(xfs_dinode_core_t) - \
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(uint)sizeof(xfs_agino_t))
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/*
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* Inode number stored as 8 8-bit values.
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*/
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typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t;
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/*
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* Inode number stored as 4 8-bit values.
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* Works a lot of the time, when all the inode numbers in a directory
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* fit in 32 bits.
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*/
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typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
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typedef union {
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xfs_dir2_ino8_t i8;
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xfs_dir2_ino4_t i4;
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} xfs_dir2_inou_t;
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#define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL)
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/*
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* Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
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* Only need 16 bits, this is the byte offset into the single block form.
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*/
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typedef struct { __uint8_t i[2]; } xfs_dir2_sf_off_t;
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/*
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* The parent directory has a dedicated field, and the self-pointer must
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* be calculated on the fly.
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*
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* Entries are packed toward the top as tightly as possible. The header
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* and the elements must be memcpy'd out into a work area to get correct
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* alignment for the inode number fields.
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*/
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typedef struct xfs_dir2_sf_hdr {
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__uint8_t count; /* count of entries */
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__uint8_t i8count; /* count of 8-byte inode #s */
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xfs_dir2_inou_t parent; /* parent dir inode number */
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} xfs_dir2_sf_hdr_t;
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typedef struct xfs_dir2_sf_entry {
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__uint8_t namelen; /* actual name length */
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xfs_dir2_sf_off_t offset; /* saved offset */
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__uint8_t name[1]; /* name, variable size */
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xfs_dir2_inou_t inumber; /* inode number, var. offset */
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} xfs_dir2_sf_entry_t;
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typedef struct xfs_dir2_sf {
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xfs_dir2_sf_hdr_t hdr; /* shortform header */
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xfs_dir2_sf_entry_t list[1]; /* shortform entries */
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} xfs_dir2_sf_t;
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_HDR_SIZE)
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int xfs_dir2_sf_hdr_size(int i8count);
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#define XFS_DIR2_SF_HDR_SIZE(i8count) xfs_dir2_sf_hdr_size(i8count)
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#else
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#define XFS_DIR2_SF_HDR_SIZE(i8count) \
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((uint)sizeof(xfs_dir2_sf_hdr_t) - \
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((i8count) == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_INUMBERP)
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xfs_dir2_inou_t *xfs_dir2_sf_inumberp(xfs_dir2_sf_entry_t *sfep);
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#define XFS_DIR2_SF_INUMBERP(sfep) xfs_dir2_sf_inumberp(sfep)
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#else
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#define XFS_DIR2_SF_INUMBERP(sfep) \
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((xfs_dir2_inou_t *)&(sfep)->name[(sfep)->namelen])
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_INUMBER)
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xfs_intino_t xfs_dir2_sf_get_inumber(xfs_dir2_sf_t *sfp, xfs_dir2_inou_t *from);
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#define XFS_DIR2_SF_GET_INUMBER(sfp, from) \
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xfs_dir2_sf_get_inumber(sfp, from)
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#else
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#define XFS_DIR2_SF_GET_INUMBER(sfp, from) \
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((sfp)->hdr.i8count == 0 ? \
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(xfs_intino_t)XFS_GET_DIR_INO4((from)->i4) : \
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(xfs_intino_t)XFS_GET_DIR_INO8((from)->i8))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_INUMBER)
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void xfs_dir2_sf_put_inumber(xfs_dir2_sf_t *sfp, xfs_ino_t *from,
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xfs_dir2_inou_t *to);
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#define XFS_DIR2_SF_PUT_INUMBER(sfp,from,to) \
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xfs_dir2_sf_put_inumber(sfp,from,to)
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#else
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#define XFS_DIR2_SF_PUT_INUMBER(sfp,from,to) \
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if ((sfp)->hdr.i8count == 0) { \
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XFS_PUT_DIR_INO4(*(from), (to)->i4); \
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} else { \
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XFS_PUT_DIR_INO8(*(from), (to)->i8); \
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}
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_GET_OFFSET)
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xfs_dir2_data_aoff_t xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep);
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#define XFS_DIR2_SF_GET_OFFSET(sfep) \
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xfs_dir2_sf_get_offset(sfep)
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#else
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#define XFS_DIR2_SF_GET_OFFSET(sfep) \
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INT_GET_UNALIGNED_16_BE(&(sfep)->offset.i)
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_PUT_OFFSET)
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void xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep,
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xfs_dir2_data_aoff_t off);
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#define XFS_DIR2_SF_PUT_OFFSET(sfep,off) \
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xfs_dir2_sf_put_offset(sfep,off)
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#else
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#define XFS_DIR2_SF_PUT_OFFSET(sfep,off) \
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INT_SET_UNALIGNED_16_BE(&(sfep)->offset.i,off)
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYNAME)
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int xfs_dir2_sf_entsize_byname(xfs_dir2_sf_t *sfp, int len);
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#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len) \
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xfs_dir2_sf_entsize_byname(sfp,len)
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#else
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#define XFS_DIR2_SF_ENTSIZE_BYNAME(sfp,len) /* space a name uses */ \
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((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (len) - \
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((sfp)->hdr.i8count == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_ENTSIZE_BYENTRY)
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int xfs_dir2_sf_entsize_byentry(xfs_dir2_sf_t *sfp, xfs_dir2_sf_entry_t *sfep);
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#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep) \
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xfs_dir2_sf_entsize_byentry(sfp,sfep)
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#else
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#define XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep) /* space an entry uses */ \
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((uint)sizeof(xfs_dir2_sf_entry_t) - 1 + (sfep)->namelen - \
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((sfp)->hdr.i8count == 0) * \
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((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_FIRSTENTRY)
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xfs_dir2_sf_entry_t *xfs_dir2_sf_firstentry(xfs_dir2_sf_t *sfp);
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#define XFS_DIR2_SF_FIRSTENTRY(sfp) xfs_dir2_sf_firstentry(sfp)
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#else
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#define XFS_DIR2_SF_FIRSTENTRY(sfp) /* first entry in struct */ \
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((xfs_dir2_sf_entry_t *) \
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((char *)(sfp) + XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_SF_NEXTENTRY)
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xfs_dir2_sf_entry_t *xfs_dir2_sf_nextentry(xfs_dir2_sf_t *sfp,
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xfs_dir2_sf_entry_t *sfep);
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#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep) xfs_dir2_sf_nextentry(sfp,sfep)
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#else
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#define XFS_DIR2_SF_NEXTENTRY(sfp,sfep) /* next entry in struct */ \
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((xfs_dir2_sf_entry_t *) \
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((char *)(sfep) + XFS_DIR2_SF_ENTSIZE_BYENTRY(sfp,sfep)))
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#endif
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/*
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* Functions.
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*/
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extern int
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xfs_dir2_block_sfsize(struct xfs_inode *dp,
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struct xfs_dir2_block *block,
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xfs_dir2_sf_hdr_t *sfhp);
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extern int
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xfs_dir2_block_to_sf(struct xfs_da_args *args, struct xfs_dabuf *bp,
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int size, xfs_dir2_sf_hdr_t *sfhp);
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extern int
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xfs_dir2_sf_addname(struct xfs_da_args *args);
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extern int
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xfs_dir2_sf_create(struct xfs_da_args *args, xfs_ino_t pino);
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extern int
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xfs_dir2_sf_getdents(struct xfs_inode *dp, struct uio *uio, int *eofp,
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struct xfs_dirent *dbp, xfs_dir2_put_t put);
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extern int
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xfs_dir2_sf_lookup(struct xfs_da_args *args);
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extern int
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xfs_dir2_sf_removename(struct xfs_da_args *args);
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extern int
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xfs_dir2_sf_replace(struct xfs_da_args *args);
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#endif /* __XFS_DIR2_SF_H__ */
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