mirror of https://gitee.com/openkylin/linux.git
160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
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/*
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* Copyright (c) 2000 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_NODE_H__
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#define __XFS_DIR2_NODE_H__
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/*
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* Directory version 2, btree node format structures
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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_da_state;
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struct xfs_da_state_blk;
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struct xfs_inode;
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struct xfs_trans;
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/*
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* Constants.
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*/
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/*
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* Offset of the freespace index.
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*/
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#define XFS_DIR2_FREE_SPACE 2
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#define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
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#define XFS_DIR2_FREE_FIRSTDB(mp) \
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XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_FREE_OFFSET)
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#define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */
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/*
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* Structures.
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*/
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typedef struct xfs_dir2_free_hdr {
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__uint32_t magic; /* XFS_DIR2_FREE_MAGIC */
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__int32_t firstdb; /* db of first entry */
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__int32_t nvalid; /* count of valid entries */
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__int32_t nused; /* count of used entries */
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} xfs_dir2_free_hdr_t;
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typedef struct xfs_dir2_free {
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xfs_dir2_free_hdr_t hdr; /* block header */
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xfs_dir2_data_off_t bests[1]; /* best free counts */
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/* unused entries are -1 */
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} xfs_dir2_free_t;
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#define XFS_DIR2_MAX_FREE_BESTS(mp) \
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(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \
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(uint)sizeof(xfs_dir2_data_off_t))
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/*
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* Macros.
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*/
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/*
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* Convert data space db to the corresponding free db.
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*/
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDB)
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xfs_dir2_db_t
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xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db);
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#define XFS_DIR2_DB_TO_FDB(mp,db) xfs_dir2_db_to_fdb(mp, db)
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#else
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#define XFS_DIR2_DB_TO_FDB(mp,db) \
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(XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp))
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#endif
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/*
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* Convert data space db to the corresponding index in a free db.
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*/
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDINDEX)
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int
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xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db);
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#define XFS_DIR2_DB_TO_FDINDEX(mp,db) xfs_dir2_db_to_fdindex(mp, db)
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#else
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#define XFS_DIR2_DB_TO_FDINDEX(mp,db) ((db) % XFS_DIR2_MAX_FREE_BESTS(mp))
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#endif
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/*
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* Functions.
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*/
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extern void
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xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp,
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int first, int last);
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extern int
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xfs_dir2_leaf_to_node(struct xfs_da_args *args, struct xfs_dabuf *lbp);
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extern xfs_dahash_t
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xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count);
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extern int
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xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp,
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struct xfs_da_args *args, int *indexp,
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struct xfs_da_state *state);
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extern int
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xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp,
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struct xfs_dabuf *leaf2_bp);
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extern int
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xfs_dir2_leafn_split(struct xfs_da_state *state,
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struct xfs_da_state_blk *oldblk,
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struct xfs_da_state_blk *newblk);
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extern int
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xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action);
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extern void
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xfs_dir2_leafn_unbalance(struct xfs_da_state *state,
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struct xfs_da_state_blk *drop_blk,
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struct xfs_da_state_blk *save_blk);
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extern int
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xfs_dir2_node_addname(struct xfs_da_args *args);
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extern int
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xfs_dir2_node_lookup(struct xfs_da_args *args);
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extern int
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xfs_dir2_node_removename(struct xfs_da_args *args);
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extern int
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xfs_dir2_node_replace(struct xfs_da_args *args);
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extern int
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xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo,
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int *rvalp);
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#endif /* __XFS_DIR2_NODE_H__ */
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