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Diffstat (limited to 'fs/xfs/xfs_dir2_node.h')
| -rw-r--r-- | fs/xfs/xfs_dir2_node.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_node.h b/fs/xfs/xfs_dir2_node.h new file mode 100644 index 000000000000..96db420c7c5c --- /dev/null +++ b/fs/xfs/xfs_dir2_node.h @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * 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. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ +#ifndef __XFS_DIR2_NODE_H__ +#define __XFS_DIR2_NODE_H__ + +/* + * Directory version 2, btree node format structures + */ + +struct uio; +struct xfs_dabuf; +struct xfs_da_args; +struct xfs_da_state; +struct xfs_da_state_blk; +struct xfs_inode; +struct xfs_trans; + +/* + * Constants. + */ + +/* + * Offset of the freespace index. + */ +#define XFS_DIR2_FREE_SPACE 2 +#define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE) +#define XFS_DIR2_FREE_FIRSTDB(mp) \ + XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_FREE_OFFSET) + +#define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */ + +/* + * Structures. + */ +typedef struct xfs_dir2_free_hdr { + __uint32_t magic; /* XFS_DIR2_FREE_MAGIC */ + __int32_t firstdb; /* db of first entry */ + __int32_t nvalid; /* count of valid entries */ + __int32_t nused; /* count of used entries */ +} xfs_dir2_free_hdr_t; + +typedef struct xfs_dir2_free { + xfs_dir2_free_hdr_t hdr; /* block header */ + xfs_dir2_data_off_t bests[1]; /* best free counts */ + /* unused entries are -1 */ +} xfs_dir2_free_t; +#define XFS_DIR2_MAX_FREE_BESTS(mp) \ + (((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \ + (uint)sizeof(xfs_dir2_data_off_t)) + +/* + * Macros. + */ + +/* + * Convert data space db to the corresponding free db. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDB) +xfs_dir2_db_t +xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db); +#define XFS_DIR2_DB_TO_FDB(mp,db) xfs_dir2_db_to_fdb(mp, db) +#else +#define XFS_DIR2_DB_TO_FDB(mp,db) \ + (XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp)) +#endif + +/* + * Convert data space db to the corresponding index in a free db. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_FDINDEX) +int +xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db); +#define XFS_DIR2_DB_TO_FDINDEX(mp,db) xfs_dir2_db_to_fdindex(mp, db) +#else +#define XFS_DIR2_DB_TO_FDINDEX(mp,db) ((db) % XFS_DIR2_MAX_FREE_BESTS(mp)) +#endif + +/* + * Functions. + */ + +extern void + xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, + int first, int last); + +extern int + xfs_dir2_leaf_to_node(struct xfs_da_args *args, struct xfs_dabuf *lbp); + +extern xfs_dahash_t + xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count); + +extern int + xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp, + struct xfs_da_args *args, int *indexp, + struct xfs_da_state *state); + +extern int + xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp, + struct xfs_dabuf *leaf2_bp); + +extern int + xfs_dir2_leafn_split(struct xfs_da_state *state, + struct xfs_da_state_blk *oldblk, + struct xfs_da_state_blk *newblk); + +extern int + xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action); + +extern void + xfs_dir2_leafn_unbalance(struct xfs_da_state *state, + struct xfs_da_state_blk *drop_blk, + struct xfs_da_state_blk *save_blk); + +extern int + xfs_dir2_node_addname(struct xfs_da_args *args); + +extern int + xfs_dir2_node_lookup(struct xfs_da_args *args); + +extern int + xfs_dir2_node_removename(struct xfs_da_args *args); + +extern int + xfs_dir2_node_replace(struct xfs_da_args *args); + +extern int + xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo, + int *rvalp); + +#endif /* __XFS_DIR2_NODE_H__ */ |