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Diffstat (limited to 'fs/xfs/xfs_dir2_leaf.h')
| -rw-r--r-- | fs/xfs/xfs_dir2_leaf.h | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_leaf.h b/fs/xfs/xfs_dir2_leaf.h new file mode 100644 index 000000000000..7f20eee56a52 --- /dev/null +++ b/fs/xfs/xfs_dir2_leaf.h @@ -0,0 +1,360 @@ +/* + * Copyright (c) 2000-2001 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_LEAF_H__ +#define __XFS_DIR2_LEAF_H__ + +/* + * Directory version 2, leaf block structures. + */ + +struct uio; +struct xfs_dabuf; +struct xfs_da_args; +struct xfs_inode; +struct xfs_mount; +struct xfs_trans; + +/* + * Constants. + */ + +/* + * Offset of the leaf/node space. First block in this space + * is the btree root. + */ +#define XFS_DIR2_LEAF_SPACE 1 +#define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE) +#define XFS_DIR2_LEAF_FIRSTDB(mp) \ + XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET) + +/* + * Types. + */ + +/* + * Offset in data space of a data entry. + */ +typedef __uint32_t xfs_dir2_dataptr_t; +#define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff) +#define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0) + +/* + * Structures. + */ + +/* + * Leaf block header. + */ +typedef struct xfs_dir2_leaf_hdr { + xfs_da_blkinfo_t info; /* header for da routines */ + __uint16_t count; /* count of entries */ + __uint16_t stale; /* count of stale entries */ +} xfs_dir2_leaf_hdr_t; + +/* + * Leaf block entry. + */ +typedef struct xfs_dir2_leaf_entry { + xfs_dahash_t hashval; /* hash value of name */ + xfs_dir2_dataptr_t address; /* address of data entry */ +} xfs_dir2_leaf_entry_t; + +/* + * Leaf block tail. + */ +typedef struct xfs_dir2_leaf_tail { + __uint32_t bestcount; +} xfs_dir2_leaf_tail_t; + +/* + * Leaf block. + * bests and tail are at the end of the block for single-leaf only + * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC). + */ +typedef struct xfs_dir2_leaf { + xfs_dir2_leaf_hdr_t hdr; /* leaf header */ + xfs_dir2_leaf_entry_t ents[1]; /* entries */ + /* ... */ + xfs_dir2_data_off_t bests[1]; /* best free counts */ + xfs_dir2_leaf_tail_t tail; /* leaf tail */ +} xfs_dir2_leaf_t; + +/* + * Macros. + * The DB blocks are logical directory block numbers, not filesystem blocks. + */ + +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_MAX_LEAF_ENTS) +int +xfs_dir2_max_leaf_ents(struct xfs_mount *mp); +#define XFS_DIR2_MAX_LEAF_ENTS(mp) \ + xfs_dir2_max_leaf_ents(mp) +#else +#define XFS_DIR2_MAX_LEAF_ENTS(mp) \ + ((int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) / \ + (uint)sizeof(xfs_dir2_leaf_entry_t))) +#endif + +/* + * Get address of the bestcount field in the single-leaf block. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_TAIL_P) +xfs_dir2_leaf_tail_t * +xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp); +#define XFS_DIR2_LEAF_TAIL_P(mp,lp) \ + xfs_dir2_leaf_tail_p(mp, lp) +#else +#define XFS_DIR2_LEAF_TAIL_P(mp,lp) \ + ((xfs_dir2_leaf_tail_t *)\ + ((char *)(lp) + (mp)->m_dirblksize - \ + (uint)sizeof(xfs_dir2_leaf_tail_t))) +#endif + +/* + * Get address of the bests array in the single-leaf block. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_LEAF_BESTS_P) +xfs_dir2_data_off_t * +xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp); +#define XFS_DIR2_LEAF_BESTS_P(ltp) xfs_dir2_leaf_bests_p(ltp) +#else +#define XFS_DIR2_LEAF_BESTS_P(ltp) \ + ((xfs_dir2_data_off_t *)(ltp) - INT_GET((ltp)->bestcount, ARCH_CONVERT)) +#endif + +/* + * Convert dataptr to byte in file space + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_BYTE) +xfs_dir2_off_t +xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp); +#define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp) +#else +#define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) \ + ((xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG) +#endif + +/* + * Convert byte in file space to dataptr. It had better be aligned. + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DATAPTR) +xfs_dir2_dataptr_t +xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by); +#define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by) +#else +#define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) \ + ((xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG)) +#endif + +/* + * Convert dataptr to a block number + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_DB) +xfs_dir2_db_t +xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp); +#define XFS_DIR2_DATAPTR_TO_DB(mp,dp) xfs_dir2_dataptr_to_db(mp, dp) +#else +#define XFS_DIR2_DATAPTR_TO_DB(mp,dp) \ + XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp)) +#endif + +/* + * Convert dataptr to a byte offset in a block + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATAPTR_TO_OFF) +xfs_dir2_data_aoff_t +xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp); +#define XFS_DIR2_DATAPTR_TO_OFF(mp,dp) xfs_dir2_dataptr_to_off(mp, dp) +#else +#define XFS_DIR2_DATAPTR_TO_OFF(mp,dp) \ + XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp)) +#endif + +/* + * Convert block and offset to byte in space + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_BYTE) +xfs_dir2_off_t +xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db, + xfs_dir2_data_aoff_t o); +#define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o) \ + xfs_dir2_db_off_to_byte(mp, db, o) +#else +#define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o) \ + (((xfs_dir2_off_t)(db) << \ + ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o)) +#endif + +/* + * Convert byte in space to (DB) block + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DB) +xfs_dir2_db_t xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by); +#define XFS_DIR2_BYTE_TO_DB(mp,by) xfs_dir2_byte_to_db(mp, by) +#else +#define XFS_DIR2_BYTE_TO_DB(mp,by) \ + ((xfs_dir2_db_t)((by) >> \ + ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog))) +#endif + +/* + * Convert byte in space to (DA) block + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_DA) +xfs_dablk_t xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by); +#define XFS_DIR2_BYTE_TO_DA(mp,by) xfs_dir2_byte_to_da(mp, by) +#else +#define XFS_DIR2_BYTE_TO_DA(mp,by) \ + XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by)) +#endif + +/* + * Convert byte in space to offset in a block + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_BYTE_TO_OFF) +xfs_dir2_data_aoff_t +xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by); +#define XFS_DIR2_BYTE_TO_OFF(mp,by) xfs_dir2_byte_to_off(mp, by) +#else +#define XFS_DIR2_BYTE_TO_OFF(mp,by) \ + ((xfs_dir2_data_aoff_t)((by) & \ + ((1 << ((mp)->m_sb.sb_blocklog + \ + (mp)->m_sb.sb_dirblklog)) - 1))) +#endif + +/* + * Convert block and offset to dataptr + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_OFF_TO_DATAPTR) +xfs_dir2_dataptr_t +xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db, + xfs_dir2_data_aoff_t o); +#define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o) \ + xfs_dir2_db_off_to_dataptr(mp, db, o) +#else +#define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o) \ + XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o)) +#endif + +/* + * Convert block (DB) to block (dablk) + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DB_TO_DA) +xfs_dablk_t xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db); +#define XFS_DIR2_DB_TO_DA(mp,db) xfs_dir2_db_to_da(mp, db) +#else +#define XFS_DIR2_DB_TO_DA(mp,db) \ + ((xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog)) +#endif + +/* + * Convert block (dablk) to block (DB) + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_DB) +xfs_dir2_db_t xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da); +#define XFS_DIR2_DA_TO_DB(mp,da) xfs_dir2_da_to_db(mp, da) +#else +#define XFS_DIR2_DA_TO_DB(mp,da) \ + ((xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog)) +#endif + +/* + * Convert block (dablk) to byte offset in space + */ +#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DA_TO_BYTE) +xfs_dir2_off_t xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da); +#define XFS_DIR2_DA_TO_BYTE(mp,da) xfs_dir2_da_to_byte(mp, da) +#else +#define XFS_DIR2_DA_TO_BYTE(mp,da) \ + XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0) +#endif + +/* + * Function declarations. + */ + +extern int + xfs_dir2_block_to_leaf(struct xfs_da_args *args, struct xfs_dabuf *dbp); + +extern int + xfs_dir2_leaf_addname(struct xfs_da_args *args); + +extern void + xfs_dir2_leaf_compact(struct xfs_da_args *args, struct xfs_dabuf *bp); + +extern void + xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp, + int *lowstalep, int *highstalep, int *lowlogp, + int *highlogp); + +extern int + xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp, + struct uio *uio, int *eofp, struct xfs_dirent *dbp, + xfs_dir2_put_t put); + +extern int + xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno, + struct xfs_dabuf **bpp, int magic); + +extern void + xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp, + int first, int last); + +extern void + xfs_dir2_leaf_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, + int first, int last); + +extern void + xfs_dir2_leaf_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp); + +extern void + xfs_dir2_leaf_log_tail(struct xfs_trans *tp, struct xfs_dabuf *bp); + +extern int + xfs_dir2_leaf_lookup(struct xfs_da_args *args); + +extern int + xfs_dir2_leaf_removename(struct xfs_da_args *args); + +extern int + xfs_dir2_leaf_replace(struct xfs_da_args *args); + +extern int + xfs_dir2_leaf_search_hash(struct xfs_da_args *args, + struct xfs_dabuf *lbp); +extern int + xfs_dir2_leaf_trim_data(struct xfs_da_args *args, struct xfs_dabuf *lbp, xfs_dir2_db_t db); + +extern int + xfs_dir2_node_to_leaf(struct xfs_da_state *state); + +#endif /* __XFS_DIR2_LEAF_H__ */ |