254 lines
7.0 KiB
C
254 lines
7.0 KiB
C
/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_DIR2_LEAF_H__
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#define __XFS_DIR2_LEAF_H__
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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_inode;
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struct xfs_mount;
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struct xfs_trans;
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/*
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* Offset of the leaf/node space. First block in this space
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* is the btree root.
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*/
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#define XFS_DIR2_LEAF_SPACE 1
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#define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
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#define XFS_DIR2_LEAF_FIRSTDB(mp) \
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xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET)
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/*
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* Offset in data space of a data entry.
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*/
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typedef __uint32_t xfs_dir2_dataptr_t;
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#define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff)
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#define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0)
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/*
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* Leaf block header.
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*/
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typedef struct xfs_dir2_leaf_hdr {
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xfs_da_blkinfo_t info; /* header for da routines */
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__be16 count; /* count of entries */
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__be16 stale; /* count of stale entries */
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} xfs_dir2_leaf_hdr_t;
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/*
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* Leaf block entry.
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*/
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typedef struct xfs_dir2_leaf_entry {
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__be32 hashval; /* hash value of name */
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__be32 address; /* address of data entry */
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} xfs_dir2_leaf_entry_t;
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/*
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* Leaf block tail.
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*/
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typedef struct xfs_dir2_leaf_tail {
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__be32 bestcount;
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} xfs_dir2_leaf_tail_t;
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/*
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* Leaf block.
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* bests and tail are at the end of the block for single-leaf only
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* (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC).
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*/
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typedef struct xfs_dir2_leaf {
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xfs_dir2_leaf_hdr_t hdr; /* leaf header */
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xfs_dir2_leaf_entry_t ents[1]; /* entries */
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/* ... */
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xfs_dir2_data_off_t bests[1]; /* best free counts */
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xfs_dir2_leaf_tail_t tail; /* leaf tail */
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} xfs_dir2_leaf_t;
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/*
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* DB blocks here are logical directory block numbers, not filesystem blocks.
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*/
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static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
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{
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return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) /
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(uint)sizeof(xfs_dir2_leaf_entry_t));
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}
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/*
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* Get address of the bestcount field in the single-leaf block.
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*/
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static inline xfs_dir2_leaf_tail_t *
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xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp)
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{
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return (xfs_dir2_leaf_tail_t *)
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((char *)(lp) + (mp)->m_dirblksize -
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(uint)sizeof(xfs_dir2_leaf_tail_t));
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}
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/*
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* Get address of the bests array in the single-leaf block.
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*/
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static inline __be16 *
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xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
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{
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return (__be16 *)ltp - be32_to_cpu(ltp->bestcount);
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}
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/*
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* Convert dataptr to byte in file space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
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{
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return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
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}
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/*
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* Convert byte in file space to dataptr. It had better be aligned.
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*/
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static inline xfs_dir2_dataptr_t
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xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
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{
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return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
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}
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/*
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* Convert byte in space to (DB) block
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
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{
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return (xfs_dir2_db_t)((by) >> \
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((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
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}
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/*
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* Convert dataptr to a block number
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
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{
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return xfs_dir2_byte_to_db(mp, xfs_dir2_dataptr_to_byte(mp, dp));
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}
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/*
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* Convert byte in space to offset in a block
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*/
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static inline xfs_dir2_data_aoff_t
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xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
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{
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return (xfs_dir2_data_aoff_t)((by) & \
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((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
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}
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/*
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* Convert dataptr to a byte offset in a block
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*/
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static inline xfs_dir2_data_aoff_t
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xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
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{
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return xfs_dir2_byte_to_off(mp, xfs_dir2_dataptr_to_byte(mp, dp));
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}
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/*
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* Convert block and offset to byte in space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
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xfs_dir2_data_aoff_t o)
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{
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return ((xfs_dir2_off_t)(db) << \
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((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
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}
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/*
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* Convert block (DB) to block (dablk)
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*/
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static inline xfs_dablk_t
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xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
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{
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return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
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}
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/*
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* Convert byte in space to (DA) block
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*/
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static inline xfs_dablk_t
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xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
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{
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return xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, by));
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}
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/*
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* Convert block and offset to dataptr
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*/
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static inline xfs_dir2_dataptr_t
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xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
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xfs_dir2_data_aoff_t o)
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{
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return xfs_dir2_byte_to_dataptr(mp, xfs_dir2_db_off_to_byte(mp, db, o));
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}
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/*
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* Convert block (dablk) to block (DB)
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*/
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static inline xfs_dir2_db_t
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xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
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{
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return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
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}
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/*
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* Convert block (dablk) to byte offset in space
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*/
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static inline xfs_dir2_off_t
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xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
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{
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return xfs_dir2_db_off_to_byte(mp, xfs_dir2_da_to_db(mp, da), 0);
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}
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/*
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* Function declarations.
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*/
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extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
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struct xfs_dabuf *dbp);
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extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
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extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
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struct xfs_dabuf *bp);
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extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
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int *lowstalep, int *highstalep,
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int *lowlogp, int *highlogp);
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extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
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struct uio *uio, int *eofp,
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struct xfs_dirent *dbp, xfs_dir2_put_t put);
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extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
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struct xfs_dabuf **bpp, int magic);
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extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
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int first, int last);
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extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
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struct xfs_dabuf *bp);
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extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
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extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
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extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
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extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
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struct xfs_dabuf *lbp);
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extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
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struct xfs_dabuf *lbp, xfs_dir2_db_t db);
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extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
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#endif /* __XFS_DIR2_LEAF_H__ */
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