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linux_dsm_epyc7002/fs/xfs/xfs_dir2_leaf.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

361 lines
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/*
* 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__ */
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