141 lines
4.9 KiB
C
141 lines
4.9 KiB
C
/*
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* Copyright (c) 2000,2005 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_DIR_H__
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#define __XFS_DIR_H__
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/*
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* Large directories are structured around Btrees where all the data
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* elements are in the leaf nodes. Filenames are hashed into an int,
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* then that int is used as the index into the Btree. Since the hashval
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* of a filename may not be unique, we may have duplicate keys. The
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* internal links in the Btree are logical block offsets into the file.
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*
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* Small directories use a different format and are packed as tightly
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* as possible so as to fit into the literal area of the inode.
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*/
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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struct uio;
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struct xfs_bmap_free;
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struct xfs_da_args;
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struct xfs_dinode;
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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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* Directory function types.
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* Put in structures (xfs_dirops_t) for v1 and v2 directories.
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*/
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typedef void (*xfs_dir_mount_t)(struct xfs_mount *mp);
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typedef int (*xfs_dir_isempty_t)(struct xfs_inode *dp);
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typedef int (*xfs_dir_init_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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struct xfs_inode *pdp);
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typedef int (*xfs_dir_createname_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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char *name,
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int namelen,
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xfs_ino_t inum,
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xfs_fsblock_t *first,
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struct xfs_bmap_free *flist,
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xfs_extlen_t total);
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typedef int (*xfs_dir_lookup_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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char *name,
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int namelen,
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xfs_ino_t *inum);
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typedef int (*xfs_dir_removename_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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char *name,
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int namelen,
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xfs_ino_t ino,
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xfs_fsblock_t *first,
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struct xfs_bmap_free *flist,
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xfs_extlen_t total);
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typedef int (*xfs_dir_getdents_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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struct uio *uio,
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int *eofp);
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typedef int (*xfs_dir_replace_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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char *name,
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int namelen,
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xfs_ino_t inum,
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xfs_fsblock_t *first,
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struct xfs_bmap_free *flist,
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xfs_extlen_t total);
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typedef int (*xfs_dir_canenter_t)(struct xfs_trans *tp,
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struct xfs_inode *dp,
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char *name,
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int namelen);
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typedef int (*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
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struct xfs_dinode *dip);
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typedef int (*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);
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typedef struct xfs_dirops {
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xfs_dir_mount_t xd_mount;
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xfs_dir_isempty_t xd_isempty;
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xfs_dir_init_t xd_init;
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xfs_dir_createname_t xd_createname;
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xfs_dir_lookup_t xd_lookup;
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xfs_dir_removename_t xd_removename;
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xfs_dir_getdents_t xd_getdents;
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xfs_dir_replace_t xd_replace;
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xfs_dir_canenter_t xd_canenter;
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xfs_dir_shortform_validate_ondisk_t xd_shortform_validate_ondisk;
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xfs_dir_shortform_to_single_t xd_shortform_to_single;
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} xfs_dirops_t;
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/*
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* Overall external interface routines.
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*/
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void xfs_dir_startup(void); /* called exactly once */
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#define XFS_DIR_MOUNT(mp) \
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((mp)->m_dirops.xd_mount(mp))
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#define XFS_DIR_ISEMPTY(mp,dp) \
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((mp)->m_dirops.xd_isempty(dp))
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#define XFS_DIR_INIT(mp,tp,dp,pdp) \
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((mp)->m_dirops.xd_init(tp,dp,pdp))
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#define XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
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((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
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total))
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#define XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum) \
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((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
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#define XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total) \
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((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
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#define XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp) \
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((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
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#define XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total) \
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((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
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#define XFS_DIR_CANENTER(mp,tp,dp,name,namelen) \
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((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
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#define XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip) \
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((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
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#define XFS_DIR_SHORTFORM_TO_SINGLE(mp,args) \
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((mp)->m_dirops.xd_shortform_to_single(args))
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#define XFS_DIR_IS_V1(mp) ((mp)->m_dirversion == 1)
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extern xfs_dirops_t xfsv1_dirops;
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#endif /* __XFS_DIR_H__ */
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