94 lines
3.4 KiB
C
94 lines
3.4 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_BLOCK_H__
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#define __XFS_DIR2_BLOCK_H__
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/*
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* Directory version 2, single block format structures.
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*
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* The single block format looks like the following drawing on disk:
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*
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* +-------------------------------------------------+
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* | xfs_dir2_data_hdr_t |
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* +-------------------------------------------------+
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* | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t |
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* | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t |
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* | xfs_dir2_data_entry_t OR xfs_dir2_data_unused_t |
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* | ... |
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* +-------------------------------------------------+
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* | unused space |
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* +-------------------------------------------------+
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* | ... |
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* | xfs_dir2_leaf_entry_t |
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* | xfs_dir2_leaf_entry_t |
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* +-------------------------------------------------+
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* | xfs_dir2_block_tail_t |
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* +-------------------------------------------------+
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*
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* As all the entries are variable size structures the accessors in this
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* file and xfs_dir2_data.h should be used to iterate over them.
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*/
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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_dir2_data_hdr;
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struct xfs_dir2_leaf_entry;
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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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#define XFS_DIR2_BLOCK_MAGIC 0x58443242 /* XD2B: for one block dirs */
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typedef struct xfs_dir2_block_tail {
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__be32 count; /* count of leaf entries */
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__be32 stale; /* count of stale lf entries */
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} xfs_dir2_block_tail_t;
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/*
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* Pointer to the leaf header embedded in a data block (1-block format)
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*/
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static inline xfs_dir2_block_tail_t *
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xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_data_hdr_t *hdr)
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{
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return ((xfs_dir2_block_tail_t *)((char *)hdr + mp->m_dirblksize)) - 1;
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}
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/*
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* Pointer to the leaf entries embedded in a data block (1-block format)
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*/
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static inline struct xfs_dir2_leaf_entry *
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xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
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{
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return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);
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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_addname(struct xfs_da_args *args);
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extern int xfs_dir2_block_getdents(struct xfs_inode *dp, void *dirent,
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xfs_off_t *offset, filldir_t filldir);
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extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
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extern int xfs_dir2_block_removename(struct xfs_da_args *args);
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extern int xfs_dir2_block_replace(struct xfs_da_args *args);
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extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
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struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
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extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
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#endif /* __XFS_DIR2_BLOCK_H__ */
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