e7c17e4309
The only operation which doesn't get faster with directory indexing is insert, which still has to walk the entire unindexed directory portion to find a free block. This patch provides an improvement in directory insert performance by maintaining a singly linked list of directory leaf blocks which have space for additional dirents. Signed-off-by: Mark Fasheh <mfasheh@suse.com> Acked-by: Joel Becker <joel.becker@oracle.com>
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* dir.h
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*
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* Function prototypes
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*
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* Copyright (C) 2002, 2004 Oracle. 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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_DIR_H
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#define OCFS2_DIR_H
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struct ocfs2_dx_hinfo {
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u32 major_hash;
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u32 minor_hash;
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};
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struct ocfs2_dir_lookup_result {
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struct buffer_head *dl_leaf_bh; /* Unindexed leaf
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* block */
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struct ocfs2_dir_entry *dl_entry; /* Target dirent in
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* unindexed leaf */
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struct buffer_head *dl_dx_root_bh; /* Root of indexed
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* tree */
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struct buffer_head *dl_dx_leaf_bh; /* Indexed leaf block */
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struct ocfs2_dx_entry *dl_dx_entry; /* Target dx_entry in
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* indexed leaf */
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struct ocfs2_dx_hinfo dl_hinfo; /* Name hash results */
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struct buffer_head *dl_prev_leaf_bh;/* Previous entry in
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* dir free space
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* list. NULL if
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* previous entry is
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* dx root block. */
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};
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void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
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int ocfs2_find_entry(const char *name, int namelen,
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struct inode *dir,
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struct ocfs2_dir_lookup_result *lookup);
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int ocfs2_delete_entry(handle_t *handle,
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struct inode *dir,
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struct ocfs2_dir_lookup_result *res);
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int __ocfs2_add_entry(handle_t *handle,
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struct inode *dir,
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const char *name, int namelen,
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struct inode *inode, u64 blkno,
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struct buffer_head *parent_fe_bh,
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struct ocfs2_dir_lookup_result *lookup);
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static inline int ocfs2_add_entry(handle_t *handle,
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struct dentry *dentry,
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struct inode *inode, u64 blkno,
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struct buffer_head *parent_fe_bh,
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struct ocfs2_dir_lookup_result *lookup)
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{
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return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
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dentry->d_name.name, dentry->d_name.len,
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inode, blkno, parent_fe_bh, lookup);
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}
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int ocfs2_update_entry(struct inode *dir, handle_t *handle,
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struct ocfs2_dir_lookup_result *res,
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struct inode *new_entry_inode);
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int ocfs2_check_dir_for_entry(struct inode *dir,
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const char *name,
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int namelen);
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int ocfs2_empty_dir(struct inode *inode);
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int ocfs2_find_files_on_disk(const char *name,
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int namelen,
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u64 *blkno,
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struct inode *inode,
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struct ocfs2_dir_lookup_result *res);
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int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
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int namelen, u64 *blkno);
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int ocfs2_readdir(struct file *filp, void *dirent, filldir_t filldir);
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int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
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filldir_t filldir);
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int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
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struct inode *dir,
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struct buffer_head *parent_fe_bh,
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const char *name,
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int namelen,
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struct ocfs2_dir_lookup_result *lookup);
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struct ocfs2_alloc_context;
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int ocfs2_fill_new_dir(struct ocfs2_super *osb,
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handle_t *handle,
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struct inode *parent,
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struct inode *inode,
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struct buffer_head *fe_bh,
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struct ocfs2_alloc_context *data_ac,
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struct ocfs2_alloc_context *meta_ac);
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int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);
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struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
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void *data);
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#endif /* OCFS2_DIR_H */
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