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dfe4d34b39
This patch adds read-ahead capability to GFS2's directory hash table management. It greatly improves performance for some directory operations. For example: In one of my file systems that has 1000 directories, each of which has 1000 files, time to execute a recursive ls (time ls -fR /mnt/gfs2 > /dev/null) was reduced from 2m2.814s on a stock kernel to 0m45.938s. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __DIR_DOT_H__
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#define __DIR_DOT_H__
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#include <linux/dcache.h>
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#include <linux/crc32.h>
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struct inode;
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struct gfs2_inode;
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struct gfs2_inum;
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extern struct inode *gfs2_dir_search(struct inode *dir,
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const struct qstr *filename);
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extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
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const struct gfs2_inode *ip);
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extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
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const struct gfs2_inode *ip);
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extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
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extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
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filldir_t filldir, struct file_ra_state *f_ra);
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extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
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const struct gfs2_inode *nip, unsigned int new_type);
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extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
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extern int gfs2_diradd_alloc_required(struct inode *dir,
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const struct qstr *filename);
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extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
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struct buffer_head **bhp);
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extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
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static inline u32 gfs2_disk_hash(const char *data, int len)
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{
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return crc32_le((u32)~0, data, len) ^ (u32)~0;
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}
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static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
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{
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name->name = fname;
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name->len = strlen(fname);
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name->hash = gfs2_disk_hash(name->name, name->len);
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}
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/* N.B. This probably ought to take inum & type as args as well */
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static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
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{
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dent->de_inum.no_addr = cpu_to_be64(0);
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dent->de_inum.no_formal_ino = cpu_to_be64(0);
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dent->de_hash = cpu_to_be32(name->hash);
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dent->de_rec_len = cpu_to_be16(reclen);
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dent->de_name_len = cpu_to_be16(name->len);
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dent->de_type = cpu_to_be16(0);
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memset(dent->__pad, 0, sizeof(dent->__pad));
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memcpy(dent + 1, name->name, name->len);
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}
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extern struct qstr gfs2_qdot;
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extern struct qstr gfs2_qdotdot;
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#endif /* __DIR_DOT_H__ */
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