mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
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
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef __DIR_DOT_H__
|
|
#define __DIR_DOT_H__
|
|
|
|
#include <linux/dcache.h>
|
|
#include <linux/crc32.h>
|
|
|
|
struct inode;
|
|
struct gfs2_inode;
|
|
struct gfs2_inum;
|
|
|
|
extern struct inode *gfs2_dir_search(struct inode *dir,
|
|
const struct qstr *filename);
|
|
extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
|
|
const struct gfs2_inode *ip);
|
|
extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
|
|
const struct gfs2_inode *ip);
|
|
extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
|
|
extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
|
|
filldir_t filldir, struct file_ra_state *f_ra);
|
|
extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
|
|
const struct gfs2_inode *nip, unsigned int new_type);
|
|
|
|
extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
|
|
|
|
extern int gfs2_diradd_alloc_required(struct inode *dir,
|
|
const struct qstr *filename);
|
|
extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
|
|
struct buffer_head **bhp);
|
|
extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
|
|
|
|
static inline u32 gfs2_disk_hash(const char *data, int len)
|
|
{
|
|
return crc32_le((u32)~0, data, len) ^ (u32)~0;
|
|
}
|
|
|
|
|
|
static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
|
|
{
|
|
name->name = fname;
|
|
name->len = strlen(fname);
|
|
name->hash = gfs2_disk_hash(name->name, name->len);
|
|
}
|
|
|
|
/* N.B. This probably ought to take inum & type as args as well */
|
|
static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
|
|
{
|
|
dent->de_inum.no_addr = cpu_to_be64(0);
|
|
dent->de_inum.no_formal_ino = cpu_to_be64(0);
|
|
dent->de_hash = cpu_to_be32(name->hash);
|
|
dent->de_rec_len = cpu_to_be16(reclen);
|
|
dent->de_name_len = cpu_to_be16(name->len);
|
|
dent->de_type = cpu_to_be16(0);
|
|
memset(dent->__pad, 0, sizeof(dent->__pad));
|
|
memcpy(dent + 1, name->name, name->len);
|
|
}
|
|
|
|
extern struct qstr gfs2_qdot;
|
|
extern struct qstr gfs2_qdotdot;
|
|
|
|
#endif /* __DIR_DOT_H__ */
|