mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 09:14:19 +08:00
8e2e004735
This patch reduces GFS2 file fragmentation by pre-reserving blocks. The resulting improved on disk layout greatly speeds up operations in cases which would have resulted in interlaced allocation of blocks previously. A typical example of this is 10 parallel dd processes, each writing to a file in a common dirctory. The implementation uses an rbtree of reservations attached to each resource group (and each inode). Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2008 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 __RGRP_DOT_H__
|
|
#define __RGRP_DOT_H__
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
/* Since each block in the file system is represented by two bits in the
|
|
* bitmap, one 64-bit word in the bitmap will represent 32 blocks.
|
|
* By reserving 32 blocks at a time, we can optimize / shortcut how we search
|
|
* through the bitmaps by looking a word at a time.
|
|
*/
|
|
#define RGRP_RSRV_MINBYTES 8
|
|
#define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY))
|
|
|
|
struct gfs2_rgrpd;
|
|
struct gfs2_sbd;
|
|
struct gfs2_holder;
|
|
|
|
extern void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd);
|
|
|
|
extern struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact);
|
|
extern struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp);
|
|
extern struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd);
|
|
|
|
extern void gfs2_clear_rgrpd(struct gfs2_sbd *sdp);
|
|
extern int gfs2_rindex_update(struct gfs2_sbd *sdp);
|
|
extern void gfs2_free_clones(struct gfs2_rgrpd *rgd);
|
|
extern int gfs2_rgrp_go_lock(struct gfs2_holder *gh);
|
|
extern void gfs2_rgrp_go_unlock(struct gfs2_holder *gh);
|
|
|
|
extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
|
|
|
|
extern int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested);
|
|
extern void gfs2_inplace_release(struct gfs2_inode *ip);
|
|
|
|
extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
|
|
bool dinode, u64 *generation);
|
|
|
|
extern int gfs2_rs_alloc(struct gfs2_inode *ip);
|
|
extern void gfs2_rs_deltree(struct gfs2_blkreserv *rs);
|
|
extern void gfs2_rs_delete(struct gfs2_inode *ip);
|
|
extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
|
|
extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
|
|
extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
|
|
extern void gfs2_unlink_di(struct inode *inode);
|
|
extern int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr,
|
|
unsigned int type);
|
|
|
|
struct gfs2_rgrp_list {
|
|
unsigned int rl_rgrps;
|
|
unsigned int rl_space;
|
|
struct gfs2_rgrpd **rl_rgd;
|
|
struct gfs2_holder *rl_ghs;
|
|
};
|
|
|
|
extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
|
|
u64 block);
|
|
extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state);
|
|
extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
|
|
extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
|
|
extern int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl);
|
|
extern int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
|
|
struct buffer_head *bh,
|
|
const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed);
|
|
extern int gfs2_fitrim(struct file *filp, void __user *argp);
|
|
|
|
/* This is how to tell if a multi-block reservation is "inplace" reserved: */
|
|
static inline int gfs2_mb_reserved(struct gfs2_inode *ip)
|
|
{
|
|
if (ip->i_res && ip->i_res->rs_requested)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* This is how to tell if a multi-block reservation is in the rgrp tree: */
|
|
static inline int gfs2_rs_active(struct gfs2_blkreserv *rs)
|
|
{
|
|
if (rs && rs->rs_bi)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline u32 gfs2_bi2rgd_blk(const struct gfs2_bitmap *bi, u32 blk)
|
|
{
|
|
return (bi->bi_start * GFS2_NBBY) + blk;
|
|
}
|
|
|
|
static inline u64 gfs2_rs_startblk(const struct gfs2_blkreserv *rs)
|
|
{
|
|
return gfs2_bi2rgd_blk(rs->rs_bi, rs->rs_biblk) + rs->rs_rgd->rd_data0;
|
|
}
|
|
|
|
#endif /* __RGRP_DOT_H__ */
|