LXR linux/fs/gfs2/rgrp.h

   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __RGRP_DOT_H__
  11#define __RGRP_DOT_H__
  12
  13#include <linux/slab.h>
  14#include <linux/uaccess.h>
  15
  16/* Since each block in the file system is represented by two bits in the
  17 * bitmap, one 64-bit word in the bitmap will represent 32 blocks.
  18 * By reserving 32 blocks at a time, we can optimize / shortcut how we search
  19 * through the bitmaps by looking a word at a time.
  20 */
  21#define RGRP_RSRV_MINBLKS 32
  22#define RGRP_RSRV_ADDBLKS 64
  23
  24struct gfs2_rgrpd;
  25struct gfs2_sbd;
  26struct gfs2_holder;
  27
  28extern void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd);
  29
  30extern struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact);
  31extern struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp);
  32extern struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd);
  33
  34extern void gfs2_clear_rgrpd(struct gfs2_sbd *sdp);
  35extern int gfs2_rindex_update(struct gfs2_sbd *sdp);
  36extern void gfs2_free_clones(struct gfs2_rgrpd *rgd);
  37extern int gfs2_rgrp_go_lock(struct gfs2_holder *gh);
  38extern void gfs2_rgrp_brelse(struct gfs2_rgrpd *rgd);
  39extern void gfs2_rgrp_go_unlock(struct gfs2_holder *gh);
  40
  41extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
  42
  43#define GFS2_AF_ORLOV 1
  44extern int gfs2_inplace_reserve(struct gfs2_inode *ip,
  45                                struct gfs2_alloc_parms *ap);
  46extern void gfs2_inplace_release(struct gfs2_inode *ip);
  47
  48extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
  49                             bool dinode, u64 *generation);
  50
  51extern int gfs2_rsqa_alloc(struct gfs2_inode *ip);
  52extern void gfs2_rs_deltree(struct gfs2_blkreserv *rs);
  53extern void gfs2_rsqa_delete(struct gfs2_inode *ip, atomic_t *wcount);
  54extern void __gfs2_free_blocks(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
  55                               u64 bstart, u32 blen, int meta);
  56extern void gfs2_free_meta(struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
  57                           u64 bstart, u32 blen);
  58extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
  59extern void gfs2_unlink_di(struct inode *inode);
  60extern int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr,
  61                               unsigned int type);
  62
  63struct gfs2_rgrp_list {
  64        unsigned int rl_rgrps;
  65        unsigned int rl_space;
  66        struct gfs2_rgrpd **rl_rgd;
  67        struct gfs2_holder *rl_ghs;
  68};
  69
  70extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
  71                           u64 block);
  72extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist);
  73extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
  74extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
  75extern void gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl);
  76extern int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
  77                                   struct buffer_head *bh,
  78                                   const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed);
  79extern int gfs2_fitrim(struct file *filp, void __user *argp);
  80
  81/* This is how to tell if a reservation is in the rgrp tree: */
  82static inline bool gfs2_rs_active(const struct gfs2_blkreserv *rs)
  83{
  84        return rs && !RB_EMPTY_NODE(&rs->rs_node);
  85}
  86
  87static inline int rgrp_contains_block(struct gfs2_rgrpd *rgd, u64 block)
  88{
  89        u64 first = rgd->rd_data0;
  90        u64 last = first + rgd->rd_data;
  91        return first <= block && block < last;
  92}
  93
  94extern void check_and_update_goal(struct gfs2_inode *ip);
  95#endif /* __RGRP_DOT_H__ */
  96