linux/fs/gfs2/rgrp.h
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   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_MINBYTES 8
  22#define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY))
  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_go_unlock(struct gfs2_holder *gh);
  39
  40extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
  41
  42extern int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested);
  43extern void gfs2_inplace_release(struct gfs2_inode *ip);
  44
  45extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
  46                             bool dinode, u64 *generation);
  47
  48extern int gfs2_rs_alloc(struct gfs2_inode *ip);
  49extern void gfs2_rs_deltree(struct gfs2_inode *ip, struct gfs2_blkreserv *rs);
  50extern void gfs2_rs_delete(struct gfs2_inode *ip);
  51extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
  52extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
  53extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
  54extern void gfs2_unlink_di(struct inode *inode);
  55extern int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr,
  56                               unsigned int type);
  57
  58struct gfs2_rgrp_list {
  59        unsigned int rl_rgrps;
  60        unsigned int rl_space;
  61        struct gfs2_rgrpd **rl_rgd;
  62        struct gfs2_holder *rl_ghs;
  63};
  64
  65extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
  66                           u64 block);
  67extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state);
  68extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
  69extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
  70extern int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl);
  71extern int gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
  72                                   struct buffer_head *bh,
  73                                   const struct gfs2_bitmap *bi, unsigned minlen, u64 *ptrimmed);
  74extern int gfs2_fitrim(struct file *filp, void __user *argp);
  75
  76/* This is how to tell if a reservation is in the rgrp tree: */
  77static inline bool gfs2_rs_active(struct gfs2_blkreserv *rs)
  78{
  79        return rs && !RB_EMPTY_NODE(&rs->rs_node);
  80}
  81
  82#endif /* __RGRP_DOT_H__ */
  83
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