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_MINBYTES 8
  22 #define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY))
  23
  24 struct gfs2_rgrpd;
  25 struct gfs2_sbd;
  26 struct gfs2_holder;
  27
  28 extern void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd);
  29
  30 extern struct gfs2_rgrpd *gfs2_blk2rgrpd(struct gfs2_sbd *sdp, u64 blk, bool exact);
  31 extern struct gfs2_rgrpd *gfs2_rgrpd_get_first(struct gfs2_sbd *sdp);
  32 extern struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd);
  33
  34 extern void gfs2_clear_rgrpd(struct gfs2_sbd *sdp);
  35 extern int gfs2_rindex_update(struct gfs2_sbd *sdp);
  36 extern void gfs2_free_clones(struct gfs2_rgrpd *rgd);
  37 extern int gfs2_rgrp_go_lock(struct gfs2_holder *gh);
  38 extern void gfs2_rgrp_go_unlock(struct gfs2_holder *gh);
  39
  40 extern struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
  41
  42 extern int gfs2_inplace_reserve(struct gfs2_inode *ip, u32 requested);
  43 extern void gfs2_inplace_release(struct gfs2_inode *ip);
  44
  45 extern int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *n,
  46                              bool dinode, u64 *generation);
  47
  48 extern int gfs2_rs_alloc(struct gfs2_inode *ip);
  49 extern void gfs2_rs_deltree(struct gfs2_blkreserv *rs);
  50 extern void gfs2_rs_delete(struct gfs2_inode *ip);
  51 extern void __gfs2_free_blocks(struct gfs2_inode *ip, u64 bstart, u32 blen, int meta);
  52 extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
  53 extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
  54 extern void gfs2_unlink_di(struct inode *inode);
  55 extern int gfs2_check_blk_type(struct gfs2_sbd *sdp, u64 no_addr,
  56                                unsigned int type);
  57
  58 struct 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
  65 extern void gfs2_rlist_add(struct gfs2_inode *ip, struct gfs2_rgrp_list *rlist,
  66                            u64 block);
  67 extern void gfs2_rlist_alloc(struct gfs2_rgrp_list *rlist, unsigned int state);
  68 extern void gfs2_rlist_free(struct gfs2_rgrp_list *rlist);
  69 extern u64 gfs2_ri_total(struct gfs2_sbd *sdp);
  70 extern int gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl);
  71 extern 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);
  74 extern int gfs2_fitrim(struct file *filp, void __user *argp);
  75
  76 /* This is how to tell if a multi-block reservation is "inplace" reserved: */
  77 static inline int gfs2_mb_reserved(struct gfs2_inode *ip)
  78 {
  79         if (ip->i_res && ip->i_res->rs_requested)
  80                 return 1;
  81         return 0;
  82 }
  83
  84 /* This is how to tell if a multi-block reservation is in the rgrp tree: */
  85 static inline int gfs2_rs_active(struct gfs2_blkreserv *rs)
  86 {
  87         if (rs && rs->rs_bi)
  88                 return 1;
  89         return 0;
  90 }
  91
  92 static inline u32 gfs2_bi2rgd_blk(const struct gfs2_bitmap *bi, u32 blk)
  93 {
  94         return (bi->bi_start * GFS2_NBBY) + blk;
  95 }
  96
  97 static inline u64 gfs2_rs_startblk(const struct gfs2_blkreserv *rs)
  98 {
  99         return gfs2_bi2rgd_blk(rs->rs_bi, rs->rs_biblk) + rs->rs_rgd->rd_data0;
 100 }
 101
 102 #endif /* __RGRP_DOT_H__ */