linux/fs/nilfs2/sufile.h
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   1/*
   2 * sufile.h - NILFS segment usage file.
   3 *
   4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 *
  20 * Written by Koji Sato <koji@osrg.net>.
  21 */
  22
  23#ifndef _NILFS_SUFILE_H
  24#define _NILFS_SUFILE_H
  25
  26#include <linux/fs.h>
  27#include <linux/buffer_head.h>
  28#include <linux/nilfs2_fs.h>
  29#include "mdt.h"
  30
  31
  32static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
  33{
  34        return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
  35}
  36
  37unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
  38
  39int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
  40int nilfs_sufile_alloc(struct inode *, __u64 *);
  41int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
  42int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
  43                                   unsigned long nblocks, time_t modtime);
  44int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
  45ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
  46                                size_t);
  47
  48int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
  49                         void (*dofunc)(struct inode *, __u64,
  50                                        struct buffer_head *,
  51                                        struct buffer_head *));
  52int nilfs_sufile_update(struct inode *, __u64, int,
  53                        void (*dofunc)(struct inode *, __u64,
  54                                       struct buffer_head *,
  55                                       struct buffer_head *));
  56void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
  57                           struct buffer_head *);
  58void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
  59                          struct buffer_head *);
  60void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
  61                                 struct buffer_head *);
  62void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
  63                               struct buffer_head *);
  64
  65int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
  66int nilfs_sufile_read(struct super_block *sb, size_t susize,
  67                      struct nilfs_inode *raw_inode, struct inode **inodep);
  68
  69/**
  70 * nilfs_sufile_scrap - make a segment garbage
  71 * @sufile: inode of segment usage file
  72 * @segnum: segment number to be freed
  73 */
  74static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
  75{
  76        return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
  77}
  78
  79/**
  80 * nilfs_sufile_free - free segment
  81 * @sufile: inode of segment usage file
  82 * @segnum: segment number to be freed
  83 */
  84static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
  85{
  86        return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
  87}
  88
  89/**
  90 * nilfs_sufile_freev - free segments
  91 * @sufile: inode of segment usage file
  92 * @segnumv: array of segment numbers
  93 * @nsegs: size of @segnumv array
  94 * @ndone: place to store the number of freed segments
  95 */
  96static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
  97                                     size_t nsegs, size_t *ndone)
  98{
  99        return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
 100                                    nilfs_sufile_do_free);
 101}
 102
 103/**
 104 * nilfs_sufile_cancel_freev - reallocate freeing segments
 105 * @sufile: inode of segment usage file
 106 * @segnumv: array of segment numbers
 107 * @nsegs: size of @segnumv array
 108 * @ndone: place to store the number of cancelled segments
 109 *
 110 * Return Value: On success, 0 is returned. On error, a negative error codes
 111 * is returned.
 112 */
 113static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
 114                                            __u64 *segnumv, size_t nsegs,
 115                                            size_t *ndone)
 116{
 117        return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
 118                                    nilfs_sufile_do_cancel_free);
 119}
 120
 121/**
 122 * nilfs_sufile_set_error - mark a segment as erroneous
 123 * @sufile: inode of segment usage file
 124 * @segnum: segment number
 125 *
 126 * Description: nilfs_sufile_set_error() marks the segment specified by
 127 * @segnum as erroneous. The error segment will never be used again.
 128 *
 129 * Return Value: On success, 0 is returned. On error, one of the following
 130 * negative error codes is returned.
 131 *
 132 * %-EIO - I/O error.
 133 *
 134 * %-ENOMEM - Insufficient amount of memory available.
 135 *
 136 * %-EINVAL - Invalid segment usage number.
 137 */
 138static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
 139{
 140        return nilfs_sufile_update(sufile, segnum, 0,
 141                                   nilfs_sufile_do_set_error);
 142}
 143
 144#endif  /* _NILFS_SUFILE_H */
 145
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