fs/nilfs2/sufile.h

   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
  32 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
  33 {
  34         return NILFS_I_NILFS(sufile)->ns_nsegments;
  35 }
  36
  37 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
  38
  39 int nilfs_sufile_alloc(struct inode *, __u64 *);
  40 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
  41 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
  42                                    unsigned long nblocks, time_t modtime);
  43 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
  44 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
  45                                 size_t);
  46
  47 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
  48                          void (*dofunc)(struct inode *, __u64,
  49                                         struct buffer_head *,
  50                                         struct buffer_head *));
  51 int nilfs_sufile_update(struct inode *, __u64, int,
  52                         void (*dofunc)(struct inode *, __u64,
  53                                        struct buffer_head *,
  54                                        struct buffer_head *));
  55 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
  56                            struct buffer_head *);
  57 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
  58                           struct buffer_head *);
  59 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
  60                                  struct buffer_head *);
  61 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
  62                                struct buffer_head *);
  63
  64 int nilfs_sufile_read(struct super_block *sb, size_t susize,
  65                       struct nilfs_inode *raw_inode, struct inode **inodep);
  66
  67 /**
  68  * nilfs_sufile_scrap - make a segment garbage
  69  * @sufile: inode of segment usage file
  70  * @segnum: segment number to be freed
  71  */
  72 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
  73 {
  74         return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
  75 }
  76
  77 /**
  78  * nilfs_sufile_free - free segment
  79  * @sufile: inode of segment usage file
  80  * @segnum: segment number to be freed
  81  */
  82 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
  83 {
  84         return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
  85 }
  86
  87 /**
  88  * nilfs_sufile_freev - free segments
  89  * @sufile: inode of segment usage file
  90  * @segnumv: array of segment numbers
  91  * @nsegs: size of @segnumv array
  92  * @ndone: place to store the number of freed segments
  93  */
  94 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
  95                                      size_t nsegs, size_t *ndone)
  96 {
  97         return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
  98                                     nilfs_sufile_do_free);
  99 }
 100
 101 /**
 102  * nilfs_sufile_cancel_freev - reallocate freeing segments
 103  * @sufile: inode of segment usage file
 104  * @segnumv: array of segment numbers
 105  * @nsegs: size of @segnumv array
 106  * @ndone: place to store the number of cancelled segments
 107  *
 108  * Return Value: On success, 0 is returned. On error, a negative error codes
 109  * is returned.
 110  */
 111 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
 112                                             __u64 *segnumv, size_t nsegs,
 113                                             size_t *ndone)
 114 {
 115         return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
 116                                     nilfs_sufile_do_cancel_free);
 117 }
 118
 119 /**
 120  * nilfs_sufile_set_error - mark a segment as erroneous
 121  * @sufile: inode of segment usage file
 122  * @segnum: segment number
 123  *
 124  * Description: nilfs_sufile_set_error() marks the segment specified by
 125  * @segnum as erroneous. The error segment will never be used again.
 126  *
 127  * Return Value: On success, 0 is returned. On error, one of the following
 128  * negative error codes is returned.
 129  *
 130  * %-EIO - I/O error.
 131  *
 132  * %-ENOMEM - Insufficient amount of memory available.
 133  *
 134  * %-EINVAL - Invalid segment usage number.
 135  */
 136 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
 137 {
 138         return nilfs_sufile_update(sufile, segnum, 0,
 139                                    nilfs_sufile_do_set_error);
 140 }
 141
 142 #endif  /* _NILFS_SUFILE_H */