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 ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments; 35 } 36 37 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile); 38 39 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end); 40 int nilfs_sufile_alloc(struct inode *, __u64 *); 41 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum); 42 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, 43 unsigned long nblocks, time_t modtime); 44 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *); 45 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned, 46 size_t); 47 48 int 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 *)); 52 int nilfs_sufile_update(struct inode *, __u64, int, 53 void (*dofunc)(struct inode *, __u64, 54 struct buffer_head *, 55 struct buffer_head *)); 56 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *, 57 struct buffer_head *); 58 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, 59 struct buffer_head *); 60 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, 61 struct buffer_head *); 62 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, 63 struct buffer_head *); 64 65 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs); 66 int 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 */ 74 static 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 */ 84 static 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 */ 96 static 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 */ 113 static 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 */ 138 static 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