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_MDT(sufile)->mi_nilfs->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 inode *sufile, struct nilfs_inode *raw_inode); 65 struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize); 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 */ 143