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 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned , size_t); 48 49 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *, 50 void (*dofunc)(struct inode *, __u64, 51 struct buffer_head *, 52 struct buffer_head *)); 53 int nilfs_sufile_update(struct inode *, __u64, int, 54 void (*dofunc)(struct inode *, __u64, 55 struct buffer_head *, 56 struct buffer_head *)); 57 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *, 58 struct buffer_head *); 59 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, 60 struct buffer_head *); 61 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, 62 struct buffer_head *); 63 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, 64 struct buffer_head *); 65 66 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs); 67 int nilfs_sufile_read(struct super_block *sb, size_t susize, 68 struct nilfs_inode *raw_inode, struct inode **inodep); 69 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range); 70 71 /** 72 * nilfs_sufile_scrap - make a segment garbage 73 * @sufile: inode of segment usage file 74 * @segnum: segment number to be freed 75 */ 76 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum) 77 { 78 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap); 79 } 80 81 /** 82 * nilfs_sufile_free - free segment 83 * @sufile: inode of segment usage file 84 * @segnum: segment number to be freed 85 */ 86 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum) 87 { 88 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free); 89 } 90 91 /** 92 * nilfs_sufile_freev - free segments 93 * @sufile: inode of segment usage file 94 * @segnumv: array of segment numbers 95 * @nsegs: size of @segnumv array 96 * @ndone: place to store the number of freed segments 97 */ 98 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv, 99 size_t nsegs, size_t *ndone) 100 { 101 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, 102 nilfs_sufile_do_free); 103 } 104 105 /** 106 * nilfs_sufile_cancel_freev - reallocate freeing segments 107 * @sufile: inode of segment usage file 108 * @segnumv: array of segment numbers 109 * @nsegs: size of @segnumv array 110 * @ndone: place to store the number of cancelled segments 111 * 112 * Return Value: On success, 0 is returned. On error, a negative error codes 113 * is returned. 114 */ 115 static inline int nilfs_sufile_cancel_freev(struct inode *sufile, 116 __u64 *segnumv, size_t nsegs, 117 size_t *ndone) 118 { 119 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, 120 nilfs_sufile_do_cancel_free); 121 } 122 123 /** 124 * nilfs_sufile_set_error - mark a segment as erroneous 125 * @sufile: inode of segment usage file 126 * @segnum: segment number 127 * 128 * Description: nilfs_sufile_set_error() marks the segment specified by 129 * @segnum as erroneous. The error segment will never be used again. 130 * 131 * Return Value: On success, 0 is returned. On error, one of the following 132 * negative error codes is returned. 133 * 134 * %-EIO - I/O error. 135 * 136 * %-ENOMEM - Insufficient amount of memory available. 137 * 138 * %-EINVAL - Invalid segment usage number. 139 */ 140 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum) 141 { 142 return nilfs_sufile_update(sufile, segnum, 0, 143 nilfs_sufile_do_set_error); 144 } 145 146 #endif /* _NILFS_SUFILE_H */ 147