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 * Written by Koji Sato. 17 */ 18 19 #ifndef _NILFS_SUFILE_H 20 #define _NILFS_SUFILE_H 21 22 #include <linux/fs.h> 23 #include <linux/buffer_head.h> 24 #include "mdt.h" 25 26 27 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile) 28 { 29 return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments; 30 } 31 32 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile); 33 34 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end); 35 int nilfs_sufile_alloc(struct inode *, __u64 *); 36 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum); 37 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, 38 unsigned long nblocks, time64_t modtime); 39 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *); 40 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int, 41 size_t); 42 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t); 43 44 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *, 45 void (*dofunc)(struct inode *, __u64, 46 struct buffer_head *, 47 struct buffer_head *)); 48 int nilfs_sufile_update(struct inode *, __u64, int, 49 void (*dofunc)(struct inode *, __u64, 50 struct buffer_head *, 51 struct buffer_head *)); 52 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *, 53 struct buffer_head *); 54 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, 55 struct buffer_head *); 56 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, 57 struct buffer_head *); 58 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, 59 struct buffer_head *); 60 61 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs); 62 int nilfs_sufile_read(struct super_block *sb, size_t susize, 63 struct nilfs_inode *raw_inode, struct inode **inodep); 64 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range); 65 66 /** 67 * nilfs_sufile_scrap - make a segment garbage 68 * @sufile: inode of segment usage file 69 * @segnum: segment number to be freed 70 */ 71 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum) 72 { 73 return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap); 74 } 75 76 /** 77 * nilfs_sufile_free - free segment 78 * @sufile: inode of segment usage file 79 * @segnum: segment number to be freed 80 */ 81 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum) 82 { 83 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free); 84 } 85 86 /** 87 * nilfs_sufile_freev - free segments 88 * @sufile: inode of segment usage file 89 * @segnumv: array of segment numbers 90 * @nsegs: size of @segnumv array 91 * @ndone: place to store the number of freed segments 92 */ 93 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv, 94 size_t nsegs, size_t *ndone) 95 { 96 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, 97 nilfs_sufile_do_free); 98 } 99 100 /** 101 * nilfs_sufile_cancel_freev - reallocate freeing segments 102 * @sufile: inode of segment usage file 103 * @segnumv: array of segment numbers 104 * @nsegs: size of @segnumv array 105 * @ndone: place to store the number of cancelled segments 106 * 107 * Return Value: On success, 0 is returned. On error, a negative error codes 108 * is returned. 109 */ 110 static inline int nilfs_sufile_cancel_freev(struct inode *sufile, 111 __u64 *segnumv, size_t nsegs, 112 size_t *ndone) 113 { 114 return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, 115 nilfs_sufile_do_cancel_free); 116 } 117 118 /** 119 * nilfs_sufile_set_error - mark a segment as erroneous 120 * @sufile: inode of segment usage file 121 * @segnum: segment number 122 * 123 * Description: nilfs_sufile_set_error() marks the segment specified by 124 * @segnum as erroneous. The error segment will never be used again. 125 * 126 * Return Value: On success, 0 is returned. On error, one of the following 127 * negative error codes is returned. 128 * 129 * %-EIO - I/O error. 130 * 131 * %-ENOMEM - Insufficient amount of memory available. 132 * 133 * %-EINVAL - Invalid segment usage number. 134 */ 135 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum) 136 { 137 return nilfs_sufile_update(sufile, segnum, 0, 138 nilfs_sufile_do_set_error); 139 } 140 141 #endif /* _NILFS_SUFILE_H */ 142