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 #define NILFS_SUFILE_GFP NILFS_MDT_GFP 32 33 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile) 34 { 35 return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments; 36 } 37 38 int nilfs_sufile_alloc(struct inode *, __u64 *); 39 int nilfs_sufile_get_segment_usage(struct inode *, __u64, 40 struct nilfs_segment_usage **, 41 struct buffer_head **); 42 void nilfs_sufile_put_segment_usage(struct inode *, __u64, 43 struct buffer_head *); 44 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *); 45 int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *); 46 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, 47 size_t); 48 49 int nilfs_sufile_update(struct inode *, __u64, int, 50 void (*dofunc)(struct inode *, __u64, 51 struct buffer_head *, 52 struct buffer_head *)); 53 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, 54 struct buffer_head *); 55 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, 56 struct buffer_head *); 57 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, 58 struct buffer_head *); 59 60 /** 61 * nilfs_sufile_cancel_free - 62 * @sufile: inode of segment usage file 63 * @segnum: segment number 64 * 65 * Description: 66 * 67 * Return Value: On success, 0 is returned. On error, one of the following 68 * negative error codes is returned. 69 * 70 * %-EIO - I/O error. 71 * 72 * %-ENOMEM - Insufficient amount of memory available. 73 */ 74 static inline int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum) 75 { 76 return nilfs_sufile_update(sufile, segnum, 0, 77 nilfs_sufile_do_cancel_free); 78 } 79 80 /** 81 * nilfs_sufile_free - free segment 82 * @sufile: inode of segment usage file 83 * @segnum: segment number to be freed 84 */ 85 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum) 86 { 87 return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free); 88 } 89 90 /** 91 * nilfs_sufile_set_error - mark a segment as erroneous 92 * @sufile: inode of segment usage file 93 * @segnum: segment number 94 * 95 * Description: nilfs_sufile_set_error() marks the segment specified by 96 * @segnum as erroneous. The error segment will never be used again. 97 * 98 * Return Value: On success, 0 is returned. On error, one of the following 99 * negative error codes is returned. 100 * 101 * %-EIO - I/O error. 102 * 103 * %-ENOMEM - Insufficient amount of memory available. 104 * 105 * %-EINVAL - Invalid segment usage number. 106 */ 107 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum) 108 { 109 return nilfs_sufile_update(sufile, segnum, 0, 110 nilfs_sufile_do_set_error); 111 } 112 113 #endif /* _NILFS_SUFILE_H */ 114