Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 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 *); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 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 *); |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 46 | ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, |
| 47 | size_t); |
| 48 | |
Ryusuke Konishi | dda54f4 | 2009-05-16 21:49:10 +0900 | [diff] [blame] | 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 *)); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 53 | int nilfs_sufile_update(struct inode *, __u64, int, |
| 54 | void (*dofunc)(struct inode *, __u64, |
| 55 | struct buffer_head *, |
| 56 | struct buffer_head *)); |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 57 | void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *, |
| 58 | struct buffer_head *); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 59 | void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, |
| 60 | struct buffer_head *); |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 61 | void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, |
| 62 | struct buffer_head *); |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 63 | void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, |
| 64 | struct buffer_head *); |
| 65 | |
| 66 | /** |
Ryusuke Konishi | c85399c | 2009-04-05 18:30:58 +0900 | [diff] [blame] | 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 | /** |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 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 | /** |
Ryusuke Konishi | 071cb4b | 2009-05-16 23:44:55 +0900 | [diff] [blame] | 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 | /** |
Ryusuke Konishi | a703018 | 2009-04-05 18:24:11 +0900 | [diff] [blame] | 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 | } |
Koji Sato | 6c98cd4 | 2009-04-06 19:01:32 -0700 | [diff] [blame] | 140 | |
| 141 | #endif /* _NILFS_SUFILE_H */ |