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Diffstat (limited to 'fs/nilfs2/sufile.h')
| -rw-r--r-- | fs/nilfs2/sufile.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h new file mode 100644 index 000000000000..a2e2efd4ade1 --- /dev/null +++ b/fs/nilfs2/sufile.h @@ -0,0 +1,125 @@ +/* + * sufile.h - NILFS segment usage file. + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Koji Sato <koji@osrg.net>. + */ + +#ifndef _NILFS_SUFILE_H +#define _NILFS_SUFILE_H + +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include <linux/nilfs2_fs.h> +#include "mdt.h" + +#define NILFS_SUFILE_GFP NILFS_MDT_GFP + +static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile) +{ + return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments; +} + +int nilfs_sufile_alloc(struct inode *, __u64 *); +int nilfs_sufile_get_segment_usage(struct inode *, __u64, + struct nilfs_segment_usage **, + struct buffer_head **); +void nilfs_sufile_put_segment_usage(struct inode *, __u64, + struct buffer_head *); +int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *); +int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *); +ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *, + size_t); + +int nilfs_sufile_update(struct inode *, __u64, int, + void (*dofunc)(struct inode *, __u64, + struct buffer_head *, + struct buffer_head *)); +void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *, + struct buffer_head *); +void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *, + struct buffer_head *); +void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *, + struct buffer_head *); +void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *, + struct buffer_head *); + +/** + * nilfs_sufile_cancel_free - + * @sufile: inode of segment usage file + * @segnum: segment number + * + * Description: + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + */ +static inline int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum) +{ + return nilfs_sufile_update(sufile, segnum, 0, + nilfs_sufile_do_cancel_free); +} + +/** + * nilfs_sufile_scrap - make a segment garbage + * @sufile: inode of segment usage file + * @segnum: segment number to be freed + */ +static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum) +{ + return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap); +} + +/** + * nilfs_sufile_free - free segment + * @sufile: inode of segment usage file + * @segnum: segment number to be freed + */ +static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum) +{ + return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free); +} + +/** + * nilfs_sufile_set_error - mark a segment as erroneous + * @sufile: inode of segment usage file + * @segnum: segment number + * + * Description: nilfs_sufile_set_error() marks the segment specified by + * @segnum as erroneous. The error segment will never be used again. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error codes is returned. + * + * %-EIO - I/O error. + * + * %-ENOMEM - Insufficient amount of memory available. + * + * %-EINVAL - Invalid segment usage number. + */ +static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum) +{ + return nilfs_sufile_update(sufile, segnum, 0, + nilfs_sufile_do_set_error); +} + +#endif /* _NILFS_SUFILE_H */ |