/* * 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" 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, void *, unsigned, size_t); int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *, void (*dofunc)(struct inode *, __u64, struct buffer_head *, struct buffer_head *)); int nilfs_sufile_update(struct inode *, __u64, int, void (*dofunc)(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_cancel_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_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_freev - free segments * @sufile: inode of segment usage file * @segnumv: array of segment numbers * @nsegs: size of @segnumv array * @ndone: place to store the number of freed segments */ static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv, size_t nsegs, size_t *ndone) { return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, nilfs_sufile_do_free); } /** * nilfs_sufile_cancel_freev - reallocate freeing segments * @sufile: inode of segment usage file * @segnumv: array of segment numbers * @nsegs: size of @segnumv array * @ndone: place to store the number of cancelled segments * * Return Value: On success, 0 is returned. On error, a negative error codes * is returned. */ static inline int nilfs_sufile_cancel_freev(struct inode *sufile, __u64 *segnumv, size_t nsegs, size_t *ndone) { return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone, nilfs_sufile_do_cancel_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 */