forked from Minki/linux
ef7d4757a5
Previously, this function took an status code to return possible error
codes. The ("nilfs2: add local variable to cache the number of clean
segments") patch removed the possibility to return errors.
So, this simplifies the function definition to make it directly return
the number of clean segments.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/*
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* sufile.h - NILFS segment usage file.
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*
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* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#ifndef _NILFS_SUFILE_H
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#define _NILFS_SUFILE_H
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/nilfs2_fs.h>
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#include "mdt.h"
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static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
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{
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return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
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}
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unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
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int nilfs_sufile_alloc(struct inode *, __u64 *);
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int nilfs_sufile_get_segment_usage(struct inode *, __u64,
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struct nilfs_segment_usage **,
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struct buffer_head **);
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void nilfs_sufile_put_segment_usage(struct inode *, __u64,
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struct buffer_head *);
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int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
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ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
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size_t);
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int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *));
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int nilfs_sufile_update(struct inode *, __u64, int,
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void (*dofunc)(struct inode *, __u64,
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struct buffer_head *,
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struct buffer_head *));
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void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
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struct buffer_head *);
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int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode);
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struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize);
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/**
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* nilfs_sufile_scrap - make a segment garbage
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* @sufile: inode of segment usage file
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* @segnum: segment number to be freed
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*/
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static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
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}
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/**
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* nilfs_sufile_free - free segment
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* @sufile: inode of segment usage file
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* @segnum: segment number to be freed
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*/
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static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
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}
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/**
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* nilfs_sufile_freev - free segments
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* @sufile: inode of segment usage file
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* @segnumv: array of segment numbers
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* @nsegs: size of @segnumv array
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* @ndone: place to store the number of freed segments
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*/
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static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
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size_t nsegs, size_t *ndone)
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{
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return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
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nilfs_sufile_do_free);
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}
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/**
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* nilfs_sufile_cancel_freev - reallocate freeing segments
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* @sufile: inode of segment usage file
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* @segnumv: array of segment numbers
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* @nsegs: size of @segnumv array
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* @ndone: place to store the number of cancelled segments
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*
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* Return Value: On success, 0 is returned. On error, a negative error codes
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* is returned.
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*/
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static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
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__u64 *segnumv, size_t nsegs,
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size_t *ndone)
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{
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return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
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nilfs_sufile_do_cancel_free);
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}
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/**
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* nilfs_sufile_set_error - mark a segment as erroneous
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* @sufile: inode of segment usage file
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* @segnum: segment number
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*
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* Description: nilfs_sufile_set_error() marks the segment specified by
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* @segnum as erroneous. The error segment will never be used again.
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*
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* Return Value: On success, 0 is returned. On error, one of the following
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* negative error codes is returned.
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*
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* %-EIO - I/O error.
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*
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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-EINVAL - Invalid segment usage number.
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*/
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static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
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{
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return nilfs_sufile_update(sufile, segnum, 0,
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nilfs_sufile_do_set_error);
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}
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#endif /* _NILFS_SUFILE_H */
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