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/*
* nilfs_gc.h - NILFS garbage collection library
*
* Licensed under LGPLv2: the complete text of the GNU Lesser General
* Public License can be found in COPYING file of the nilfs-utils
* package.
*
* Copyright (C) 2008-2012 Nippon Telegraph and Telephone Corporation.
*/
#ifndef NILFS_GC_H
#define NILFS_GC_H
#include <sys/types.h>
#include "nilfs.h"
/* flags for nilfs_reclaim_params struct */
#define NILFS_RECLAIM_PARAM_PROTSEQ (1UL << 0)
#define NILFS_RECLAIM_PARAM_PROTCNO (1UL << 1)
#define NILFS_RECLAIM_PARAM_MIN_RECLAIMABLE_BLKS (1UL << 2)
#define __NR_NILFS_RECLAIM_PARAMS 3
/**
* struct nilfs_reclaim_params - structure to specify GC parameters
* @flags: flags of valid fields
* @min_reclaimable_blks: minimum number of reclaimable blocks
* @protseq: start of sequence number of protected segments
* @protcno: start number of checkpoint to be protected
*/
struct nilfs_reclaim_params {
unsigned long flags;
unsigned long min_reclaimable_blks;
__u64 protseq;
nilfs_cno_t protcno;
};
/**
* struct nilfs_reclaim_stat - structure to store GC statistics
* @exflags: flags for extended fields (reserved)
* @cleaned_segs: number of cleaned segments
* @protected_segs: number of protected (deselected) segments
* @deferred_segs: number of deferred segments
* @live_blks: number of live (in-use) blocks
* @live_vblks: number of live (in-use) virtual blocks
* @live_pblks: number of live (in-use) DAT file blocks
* @defunct_blks: number of defunct (reclaimable) blocks
* @defunct_vblks: number of defunct (reclaimable) virtual blocks
* @defunct_pblks: number of defunct (reclaimable) DAT file blocks
* @freed_vblks: number of freed virtual blocks
*/
struct nilfs_reclaim_stat {
unsigned long exflags;
size_t cleaned_segs;
size_t protected_segs;
size_t deferred_segs;
size_t live_blks;
size_t live_vblks;
size_t live_pblks;
size_t defunct_blks;
size_t defunct_vblks;
size_t defunct_pblks;
size_t freed_vblks;
};
ssize_t nilfs_reclaim_segment(struct nilfs *nilfs,
__u64 *segnums, size_t nsegs,
__u64 protseq, nilfs_cno_t protcno);
int nilfs_xreclaim_segment(struct nilfs *nilfs,
__u64 *segnums, size_t nsegs, int dryrun,
const struct nilfs_reclaim_params *params,
struct nilfs_reclaim_stat *stat);
static inline int
nilfs_assess_segment(struct nilfs *nilfs,
__u64 *segnums, size_t nsegs,
const struct nilfs_reclaim_params *params,
struct nilfs_reclaim_stat *stat)
{
return nilfs_xreclaim_segment(nilfs, segnums, nsegs, 1, params, stat);
}
static inline int nilfs_suinfo_reclaimable(const struct nilfs_suinfo *si)
{
return nilfs_suinfo_dirty(si) &&
!nilfs_suinfo_active(si) && !nilfs_suinfo_error(si);
}
extern void (*nilfs_gc_logger)(int priority, const char *fmt, ...);
#endif /* NILFS_GC_H */
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