Release 4.10 fs/nilfs2/segment.c

/*
 * segment.c - NILFS segment constructor.
 *
 * Copyright (C) 2005-2008 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.
 *
 * Written by Ryusuke Konishi.
 *
 */

#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/bitops.h>
#include <linux/bio.h>
#include <linux/completion.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/crc32.h>
#include <linux/pagevec.h>
#include <linux/slab.h>
#include "nilfs.h"
#include "btnode.h"
#include "page.h"
#include "segment.h"
#include "sufile.h"
#include "cpfile.h"
#include "ifile.h"
#include "segbuf.h"


/*
 * Segment constructor
 */

#define SC_N_INODEVEC	16   
/* Size of locally allocated inode vector */


#define SC_MAX_SEGDELTA 64   
/*
                              * Upper limit of the number of segments
                              * appended in collection retry loop
                              */

/* Construction mode */
enum {
	
SC_LSEG_SR = 1,	/* Make a logical segment having a super root */
	
SC_LSEG_DSYNC,	/*
                         * Flush data blocks of a given file and make
                         * a logical segment without a super root.
                         */
	
SC_FLUSH_FILE,	/*
                         * Flush data files, leads to segment writes without
                         * creating a checkpoint.
                         */
	
SC_FLUSH_DAT,	/*
                         * Flush DAT file.  This also creates segments
                         * without a checkpoint.
                         */
};

/* Stage numbers of dirty block collection */
enum {
	
NILFS_ST_INIT = 0,
	
NILFS_ST_GC,		/* Collecting dirty blocks for GC */
	
NILFS_ST_FILE,
	
NILFS_ST_IFILE,
	
NILFS_ST_CPFILE,
	
NILFS_ST_SUFILE,
	
NILFS_ST_DAT,
	
NILFS_ST_SR,		/* Super root */
	
NILFS_ST_DSYNC,		/* Data sync blocks */
	
NILFS_ST_DONE,
};


#define CREATE_TRACE_POINTS
#include <trace/events/nilfs2.h>

/*
 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
 * the variable must use them because transition of stage count must involve
 * trace events (trace_nilfs2_collection_stage_transition).
 *
 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
 * produce tracepoint events. It is provided just for making the intention
 * clear.
 */


static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci)
{
	sci->sc_stage.scnt++;
	trace_nilfs2_collection_stage_transition(sci);
}

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static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt)
{
	sci->sc_stage.scnt = next_scnt;
	trace_nilfs2_collection_stage_transition(sci);
}

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static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci)
{
	return sci->sc_stage.scnt;
}

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/* State flags of collection */

#define NILFS_CF_NODE		0x0001	
/* Collecting node blocks */

#define NILFS_CF_IFILE_STARTED	0x0002	
/* IFILE stage has started */

#define NILFS_CF_SUFREED	0x0004	
/* segment usages has been freed */

#define NILFS_CF_HISTORY_MASK	(NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)

/* Operations depending on the construction mode and file type */

struct nilfs_sc_operations {
	
int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
			    struct inode *);
	
int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
			    struct inode *);
	
int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
			    struct inode *);
	
void (*write_data_binfo)(struct nilfs_sc_info *,
				 struct nilfs_segsum_pointer *,
				 union nilfs_binfo *);
	
void (*write_node_binfo)(struct nilfs_sc_info *,
				 struct nilfs_segsum_pointer *,
				 union nilfs_binfo *);
};

/*
 * Other definitions
 */
static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);


#define nilfs_cnt32_gt(a, b)   \
	(typecheck(__u32, a) && typecheck(__u32, b) && \
         ((__s32)(b) - (__s32)(a) < 0))

#define nilfs_cnt32_ge(a, b)   \
	(typecheck(__u32, a) && typecheck(__u32, b) && \
         ((__s32)(a) - (__s32)(b) >= 0))

#define nilfs_cnt32_lt(a, b)  nilfs_cnt32_gt(b, a)

#define nilfs_cnt32_le(a, b)  nilfs_cnt32_ge(b, a)



static int nilfs_prepare_segment_lock(struct super_block *sb,
				      struct nilfs_transaction_info *ti)
{
	struct nilfs_transaction_info *cur_ti = current->journal_info;
	void *save = NULL;

	if (cur_ti) {
		if (cur_ti->ti_magic == NILFS_TI_MAGIC)
			return ++cur_ti->ti_count;

		/*
                 * If journal_info field is occupied by other FS,
                 * it is saved and will be restored on
                 * nilfs_transaction_commit().
                 */
		nilfs_msg(sb, KERN_WARNING, "journal info from a different FS");
		save = current->journal_info;
	}
	if (!ti) {
		ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
		if (!ti)
			return -ENOMEM;
		ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
	} else {
		ti->ti_flags = 0;
	}
	ti->ti_count = 0;
	ti->ti_save = save;
	ti->ti_magic = NILFS_TI_MAGIC;
	current->journal_info = ti;
	return 0;
}

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/**
 * nilfs_transaction_begin - start indivisible file operations.
 * @sb: super block
 * @ti: nilfs_transaction_info
 * @vacancy_check: flags for vacancy rate checks
 *
 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
 * the segment semaphore, to make a segment construction and write tasks
 * exclusive.  The function is used with nilfs_transaction_commit() in pairs.
 * The region enclosed by these two functions can be nested.  To avoid a
 * deadlock, the semaphore is only acquired or released in the outermost call.
 *
 * This function allocates a nilfs_transaction_info struct to keep context
 * information on it.  It is initialized and hooked onto the current task in
 * the outermost call.  If a pre-allocated struct is given to @ti, it is used
 * instead; otherwise a new struct is assigned from a slab.
 *
 * When @vacancy_check flag is set, this function will check the amount of
 * free space, and will wait for the GC to reclaim disk space if low capacity.
 *
 * Return Value: On success, 0 is returned. On error, one of the following
 * negative error code is returned.
 *
 * %-ENOMEM - Insufficient memory available.
 *
 * %-ENOSPC - No space left on device
 */


int nilfs_transaction_begin(struct super_block *sb,
			    struct nilfs_transaction_info *ti,
			    int vacancy_check)
{
	struct the_nilfs *nilfs;
	int ret = nilfs_prepare_segment_lock(sb, ti);
	struct nilfs_transaction_info *trace_ti;

	if (unlikely(ret < 0))
		return ret;
	if (ret > 0) {
		trace_ti = current->journal_info;

		trace_nilfs2_transaction_transition(sb, trace_ti,
				    trace_ti->ti_count, trace_ti->ti_flags,
				    TRACE_NILFS2_TRANSACTION_BEGIN);
		return 0;
	}

	sb_start_intwrite(sb);

	nilfs = sb->s_fs_info;
	down_read(&nilfs->ns_segctor_sem);
	if (vacancy_check && nilfs_near_disk_full(nilfs)) {
		up_read(&nilfs->ns_segctor_sem);
		ret = -ENOSPC;
		goto failed;
	}

	trace_ti = current->journal_info;
	trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count,
					    trace_ti->ti_flags,
					    TRACE_NILFS2_TRANSACTION_BEGIN);
	return 0;

 failed:
	ti = current->journal_info;
	current->journal_info = ti->ti_save;
	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
		kmem_cache_free(nilfs_transaction_cachep, ti);
	sb_end_intwrite(sb);
	return ret;
}

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/**
 * nilfs_transaction_commit - commit indivisible file operations.
 * @sb: super block
 *
 * nilfs_transaction_commit() releases the read semaphore which is
 * acquired by nilfs_transaction_begin(). This is only performed
 * in outermost call of this function.  If a commit flag is set,
 * nilfs_transaction_commit() sets a timer to start the segment
 * constructor.  If a sync flag is set, it starts construction
 * directly.
 */


int nilfs_transaction_commit(struct super_block *sb)
{
	struct nilfs_transaction_info *ti = current->journal_info;
	struct the_nilfs *nilfs = sb->s_fs_info;
	int err = 0;

	BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
	ti->ti_flags |= NILFS_TI_COMMIT;
	if (ti->ti_count > 0) {
		ti->ti_count--;
		trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
		return 0;
	}
	if (nilfs->ns_writer) {
		struct nilfs_sc_info *sci = nilfs->ns_writer;

		if (ti->ti_flags & NILFS_TI_COMMIT)
			nilfs_segctor_start_timer(sci);
		if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
			nilfs_segctor_do_flush(sci, 0);
	}
	up_read(&nilfs->ns_segctor_sem);
	trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);

	current->journal_info = ti->ti_save;

	if (ti->ti_flags & NILFS_TI_SYNC)
		err = nilfs_construct_segment(sb);
	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
		kmem_cache_free(nilfs_transaction_cachep, ti);
	sb_end_intwrite(sb);
	return err;
}

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void nilfs_transaction_abort(struct super_block *sb)
{
	struct nilfs_transaction_info *ti = current->journal_info;
	struct the_nilfs *nilfs = sb->s_fs_info;

	BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
	if (ti->ti_count > 0) {
		ti->ti_count--;
		trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
		return;
	}
	up_read(&nilfs->ns_segctor_sem);

	trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
		    ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);

	current->journal_info = ti->ti_save;
	if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
		kmem_cache_free(nilfs_transaction_cachep, ti);
	sb_end_intwrite(sb);
}

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void nilfs_relax_pressure_in_lock(struct super_block *sb)
{
	struct the_nilfs *nilfs = sb->s_fs_info;
	struct nilfs_sc_info *sci = nilfs->ns_writer;

	if (!sci || !sci->sc_flush_request)
		return;

	set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
	up_read(&nilfs->ns_segctor_sem);

	down_write(&nilfs->ns_segctor_sem);
	if (sci->sc_flush_request &&
	    test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
		struct nilfs_transaction_info *ti = current->journal_info;

		ti->ti_flags |= NILFS_TI_WRITER;
		nilfs_segctor_do_immediate_flush(sci);
		ti->ti_flags &= ~NILFS_TI_WRITER;
	}
	downgrade_write(&nilfs->ns_segctor_sem);
}

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static void nilfs_transaction_lock(struct super_block *sb,
				   struct nilfs_transaction_info *ti,
				   int gcflag)
{
	struct nilfs_transaction_info *cur_ti = current->journal_info;
	struct the_nilfs *nilfs = sb->s_fs_info;
	struct nilfs_sc_info *sci = nilfs->ns_writer;

	WARN_ON(cur_ti);
	ti->ti_flags = NILFS_TI_WRITER;
	ti->ti_count = 0;
	ti->ti_save = cur_ti;
	ti->ti_magic = NILFS_TI_MAGIC;
	current->journal_info = ti;

	for (;;) {
		trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK);

		down_write(&nilfs->ns_segctor_sem);
		if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
			break;

		nilfs_segctor_do_immediate_flush(sci);

		up_write(&nilfs->ns_segctor_sem);
		cond_resched();
	}
	if (gcflag)
		ti->ti_flags |= NILFS_TI_GC;

	trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK);
}

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static void nilfs_transaction_unlock(struct super_block *sb)
{
	struct nilfs_transaction_info *ti = current->journal_info;
	struct the_nilfs *nilfs = sb->s_fs_info;

	BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
	BUG_ON(ti->ti_count > 0);

	up_write(&nilfs->ns_segctor_sem);
	current->journal_info = ti->ti_save;

	trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
			    ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK);
}

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static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
					    struct nilfs_segsum_pointer *ssp,
					    unsigned int bytes)
{
	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
	unsigned int blocksize = sci->sc_super->s_blocksize;
	void *p;

	if (unlikely(ssp->offset + bytes > blocksize)) {
		ssp->offset = 0;
		BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
					       &segbuf->sb_segsum_buffers));
		ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
	}
	p = ssp->bh->b_data + ssp->offset;
	ssp->offset += bytes;
	return p;
}

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/**
 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
 * @sci: nilfs_sc_info
 */


static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
{
	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
	struct buffer_head *sumbh;
	unsigned int sumbytes;
	unsigned int flags = 0;
	int err;

	if (nilfs_doing_gc())
		flags = NILFS_SS_GC;
	err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
	if (unlikely(err))
		return err;

	sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
	sumbytes = segbuf->sb_sum.sumbytes;
	sci->sc_finfo_ptr.bh = sumbh;  sci->sc_finfo_ptr.offset = sumbytes;
	sci->sc_binfo_ptr.bh = sumbh;  sci->sc_binfo_ptr.offset = sumbytes;
	sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
	return 0;
}

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static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
{
	sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
	if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
		return -E2BIG; /*
                                * The current segment is filled up
                                * (internal code)
                                */
	sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
	return nilfs_segctor_reset_segment_buffer(sci);
}

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static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
{
	struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
	int err;

	if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
		err = nilfs_segctor_feed_segment(sci);
		if (err)
			return err;
		segbuf = sci->sc_curseg;
	}
	err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
	if (likely(!err))
		segbuf->sb_sum.flags |= NILFS_SS_SR;
	return err;
}

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/*
 * Functions for making segment summary and payloads
 */


static int nilfs_segctor_segsum_block_required(
	struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
	unsigned int binfo_size)
{
	unsigned int blocksize = sci->sc_super->s_blocksize;
	/* Size of finfo and binfo is enough small against blocksize */

	return ssp->offset + binfo_size +
		(!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
		blocksize;
}

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static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
				      struct inode *inode)
{
	sci->sc_curseg->sb_sum.nfinfo++;
	sci->sc_binfo_ptr = sci->sc_finfo_ptr;
	nilfs_segctor_map_segsum_entry(
		sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));

	if (NILFS_I(inode)->i_root &&
	    !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
		set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
	/* skip finfo */
}

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static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
				    struct inode *inode)
{
	struct nilfs_finfo *finfo;
	struct nilfs_inode_info *ii;
	struct nilfs_segment_buffer *segbuf;
	__u64 cno;

	if (sci->sc_blk_cnt == 0)
		return;

	ii = NILFS_I(inode);

	if (test_bit(NILFS_I_GCINODE, &ii->i_state))
		cno = ii->i_cno;
	else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
		cno = 0;
	else
		cno = sci->sc_cno;

	finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
						 sizeof(*finfo));
	finfo->fi_ino = cpu_to_le64(inode->i_ino);
	finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
	finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
	finfo->fi_cno = cpu_to_le64(cno);

	segbuf = sci->sc_curseg;
	segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
		sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
	sci->sc_finfo_ptr = sci->sc_binfo_ptr;
	sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
}

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static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
					struct buffer_head *bh,
					struct inode *inode,
					unsigned int binfo_size)
{
	struct nilfs_segment_buffer *segbuf;
	int required, err = 0;

 retry:
	segbuf = sci->sc_curseg;
	required = nilfs_segctor_segsum_block_required(
		sci, &sci->sc_binfo_ptr, binfo_size);
	if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
		nilfs_segctor_end_finfo(sci, inode);
		err = nilfs_segctor_feed_segment(sci);
		if (err)
			return err;
		goto retry;
	}
	if (unlikely(required)) {
		err = nilfs_segbuf_extend_segsum(segbuf);
		if (unlikely(err))
			goto failed;
	}
	if (sci->sc_blk_cnt == 0)
		nilfs_segctor_begin_finfo(sci, inode);

	nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
	/* Substitution to vblocknr is delayed until update_blocknr() */
	nilfs_segbuf_add_file_buffer(segbuf, bh);
	sci->sc_blk_cnt++;
 failed:
	return err;
}

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/*
 * Callback functions that enumerate, mark, and collect dirty blocks
 */


static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
				   struct buffer_head *bh, struct inode *inode)
{
	int err;

	err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
	if (err < 0)
		return err;

	err = nilfs_segctor_add_file_block(sci, bh, inode,
					   sizeof(struct nilfs_binfo_v));
	if (!err)
		sci->sc_datablk_cnt++;
	return err;
}

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static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
				   struct buffer_head *bh,
				   struct inode *inode)
{
	return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
}

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static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
				   struct buffer_head *bh,
				   struct inode *inode)
{
	WARN_ON(!buffer_dirty(bh));
	return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
}

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static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
					struct nilfs_segsum_pointer *ssp,
					union nilfs_binfo *binfo)
{
	struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
		sci, ssp, sizeof(*binfo_v));
	*binfo_v = binfo->bi_v;
}

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static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
					struct nilfs_segsum_pointer *ssp,
					union nilfs_binfo *binfo)
{
	__le64 *vblocknr = nilfs_segctor_map_segsum_entry(
		sci, ssp, sizeof(*vblocknr));
	*vblocknr = binfo->bi_v.bi_vblocknr;
}

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static const struct nilfs_sc_operations nilfs_sc_file_ops = {
	.collect_data = nilfs_collect_file_data,
	.collect_node = nilfs_collect_file_node,
	.collect_bmap = nilfs_collect_file_bmap,
	.write_data_binfo = nilfs_write_file_data_binfo,
	.write_node_binfo = nilfs_write_file_node_binfo,
};



static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
				  struct buffer_head *bh, struct inode *inode)
{
	int err;

	err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
	if (err < 0)
		return err;

	err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
	if (!err)
		sci->sc_datablk_cnt++;
	return err;
}

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static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
				  struct buffer_head *bh, struct inode *inode)
{
	WARN_ON(!buffer_dirty(bh));
	return nilfs_segctor_add_file_block(sci, bh, inode,
					    sizeof(struct nilfs_binfo_dat));
}

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static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
				       struct nilfs_segsum_pointer *ssp,
				       union nilfs_binfo *binfo)
{
	__le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
							  sizeof(*blkoff));
	*blkoff = binfo->bi_dat.bi_blkoff;
}

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static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
				       struct nilfs_segsum_pointer *ssp,
				       union nilfs_binfo *binfo)
{
	struct nilfs_binfo_dat *binfo_dat =
		nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
	*binfo_dat = binfo->bi_dat;
}

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static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
	.collect_data = nilfs_collect_dat_data,
	.collect_node = nilfs_collect_file_node,
	.collect_bmap = nilfs_collect_dat_bmap,
	.write_data_binfo = nilfs_write_dat_data_binfo,
	.write_node_binfo = nilfs_write_dat_node_binfo,
};


static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
	.collect_data = nilfs_collect_file_data,
	.collect_node = NULL,
	.collect_bmap = NULL,
	.write_data_binfo = nilfs_write_file_data_binfo,
	.write_node_binfo = NULL,
};



static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
					      struct list_head *listp,
					      size_t nlimit,
					      loff_t start, loff_t end)
{
	struct address_space *mapping = inode->i_mapping;
	struct pagevec pvec;
	pgoff_t index = 0, last = ULONG_MAX;
	size_t ndirties = 0;
	int i;

	if (unlikely(start != 0 || end != LLONG_MAX)) {
		/*
                 * A valid range is given for sync-ing data pages. The
                 * range is rounded to per-page; extra dirty buffers
                 * may be included if blocksize < pagesize.
                 */
		index = start >> PAGE_SHIFT;
		last = end >>