Commit 8b94025c authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: refactor recovery logic routines 



Most functions in recovery code take an argument of a super block
instance or a nilfs_sb_info struct for convenience sake.

This replaces them aggressively with a nilfs object by applying
__bread and __breadahead against routines using sb_bread and
sb_breadahead.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 92c60cca

fs/nilfs2/recovery.c

+94 −66
Original line number Diff line number Diff line
@@ -110,8 +110,8 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi, 
}



/**

 * calc_crc_cont - check CRC of blocks continuously

 * @sbi: nilfs_sb_info

 * nilfs_compute_checksum - compute checksum of blocks continuously

 * @nilfs: nilfs object

 * @bhs: buffer head of start block

 * @sum: place to store result

 * @offset: offset bytes in the first block
@@ -119,23 +119,25 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi, 
 * @start: DBN of start block

 * @nblock: number of blocks to be checked

 */

static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,

			 u32 *sum, unsigned long offset, u64 check_bytes,

static int nilfs_compute_checksum(struct the_nilfs *nilfs,

				  struct buffer_head *bhs, u32 *sum,

				  unsigned long offset, u64 check_bytes,

				  sector_t start, unsigned long nblock)

{

	unsigned long blocksize = sbi->s_super->s_blocksize;

	unsigned int blocksize = nilfs->ns_blocksize;

	unsigned long size;

	u32 crc;



	BUG_ON(offset >= blocksize);

	check_bytes -= offset;

	size = min_t(u64, check_bytes, blocksize - offset);

	crc = crc32_le(sbi->s_nilfs->ns_crc_seed,

	crc = crc32_le(nilfs->ns_crc_seed,

		       (unsigned char *)bhs->b_data + offset, size);

	if (--nblock > 0) {

		do {

			struct buffer_head *bh

				= sb_bread(sbi->s_super, ++start);

			struct buffer_head *bh;



			bh = __bread(nilfs->ns_bdev, ++start, blocksize);

			if (!bh)

				return -EIO;

			check_bytes -= size;
@@ -150,12 +152,12 @@ static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs, 


/**

 * nilfs_read_super_root_block - read super root block

 * @sb: super_block

 * @nilfs: nilfs object

 * @sr_block: disk block number of the super root block

 * @pbh: address of a buffer_head pointer to return super root buffer

 * @check: CRC check flag

 */

int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,

int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,

				struct buffer_head **pbh, int check)

{

	struct buffer_head *bh_sr;
@@ -164,7 +166,7 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, 
	int ret;



	*pbh = NULL;

	bh_sr = sb_bread(sb, sr_block);

	bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize);

	if (unlikely(!bh_sr)) {

		ret = NILFS_SEG_FAIL_IO;

		goto failed;
@@ -174,12 +176,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, 
	if (check) {

		unsigned bytes = le16_to_cpu(sr->sr_bytes);



		if (bytes == 0 || bytes > sb->s_blocksize) {

		if (bytes == 0 || bytes > nilfs->ns_blocksize) {

			ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;

			goto failed_bh;

		}

		if (calc_crc_cont(NILFS_SB(sb), bh_sr, &crc,

				  sizeof(sr->sr_sum), bytes, sr_block, 1)) {

		if (nilfs_compute_checksum(

			    nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes,

			    sr_block, 1)) {

			ret = NILFS_SEG_FAIL_IO;

			goto failed_bh;

		}
@@ -200,13 +203,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block, 


/**

 * load_segment_summary - read segment summary of the specified partial segment

 * @sbi: nilfs_sb_info

 * @nilfs: nilfs object

 * @pseg_start: start disk block number of partial segment

 * @seg_seq: sequence number requested

 * @ssi: pointer to nilfs_segsum_info struct to store information

 */

static int

load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,

load_segment_summary(struct the_nilfs *nilfs, sector_t pseg_start,

		     u64 seg_seq, struct nilfs_segsum_info *ssi)

{

	struct buffer_head *bh_sum;
@@ -215,7 +218,7 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, 
	u32 crc;

	int ret = NILFS_SEG_FAIL_IO;



	bh_sum = sb_bread(sbi->s_super, pseg_start);

	bh_sum = __bread(nilfs->ns_bdev, pseg_start, nilfs->ns_blocksize);

	if (!bh_sum)

		goto out;
@@ -226,21 +229,20 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, 
		ret = NILFS_SEG_FAIL_MAGIC;

		goto failed;

	}

	store_segsum_info(ssi, sum, sbi->s_super->s_blocksize);

	store_segsum_info(ssi, sum, nilfs->ns_blocksize);

	if (seg_seq != ssi->seg_seq) {

		ret = NILFS_SEG_FAIL_SEQ;

		goto failed;

	}



	nblock = ssi->nblocks;

	if (unlikely(nblock == 0 ||

		     nblock > sbi->s_nilfs->ns_blocks_per_segment)) {

	if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) {

		/* This limits the number of blocks read in the CRC check */

		ret = NILFS_SEG_FAIL_CONSISTENCY;

		goto failed;

	}

	if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum),

			  ((u64)nblock << sbi->s_super->s_blocksize_bits),

	if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum),

				   ((u64)nblock << nilfs->ns_blocksize_bits),

				   pseg_start, nblock)) {

		ret = NILFS_SEG_FAIL_IO;

		goto failed;
@@ -255,7 +257,15 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start, 
	return ret;

}



static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,

/**

 * nilfs_read_summary_info - read an item on summary blocks of a log

 * @nilfs: nilfs object

 * @pbh: the current buffer head on summary blocks [in, out]

 * @offset: the current byte offset on summary blocks [in, out]

 * @bytes: byte size of the item to be read

 */

static void *nilfs_read_summary_info(struct the_nilfs *nilfs,

				     struct buffer_head **pbh,

				     unsigned int *offset, unsigned int bytes)

{

	void *ptr;
@@ -265,7 +275,8 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh, 
	if (bytes > (*pbh)->b_size - *offset) {

		blocknr = (*pbh)->b_blocknr;

		brelse(*pbh);

		*pbh = sb_bread(sb, blocknr + 1);

		*pbh = __bread(nilfs->ns_bdev, blocknr + 1,

			       nilfs->ns_blocksize);

		if (unlikely(!*pbh))

			return NULL;

		*offset = 0;
@@ -275,7 +286,16 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh, 
	return ptr;

}



static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,

/**

 * nilfs_skip_summary_info - skip items on summary blocks of a log

 * @nilfs: nilfs object

 * @pbh: the current buffer head on summary blocks [in, out]

 * @offset: the current byte offset on summary blocks [in, out]

 * @bytes: byte size of the item to be skipped

 * @count: number of items to be skipped

 */

static void nilfs_skip_summary_info(struct the_nilfs *nilfs,

				    struct buffer_head **pbh,

				    unsigned int *offset, unsigned int bytes,

				    unsigned long count)

{
@@ -294,26 +314,33 @@ static void segsum_skip(struct super_block *sb, struct buffer_head **pbh, 
		*offset = bytes * (count - (bcnt - 1) * nitem_per_block);



		brelse(*pbh);

		*pbh = sb_bread(sb, blocknr + bcnt);

		*pbh = __bread(nilfs->ns_bdev, blocknr + bcnt,

			       nilfs->ns_blocksize);

	}

}



static int

collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,

/**

 * nilfs_scan_dsync_log - get block information of a log written for data sync

 * @nilfs: nilfs object

 * @start_blocknr: start block number of the log

 * @ssi: log summary information

 * @head: list head to add nilfs_recovery_block struct

 */

static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,

				struct nilfs_segsum_info *ssi,

				struct list_head *head)

{

	struct buffer_head *bh;

	unsigned int offset;

	unsigned long nfinfo = ssi->nfinfo;

	sector_t blocknr = sum_blocknr + ssi->nsumblk;

	sector_t blocknr = start_blocknr + ssi->nsumblk;

	ino_t ino;

	int err = -EIO;



	if (!nfinfo)

		return 0;



	bh = sb_bread(sbi->s_super, sum_blocknr);

	bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);

	if (unlikely(!bh))

		goto out;
@@ -323,7 +350,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, 
		unsigned long nblocks, ndatablk, nnodeblk;

		struct nilfs_finfo *finfo;



		finfo = segsum_get(sbi->s_super, &bh, &offset, sizeof(*finfo));

		finfo = nilfs_read_summary_info(nilfs, &bh, &offset,

						sizeof(*finfo));

		if (unlikely(!finfo))

			goto out;
@@ -336,7 +364,7 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, 
			struct nilfs_recovery_block *rb;

			struct nilfs_binfo_v *binfo;



			binfo = segsum_get(sbi->s_super, &bh, &offset,

			binfo = nilfs_read_summary_info(nilfs, &bh, &offset,

							sizeof(*binfo));

			if (unlikely(!binfo))

				goto out;
@@ -355,8 +383,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr, 
		}

		if (--nfinfo == 0)

			break;

		blocknr += nnodeblk; /* always 0 for the data sync segments */

		segsum_skip(sbi->s_super, &bh, &offset, sizeof(__le64),

		blocknr += nnodeblk; /* always 0 for data sync logs */

		nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64),

					nnodeblk);

		if (unlikely(!bh))

			goto out;
@@ -467,14 +495,14 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs, 
	return err;

}



static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,

static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,

				     struct nilfs_recovery_block *rb,

				     struct page *page)

{

	struct buffer_head *bh_org;

	void *kaddr;



	bh_org = sb_bread(sbi->s_super, rb->blocknr);

	bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);

	if (unlikely(!bh_org))

		return -EIO;
@@ -485,13 +513,14 @@ static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi, 
	return 0;

}



static int recover_dsync_blocks(struct nilfs_sb_info *sbi,

static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,

				      struct nilfs_sb_info *sbi,

				      struct list_head *head,

				      unsigned long *nr_salvaged_blocks)

{

	struct inode *inode;

	struct nilfs_recovery_block *rb, *n;

	unsigned blocksize = sbi->s_super->s_blocksize;

	unsigned blocksize = nilfs->ns_blocksize;

	struct page *page;

	loff_t pos;

	int err = 0, err2 = 0;
@@ -511,7 +540,7 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi, 
		if (unlikely(err))

			goto failed_inode;



		err = nilfs_recovery_copy_block(sbi, rb, page);

		err = nilfs_recovery_copy_block(nilfs, rb, page);

		if (unlikely(err))

			goto failed_page;
@@ -551,8 +580,8 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi, 
/**

 * nilfs_do_roll_forward - salvage logical segments newer than the latest

 * checkpoint

 * @nilfs: nilfs object

 * @sbi: nilfs_sb_info

 * @nilfs: the_nilfs

 * @ri: pointer to a nilfs_recovery_info

 */

static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
@@ -582,7 +611,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 


	while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {



		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);

		ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi);

		if (ret) {

			if (ret == NILFS_SEG_FAIL_IO) {

				err = -EIO;
@@ -610,13 +639,14 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 
			if (!NILFS_SEG_DSYNC(&ssi))

				goto confused;



			err = collect_blocks_from_segsum(

				sbi, pseg_start, &ssi, &dsync_blocks);

			err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi,

						   &dsync_blocks);

			if (unlikely(err))

				goto failed;

			if (NILFS_SEG_LOGEND(&ssi)) {

				err = recover_dsync_blocks(

					sbi, &dsync_blocks, &nsalvaged_blocks);

				err = nilfs_recover_dsync_blocks(

					nilfs, sbi, &dsync_blocks,

					&nsalvaged_blocks);

				if (unlikely(err))

					goto failed;

				state = RF_INIT_ST;
@@ -653,7 +683,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 
	}

 out:

	dispose_recovery_list(&dsync_blocks);

	nilfs_detach_writer(sbi->s_nilfs, sbi);

	nilfs_detach_writer(nilfs, sbi);

	return err;



 confused:
@@ -667,7 +697,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, 
}



static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,

				      struct nilfs_sb_info *sbi,

				      struct nilfs_recovery_info *ri)

{

	struct buffer_head *bh;
@@ -677,7 +706,7 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, 
	    nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))

		return;



	bh = sb_getblk(sbi->s_super, ri->ri_lsegs_start);

	bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);

	BUG_ON(!bh);

	memset(bh->b_data, 0, bh->b_size);

	set_buffer_dirty(bh);
@@ -751,7 +780,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, 
			goto failed;

		}



		nilfs_finish_roll_forward(nilfs, sbi, ri);

		nilfs_finish_roll_forward(nilfs, ri);

	}



 failed:
@@ -762,7 +791,6 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, 
/**

 * nilfs_search_super_root - search the latest valid super root

 * @nilfs: the_nilfs

 * @sbi: nilfs_sb_info

 * @ri: pointer to a nilfs_recovery_info struct to store search results.

 *

 * nilfs_search_super_root() looks for the latest super-root from a partial
@@ -776,7 +804,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs, 
 *

 * %-EIO - I/O error

 */

int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,

int nilfs_search_super_root(struct the_nilfs *nilfs,

			    struct nilfs_recovery_info *ri)

{

	struct nilfs_segsum_info ssi;
@@ -801,11 +829,10 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, 
	/* Read ahead segment */

	b = seg_start;

	while (b <= seg_end)

		sb_breadahead(sbi->s_super, b++);

		__breadahead(nilfs->ns_bdev, b++, nilfs->ns_blocksize);



	for (;;) {

		/* Load segment summary */

		ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);

		ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi);

		if (ret) {

			if (ret == NILFS_SEG_FAIL_IO)

				goto failed;
@@ -836,7 +863,8 @@ int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, 
		if (pseg_start == seg_start) {

			nilfs_get_segment_range(nilfs, nextnum, &b, &end);

			while (b <= end)

				sb_breadahead(sbi->s_super, b++);

				__breadahead(nilfs->ns_bdev, b++,

					     nilfs->ns_blocksize);

		}

		if (!NILFS_SEG_HAS_SR(&ssi)) {

			if (!ri->ri_lsegs_start && NILFS_SEG_LOGBGN(&ssi)) {

fs/nilfs2/segment.h

+2 −2
Original line number Diff line number Diff line
@@ -234,9 +234,9 @@ extern int nilfs_attach_segment_constructor(struct nilfs_sb_info *); 
extern void nilfs_detach_segment_constructor(struct nilfs_sb_info *);



/* recovery.c */

extern int nilfs_read_super_root_block(struct super_block *, sector_t,

extern int nilfs_read_super_root_block(struct the_nilfs *, sector_t,

				       struct buffer_head **, int);

extern int nilfs_search_super_root(struct the_nilfs *, struct nilfs_sb_info *,

extern int nilfs_search_super_root(struct the_nilfs *,

				   struct nilfs_recovery_info *);

extern int nilfs_recover_logical_segments(struct the_nilfs *,

					  struct nilfs_sb_info *,

fs/nilfs2/the_nilfs.c

+4 −5
Original line number Diff line number Diff line
@@ -159,8 +159,7 @@ void put_nilfs(struct the_nilfs *nilfs) 
	kfree(nilfs);

}



static int nilfs_load_super_root(struct the_nilfs *nilfs,

				 struct nilfs_sb_info *sbi, sector_t sr_block)

static int nilfs_load_super_root(struct the_nilfs *nilfs, sector_t sr_block)

{

	struct buffer_head *bh_sr;

	struct nilfs_super_root *raw_sr;
@@ -169,7 +168,7 @@ static int nilfs_load_super_root(struct the_nilfs *nilfs, 
	unsigned inode_size;

	int err;



	err = nilfs_read_super_root_block(sbi->s_super, sr_block, &bh_sr, 1);

	err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1);

	if (unlikely(err))

		return err;
@@ -285,13 +284,13 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) 


	nilfs_init_recovery_info(&ri);



	err = nilfs_search_super_root(nilfs, sbi, &ri);

	err = nilfs_search_super_root(nilfs, &ri);

	if (unlikely(err)) {

		printk(KERN_ERR "NILFS: error searching super root.\n");

		goto failed;

	}



	err = nilfs_load_super_root(nilfs, sbi, ri.ri_super_root);

	err = nilfs_load_super_root(nilfs, ri.ri_super_root);

	if (unlikely(err)) {

		printk(KERN_ERR "NILFS: error loading super root.\n");

		goto failed;

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