forked from Minki/linux
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: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi
parent
92c60ccaf3
commit
8b94025c00
@ -110,8 +110,8 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi,
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}
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/**
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* calc_crc_cont - check CRC of blocks continuously
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* @sbi: nilfs_sb_info
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* nilfs_compute_checksum - compute checksum of blocks continuously
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* @nilfs: nilfs object
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* @bhs: buffer head of start block
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* @sum: place to store result
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* @offset: offset bytes in the first block
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@ -119,23 +119,25 @@ static void store_segsum_info(struct nilfs_segsum_info *ssi,
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* @start: DBN of start block
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* @nblock: number of blocks to be checked
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*/
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static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,
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u32 *sum, unsigned long offset, u64 check_bytes,
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sector_t start, unsigned long nblock)
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static int nilfs_compute_checksum(struct the_nilfs *nilfs,
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struct buffer_head *bhs, u32 *sum,
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unsigned long offset, u64 check_bytes,
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sector_t start, unsigned long nblock)
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{
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unsigned long blocksize = sbi->s_super->s_blocksize;
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unsigned int blocksize = nilfs->ns_blocksize;
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unsigned long size;
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u32 crc;
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BUG_ON(offset >= blocksize);
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check_bytes -= offset;
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size = min_t(u64, check_bytes, blocksize - offset);
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crc = crc32_le(sbi->s_nilfs->ns_crc_seed,
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crc = crc32_le(nilfs->ns_crc_seed,
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(unsigned char *)bhs->b_data + offset, size);
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if (--nblock > 0) {
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do {
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struct buffer_head *bh
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= sb_bread(sbi->s_super, ++start);
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struct buffer_head *bh;
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bh = __bread(nilfs->ns_bdev, ++start, blocksize);
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if (!bh)
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return -EIO;
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check_bytes -= size;
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@ -150,12 +152,12 @@ static int calc_crc_cont(struct nilfs_sb_info *sbi, struct buffer_head *bhs,
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/**
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* nilfs_read_super_root_block - read super root block
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* @sb: super_block
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* @nilfs: nilfs object
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* @sr_block: disk block number of the super root block
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* @pbh: address of a buffer_head pointer to return super root buffer
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* @check: CRC check flag
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*/
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int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
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int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
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struct buffer_head **pbh, int check)
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{
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struct buffer_head *bh_sr;
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@ -164,7 +166,7 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
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int ret;
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*pbh = NULL;
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bh_sr = sb_bread(sb, sr_block);
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bh_sr = __bread(nilfs->ns_bdev, sr_block, nilfs->ns_blocksize);
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if (unlikely(!bh_sr)) {
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ret = NILFS_SEG_FAIL_IO;
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goto failed;
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@ -174,12 +176,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
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if (check) {
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unsigned bytes = le16_to_cpu(sr->sr_bytes);
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if (bytes == 0 || bytes > sb->s_blocksize) {
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if (bytes == 0 || bytes > nilfs->ns_blocksize) {
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ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
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goto failed_bh;
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}
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if (calc_crc_cont(NILFS_SB(sb), bh_sr, &crc,
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sizeof(sr->sr_sum), bytes, sr_block, 1)) {
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if (nilfs_compute_checksum(
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nilfs, bh_sr, &crc, sizeof(sr->sr_sum), bytes,
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sr_block, 1)) {
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ret = NILFS_SEG_FAIL_IO;
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goto failed_bh;
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}
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@ -200,13 +203,13 @@ int nilfs_read_super_root_block(struct super_block *sb, sector_t sr_block,
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/**
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* load_segment_summary - read segment summary of the specified partial segment
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* @sbi: nilfs_sb_info
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* @nilfs: nilfs object
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* @pseg_start: start disk block number of partial segment
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* @seg_seq: sequence number requested
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* @ssi: pointer to nilfs_segsum_info struct to store information
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*/
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static int
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load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
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load_segment_summary(struct the_nilfs *nilfs, sector_t pseg_start,
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u64 seg_seq, struct nilfs_segsum_info *ssi)
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{
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struct buffer_head *bh_sum;
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@ -215,7 +218,7 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
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u32 crc;
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int ret = NILFS_SEG_FAIL_IO;
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bh_sum = sb_bread(sbi->s_super, pseg_start);
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bh_sum = __bread(nilfs->ns_bdev, pseg_start, nilfs->ns_blocksize);
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if (!bh_sum)
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goto out;
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@ -226,22 +229,21 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
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ret = NILFS_SEG_FAIL_MAGIC;
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goto failed;
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}
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store_segsum_info(ssi, sum, sbi->s_super->s_blocksize);
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store_segsum_info(ssi, sum, nilfs->ns_blocksize);
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if (seg_seq != ssi->seg_seq) {
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ret = NILFS_SEG_FAIL_SEQ;
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goto failed;
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}
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nblock = ssi->nblocks;
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if (unlikely(nblock == 0 ||
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nblock > sbi->s_nilfs->ns_blocks_per_segment)) {
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if (unlikely(nblock == 0 || nblock > nilfs->ns_blocks_per_segment)) {
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/* This limits the number of blocks read in the CRC check */
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ret = NILFS_SEG_FAIL_CONSISTENCY;
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goto failed;
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}
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if (calc_crc_cont(sbi, bh_sum, &crc, sizeof(sum->ss_datasum),
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((u64)nblock << sbi->s_super->s_blocksize_bits),
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pseg_start, nblock)) {
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if (nilfs_compute_checksum(nilfs, bh_sum, &crc, sizeof(sum->ss_datasum),
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((u64)nblock << nilfs->ns_blocksize_bits),
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pseg_start, nblock)) {
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ret = NILFS_SEG_FAIL_IO;
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goto failed;
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}
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@ -255,8 +257,16 @@ load_segment_summary(struct nilfs_sb_info *sbi, sector_t pseg_start,
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return ret;
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}
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static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
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unsigned int *offset, unsigned int bytes)
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/**
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* nilfs_read_summary_info - read an item on summary blocks of a log
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* @nilfs: nilfs object
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* @pbh: the current buffer head on summary blocks [in, out]
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* @offset: the current byte offset on summary blocks [in, out]
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* @bytes: byte size of the item to be read
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*/
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static void *nilfs_read_summary_info(struct the_nilfs *nilfs,
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struct buffer_head **pbh,
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unsigned int *offset, unsigned int bytes)
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{
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void *ptr;
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sector_t blocknr;
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@ -265,7 +275,8 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
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if (bytes > (*pbh)->b_size - *offset) {
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blocknr = (*pbh)->b_blocknr;
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brelse(*pbh);
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*pbh = sb_bread(sb, blocknr + 1);
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*pbh = __bread(nilfs->ns_bdev, blocknr + 1,
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nilfs->ns_blocksize);
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if (unlikely(!*pbh))
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return NULL;
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*offset = 0;
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@ -275,9 +286,18 @@ static void *segsum_get(struct super_block *sb, struct buffer_head **pbh,
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return ptr;
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}
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static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,
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unsigned int *offset, unsigned int bytes,
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unsigned long count)
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/**
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* nilfs_skip_summary_info - skip items on summary blocks of a log
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* @nilfs: nilfs object
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* @pbh: the current buffer head on summary blocks [in, out]
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* @offset: the current byte offset on summary blocks [in, out]
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* @bytes: byte size of the item to be skipped
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* @count: number of items to be skipped
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*/
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static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
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struct buffer_head **pbh,
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unsigned int *offset, unsigned int bytes,
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unsigned long count)
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{
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unsigned int rest_item_in_current_block
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= ((*pbh)->b_size - *offset) / bytes;
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@ -294,26 +314,33 @@ static void segsum_skip(struct super_block *sb, struct buffer_head **pbh,
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*offset = bytes * (count - (bcnt - 1) * nitem_per_block);
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brelse(*pbh);
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*pbh = sb_bread(sb, blocknr + bcnt);
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*pbh = __bread(nilfs->ns_bdev, blocknr + bcnt,
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nilfs->ns_blocksize);
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}
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}
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static int
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collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
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struct nilfs_segsum_info *ssi,
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struct list_head *head)
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/**
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* nilfs_scan_dsync_log - get block information of a log written for data sync
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* @nilfs: nilfs object
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* @start_blocknr: start block number of the log
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* @ssi: log summary information
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* @head: list head to add nilfs_recovery_block struct
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*/
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static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,
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struct nilfs_segsum_info *ssi,
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struct list_head *head)
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{
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struct buffer_head *bh;
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unsigned int offset;
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unsigned long nfinfo = ssi->nfinfo;
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sector_t blocknr = sum_blocknr + ssi->nsumblk;
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sector_t blocknr = start_blocknr + ssi->nsumblk;
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ino_t ino;
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int err = -EIO;
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if (!nfinfo)
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return 0;
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bh = sb_bread(sbi->s_super, sum_blocknr);
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bh = __bread(nilfs->ns_bdev, start_blocknr, nilfs->ns_blocksize);
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if (unlikely(!bh))
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goto out;
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@ -323,7 +350,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
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unsigned long nblocks, ndatablk, nnodeblk;
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struct nilfs_finfo *finfo;
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finfo = segsum_get(sbi->s_super, &bh, &offset, sizeof(*finfo));
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finfo = nilfs_read_summary_info(nilfs, &bh, &offset,
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sizeof(*finfo));
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if (unlikely(!finfo))
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goto out;
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@ -336,8 +364,8 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
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struct nilfs_recovery_block *rb;
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struct nilfs_binfo_v *binfo;
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binfo = segsum_get(sbi->s_super, &bh, &offset,
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sizeof(*binfo));
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binfo = nilfs_read_summary_info(nilfs, &bh, &offset,
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sizeof(*binfo));
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if (unlikely(!binfo))
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goto out;
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@ -355,9 +383,9 @@ collect_blocks_from_segsum(struct nilfs_sb_info *sbi, sector_t sum_blocknr,
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}
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if (--nfinfo == 0)
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break;
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blocknr += nnodeblk; /* always 0 for the data sync segments */
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segsum_skip(sbi->s_super, &bh, &offset, sizeof(__le64),
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nnodeblk);
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blocknr += nnodeblk; /* always 0 for data sync logs */
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nilfs_skip_summary_info(nilfs, &bh, &offset, sizeof(__le64),
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nnodeblk);
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if (unlikely(!bh))
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goto out;
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}
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@ -467,14 +495,14 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
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return err;
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}
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static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,
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static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
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struct nilfs_recovery_block *rb,
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struct page *page)
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{
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struct buffer_head *bh_org;
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void *kaddr;
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bh_org = sb_bread(sbi->s_super, rb->blocknr);
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bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);
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if (unlikely(!bh_org))
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return -EIO;
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@ -485,13 +513,14 @@ static int nilfs_recovery_copy_block(struct nilfs_sb_info *sbi,
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return 0;
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}
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static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
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struct list_head *head,
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unsigned long *nr_salvaged_blocks)
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static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
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struct nilfs_sb_info *sbi,
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struct list_head *head,
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unsigned long *nr_salvaged_blocks)
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{
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struct inode *inode;
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struct nilfs_recovery_block *rb, *n;
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unsigned blocksize = sbi->s_super->s_blocksize;
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unsigned blocksize = nilfs->ns_blocksize;
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struct page *page;
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loff_t pos;
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int err = 0, err2 = 0;
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@ -511,7 +540,7 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
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if (unlikely(err))
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goto failed_inode;
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err = nilfs_recovery_copy_block(sbi, rb, page);
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err = nilfs_recovery_copy_block(nilfs, rb, page);
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if (unlikely(err))
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goto failed_page;
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@ -551,8 +580,8 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
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/**
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* nilfs_do_roll_forward - salvage logical segments newer than the latest
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* checkpoint
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* @nilfs: nilfs object
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* @sbi: nilfs_sb_info
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* @nilfs: the_nilfs
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* @ri: pointer to a nilfs_recovery_info
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*/
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static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
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@ -582,7 +611,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
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while (segnum != ri->ri_segnum || pseg_start <= ri->ri_pseg_start) {
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ret = load_segment_summary(sbi, pseg_start, seg_seq, &ssi);
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ret = load_segment_summary(nilfs, pseg_start, seg_seq, &ssi);
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if (ret) {
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if (ret == NILFS_SEG_FAIL_IO) {
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err = -EIO;
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@ -610,13 +639,14 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
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if (!NILFS_SEG_DSYNC(&ssi))
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goto confused;
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err = collect_blocks_from_segsum(
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sbi, pseg_start, &ssi, &dsync_blocks);
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err = nilfs_scan_dsync_log(nilfs, pseg_start, &ssi,
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&dsync_blocks);
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if (unlikely(err))
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goto failed;
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if (NILFS_SEG_LOGEND(&ssi)) {
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err = recover_dsync_blocks(
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sbi, &dsync_blocks, &nsalvaged_blocks);
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err = nilfs_recover_dsync_blocks(
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nilfs, sbi, &dsync_blocks,
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&nsalvaged_blocks);
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if (unlikely(err))
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goto failed;
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state = RF_INIT_ST;
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@ -653,7 +683,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
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}
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out:
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dispose_recovery_list(&dsync_blocks);
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nilfs_detach_writer(sbi->s_nilfs, sbi);
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nilfs_detach_writer(nilfs, sbi);
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return err;
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confused:
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@ -667,7 +697,6 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
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}
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static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
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struct nilfs_sb_info *sbi,
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struct nilfs_recovery_info *ri)
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{
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struct buffer_head *bh;
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@ -677,7 +706,7 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
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nilfs_get_segnum_of_block(nilfs, ri->ri_super_root))
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return;
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bh = sb_getblk(sbi->s_super, ri->ri_lsegs_start);
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bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);
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BUG_ON(!bh);
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memset(bh->b_data, 0, bh->b_size);
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set_buffer_dirty(bh);
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@ -751,7 +780,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
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goto failed;
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}
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nilfs_finish_roll_forward(nilfs, sbi, ri);
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nilfs_finish_roll_forward(nilfs, ri);
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}
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failed:
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@ -762,7 +791,6 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
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/**
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* nilfs_search_super_root - search the latest valid super root
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* @nilfs: the_nilfs
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* @sbi: nilfs_sb_info
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* @ri: pointer to a nilfs_recovery_info struct to store search results.
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*
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* nilfs_search_super_root() looks for the latest super-root from a partial
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@ -776,7 +804,7 @@ int nilfs_recover_logical_segments(struct the_nilfs *nilfs,
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*
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* %-EIO - I/O error
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*/
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int nilfs_search_super_root(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi,
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int nilfs_search_super_root(struct the_nilfs *nilfs,
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struct nilfs_recovery_info *ri)
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{
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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)) {
|
||||
|
||||
@ -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 *,
|
||||
|
||||
@ -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;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user