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512 lines
13 KiB
512 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* segbuf.c - NILFS segment buffer |
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* |
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
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* |
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* Written by Ryusuke Konishi. |
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* |
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*/ |
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#include <linux/buffer_head.h> |
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#include <linux/writeback.h> |
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#include <linux/crc32.h> |
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#include <linux/backing-dev.h> |
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#include <linux/slab.h> |
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#include "page.h" |
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#include "segbuf.h" |
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struct nilfs_write_info { |
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struct the_nilfs *nilfs; |
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struct bio *bio; |
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int start, end; /* The region to be submitted */ |
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int rest_blocks; |
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int max_pages; |
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int nr_vecs; |
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sector_t blocknr; |
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}; |
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static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
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struct the_nilfs *nilfs); |
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static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf); |
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struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *sb) |
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{ |
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struct nilfs_segment_buffer *segbuf; |
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segbuf = kmem_cache_alloc(nilfs_segbuf_cachep, GFP_NOFS); |
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if (unlikely(!segbuf)) |
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return NULL; |
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segbuf->sb_super = sb; |
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INIT_LIST_HEAD(&segbuf->sb_list); |
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INIT_LIST_HEAD(&segbuf->sb_segsum_buffers); |
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INIT_LIST_HEAD(&segbuf->sb_payload_buffers); |
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segbuf->sb_super_root = NULL; |
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init_completion(&segbuf->sb_bio_event); |
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atomic_set(&segbuf->sb_err, 0); |
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segbuf->sb_nbio = 0; |
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return segbuf; |
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} |
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void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf) |
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{ |
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kmem_cache_free(nilfs_segbuf_cachep, segbuf); |
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} |
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void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum, |
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unsigned long offset, struct the_nilfs *nilfs) |
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{ |
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segbuf->sb_segnum = segnum; |
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nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start, |
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&segbuf->sb_fseg_end); |
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segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset; |
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segbuf->sb_rest_blocks = |
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segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; |
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} |
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/** |
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* nilfs_segbuf_map_cont - map a new log behind a given log |
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* @segbuf: new segment buffer |
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* @prev: segment buffer containing a log to be continued |
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*/ |
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void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, |
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struct nilfs_segment_buffer *prev) |
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{ |
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segbuf->sb_segnum = prev->sb_segnum; |
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segbuf->sb_fseg_start = prev->sb_fseg_start; |
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segbuf->sb_fseg_end = prev->sb_fseg_end; |
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segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks; |
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segbuf->sb_rest_blocks = |
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segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1; |
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} |
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void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf, |
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__u64 nextnum, struct the_nilfs *nilfs) |
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{ |
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segbuf->sb_nextnum = nextnum; |
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segbuf->sb_sum.next = nilfs_get_segment_start_blocknr(nilfs, nextnum); |
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} |
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int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *segbuf) |
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{ |
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struct buffer_head *bh; |
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bh = sb_getblk(segbuf->sb_super, |
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segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk); |
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if (unlikely(!bh)) |
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return -ENOMEM; |
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nilfs_segbuf_add_segsum_buffer(segbuf, bh); |
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return 0; |
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} |
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int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *segbuf, |
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struct buffer_head **bhp) |
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{ |
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struct buffer_head *bh; |
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bh = sb_getblk(segbuf->sb_super, |
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segbuf->sb_pseg_start + segbuf->sb_sum.nblocks); |
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if (unlikely(!bh)) |
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return -ENOMEM; |
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nilfs_segbuf_add_payload_buffer(segbuf, bh); |
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*bhp = bh; |
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return 0; |
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} |
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int nilfs_segbuf_reset(struct nilfs_segment_buffer *segbuf, unsigned int flags, |
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time64_t ctime, __u64 cno) |
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{ |
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int err; |
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segbuf->sb_sum.nblocks = segbuf->sb_sum.nsumblk = 0; |
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err = nilfs_segbuf_extend_segsum(segbuf); |
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if (unlikely(err)) |
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return err; |
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segbuf->sb_sum.flags = flags; |
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segbuf->sb_sum.sumbytes = sizeof(struct nilfs_segment_summary); |
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segbuf->sb_sum.nfinfo = segbuf->sb_sum.nfileblk = 0; |
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segbuf->sb_sum.ctime = ctime; |
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segbuf->sb_sum.cno = cno; |
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return 0; |
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} |
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/* |
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* Setup segment summary |
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*/ |
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void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *segbuf) |
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{ |
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struct nilfs_segment_summary *raw_sum; |
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struct buffer_head *bh_sum; |
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bh_sum = list_entry(segbuf->sb_segsum_buffers.next, |
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struct buffer_head, b_assoc_buffers); |
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raw_sum = (struct nilfs_segment_summary *)bh_sum->b_data; |
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raw_sum->ss_magic = cpu_to_le32(NILFS_SEGSUM_MAGIC); |
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raw_sum->ss_bytes = cpu_to_le16(sizeof(*raw_sum)); |
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raw_sum->ss_flags = cpu_to_le16(segbuf->sb_sum.flags); |
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raw_sum->ss_seq = cpu_to_le64(segbuf->sb_sum.seg_seq); |
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raw_sum->ss_create = cpu_to_le64(segbuf->sb_sum.ctime); |
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raw_sum->ss_next = cpu_to_le64(segbuf->sb_sum.next); |
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raw_sum->ss_nblocks = cpu_to_le32(segbuf->sb_sum.nblocks); |
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raw_sum->ss_nfinfo = cpu_to_le32(segbuf->sb_sum.nfinfo); |
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raw_sum->ss_sumbytes = cpu_to_le32(segbuf->sb_sum.sumbytes); |
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raw_sum->ss_pad = 0; |
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raw_sum->ss_cno = cpu_to_le64(segbuf->sb_sum.cno); |
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} |
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/* |
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* CRC calculation routines |
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*/ |
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static void |
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nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *segbuf, u32 seed) |
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{ |
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struct buffer_head *bh; |
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struct nilfs_segment_summary *raw_sum; |
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unsigned long size, bytes = segbuf->sb_sum.sumbytes; |
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u32 crc; |
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bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, |
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b_assoc_buffers); |
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raw_sum = (struct nilfs_segment_summary *)bh->b_data; |
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size = min_t(unsigned long, bytes, bh->b_size); |
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crc = crc32_le(seed, |
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(unsigned char *)raw_sum + |
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sizeof(raw_sum->ss_datasum) + sizeof(raw_sum->ss_sumsum), |
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size - (sizeof(raw_sum->ss_datasum) + |
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sizeof(raw_sum->ss_sumsum))); |
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list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, |
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b_assoc_buffers) { |
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bytes -= size; |
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size = min_t(unsigned long, bytes, bh->b_size); |
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crc = crc32_le(crc, bh->b_data, size); |
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} |
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raw_sum->ss_sumsum = cpu_to_le32(crc); |
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} |
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static void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf, |
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u32 seed) |
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{ |
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struct buffer_head *bh; |
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struct nilfs_segment_summary *raw_sum; |
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void *kaddr; |
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u32 crc; |
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bh = list_entry(segbuf->sb_segsum_buffers.next, struct buffer_head, |
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b_assoc_buffers); |
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raw_sum = (struct nilfs_segment_summary *)bh->b_data; |
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crc = crc32_le(seed, |
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(unsigned char *)raw_sum + sizeof(raw_sum->ss_datasum), |
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bh->b_size - sizeof(raw_sum->ss_datasum)); |
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list_for_each_entry_continue(bh, &segbuf->sb_segsum_buffers, |
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b_assoc_buffers) { |
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crc = crc32_le(crc, bh->b_data, bh->b_size); |
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} |
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list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
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kaddr = kmap_atomic(bh->b_page); |
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crc = crc32_le(crc, kaddr + bh_offset(bh), bh->b_size); |
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kunmap_atomic(kaddr); |
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} |
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raw_sum->ss_datasum = cpu_to_le32(crc); |
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} |
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static void |
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nilfs_segbuf_fill_in_super_root_crc(struct nilfs_segment_buffer *segbuf, |
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u32 seed) |
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{ |
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struct nilfs_super_root *raw_sr; |
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struct the_nilfs *nilfs = segbuf->sb_super->s_fs_info; |
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unsigned int srsize; |
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u32 crc; |
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raw_sr = (struct nilfs_super_root *)segbuf->sb_super_root->b_data; |
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srsize = NILFS_SR_BYTES(nilfs->ns_inode_size); |
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crc = crc32_le(seed, |
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(unsigned char *)raw_sr + sizeof(raw_sr->sr_sum), |
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srsize - sizeof(raw_sr->sr_sum)); |
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raw_sr->sr_sum = cpu_to_le32(crc); |
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} |
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static void nilfs_release_buffers(struct list_head *list) |
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{ |
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struct buffer_head *bh, *n; |
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list_for_each_entry_safe(bh, n, list, b_assoc_buffers) { |
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list_del_init(&bh->b_assoc_buffers); |
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brelse(bh); |
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} |
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} |
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static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) |
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{ |
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nilfs_release_buffers(&segbuf->sb_segsum_buffers); |
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nilfs_release_buffers(&segbuf->sb_payload_buffers); |
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segbuf->sb_super_root = NULL; |
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} |
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/* |
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* Iterators for segment buffers |
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*/ |
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void nilfs_clear_logs(struct list_head *logs) |
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{ |
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struct nilfs_segment_buffer *segbuf; |
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list_for_each_entry(segbuf, logs, sb_list) |
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nilfs_segbuf_clear(segbuf); |
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} |
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void nilfs_truncate_logs(struct list_head *logs, |
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struct nilfs_segment_buffer *last) |
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{ |
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struct nilfs_segment_buffer *n, *segbuf; |
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segbuf = list_prepare_entry(last, logs, sb_list); |
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list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) { |
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list_del_init(&segbuf->sb_list); |
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nilfs_segbuf_clear(segbuf); |
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nilfs_segbuf_free(segbuf); |
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} |
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} |
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int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs) |
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{ |
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struct nilfs_segment_buffer *segbuf; |
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int ret = 0; |
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list_for_each_entry(segbuf, logs, sb_list) { |
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ret = nilfs_segbuf_write(segbuf, nilfs); |
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if (ret) |
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break; |
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} |
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return ret; |
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} |
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int nilfs_wait_on_logs(struct list_head *logs) |
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{ |
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struct nilfs_segment_buffer *segbuf; |
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int err, ret = 0; |
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list_for_each_entry(segbuf, logs, sb_list) { |
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err = nilfs_segbuf_wait(segbuf); |
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if (err && !ret) |
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ret = err; |
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} |
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return ret; |
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} |
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/** |
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* nilfs_add_checksums_on_logs - add checksums on the logs |
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* @logs: list of segment buffers storing target logs |
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* @seed: checksum seed value |
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*/ |
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void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed) |
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{ |
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struct nilfs_segment_buffer *segbuf; |
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list_for_each_entry(segbuf, logs, sb_list) { |
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if (segbuf->sb_super_root) |
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nilfs_segbuf_fill_in_super_root_crc(segbuf, seed); |
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nilfs_segbuf_fill_in_segsum_crc(segbuf, seed); |
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nilfs_segbuf_fill_in_data_crc(segbuf, seed); |
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} |
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} |
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/* |
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* BIO operations |
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*/ |
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static void nilfs_end_bio_write(struct bio *bio) |
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{ |
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struct nilfs_segment_buffer *segbuf = bio->bi_private; |
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if (bio->bi_status) |
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atomic_inc(&segbuf->sb_err); |
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bio_put(bio); |
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complete(&segbuf->sb_bio_event); |
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} |
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static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, |
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struct nilfs_write_info *wi, int mode, |
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int mode_flags) |
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{ |
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struct bio *bio = wi->bio; |
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int err; |
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if (segbuf->sb_nbio > 0 && |
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bdi_write_congested(segbuf->sb_super->s_bdi)) { |
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wait_for_completion(&segbuf->sb_bio_event); |
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segbuf->sb_nbio--; |
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if (unlikely(atomic_read(&segbuf->sb_err))) { |
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bio_put(bio); |
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err = -EIO; |
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goto failed; |
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} |
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} |
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bio->bi_end_io = nilfs_end_bio_write; |
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bio->bi_private = segbuf; |
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bio_set_op_attrs(bio, mode, mode_flags); |
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submit_bio(bio); |
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segbuf->sb_nbio++; |
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wi->bio = NULL; |
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wi->rest_blocks -= wi->end - wi->start; |
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wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); |
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wi->start = wi->end; |
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return 0; |
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failed: |
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wi->bio = NULL; |
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return err; |
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} |
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/** |
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* nilfs_alloc_seg_bio - allocate a new bio for writing log |
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* @nilfs: nilfs object |
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* @start: start block number of the bio |
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* @nr_vecs: request size of page vector. |
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* |
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* Return Value: On success, pointer to the struct bio is returned. |
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* On error, NULL is returned. |
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*/ |
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static struct bio *nilfs_alloc_seg_bio(struct the_nilfs *nilfs, sector_t start, |
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int nr_vecs) |
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{ |
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struct bio *bio; |
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bio = bio_alloc(GFP_NOIO, nr_vecs); |
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if (likely(bio)) { |
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bio_set_dev(bio, nilfs->ns_bdev); |
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bio->bi_iter.bi_sector = |
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start << (nilfs->ns_blocksize_bits - 9); |
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} |
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return bio; |
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} |
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static void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *segbuf, |
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struct nilfs_write_info *wi) |
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{ |
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wi->bio = NULL; |
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wi->rest_blocks = segbuf->sb_sum.nblocks; |
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wi->max_pages = BIO_MAX_VECS; |
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wi->nr_vecs = min(wi->max_pages, wi->rest_blocks); |
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wi->start = wi->end = 0; |
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wi->blocknr = segbuf->sb_pseg_start; |
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} |
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static int nilfs_segbuf_submit_bh(struct nilfs_segment_buffer *segbuf, |
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struct nilfs_write_info *wi, |
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struct buffer_head *bh, int mode) |
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{ |
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int len, err; |
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BUG_ON(wi->nr_vecs <= 0); |
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repeat: |
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if (!wi->bio) { |
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wi->bio = nilfs_alloc_seg_bio(wi->nilfs, wi->blocknr + wi->end, |
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wi->nr_vecs); |
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if (unlikely(!wi->bio)) |
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return -ENOMEM; |
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} |
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len = bio_add_page(wi->bio, bh->b_page, bh->b_size, bh_offset(bh)); |
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if (len == bh->b_size) { |
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wi->end++; |
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return 0; |
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} |
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/* bio is FULL */ |
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err = nilfs_segbuf_submit_bio(segbuf, wi, mode, 0); |
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/* never submit current bh */ |
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if (likely(!err)) |
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goto repeat; |
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return err; |
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} |
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/** |
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* nilfs_segbuf_write - submit write requests of a log |
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* @segbuf: buffer storing a log to be written |
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* @nilfs: nilfs object |
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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 code is returned. |
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* |
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* %-EIO - I/O error |
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* |
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* %-ENOMEM - Insufficient memory available. |
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*/ |
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static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf, |
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struct the_nilfs *nilfs) |
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{ |
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struct nilfs_write_info wi; |
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struct buffer_head *bh; |
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int res = 0; |
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wi.nilfs = nilfs; |
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nilfs_segbuf_prepare_write(segbuf, &wi); |
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list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { |
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res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE); |
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if (unlikely(res)) |
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goto failed_bio; |
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} |
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list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
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res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE); |
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if (unlikely(res)) |
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goto failed_bio; |
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} |
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if (wi.bio) { |
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/* |
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* Last BIO is always sent through the following |
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* submission. |
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*/ |
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res = nilfs_segbuf_submit_bio(segbuf, &wi, REQ_OP_WRITE, |
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REQ_SYNC); |
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} |
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failed_bio: |
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return res; |
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} |
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|
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/** |
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* nilfs_segbuf_wait - wait for completion of requested BIOs |
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* @segbuf: segment buffer |
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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 code is returned. |
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* |
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* %-EIO - I/O error |
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*/ |
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static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf) |
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{ |
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int err = 0; |
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|
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if (!segbuf->sb_nbio) |
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return 0; |
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do { |
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wait_for_completion(&segbuf->sb_bio_event); |
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} while (--segbuf->sb_nbio > 0); |
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if (unlikely(atomic_read(&segbuf->sb_err) > 0)) { |
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nilfs_err(segbuf->sb_super, |
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"I/O error writing log (start-blocknr=%llu, block-count=%lu) in segment %llu", |
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(unsigned long long)segbuf->sb_pseg_start, |
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segbuf->sb_sum.nblocks, |
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(unsigned long long)segbuf->sb_segnum); |
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err = -EIO; |
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} |
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return err; |
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}
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