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![Christoph Hellwig](/assets/img/avatar_default.png)
This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
525 lines
14 KiB
C
525 lines
14 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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time_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 (bio == NULL) {
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while (!bio && (nr_vecs >>= 1))
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bio = bio_alloc(GFP_NOIO, nr_vecs);
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}
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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_PAGES;
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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);
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) {
|
|
res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);
|
|
if (unlikely(res))
|
|
goto failed_bio;
|
|
}
|
|
|
|
list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
|
|
res = nilfs_segbuf_submit_bh(segbuf, &wi, bh, REQ_OP_WRITE);
|
|
if (unlikely(res))
|
|
goto failed_bio;
|
|
}
|
|
|
|
if (wi.bio) {
|
|
/*
|
|
* Last BIO is always sent through the following
|
|
* submission.
|
|
*/
|
|
res = nilfs_segbuf_submit_bio(segbuf, &wi, REQ_OP_WRITE,
|
|
REQ_SYNC);
|
|
}
|
|
|
|
failed_bio:
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* nilfs_segbuf_wait - wait for completion of requested BIOs
|
|
* @segbuf: segment buffer
|
|
*
|
|
* Return Value: On Success, 0 is returned. On Error, one of the following
|
|
* negative error code is returned.
|
|
*
|
|
* %-EIO - I/O error
|
|
*/
|
|
static int nilfs_segbuf_wait(struct nilfs_segment_buffer *segbuf)
|
|
{
|
|
int err = 0;
|
|
|
|
if (!segbuf->sb_nbio)
|
|
return 0;
|
|
|
|
do {
|
|
wait_for_completion(&segbuf->sb_bio_event);
|
|
} while (--segbuf->sb_nbio > 0);
|
|
|
|
if (unlikely(atomic_read(&segbuf->sb_err) > 0)) {
|
|
nilfs_msg(segbuf->sb_super, KERN_ERR,
|
|
"I/O error writing log (start-blocknr=%llu, block-count=%lu) in segment %llu",
|
|
(unsigned long long)segbuf->sb_pseg_start,
|
|
segbuf->sb_sum.nblocks,
|
|
(unsigned long long)segbuf->sb_segnum);
|
|
err = -EIO;
|
|
}
|
|
return err;
|
|
}
|