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39a9dcca61
When nilfs returned -EIO as an error code, it's not always clear if it came from the underlying block device or not. This will mend the issue by having low level I/O routines of nilfs output an error message when they detected an I/O error. Link: http://lkml.kernel.org/r/1464875891-5443-7-git-send-email-konishi.ryusuke@lab.ntt.co.jp Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
201 lines
5.6 KiB
C
201 lines
5.6 KiB
C
/*
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* gcinode.c - dummy inodes to buffer blocks for garbage collection
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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 Seiji Kihara, Amagai Yoshiji, and Ryusuke Konishi.
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* Revised by Ryusuke Konishi.
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*
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*/
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/*
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* This file adds the cache of on-disk blocks to be moved in garbage
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* collection. The disk blocks are held with dummy inodes (called
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* gcinodes), and this file provides lookup function of the dummy
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* inodes and their buffer read function.
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*
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* Buffers and pages held by the dummy inodes will be released each
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* time after they are copied to a new log. Dirty blocks made on the
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* current generation and the blocks to be moved by GC never overlap
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* because the dirty blocks make a new generation; they rather must be
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* written individually.
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*/
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#include <linux/buffer_head.h>
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#include <linux/mpage.h>
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#include <linux/hash.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include "nilfs.h"
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#include "btree.h"
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#include "btnode.h"
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#include "page.h"
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#include "mdt.h"
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#include "dat.h"
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#include "ifile.h"
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/*
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* nilfs_gccache_submit_read_data() - add data buffer and submit read request
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* @inode - gc inode
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* @blkoff - dummy offset treated as the key for the page cache
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* @pbn - physical block number of the block
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* @vbn - virtual block number of the block, 0 for non-virtual block
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* @out_bh - indirect pointer to a buffer_head struct to receive the results
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*
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* Description: nilfs_gccache_submit_read_data() registers the data buffer
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* specified by @pbn to the GC pagecache with the key @blkoff.
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* This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the 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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* %-ENOMEM - Insufficient amount of memory available.
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*
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* %-ENOENT - The block specified with @pbn does not exist.
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*/
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int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
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sector_t pbn, __u64 vbn,
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struct buffer_head **out_bh)
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{
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struct buffer_head *bh;
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int err;
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bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
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if (unlikely(!bh))
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return -ENOMEM;
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if (buffer_uptodate(bh))
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goto out;
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if (pbn == 0) {
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struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
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err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);
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if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
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brelse(bh);
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goto failed;
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}
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}
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lock_buffer(bh);
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if (buffer_uptodate(bh)) {
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unlock_buffer(bh);
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goto out;
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}
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if (!buffer_mapped(bh)) {
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bh->b_bdev = inode->i_sb->s_bdev;
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set_buffer_mapped(bh);
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}
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bh->b_blocknr = pbn;
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bh->b_end_io = end_buffer_read_sync;
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get_bh(bh);
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submit_bh(REQ_OP_READ, 0, bh);
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if (vbn)
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bh->b_blocknr = vbn;
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out:
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err = 0;
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*out_bh = bh;
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failed:
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unlock_page(bh->b_page);
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put_page(bh->b_page);
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return err;
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}
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/*
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* nilfs_gccache_submit_read_node() - add node buffer and submit read request
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* @inode - gc inode
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* @pbn - physical block number for the block
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* @vbn - virtual block number for the block
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* @out_bh - indirect pointer to a buffer_head struct to receive the results
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*
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* Description: nilfs_gccache_submit_read_node() registers the node buffer
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* specified by @vbn to the GC pagecache. @pbn can be supplied by the
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* caller to avoid translation of the disk block address.
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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 amount of memory available.
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*/
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int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
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__u64 vbn, struct buffer_head **out_bh)
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{
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int ret;
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ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
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vbn ? : pbn, pbn, REQ_OP_READ, 0,
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out_bh, &pbn);
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if (ret == -EEXIST) /* internal code (cache hit) */
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ret = 0;
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return ret;
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}
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int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
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{
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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struct inode *inode = bh->b_page->mapping->host;
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nilfs_msg(inode->i_sb, KERN_ERR,
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"I/O error reading %s block for GC (ino=%lu, vblocknr=%llu)",
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buffer_nilfs_node(bh) ? "node" : "data",
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inode->i_ino, (unsigned long long)bh->b_blocknr);
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return -EIO;
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}
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if (buffer_dirty(bh))
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return -EEXIST;
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if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) {
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clear_buffer_uptodate(bh);
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return -EIO;
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}
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mark_buffer_dirty(bh);
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return 0;
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}
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int nilfs_init_gcinode(struct inode *inode)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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inode->i_mode = S_IFREG;
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mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
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inode->i_mapping->a_ops = &empty_aops;
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ii->i_flags = 0;
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nilfs_bmap_init_gc(ii->i_bmap);
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return 0;
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}
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/**
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* nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
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*/
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void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs)
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{
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struct list_head *head = &nilfs->ns_gc_inodes;
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struct nilfs_inode_info *ii;
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while (!list_empty(head)) {
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ii = list_first_entry(head, struct nilfs_inode_info, i_dirty);
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list_del_init(&ii->i_dirty);
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truncate_inode_pages(&ii->vfs_inode.i_data, 0);
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nilfs_btnode_cache_clear(&ii->i_btnode_cache);
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iput(&ii->vfs_inode);
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}
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}
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