mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
7b9c0976ac
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Cong Wang <amwang@redhat.com>
590 lines
14 KiB
C
590 lines
14 KiB
C
/*
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* mdt.c - meta data file for NILFS
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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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/mm.h>
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#include <linux/writeback.h>
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#include <linux/backing-dev.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include "nilfs.h"
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#include "btnode.h"
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#include "segment.h"
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#include "page.h"
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#include "mdt.h"
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#define NILFS_MDT_MAX_RA_BLOCKS (16 - 1)
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static int
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nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block,
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struct buffer_head *bh,
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void (*init_block)(struct inode *,
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struct buffer_head *, void *))
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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void *kaddr;
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int ret;
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/* Caller exclude read accesses using page lock */
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/* set_buffer_new(bh); */
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bh->b_blocknr = 0;
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ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh);
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if (unlikely(ret))
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return ret;
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set_buffer_mapped(bh);
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kaddr = kmap_atomic(bh->b_page);
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memset(kaddr + bh_offset(bh), 0, 1 << inode->i_blkbits);
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if (init_block)
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init_block(inode, bh, kaddr);
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flush_dcache_page(bh->b_page);
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kunmap_atomic(kaddr);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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nilfs_mdt_mark_dirty(inode);
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return 0;
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}
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static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
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struct buffer_head **out_bh,
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void (*init_block)(struct inode *,
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struct buffer_head *,
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void *))
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{
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struct super_block *sb = inode->i_sb;
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struct nilfs_transaction_info ti;
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struct buffer_head *bh;
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int err;
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nilfs_transaction_begin(sb, &ti, 0);
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err = -ENOMEM;
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bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0);
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if (unlikely(!bh))
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goto failed_unlock;
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err = -EEXIST;
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if (buffer_uptodate(bh))
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goto failed_bh;
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wait_on_buffer(bh);
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if (buffer_uptodate(bh))
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goto failed_bh;
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bh->b_bdev = sb->s_bdev;
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err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
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if (likely(!err)) {
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get_bh(bh);
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*out_bh = bh;
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}
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failed_bh:
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unlock_page(bh->b_page);
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page_cache_release(bh->b_page);
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brelse(bh);
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failed_unlock:
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if (likely(!err))
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err = nilfs_transaction_commit(sb);
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else
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nilfs_transaction_abort(sb);
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return err;
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}
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static int
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nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
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int mode, struct buffer_head **out_bh)
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{
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struct buffer_head *bh;
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__u64 blknum = 0;
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int ret = -ENOMEM;
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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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goto failed;
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ret = -EEXIST; /* internal code */
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if (buffer_uptodate(bh))
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goto out;
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if (mode == READA) {
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if (!trylock_buffer(bh)) {
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ret = -EBUSY;
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goto failed_bh;
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}
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} else /* mode == READ */
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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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ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum);
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if (unlikely(ret)) {
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unlock_buffer(bh);
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goto failed_bh;
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}
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map_bh(bh, inode->i_sb, (sector_t)blknum);
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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(mode, bh);
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ret = 0;
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out:
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get_bh(bh);
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*out_bh = bh;
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failed_bh:
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unlock_page(bh->b_page);
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page_cache_release(bh->b_page);
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brelse(bh);
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failed:
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return ret;
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}
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static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
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int readahead, struct buffer_head **out_bh)
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{
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struct buffer_head *first_bh, *bh;
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unsigned long blkoff;
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int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
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int err;
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err = nilfs_mdt_submit_block(inode, block, READ, &first_bh);
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if (err == -EEXIST) /* internal code */
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goto out;
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if (unlikely(err))
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goto failed;
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if (readahead) {
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blkoff = block + 1;
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for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
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err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);
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if (likely(!err || err == -EEXIST))
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brelse(bh);
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else if (err != -EBUSY)
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break;
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/* abort readahead if bmap lookup failed */
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if (!buffer_locked(first_bh))
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goto out_no_wait;
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}
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}
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wait_on_buffer(first_bh);
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out_no_wait:
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err = -EIO;
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if (!buffer_uptodate(first_bh))
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goto failed_bh;
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out:
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*out_bh = first_bh;
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return 0;
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failed_bh:
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brelse(first_bh);
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failed:
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return err;
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}
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/**
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* nilfs_mdt_get_block - read or create a buffer on meta data file.
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* @inode: inode of the meta data file
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* @blkoff: block offset
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* @create: create flag
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* @init_block: initializer used for newly allocated block
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* @out_bh: output of a pointer to the buffer_head
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*
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* nilfs_mdt_get_block() looks up the specified buffer and tries to create
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* a new buffer if @create is not zero. On success, the returned buffer is
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* assured to be either existing or formatted using a buffer lock on success.
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* @out_bh is substituted only when zero is returned.
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*
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* Return Value: On success, it returns 0. On error, the following negative
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* error code is returned.
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*
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* %-ENOMEM - Insufficient memory available.
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*
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* %-EIO - I/O error
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*
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* %-ENOENT - the specified block does not exist (hole block)
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*
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* %-EROFS - Read only filesystem (for create mode)
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*/
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int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create,
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void (*init_block)(struct inode *,
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struct buffer_head *, void *),
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struct buffer_head **out_bh)
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{
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int ret;
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/* Should be rewritten with merging nilfs_mdt_read_block() */
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retry:
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ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh);
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if (!create || ret != -ENOENT)
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return ret;
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ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block);
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if (unlikely(ret == -EEXIST)) {
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/* create = 0; */ /* limit read-create loop retries */
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goto retry;
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}
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return ret;
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}
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/**
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* nilfs_mdt_delete_block - make a hole on the meta data file.
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* @inode: inode of the meta data file
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* @block: block offset
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*
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* Return Value: On success, zero is returned.
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* On error, one of the following negative error code is returned.
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*
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* %-ENOMEM - Insufficient memory available.
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*
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* %-EIO - I/O error
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*/
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int nilfs_mdt_delete_block(struct inode *inode, unsigned long block)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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int err;
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err = nilfs_bmap_delete(ii->i_bmap, block);
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if (!err || err == -ENOENT) {
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nilfs_mdt_mark_dirty(inode);
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nilfs_mdt_forget_block(inode, block);
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}
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return err;
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}
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/**
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* nilfs_mdt_forget_block - discard dirty state and try to remove the page
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* @inode: inode of the meta data file
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* @block: block offset
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*
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* nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and
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* tries to release the page including the buffer from a page cache.
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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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* %-EBUSY - page has an active buffer.
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*
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* %-ENOENT - page cache has no page addressed by the offset.
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*/
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int nilfs_mdt_forget_block(struct inode *inode, unsigned long block)
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{
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pgoff_t index = (pgoff_t)block >>
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(PAGE_CACHE_SHIFT - inode->i_blkbits);
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struct page *page;
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unsigned long first_block;
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int ret = 0;
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int still_dirty;
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page = find_lock_page(inode->i_mapping, index);
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if (!page)
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return -ENOENT;
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wait_on_page_writeback(page);
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first_block = (unsigned long)index <<
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(PAGE_CACHE_SHIFT - inode->i_blkbits);
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if (page_has_buffers(page)) {
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struct buffer_head *bh;
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bh = nilfs_page_get_nth_block(page, block - first_block);
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nilfs_forget_buffer(bh);
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}
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still_dirty = PageDirty(page);
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unlock_page(page);
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page_cache_release(page);
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if (still_dirty ||
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invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0)
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ret = -EBUSY;
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return ret;
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}
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/**
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* nilfs_mdt_mark_block_dirty - mark a block on the meta data file dirty.
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* @inode: inode of the meta data file
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* @block: block offset
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*
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* Return Value: On success, it returns 0. On error, the following negative
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* error code is returned.
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*
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* %-ENOMEM - Insufficient memory available.
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*
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* %-EIO - I/O error
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*
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* %-ENOENT - the specified block does not exist (hole block)
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*/
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int nilfs_mdt_mark_block_dirty(struct inode *inode, unsigned long block)
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{
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struct buffer_head *bh;
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int err;
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err = nilfs_mdt_read_block(inode, block, 0, &bh);
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if (unlikely(err))
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return err;
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mark_buffer_dirty(bh);
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nilfs_mdt_mark_dirty(inode);
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brelse(bh);
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return 0;
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}
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int nilfs_mdt_fetch_dirty(struct inode *inode)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) {
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set_bit(NILFS_I_DIRTY, &ii->i_state);
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return 1;
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}
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return test_bit(NILFS_I_DIRTY, &ii->i_state);
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}
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static int
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nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
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{
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struct inode *inode;
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struct super_block *sb;
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int err = 0;
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redirty_page_for_writepage(wbc, page);
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unlock_page(page);
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inode = page->mapping->host;
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if (!inode)
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return 0;
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sb = inode->i_sb;
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if (wbc->sync_mode == WB_SYNC_ALL)
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err = nilfs_construct_segment(sb);
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else if (wbc->for_reclaim)
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nilfs_flush_segment(sb, inode->i_ino);
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return err;
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}
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static const struct address_space_operations def_mdt_aops = {
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.writepage = nilfs_mdt_write_page,
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};
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static const struct inode_operations def_mdt_iops;
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static const struct file_operations def_mdt_fops;
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int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz)
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{
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struct nilfs_mdt_info *mi;
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mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
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if (!mi)
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return -ENOMEM;
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init_rwsem(&mi->mi_sem);
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inode->i_private = mi;
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inode->i_mode = S_IFREG;
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mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
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inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
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inode->i_op = &def_mdt_iops;
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inode->i_fop = &def_mdt_fops;
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inode->i_mapping->a_ops = &def_mdt_aops;
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return 0;
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}
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void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size,
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unsigned header_size)
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{
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struct nilfs_mdt_info *mi = NILFS_MDT(inode);
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mi->mi_entry_size = entry_size;
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mi->mi_entries_per_block = (1 << inode->i_blkbits) / entry_size;
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mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
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}
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/**
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* nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
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* @inode: inode of the metadata file
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* @shadow: shadow mapping
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*/
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int nilfs_mdt_setup_shadow_map(struct inode *inode,
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struct nilfs_shadow_map *shadow)
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{
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struct nilfs_mdt_info *mi = NILFS_MDT(inode);
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struct backing_dev_info *bdi = inode->i_sb->s_bdi;
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INIT_LIST_HEAD(&shadow->frozen_buffers);
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address_space_init_once(&shadow->frozen_data);
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nilfs_mapping_init(&shadow->frozen_data, inode, bdi);
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address_space_init_once(&shadow->frozen_btnodes);
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nilfs_mapping_init(&shadow->frozen_btnodes, inode, bdi);
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mi->mi_shadow = shadow;
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return 0;
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}
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/**
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* nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map
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* @inode: inode of the metadata file
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*/
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int nilfs_mdt_save_to_shadow_map(struct inode *inode)
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{
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struct nilfs_mdt_info *mi = NILFS_MDT(inode);
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struct nilfs_inode_info *ii = NILFS_I(inode);
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struct nilfs_shadow_map *shadow = mi->mi_shadow;
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int ret;
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ret = nilfs_copy_dirty_pages(&shadow->frozen_data, inode->i_mapping);
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if (ret)
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goto out;
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ret = nilfs_copy_dirty_pages(&shadow->frozen_btnodes,
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&ii->i_btnode_cache);
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if (ret)
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goto out;
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nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store);
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out:
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return ret;
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}
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int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
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{
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struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
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struct buffer_head *bh_frozen;
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struct page *page;
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int blkbits = inode->i_blkbits;
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page = grab_cache_page(&shadow->frozen_data, bh->b_page->index);
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if (!page)
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return -ENOMEM;
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if (!page_has_buffers(page))
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create_empty_buffers(page, 1 << blkbits, 0);
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bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits);
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if (!buffer_uptodate(bh_frozen))
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nilfs_copy_buffer(bh_frozen, bh);
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if (list_empty(&bh_frozen->b_assoc_buffers)) {
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list_add_tail(&bh_frozen->b_assoc_buffers,
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&shadow->frozen_buffers);
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set_buffer_nilfs_redirected(bh);
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} else {
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brelse(bh_frozen); /* already frozen */
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}
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unlock_page(page);
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page_cache_release(page);
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return 0;
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}
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struct buffer_head *
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nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh)
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{
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struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow;
|
|
struct buffer_head *bh_frozen = NULL;
|
|
struct page *page;
|
|
int n;
|
|
|
|
page = find_lock_page(&shadow->frozen_data, bh->b_page->index);
|
|
if (page) {
|
|
if (page_has_buffers(page)) {
|
|
n = bh_offset(bh) >> inode->i_blkbits;
|
|
bh_frozen = nilfs_page_get_nth_block(page, n);
|
|
}
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
return bh_frozen;
|
|
}
|
|
|
|
static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow)
|
|
{
|
|
struct list_head *head = &shadow->frozen_buffers;
|
|
struct buffer_head *bh;
|
|
|
|
while (!list_empty(head)) {
|
|
bh = list_first_entry(head, struct buffer_head,
|
|
b_assoc_buffers);
|
|
list_del_init(&bh->b_assoc_buffers);
|
|
brelse(bh); /* drop ref-count to make it releasable */
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state
|
|
* @inode: inode of the metadata file
|
|
*/
|
|
void nilfs_mdt_restore_from_shadow_map(struct inode *inode)
|
|
{
|
|
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
struct nilfs_shadow_map *shadow = mi->mi_shadow;
|
|
|
|
down_write(&mi->mi_sem);
|
|
|
|
if (mi->mi_palloc_cache)
|
|
nilfs_palloc_clear_cache(inode);
|
|
|
|
nilfs_clear_dirty_pages(inode->i_mapping);
|
|
nilfs_copy_back_pages(inode->i_mapping, &shadow->frozen_data);
|
|
|
|
nilfs_clear_dirty_pages(&ii->i_btnode_cache);
|
|
nilfs_copy_back_pages(&ii->i_btnode_cache, &shadow->frozen_btnodes);
|
|
|
|
nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store);
|
|
|
|
up_write(&mi->mi_sem);
|
|
}
|
|
|
|
/**
|
|
* nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches
|
|
* @inode: inode of the metadata file
|
|
*/
|
|
void nilfs_mdt_clear_shadow_map(struct inode *inode)
|
|
{
|
|
struct nilfs_mdt_info *mi = NILFS_MDT(inode);
|
|
struct nilfs_shadow_map *shadow = mi->mi_shadow;
|
|
|
|
down_write(&mi->mi_sem);
|
|
nilfs_release_frozen_buffers(shadow);
|
|
truncate_inode_pages(&shadow->frozen_data, 0);
|
|
truncate_inode_pages(&shadow->frozen_btnodes, 0);
|
|
up_write(&mi->mi_sem);
|
|
}
|