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25baf2da14
ocfs2_get_block() didn't understand sparse files, fix that. Also remove some code that isn't really useful anymore. We can fix up ocfs2_direct_IO_get_blocks() at the same time. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
1243 lines
32 KiB
C
1243 lines
32 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <asm/byteorder.h>
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#include <linux/swap.h>
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#define MLOG_MASK_PREFIX ML_FILE_IO
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "aops.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "file.h"
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#include "inode.h"
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#include "journal.h"
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#include "suballoc.h"
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#include "super.h"
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#include "symlink.h"
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#include "buffer_head_io.h"
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static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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{
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int err = -EIO;
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int status;
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struct ocfs2_dinode *fe = NULL;
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struct buffer_head *bh = NULL;
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struct buffer_head *buffer_cache_bh = NULL;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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void *kaddr;
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mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
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(unsigned long long)iblock, bh_result, create);
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BUG_ON(ocfs2_inode_is_fast_symlink(inode));
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if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
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mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
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(unsigned long long)iblock);
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goto bail;
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}
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status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
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OCFS2_I(inode)->ip_blkno,
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&bh, OCFS2_BH_CACHED, inode);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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fe = (struct ocfs2_dinode *) bh->b_data;
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if (!OCFS2_IS_VALID_DINODE(fe)) {
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mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n",
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(unsigned long long)fe->i_blkno, 7, fe->i_signature);
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goto bail;
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}
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if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
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le32_to_cpu(fe->i_clusters))) {
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mlog(ML_ERROR, "block offset is outside the allocated size: "
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"%llu\n", (unsigned long long)iblock);
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goto bail;
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}
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/* We don't use the page cache to create symlink data, so if
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* need be, copy it over from the buffer cache. */
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if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
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u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
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iblock;
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buffer_cache_bh = sb_getblk(osb->sb, blkno);
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if (!buffer_cache_bh) {
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mlog(ML_ERROR, "couldn't getblock for symlink!\n");
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goto bail;
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}
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/* we haven't locked out transactions, so a commit
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* could've happened. Since we've got a reference on
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* the bh, even if it commits while we're doing the
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* copy, the data is still good. */
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if (buffer_jbd(buffer_cache_bh)
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&& ocfs2_inode_is_new(inode)) {
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kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
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if (!kaddr) {
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mlog(ML_ERROR, "couldn't kmap!\n");
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goto bail;
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}
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memcpy(kaddr + (bh_result->b_size * iblock),
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buffer_cache_bh->b_data,
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bh_result->b_size);
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kunmap_atomic(kaddr, KM_USER0);
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set_buffer_uptodate(bh_result);
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}
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brelse(buffer_cache_bh);
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}
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map_bh(bh_result, inode->i_sb,
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le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
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err = 0;
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bail:
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if (bh)
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brelse(bh);
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mlog_exit(err);
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return err;
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}
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static int ocfs2_get_block(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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{
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int err = 0;
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u64 p_blkno, past_eof;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
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(unsigned long long)iblock, bh_result, create);
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if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
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mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
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inode, inode->i_ino);
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if (S_ISLNK(inode->i_mode)) {
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/* this always does I/O for some reason. */
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err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
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goto bail;
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}
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err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL);
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if (err) {
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mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
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"%llu, NULL)\n", err, inode, (unsigned long long)iblock,
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(unsigned long long)p_blkno);
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goto bail;
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}
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/*
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* ocfs2 never allocates in this function - the only time we
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* need to use BH_New is when we're extending i_size on a file
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* system which doesn't support holes, in which case BH_New
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* allows block_prepare_write() to zero.
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*/
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mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb),
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"ino %lu, iblock %llu\n", inode->i_ino,
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(unsigned long long)iblock);
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if (p_blkno)
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map_bh(bh_result, inode->i_sb, p_blkno);
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if (!ocfs2_sparse_alloc(osb)) {
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if (p_blkno == 0) {
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err = -EIO;
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mlog(ML_ERROR,
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"iblock = %llu p_blkno = %llu blkno=(%llu)\n",
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(unsigned long long)iblock,
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(unsigned long long)p_blkno,
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(unsigned long long)OCFS2_I(inode)->ip_blkno);
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mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
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dump_stack();
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}
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past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
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mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino,
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(unsigned long long)past_eof);
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if (create && (iblock >= past_eof))
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set_buffer_new(bh_result);
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}
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bail:
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if (err < 0)
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err = -EIO;
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mlog_exit(err);
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return err;
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}
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static int ocfs2_readpage(struct file *file, struct page *page)
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{
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struct inode *inode = page->mapping->host;
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loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
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int ret, unlock = 1;
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mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
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ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page);
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if (ret != 0) {
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if (ret == AOP_TRUNCATED_PAGE)
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unlock = 0;
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mlog_errno(ret);
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goto out;
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}
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down_read(&OCFS2_I(inode)->ip_alloc_sem);
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/*
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* i_size might have just been updated as we grabed the meta lock. We
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* might now be discovering a truncate that hit on another node.
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* block_read_full_page->get_block freaks out if it is asked to read
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* beyond the end of a file, so we check here. Callers
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* (generic_file_read, fault->nopage) are clever enough to check i_size
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* and notice that the page they just read isn't needed.
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*
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* XXX sys_readahead() seems to get that wrong?
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*/
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if (start >= i_size_read(inode)) {
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char *addr = kmap(page);
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memset(addr, 0, PAGE_SIZE);
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flush_dcache_page(page);
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kunmap(page);
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SetPageUptodate(page);
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ret = 0;
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goto out_alloc;
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}
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ret = ocfs2_data_lock_with_page(inode, 0, page);
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if (ret != 0) {
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if (ret == AOP_TRUNCATED_PAGE)
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unlock = 0;
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mlog_errno(ret);
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goto out_alloc;
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}
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ret = block_read_full_page(page, ocfs2_get_block);
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unlock = 0;
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ocfs2_data_unlock(inode, 0);
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out_alloc:
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up_read(&OCFS2_I(inode)->ip_alloc_sem);
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ocfs2_meta_unlock(inode, 0);
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out:
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if (unlock)
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unlock_page(page);
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mlog_exit(ret);
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return ret;
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}
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/* Note: Because we don't support holes, our allocation has
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* already happened (allocation writes zeros to the file data)
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* so we don't have to worry about ordered writes in
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* ocfs2_writepage.
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*
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* ->writepage is called during the process of invalidating the page cache
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* during blocked lock processing. It can't block on any cluster locks
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* to during block mapping. It's relying on the fact that the block
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* mapping can't have disappeared under the dirty pages that it is
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* being asked to write back.
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*/
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static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
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{
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int ret;
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mlog_entry("(0x%p)\n", page);
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ret = block_write_full_page(page, ocfs2_get_block, wbc);
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mlog_exit(ret);
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return ret;
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}
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/*
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* This is called from ocfs2_write_zero_page() which has handled it's
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* own cluster locking and has ensured allocation exists for those
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* blocks to be written.
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*/
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int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
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unsigned from, unsigned to)
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{
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int ret;
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down_read(&OCFS2_I(inode)->ip_alloc_sem);
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ret = block_prepare_write(page, from, to, ocfs2_get_block);
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up_read(&OCFS2_I(inode)->ip_alloc_sem);
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return ret;
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}
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|
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/* Taken from ext3. We don't necessarily need the full blown
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* functionality yet, but IMHO it's better to cut and paste the whole
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* thing so we can avoid introducing our own bugs (and easily pick up
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* their fixes when they happen) --Mark */
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static int walk_page_buffers( handle_t *handle,
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struct buffer_head *head,
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unsigned from,
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unsigned to,
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int *partial,
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int (*fn)( handle_t *handle,
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struct buffer_head *bh))
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{
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struct buffer_head *bh;
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unsigned block_start, block_end;
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unsigned blocksize = head->b_size;
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int err, ret = 0;
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struct buffer_head *next;
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for ( bh = head, block_start = 0;
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ret == 0 && (bh != head || !block_start);
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block_start = block_end, bh = next)
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{
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next = bh->b_this_page;
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block_end = block_start + blocksize;
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if (block_end <= from || block_start >= to) {
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if (partial && !buffer_uptodate(bh))
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*partial = 1;
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continue;
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}
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err = (*fn)(handle, bh);
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if (!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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handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
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struct page *page,
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unsigned from,
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unsigned to)
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{
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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handle_t *handle = NULL;
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int ret = 0;
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|
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handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
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if (!handle) {
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ret = -ENOMEM;
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mlog_errno(ret);
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goto out;
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}
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|
|
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if (ocfs2_should_order_data(inode)) {
|
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ret = walk_page_buffers(handle,
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page_buffers(page),
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from, to, NULL,
|
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ocfs2_journal_dirty_data);
|
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if (ret < 0)
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mlog_errno(ret);
|
|
}
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out:
|
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if (ret) {
|
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if (handle)
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ocfs2_commit_trans(osb, handle);
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handle = ERR_PTR(ret);
|
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}
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return handle;
|
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}
|
|
|
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static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
sector_t status;
|
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u64 p_blkno = 0;
|
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int err = 0;
|
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struct inode *inode = mapping->host;
|
|
|
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mlog_entry("(block = %llu)\n", (unsigned long long)block);
|
|
|
|
/* We don't need to lock journal system files, since they aren't
|
|
* accessed concurrently from multiple nodes.
|
|
*/
|
|
if (!INODE_JOURNAL(inode)) {
|
|
err = ocfs2_meta_lock(inode, NULL, 0);
|
|
if (err) {
|
|
if (err != -ENOENT)
|
|
mlog_errno(err);
|
|
goto bail;
|
|
}
|
|
down_read(&OCFS2_I(inode)->ip_alloc_sem);
|
|
}
|
|
|
|
err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL);
|
|
|
|
if (!INODE_JOURNAL(inode)) {
|
|
up_read(&OCFS2_I(inode)->ip_alloc_sem);
|
|
ocfs2_meta_unlock(inode, 0);
|
|
}
|
|
|
|
if (err) {
|
|
mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
|
|
(unsigned long long)block);
|
|
mlog_errno(err);
|
|
goto bail;
|
|
}
|
|
|
|
|
|
bail:
|
|
status = err ? 0 : p_blkno;
|
|
|
|
mlog_exit((int)status);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* TODO: Make this into a generic get_blocks function.
|
|
*
|
|
* From do_direct_io in direct-io.c:
|
|
* "So what we do is to permit the ->get_blocks function to populate
|
|
* bh.b_size with the size of IO which is permitted at this offset and
|
|
* this i_blkbits."
|
|
*
|
|
* This function is called directly from get_more_blocks in direct-io.c.
|
|
*
|
|
* called like this: dio->get_blocks(dio->inode, fs_startblk,
|
|
* fs_count, map_bh, dio->rw == WRITE);
|
|
*/
|
|
static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
int ret;
|
|
u64 p_blkno, inode_blocks;
|
|
int contig_blocks;
|
|
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
|
|
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
|
|
|
|
/* This function won't even be called if the request isn't all
|
|
* nicely aligned and of the right size, so there's no need
|
|
* for us to check any of that. */
|
|
|
|
inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
|
|
|
|
/*
|
|
* Any write past EOF is not allowed because we'd be extending.
|
|
*/
|
|
if (create && (iblock + max_blocks) > inode_blocks) {
|
|
ret = -EIO;
|
|
goto bail;
|
|
}
|
|
|
|
/* This figures out the size of the next contiguous block, and
|
|
* our logical offset */
|
|
ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
|
|
&contig_blocks);
|
|
if (ret) {
|
|
mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
|
|
(unsigned long long)iblock);
|
|
ret = -EIO;
|
|
goto bail;
|
|
}
|
|
|
|
if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) {
|
|
ocfs2_error(inode->i_sb,
|
|
"Inode %llu has a hole at block %llu\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno,
|
|
(unsigned long long)iblock);
|
|
ret = -EROFS;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* get_more_blocks() expects us to describe a hole by clearing
|
|
* the mapped bit on bh_result().
|
|
*/
|
|
if (p_blkno)
|
|
map_bh(bh_result, inode->i_sb, p_blkno);
|
|
else {
|
|
/*
|
|
* ocfs2_prepare_inode_for_write() should have caught
|
|
* the case where we'd be filling a hole and triggered
|
|
* a buffered write instead.
|
|
*/
|
|
if (create) {
|
|
ret = -EIO;
|
|
mlog_errno(ret);
|
|
goto bail;
|
|
}
|
|
|
|
clear_buffer_mapped(bh_result);
|
|
}
|
|
|
|
/* make sure we don't map more than max_blocks blocks here as
|
|
that's all the kernel will handle at this point. */
|
|
if (max_blocks < contig_blocks)
|
|
contig_blocks = max_blocks;
|
|
bh_result->b_size = contig_blocks << blocksize_bits;
|
|
bail:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
|
|
* particularly interested in the aio/dio case. Like the core uses
|
|
* i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
|
|
* truncation on another.
|
|
*/
|
|
static void ocfs2_dio_end_io(struct kiocb *iocb,
|
|
loff_t offset,
|
|
ssize_t bytes,
|
|
void *private)
|
|
{
|
|
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
|
|
|
|
/* this io's submitter should not have unlocked this before we could */
|
|
BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
|
|
ocfs2_iocb_clear_rw_locked(iocb);
|
|
up_read(&inode->i_alloc_sem);
|
|
ocfs2_rw_unlock(inode, 0);
|
|
}
|
|
|
|
/*
|
|
* ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
|
|
* from ext3. PageChecked() bits have been removed as OCFS2 does not
|
|
* do journalled data.
|
|
*/
|
|
static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
|
|
{
|
|
journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
|
|
|
|
journal_invalidatepage(journal, page, offset);
|
|
}
|
|
|
|
static int ocfs2_releasepage(struct page *page, gfp_t wait)
|
|
{
|
|
journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
|
|
|
|
if (!page_has_buffers(page))
|
|
return 0;
|
|
return journal_try_to_free_buffers(journal, page, wait);
|
|
}
|
|
|
|
static ssize_t ocfs2_direct_IO(int rw,
|
|
struct kiocb *iocb,
|
|
const struct iovec *iov,
|
|
loff_t offset,
|
|
unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
|
|
int ret;
|
|
|
|
mlog_entry_void();
|
|
|
|
if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
|
|
/*
|
|
* We get PR data locks even for O_DIRECT. This
|
|
* allows concurrent O_DIRECT I/O but doesn't let
|
|
* O_DIRECT with extending and buffered zeroing writes
|
|
* race. If they did race then the buffered zeroing
|
|
* could be written back after the O_DIRECT I/O. It's
|
|
* one thing to tell people not to mix buffered and
|
|
* O_DIRECT writes, but expecting them to understand
|
|
* that file extension is also an implicit buffered
|
|
* write is too much. By getting the PR we force
|
|
* writeback of the buffered zeroing before
|
|
* proceeding.
|
|
*/
|
|
ret = ocfs2_data_lock(inode, 0);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
ocfs2_data_unlock(inode, 0);
|
|
}
|
|
|
|
ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
|
|
inode->i_sb->s_bdev, iov, offset,
|
|
nr_segs,
|
|
ocfs2_direct_IO_get_blocks,
|
|
ocfs2_dio_end_io);
|
|
out:
|
|
mlog_exit(ret);
|
|
return ret;
|
|
}
|
|
|
|
static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
|
|
u32 cpos,
|
|
unsigned int *start,
|
|
unsigned int *end)
|
|
{
|
|
unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
|
|
|
|
if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
|
|
unsigned int cpp;
|
|
|
|
cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
|
|
|
|
cluster_start = cpos % cpp;
|
|
cluster_start = cluster_start << osb->s_clustersize_bits;
|
|
|
|
cluster_end = cluster_start + osb->s_clustersize;
|
|
}
|
|
|
|
BUG_ON(cluster_start > PAGE_SIZE);
|
|
BUG_ON(cluster_end > PAGE_SIZE);
|
|
|
|
if (start)
|
|
*start = cluster_start;
|
|
if (end)
|
|
*end = cluster_end;
|
|
}
|
|
|
|
/*
|
|
* 'from' and 'to' are the region in the page to avoid zeroing.
|
|
*
|
|
* If pagesize > clustersize, this function will avoid zeroing outside
|
|
* of the cluster boundary.
|
|
*
|
|
* from == to == 0 is code for "zero the entire cluster region"
|
|
*/
|
|
static void ocfs2_clear_page_regions(struct page *page,
|
|
struct ocfs2_super *osb, u32 cpos,
|
|
unsigned from, unsigned to)
|
|
{
|
|
void *kaddr;
|
|
unsigned int cluster_start, cluster_end;
|
|
|
|
ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
|
|
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
|
|
if (from || to) {
|
|
if (from > cluster_start)
|
|
memset(kaddr + cluster_start, 0, from - cluster_start);
|
|
if (to < cluster_end)
|
|
memset(kaddr + to, 0, cluster_end - to);
|
|
} else {
|
|
memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
|
|
}
|
|
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
|
|
/*
|
|
* Some of this taken from block_prepare_write(). We already have our
|
|
* mapping by now though, and the entire write will be allocating or
|
|
* it won't, so not much need to use BH_New.
|
|
*
|
|
* This will also skip zeroing, which is handled externally.
|
|
*/
|
|
static int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
|
|
struct inode *inode, unsigned int from,
|
|
unsigned int to, int new)
|
|
{
|
|
int ret = 0;
|
|
struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
|
|
unsigned int block_end, block_start;
|
|
unsigned int bsize = 1 << inode->i_blkbits;
|
|
|
|
if (!page_has_buffers(page))
|
|
create_empty_buffers(page, bsize, 0);
|
|
|
|
head = page_buffers(page);
|
|
for (bh = head, block_start = 0; bh != head || !block_start;
|
|
bh = bh->b_this_page, block_start += bsize) {
|
|
block_end = block_start + bsize;
|
|
|
|
/*
|
|
* Ignore blocks outside of our i/o range -
|
|
* they may belong to unallocated clusters.
|
|
*/
|
|
if (block_start >= to ||
|
|
(block_start + bsize) <= from) {
|
|
if (PageUptodate(page))
|
|
set_buffer_uptodate(bh);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* For an allocating write with cluster size >= page
|
|
* size, we always write the entire page.
|
|
*/
|
|
|
|
if (buffer_new(bh))
|
|
clear_buffer_new(bh);
|
|
|
|
if (!buffer_mapped(bh)) {
|
|
map_bh(bh, inode->i_sb, *p_blkno);
|
|
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
|
|
}
|
|
|
|
if (PageUptodate(page)) {
|
|
if (!buffer_uptodate(bh))
|
|
set_buffer_uptodate(bh);
|
|
} else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
|
|
(block_start < from || block_end > to)) {
|
|
ll_rw_block(READ, 1, &bh);
|
|
*wait_bh++=bh;
|
|
}
|
|
|
|
*p_blkno = *p_blkno + 1;
|
|
}
|
|
|
|
/*
|
|
* If we issued read requests - let them complete.
|
|
*/
|
|
while(wait_bh > wait) {
|
|
wait_on_buffer(*--wait_bh);
|
|
if (!buffer_uptodate(*wait_bh))
|
|
ret = -EIO;
|
|
}
|
|
|
|
if (ret == 0 || !new)
|
|
return ret;
|
|
|
|
/*
|
|
* If we get -EIO above, zero out any newly allocated blocks
|
|
* to avoid exposing stale data.
|
|
*/
|
|
bh = head;
|
|
block_start = 0;
|
|
do {
|
|
void *kaddr;
|
|
|
|
block_end = block_start + bsize;
|
|
if (block_end <= from)
|
|
goto next_bh;
|
|
if (block_start >= to)
|
|
break;
|
|
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
memset(kaddr+block_start, 0, bh->b_size);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
|
|
next_bh:
|
|
block_start = block_end;
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This will copy user data from the iovec in the buffered write
|
|
* context.
|
|
*/
|
|
int ocfs2_map_and_write_user_data(struct inode *inode,
|
|
struct ocfs2_write_ctxt *wc, u64 *p_blkno,
|
|
unsigned int *ret_from, unsigned int *ret_to)
|
|
{
|
|
int ret;
|
|
unsigned int to, from, cluster_start, cluster_end;
|
|
unsigned long bytes, src_from;
|
|
char *dst;
|
|
struct ocfs2_buffered_write_priv *bp = wc->w_private;
|
|
const struct iovec *cur_iov = bp->b_cur_iov;
|
|
char __user *buf;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start,
|
|
&cluster_end);
|
|
|
|
buf = cur_iov->iov_base + bp->b_cur_off;
|
|
src_from = (unsigned long)buf & ~PAGE_CACHE_MASK;
|
|
|
|
from = wc->w_pos & (PAGE_CACHE_SIZE - 1);
|
|
|
|
/*
|
|
* This is a lot of comparisons, but it reads quite
|
|
* easily, which is important here.
|
|
*/
|
|
/* Stay within the src page */
|
|
bytes = PAGE_SIZE - src_from;
|
|
/* Stay within the vector */
|
|
bytes = min(bytes,
|
|
(unsigned long)(cur_iov->iov_len - bp->b_cur_off));
|
|
/* Stay within count */
|
|
bytes = min(bytes, (unsigned long)wc->w_count);
|
|
/*
|
|
* For clustersize > page size, just stay within
|
|
* target page, otherwise we have to calculate pos
|
|
* within the cluster and obey the rightmost
|
|
* boundary.
|
|
*/
|
|
if (wc->w_large_pages) {
|
|
/*
|
|
* For cluster size < page size, we have to
|
|
* calculate pos within the cluster and obey
|
|
* the rightmost boundary.
|
|
*/
|
|
bytes = min(bytes, (unsigned long)(osb->s_clustersize
|
|
- (wc->w_pos & (osb->s_clustersize - 1))));
|
|
} else {
|
|
/*
|
|
* cluster size > page size is the most common
|
|
* case - we just stay within the target page
|
|
* boundary.
|
|
*/
|
|
bytes = min(bytes, PAGE_CACHE_SIZE - from);
|
|
}
|
|
|
|
to = from + bytes;
|
|
|
|
if (wc->w_this_page_new)
|
|
ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
|
|
cluster_start, cluster_end, 1);
|
|
else
|
|
ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
|
|
from, to, 0);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(from > PAGE_CACHE_SIZE);
|
|
BUG_ON(to > PAGE_CACHE_SIZE);
|
|
BUG_ON(from > osb->s_clustersize);
|
|
BUG_ON(to > osb->s_clustersize);
|
|
|
|
dst = kmap(wc->w_this_page);
|
|
memcpy(dst + from, bp->b_src_buf + src_from, bytes);
|
|
kunmap(wc->w_this_page);
|
|
|
|
/*
|
|
* XXX: This is slow, but simple. The caller of
|
|
* ocfs2_buffered_write_cluster() is responsible for
|
|
* passing through the iovecs, so it's difficult to
|
|
* predict what our next step is in here after our
|
|
* initial write. A future version should be pushing
|
|
* that iovec manipulation further down.
|
|
*
|
|
* By setting this, we indicate that a copy from user
|
|
* data was done, and subsequent calls for this
|
|
* cluster will skip copying more data.
|
|
*/
|
|
wc->w_finished_copy = 1;
|
|
|
|
*ret_from = from;
|
|
*ret_to = to;
|
|
out:
|
|
|
|
return bytes ? (unsigned int)bytes : ret;
|
|
}
|
|
|
|
/*
|
|
* Map, fill and write a page to disk.
|
|
*
|
|
* The work of copying data is done via callback. Newly allocated
|
|
* pages which don't take user data will be zero'd (set 'new' to
|
|
* indicate an allocating write)
|
|
*
|
|
* Returns a negative error code or the number of bytes copied into
|
|
* the page.
|
|
*/
|
|
int ocfs2_write_data_page(struct inode *inode, handle_t *handle,
|
|
u64 *p_blkno, struct page *page,
|
|
struct ocfs2_write_ctxt *wc, int new)
|
|
{
|
|
int ret, copied = 0;
|
|
unsigned int from = 0, to = 0;
|
|
unsigned int cluster_start, cluster_end;
|
|
unsigned int zero_from = 0, zero_to = 0;
|
|
|
|
ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), wc->w_cpos,
|
|
&cluster_start, &cluster_end);
|
|
|
|
if ((wc->w_pos >> PAGE_CACHE_SHIFT) == page->index
|
|
&& !wc->w_finished_copy) {
|
|
|
|
wc->w_this_page = page;
|
|
wc->w_this_page_new = new;
|
|
ret = wc->w_write_data_page(inode, wc, p_blkno, &from, &to);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
copied = ret;
|
|
|
|
zero_from = from;
|
|
zero_to = to;
|
|
if (new) {
|
|
from = cluster_start;
|
|
to = cluster_end;
|
|
}
|
|
} else {
|
|
/*
|
|
* If we haven't allocated the new page yet, we
|
|
* shouldn't be writing it out without copying user
|
|
* data. This is likely a math error from the caller.
|
|
*/
|
|
BUG_ON(!new);
|
|
|
|
from = cluster_start;
|
|
to = cluster_end;
|
|
|
|
ret = ocfs2_map_page_blocks(page, p_blkno, inode,
|
|
cluster_start, cluster_end, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Parts of newly allocated pages need to be zero'd.
|
|
*
|
|
* Above, we have also rewritten 'to' and 'from' - as far as
|
|
* the rest of the function is concerned, the entire cluster
|
|
* range inside of a page needs to be written.
|
|
*
|
|
* We can skip this if the page is up to date - it's already
|
|
* been zero'd from being read in as a hole.
|
|
*/
|
|
if (new && !PageUptodate(page))
|
|
ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
|
|
wc->w_cpos, zero_from, zero_to);
|
|
|
|
flush_dcache_page(page);
|
|
|
|
if (ocfs2_should_order_data(inode)) {
|
|
ret = walk_page_buffers(handle,
|
|
page_buffers(page),
|
|
from, to, NULL,
|
|
ocfs2_journal_dirty_data);
|
|
if (ret < 0)
|
|
mlog_errno(ret);
|
|
}
|
|
|
|
/*
|
|
* We don't use generic_commit_write() because we need to
|
|
* handle our own i_size update.
|
|
*/
|
|
ret = block_commit_write(page, from, to);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
out:
|
|
|
|
return copied ? copied : ret;
|
|
}
|
|
|
|
/*
|
|
* Do the actual write of some data into an inode. Optionally allocate
|
|
* in order to fulfill the write.
|
|
*
|
|
* cpos is the logical cluster offset within the file to write at
|
|
*
|
|
* 'phys' is the physical mapping of that offset. a 'phys' value of
|
|
* zero indicates that allocation is required. In this case, data_ac
|
|
* and meta_ac should be valid (meta_ac can be null if metadata
|
|
* allocation isn't required).
|
|
*/
|
|
static ssize_t ocfs2_write(struct file *file, u32 phys, handle_t *handle,
|
|
struct buffer_head *di_bh,
|
|
struct ocfs2_alloc_context *data_ac,
|
|
struct ocfs2_alloc_context *meta_ac,
|
|
struct ocfs2_write_ctxt *wc)
|
|
{
|
|
int ret, i, numpages = 1, new;
|
|
unsigned int copied = 0;
|
|
u32 tmp_pos;
|
|
u64 v_blkno, p_blkno;
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
unsigned int cbits = OCFS2_SB(inode->i_sb)->s_clustersize_bits;
|
|
unsigned long index, start;
|
|
struct page **cpages;
|
|
|
|
new = phys == 0 ? 1 : 0;
|
|
|
|
/*
|
|
* Figure out how many pages we'll be manipulating here. For
|
|
* non-allocating write, or any writes where cluster size is
|
|
* less than page size, we only need one page. Otherwise,
|
|
* allocating writes of cluster size larger than page size
|
|
* need cluster size pages.
|
|
*/
|
|
if (new && !wc->w_large_pages)
|
|
numpages = (1 << cbits) / PAGE_SIZE;
|
|
|
|
cpages = kzalloc(sizeof(*cpages) * numpages, GFP_NOFS);
|
|
if (!cpages) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Fill our page array first. That way we've grabbed enough so
|
|
* that we can zero and flush if we error after adding the
|
|
* extent.
|
|
*/
|
|
if (new) {
|
|
start = ocfs2_align_clusters_to_page_index(inode->i_sb,
|
|
wc->w_cpos);
|
|
v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, wc->w_cpos);
|
|
} else {
|
|
start = wc->w_pos >> PAGE_CACHE_SHIFT;
|
|
v_blkno = wc->w_pos >> inode->i_sb->s_blocksize_bits;
|
|
}
|
|
|
|
for(i = 0; i < numpages; i++) {
|
|
index = start + i;
|
|
|
|
cpages[i] = grab_cache_page(mapping, index);
|
|
if (!cpages[i]) {
|
|
ret = -ENOMEM;
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (new) {
|
|
/*
|
|
* This is safe to call with the page locks - it won't take
|
|
* any additional semaphores or cluster locks.
|
|
*/
|
|
tmp_pos = wc->w_cpos;
|
|
ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode,
|
|
&tmp_pos, 1, di_bh, handle,
|
|
data_ac, meta_ac, NULL);
|
|
/*
|
|
* This shouldn't happen because we must have already
|
|
* calculated the correct meta data allocation required. The
|
|
* internal tree allocation code should know how to increase
|
|
* transaction credits itself.
|
|
*
|
|
* If need be, we could handle -EAGAIN for a
|
|
* RESTART_TRANS here.
|
|
*/
|
|
mlog_bug_on_msg(ret == -EAGAIN,
|
|
"Inode %llu: EAGAIN return during allocation.\n",
|
|
(unsigned long long)OCFS2_I(inode)->ip_blkno);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL);
|
|
if (ret < 0) {
|
|
|
|
/*
|
|
* XXX: Should we go readonly here?
|
|
*/
|
|
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(p_blkno == 0);
|
|
|
|
for(i = 0; i < numpages; i++) {
|
|
ret = ocfs2_write_data_page(inode, handle, &p_blkno, cpages[i],
|
|
wc, new);
|
|
if (ret < 0) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
copied += ret;
|
|
}
|
|
|
|
out:
|
|
for(i = 0; i < numpages; i++) {
|
|
unlock_page(cpages[i]);
|
|
mark_page_accessed(cpages[i]);
|
|
page_cache_release(cpages[i]);
|
|
}
|
|
kfree(cpages);
|
|
|
|
return copied ? copied : ret;
|
|
}
|
|
|
|
static void ocfs2_write_ctxt_init(struct ocfs2_write_ctxt *wc,
|
|
struct ocfs2_super *osb, loff_t pos,
|
|
size_t count, ocfs2_page_writer *cb,
|
|
void *cb_priv)
|
|
{
|
|
wc->w_count = count;
|
|
wc->w_pos = pos;
|
|
wc->w_cpos = wc->w_pos >> osb->s_clustersize_bits;
|
|
wc->w_finished_copy = 0;
|
|
|
|
if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
|
|
wc->w_large_pages = 1;
|
|
else
|
|
wc->w_large_pages = 0;
|
|
|
|
wc->w_write_data_page = cb;
|
|
wc->w_private = cb_priv;
|
|
}
|
|
|
|
/*
|
|
* Write a cluster to an inode. The cluster may not be allocated yet,
|
|
* in which case it will be. This only exists for buffered writes -
|
|
* O_DIRECT takes a more "traditional" path through the kernel.
|
|
*
|
|
* The caller is responsible for incrementing pos, written counts, etc
|
|
*
|
|
* For file systems that don't support sparse files, pre-allocation
|
|
* and page zeroing up until cpos should be done prior to this
|
|
* function call.
|
|
*
|
|
* Callers should be holding i_sem, and the rw cluster lock.
|
|
*
|
|
* Returns the number of user bytes written, or less than zero for
|
|
* error.
|
|
*/
|
|
ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
|
|
size_t count, ocfs2_page_writer *actor,
|
|
void *priv)
|
|
{
|
|
int ret, credits = OCFS2_INODE_UPDATE_CREDITS;
|
|
ssize_t written = 0;
|
|
u32 phys;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
struct buffer_head *di_bh = NULL;
|
|
struct ocfs2_dinode *di;
|
|
struct ocfs2_alloc_context *data_ac = NULL;
|
|
struct ocfs2_alloc_context *meta_ac = NULL;
|
|
handle_t *handle;
|
|
struct ocfs2_write_ctxt wc;
|
|
|
|
ocfs2_write_ctxt_init(&wc, osb, pos, count, actor, priv);
|
|
|
|
ret = ocfs2_meta_lock(inode, &di_bh, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
di = (struct ocfs2_dinode *)di_bh->b_data;
|
|
|
|
/*
|
|
* Take alloc sem here to prevent concurrent lookups. That way
|
|
* the mapping, zeroing and tree manipulation within
|
|
* ocfs2_write() will be safe against ->readpage(). This
|
|
* should also serve to lock out allocation from a shared
|
|
* writeable region.
|
|
*/
|
|
down_write(&OCFS2_I(inode)->ip_alloc_sem);
|
|
|
|
ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_meta;
|
|
}
|
|
|
|
/* phys == 0 means that allocation is required. */
|
|
if (phys == 0) {
|
|
ret = ocfs2_lock_allocators(inode, di, 1, &data_ac, &meta_ac);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_meta;
|
|
}
|
|
|
|
credits = ocfs2_calc_extend_credits(inode->i_sb, di, 1);
|
|
}
|
|
|
|
ret = ocfs2_data_lock(inode, 1);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_meta;
|
|
}
|
|
|
|
handle = ocfs2_start_trans(osb, credits);
|
|
if (IS_ERR(handle)) {
|
|
ret = PTR_ERR(handle);
|
|
mlog_errno(ret);
|
|
goto out_data;
|
|
}
|
|
|
|
written = ocfs2_write(file, phys, handle, di_bh, data_ac,
|
|
meta_ac, &wc);
|
|
if (written < 0) {
|
|
ret = written;
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
ret = ocfs2_journal_access(handle, inode, di_bh,
|
|
OCFS2_JOURNAL_ACCESS_WRITE);
|
|
if (ret) {
|
|
mlog_errno(ret);
|
|
goto out_commit;
|
|
}
|
|
|
|
pos += written;
|
|
if (pos > inode->i_size) {
|
|
i_size_write(inode, pos);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
|
|
di->i_size = cpu_to_le64((u64)i_size_read(inode));
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
|
|
di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
|
|
|
|
ret = ocfs2_journal_dirty(handle, di_bh);
|
|
if (ret)
|
|
mlog_errno(ret);
|
|
|
|
out_commit:
|
|
ocfs2_commit_trans(osb, handle);
|
|
|
|
out_data:
|
|
ocfs2_data_unlock(inode, 1);
|
|
|
|
out_meta:
|
|
up_write(&OCFS2_I(inode)->ip_alloc_sem);
|
|
ocfs2_meta_unlock(inode, 1);
|
|
|
|
out:
|
|
brelse(di_bh);
|
|
if (data_ac)
|
|
ocfs2_free_alloc_context(data_ac);
|
|
if (meta_ac)
|
|
ocfs2_free_alloc_context(meta_ac);
|
|
|
|
return written ? written : ret;
|
|
}
|
|
|
|
const struct address_space_operations ocfs2_aops = {
|
|
.readpage = ocfs2_readpage,
|
|
.writepage = ocfs2_writepage,
|
|
.bmap = ocfs2_bmap,
|
|
.sync_page = block_sync_page,
|
|
.direct_IO = ocfs2_direct_IO,
|
|
.invalidatepage = ocfs2_invalidatepage,
|
|
.releasepage = ocfs2_releasepage,
|
|
.migratepage = buffer_migrate_page,
|
|
};
|