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![Mark Fasheh](/assets/img/avatar_default.png)
ocfs2_direct_IO_get_blocks() was incorrectly returning -EIO for a direct I/O read whose start block was past the end of the file allocation tree. Fix things so that we return a hole instead. do_direct_IO() will then notice that the range start is past eof and return a short read. While there, remove the unused vbo_max variable. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
665 lines
17 KiB
C
665 lines
17 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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#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 "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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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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/* this can happen if another node truncs after our extend! */
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spin_lock(&OCFS2_I(inode)->ip_lock);
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if (iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
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OCFS2_I(inode)->ip_clusters))
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err = -EIO;
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spin_unlock(&OCFS2_I(inode)->ip_lock);
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if (err)
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goto bail;
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err = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno,
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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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map_bh(bh_result, inode->i_sb, p_blkno);
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if (bh_result->b_blocknr == 0) {
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err = -EIO;
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mlog(ML_ERROR, "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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}
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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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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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/* This can also be called from ocfs2_write_zero_page() which has done
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* it's own cluster locking. */
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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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* ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called
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* from loopback. It must be able to perform its own locking around
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* ocfs2_get_block().
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*/
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static int ocfs2_prepare_write(struct file *file, struct page *page,
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unsigned from, unsigned to)
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{
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struct inode *inode = page->mapping->host;
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int ret;
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mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
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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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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_prepare_write_nolock(inode, page, from, to);
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ocfs2_meta_unlock(inode, 0);
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out:
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mlog_exit(ret);
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return ret;
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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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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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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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}
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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 int ocfs2_commit_write(struct file *file, 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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struct buffer_head *di_bh = NULL;
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struct inode *inode = page->mapping->host;
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handle_t *handle = NULL;
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struct ocfs2_dinode *di;
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mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
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/* NOTE: ocfs2_file_aio_write has ensured that it's safe for
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* us to continue here without rechecking the I/O against
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* changed inode values.
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*
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* 1) We're currently holding the inode alloc lock, so no
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* nodes can change it underneath us.
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*
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* 2) We've had to take the metadata lock at least once
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* already to check for extending writes, suid removal, etc.
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* The meta data update code then ensures that we don't get a
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* stale inode allocation image (i_size, i_clusters, etc).
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*/
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ret = ocfs2_meta_lock_with_page(inode, &di_bh, 1, page);
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if (ret != 0) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_data_lock_with_page(inode, 1, page);
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if (ret != 0) {
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mlog_errno(ret);
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goto out_unlock_meta;
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}
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handle = ocfs2_start_walk_page_trans(inode, page, from, to);
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if (IS_ERR(handle)) {
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ret = PTR_ERR(handle);
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goto out_unlock_data;
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}
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/* Mark our buffer early. We'd rather catch this error up here
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* as opposed to after a successful commit_write which would
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* require us to set back inode->i_size. */
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ret = ocfs2_journal_access(handle, inode, di_bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_commit;
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}
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/* might update i_size */
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ret = generic_commit_write(file, page, from, to);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_commit;
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}
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di = (struct ocfs2_dinode *)di_bh->b_data;
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/* ocfs2_mark_inode_dirty() is too heavy to use here. */
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inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
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di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
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inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
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di->i_size = cpu_to_le64((u64)i_size_read(inode));
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ret = ocfs2_journal_dirty(handle, di_bh);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_commit;
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}
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out_commit:
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ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
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out_unlock_data:
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ocfs2_data_unlock(inode, 1);
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out_unlock_meta:
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ocfs2_meta_unlock(inode, 1);
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out:
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if (di_bh)
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brelse(di_bh);
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mlog_exit(ret);
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return ret;
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}
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static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
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{
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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, 1, &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. */
|
|
|
|
spin_lock(&OCFS2_I(inode)->ip_lock);
|
|
inode_blocks = ocfs2_clusters_to_blocks(inode->i_sb,
|
|
OCFS2_I(inode)->ip_clusters);
|
|
|
|
/*
|
|
* For a read which begins past the end of file, we return a hole.
|
|
*/
|
|
if (!create && (iblock >= inode_blocks)) {
|
|
spin_unlock(&OCFS2_I(inode)->ip_lock);
|
|
ret = 0;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Any write past EOF is not allowed because we'd be extending.
|
|
*/
|
|
if (create && (iblock + max_blocks) > inode_blocks) {
|
|
spin_unlock(&OCFS2_I(inode)->ip_lock);
|
|
ret = -EIO;
|
|
goto bail;
|
|
}
|
|
spin_unlock(&OCFS2_I(inode)->ip_lock);
|
|
|
|
/* This figures out the size of the next contiguous block, and
|
|
* our logical offset */
|
|
ret = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno,
|
|
&contig_blocks);
|
|
if (ret) {
|
|
mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
|
|
(unsigned long long)iblock);
|
|
ret = -EIO;
|
|
goto bail;
|
|
}
|
|
|
|
map_bh(bh_result, inode->i_sb, p_blkno);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
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();
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
const struct address_space_operations ocfs2_aops = {
|
|
.readpage = ocfs2_readpage,
|
|
.writepage = ocfs2_writepage,
|
|
.prepare_write = ocfs2_prepare_write,
|
|
.commit_write = ocfs2_commit_write,
|
|
.bmap = ocfs2_bmap,
|
|
.sync_page = block_sync_page,
|
|
.direct_IO = ocfs2_direct_IO
|
|
};
|