fd4c5748b8
When gfs2 attempts to write a page to a file that is being truncated, and notices that the page is completely outside of the file size, it tries to invalidate it. However, this may require a transaction for journaled data files to revoke any buffers from the page on the active items list. Unfortunately, this can happen inside a log flush, where a transaction cannot be started. Also, gfs2 may need to be able to remove the buffer from the ail1 list before it can finish the log flush. To deal with this, when writing a page of a file with data journalling enabled gfs2 now skips the check to see if the write is outside the file size, and simply writes it anyway. This situation can only occur when the truncate code still has the file locked exclusively, and hasn't marked this block as free in the metadata (which happens later in truc_dealloc). After gfs2 writes this page out, the truncation code will shortly invalidate it and write out any revokes if necessary. To do this, gfs2 now implements its own version of block_write_full_page without the check, and calls the newly exported __block_write_full_page. It also no longer calls gfs2_writepage_common from gfs2_jdata_writepage. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
1254 lines
32 KiB
C
1254 lines
32 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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#include <linux/mpage.h>
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#include <linux/fs.h>
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#include <linux/writeback.h>
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#include <linux/swap.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/backing-dev.h>
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#include <linux/uio.h>
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#include <trace/events/writeback.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "bmap.h"
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#include "glock.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "quota.h"
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#include "trans.h"
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#include "rgrp.h"
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#include "super.h"
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#include "util.h"
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#include "glops.h"
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static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int to)
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{
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struct buffer_head *head = page_buffers(page);
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unsigned int bsize = head->b_size;
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struct buffer_head *bh;
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unsigned int start, end;
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for (bh = head, start = 0; bh != head || !start;
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bh = bh->b_this_page, start = end) {
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end = start + bsize;
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if (end <= from || start >= to)
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continue;
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if (gfs2_is_jdata(ip))
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set_buffer_uptodate(bh);
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gfs2_trans_add_data(ip->i_gl, bh);
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}
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}
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/**
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* gfs2_get_block_noalloc - Fills in a buffer head with details about a block
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* @inode: The inode
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* @lblock: The block number to look up
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* @bh_result: The buffer head to return the result in
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* @create: Non-zero if we may add block to the file
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*
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* Returns: errno
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*/
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static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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int error;
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error = gfs2_block_map(inode, lblock, bh_result, 0);
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if (error)
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return error;
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if (!buffer_mapped(bh_result))
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return -EIO;
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return 0;
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}
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static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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return gfs2_block_map(inode, lblock, bh_result, 0);
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}
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/**
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* gfs2_writepage_common - Common bits of writepage
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* @page: The page to be written
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* @wbc: The writeback control
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*
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* Returns: 1 if writepage is ok, otherwise an error code or zero if no error.
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*/
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static int gfs2_writepage_common(struct page *page,
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struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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loff_t i_size = i_size_read(inode);
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pgoff_t end_index = i_size >> PAGE_SHIFT;
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unsigned offset;
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if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
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goto out;
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if (current->journal_info)
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goto redirty;
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/* Is the page fully outside i_size? (truncate in progress) */
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offset = i_size & (PAGE_SIZE-1);
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if (page->index > end_index || (page->index == end_index && !offset)) {
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page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
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goto out;
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}
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return 1;
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redirty:
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redirty_page_for_writepage(wbc, page);
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out:
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unlock_page(page);
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return 0;
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}
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/**
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* gfs2_writepage - Write page for writeback mappings
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* @page: The page
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* @wbc: The writeback control
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*
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*/
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static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
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{
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int ret;
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ret = gfs2_writepage_common(page, wbc);
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if (ret <= 0)
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return ret;
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return nobh_writepage(page, gfs2_get_block_noalloc, wbc);
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}
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/* This is the same as calling block_write_full_page, but it also
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* writes pages outside of i_size
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*/
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int gfs2_write_full_page(struct page *page, get_block_t *get_block,
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struct writeback_control *wbc)
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{
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struct inode * const inode = page->mapping->host;
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loff_t i_size = i_size_read(inode);
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const pgoff_t end_index = i_size >> PAGE_SHIFT;
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unsigned offset;
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/*
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* The page straddles i_size. It must be zeroed out on each and every
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* writepage invocation because it may be mmapped. "A file is mapped
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* in multiples of the page size. For a file that is not a multiple of
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* the page size, the remaining memory is zeroed when mapped, and
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* writes to that region are not written out to the file."
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*/
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offset = i_size & (PAGE_SIZE-1);
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if (page->index == end_index && offset)
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zero_user_segment(page, offset, PAGE_SIZE);
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return __block_write_full_page(inode, page, get_block, wbc,
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end_buffer_async_write);
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}
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/**
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* __gfs2_jdata_writepage - The core of jdata writepage
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* @page: The page to write
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* @wbc: The writeback control
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*
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* This is shared between writepage and writepages and implements the
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* core of the writepage operation. If a transaction is required then
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* PageChecked will have been set and the transaction will have
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* already been started before this is called.
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*/
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static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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if (PageChecked(page)) {
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ClearPageChecked(page);
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if (!page_has_buffers(page)) {
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create_empty_buffers(page, inode->i_sb->s_blocksize,
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(1 << BH_Dirty)|(1 << BH_Uptodate));
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}
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gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
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}
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return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc);
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}
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/**
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* gfs2_jdata_writepage - Write complete page
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* @page: Page to write
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* @wbc: The writeback control
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*
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* Returns: errno
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*
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*/
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static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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int ret;
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if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
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goto out;
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if (PageChecked(page) || current->journal_info)
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goto out_ignore;
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ret = __gfs2_jdata_writepage(page, wbc);
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return ret;
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out_ignore:
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redirty_page_for_writepage(wbc, page);
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out:
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unlock_page(page);
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return 0;
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}
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/**
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* gfs2_writepages - Write a bunch of dirty pages back to disk
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* @mapping: The mapping to write
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* @wbc: Write-back control
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*
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* Used for both ordered and writeback modes.
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*/
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static int gfs2_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
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}
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/**
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* gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
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* @mapping: The mapping
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* @wbc: The writeback control
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* @pvec: The vector of pages
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* @nr_pages: The number of pages to write
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* @end: End position
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* @done_index: Page index
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*
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* Returns: non-zero if loop should terminate, zero otherwise
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*/
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static int gfs2_write_jdata_pagevec(struct address_space *mapping,
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struct writeback_control *wbc,
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struct pagevec *pvec,
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int nr_pages, pgoff_t end,
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pgoff_t *done_index)
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{
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struct inode *inode = mapping->host;
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize);
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int i;
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int ret;
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ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
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if (ret < 0)
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return ret;
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for(i = 0; i < nr_pages; i++) {
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struct page *page = pvec->pages[i];
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/*
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* At this point, the page may be truncated or
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* invalidated (changing page->mapping to NULL), or
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* even swizzled back from swapper_space to tmpfs file
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* mapping. However, page->index will not change
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* because we have a reference on the page.
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*/
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if (page->index > end) {
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/*
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* can't be range_cyclic (1st pass) because
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* end == -1 in that case.
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*/
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ret = 1;
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break;
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}
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*done_index = page->index;
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lock_page(page);
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if (unlikely(page->mapping != mapping)) {
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continue_unlock:
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unlock_page(page);
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continue;
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}
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if (!PageDirty(page)) {
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/* someone wrote it for us */
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goto continue_unlock;
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}
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if (PageWriteback(page)) {
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if (wbc->sync_mode != WB_SYNC_NONE)
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wait_on_page_writeback(page);
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else
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goto continue_unlock;
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}
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BUG_ON(PageWriteback(page));
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if (!clear_page_dirty_for_io(page))
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goto continue_unlock;
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trace_wbc_writepage(wbc, inode_to_bdi(inode));
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ret = __gfs2_jdata_writepage(page, wbc);
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if (unlikely(ret)) {
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if (ret == AOP_WRITEPAGE_ACTIVATE) {
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unlock_page(page);
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ret = 0;
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} else {
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/*
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* done_index is set past this page,
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* so media errors will not choke
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* background writeout for the entire
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* file. This has consequences for
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* range_cyclic semantics (ie. it may
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* not be suitable for data integrity
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* writeout).
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*/
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*done_index = page->index + 1;
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ret = 1;
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break;
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}
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}
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/*
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* We stop writing back only if we are not doing
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* integrity sync. In case of integrity sync we have to
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* keep going until we have written all the pages
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* we tagged for writeback prior to entering this loop.
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*/
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if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
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ret = 1;
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break;
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}
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}
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gfs2_trans_end(sdp);
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return ret;
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}
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/**
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* gfs2_write_cache_jdata - Like write_cache_pages but different
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* @mapping: The mapping to write
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* @wbc: The writeback control
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*
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* The reason that we use our own function here is that we need to
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* start transactions before we grab page locks. This allows us
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* to get the ordering right.
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*/
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static int gfs2_write_cache_jdata(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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int ret = 0;
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int done = 0;
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struct pagevec pvec;
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int nr_pages;
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pgoff_t uninitialized_var(writeback_index);
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pgoff_t index;
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pgoff_t end;
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pgoff_t done_index;
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int cycled;
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int range_whole = 0;
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int tag;
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pagevec_init(&pvec, 0);
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if (wbc->range_cyclic) {
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writeback_index = mapping->writeback_index; /* prev offset */
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index = writeback_index;
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if (index == 0)
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cycled = 1;
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else
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cycled = 0;
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end = -1;
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} else {
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index = wbc->range_start >> PAGE_SHIFT;
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end = wbc->range_end >> PAGE_SHIFT;
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if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
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range_whole = 1;
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cycled = 1; /* ignore range_cyclic tests */
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}
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if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
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tag = PAGECACHE_TAG_TOWRITE;
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else
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tag = PAGECACHE_TAG_DIRTY;
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retry:
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if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
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tag_pages_for_writeback(mapping, index, end);
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done_index = index;
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while (!done && (index <= end)) {
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nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
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min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
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if (nr_pages == 0)
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break;
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ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end, &done_index);
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if (ret)
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done = 1;
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if (ret > 0)
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ret = 0;
|
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pagevec_release(&pvec);
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cond_resched();
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}
|
|
|
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if (!cycled && !done) {
|
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/*
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* range_cyclic:
|
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* We hit the last page and there is more work to be done: wrap
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* back to the start of the file
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*/
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cycled = 1;
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index = 0;
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end = writeback_index - 1;
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goto retry;
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}
|
|
|
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if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
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mapping->writeback_index = done_index;
|
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|
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return ret;
|
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}
|
|
|
|
|
|
/**
|
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* gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
|
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* @mapping: The mapping to write
|
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* @wbc: The writeback control
|
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*
|
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*/
|
|
|
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static int gfs2_jdata_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
|
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{
|
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struct gfs2_inode *ip = GFS2_I(mapping->host);
|
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struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
|
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int ret;
|
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|
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ret = gfs2_write_cache_jdata(mapping, wbc);
|
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if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
|
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gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
|
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ret = gfs2_write_cache_jdata(mapping, wbc);
|
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}
|
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return ret;
|
|
}
|
|
|
|
/**
|
|
* stuffed_readpage - Fill in a Linux page with stuffed file data
|
|
* @ip: the inode
|
|
* @page: the page
|
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*
|
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* Returns: errno
|
|
*/
|
|
|
|
static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
|
|
{
|
|
struct buffer_head *dibh;
|
|
u64 dsize = i_size_read(&ip->i_inode);
|
|
void *kaddr;
|
|
int error;
|
|
|
|
/*
|
|
* Due to the order of unstuffing files and ->fault(), we can be
|
|
* asked for a zero page in the case of a stuffed file being extended,
|
|
* so we need to supply one here. It doesn't happen often.
|
|
*/
|
|
if (unlikely(page->index)) {
|
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zero_user(page, 0, PAGE_SIZE);
|
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SetPageUptodate(page);
|
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return 0;
|
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}
|
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|
|
error = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (error)
|
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return error;
|
|
|
|
kaddr = kmap_atomic(page);
|
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if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
|
|
dsize = (dibh->b_size - sizeof(struct gfs2_dinode));
|
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memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
|
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memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
|
|
kunmap_atomic(kaddr);
|
|
flush_dcache_page(page);
|
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brelse(dibh);
|
|
SetPageUptodate(page);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* __gfs2_readpage - readpage
|
|
* @file: The file to read a page for
|
|
* @page: The page to read
|
|
*
|
|
* This is the core of gfs2's readpage. Its used by the internal file
|
|
* reading code as in that case we already hold the glock. Also its
|
|
* called by gfs2_readpage() once the required lock has been granted.
|
|
*
|
|
*/
|
|
|
|
static int __gfs2_readpage(void *file, struct page *page)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(page->mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
|
|
int error;
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = stuffed_readpage(ip, page);
|
|
unlock_page(page);
|
|
} else {
|
|
error = mpage_readpage(page, gfs2_block_map);
|
|
}
|
|
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
|
|
return -EIO;
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_readpage - read a page of a file
|
|
* @file: The file to read
|
|
* @page: The page of the file
|
|
*
|
|
* This deals with the locking required. We have to unlock and
|
|
* relock the page in order to get the locking in the right
|
|
* order.
|
|
*/
|
|
|
|
static int gfs2_readpage(struct file *file, struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct gfs2_inode *ip = GFS2_I(mapping->host);
|
|
struct gfs2_holder gh;
|
|
int error;
|
|
|
|
unlock_page(page);
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
|
|
error = gfs2_glock_nq(&gh);
|
|
if (unlikely(error))
|
|
goto out;
|
|
error = AOP_TRUNCATED_PAGE;
|
|
lock_page(page);
|
|
if (page->mapping == mapping && !PageUptodate(page))
|
|
error = __gfs2_readpage(file, page);
|
|
else
|
|
unlock_page(page);
|
|
gfs2_glock_dq(&gh);
|
|
out:
|
|
gfs2_holder_uninit(&gh);
|
|
if (error && error != AOP_TRUNCATED_PAGE)
|
|
lock_page(page);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_internal_read - read an internal file
|
|
* @ip: The gfs2 inode
|
|
* @buf: The buffer to fill
|
|
* @pos: The file position
|
|
* @size: The amount to read
|
|
*
|
|
*/
|
|
|
|
int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
|
|
unsigned size)
|
|
{
|
|
struct address_space *mapping = ip->i_inode.i_mapping;
|
|
unsigned long index = *pos / PAGE_SIZE;
|
|
unsigned offset = *pos & (PAGE_SIZE - 1);
|
|
unsigned copied = 0;
|
|
unsigned amt;
|
|
struct page *page;
|
|
void *p;
|
|
|
|
do {
|
|
amt = size - copied;
|
|
if (offset + size > PAGE_SIZE)
|
|
amt = PAGE_SIZE - offset;
|
|
page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
p = kmap_atomic(page);
|
|
memcpy(buf + copied, p + offset, amt);
|
|
kunmap_atomic(p);
|
|
put_page(page);
|
|
copied += amt;
|
|
index++;
|
|
offset = 0;
|
|
} while(copied < size);
|
|
(*pos) += size;
|
|
return size;
|
|
}
|
|
|
|
/**
|
|
* gfs2_readpages - Read a bunch of pages at once
|
|
* @file: The file to read from
|
|
* @mapping: Address space info
|
|
* @pages: List of pages to read
|
|
* @nr_pages: Number of pages to read
|
|
*
|
|
* Some notes:
|
|
* 1. This is only for readahead, so we can simply ignore any things
|
|
* which are slightly inconvenient (such as locking conflicts between
|
|
* the page lock and the glock) and return having done no I/O. Its
|
|
* obviously not something we'd want to do on too regular a basis.
|
|
* Any I/O we ignore at this time will be done via readpage later.
|
|
* 2. We don't handle stuffed files here we let readpage do the honours.
|
|
* 3. mpage_readpages() does most of the heavy lifting in the common case.
|
|
* 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
|
|
*/
|
|
|
|
static int gfs2_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_holder gh;
|
|
int ret;
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
|
|
ret = gfs2_glock_nq(&gh);
|
|
if (unlikely(ret))
|
|
goto out_uninit;
|
|
if (!gfs2_is_stuffed(ip))
|
|
ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
|
|
gfs2_glock_dq(&gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&gh);
|
|
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
|
|
ret = -EIO;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_write_begin - Begin to write to a file
|
|
* @file: The file to write to
|
|
* @mapping: The mapping in which to write
|
|
* @pos: The file offset at which to start writing
|
|
* @len: Length of the write
|
|
* @flags: Various flags
|
|
* @pagep: Pointer to return the page
|
|
* @fsdata: Pointer to return fs data (unused by GFS2)
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(mapping->host);
|
|
struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
|
|
unsigned requested = 0;
|
|
int alloc_required;
|
|
int error = 0;
|
|
pgoff_t index = pos >> PAGE_SHIFT;
|
|
unsigned from = pos & (PAGE_SIZE - 1);
|
|
struct page *page;
|
|
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
|
|
error = gfs2_glock_nq(&ip->i_gh);
|
|
if (unlikely(error))
|
|
goto out_uninit;
|
|
if (&ip->i_inode == sdp->sd_rindex) {
|
|
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
|
|
GL_NOCACHE, &m_ip->i_gh);
|
|
if (unlikely(error)) {
|
|
gfs2_glock_dq(&ip->i_gh);
|
|
goto out_uninit;
|
|
}
|
|
}
|
|
|
|
alloc_required = gfs2_write_alloc_required(ip, pos, len);
|
|
|
|
if (alloc_required || gfs2_is_jdata(ip))
|
|
gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
|
|
|
|
if (alloc_required) {
|
|
struct gfs2_alloc_parms ap = { .aflags = 0, };
|
|
requested = data_blocks + ind_blocks;
|
|
ap.target = requested;
|
|
error = gfs2_quota_lock_check(ip, &ap);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
error = gfs2_inplace_reserve(ip, &ap);
|
|
if (error)
|
|
goto out_qunlock;
|
|
}
|
|
|
|
rblocks = RES_DINODE + ind_blocks;
|
|
if (gfs2_is_jdata(ip))
|
|
rblocks += data_blocks ? data_blocks : 1;
|
|
if (ind_blocks || data_blocks)
|
|
rblocks += RES_STATFS + RES_QUOTA;
|
|
if (&ip->i_inode == sdp->sd_rindex)
|
|
rblocks += 2 * RES_STATFS;
|
|
if (alloc_required)
|
|
rblocks += gfs2_rg_blocks(ip, requested);
|
|
|
|
error = gfs2_trans_begin(sdp, rblocks,
|
|
PAGE_SIZE/sdp->sd_sb.sb_bsize);
|
|
if (error)
|
|
goto out_trans_fail;
|
|
|
|
error = -ENOMEM;
|
|
flags |= AOP_FLAG_NOFS;
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
*pagep = page;
|
|
if (unlikely(!page))
|
|
goto out_endtrans;
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = 0;
|
|
if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
|
|
error = gfs2_unstuff_dinode(ip, page);
|
|
if (error == 0)
|
|
goto prepare_write;
|
|
} else if (!PageUptodate(page)) {
|
|
error = stuffed_readpage(ip, page);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
prepare_write:
|
|
error = __block_write_begin(page, from, len, gfs2_block_map);
|
|
out:
|
|
if (error == 0)
|
|
return 0;
|
|
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
gfs2_trans_end(sdp);
|
|
if (pos + len > ip->i_inode.i_size)
|
|
gfs2_trim_blocks(&ip->i_inode);
|
|
goto out_trans_fail;
|
|
|
|
out_endtrans:
|
|
gfs2_trans_end(sdp);
|
|
out_trans_fail:
|
|
if (alloc_required) {
|
|
gfs2_inplace_release(ip);
|
|
out_qunlock:
|
|
gfs2_quota_unlock(ip);
|
|
}
|
|
out_unlock:
|
|
if (&ip->i_inode == sdp->sd_rindex) {
|
|
gfs2_glock_dq(&m_ip->i_gh);
|
|
gfs2_holder_uninit(&m_ip->i_gh);
|
|
}
|
|
gfs2_glock_dq(&ip->i_gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&ip->i_gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* adjust_fs_space - Adjusts the free space available due to gfs2_grow
|
|
* @inode: the rindex inode
|
|
*/
|
|
static void adjust_fs_space(struct inode *inode)
|
|
{
|
|
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
|
|
struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct buffer_head *m_bh, *l_bh;
|
|
u64 fs_total, new_free;
|
|
|
|
/* Total up the file system space, according to the latest rindex. */
|
|
fs_total = gfs2_ri_total(sdp);
|
|
if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
|
|
return;
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
gfs2_statfs_change_in(m_sc, m_bh->b_data +
|
|
sizeof(struct gfs2_dinode));
|
|
if (fs_total > (m_sc->sc_total + l_sc->sc_total))
|
|
new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
|
|
else
|
|
new_free = 0;
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
fs_warn(sdp, "File system extended by %llu blocks.\n",
|
|
(unsigned long long)new_free);
|
|
gfs2_statfs_change(sdp, new_free, new_free, 0);
|
|
|
|
if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
|
|
goto out;
|
|
update_statfs(sdp, m_bh, l_bh);
|
|
brelse(l_bh);
|
|
out:
|
|
brelse(m_bh);
|
|
}
|
|
|
|
/**
|
|
* gfs2_stuffed_write_end - Write end for stuffed files
|
|
* @inode: The inode
|
|
* @dibh: The buffer_head containing the on-disk inode
|
|
* @pos: The file position
|
|
* @len: The length of the write
|
|
* @copied: How much was actually copied by the VFS
|
|
* @page: The page
|
|
*
|
|
* This copies the data from the page into the inode block after
|
|
* the inode data structure itself.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
u64 to = pos + copied;
|
|
void *kaddr;
|
|
unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
|
|
|
|
BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
|
|
kaddr = kmap_atomic(page);
|
|
memcpy(buf + pos, kaddr + pos, copied);
|
|
memset(kaddr + pos + copied, 0, len - copied);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr);
|
|
|
|
if (!PageUptodate(page))
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
if (copied) {
|
|
if (inode->i_size < to)
|
|
i_size_write(inode, to);
|
|
mark_inode_dirty(inode);
|
|
}
|
|
|
|
if (inode == sdp->sd_rindex) {
|
|
adjust_fs_space(inode);
|
|
sdp->sd_rindex_uptodate = 0;
|
|
}
|
|
|
|
brelse(dibh);
|
|
gfs2_trans_end(sdp);
|
|
if (inode == sdp->sd_rindex) {
|
|
gfs2_glock_dq(&m_ip->i_gh);
|
|
gfs2_holder_uninit(&m_ip->i_gh);
|
|
}
|
|
gfs2_glock_dq(&ip->i_gh);
|
|
gfs2_holder_uninit(&ip->i_gh);
|
|
return copied;
|
|
}
|
|
|
|
/**
|
|
* gfs2_write_end
|
|
* @file: The file to write to
|
|
* @mapping: The address space to write to
|
|
* @pos: The file position
|
|
* @len: The length of the data
|
|
* @copied: How much was actually copied by the VFS
|
|
* @page: The page that has been written
|
|
* @fsdata: The fsdata (unused in GFS2)
|
|
*
|
|
* The main write_end function for GFS2. We have a separate one for
|
|
* stuffed files as they are slightly different, otherwise we just
|
|
* put our locking around the VFS provided functions.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
static int gfs2_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
|
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
|
|
struct buffer_head *dibh;
|
|
unsigned int from = pos & (PAGE_SIZE - 1);
|
|
unsigned int to = from + len;
|
|
int ret;
|
|
struct gfs2_trans *tr = current->journal_info;
|
|
BUG_ON(!tr);
|
|
|
|
BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
|
|
|
|
ret = gfs2_meta_inode_buffer(ip, &dibh);
|
|
if (unlikely(ret)) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
goto failed;
|
|
}
|
|
|
|
if (gfs2_is_stuffed(ip))
|
|
return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
|
|
|
|
if (!gfs2_is_writeback(ip))
|
|
gfs2_page_add_databufs(ip, page, from, to);
|
|
|
|
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
|
|
if (tr->tr_num_buf_new)
|
|
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
|
|
else
|
|
gfs2_trans_add_meta(ip->i_gl, dibh);
|
|
|
|
|
|
if (inode == sdp->sd_rindex) {
|
|
adjust_fs_space(inode);
|
|
sdp->sd_rindex_uptodate = 0;
|
|
}
|
|
|
|
brelse(dibh);
|
|
failed:
|
|
gfs2_trans_end(sdp);
|
|
gfs2_inplace_release(ip);
|
|
if (ip->i_qadata && ip->i_qadata->qa_qd_num)
|
|
gfs2_quota_unlock(ip);
|
|
if (inode == sdp->sd_rindex) {
|
|
gfs2_glock_dq(&m_ip->i_gh);
|
|
gfs2_holder_uninit(&m_ip->i_gh);
|
|
}
|
|
gfs2_glock_dq(&ip->i_gh);
|
|
gfs2_holder_uninit(&ip->i_gh);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_set_page_dirty - Page dirtying function
|
|
* @page: The page to dirty
|
|
*
|
|
* Returns: 1 if it dirtyed the page, or 0 otherwise
|
|
*/
|
|
|
|
static int gfs2_set_page_dirty(struct page *page)
|
|
{
|
|
SetPageChecked(page);
|
|
return __set_page_dirty_buffers(page);
|
|
}
|
|
|
|
/**
|
|
* gfs2_bmap - Block map function
|
|
* @mapping: Address space info
|
|
* @lblock: The block to map
|
|
*
|
|
* Returns: The disk address for the block or 0 on hole or error
|
|
*/
|
|
|
|
static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(mapping->host);
|
|
struct gfs2_holder i_gh;
|
|
sector_t dblock = 0;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
|
|
if (error)
|
|
return 0;
|
|
|
|
if (!gfs2_is_stuffed(ip))
|
|
dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
|
|
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return dblock;
|
|
}
|
|
|
|
static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
|
|
{
|
|
struct gfs2_bufdata *bd;
|
|
|
|
lock_buffer(bh);
|
|
gfs2_log_lock(sdp);
|
|
clear_buffer_dirty(bh);
|
|
bd = bh->b_private;
|
|
if (bd) {
|
|
if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
|
|
list_del_init(&bd->bd_list);
|
|
else
|
|
gfs2_remove_from_journal(bh, REMOVE_JDATA);
|
|
}
|
|
bh->b_bdev = NULL;
|
|
clear_buffer_mapped(bh);
|
|
clear_buffer_req(bh);
|
|
clear_buffer_new(bh);
|
|
gfs2_log_unlock(sdp);
|
|
unlock_buffer(bh);
|
|
}
|
|
|
|
static void gfs2_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
|
|
unsigned int stop = offset + length;
|
|
int partial_page = (offset || length < PAGE_SIZE);
|
|
struct buffer_head *bh, *head;
|
|
unsigned long pos = 0;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
if (!partial_page)
|
|
ClearPageChecked(page);
|
|
if (!page_has_buffers(page))
|
|
goto out;
|
|
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
if (pos + bh->b_size > stop)
|
|
return;
|
|
|
|
if (offset <= pos)
|
|
gfs2_discard(sdp, bh);
|
|
pos += bh->b_size;
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
out:
|
|
if (!partial_page)
|
|
try_to_release_page(page, 0);
|
|
}
|
|
|
|
/**
|
|
* gfs2_ok_for_dio - check that dio is valid on this file
|
|
* @ip: The inode
|
|
* @offset: The offset at which we are reading or writing
|
|
*
|
|
* Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
|
|
* 1 (to accept the i/o request)
|
|
*/
|
|
static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset)
|
|
{
|
|
/*
|
|
* Should we return an error here? I can't see that O_DIRECT for
|
|
* a stuffed file makes any sense. For now we'll silently fall
|
|
* back to buffered I/O
|
|
*/
|
|
if (gfs2_is_stuffed(ip))
|
|
return 0;
|
|
|
|
if (offset >= i_size_read(&ip->i_inode))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
loff_t offset = iocb->ki_pos;
|
|
struct gfs2_holder gh;
|
|
int rv;
|
|
|
|
/*
|
|
* Deferred lock, even if its a write, since we do no allocation
|
|
* on this path. All we need change is atime, and this lock mode
|
|
* ensures that other nodes have flushed their buffered read caches
|
|
* (i.e. their page cache entries for this inode). We do not,
|
|
* unfortunately have the option of only flushing a range like
|
|
* the VFS does.
|
|
*/
|
|
gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
|
|
rv = gfs2_glock_nq(&gh);
|
|
if (rv)
|
|
goto out_uninit;
|
|
rv = gfs2_ok_for_dio(ip, offset);
|
|
if (rv != 1)
|
|
goto out; /* dio not valid, fall back to buffered i/o */
|
|
|
|
/*
|
|
* Now since we are holding a deferred (CW) lock at this point, you
|
|
* might be wondering why this is ever needed. There is a case however
|
|
* where we've granted a deferred local lock against a cached exclusive
|
|
* glock. That is ok provided all granted local locks are deferred, but
|
|
* it also means that it is possible to encounter pages which are
|
|
* cached and possibly also mapped. So here we check for that and sort
|
|
* them out ahead of the dio. The glock state machine will take care of
|
|
* everything else.
|
|
*
|
|
* If in fact the cached glock state (gl->gl_state) is deferred (CW) in
|
|
* the first place, mapping->nr_pages will always be zero.
|
|
*/
|
|
if (mapping->nrpages) {
|
|
loff_t lstart = offset & ~(PAGE_SIZE - 1);
|
|
loff_t len = iov_iter_count(iter);
|
|
loff_t end = PAGE_ALIGN(offset + len) - 1;
|
|
|
|
rv = 0;
|
|
if (len == 0)
|
|
goto out;
|
|
if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
|
|
unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
|
|
rv = filemap_write_and_wait_range(mapping, lstart, end);
|
|
if (rv)
|
|
goto out;
|
|
if (iov_iter_rw(iter) == WRITE)
|
|
truncate_inode_pages_range(mapping, lstart, end);
|
|
}
|
|
|
|
rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
|
|
gfs2_get_block_direct, NULL, NULL, 0);
|
|
out:
|
|
gfs2_glock_dq(&gh);
|
|
out_uninit:
|
|
gfs2_holder_uninit(&gh);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* gfs2_releasepage - free the metadata associated with a page
|
|
* @page: the page that's being released
|
|
* @gfp_mask: passed from Linux VFS, ignored by us
|
|
*
|
|
* Call try_to_free_buffers() if the buffers in this page can be
|
|
* released.
|
|
*
|
|
* Returns: 0
|
|
*/
|
|
|
|
int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
|
|
struct buffer_head *bh, *head;
|
|
struct gfs2_bufdata *bd;
|
|
|
|
if (!page_has_buffers(page))
|
|
return 0;
|
|
|
|
gfs2_log_lock(sdp);
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
head = bh = page_buffers(page);
|
|
do {
|
|
if (atomic_read(&bh->b_count))
|
|
goto cannot_release;
|
|
bd = bh->b_private;
|
|
if (bd && bd->bd_tr)
|
|
goto cannot_release;
|
|
if (buffer_pinned(bh) || buffer_dirty(bh))
|
|
goto not_possible;
|
|
bh = bh->b_this_page;
|
|
} while(bh != head);
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
|
|
head = bh = page_buffers(page);
|
|
do {
|
|
bd = bh->b_private;
|
|
if (bd) {
|
|
gfs2_assert_warn(sdp, bd->bd_bh == bh);
|
|
if (!list_empty(&bd->bd_list))
|
|
list_del_init(&bd->bd_list);
|
|
bd->bd_bh = NULL;
|
|
bh->b_private = NULL;
|
|
kmem_cache_free(gfs2_bufdata_cachep, bd);
|
|
}
|
|
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
gfs2_log_unlock(sdp);
|
|
|
|
return try_to_free_buffers(page);
|
|
|
|
not_possible: /* Should never happen */
|
|
WARN_ON(buffer_dirty(bh));
|
|
WARN_ON(buffer_pinned(bh));
|
|
cannot_release:
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
gfs2_log_unlock(sdp);
|
|
return 0;
|
|
}
|
|
|
|
static const struct address_space_operations gfs2_writeback_aops = {
|
|
.writepage = gfs2_writepage,
|
|
.writepages = gfs2_writepages,
|
|
.readpage = gfs2_readpage,
|
|
.readpages = gfs2_readpages,
|
|
.write_begin = gfs2_write_begin,
|
|
.write_end = gfs2_write_end,
|
|
.bmap = gfs2_bmap,
|
|
.invalidatepage = gfs2_invalidatepage,
|
|
.releasepage = gfs2_releasepage,
|
|
.direct_IO = gfs2_direct_IO,
|
|
.migratepage = buffer_migrate_page,
|
|
.is_partially_uptodate = block_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
};
|
|
|
|
static const struct address_space_operations gfs2_ordered_aops = {
|
|
.writepage = gfs2_writepage,
|
|
.writepages = gfs2_writepages,
|
|
.readpage = gfs2_readpage,
|
|
.readpages = gfs2_readpages,
|
|
.write_begin = gfs2_write_begin,
|
|
.write_end = gfs2_write_end,
|
|
.set_page_dirty = gfs2_set_page_dirty,
|
|
.bmap = gfs2_bmap,
|
|
.invalidatepage = gfs2_invalidatepage,
|
|
.releasepage = gfs2_releasepage,
|
|
.direct_IO = gfs2_direct_IO,
|
|
.migratepage = buffer_migrate_page,
|
|
.is_partially_uptodate = block_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
};
|
|
|
|
static const struct address_space_operations gfs2_jdata_aops = {
|
|
.writepage = gfs2_jdata_writepage,
|
|
.writepages = gfs2_jdata_writepages,
|
|
.readpage = gfs2_readpage,
|
|
.readpages = gfs2_readpages,
|
|
.write_begin = gfs2_write_begin,
|
|
.write_end = gfs2_write_end,
|
|
.set_page_dirty = gfs2_set_page_dirty,
|
|
.bmap = gfs2_bmap,
|
|
.invalidatepage = gfs2_invalidatepage,
|
|
.releasepage = gfs2_releasepage,
|
|
.is_partially_uptodate = block_is_partially_uptodate,
|
|
.error_remove_page = generic_error_remove_page,
|
|
};
|
|
|
|
void gfs2_set_aops(struct inode *inode)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
|
|
if (gfs2_is_writeback(ip))
|
|
inode->i_mapping->a_ops = &gfs2_writeback_aops;
|
|
else if (gfs2_is_ordered(ip))
|
|
inode->i_mapping->a_ops = &gfs2_ordered_aops;
|
|
else if (gfs2_is_jdata(ip))
|
|
inode->i_mapping->a_ops = &gfs2_jdata_aops;
|
|
else
|
|
BUG();
|
|
}
|
|
|