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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Jens Axboe](/assets/img/avatar_default.png)
With the plugging now being explicitly controlled by the submitter, callers need not pass down unplugging hints to the block layer. If they want to unplug, it's because they manually plugged on their own - in which case, they should just unplug at will. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
455 lines
10 KiB
C
455 lines
10 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/mm.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/swap.h>
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#include <linux/delay.h>
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#include <linux/bio.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct buffer_head *bh, *head;
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int nr_underway = 0;
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int write_op = REQ_META |
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(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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BUG_ON(!PageLocked(page));
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BUG_ON(!page_has_buffers(page));
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head = page_buffers(page);
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bh = head;
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do {
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if (!buffer_mapped(bh))
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continue;
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/*
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* If it's a fully non-blocking write attempt and we cannot
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* lock the buffer then redirty the page. Note that this can
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* potentially cause a busy-wait loop from pdflush and kswapd
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* activity, but those code paths have their own higher-level
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* throttling.
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*/
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if (wbc->sync_mode != WB_SYNC_NONE) {
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lock_buffer(bh);
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} else if (!trylock_buffer(bh)) {
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redirty_page_for_writepage(wbc, page);
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continue;
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}
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if (test_clear_buffer_dirty(bh)) {
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mark_buffer_async_write(bh);
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} else {
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unlock_buffer(bh);
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}
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} while ((bh = bh->b_this_page) != head);
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/*
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* The page and its buffers are protected by PageWriteback(), so we can
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* drop the bh refcounts early.
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*/
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BUG_ON(PageWriteback(page));
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set_page_writeback(page);
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do {
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struct buffer_head *next = bh->b_this_page;
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if (buffer_async_write(bh)) {
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submit_bh(write_op, bh);
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nr_underway++;
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}
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bh = next;
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} while (bh != head);
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unlock_page(page);
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if (nr_underway == 0)
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end_page_writeback(page);
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return 0;
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}
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const struct address_space_operations gfs2_meta_aops = {
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.writepage = gfs2_aspace_writepage,
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.releasepage = gfs2_releasepage,
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};
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/**
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* gfs2_meta_sync - Sync all buffers associated with a glock
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* @gl: The glock
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*
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*/
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void gfs2_meta_sync(struct gfs2_glock *gl)
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{
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struct address_space *mapping = gfs2_glock2aspace(gl);
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int error;
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filemap_fdatawrite(mapping);
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error = filemap_fdatawait(mapping);
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if (error)
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gfs2_io_error(gl->gl_sbd);
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}
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/**
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* gfs2_getbuf - Get a buffer with a given address space
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* @gl: the glock
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* @blkno: the block number (filesystem scope)
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* @create: 1 if the buffer should be created
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*
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* Returns: the buffer
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*/
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struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
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{
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struct address_space *mapping = gfs2_glock2aspace(gl);
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct page *page;
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struct buffer_head *bh;
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unsigned int shift;
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unsigned long index;
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unsigned int bufnum;
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shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift;
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index = blkno >> shift; /* convert block to page */
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bufnum = blkno - (index << shift); /* block buf index within page */
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if (create) {
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for (;;) {
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page = grab_cache_page(mapping, index);
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if (page)
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break;
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yield();
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}
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} else {
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page = find_lock_page(mapping, index);
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if (!page)
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return NULL;
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}
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if (!page_has_buffers(page))
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create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
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/* Locate header for our buffer within our page */
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for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
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/* Do nothing */;
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get_bh(bh);
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if (!buffer_mapped(bh))
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map_bh(bh, sdp->sd_vfs, blkno);
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unlock_page(page);
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mark_page_accessed(page);
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page_cache_release(page);
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return bh;
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}
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static void meta_prep_new(struct buffer_head *bh)
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{
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struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
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lock_buffer(bh);
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clear_buffer_dirty(bh);
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set_buffer_uptodate(bh);
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unlock_buffer(bh);
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mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
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}
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/**
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* gfs2_meta_new - Get a block
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* @gl: The glock associated with this block
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* @blkno: The block number
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*
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* Returns: The buffer
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*/
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struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
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{
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struct buffer_head *bh;
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bh = gfs2_getbuf(gl, blkno, CREATE);
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meta_prep_new(bh);
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return bh;
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}
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/**
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* gfs2_meta_read - Read a block from disk
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* @gl: The glock covering the block
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* @blkno: The block number
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* @flags: flags
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* @bhp: the place where the buffer is returned (NULL on failure)
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*
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* Returns: errno
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*/
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int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
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struct buffer_head **bhp)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct buffer_head *bh;
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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return -EIO;
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*bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
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lock_buffer(bh);
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if (buffer_uptodate(bh)) {
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unlock_buffer(bh);
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return 0;
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}
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bh->b_end_io = end_buffer_read_sync;
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get_bh(bh);
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submit_bh(READ_SYNC | REQ_META, bh);
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if (!(flags & DIO_WAIT))
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return 0;
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wait_on_buffer(bh);
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if (unlikely(!buffer_uptodate(bh))) {
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struct gfs2_trans *tr = current->journal_info;
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if (tr && tr->tr_touched)
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gfs2_io_error_bh(sdp, bh);
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brelse(bh);
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return -EIO;
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}
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return 0;
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}
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/**
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* gfs2_meta_wait - Reread a block from disk
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* @sdp: the filesystem
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* @bh: The block to wait for
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*
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* Returns: errno
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*/
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int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
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{
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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return -EIO;
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wait_on_buffer(bh);
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if (!buffer_uptodate(bh)) {
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struct gfs2_trans *tr = current->journal_info;
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if (tr && tr->tr_touched)
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gfs2_io_error_bh(sdp, bh);
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return -EIO;
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}
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if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
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return -EIO;
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return 0;
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}
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/**
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* gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
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* @gl: the glock the buffer belongs to
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* @bh: The buffer to be attached to
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* @meta: Flag to indicate whether its metadata or not
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*/
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void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
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int meta)
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{
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struct gfs2_bufdata *bd;
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if (meta)
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lock_page(bh->b_page);
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if (bh->b_private) {
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if (meta)
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unlock_page(bh->b_page);
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return;
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}
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bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
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bd->bd_bh = bh;
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bd->bd_gl = gl;
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INIT_LIST_HEAD(&bd->bd_list_tr);
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if (meta)
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lops_init_le(&bd->bd_le, &gfs2_buf_lops);
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else
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lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
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bh->b_private = bd;
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if (meta)
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unlock_page(bh->b_page);
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}
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void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
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{
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struct address_space *mapping = bh->b_page->mapping;
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struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
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struct gfs2_bufdata *bd = bh->b_private;
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if (test_clear_buffer_pinned(bh)) {
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atomic_dec(&sdp->sd_log_pinned);
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list_del_init(&bd->bd_le.le_list);
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if (meta) {
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gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
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sdp->sd_log_num_buf--;
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tr->tr_num_buf_rm++;
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} else {
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gfs2_assert_warn(sdp, sdp->sd_log_num_databuf);
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sdp->sd_log_num_databuf--;
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tr->tr_num_databuf_rm++;
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}
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tr->tr_touched = 1;
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brelse(bh);
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}
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if (bd) {
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if (bd->bd_ail) {
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gfs2_remove_from_ail(bd);
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bh->b_private = NULL;
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bd->bd_bh = NULL;
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bd->bd_blkno = bh->b_blocknr;
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gfs2_trans_add_revoke(sdp, bd);
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}
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}
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clear_buffer_dirty(bh);
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clear_buffer_uptodate(bh);
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}
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/**
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* gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
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* @ip: the inode who owns the buffers
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* @bstart: the first buffer in the run
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* @blen: the number of buffers in the run
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*
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*/
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void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct buffer_head *bh;
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while (blen) {
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bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
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if (bh) {
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lock_buffer(bh);
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gfs2_log_lock(sdp);
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gfs2_remove_from_journal(bh, current->journal_info, 1);
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gfs2_log_unlock(sdp);
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unlock_buffer(bh);
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brelse(bh);
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}
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bstart++;
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blen--;
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}
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}
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/**
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* gfs2_meta_indirect_buffer - Get a metadata buffer
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* @ip: The GFS2 inode
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* @height: The level of this buf in the metadata (indir addr) tree (if any)
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* @num: The block number (device relative) of the buffer
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* @new: Non-zero if we may create a new buffer
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* @bhp: the buffer is returned here
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*
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* Returns: errno
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*/
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int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
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int new, struct buffer_head **bhp)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct gfs2_glock *gl = ip->i_gl;
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struct buffer_head *bh;
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int ret = 0;
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if (new) {
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BUG_ON(height == 0);
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bh = gfs2_meta_new(gl, num);
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gfs2_trans_add_bh(ip->i_gl, bh, 1);
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gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
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gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
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} else {
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u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
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ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
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if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
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brelse(bh);
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ret = -EIO;
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}
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}
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*bhp = bh;
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return ret;
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}
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/**
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* gfs2_meta_ra - start readahead on an extent of a file
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* @gl: the glock the blocks belong to
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* @dblock: the starting disk block
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* @extlen: the number of blocks in the extent
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*
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* returns: the first buffer in the extent
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*/
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struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct buffer_head *first_bh, *bh;
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u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
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sdp->sd_sb.sb_bsize_shift;
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BUG_ON(!extlen);
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if (max_ra < 1)
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max_ra = 1;
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if (extlen > max_ra)
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extlen = max_ra;
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first_bh = gfs2_getbuf(gl, dblock, CREATE);
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if (buffer_uptodate(first_bh))
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goto out;
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if (!buffer_locked(first_bh))
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ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
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dblock++;
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extlen--;
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while (extlen) {
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bh = gfs2_getbuf(gl, dblock, CREATE);
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if (!buffer_uptodate(bh) && !buffer_locked(bh))
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ll_rw_block(READA, 1, &bh);
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brelse(bh);
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dblock++;
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extlen--;
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if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
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goto out;
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}
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wait_on_buffer(first_bh);
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out:
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return first_bh;
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}
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