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8cc67f704f
When gfs2 withdraws a file system, it calls signal_our_withdraw which triggers another node to replay the withdrawing node's journal. Then it waits until it knows the journal has been replayed. Part of this wait is to repeatedly call check_journal_clean which calls gfs2_jdesc_check, which checks to see if the journal is sane. As part of its sanity checks it needs to re-read its journal's metadata. But with today's code, any attempt to re-read the metadata results in -EIO because of a check for the file system withdraw in function gfs2_meta_wait. This patch adds an additional check for SDF_WITHDRAW_IN_PROG, to tell if the read is done while the withdraw is in progress. In that case we allow the metadata read to not be rejected. Therefore the metadata check is done properly, so the withdraw sequence can finish normally. Signed-off-by: Bob Peterson <rpeterso@redhat.com>
553 lines
13 KiB
C
553 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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#include "trace_gfs2.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_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc);
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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 flusher thread 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(REQ_OP_WRITE, write_flags, 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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.set_page_dirty = __set_page_dirty_buffers,
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.writepage = gfs2_aspace_writepage,
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.releasepage = gfs2_releasepage,
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};
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const struct address_space_operations gfs2_rgrp_aops = {
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.set_page_dirty = __set_page_dirty_buffers,
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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_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_name.ln_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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if (mapping == NULL)
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mapping = &sdp->sd_aspace;
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shift = PAGE_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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if (!page_has_buffers(page))
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create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
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} else {
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page = find_get_page_flags(mapping, index,
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FGP_LOCK|FGP_ACCESSED);
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if (!page)
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return NULL;
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if (!page_has_buffers(page)) {
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bh = NULL;
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goto out_unlock;
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}
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}
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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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out_unlock:
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unlock_page(page);
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put_page(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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static void gfs2_meta_read_endio(struct bio *bio)
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{
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struct bio_vec *bvec;
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struct bvec_iter_all iter_all;
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bio_for_each_segment_all(bvec, bio, iter_all) {
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struct page *page = bvec->bv_page;
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struct buffer_head *bh = page_buffers(page);
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unsigned int len = bvec->bv_len;
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while (bh_offset(bh) < bvec->bv_offset)
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bh = bh->b_this_page;
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do {
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struct buffer_head *next = bh->b_this_page;
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len -= bh->b_size;
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bh->b_end_io(bh, !bio->bi_status);
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bh = next;
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} while (bh && len);
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}
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bio_put(bio);
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}
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/*
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* Submit several consecutive buffer head I/O requests as a single bio I/O
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* request. (See submit_bh_wbc.)
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*/
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static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[],
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int num)
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{
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while (num > 0) {
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struct buffer_head *bh = *bhs;
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struct bio *bio;
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bio = bio_alloc(GFP_NOIO, num);
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bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
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bio_set_dev(bio, bh->b_bdev);
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while (num > 0) {
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bh = *bhs;
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if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) {
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BUG_ON(bio->bi_iter.bi_size == 0);
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break;
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}
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bhs++;
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num--;
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}
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bio->bi_end_io = gfs2_meta_read_endio;
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bio_set_op_attrs(bio, op, op_flags);
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submit_bio(bio);
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}
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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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* @rahead: Do read-ahead
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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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int rahead, struct buffer_head **bhp)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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struct buffer_head *bh, *bhs[2];
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int num = 0;
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if (unlikely(gfs2_withdrawn(sdp)) && !gfs2_withdraw_in_prog(sdp)) {
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*bhp = NULL;
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return -EIO;
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}
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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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flags &= ~DIO_WAIT;
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} else {
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bh->b_end_io = end_buffer_read_sync;
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get_bh(bh);
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bhs[num++] = bh;
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}
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if (rahead) {
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bh = gfs2_getbuf(gl, blkno + 1, 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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brelse(bh);
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} else {
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bh->b_end_io = end_buffer_read_sync;
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bhs[num++] = bh;
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}
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}
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gfs2_submit_bhs(REQ_OP_READ, REQ_META | REQ_PRIO, bhs, num);
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if (!(flags & DIO_WAIT))
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return 0;
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bh = *bhp;
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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 && test_bit(TR_TOUCHED, &tr->tr_flags))
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gfs2_io_error_bh_wd(sdp, bh);
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brelse(bh);
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*bhp = NULL;
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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(gfs2_withdrawn(sdp)) && !gfs2_withdraw_in_prog(sdp))
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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 && test_bit(TR_TOUCHED, &tr->tr_flags))
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gfs2_io_error_bh_wd(sdp, bh);
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return -EIO;
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}
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if (unlikely(gfs2_withdrawn(sdp)) && !gfs2_withdraw_in_prog(sdp))
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return -EIO;
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return 0;
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}
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void gfs2_remove_from_journal(struct buffer_head *bh, 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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struct gfs2_trans *tr = current->journal_info;
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int was_pinned = 0;
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if (test_clear_buffer_pinned(bh)) {
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trace_gfs2_pin(bd, 0);
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atomic_dec(&sdp->sd_log_pinned);
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list_del_init(&bd->bd_list);
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if (meta == REMOVE_META)
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tr->tr_num_buf_rm++;
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else
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tr->tr_num_databuf_rm++;
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set_bit(TR_TOUCHED, &tr->tr_flags);
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was_pinned = 1;
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brelse(bh);
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}
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if (bd) {
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if (bd->bd_tr) {
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gfs2_trans_add_revoke(sdp, bd);
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} else if (was_pinned) {
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bh->b_private = NULL;
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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} else if (!list_empty(&bd->bd_ail_st_list) &&
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!list_empty(&bd->bd_ail_gl_list)) {
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gfs2_remove_from_ail(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_ail1_wipe - remove deleted/freed buffers from the ail1 list
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* @sdp: superblock
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* @bstart: starting block address of buffers to remove
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* @blen: length of buffers to be removed
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*
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* This function is called from gfs2_journal wipe, whose job is to remove
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* buffers, corresponding to deleted blocks, from the journal. If we find any
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* bufdata elements on the system ail1 list, they haven't been written to
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* the journal yet. So we remove them.
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*/
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static void gfs2_ail1_wipe(struct gfs2_sbd *sdp, u64 bstart, u32 blen)
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{
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struct gfs2_trans *tr, *s;
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struct gfs2_bufdata *bd, *bs;
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struct buffer_head *bh;
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u64 end = bstart + blen;
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gfs2_log_lock(sdp);
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe(tr, s, &sdp->sd_ail1_list, tr_list) {
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list_for_each_entry_safe(bd, bs, &tr->tr_ail1_list,
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bd_ail_st_list) {
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bh = bd->bd_bh;
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if (bh->b_blocknr < bstart || bh->b_blocknr >= end)
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continue;
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gfs2_remove_from_journal(bh, REMOVE_JDATA);
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}
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}
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spin_unlock(&sdp->sd_ail_lock);
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gfs2_log_unlock(sdp);
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}
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static struct buffer_head *gfs2_getjdatabuf(struct gfs2_inode *ip, u64 blkno)
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{
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struct address_space *mapping = ip->i_inode.i_mapping;
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct page *page;
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struct buffer_head *bh;
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unsigned int shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
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unsigned long index = blkno >> shift; /* convert block to page */
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unsigned int bufnum = blkno - (index << shift);
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page = find_get_page_flags(mapping, index, FGP_LOCK|FGP_ACCESSED);
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if (!page)
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return NULL;
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if (!page_has_buffers(page)) {
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unlock_page(page);
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put_page(page);
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return NULL;
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}
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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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unlock_page(page);
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put_page(page);
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return bh;
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}
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/**
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* gfs2_journal_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_journal_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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int ty;
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gfs2_ail1_wipe(sdp, bstart, blen);
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while (blen) {
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ty = REMOVE_META;
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bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
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if (!bh && gfs2_is_jdata(ip)) {
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bh = gfs2_getjdatabuf(ip, bstart);
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ty = REMOVE_JDATA;
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}
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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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spin_lock(&sdp->sd_ail_lock);
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gfs2_remove_from_journal(bh, ty);
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spin_unlock(&sdp->sd_ail_lock);
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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_buffer - Get a metadata buffer
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* @ip: The GFS2 inode
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* @mtype: The block type (GFS2_METATYPE_*)
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* @num: The block number (device relative) of the 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_buffer(struct gfs2_inode *ip, u32 mtype, u64 num,
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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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int rahead = 0;
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if (num == ip->i_no_addr)
|
|
rahead = ip->i_rahead;
|
|
|
|
ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
|
|
if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
|
|
brelse(bh);
|
|
ret = -EIO;
|
|
} else {
|
|
*bhp = bh;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gfs2_meta_ra - start readahead on an extent of a file
|
|
* @gl: the glock the blocks belong to
|
|
* @dblock: the starting disk block
|
|
* @extlen: the number of blocks in the extent
|
|
*
|
|
* returns: the first buffer in the extent
|
|
*/
|
|
|
|
struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
|
|
{
|
|
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
|
|
struct buffer_head *first_bh, *bh;
|
|
u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
|
|
sdp->sd_sb.sb_bsize_shift;
|
|
|
|
BUG_ON(!extlen);
|
|
|
|
if (max_ra < 1)
|
|
max_ra = 1;
|
|
if (extlen > max_ra)
|
|
extlen = max_ra;
|
|
|
|
first_bh = gfs2_getbuf(gl, dblock, CREATE);
|
|
|
|
if (buffer_uptodate(first_bh))
|
|
goto out;
|
|
if (!buffer_locked(first_bh))
|
|
ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &first_bh);
|
|
|
|
dblock++;
|
|
extlen--;
|
|
|
|
while (extlen) {
|
|
bh = gfs2_getbuf(gl, dblock, CREATE);
|
|
|
|
if (!buffer_uptodate(bh) && !buffer_locked(bh))
|
|
ll_rw_block(REQ_OP_READ,
|
|
REQ_RAHEAD | REQ_META | REQ_PRIO,
|
|
1, &bh);
|
|
brelse(bh);
|
|
dblock++;
|
|
extlen--;
|
|
if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
|
|
goto out;
|
|
}
|
|
|
|
wait_on_buffer(first_bh);
|
|
out:
|
|
return first_bh;
|
|
}
|
|
|