1360 строки
37 KiB
C
1360 строки
37 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) 2004-2007 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/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/crc32c.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/writeback.h>
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#include <linux/list_sort.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 "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "util.h"
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#include "dir.h"
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#include "trace_gfs2.h"
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#include "trans.h"
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static void gfs2_log_shutdown(struct gfs2_sbd *sdp);
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/**
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* gfs2_struct2blk - compute stuff
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* @sdp: the filesystem
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* @nstruct: the number of structures
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*
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* Compute the number of log descriptor blocks needed to hold a certain number
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* of structures of a certain size.
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*
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* Returns: the number of blocks needed (minimum is always 1)
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*/
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unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct)
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{
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unsigned int blks;
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unsigned int first, second;
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/* The initial struct gfs2_log_descriptor block */
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blks = 1;
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first = sdp->sd_ldptrs;
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if (nstruct > first) {
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/* Subsequent struct gfs2_meta_header blocks */
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second = sdp->sd_inptrs;
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blks += DIV_ROUND_UP(nstruct - first, second);
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}
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return blks;
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}
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/**
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* gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
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* @bd: The gfs2_bufdata to remove
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*
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* The ail lock _must_ be held when calling this function
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*
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*/
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void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
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{
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bd->bd_tr = NULL;
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list_del_init(&bd->bd_ail_st_list);
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list_del_init(&bd->bd_ail_gl_list);
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atomic_dec(&bd->bd_gl->gl_ail_count);
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brelse(bd->bd_bh);
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}
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static int __gfs2_writepage(struct page *page, struct writeback_control *wbc,
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void *data)
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{
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struct address_space *mapping = data;
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int ret = mapping->a_ops->writepage(page, wbc);
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mapping_set_error(mapping, ret);
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return ret;
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}
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/**
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* gfs2_ail1_start_one - Start I/O on a transaction
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* @sdp: The superblock
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* @wbc: The writeback control structure
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* @tr: The transaction to start I/O on
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* @plug: The block plug currently active
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*/
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static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
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struct writeback_control *wbc,
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struct gfs2_trans *tr, struct blk_plug *plug)
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__releases(&sdp->sd_ail_lock)
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__acquires(&sdp->sd_ail_lock)
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{
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struct gfs2_glock *gl = NULL;
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struct address_space *mapping;
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struct gfs2_bufdata *bd, *s;
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struct buffer_head *bh;
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int ret = 0;
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list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, bd_ail_st_list) {
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bh = bd->bd_bh;
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gfs2_assert(sdp, bd->bd_tr == tr);
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if (!buffer_busy(bh)) {
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if (buffer_uptodate(bh)) {
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list_move(&bd->bd_ail_st_list,
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&tr->tr_ail2_list);
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continue;
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}
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if (!cmpxchg(&sdp->sd_log_error, 0, -EIO)) {
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gfs2_io_error_bh(sdp, bh);
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gfs2_withdraw_delayed(sdp);
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}
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}
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if (gfs2_withdrawn(sdp)) {
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gfs2_remove_from_ail(bd);
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continue;
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}
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if (!buffer_dirty(bh))
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continue;
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if (gl == bd->bd_gl)
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continue;
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gl = bd->bd_gl;
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list_move(&bd->bd_ail_st_list, &tr->tr_ail1_list);
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mapping = bh->b_page->mapping;
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if (!mapping)
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continue;
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spin_unlock(&sdp->sd_ail_lock);
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ret = write_cache_pages(mapping, wbc, __gfs2_writepage, mapping);
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if (need_resched()) {
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blk_finish_plug(plug);
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cond_resched();
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blk_start_plug(plug);
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}
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spin_lock(&sdp->sd_ail_lock);
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if (ret == -ENODATA) /* if a jdata write into a new hole */
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ret = 0; /* ignore it */
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if (ret || wbc->nr_to_write <= 0)
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break;
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return -EBUSY;
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}
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return ret;
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}
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static void dump_ail_list(struct gfs2_sbd *sdp)
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{
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struct gfs2_trans *tr;
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struct gfs2_bufdata *bd;
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struct buffer_head *bh;
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list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
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list_for_each_entry_reverse(bd, &tr->tr_ail1_list,
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bd_ail_st_list) {
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bh = bd->bd_bh;
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fs_err(sdp, "bd %p: blk:0x%llx bh=%p ", bd,
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(unsigned long long)bd->bd_blkno, bh);
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if (!bh) {
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fs_err(sdp, "\n");
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continue;
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}
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fs_err(sdp, "0x%llx up2:%d dirt:%d lkd:%d req:%d "
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"map:%d new:%d ar:%d aw:%d delay:%d "
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"io err:%d unwritten:%d dfr:%d pin:%d esc:%d\n",
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(unsigned long long)bh->b_blocknr,
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buffer_uptodate(bh), buffer_dirty(bh),
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buffer_locked(bh), buffer_req(bh),
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buffer_mapped(bh), buffer_new(bh),
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buffer_async_read(bh), buffer_async_write(bh),
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buffer_delay(bh), buffer_write_io_error(bh),
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buffer_unwritten(bh),
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buffer_defer_completion(bh),
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buffer_pinned(bh), buffer_escaped(bh));
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}
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}
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}
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/**
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* gfs2_ail1_flush - start writeback of some ail1 entries
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* @sdp: The super block
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* @wbc: The writeback control structure
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*
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* Writes back some ail1 entries, according to the limits in the
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* writeback control structure
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*/
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void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
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{
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struct list_head *head = &sdp->sd_ail1_list;
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struct gfs2_trans *tr;
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struct blk_plug plug;
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int ret;
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unsigned long flush_start = jiffies;
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trace_gfs2_ail_flush(sdp, wbc, 1);
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blk_start_plug(&plug);
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spin_lock(&sdp->sd_ail_lock);
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restart:
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ret = 0;
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if (time_after(jiffies, flush_start + (HZ * 600))) {
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fs_err(sdp, "Error: In %s for ten minutes! t=%d\n",
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__func__, current->journal_info ? 1 : 0);
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dump_ail_list(sdp);
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goto out;
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}
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list_for_each_entry_reverse(tr, head, tr_list) {
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if (wbc->nr_to_write <= 0)
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break;
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ret = gfs2_ail1_start_one(sdp, wbc, tr, &plug);
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if (ret) {
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if (ret == -EBUSY)
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goto restart;
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break;
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}
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}
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out:
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spin_unlock(&sdp->sd_ail_lock);
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blk_finish_plug(&plug);
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if (ret) {
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gfs2_lm(sdp, "gfs2_ail1_start_one returned: %d\n", ret);
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gfs2_withdraw(sdp);
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}
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trace_gfs2_ail_flush(sdp, wbc, 0);
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}
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/**
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* gfs2_ail1_start - start writeback of all ail1 entries
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* @sdp: The superblock
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*/
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static void gfs2_ail1_start(struct gfs2_sbd *sdp)
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{
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struct writeback_control wbc = {
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.sync_mode = WB_SYNC_NONE,
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.nr_to_write = LONG_MAX,
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.range_start = 0,
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.range_end = LLONG_MAX,
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};
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return gfs2_ail1_flush(sdp, &wbc);
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}
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static void gfs2_log_update_flush_tail(struct gfs2_sbd *sdp)
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{
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unsigned int new_flush_tail = sdp->sd_log_head;
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struct gfs2_trans *tr;
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if (!list_empty(&sdp->sd_ail1_list)) {
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tr = list_last_entry(&sdp->sd_ail1_list,
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struct gfs2_trans, tr_list);
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new_flush_tail = tr->tr_first;
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}
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sdp->sd_log_flush_tail = new_flush_tail;
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}
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static void gfs2_log_update_head(struct gfs2_sbd *sdp)
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{
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unsigned int new_head = sdp->sd_log_flush_head;
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if (sdp->sd_log_flush_tail == sdp->sd_log_head)
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sdp->sd_log_flush_tail = new_head;
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sdp->sd_log_head = new_head;
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}
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/*
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* gfs2_ail_empty_tr - empty one of the ail lists of a transaction
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*/
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static void gfs2_ail_empty_tr(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
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struct list_head *head)
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{
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struct gfs2_bufdata *bd;
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while (!list_empty(head)) {
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bd = list_first_entry(head, struct gfs2_bufdata,
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bd_ail_st_list);
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gfs2_assert(sdp, bd->bd_tr == tr);
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gfs2_remove_from_ail(bd);
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}
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}
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/**
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* gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
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* @sdp: the filesystem
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* @tr: the transaction
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* @max_revokes: If nonzero, issue revokes for the bd items for written buffers
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*
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* returns: the transaction's count of remaining active items
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*/
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static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
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int *max_revokes)
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{
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struct gfs2_bufdata *bd, *s;
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struct buffer_head *bh;
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int active_count = 0;
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list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list,
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bd_ail_st_list) {
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bh = bd->bd_bh;
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gfs2_assert(sdp, bd->bd_tr == tr);
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/*
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* If another process flagged an io error, e.g. writing to the
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* journal, error all other bhs and move them off the ail1 to
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* prevent a tight loop when unmount tries to flush ail1,
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* regardless of whether they're still busy. If no outside
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* errors were found and the buffer is busy, move to the next.
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* If the ail buffer is not busy and caught an error, flag it
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* for others.
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*/
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if (!sdp->sd_log_error && buffer_busy(bh)) {
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active_count++;
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continue;
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}
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if (!buffer_uptodate(bh) &&
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!cmpxchg(&sdp->sd_log_error, 0, -EIO)) {
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gfs2_io_error_bh(sdp, bh);
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gfs2_withdraw_delayed(sdp);
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}
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/*
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* If we have space for revokes and the bd is no longer on any
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* buf list, we can just add a revoke for it immediately and
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* avoid having to put it on the ail2 list, where it would need
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* to be revoked later.
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*/
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if (*max_revokes && list_empty(&bd->bd_list)) {
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gfs2_add_revoke(sdp, bd);
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(*max_revokes)--;
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continue;
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}
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list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
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}
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return active_count;
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}
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/**
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* gfs2_ail1_empty - Try to empty the ail1 lists
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* @sdp: The superblock
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* @max_revokes: If non-zero, add revokes where appropriate
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*
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* Tries to empty the ail1 lists, starting with the oldest first
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*/
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static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int max_revokes)
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{
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struct gfs2_trans *tr, *s;
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int oldest_tr = 1;
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int ret;
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe_reverse(tr, s, &sdp->sd_ail1_list, tr_list) {
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if (!gfs2_ail1_empty_one(sdp, tr, &max_revokes) && oldest_tr)
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list_move(&tr->tr_list, &sdp->sd_ail2_list);
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else
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oldest_tr = 0;
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}
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gfs2_log_update_flush_tail(sdp);
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ret = list_empty(&sdp->sd_ail1_list);
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spin_unlock(&sdp->sd_ail_lock);
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if (test_bit(SDF_WITHDRAWING, &sdp->sd_flags)) {
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gfs2_lm(sdp, "fatal: I/O error(s)\n");
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gfs2_withdraw(sdp);
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}
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return ret;
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}
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static void gfs2_ail1_wait(struct gfs2_sbd *sdp)
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{
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struct gfs2_trans *tr;
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struct gfs2_bufdata *bd;
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struct buffer_head *bh;
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
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list_for_each_entry(bd, &tr->tr_ail1_list, bd_ail_st_list) {
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bh = bd->bd_bh;
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if (!buffer_locked(bh))
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continue;
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get_bh(bh);
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spin_unlock(&sdp->sd_ail_lock);
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wait_on_buffer(bh);
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brelse(bh);
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return;
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}
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}
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spin_unlock(&sdp->sd_ail_lock);
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}
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static void __ail2_empty(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
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{
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gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list);
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list_del(&tr->tr_list);
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gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
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gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
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gfs2_trans_free(sdp, tr);
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}
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static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
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{
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struct list_head *ail2_list = &sdp->sd_ail2_list;
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unsigned int old_tail = sdp->sd_log_tail;
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struct gfs2_trans *tr, *safe;
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spin_lock(&sdp->sd_ail_lock);
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if (old_tail <= new_tail) {
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list_for_each_entry_safe(tr, safe, ail2_list, tr_list) {
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if (old_tail <= tr->tr_first && tr->tr_first < new_tail)
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__ail2_empty(sdp, tr);
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}
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} else {
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list_for_each_entry_safe(tr, safe, ail2_list, tr_list) {
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if (old_tail <= tr->tr_first || tr->tr_first < new_tail)
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__ail2_empty(sdp, tr);
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}
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}
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spin_unlock(&sdp->sd_ail_lock);
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}
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/**
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* gfs2_log_is_empty - Check if the log is empty
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* @sdp: The GFS2 superblock
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*/
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bool gfs2_log_is_empty(struct gfs2_sbd *sdp) {
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return atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks;
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}
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static bool __gfs2_log_try_reserve_revokes(struct gfs2_sbd *sdp, unsigned int revokes)
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{
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unsigned int available;
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available = atomic_read(&sdp->sd_log_revokes_available);
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while (available >= revokes) {
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if (atomic_try_cmpxchg(&sdp->sd_log_revokes_available,
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&available, available - revokes))
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return true;
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}
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return false;
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}
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/**
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* gfs2_log_release_revokes - Release a given number of revokes
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* @sdp: The GFS2 superblock
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* @revokes: The number of revokes to release
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*
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* sdp->sd_log_flush_lock must be held.
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*/
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void gfs2_log_release_revokes(struct gfs2_sbd *sdp, unsigned int revokes)
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{
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if (revokes)
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atomic_add(revokes, &sdp->sd_log_revokes_available);
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}
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/**
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* gfs2_log_release - Release a given number of log blocks
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* @sdp: The GFS2 superblock
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* @blks: The number of blocks
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*
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*/
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void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
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{
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atomic_add(blks, &sdp->sd_log_blks_free);
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trace_gfs2_log_blocks(sdp, blks);
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gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
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sdp->sd_jdesc->jd_blocks);
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if (atomic_read(&sdp->sd_log_blks_needed))
|
|
wake_up(&sdp->sd_log_waitq);
|
|
}
|
|
|
|
/**
|
|
* __gfs2_log_try_reserve - Try to make a log reservation
|
|
* @sdp: The GFS2 superblock
|
|
* @blks: The number of blocks to reserve
|
|
* @taboo_blks: The number of blocks to leave free
|
|
*
|
|
* Try to do the same as __gfs2_log_reserve(), but fail if no more log
|
|
* space is immediately available.
|
|
*/
|
|
static bool __gfs2_log_try_reserve(struct gfs2_sbd *sdp, unsigned int blks,
|
|
unsigned int taboo_blks)
|
|
{
|
|
unsigned wanted = blks + taboo_blks;
|
|
unsigned int free_blocks;
|
|
|
|
free_blocks = atomic_read(&sdp->sd_log_blks_free);
|
|
while (free_blocks >= wanted) {
|
|
if (atomic_try_cmpxchg(&sdp->sd_log_blks_free, &free_blocks,
|
|
free_blocks - blks)) {
|
|
trace_gfs2_log_blocks(sdp, -blks);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* __gfs2_log_reserve - Make a log reservation
|
|
* @sdp: The GFS2 superblock
|
|
* @blks: The number of blocks to reserve
|
|
* @taboo_blks: The number of blocks to leave free
|
|
*
|
|
* @taboo_blks is set to 0 for logd, and to GFS2_LOG_FLUSH_MIN_BLOCKS
|
|
* for all other processes. This ensures that when the log is almost full,
|
|
* logd will still be able to call gfs2_log_flush one more time without
|
|
* blocking, which will advance the tail and make some more log space
|
|
* available.
|
|
*
|
|
* We no longer flush the log here, instead we wake up logd to do that
|
|
* for us. To avoid the thundering herd and to ensure that we deal fairly
|
|
* with queued waiters, we use an exclusive wait. This means that when we
|
|
* get woken with enough journal space to get our reservation, we need to
|
|
* wake the next waiter on the list.
|
|
*/
|
|
|
|
static void __gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks,
|
|
unsigned int taboo_blks)
|
|
{
|
|
unsigned wanted = blks + taboo_blks;
|
|
unsigned int free_blocks;
|
|
|
|
atomic_add(blks, &sdp->sd_log_blks_needed);
|
|
for (;;) {
|
|
if (current != sdp->sd_logd_process)
|
|
wake_up(&sdp->sd_logd_waitq);
|
|
io_wait_event(sdp->sd_log_waitq,
|
|
(free_blocks = atomic_read(&sdp->sd_log_blks_free),
|
|
free_blocks >= wanted));
|
|
do {
|
|
if (atomic_try_cmpxchg(&sdp->sd_log_blks_free,
|
|
&free_blocks,
|
|
free_blocks - blks))
|
|
goto reserved;
|
|
} while (free_blocks >= wanted);
|
|
}
|
|
|
|
reserved:
|
|
trace_gfs2_log_blocks(sdp, -blks);
|
|
if (atomic_sub_return(blks, &sdp->sd_log_blks_needed))
|
|
wake_up(&sdp->sd_log_waitq);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_try_reserve - Try to make a log reservation
|
|
* @sdp: The GFS2 superblock
|
|
* @tr: The transaction
|
|
* @extra_revokes: The number of additional revokes reserved (output)
|
|
*
|
|
* This is similar to gfs2_log_reserve, but sdp->sd_log_flush_lock must be
|
|
* held for correct revoke accounting.
|
|
*/
|
|
|
|
bool gfs2_log_try_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
|
|
unsigned int *extra_revokes)
|
|
{
|
|
unsigned int blks = tr->tr_reserved;
|
|
unsigned int revokes = tr->tr_revokes;
|
|
unsigned int revoke_blks = 0;
|
|
|
|
*extra_revokes = 0;
|
|
if (revokes && !__gfs2_log_try_reserve_revokes(sdp, revokes)) {
|
|
revoke_blks = DIV_ROUND_UP(revokes, sdp->sd_inptrs);
|
|
*extra_revokes = revoke_blks * sdp->sd_inptrs - revokes;
|
|
blks += revoke_blks;
|
|
}
|
|
if (!blks)
|
|
return true;
|
|
if (__gfs2_log_try_reserve(sdp, blks, GFS2_LOG_FLUSH_MIN_BLOCKS))
|
|
return true;
|
|
if (!revoke_blks)
|
|
gfs2_log_release_revokes(sdp, revokes);
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_reserve - Make a log reservation
|
|
* @sdp: The GFS2 superblock
|
|
* @tr: The transaction
|
|
* @extra_revokes: The number of additional revokes reserved (output)
|
|
*
|
|
* sdp->sd_log_flush_lock must not be held.
|
|
*/
|
|
|
|
void gfs2_log_reserve(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
|
|
unsigned int *extra_revokes)
|
|
{
|
|
unsigned int blks = tr->tr_reserved;
|
|
unsigned int revokes = tr->tr_revokes;
|
|
unsigned int revoke_blks;
|
|
|
|
*extra_revokes = 0;
|
|
if (revokes) {
|
|
revoke_blks = DIV_ROUND_UP(revokes, sdp->sd_inptrs);
|
|
*extra_revokes = revoke_blks * sdp->sd_inptrs - revokes;
|
|
blks += revoke_blks;
|
|
}
|
|
__gfs2_log_reserve(sdp, blks, GFS2_LOG_FLUSH_MIN_BLOCKS);
|
|
}
|
|
|
|
/**
|
|
* log_distance - Compute distance between two journal blocks
|
|
* @sdp: The GFS2 superblock
|
|
* @newer: The most recent journal block of the pair
|
|
* @older: The older journal block of the pair
|
|
*
|
|
* Compute the distance (in the journal direction) between two
|
|
* blocks in the journal
|
|
*
|
|
* Returns: the distance in blocks
|
|
*/
|
|
|
|
static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
|
|
unsigned int older)
|
|
{
|
|
int dist;
|
|
|
|
dist = newer - older;
|
|
if (dist < 0)
|
|
dist += sdp->sd_jdesc->jd_blocks;
|
|
|
|
return dist;
|
|
}
|
|
|
|
/**
|
|
* calc_reserved - Calculate the number of blocks to keep reserved
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* This is complex. We need to reserve room for all our currently used
|
|
* metadata blocks (e.g. normal file I/O rewriting file time stamps) and
|
|
* all our journaled data blocks for journaled files (e.g. files in the
|
|
* meta_fs like rindex, or files for which chattr +j was done.)
|
|
* If we don't reserve enough space, corruption will follow.
|
|
*
|
|
* We can have metadata blocks and jdata blocks in the same journal. Each
|
|
* type gets its own log descriptor, for which we need to reserve a block.
|
|
* In fact, each type has the potential for needing more than one log descriptor
|
|
* in cases where we have more blocks than will fit in a log descriptor.
|
|
* Metadata journal entries take up half the space of journaled buffer entries.
|
|
*
|
|
* Also, we need to reserve blocks for revoke journal entries and one for an
|
|
* overall header for the lot.
|
|
*
|
|
* Returns: the number of blocks reserved
|
|
*/
|
|
static unsigned int calc_reserved(struct gfs2_sbd *sdp)
|
|
{
|
|
unsigned int reserved = GFS2_LOG_FLUSH_MIN_BLOCKS;
|
|
unsigned int blocks;
|
|
struct gfs2_trans *tr = sdp->sd_log_tr;
|
|
|
|
if (tr) {
|
|
blocks = tr->tr_num_buf_new - tr->tr_num_buf_rm;
|
|
reserved += blocks + DIV_ROUND_UP(blocks, buf_limit(sdp));
|
|
blocks = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
|
|
reserved += blocks + DIV_ROUND_UP(blocks, databuf_limit(sdp));
|
|
}
|
|
return reserved;
|
|
}
|
|
|
|
static void log_pull_tail(struct gfs2_sbd *sdp)
|
|
{
|
|
unsigned int new_tail = sdp->sd_log_flush_tail;
|
|
unsigned int dist;
|
|
|
|
if (new_tail == sdp->sd_log_tail)
|
|
return;
|
|
dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
|
|
ail2_empty(sdp, new_tail);
|
|
gfs2_log_release(sdp, dist);
|
|
sdp->sd_log_tail = new_tail;
|
|
}
|
|
|
|
|
|
void log_flush_wait(struct gfs2_sbd *sdp)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (atomic_read(&sdp->sd_log_in_flight)) {
|
|
do {
|
|
prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (atomic_read(&sdp->sd_log_in_flight))
|
|
io_schedule();
|
|
} while(atomic_read(&sdp->sd_log_in_flight));
|
|
finish_wait(&sdp->sd_log_flush_wait, &wait);
|
|
}
|
|
}
|
|
|
|
static int ip_cmp(void *priv, const struct list_head *a, const struct list_head *b)
|
|
{
|
|
struct gfs2_inode *ipa, *ipb;
|
|
|
|
ipa = list_entry(a, struct gfs2_inode, i_ordered);
|
|
ipb = list_entry(b, struct gfs2_inode, i_ordered);
|
|
|
|
if (ipa->i_no_addr < ipb->i_no_addr)
|
|
return -1;
|
|
if (ipa->i_no_addr > ipb->i_no_addr)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void __ordered_del_inode(struct gfs2_inode *ip)
|
|
{
|
|
if (!list_empty(&ip->i_ordered))
|
|
list_del_init(&ip->i_ordered);
|
|
}
|
|
|
|
static void gfs2_ordered_write(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *ip;
|
|
LIST_HEAD(written);
|
|
|
|
spin_lock(&sdp->sd_ordered_lock);
|
|
list_sort(NULL, &sdp->sd_log_ordered, &ip_cmp);
|
|
while (!list_empty(&sdp->sd_log_ordered)) {
|
|
ip = list_first_entry(&sdp->sd_log_ordered, struct gfs2_inode, i_ordered);
|
|
if (ip->i_inode.i_mapping->nrpages == 0) {
|
|
__ordered_del_inode(ip);
|
|
continue;
|
|
}
|
|
list_move(&ip->i_ordered, &written);
|
|
spin_unlock(&sdp->sd_ordered_lock);
|
|
filemap_fdatawrite(ip->i_inode.i_mapping);
|
|
spin_lock(&sdp->sd_ordered_lock);
|
|
}
|
|
list_splice(&written, &sdp->sd_log_ordered);
|
|
spin_unlock(&sdp->sd_ordered_lock);
|
|
}
|
|
|
|
static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_inode *ip;
|
|
|
|
spin_lock(&sdp->sd_ordered_lock);
|
|
while (!list_empty(&sdp->sd_log_ordered)) {
|
|
ip = list_first_entry(&sdp->sd_log_ordered, struct gfs2_inode, i_ordered);
|
|
__ordered_del_inode(ip);
|
|
if (ip->i_inode.i_mapping->nrpages == 0)
|
|
continue;
|
|
spin_unlock(&sdp->sd_ordered_lock);
|
|
filemap_fdatawait(ip->i_inode.i_mapping);
|
|
spin_lock(&sdp->sd_ordered_lock);
|
|
}
|
|
spin_unlock(&sdp->sd_ordered_lock);
|
|
}
|
|
|
|
void gfs2_ordered_del_inode(struct gfs2_inode *ip)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
|
|
spin_lock(&sdp->sd_ordered_lock);
|
|
__ordered_del_inode(ip);
|
|
spin_unlock(&sdp->sd_ordered_lock);
|
|
}
|
|
|
|
void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
|
|
{
|
|
struct buffer_head *bh = bd->bd_bh;
|
|
struct gfs2_glock *gl = bd->bd_gl;
|
|
|
|
sdp->sd_log_num_revoke++;
|
|
if (atomic_inc_return(&gl->gl_revokes) == 1)
|
|
gfs2_glock_hold(gl);
|
|
bh->b_private = NULL;
|
|
bd->bd_blkno = bh->b_blocknr;
|
|
gfs2_remove_from_ail(bd); /* drops ref on bh */
|
|
bd->bd_bh = NULL;
|
|
set_bit(GLF_LFLUSH, &gl->gl_flags);
|
|
list_add(&bd->bd_list, &sdp->sd_log_revokes);
|
|
}
|
|
|
|
void gfs2_glock_remove_revoke(struct gfs2_glock *gl)
|
|
{
|
|
if (atomic_dec_return(&gl->gl_revokes) == 0) {
|
|
clear_bit(GLF_LFLUSH, &gl->gl_flags);
|
|
gfs2_glock_queue_put(gl);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_flush_revokes - Add as many revokes to the system transaction as we can
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* Our usual strategy is to defer writing revokes as much as we can in the hope
|
|
* that we'll eventually overwrite the journal, which will make those revokes
|
|
* go away. This changes when we flush the log: at that point, there will
|
|
* likely be some left-over space in the last revoke block of that transaction.
|
|
* We can fill that space with additional revokes for blocks that have already
|
|
* been written back. This will basically come at no cost now, and will save
|
|
* us from having to keep track of those blocks on the AIL2 list later.
|
|
*/
|
|
void gfs2_flush_revokes(struct gfs2_sbd *sdp)
|
|
{
|
|
/* number of revokes we still have room for */
|
|
unsigned int max_revokes = atomic_read(&sdp->sd_log_revokes_available);
|
|
|
|
gfs2_log_lock(sdp);
|
|
gfs2_ail1_empty(sdp, max_revokes);
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_write_log_header - Write a journal log header buffer at lblock
|
|
* @sdp: The GFS2 superblock
|
|
* @jd: journal descriptor of the journal to which we are writing
|
|
* @seq: sequence number
|
|
* @tail: tail of the log
|
|
* @lblock: value for lh_blkno (block number relative to start of journal)
|
|
* @flags: log header flags GFS2_LOG_HEAD_*
|
|
* @op_flags: flags to pass to the bio
|
|
*
|
|
* Returns: the initialized log buffer descriptor
|
|
*/
|
|
|
|
void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
|
|
u64 seq, u32 tail, u32 lblock, u32 flags,
|
|
blk_opf_t op_flags)
|
|
{
|
|
struct gfs2_log_header *lh;
|
|
u32 hash, crc;
|
|
struct page *page;
|
|
struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
|
|
struct timespec64 tv;
|
|
struct super_block *sb = sdp->sd_vfs;
|
|
u64 dblock;
|
|
|
|
if (gfs2_withdrawn(sdp))
|
|
return;
|
|
|
|
page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
|
|
lh = page_address(page);
|
|
clear_page(lh);
|
|
|
|
lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
|
|
lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
|
|
lh->lh_header.__pad0 = cpu_to_be64(0);
|
|
lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
|
|
lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
|
|
lh->lh_sequence = cpu_to_be64(seq);
|
|
lh->lh_flags = cpu_to_be32(flags);
|
|
lh->lh_tail = cpu_to_be32(tail);
|
|
lh->lh_blkno = cpu_to_be32(lblock);
|
|
hash = ~crc32(~0, lh, LH_V1_SIZE);
|
|
lh->lh_hash = cpu_to_be32(hash);
|
|
|
|
ktime_get_coarse_real_ts64(&tv);
|
|
lh->lh_nsec = cpu_to_be32(tv.tv_nsec);
|
|
lh->lh_sec = cpu_to_be64(tv.tv_sec);
|
|
if (!list_empty(&jd->extent_list))
|
|
dblock = gfs2_log_bmap(jd, lblock);
|
|
else {
|
|
unsigned int extlen;
|
|
int ret;
|
|
|
|
extlen = 1;
|
|
ret = gfs2_get_extent(jd->jd_inode, lblock, &dblock, &extlen);
|
|
if (gfs2_assert_withdraw(sdp, ret == 0))
|
|
return;
|
|
}
|
|
lh->lh_addr = cpu_to_be64(dblock);
|
|
lh->lh_jinode = cpu_to_be64(GFS2_I(jd->jd_inode)->i_no_addr);
|
|
|
|
/* We may only write local statfs, quota, etc., when writing to our
|
|
own journal. The values are left 0 when recovering a journal
|
|
different from our own. */
|
|
if (!(flags & GFS2_LOG_HEAD_RECOVERY)) {
|
|
lh->lh_statfs_addr =
|
|
cpu_to_be64(GFS2_I(sdp->sd_sc_inode)->i_no_addr);
|
|
lh->lh_quota_addr =
|
|
cpu_to_be64(GFS2_I(sdp->sd_qc_inode)->i_no_addr);
|
|
|
|
spin_lock(&sdp->sd_statfs_spin);
|
|
lh->lh_local_total = cpu_to_be64(l_sc->sc_total);
|
|
lh->lh_local_free = cpu_to_be64(l_sc->sc_free);
|
|
lh->lh_local_dinodes = cpu_to_be64(l_sc->sc_dinodes);
|
|
spin_unlock(&sdp->sd_statfs_spin);
|
|
}
|
|
|
|
BUILD_BUG_ON(offsetof(struct gfs2_log_header, lh_crc) != LH_V1_SIZE);
|
|
|
|
crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
|
|
sb->s_blocksize - LH_V1_SIZE - 4);
|
|
lh->lh_crc = cpu_to_be32(crc);
|
|
|
|
gfs2_log_write(sdp, jd, page, sb->s_blocksize, 0, dblock);
|
|
gfs2_log_submit_bio(&jd->jd_log_bio, REQ_OP_WRITE | op_flags);
|
|
}
|
|
|
|
/**
|
|
* log_write_header - Get and initialize a journal header buffer
|
|
* @sdp: The GFS2 superblock
|
|
* @flags: The log header flags, including log header origin
|
|
*
|
|
* Returns: the initialized log buffer descriptor
|
|
*/
|
|
|
|
static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
|
|
{
|
|
blk_opf_t op_flags = REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC;
|
|
enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
|
|
|
|
gfs2_assert_withdraw(sdp, (state != SFS_FROZEN));
|
|
|
|
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
|
|
gfs2_ordered_wait(sdp);
|
|
log_flush_wait(sdp);
|
|
op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
|
|
}
|
|
sdp->sd_log_idle = (sdp->sd_log_flush_tail == sdp->sd_log_flush_head);
|
|
gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++,
|
|
sdp->sd_log_flush_tail, sdp->sd_log_flush_head,
|
|
flags, op_flags);
|
|
gfs2_log_incr_head(sdp);
|
|
log_flush_wait(sdp);
|
|
log_pull_tail(sdp);
|
|
gfs2_log_update_head(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_ail_drain - drain the ail lists after a withdraw
|
|
* @sdp: Pointer to GFS2 superblock
|
|
*/
|
|
void gfs2_ail_drain(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_trans *tr;
|
|
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
/*
|
|
* For transactions on the sd_ail1_list we need to drain both the
|
|
* ail1 and ail2 lists. That's because function gfs2_ail1_start_one
|
|
* (temporarily) moves items from its tr_ail1 list to tr_ail2 list
|
|
* before revokes are sent for that block. Items on the sd_ail2_list
|
|
* should have already gotten beyond that point, so no need.
|
|
*/
|
|
while (!list_empty(&sdp->sd_ail1_list)) {
|
|
tr = list_first_entry(&sdp->sd_ail1_list, struct gfs2_trans,
|
|
tr_list);
|
|
gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail1_list);
|
|
gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list);
|
|
list_del(&tr->tr_list);
|
|
gfs2_trans_free(sdp, tr);
|
|
}
|
|
while (!list_empty(&sdp->sd_ail2_list)) {
|
|
tr = list_first_entry(&sdp->sd_ail2_list, struct gfs2_trans,
|
|
tr_list);
|
|
gfs2_ail_empty_tr(sdp, tr, &tr->tr_ail2_list);
|
|
list_del(&tr->tr_list);
|
|
gfs2_trans_free(sdp, tr);
|
|
}
|
|
gfs2_drain_revokes(sdp);
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
}
|
|
|
|
/**
|
|
* empty_ail1_list - try to start IO and empty the ail1 list
|
|
* @sdp: Pointer to GFS2 superblock
|
|
*/
|
|
static void empty_ail1_list(struct gfs2_sbd *sdp)
|
|
{
|
|
unsigned long start = jiffies;
|
|
|
|
for (;;) {
|
|
if (time_after(jiffies, start + (HZ * 600))) {
|
|
fs_err(sdp, "Error: In %s for 10 minutes! t=%d\n",
|
|
__func__, current->journal_info ? 1 : 0);
|
|
dump_ail_list(sdp);
|
|
return;
|
|
}
|
|
gfs2_ail1_start(sdp);
|
|
gfs2_ail1_wait(sdp);
|
|
if (gfs2_ail1_empty(sdp, 0))
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* trans_drain - drain the buf and databuf queue for a failed transaction
|
|
* @tr: the transaction to drain
|
|
*
|
|
* When this is called, we're taking an error exit for a log write that failed
|
|
* but since we bypassed the after_commit functions, we need to remove the
|
|
* items from the buf and databuf queue.
|
|
*/
|
|
static void trans_drain(struct gfs2_trans *tr)
|
|
{
|
|
struct gfs2_bufdata *bd;
|
|
struct list_head *head;
|
|
|
|
if (!tr)
|
|
return;
|
|
|
|
head = &tr->tr_buf;
|
|
while (!list_empty(head)) {
|
|
bd = list_first_entry(head, struct gfs2_bufdata, bd_list);
|
|
list_del_init(&bd->bd_list);
|
|
if (!list_empty(&bd->bd_ail_st_list))
|
|
gfs2_remove_from_ail(bd);
|
|
kmem_cache_free(gfs2_bufdata_cachep, bd);
|
|
}
|
|
head = &tr->tr_databuf;
|
|
while (!list_empty(head)) {
|
|
bd = list_first_entry(head, struct gfs2_bufdata, bd_list);
|
|
list_del_init(&bd->bd_list);
|
|
if (!list_empty(&bd->bd_ail_st_list))
|
|
gfs2_remove_from_ail(bd);
|
|
kmem_cache_free(gfs2_bufdata_cachep, bd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_flush - flush incore transaction(s)
|
|
* @sdp: The filesystem
|
|
* @gl: The glock structure to flush. If NULL, flush the whole incore log
|
|
* @flags: The log header flags: GFS2_LOG_HEAD_FLUSH_* and debug flags
|
|
*
|
|
*/
|
|
|
|
void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags)
|
|
{
|
|
struct gfs2_trans *tr = NULL;
|
|
unsigned int reserved_blocks = 0, used_blocks = 0;
|
|
enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
|
|
unsigned int first_log_head;
|
|
unsigned int reserved_revokes = 0;
|
|
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
trace_gfs2_log_flush(sdp, 1, flags);
|
|
|
|
repeat:
|
|
/*
|
|
* Do this check while holding the log_flush_lock to prevent new
|
|
* buffers from being added to the ail via gfs2_pin()
|
|
*/
|
|
if (gfs2_withdrawn(sdp) || !test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
|
|
goto out;
|
|
|
|
/* Log might have been flushed while we waited for the flush lock */
|
|
if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags))
|
|
goto out;
|
|
|
|
first_log_head = sdp->sd_log_head;
|
|
sdp->sd_log_flush_head = first_log_head;
|
|
|
|
tr = sdp->sd_log_tr;
|
|
if (tr || sdp->sd_log_num_revoke) {
|
|
if (reserved_blocks)
|
|
gfs2_log_release(sdp, reserved_blocks);
|
|
reserved_blocks = sdp->sd_log_blks_reserved;
|
|
reserved_revokes = sdp->sd_log_num_revoke;
|
|
if (tr) {
|
|
sdp->sd_log_tr = NULL;
|
|
tr->tr_first = first_log_head;
|
|
if (unlikely (state == SFS_FROZEN)) {
|
|
if (gfs2_assert_withdraw_delayed(sdp,
|
|
!tr->tr_num_buf_new && !tr->tr_num_databuf_new))
|
|
goto out_withdraw;
|
|
}
|
|
}
|
|
} else if (!reserved_blocks) {
|
|
unsigned int taboo_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS;
|
|
|
|
reserved_blocks = GFS2_LOG_FLUSH_MIN_BLOCKS;
|
|
if (current == sdp->sd_logd_process)
|
|
taboo_blocks = 0;
|
|
|
|
if (!__gfs2_log_try_reserve(sdp, reserved_blocks, taboo_blocks)) {
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
__gfs2_log_reserve(sdp, reserved_blocks, taboo_blocks);
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
goto repeat;
|
|
}
|
|
BUG_ON(sdp->sd_log_num_revoke);
|
|
}
|
|
|
|
if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
|
|
clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
|
|
|
|
if (unlikely(state == SFS_FROZEN))
|
|
if (gfs2_assert_withdraw_delayed(sdp, !reserved_revokes))
|
|
goto out_withdraw;
|
|
|
|
gfs2_ordered_write(sdp);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out_withdraw;
|
|
lops_before_commit(sdp, tr);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out_withdraw;
|
|
gfs2_log_submit_bio(&sdp->sd_jdesc->jd_log_bio, REQ_OP_WRITE);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out_withdraw;
|
|
|
|
if (sdp->sd_log_head != sdp->sd_log_flush_head) {
|
|
log_write_header(sdp, flags);
|
|
} else if (sdp->sd_log_tail != sdp->sd_log_flush_tail && !sdp->sd_log_idle) {
|
|
log_write_header(sdp, flags);
|
|
}
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out_withdraw;
|
|
lops_after_commit(sdp, tr);
|
|
|
|
gfs2_log_lock(sdp);
|
|
sdp->sd_log_blks_reserved = 0;
|
|
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
if (tr && !list_empty(&tr->tr_ail1_list)) {
|
|
list_add(&tr->tr_list, &sdp->sd_ail1_list);
|
|
tr = NULL;
|
|
}
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
gfs2_log_unlock(sdp);
|
|
|
|
if (!(flags & GFS2_LOG_HEAD_FLUSH_NORMAL)) {
|
|
if (!sdp->sd_log_idle) {
|
|
empty_ail1_list(sdp);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out_withdraw;
|
|
log_write_header(sdp, flags);
|
|
}
|
|
if (flags & (GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
|
|
GFS2_LOG_HEAD_FLUSH_FREEZE))
|
|
gfs2_log_shutdown(sdp);
|
|
if (flags & GFS2_LOG_HEAD_FLUSH_FREEZE)
|
|
atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
|
|
}
|
|
|
|
out_end:
|
|
used_blocks = log_distance(sdp, sdp->sd_log_flush_head, first_log_head);
|
|
reserved_revokes += atomic_read(&sdp->sd_log_revokes_available);
|
|
atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
|
|
gfs2_assert_withdraw(sdp, reserved_revokes % sdp->sd_inptrs == sdp->sd_ldptrs);
|
|
if (reserved_revokes > sdp->sd_ldptrs)
|
|
reserved_blocks += (reserved_revokes - sdp->sd_ldptrs) / sdp->sd_inptrs;
|
|
out:
|
|
if (used_blocks != reserved_blocks) {
|
|
gfs2_assert_withdraw_delayed(sdp, used_blocks < reserved_blocks);
|
|
gfs2_log_release(sdp, reserved_blocks - used_blocks);
|
|
}
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
gfs2_trans_free(sdp, tr);
|
|
if (gfs2_withdrawing(sdp))
|
|
gfs2_withdraw(sdp);
|
|
trace_gfs2_log_flush(sdp, 0, flags);
|
|
return;
|
|
|
|
out_withdraw:
|
|
trans_drain(tr);
|
|
/**
|
|
* If the tr_list is empty, we're withdrawing during a log
|
|
* flush that targets a transaction, but the transaction was
|
|
* never queued onto any of the ail lists. Here we add it to
|
|
* ail1 just so that ail_drain() will find and free it.
|
|
*/
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
if (tr && list_empty(&tr->tr_list))
|
|
list_add(&tr->tr_list, &sdp->sd_ail1_list);
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
tr = NULL;
|
|
goto out_end;
|
|
}
|
|
|
|
/**
|
|
* gfs2_merge_trans - Merge a new transaction into a cached transaction
|
|
* @sdp: the filesystem
|
|
* @new: New transaction to be merged
|
|
*/
|
|
|
|
static void gfs2_merge_trans(struct gfs2_sbd *sdp, struct gfs2_trans *new)
|
|
{
|
|
struct gfs2_trans *old = sdp->sd_log_tr;
|
|
|
|
WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags));
|
|
|
|
old->tr_num_buf_new += new->tr_num_buf_new;
|
|
old->tr_num_databuf_new += new->tr_num_databuf_new;
|
|
old->tr_num_buf_rm += new->tr_num_buf_rm;
|
|
old->tr_num_databuf_rm += new->tr_num_databuf_rm;
|
|
old->tr_revokes += new->tr_revokes;
|
|
old->tr_num_revoke += new->tr_num_revoke;
|
|
|
|
list_splice_tail_init(&new->tr_databuf, &old->tr_databuf);
|
|
list_splice_tail_init(&new->tr_buf, &old->tr_buf);
|
|
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
list_splice_tail_init(&new->tr_ail1_list, &old->tr_ail1_list);
|
|
list_splice_tail_init(&new->tr_ail2_list, &old->tr_ail2_list);
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
}
|
|
|
|
static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
unsigned int reserved;
|
|
unsigned int unused;
|
|
unsigned int maxres;
|
|
|
|
gfs2_log_lock(sdp);
|
|
|
|
if (sdp->sd_log_tr) {
|
|
gfs2_merge_trans(sdp, tr);
|
|
} else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {
|
|
gfs2_assert_withdraw(sdp, !test_bit(TR_ONSTACK, &tr->tr_flags));
|
|
sdp->sd_log_tr = tr;
|
|
set_bit(TR_ATTACHED, &tr->tr_flags);
|
|
}
|
|
|
|
reserved = calc_reserved(sdp);
|
|
maxres = sdp->sd_log_blks_reserved + tr->tr_reserved;
|
|
gfs2_assert_withdraw(sdp, maxres >= reserved);
|
|
unused = maxres - reserved;
|
|
if (unused)
|
|
gfs2_log_release(sdp, unused);
|
|
sdp->sd_log_blks_reserved = reserved;
|
|
|
|
gfs2_log_unlock(sdp);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_commit - Commit a transaction to the log
|
|
* @sdp: the filesystem
|
|
* @tr: the transaction
|
|
*
|
|
* We wake up gfs2_logd if the number of pinned blocks exceed thresh1
|
|
* or the total number of used blocks (pinned blocks plus AIL blocks)
|
|
* is greater than thresh2.
|
|
*
|
|
* At mount time thresh1 is 2/5ths of journal size, thresh2 is 4/5ths of
|
|
* journal size.
|
|
*
|
|
* Returns: errno
|
|
*/
|
|
|
|
void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
|
|
{
|
|
log_refund(sdp, tr);
|
|
|
|
if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
|
|
((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
|
|
atomic_read(&sdp->sd_log_thresh2)))
|
|
wake_up(&sdp->sd_logd_waitq);
|
|
}
|
|
|
|
/**
|
|
* gfs2_log_shutdown - write a shutdown header into a journal
|
|
* @sdp: the filesystem
|
|
*
|
|
*/
|
|
|
|
static void gfs2_log_shutdown(struct gfs2_sbd *sdp)
|
|
{
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
|
|
gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
|
|
gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
|
|
|
|
log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN);
|
|
log_pull_tail(sdp);
|
|
|
|
gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
|
|
gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
|
|
}
|
|
|
|
static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
|
|
{
|
|
return (atomic_read(&sdp->sd_log_pinned) +
|
|
atomic_read(&sdp->sd_log_blks_needed) >=
|
|
atomic_read(&sdp->sd_log_thresh1));
|
|
}
|
|
|
|
static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
|
|
{
|
|
unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
|
|
|
|
if (test_and_clear_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags))
|
|
return 1;
|
|
|
|
return used_blocks + atomic_read(&sdp->sd_log_blks_needed) >=
|
|
atomic_read(&sdp->sd_log_thresh2);
|
|
}
|
|
|
|
/**
|
|
* gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
|
|
* @data: Pointer to GFS2 superblock
|
|
*
|
|
* Also, periodically check to make sure that we're using the most recent
|
|
* journal index.
|
|
*/
|
|
|
|
int gfs2_logd(void *data)
|
|
{
|
|
struct gfs2_sbd *sdp = data;
|
|
unsigned long t = 1;
|
|
DEFINE_WAIT(wait);
|
|
|
|
while (!kthread_should_stop()) {
|
|
|
|
if (gfs2_withdrawn(sdp)) {
|
|
msleep_interruptible(HZ);
|
|
continue;
|
|
}
|
|
/* Check for errors writing to the journal */
|
|
if (sdp->sd_log_error) {
|
|
gfs2_lm(sdp,
|
|
"GFS2: fsid=%s: error %d: "
|
|
"withdrawing the file system to "
|
|
"prevent further damage.\n",
|
|
sdp->sd_fsname, sdp->sd_log_error);
|
|
gfs2_withdraw(sdp);
|
|
continue;
|
|
}
|
|
|
|
if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
|
|
gfs2_ail1_empty(sdp, 0);
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
|
|
GFS2_LFC_LOGD_JFLUSH_REQD);
|
|
}
|
|
|
|
if (gfs2_ail_flush_reqd(sdp)) {
|
|
gfs2_ail1_start(sdp);
|
|
gfs2_ail1_wait(sdp);
|
|
gfs2_ail1_empty(sdp, 0);
|
|
gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
|
|
GFS2_LFC_LOGD_AIL_FLUSH_REQD);
|
|
}
|
|
|
|
t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
|
|
|
|
try_to_freeze();
|
|
|
|
do {
|
|
prepare_to_wait(&sdp->sd_logd_waitq, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
if (!gfs2_ail_flush_reqd(sdp) &&
|
|
!gfs2_jrnl_flush_reqd(sdp) &&
|
|
!kthread_should_stop())
|
|
t = schedule_timeout(t);
|
|
} while(t && !gfs2_ail_flush_reqd(sdp) &&
|
|
!gfs2_jrnl_flush_reqd(sdp) &&
|
|
!kthread_should_stop());
|
|
finish_wait(&sdp->sd_logd_waitq, &wait);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|