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83d060ca8d
Before this patch, transactions could be merged into the system transaction by function gfs2_merge_trans(), but the transaction ail lists were never merged. Because the ail flushing mechanism can run separately, bd elements can be attached to the transaction's buffer list during the transaction (trans_add_meta, etc) but quickly moved to its ail lists. Later, in function gfs2_trans_end, the transaction can be freed (by gfs2_trans_end) while it still has bd elements queued to its ail lists, which can cause it to either lose track of the bd elements altogether (memory leak) or worse, reference the bd elements after the parent transaction has been freed. Although I've not seen any serious consequences, the problem becomes apparent with the previous patch's addition of: gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list)); to function gfs2_trans_free(). This patch adds logic into gfs2_merge_trans() to move the merged transaction's ail lists to the sdp transaction. This prevents the use-after-free. To do this properly, we need to hold the ail lock, so we pass sdp into the function instead of the transaction itself. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
1210 lines
33 KiB
C
1210 lines
33 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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blks = 1;
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first = sdp->sd_ldptrs;
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if (nstruct > first) {
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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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* @mapping: The associated mapping (maybe NULL)
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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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static 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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/**
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* gfs2_ail1_start_one - Start I/O on a part of the AIL
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* @sdp: the filesystem
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* @wbc: The writeback control structure
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* @ai: The ail structure
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*
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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)
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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 = generic_writepages(mapping, wbc);
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spin_lock(&sdp->sd_ail_lock);
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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);
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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 (generic_writepages) "
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"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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/**
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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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*/
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static void 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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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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continue;
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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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}
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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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gfs2_ail1_empty_one(sdp, tr, &max_revokes);
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if (list_empty(&tr->tr_ail1_list) && 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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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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/**
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* gfs2_ail_empty_tr - empty one of the ail lists for 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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static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
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{
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struct gfs2_trans *tr, *safe;
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unsigned int old_tail = sdp->sd_log_tail;
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int wrap = (new_tail < old_tail);
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int a, b, rm;
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spin_lock(&sdp->sd_ail_lock);
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list_for_each_entry_safe(tr, safe, &sdp->sd_ail2_list, tr_list) {
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a = (old_tail <= tr->tr_first);
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b = (tr->tr_first < new_tail);
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rm = (wrap) ? (a || b) : (a && b);
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if (!rm)
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continue;
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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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spin_unlock(&sdp->sd_ail_lock);
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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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up_read(&sdp->sd_log_flush_lock);
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}
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/**
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* gfs2_log_reserve - Make a log reservation
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* @sdp: The GFS2 superblock
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* @blks: The number of blocks to reserve
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*
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* Note that we never give out the last few blocks of the journal. Thats
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* due to the fact that there is a small number of header blocks
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* associated with each log flush. The exact number can't be known until
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* flush time, so we ensure that we have just enough free blocks at all
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* times to avoid running out during a log flush.
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*
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* We no longer flush the log here, instead we wake up logd to do that
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* for us. To avoid the thundering herd and to ensure that we deal fairly
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* with queued waiters, we use an exclusive wait. This means that when we
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* get woken with enough journal space to get our reservation, we need to
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* wake the next waiter on the list.
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*
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* Returns: errno
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*/
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int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
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{
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int ret = 0;
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unsigned reserved_blks = 7 * (4096 / sdp->sd_vfs->s_blocksize);
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unsigned wanted = blks + reserved_blks;
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DEFINE_WAIT(wait);
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int did_wait = 0;
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unsigned int free_blocks;
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if (gfs2_assert_warn(sdp, blks) ||
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gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
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return -EINVAL;
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atomic_add(blks, &sdp->sd_log_blks_needed);
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retry:
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free_blocks = atomic_read(&sdp->sd_log_blks_free);
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if (unlikely(free_blocks <= wanted)) {
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do {
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prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
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TASK_UNINTERRUPTIBLE);
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wake_up(&sdp->sd_logd_waitq);
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did_wait = 1;
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if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
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io_schedule();
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free_blocks = atomic_read(&sdp->sd_log_blks_free);
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} while(free_blocks <= wanted);
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finish_wait(&sdp->sd_log_waitq, &wait);
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}
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atomic_inc(&sdp->sd_reserving_log);
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if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
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free_blocks - blks) != free_blocks) {
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if (atomic_dec_and_test(&sdp->sd_reserving_log))
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wake_up(&sdp->sd_reserving_log_wait);
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goto retry;
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}
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atomic_sub(blks, &sdp->sd_log_blks_needed);
|
|
trace_gfs2_log_blocks(sdp, -blks);
|
|
|
|
/*
|
|
* If we waited, then so might others, wake them up _after_ we get
|
|
* our share of the log.
|
|
*/
|
|
if (unlikely(did_wait))
|
|
wake_up(&sdp->sd_log_waitq);
|
|
|
|
down_read(&sdp->sd_log_flush_lock);
|
|
if (unlikely(!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))) {
|
|
gfs2_log_release(sdp, blks);
|
|
ret = -EROFS;
|
|
}
|
|
if (atomic_dec_and_test(&sdp->sd_reserving_log))
|
|
wake_up(&sdp->sd_reserving_log_wait);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 reserve when
|
|
* refunding a transaction's unused buffers.
|
|
* @sdp: The GFS2 superblock
|
|
*
|
|
* This is complex. We need to reserve room for all our currently used
|
|
* metadata buffers (e.g. normal file I/O rewriting file time stamps) and
|
|
* all our journaled data buffers 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, gfs2_log_refund and gfs2_log_flush
|
|
* will count it as free space (sd_log_blks_free) and corruption will follow.
|
|
*
|
|
* We can have metadata bufs and jdata bufs in the same journal. So each
|
|
* type gets its own log header, for which we need to reserve a block.
|
|
* In fact, each type has the potential for needing more than one header
|
|
* in cases where we have more buffers than will fit on a journal page.
|
|
* Metadata journal entries take up half the space of journaled buffer entries.
|
|
* Thus, metadata entries have buf_limit (502) and journaled buffers have
|
|
* databuf_limit (251) before they cause a wrap around.
|
|
*
|
|
* 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 = 0;
|
|
unsigned int mbuf;
|
|
unsigned int dbuf;
|
|
struct gfs2_trans *tr = sdp->sd_log_tr;
|
|
|
|
if (tr) {
|
|
mbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
|
|
dbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
|
|
reserved = mbuf + dbuf;
|
|
/* Account for header blocks */
|
|
reserved += DIV_ROUND_UP(mbuf, buf_limit(sdp));
|
|
reserved += DIV_ROUND_UP(dbuf, databuf_limit(sdp));
|
|
}
|
|
|
|
if (sdp->sd_log_committed_revoke > 0)
|
|
reserved += gfs2_struct2blk(sdp, sdp->sd_log_committed_revoke);
|
|
/* One for the overall header */
|
|
if (reserved)
|
|
reserved++;
|
|
return reserved;
|
|
}
|
|
|
|
static unsigned int current_tail(struct gfs2_sbd *sdp)
|
|
{
|
|
struct gfs2_trans *tr;
|
|
unsigned int tail;
|
|
|
|
spin_lock(&sdp->sd_ail_lock);
|
|
|
|
if (list_empty(&sdp->sd_ail1_list)) {
|
|
tail = sdp->sd_log_head;
|
|
} else {
|
|
tr = list_last_entry(&sdp->sd_ail1_list, struct gfs2_trans,
|
|
tr_list);
|
|
tail = tr->tr_first;
|
|
}
|
|
|
|
spin_unlock(&sdp->sd_ail_lock);
|
|
|
|
return tail;
|
|
}
|
|
|
|
static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
|
|
{
|
|
unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
|
|
|
|
ail2_empty(sdp, new_tail);
|
|
|
|
atomic_add(dist, &sdp->sd_log_blks_free);
|
|
trace_gfs2_log_blocks(sdp, dist);
|
|
gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
|
|
sdp->sd_jdesc->jd_blocks);
|
|
|
|
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, struct list_head *a, 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 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) {
|
|
test_and_clear_bit(GIF_ORDERED, &ip->i_flags);
|
|
list_del(&ip->i_ordered);
|
|
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);
|
|
list_del(&ip->i_ordered);
|
|
WARN_ON(!test_and_clear_bit(GIF_ORDERED, &ip->i_flags));
|
|
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);
|
|
if (test_and_clear_bit(GIF_ORDERED, &ip->i_flags))
|
|
list_del(&ip->i_ordered);
|
|
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_write_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_write_revokes(struct gfs2_sbd *sdp)
|
|
{
|
|
/* number of revokes we still have room for */
|
|
int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
|
|
|
|
gfs2_log_lock(sdp);
|
|
while (sdp->sd_log_num_revoke > max_revokes)
|
|
max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
|
|
max_revokes -= sdp->sd_log_num_revoke;
|
|
if (!sdp->sd_log_num_revoke) {
|
|
atomic_dec(&sdp->sd_log_blks_free);
|
|
/* If no blocks have been reserved, we need to also
|
|
* reserve a block for the header */
|
|
if (!sdp->sd_log_blks_reserved)
|
|
atomic_dec(&sdp->sd_log_blks_free);
|
|
}
|
|
gfs2_ail1_empty(sdp, max_revokes);
|
|
gfs2_log_unlock(sdp);
|
|
|
|
if (!sdp->sd_log_num_revoke) {
|
|
atomic_inc(&sdp->sd_log_blks_free);
|
|
if (!sdp->sd_log_blks_reserved)
|
|
atomic_inc(&sdp->sd_log_blks_free);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
int 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))
|
|
goto out;
|
|
|
|
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 {
|
|
int ret = gfs2_lblk_to_dblk(jd->jd_inode, lblock, &dblock);
|
|
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, page, sb->s_blocksize, 0, dblock);
|
|
gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE | op_flags);
|
|
out:
|
|
log_flush_wait(sdp);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
unsigned int tail;
|
|
int 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));
|
|
tail = current_tail(sdp);
|
|
|
|
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 = (tail == sdp->sd_log_flush_head);
|
|
gfs2_write_log_header(sdp, sdp->sd_jdesc, sdp->sd_log_sequence++, tail,
|
|
sdp->sd_log_flush_head, flags, op_flags);
|
|
gfs2_log_incr_head(sdp);
|
|
|
|
if (sdp->sd_log_tail != tail)
|
|
log_pull_tail(sdp, tail);
|
|
}
|
|
|
|
/**
|
|
* ail_drain - drain the ail lists after a withdraw
|
|
* @sdp: Pointer to GFS2 superblock
|
|
*/
|
|
static void 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);
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
|
|
|
|
down_write(&sdp->sd_log_flush_lock);
|
|
|
|
/*
|
|
* 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))
|
|
goto out;
|
|
|
|
/* Log might have been flushed while we waited for the flush lock */
|
|
if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
return;
|
|
}
|
|
trace_gfs2_log_flush(sdp, 1, flags);
|
|
|
|
if (flags & GFS2_LOG_HEAD_FLUSH_SHUTDOWN)
|
|
clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
|
|
|
|
sdp->sd_log_flush_head = sdp->sd_log_head;
|
|
tr = sdp->sd_log_tr;
|
|
if (tr) {
|
|
sdp->sd_log_tr = NULL;
|
|
tr->tr_first = sdp->sd_log_flush_head;
|
|
if (unlikely (state == SFS_FROZEN))
|
|
if (gfs2_assert_withdraw_delayed(sdp,
|
|
!tr->tr_num_buf_new && !tr->tr_num_databuf_new))
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely(state == SFS_FROZEN))
|
|
if (gfs2_assert_withdraw_delayed(sdp, !sdp->sd_log_num_revoke))
|
|
goto out;
|
|
if (gfs2_assert_withdraw_delayed(sdp,
|
|
sdp->sd_log_num_revoke == sdp->sd_log_committed_revoke))
|
|
goto out;
|
|
|
|
gfs2_ordered_write(sdp);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out;
|
|
lops_before_commit(sdp, tr);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out;
|
|
gfs2_log_submit_bio(&sdp->sd_log_bio, REQ_OP_WRITE);
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out;
|
|
|
|
if (sdp->sd_log_head != sdp->sd_log_flush_head) {
|
|
log_flush_wait(sdp);
|
|
log_write_header(sdp, flags);
|
|
} else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
|
|
atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
|
|
trace_gfs2_log_blocks(sdp, -1);
|
|
log_write_header(sdp, flags);
|
|
}
|
|
if (gfs2_withdrawn(sdp))
|
|
goto out;
|
|
lops_after_commit(sdp, tr);
|
|
|
|
gfs2_log_lock(sdp);
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
sdp->sd_log_blks_reserved = 0;
|
|
sdp->sd_log_committed_revoke = 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;
|
|
atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
|
|
trace_gfs2_log_blocks(sdp, -1);
|
|
log_write_header(sdp, flags);
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
}
|
|
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:
|
|
if (gfs2_withdrawn(sdp)) {
|
|
ail_drain(sdp); /* frees all transactions */
|
|
tr = NULL;
|
|
}
|
|
|
|
trace_gfs2_log_flush(sdp, 0, flags);
|
|
up_write(&sdp->sd_log_flush_lock);
|
|
|
|
gfs2_trans_free(sdp, tr);
|
|
}
|
|
|
|
/**
|
|
* gfs2_merge_trans - Merge a new transaction into a cached transaction
|
|
* @old: Original transaction to be expanded
|
|
* @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_num_revoke += new->tr_num_revoke;
|
|
old->tr_num_revoke_rm += new->tr_num_revoke_rm;
|
|
|
|
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_ALLOCED, &tr->tr_flags));
|
|
sdp->sd_log_tr = tr;
|
|
set_bit(TR_ATTACHED, &tr->tr_flags);
|
|
}
|
|
|
|
sdp->sd_log_committed_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
|
|
reserved = calc_reserved(sdp);
|
|
maxres = sdp->sd_log_blks_reserved + tr->tr_reserved;
|
|
gfs2_assert_withdraw(sdp, maxres >= reserved);
|
|
unused = maxres - reserved;
|
|
atomic_add(unused, &sdp->sd_log_blks_free);
|
|
trace_gfs2_log_blocks(sdp, unused);
|
|
gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
|
|
sdp->sd_jdesc->jd_blocks);
|
|
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 1/3rd of journal size, thresh2 is 2/3rd 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));
|
|
|
|
sdp->sd_log_flush_head = sdp->sd_log_head;
|
|
|
|
log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT | GFS2_LFC_SHUTDOWN);
|
|
|
|
gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
|
|
gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
|
|
|
|
sdp->sd_log_head = sdp->sd_log_flush_head;
|
|
sdp->sd_log_tail = sdp->sd_log_head;
|
|
}
|
|
|
|
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
|
|
* @sdp: 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);
|
|
bool did_flush;
|
|
|
|
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;
|
|
}
|
|
|
|
did_flush = false;
|
|
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);
|
|
did_flush = true;
|
|
}
|
|
|
|
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);
|
|
did_flush = true;
|
|
}
|
|
|
|
if (!gfs2_ail_flush_reqd(sdp) || did_flush)
|
|
wake_up(&sdp->sd_log_waitq);
|
|
|
|
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;
|
|
}
|
|
|