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![Bob Peterson](/assets/img/avatar_default.png)
For its journal processing, gfs2 kept track of the number of buffers added and removed on a per-transaction basis. These values are used to calculate space needed in the journal. But while these calculations make sense for the number of buffers, they make no sense for revokes. Revokes are managed in their own list, linked from the superblock. So it's entirely unnecessary to keep separate per-transaction counts for revokes added and removed. A single count will do the same job. Therefore, this patch combines the transaction revokes into a single count. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
273 lines
6.9 KiB
C
273 lines
6.9 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) 2004-2006 Red Hat, Inc. All rights reserved.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/kallsyms.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "glock.h"
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#include "inode.h"
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#include "log.h"
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#include "lops.h"
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#include "meta_io.h"
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#include "trans.h"
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#include "util.h"
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#include "trace_gfs2.h"
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int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
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unsigned int revokes)
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{
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struct gfs2_trans *tr;
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int error;
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BUG_ON(current->journal_info);
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BUG_ON(blocks == 0 && revokes == 0);
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if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
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return -EROFS;
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tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
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if (!tr)
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return -ENOMEM;
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tr->tr_ip = _RET_IP_;
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tr->tr_blocks = blocks;
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tr->tr_revokes = revokes;
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tr->tr_reserved = 1;
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set_bit(TR_ALLOCED, &tr->tr_flags);
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if (blocks)
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tr->tr_reserved += 6 + blocks;
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if (revokes)
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tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
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sizeof(u64));
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INIT_LIST_HEAD(&tr->tr_databuf);
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INIT_LIST_HEAD(&tr->tr_buf);
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sb_start_intwrite(sdp->sd_vfs);
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error = gfs2_log_reserve(sdp, tr->tr_reserved);
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if (error)
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goto fail;
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current->journal_info = tr;
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return 0;
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fail:
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sb_end_intwrite(sdp->sd_vfs);
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kfree(tr);
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return error;
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}
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static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
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{
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fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
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fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
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tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
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test_bit(TR_TOUCHED, &tr->tr_flags));
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fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u\n",
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tr->tr_num_buf_new, tr->tr_num_buf_rm,
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tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
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tr->tr_num_revoke);
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}
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void gfs2_trans_end(struct gfs2_sbd *sdp)
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{
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struct gfs2_trans *tr = current->journal_info;
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s64 nbuf;
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int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
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current->journal_info = NULL;
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if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
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gfs2_log_release(sdp, tr->tr_reserved);
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if (alloced) {
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kfree(tr);
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sb_end_intwrite(sdp->sd_vfs);
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}
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return;
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}
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nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
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nbuf -= tr->tr_num_buf_rm;
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nbuf -= tr->tr_num_databuf_rm;
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if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
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(tr->tr_num_revoke <= tr->tr_revokes)))
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gfs2_print_trans(sdp, tr);
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gfs2_log_commit(sdp, tr);
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if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
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kfree(tr);
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up_read(&sdp->sd_log_flush_lock);
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if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
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gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
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GFS2_LFC_TRANS_END);
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if (alloced)
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sb_end_intwrite(sdp->sd_vfs);
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}
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static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
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struct buffer_head *bh)
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{
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struct gfs2_bufdata *bd;
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bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
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bd->bd_bh = bh;
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bd->bd_gl = gl;
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INIT_LIST_HEAD(&bd->bd_list);
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bh->b_private = bd;
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return bd;
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}
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/**
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* gfs2_trans_add_data - Add a databuf to the transaction.
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* @gl: The inode glock associated with the buffer
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* @bh: The buffer to add
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*
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* This is used in journaled data mode.
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* We need to journal the data block in the same way as metadata in
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* the functions above. The difference is that here we have a tag
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* which is two __be64's being the block number (as per meta data)
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* and a flag which says whether the data block needs escaping or
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* not. This means we need a new log entry for each 251 or so data
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* blocks, which isn't an enormous overhead but twice as much as
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* for normal metadata blocks.
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*/
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void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
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{
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struct gfs2_trans *tr = current->journal_info;
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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struct gfs2_bufdata *bd;
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lock_buffer(bh);
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if (buffer_pinned(bh)) {
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set_bit(TR_TOUCHED, &tr->tr_flags);
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goto out;
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}
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gfs2_log_lock(sdp);
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bd = bh->b_private;
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if (bd == NULL) {
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gfs2_log_unlock(sdp);
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unlock_buffer(bh);
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if (bh->b_private == NULL)
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bd = gfs2_alloc_bufdata(gl, bh);
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else
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bd = bh->b_private;
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lock_buffer(bh);
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gfs2_log_lock(sdp);
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}
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gfs2_assert(sdp, bd->bd_gl == gl);
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set_bit(TR_TOUCHED, &tr->tr_flags);
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if (list_empty(&bd->bd_list)) {
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set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
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set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
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gfs2_pin(sdp, bd->bd_bh);
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tr->tr_num_databuf_new++;
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list_add_tail(&bd->bd_list, &tr->tr_databuf);
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}
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gfs2_log_unlock(sdp);
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out:
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unlock_buffer(bh);
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}
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void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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struct gfs2_bufdata *bd;
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struct gfs2_meta_header *mh;
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struct gfs2_trans *tr = current->journal_info;
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enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
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lock_buffer(bh);
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if (buffer_pinned(bh)) {
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set_bit(TR_TOUCHED, &tr->tr_flags);
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goto out;
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}
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gfs2_log_lock(sdp);
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bd = bh->b_private;
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if (bd == NULL) {
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gfs2_log_unlock(sdp);
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unlock_buffer(bh);
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lock_page(bh->b_page);
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if (bh->b_private == NULL)
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bd = gfs2_alloc_bufdata(gl, bh);
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else
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bd = bh->b_private;
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unlock_page(bh->b_page);
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lock_buffer(bh);
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gfs2_log_lock(sdp);
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}
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gfs2_assert(sdp, bd->bd_gl == gl);
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set_bit(TR_TOUCHED, &tr->tr_flags);
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if (!list_empty(&bd->bd_list))
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goto out_unlock;
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set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
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set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
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mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
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if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
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fs_err(sdp, "Attempting to add uninitialised block to "
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"journal (inplace block=%lld)\n",
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(unsigned long long)bd->bd_bh->b_blocknr);
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BUG();
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}
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if (unlikely(state == SFS_FROZEN)) {
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fs_info(sdp, "GFS2:adding buf while frozen\n");
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gfs2_assert_withdraw(sdp, 0);
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}
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gfs2_pin(sdp, bd->bd_bh);
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mh->__pad0 = cpu_to_be64(0);
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mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
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list_add(&bd->bd_list, &tr->tr_buf);
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tr->tr_num_buf_new++;
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out_unlock:
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gfs2_log_unlock(sdp);
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out:
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unlock_buffer(bh);
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}
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void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
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{
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struct gfs2_trans *tr = current->journal_info;
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BUG_ON(!list_empty(&bd->bd_list));
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gfs2_add_revoke(sdp, bd);
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set_bit(TR_TOUCHED, &tr->tr_flags);
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tr->tr_num_revoke++;
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}
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void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
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{
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struct gfs2_bufdata *bd, *tmp;
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struct gfs2_trans *tr = current->journal_info;
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unsigned int n = len;
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gfs2_log_lock(sdp);
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list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
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if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
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list_del_init(&bd->bd_list);
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gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
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sdp->sd_log_num_revoke--;
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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tr->tr_num_revoke--;
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if (--n == 0)
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break;
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}
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}
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gfs2_log_unlock(sdp);
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}
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