![Steven Whitehouse](/assets/img/avatar_default.png)
The only reason for adding glocks to the journal was to keep track of which locks required a log flush prior to release. We add a flag to the glock to allow this check to be made in a simpler way. This reduces the size of a glock (by 12 bytes on i386, 24 on x86_64) and means that we can avoid extra work during the journal flush. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
180 lines
4.2 KiB
C
180 lines
4.2 KiB
C
/*
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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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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/kallsyms.h>
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#include <linux/lm_interface.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 "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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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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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 = (unsigned long)__builtin_return_address(0);
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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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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_list_buf);
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gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
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error = gfs2_glock_nq(&tr->tr_t_gh);
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if (error)
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goto fail_holder_uninit;
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if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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tr->tr_t_gh.gh_flags |= GL_NOCACHE;
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error = -EROFS;
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goto fail_gunlock;
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}
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error = gfs2_log_reserve(sdp, tr->tr_reserved);
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if (error)
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goto fail_gunlock;
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current->journal_info = tr;
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return 0;
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fail_gunlock:
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gfs2_glock_dq(&tr->tr_t_gh);
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fail_holder_uninit:
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gfs2_holder_uninit(&tr->tr_t_gh);
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kfree(tr);
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return error;
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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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BUG_ON(!tr);
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current->journal_info = NULL;
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if (!tr->tr_touched) {
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gfs2_log_release(sdp, tr->tr_reserved);
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gfs2_glock_dq(&tr->tr_t_gh);
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gfs2_holder_uninit(&tr->tr_t_gh);
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kfree(tr);
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return;
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}
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if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
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fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
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tr->tr_num_buf, tr->tr_blocks);
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print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
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}
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if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
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fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
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tr->tr_num_revoke, tr->tr_revokes);
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print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
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}
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gfs2_log_commit(sdp, tr);
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gfs2_glock_dq(&tr->tr_t_gh);
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gfs2_holder_uninit(&tr->tr_t_gh);
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kfree(tr);
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if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
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gfs2_log_flush(sdp, NULL);
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}
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/**
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* gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
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* @gl: the glock the buffer belongs to
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* @bh: The buffer to add
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* @meta: True in the case of adding metadata
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*
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*/
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void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_bufdata *bd;
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bd = bh->b_private;
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if (bd)
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gfs2_assert(sdp, bd->bd_gl == gl);
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else {
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gfs2_attach_bufdata(gl, bh, meta);
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bd = bh->b_private;
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}
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lops_add(sdp, &bd->bd_le);
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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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BUG_ON(!list_empty(&bd->bd_le.le_list));
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BUG_ON(!list_empty(&bd->bd_ail_st_list));
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BUG_ON(!list_empty(&bd->bd_ail_gl_list));
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lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
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lops_add(sdp, &bd->bd_le);
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}
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void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)
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{
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struct gfs2_bufdata *bd;
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int found = 0;
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gfs2_log_lock(sdp);
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list_for_each_entry(bd, &sdp->sd_log_le_revoke, bd_le.le_list) {
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if (bd->bd_blkno == blkno) {
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list_del_init(&bd->bd_le.le_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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found = 1;
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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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if (found) {
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struct gfs2_trans *tr = current->journal_info;
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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tr->tr_num_revoke_rm++;
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}
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}
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void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
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{
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lops_add(rgd->rd_sbd, &rgd->rd_le);
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}
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