This has a number of advantages: - Reduces contention on the hash table lock - Makes the code smaller and simpler - Should speed up glock dumps when under load - Removes ref count changing in examine_bucket - No longer need hash chain lock in glock_put() in common case There are some further changes which this enables and which we may do in the future. One is to look at using SLAB_RCU, and another is to look at using a per-cpu counter for the per-sb glock counter, since that is touched twice in the lifetime of each glock (but only used at umount time). Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
456 lines
11 KiB
C
456 lines
11 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* 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/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/bio.h>
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#include <linux/posix_acl.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 "glops.h"
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#include "inode.h"
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#include "log.h"
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#include "meta_io.h"
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#include "recovery.h"
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#include "rgrp.h"
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#include "util.h"
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#include "trans.h"
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/**
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* ail_empty_gl - remove all buffers for a given lock from the AIL
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* @gl: the glock
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*
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* None of the buffers should be dirty, locked, or pinned.
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*/
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static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct list_head *head = &gl->gl_ail_list;
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struct gfs2_bufdata *bd;
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struct buffer_head *bh;
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struct gfs2_trans tr;
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memset(&tr, 0, sizeof(tr));
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tr.tr_revokes = atomic_read(&gl->gl_ail_count);
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if (!tr.tr_revokes)
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return;
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/* A shortened, inline version of gfs2_trans_begin() */
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tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
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tr.tr_ip = (unsigned long)__builtin_return_address(0);
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INIT_LIST_HEAD(&tr.tr_list_buf);
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gfs2_log_reserve(sdp, tr.tr_reserved);
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BUG_ON(current->journal_info);
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current->journal_info = &tr;
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gfs2_log_lock(sdp);
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while (!list_empty(head)) {
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bd = list_entry(head->next, struct gfs2_bufdata,
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bd_ail_gl_list);
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bh = bd->bd_bh;
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gfs2_remove_from_ail(bd);
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bd->bd_bh = NULL;
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bh->b_private = NULL;
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bd->bd_blkno = bh->b_blocknr;
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gfs2_assert_withdraw(sdp, !buffer_busy(bh));
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gfs2_trans_add_revoke(sdp, bd);
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}
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gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
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gfs2_log_unlock(sdp);
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gfs2_trans_end(sdp);
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gfs2_log_flush(sdp, NULL);
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}
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/**
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* rgrp_go_sync - sync out the metadata for this glock
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* @gl: the glock
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*
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* Called when demoting or unlocking an EX glock. We must flush
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* to disk all dirty buffers/pages relating to this glock, and must not
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* not return to caller to demote/unlock the glock until I/O is complete.
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*/
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static void rgrp_go_sync(struct gfs2_glock *gl)
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{
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struct address_space *metamapping = gfs2_glock2aspace(gl);
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int error;
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if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
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return;
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BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
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gfs2_log_flush(gl->gl_sbd, gl);
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filemap_fdatawrite(metamapping);
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error = filemap_fdatawait(metamapping);
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mapping_set_error(metamapping, error);
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gfs2_ail_empty_gl(gl);
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}
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/**
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* rgrp_go_inval - invalidate the metadata for this glock
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* @gl: the glock
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* @flags:
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*
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* We never used LM_ST_DEFERRED with resource groups, so that we
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* should always see the metadata flag set here.
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*
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*/
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static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
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{
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struct address_space *mapping = gfs2_glock2aspace(gl);
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BUG_ON(!(flags & DIO_METADATA));
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gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
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truncate_inode_pages(mapping, 0);
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if (gl->gl_object) {
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struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
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rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
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}
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}
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/**
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* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
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* @gl: the glock protecting the inode
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*
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*/
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static void inode_go_sync(struct gfs2_glock *gl)
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{
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struct gfs2_inode *ip = gl->gl_object;
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struct address_space *metamapping = gfs2_glock2aspace(gl);
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int error;
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if (ip && !S_ISREG(ip->i_inode.i_mode))
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ip = NULL;
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if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
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unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
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if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
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return;
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BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
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gfs2_log_flush(gl->gl_sbd, gl);
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filemap_fdatawrite(metamapping);
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if (ip) {
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struct address_space *mapping = ip->i_inode.i_mapping;
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filemap_fdatawrite(mapping);
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error = filemap_fdatawait(mapping);
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mapping_set_error(mapping, error);
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}
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error = filemap_fdatawait(metamapping);
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mapping_set_error(metamapping, error);
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gfs2_ail_empty_gl(gl);
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/*
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* Writeback of the data mapping may cause the dirty flag to be set
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* so we have to clear it again here.
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*/
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smp_mb__before_clear_bit();
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clear_bit(GLF_DIRTY, &gl->gl_flags);
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}
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/**
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* inode_go_inval - prepare a inode glock to be released
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* @gl: the glock
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* @flags:
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*
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* Normally we invlidate everything, but if we are moving into
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* LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
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* can keep hold of the metadata, since it won't have changed.
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*
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*/
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static void inode_go_inval(struct gfs2_glock *gl, int flags)
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{
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struct gfs2_inode *ip = gl->gl_object;
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gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
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if (flags & DIO_METADATA) {
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struct address_space *mapping = gfs2_glock2aspace(gl);
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truncate_inode_pages(mapping, 0);
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if (ip) {
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set_bit(GIF_INVALID, &ip->i_flags);
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forget_all_cached_acls(&ip->i_inode);
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}
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}
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if (ip == GFS2_I(gl->gl_sbd->sd_rindex))
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gl->gl_sbd->sd_rindex_uptodate = 0;
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if (ip && S_ISREG(ip->i_inode.i_mode))
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truncate_inode_pages(ip->i_inode.i_mapping, 0);
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}
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/**
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* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
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* @gl: the glock
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*
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* Returns: 1 if it's ok
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*/
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static int inode_go_demote_ok(const struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_holder *gh;
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if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
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return 0;
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if (!list_empty(&gl->gl_holders)) {
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gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
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if (gh->gh_list.next != &gl->gl_holders)
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return 0;
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}
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return 1;
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}
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/**
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* inode_go_lock - operation done after an inode lock is locked by a process
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* @gl: the glock
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* @flags:
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*
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* Returns: errno
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*/
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static int inode_go_lock(struct gfs2_holder *gh)
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{
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struct gfs2_glock *gl = gh->gh_gl;
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_inode *ip = gl->gl_object;
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int error = 0;
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if (!ip || (gh->gh_flags & GL_SKIP))
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return 0;
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if (test_bit(GIF_INVALID, &ip->i_flags)) {
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error = gfs2_inode_refresh(ip);
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if (error)
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return error;
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}
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if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
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(gl->gl_state == LM_ST_EXCLUSIVE) &&
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(gh->gh_state == LM_ST_EXCLUSIVE)) {
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spin_lock(&sdp->sd_trunc_lock);
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if (list_empty(&ip->i_trunc_list))
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list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
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spin_unlock(&sdp->sd_trunc_lock);
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wake_up(&sdp->sd_quota_wait);
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return 1;
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}
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return error;
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}
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/**
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* inode_go_dump - print information about an inode
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* @seq: The iterator
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* @ip: the inode
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*
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* Returns: 0 on success, -ENOBUFS when we run out of space
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*/
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static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
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{
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const struct gfs2_inode *ip = gl->gl_object;
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if (ip == NULL)
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return 0;
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gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
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(unsigned long long)ip->i_no_formal_ino,
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(unsigned long long)ip->i_no_addr,
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IF2DT(ip->i_inode.i_mode), ip->i_flags,
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(unsigned int)ip->i_diskflags,
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(unsigned long long)i_size_read(&ip->i_inode));
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return 0;
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}
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/**
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* rgrp_go_lock - operation done after an rgrp lock is locked by
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* a first holder on this node.
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* @gl: the glock
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* @flags:
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*
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* Returns: errno
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*/
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static int rgrp_go_lock(struct gfs2_holder *gh)
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{
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return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
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}
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/**
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* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
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* a last holder on this node.
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* @gl: the glock
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* @flags:
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*
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*/
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static void rgrp_go_unlock(struct gfs2_holder *gh)
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{
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gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
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}
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/**
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* trans_go_sync - promote/demote the transaction glock
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* @gl: the glock
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* @state: the requested state
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* @flags:
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*
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*/
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static void trans_go_sync(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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if (gl->gl_state != LM_ST_UNLOCKED &&
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test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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gfs2_meta_syncfs(sdp);
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gfs2_log_shutdown(sdp);
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}
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}
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/**
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* trans_go_xmote_bh - After promoting/demoting the transaction glock
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* @gl: the glock
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*
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*/
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static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
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{
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struct gfs2_sbd *sdp = gl->gl_sbd;
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struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
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struct gfs2_glock *j_gl = ip->i_gl;
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struct gfs2_log_header_host head;
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int error;
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if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
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j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
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error = gfs2_find_jhead(sdp->sd_jdesc, &head);
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if (error)
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gfs2_consist(sdp);
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if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
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gfs2_consist(sdp);
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/* Initialize some head of the log stuff */
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if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
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sdp->sd_log_sequence = head.lh_sequence + 1;
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gfs2_log_pointers_init(sdp, head.lh_blkno);
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}
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}
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return 0;
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}
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/**
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* trans_go_demote_ok
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* @gl: the glock
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*
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* Always returns 0
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*/
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static int trans_go_demote_ok(const struct gfs2_glock *gl)
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{
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return 0;
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}
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/**
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* iopen_go_callback - schedule the dcache entry for the inode to be deleted
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* @gl: the glock
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*
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* gl_spin lock is held while calling this
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*/
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static void iopen_go_callback(struct gfs2_glock *gl)
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{
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struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
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if (gl->gl_demote_state == LM_ST_UNLOCKED &&
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gl->gl_state == LM_ST_SHARED && ip) {
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gfs2_glock_hold(gl);
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if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
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gfs2_glock_put_nolock(gl);
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}
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}
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const struct gfs2_glock_operations gfs2_meta_glops = {
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.go_type = LM_TYPE_META,
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};
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const struct gfs2_glock_operations gfs2_inode_glops = {
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.go_xmote_th = inode_go_sync,
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.go_inval = inode_go_inval,
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.go_demote_ok = inode_go_demote_ok,
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.go_lock = inode_go_lock,
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.go_dump = inode_go_dump,
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.go_type = LM_TYPE_INODE,
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.go_min_hold_time = HZ / 5,
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.go_flags = GLOF_ASPACE,
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};
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const struct gfs2_glock_operations gfs2_rgrp_glops = {
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.go_xmote_th = rgrp_go_sync,
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.go_inval = rgrp_go_inval,
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.go_lock = rgrp_go_lock,
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.go_unlock = rgrp_go_unlock,
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.go_dump = gfs2_rgrp_dump,
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.go_type = LM_TYPE_RGRP,
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.go_min_hold_time = HZ / 5,
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.go_flags = GLOF_ASPACE,
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};
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const struct gfs2_glock_operations gfs2_trans_glops = {
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.go_xmote_th = trans_go_sync,
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.go_xmote_bh = trans_go_xmote_bh,
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.go_demote_ok = trans_go_demote_ok,
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.go_type = LM_TYPE_NONDISK,
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};
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const struct gfs2_glock_operations gfs2_iopen_glops = {
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.go_type = LM_TYPE_IOPEN,
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.go_callback = iopen_go_callback,
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};
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const struct gfs2_glock_operations gfs2_flock_glops = {
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.go_type = LM_TYPE_FLOCK,
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};
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const struct gfs2_glock_operations gfs2_nondisk_glops = {
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.go_type = LM_TYPE_NONDISK,
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};
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const struct gfs2_glock_operations gfs2_quota_glops = {
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.go_type = LM_TYPE_QUOTA,
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};
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const struct gfs2_glock_operations gfs2_journal_glops = {
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.go_type = LM_TYPE_JOURNAL,
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};
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const struct gfs2_glock_operations *gfs2_glops_list[] = {
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[LM_TYPE_META] = &gfs2_meta_glops,
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[LM_TYPE_INODE] = &gfs2_inode_glops,
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[LM_TYPE_RGRP] = &gfs2_rgrp_glops,
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[LM_TYPE_IOPEN] = &gfs2_iopen_glops,
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[LM_TYPE_FLOCK] = &gfs2_flock_glops,
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[LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
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[LM_TYPE_QUOTA] = &gfs2_quota_glops,
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[LM_TYPE_JOURNAL] = &gfs2_journal_glops,
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};
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