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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "recovery.h"
#include "rgrp.h"
#include "util.h"
#include "trans.h"
/**
* ail_empty_gl - remove all buffers for a given lock from the AIL
* @gl: the glock
*
* None of the buffers should be dirty, locked, or pinned.
*/
static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
unsigned int blocks;
struct list_head *head = &gl->gl_ail_list;
struct gfs2_bufdata *bd;
struct buffer_head *bh;
int error;
blocks = atomic_read(&gl->gl_ail_count);
if (!blocks)
return;
error = gfs2_trans_begin(sdp, 0, blocks);
if (gfs2_assert_withdraw(sdp, !error))
return;
gfs2_log_lock(sdp);
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata,
bd_ail_gl_list);
bh = bd->bd_bh;
gfs2_remove_from_ail(bd);
bd->bd_bh = NULL;
bh->b_private = NULL;
bd->bd_blkno = bh->b_blocknr;
gfs2_assert_withdraw(sdp, !buffer_busy(bh));
gfs2_trans_add_revoke(sdp, bd);
}
gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
gfs2_log_unlock(sdp);
gfs2_trans_end(sdp);
gfs2_log_flush(sdp, NULL);
}
/**
* gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
* @gl: the glock
*
*/
static void gfs2_pte_inval(struct gfs2_glock *gl)
{
struct gfs2_inode *ip;
struct inode *inode;
ip = gl->gl_object;
inode = &ip->i_inode;
if (!ip || !S_ISREG(inode->i_mode))
return;
unmap_shared_mapping_range(inode->i_mapping, 0, 0);
if (test_bit(GIF_SW_PAGED, &ip->i_flags))
set_bit(GLF_DIRTY, &gl->gl_flags);
}
/**
* meta_go_sync - sync out the metadata for this glock
* @gl: the glock
*
* Called when demoting or unlocking an EX glock. We must flush
* to disk all dirty buffers/pages relating to this glock, and must not
* not return to caller to demote/unlock the glock until I/O is complete.
*/
static void meta_go_sync(struct gfs2_glock *gl)
{
if (gl->gl_state != LM_ST_EXCLUSIVE)
return;
if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
gfs2_log_flush(gl->gl_sbd, gl);
gfs2_meta_sync(gl);
gfs2_ail_empty_gl(gl);
}
}
/**
* meta_go_inval - invalidate the metadata for this glock
* @gl: the glock
* @flags:
*
*/
static void meta_go_inval(struct gfs2_glock *gl, int flags)
{
if (!(flags & DIO_METADATA))
return;
gfs2_meta_inval(gl);
if (gl->gl_object == GFS2_I(gl->gl_sbd->sd_rindex))
gl->gl_sbd->sd_rindex_uptodate = 0;
else if (gl->gl_ops == &gfs2_rgrp_glops && gl->gl_object) {
struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
}
}
/**
* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
* @gl: the glock protecting the inode
*
*/
static void inode_go_sync(struct gfs2_glock *gl)
{
struct gfs2_inode *ip = gl->gl_object;
struct address_space *metamapping = gl->gl_aspace->i_mapping;
int error;
if (gl->gl_state != LM_ST_UNLOCKED)
gfs2_pte_inval(gl);
if (gl->gl_state != LM_ST_EXCLUSIVE)
return;
if (ip && !S_ISREG(ip->i_inode.i_mode))
ip = NULL;
if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
gfs2_log_flush(gl->gl_sbd, gl);
filemap_fdatawrite(metamapping);
if (ip) {
struct address_space *mapping = ip->i_inode.i_mapping;
filemap_fdatawrite(mapping);
error = filemap_fdatawait(mapping);
mapping_set_error(mapping, error);
}
error = filemap_fdatawait(metamapping);
mapping_set_error(metamapping, error);
clear_bit(GLF_DIRTY, &gl->gl_flags);
gfs2_ail_empty_gl(gl);
}
}
/**
* inode_go_xmote_bh - After promoting/demoting a glock
* @gl: the glock
*
*/
static void inode_go_xmote_bh(struct gfs2_glock *gl)
{
struct gfs2_holder *gh = gl->gl_req_gh;
struct buffer_head *bh;
int error;
if (gl->gl_state != LM_ST_UNLOCKED &&
(!gh || !(gh->gh_flags & GL_SKIP))) {
error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
if (!error)
brelse(bh);
}
}
/**
* inode_go_inval - prepare a inode glock to be released
* @gl: the glock
* @flags:
*
*/
static void inode_go_inval(struct gfs2_glock *gl, int flags)
{
struct gfs2_inode *ip = gl->gl_object;
int meta = (flags & DIO_METADATA);
if (meta) {
gfs2_meta_inval(gl);
if (ip)
set_bit(GIF_INVALID, &ip->i_flags);
}
if (ip && S_ISREG(ip->i_inode.i_mode))
truncate_inode_pages(ip->i_inode.i_mapping, 0);
}
/**
* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int inode_go_demote_ok(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
int demote = 0;
if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
demote = 1;
else if (!sdp->sd_args.ar_localcaching &&
time_after_eq(jiffies, gl->gl_stamp +
gfs2_tune_get(sdp, gt_demote_secs) * HZ))
demote = 1;
return demote;
}
/**
* inode_go_lock - operation done after an inode lock is locked by a process
* @gl: the glock
* @flags:
*
* Returns: errno
*/
static int inode_go_lock(struct gfs2_holder *gh)
{
struct gfs2_glock *gl = gh->gh_gl;
struct gfs2_inode *ip = gl->gl_object;
int error = 0;
if (!ip || (gh->gh_flags & GL_SKIP))
return 0;
if (test_bit(GIF_INVALID, &ip->i_flags)) {
error = gfs2_inode_refresh(ip);
if (error)
return error;
}
if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
(gl->gl_state == LM_ST_EXCLUSIVE) &&
(gh->gh_state == LM_ST_EXCLUSIVE))
error = gfs2_truncatei_resume(ip);
return error;
}
/**
* rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int rgrp_go_demote_ok(struct gfs2_glock *gl)
{
return !gl->gl_aspace->i_mapping->nrpages;
}
/**
* rgrp_go_lock - operation done after an rgrp lock is locked by
* a first holder on this node.
* @gl: the glock
* @flags:
*
* Returns: errno
*/
static int rgrp_go_lock(struct gfs2_holder *gh)
{
return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
}
/**
* rgrp_go_unlock - operation done before an rgrp lock is unlocked by
* a last holder on this node.
* @gl: the glock
* @flags:
*
*/
static void rgrp_go_unlock(struct gfs2_holder *gh)
{
gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
}
/**
* trans_go_sync - promote/demote the transaction glock
* @gl: the glock
* @state: the requested state
* @flags:
*
*/
static void trans_go_sync(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_sbd;
if
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