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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 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/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/gfs2_ondisk.h>
#include "gfs2.h"
#include "lm_interface.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"
/**
* 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(ip->i_di.di_mode))
return;
if (!test_bit(GIF_PAGED, &ip->i_flags))
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);
clear_bit(GIF_SW_PAGED, &ip->i_flags);
}
/**
* gfs2_page_inval - Invalidate all pages associated with a glock
* @gl: the glock
*
*/
static void gfs2_page_inval(struct gfs2_glock *gl)
{
struct gfs2_inode *ip;
struct inode *inode;
ip = gl->gl_object;
inode = &ip->i_inode;
if (!ip || !S_ISREG(ip->i_di.di_mode))
return;
truncate_inode_pages(inode->i_mapping, 0);
gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !inode->i_mapping->nrpages);
clear_bit(GIF_PAGED, &ip->i_flags);
}
/**
* gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
* @gl: the glock
* @flags: DIO_START | DIO_WAIT
*
* Syncs data (not metadata) for a regular file.
* No-op for all other types.
*/
static void gfs2_page_sync(struct gfs2_glock *gl, int flags)
{
struct gfs2_inode *ip;
struct inode *inode;
struct address_space *mapping;
int error = 0;
ip = gl->gl_object;
inode = &ip->i_inode;
if (!ip || !S_ISREG(ip->i_di.di_mode))
return;
mapping = inode->i_mapping;
if (flags & DIO_START)
filemap_fdatawrite(mapping);
if (!error && (flags & DIO_WAIT))
error = filemap_fdatawait(mapping);
/* Put back any errors cleared by filemap_fdatawait()
so they can be caught by someone who can pass them
up to user space. */
if (error == -ENOSPC)
set_bit(AS_ENOSPC, &mapping->flags);
else if (error)
set_bit(AS_EIO, &mapping->flags);
}
/**
* meta_go_sync - sync out the metadata for this glock
* @gl: the glock
* @flags: DIO_*
*
* 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, int flags)
{
if (!(flags & DIO_METADATA))
return;
if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
gfs2_log_flush(gl->gl_sbd, gl);
gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
if (flags & DIO_RELEASE)
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);
gl->gl_vn++;
}
/**
* inode_go_xmote_th - promote/demote a glock
* @gl: the glock
* @state: the requested state
* @flags:
*
*/
static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
int flags)
{
if (gl->gl_state != LM_ST_UNLOCKED)
gfs2_pte_inval(gl);
gfs2_glock_xmote_th(gl, state, flags);
}
/**
* 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, DIO_START,
&bh);
if (!error)
brelse(bh);
}
}
/**
* inode_go_drop_th - unlock a glock
* @gl: the glock
*
* Invoked from rq_demote().
* Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
* is being purged from our node's glock cache; we're dropping lock.
*/
static void inode_go_drop_th(struct gfs2_glock *gl)
{
gfs2_pte_inval(gl);
gfs2_glock_drop_th(gl);
}
/**
* inode_go_sync - Sync the dirty data and/or metadata for an inode glock
* @gl: the glock protecting the inode
* @flags:
*
*/
static void inode_go_sync(struct gfs2_glock *gl, int flags)
{
int meta = (flags & DIO_METADATA);
int data = (flags & DIO_DATA);
if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
if (meta && data) {
gfs2_page_sync(gl, flags | DIO_START);
gfs2_log_flush(gl->gl_sbd, gl);
gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
gfs2_page_sync(gl, flags | DIO_WAIT);
clear_bit(GLF_DIRTY, &gl->gl_flags);
} else if (meta) {
gfs2_log_flush(gl->gl_sbd, gl);
gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
} else if (data)
gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
if (flags & DIO_RELEASE)
gfs2_ail_empty_gl(gl);
}
}
/**
* 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)
{
int meta = (flags & DIO_METADATA);
int data = (flags & DIO_DATA);
if (meta) {
gfs2_meta_inval(gl);
gl->gl_vn++;
}
if (data)
gfs2_page_inval(gl);
}
/**
* 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
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