The "greedy" code was an attempt to retain glocks for a minimum length of time when they relate to mmap()ed files. The current implementation of this feature is not, however, ideal in that it required allocating memory in order to do this and its overly complicated. It also misses the mark by ignoring the other I/O operations which are just as likely to suffer from the same problem. So the plan is to remove this now and then add the functionality back as part of the glock state machine at a later date (and thus take into account all the possible users of this feature) Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
|
|
* 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/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
#include <linux/lm_interface.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "bmap.h"
|
|
#include "glock.h"
|
|
#include "inode.h"
|
|
#include "ops_vm.h"
|
|
#include "quota.h"
|
|
#include "rgrp.h"
|
|
#include "trans.h"
|
|
#include "util.h"
|
|
|
|
static struct page *gfs2_private_nopage(struct vm_area_struct *area,
|
|
unsigned long address, int *type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(area->vm_file->f_mapping->host);
|
|
|
|
set_bit(GIF_PAGED, &ip->i_flags);
|
|
return filemap_nopage(area, address, type);
|
|
}
|
|
|
|
static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
|
|
{
|
|
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
|
|
unsigned long index = page->index;
|
|
u64 lblock = index << (PAGE_CACHE_SHIFT -
|
|
sdp->sd_sb.sb_bsize_shift);
|
|
unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
|
|
struct gfs2_alloc *al;
|
|
unsigned int data_blocks, ind_blocks;
|
|
unsigned int x;
|
|
int error;
|
|
|
|
al = gfs2_alloc_get(ip);
|
|
|
|
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
|
|
|
|
al->al_requested = data_blocks + ind_blocks;
|
|
|
|
error = gfs2_inplace_reserve(ip);
|
|
if (error)
|
|
goto out_gunlock_q;
|
|
|
|
error = gfs2_trans_begin(sdp, al->al_rgd->rd_ri.ri_length +
|
|
ind_blocks + RES_DINODE +
|
|
RES_STATFS + RES_QUOTA, 0);
|
|
if (error)
|
|
goto out_ipres;
|
|
|
|
if (gfs2_is_stuffed(ip)) {
|
|
error = gfs2_unstuff_dinode(ip, NULL);
|
|
if (error)
|
|
goto out_trans;
|
|
}
|
|
|
|
for (x = 0; x < blocks; ) {
|
|
u64 dblock;
|
|
unsigned int extlen;
|
|
int new = 1;
|
|
|
|
error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen);
|
|
if (error)
|
|
goto out_trans;
|
|
|
|
lblock += extlen;
|
|
x += extlen;
|
|
}
|
|
|
|
gfs2_assert_warn(sdp, al->al_alloced);
|
|
|
|
out_trans:
|
|
gfs2_trans_end(sdp);
|
|
out_ipres:
|
|
gfs2_inplace_release(ip);
|
|
out_gunlock_q:
|
|
gfs2_quota_unlock(ip);
|
|
out:
|
|
gfs2_alloc_put(ip);
|
|
return error;
|
|
}
|
|
|
|
static struct page *gfs2_sharewrite_nopage(struct vm_area_struct *area,
|
|
unsigned long address, int *type)
|
|
{
|
|
struct file *file = area->vm_file;
|
|
struct gfs2_file *gf = file->private_data;
|
|
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
|
|
struct gfs2_holder i_gh;
|
|
struct page *result = NULL;
|
|
unsigned long index = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) +
|
|
area->vm_pgoff;
|
|
int alloc_required;
|
|
int error;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
|
|
if (error)
|
|
return NULL;
|
|
|
|
set_bit(GIF_PAGED, &ip->i_flags);
|
|
set_bit(GIF_SW_PAGED, &ip->i_flags);
|
|
|
|
error = gfs2_write_alloc_required(ip, (u64)index << PAGE_CACHE_SHIFT,
|
|
PAGE_CACHE_SIZE, &alloc_required);
|
|
if (error)
|
|
goto out;
|
|
|
|
set_bit(GFF_EXLOCK, &gf->f_flags);
|
|
result = filemap_nopage(area, address, type);
|
|
clear_bit(GFF_EXLOCK, &gf->f_flags);
|
|
if (!result || result == NOPAGE_OOM)
|
|
goto out;
|
|
|
|
if (alloc_required) {
|
|
error = alloc_page_backing(ip, result);
|
|
if (error) {
|
|
page_cache_release(result);
|
|
result = NULL;
|
|
goto out;
|
|
}
|
|
set_page_dirty(result);
|
|
}
|
|
|
|
out:
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
|
|
return result;
|
|
}
|
|
|
|
struct vm_operations_struct gfs2_vm_ops_private = {
|
|
.nopage = gfs2_private_nopage,
|
|
};
|
|
|
|
struct vm_operations_struct gfs2_vm_ops_sharewrite = {
|
|
.nopage = gfs2_sharewrite_nopage,
|
|
};
|
|
|