162 lines
3.7 KiB
C
162 lines
3.7 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/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/mm.h>
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#include <linux/pagemap.h>
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#include <linux/gfs2_ondisk.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 "bmap.h"
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#include "glock.h"
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#include "inode.h"
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#include "ops_vm.h"
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#include "quota.h"
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#include "rgrp.h"
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#include "trans.h"
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#include "util.h"
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static struct page *gfs2_private_nopage(struct vm_area_struct *area,
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unsigned long address, int *type)
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{
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struct gfs2_inode *ip = GFS2_I(area->vm_file->f_mapping->host);
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set_bit(GIF_PAGED, &ip->i_flags);
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return filemap_nopage(area, address, type);
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}
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static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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unsigned long index = page->index;
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u64 lblock = index << (PAGE_CACHE_SHIFT -
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sdp->sd_sb.sb_bsize_shift);
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unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
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struct gfs2_alloc *al;
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unsigned int data_blocks, ind_blocks;
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unsigned int x;
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int error;
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al = gfs2_alloc_get(ip);
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error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
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if (error)
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goto out;
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error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
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if (error)
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goto out_gunlock_q;
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gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
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al->al_requested = data_blocks + ind_blocks;
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error = gfs2_inplace_reserve(ip);
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if (error)
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goto out_gunlock_q;
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error = gfs2_trans_begin(sdp, al->al_rgd->rd_ri.ri_length +
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ind_blocks + RES_DINODE +
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RES_STATFS + RES_QUOTA, 0);
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if (error)
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goto out_ipres;
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if (gfs2_is_stuffed(ip)) {
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error = gfs2_unstuff_dinode(ip, NULL);
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if (error)
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goto out_trans;
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}
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for (x = 0; x < blocks; ) {
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u64 dblock;
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unsigned int extlen;
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int new = 1;
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error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen);
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if (error)
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goto out_trans;
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lblock += extlen;
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x += extlen;
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}
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gfs2_assert_warn(sdp, al->al_alloced);
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out_trans:
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gfs2_trans_end(sdp);
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out_ipres:
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gfs2_inplace_release(ip);
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out_gunlock_q:
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gfs2_quota_unlock(ip);
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out:
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gfs2_alloc_put(ip);
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return error;
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}
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static struct page *gfs2_sharewrite_nopage(struct vm_area_struct *area,
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unsigned long address, int *type)
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{
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struct file *file = area->vm_file;
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struct gfs2_file *gf = file->private_data;
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struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
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struct gfs2_holder i_gh;
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struct page *result = NULL;
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unsigned long index = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) +
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area->vm_pgoff;
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int alloc_required;
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int error;
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
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if (error)
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return NULL;
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set_bit(GIF_PAGED, &ip->i_flags);
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set_bit(GIF_SW_PAGED, &ip->i_flags);
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error = gfs2_write_alloc_required(ip, (u64)index << PAGE_CACHE_SHIFT,
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PAGE_CACHE_SIZE, &alloc_required);
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if (error)
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goto out;
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set_bit(GFF_EXLOCK, &gf->f_flags);
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result = filemap_nopage(area, address, type);
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clear_bit(GFF_EXLOCK, &gf->f_flags);
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if (!result || result == NOPAGE_OOM)
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goto out;
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if (alloc_required) {
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error = alloc_page_backing(ip, result);
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if (error) {
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page_cache_release(result);
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result = NULL;
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goto out;
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}
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set_page_dirty(result);
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}
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out:
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gfs2_glock_dq_uninit(&i_gh);
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return result;
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}
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struct vm_operations_struct gfs2_vm_ops_private = {
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.nopage = gfs2_private_nopage,
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};
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struct vm_operations_struct gfs2_vm_ops_sharewrite = {
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.nopage = gfs2_sharewrite_nopage,
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};
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