2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
16 #include <linux/pagemap.h>
17 #include <linux/gfs2_ondisk.h>
20 #include "lm_interface.h"
32 static void pfault_be_greedy(struct gfs2_inode *ip)
36 spin_lock(&ip->i_spin);
38 ip->i_last_pfault = jiffies;
39 spin_unlock(&ip->i_spin);
42 if (gfs2_glock_be_greedy(ip->i_gl, time))
46 static struct page *gfs2_private_nopage(struct vm_area_struct *area,
47 unsigned long address, int *type)
49 struct gfs2_inode *ip = GFS2_I(area->vm_file->f_mapping->host);
50 struct gfs2_holder i_gh;
54 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
58 set_bit(GIF_PAGED, &ip->i_flags);
60 result = filemap_nopage(area, address, type);
62 if (result && result != NOPAGE_OOM)
65 gfs2_glock_dq_uninit(&i_gh);
70 static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
72 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
73 unsigned long index = page->index;
74 uint64_t lblock = index << (PAGE_CACHE_SHIFT -
75 sdp->sd_sb.sb_bsize_shift);
76 unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
77 struct gfs2_alloc *al;
78 unsigned int data_blocks, ind_blocks;
82 al = gfs2_alloc_get(ip);
84 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
88 error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
92 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
94 al->al_requested = data_blocks + ind_blocks;
96 error = gfs2_inplace_reserve(ip);
100 error = gfs2_trans_begin(sdp, al->al_rgd->rd_ri.ri_length +
101 ind_blocks + RES_DINODE +
102 RES_STATFS + RES_QUOTA, 0);
106 if (gfs2_is_stuffed(ip)) {
107 error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, NULL);
112 for (x = 0; x < blocks; ) {
117 error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen);
125 gfs2_assert_warn(sdp, al->al_alloced);
131 gfs2_inplace_release(ip);
134 gfs2_quota_unlock(ip);
142 static struct page *gfs2_sharewrite_nopage(struct vm_area_struct *area,
143 unsigned long address, int *type)
145 struct gfs2_inode *ip = GFS2_I(area->vm_file->f_mapping->host);
146 struct gfs2_holder i_gh;
147 struct page *result = NULL;
148 unsigned long index = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) +
153 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
157 set_bit(GIF_PAGED, &ip->i_flags);
158 set_bit(GIF_SW_PAGED, &ip->i_flags);
160 error = gfs2_write_alloc_required(ip,
161 (uint64_t)index << PAGE_CACHE_SHIFT,
162 PAGE_CACHE_SIZE, &alloc_required);
166 result = filemap_nopage(area, address, type);
167 if (!result || result == NOPAGE_OOM)
170 if (alloc_required) {
171 error = alloc_page_backing(ip, result);
173 page_cache_release(result);
177 set_page_dirty(result);
180 pfault_be_greedy(ip);
183 gfs2_glock_dq_uninit(&i_gh);
188 struct vm_operations_struct gfs2_vm_ops_private = {
189 .nopage = gfs2_private_nopage,
192 struct vm_operations_struct gfs2_vm_ops_sharewrite = {
193 .nopage = gfs2_sharewrite_nopage,