2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 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>
18 #include <asm/semaphore.h>
21 #include "lm_interface.h"
33 static void pfault_be_greedy(struct gfs2_inode *ip)
37 spin_lock(&ip->i_spin);
39 ip->i_last_pfault = jiffies;
40 spin_unlock(&ip->i_spin);
43 if (gfs2_glock_be_greedy(ip->i_gl, time))
47 static struct page *gfs2_private_nopage(struct vm_area_struct *area,
48 unsigned long address, int *type)
50 struct gfs2_inode *ip = area->vm_file->f_mapping->host->u.generic_ip;
51 struct gfs2_holder i_gh;
55 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
59 set_bit(GIF_PAGED, &ip->i_flags);
61 result = filemap_nopage(area, address, type);
63 if (result && result != NOPAGE_OOM)
66 gfs2_glock_dq_uninit(&i_gh);
71 static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
73 struct gfs2_sbd *sdp = ip->i_sbd;
74 unsigned long index = page->index;
75 uint64_t lblock = index << (PAGE_CACHE_SHIFT -
76 sdp->sd_sb.sb_bsize_shift);
77 unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
78 struct gfs2_alloc *al;
79 unsigned int data_blocks, ind_blocks;
83 al = gfs2_alloc_get(ip);
85 error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
89 error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
93 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE,
94 &data_blocks, &ind_blocks);
96 al->al_requested = data_blocks + ind_blocks;
98 error = gfs2_inplace_reserve(ip);
102 error = gfs2_trans_begin(sdp,
103 al->al_rgd->rd_ri.ri_length +
104 ind_blocks + RES_DINODE +
105 RES_STATFS + RES_QUOTA, 0);
109 if (gfs2_is_stuffed(ip)) {
110 error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, NULL);
115 for (x = 0; x < blocks; ) {
120 error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
128 gfs2_assert_warn(sdp, al->al_alloced);
134 gfs2_inplace_release(ip);
137 gfs2_quota_unlock(ip);
145 static struct page *gfs2_sharewrite_nopage(struct vm_area_struct *area,
146 unsigned long address, int *type)
148 struct gfs2_inode *ip = area->vm_file->f_mapping->host->u.generic_ip;
149 struct gfs2_holder i_gh;
150 struct page *result = NULL;
151 unsigned long index = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) +
156 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
160 set_bit(GIF_PAGED, &ip->i_flags);
161 set_bit(GIF_SW_PAGED, &ip->i_flags);
163 error = gfs2_write_alloc_required(ip,
164 (uint64_t)index << PAGE_CACHE_SHIFT,
165 PAGE_CACHE_SIZE, &alloc_required);
169 result = filemap_nopage(area, address, type);
170 if (!result || result == NOPAGE_OOM)
173 if (alloc_required) {
174 error = alloc_page_backing(ip, result);
176 page_cache_release(result);
180 set_page_dirty(result);
183 pfault_be_greedy(ip);
186 gfs2_glock_dq_uninit(&i_gh);
191 struct vm_operations_struct gfs2_vm_ops_private = {
192 .nopage = gfs2_private_nopage,
195 struct vm_operations_struct gfs2_vm_ops_sharewrite = {
196 .nopage = gfs2_sharewrite_nopage,