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>
15 #include <linux/pagemap.h>
17 #include <linux/gfs2_ondisk.h>
20 #include "lm_interface.h"
26 #include "ops_address.h"
30 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
35 void gfs2_pte_inval(struct gfs2_glock *gl)
37 struct gfs2_inode *ip;
42 if (!ip || !S_ISREG(ip->i_di.di_mode))
45 if (!test_bit(GIF_PAGED, &ip->i_flags))
48 unmap_shared_mapping_range(inode->i_mapping, 0, 0);
50 if (test_bit(GIF_SW_PAGED, &ip->i_flags))
51 set_bit(GLF_DIRTY, &gl->gl_flags);
53 clear_bit(GIF_SW_PAGED, &ip->i_flags);
57 * gfs2_page_inval - Invalidate all pages associated with a glock
62 void gfs2_page_inval(struct gfs2_glock *gl)
64 struct gfs2_inode *ip;
69 if (!ip || !S_ISREG(ip->i_di.di_mode))
72 truncate_inode_pages(inode->i_mapping, 0);
73 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), !inode->i_mapping->nrpages);
74 clear_bit(GIF_PAGED, &ip->i_flags);
78 * gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
80 * @flags: DIO_START | DIO_WAIT
82 * Syncs data (not metadata) for a regular file.
83 * No-op for all other types.
86 void gfs2_page_sync(struct gfs2_glock *gl, int flags)
88 struct gfs2_inode *ip;
90 struct address_space *mapping;
95 if (!ip || !S_ISREG(ip->i_di.di_mode))
98 mapping = inode->i_mapping;
100 if (flags & DIO_START)
101 filemap_fdatawrite(mapping);
102 if (!error && (flags & DIO_WAIT))
103 error = filemap_fdatawait(mapping);
105 /* Put back any errors cleared by filemap_fdatawait()
106 so they can be caught by someone who can pass them
109 if (error == -ENOSPC)
110 set_bit(AS_ENOSPC, &mapping->flags);
112 set_bit(AS_EIO, &mapping->flags);
117 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
119 * This is partly borrowed from ext3.
121 int gfs2_block_truncate_page(struct address_space *mapping)
123 struct inode *inode = mapping->host;
124 struct gfs2_inode *ip = GFS2_I(inode);
125 struct gfs2_sbd *sdp = GFS2_SB(inode);
126 loff_t from = inode->i_size;
127 unsigned long index = from >> PAGE_CACHE_SHIFT;
128 unsigned offset = from & (PAGE_CACHE_SIZE-1);
129 unsigned blocksize, iblock, length, pos;
130 struct buffer_head *bh;
135 page = grab_cache_page(mapping, index);
139 blocksize = inode->i_sb->s_blocksize;
140 length = blocksize - (offset & (blocksize - 1));
141 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
143 if (!page_has_buffers(page))
144 create_empty_buffers(page, blocksize, 0);
146 /* Find the buffer that contains "offset" */
147 bh = page_buffers(page);
149 while (offset >= pos) {
150 bh = bh->b_this_page;
157 if (!buffer_mapped(bh)) {
158 gfs2_get_block(inode, iblock, bh, 0);
159 /* unmapped? It's a hole - nothing to do */
160 if (!buffer_mapped(bh))
164 /* Ok, it's mapped. Make sure it's up-to-date */
165 if (PageUptodate(page))
166 set_buffer_uptodate(bh);
168 if (!buffer_uptodate(bh)) {
170 ll_rw_block(READ, 1, &bh);
172 /* Uhhuh. Read error. Complain and punt. */
173 if (!buffer_uptodate(bh))
177 if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
178 gfs2_trans_add_bh(ip->i_gl, bh, 0);
180 kaddr = kmap_atomic(page, KM_USER0);
181 memset(kaddr + offset, 0, length);
182 flush_dcache_page(page);
183 kunmap_atomic(kaddr, KM_USER0);
187 page_cache_release(page);
191 void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
192 unsigned int from, unsigned int to)
194 struct buffer_head *head = page_buffers(page);
195 unsigned int bsize = head->b_size;
196 struct buffer_head *bh;
197 unsigned int start, end;
199 for (bh = head, start = 0; bh != head || !start;
200 bh = bh->b_this_page, start = end) {
202 if (end <= from || start >= to)
204 gfs2_trans_add_bh(ip->i_gl, bh, 0);