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
;
41 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
44 if (!test_bit(GIF_PAGED
, &ip
->i_flags
))
47 inode
= gfs2_ip2v_lookup(ip
);
49 unmap_shared_mapping_range(inode
->i_mapping
, 0, 0);
52 if (test_bit(GIF_SW_PAGED
, &ip
->i_flags
))
53 set_bit(GLF_DIRTY
, &gl
->gl_flags
);
56 clear_bit(GIF_SW_PAGED
, &ip
->i_flags
);
60 * gfs2_page_inval - Invalidate all pages associated with a glock
65 void gfs2_page_inval(struct gfs2_glock
*gl
)
67 struct gfs2_inode
*ip
;
71 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
74 inode
= gfs2_ip2v_lookup(ip
);
76 struct address_space
*mapping
= inode
->i_mapping
;
78 truncate_inode_pages(mapping
, 0);
79 gfs2_assert_withdraw(ip
->i_sbd
, !mapping
->nrpages
);
84 clear_bit(GIF_PAGED
, &ip
->i_flags
);
88 * gfs2_page_sync - Sync the data pages (not metadata) associated with a glock
90 * @flags: DIO_START | DIO_WAIT
92 * Syncs data (not metadata) for a regular file.
93 * No-op for all other types.
96 void gfs2_page_sync(struct gfs2_glock
*gl
, int flags
)
98 struct gfs2_inode
*ip
;
102 if (!ip
|| !S_ISREG(ip
->i_di
.di_mode
))
105 inode
= gfs2_ip2v_lookup(ip
);
107 struct address_space
*mapping
= inode
->i_mapping
;
110 if (flags
& DIO_START
)
111 filemap_fdatawrite(mapping
);
112 if (!error
&& (flags
& DIO_WAIT
))
113 error
= filemap_fdatawait(mapping
);
115 /* Put back any errors cleared by filemap_fdatawait()
116 so they can be caught by someone who can pass them
119 if (error
== -ENOSPC
)
120 set_bit(AS_ENOSPC
, &mapping
->flags
);
122 set_bit(AS_EIO
, &mapping
->flags
);
129 * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
131 * @dibh: the dinode buffer
132 * @block: the block number that was allocated
133 * @private: any locked page held by the caller process
138 int gfs2_unstuffer_page(struct gfs2_inode
*ip
, struct buffer_head
*dibh
,
139 uint64_t block
, void *private)
141 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
142 struct inode
*inode
= ip
->i_vnode
;
143 struct page
*page
= (struct page
*)private;
144 struct buffer_head
*bh
;
147 if (!page
|| page
->index
) {
148 page
= grab_cache_page(inode
->i_mapping
, 0);
154 if (!PageUptodate(page
)) {
155 void *kaddr
= kmap(page
);
157 memcpy(kaddr
, dibh
->b_data
+ sizeof(struct gfs2_dinode
),
159 memset(kaddr
+ ip
->i_di
.di_size
, 0,
160 PAGE_CACHE_SIZE
- ip
->i_di
.di_size
);
163 SetPageUptodate(page
);
166 if (!page_has_buffers(page
))
167 create_empty_buffers(page
, 1 << inode
->i_blkbits
,
170 bh
= page_buffers(page
);
172 if (!buffer_mapped(bh
))
173 map_bh(bh
, inode
->i_sb
, block
);
175 set_buffer_uptodate(bh
);
176 if ((sdp
->sd_args
.ar_data
== GFS2_DATA_ORDERED
) || gfs2_is_jdata(ip
))
177 gfs2_trans_add_bh(ip
->i_gl
, bh
, 0);
178 mark_buffer_dirty(bh
);
182 page_cache_release(page
);
189 * gfs2_block_truncate_page - Deal with zeroing out data for truncate
191 * This is partly borrowed from ext3.
193 int gfs2_block_truncate_page(struct address_space
*mapping
)
195 struct inode
*inode
= mapping
->host
;
196 struct gfs2_inode
*ip
= inode
->u
.generic_ip
;
197 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
198 loff_t from
= inode
->i_size
;
199 unsigned long index
= from
>> PAGE_CACHE_SHIFT
;
200 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
201 unsigned blocksize
, iblock
, length
, pos
;
202 struct buffer_head
*bh
;
207 page
= grab_cache_page(mapping
, index
);
211 blocksize
= inode
->i_sb
->s_blocksize
;
212 length
= blocksize
- (offset
& (blocksize
- 1));
213 iblock
= index
<< (PAGE_CACHE_SHIFT
- inode
->i_sb
->s_blocksize_bits
);
215 if (!page_has_buffers(page
))
216 create_empty_buffers(page
, blocksize
, 0);
218 /* Find the buffer that contains "offset" */
219 bh
= page_buffers(page
);
221 while (offset
>= pos
) {
222 bh
= bh
->b_this_page
;
229 if (!buffer_mapped(bh
)) {
230 gfs2_get_block(inode
, iblock
, bh
, 0);
231 /* unmapped? It's a hole - nothing to do */
232 if (!buffer_mapped(bh
))
236 /* Ok, it's mapped. Make sure it's up-to-date */
237 if (PageUptodate(page
))
238 set_buffer_uptodate(bh
);
240 if (!buffer_uptodate(bh
)) {
242 ll_rw_block(READ
, 1, &bh
);
244 /* Uhhuh. Read error. Complain and punt. */
245 if (!buffer_uptodate(bh
))
249 if (sdp
->sd_args
.ar_data
== GFS2_DATA_ORDERED
|| gfs2_is_jdata(ip
))
250 gfs2_trans_add_bh(ip
->i_gl
, bh
, 0);
252 kaddr
= kmap_atomic(page
, KM_USER0
);
253 memset(kaddr
+ offset
, 0, length
);
254 flush_dcache_page(page
);
255 kunmap_atomic(kaddr
, KM_USER0
);
259 page_cache_release(page
);
263 void gfs2_page_add_databufs(struct gfs2_inode
*ip
, struct page
*page
,
264 unsigned int from
, unsigned int to
)
266 struct buffer_head
*head
= page_buffers(page
);
267 unsigned int bsize
= head
->b_size
;
268 struct buffer_head
*bh
;
269 unsigned int start
, end
;
271 for (bh
= head
, start
= 0;
272 bh
!= head
|| !start
;
273 bh
= bh
->b_this_page
, start
= end
) {
275 if (end
<= from
|| start
>= to
)
277 gfs2_trans_add_bh(ip
->i_gl
, bh
, 0);