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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/mm.h>
16#include <linux/pagemap.h>
17#include <linux/writeback.h>
18#include <linux/swap.h>
19#include <linux/delay.h>
20#include <linux/bio.h>
21#include <linux/gfs2_ondisk.h>
22
23#include "gfs2.h"
24#include "incore.h"
25#include "glock.h"
26#include "glops.h"
27#include "inode.h"
28#include "log.h"
29#include "lops.h"
30#include "meta_io.h"
31#include "rgrp.h"
32#include "trans.h"
33#include "util.h"
34
35static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
36{
37 struct buffer_head *bh, *head;
38 int nr_underway = 0;
39 int write_op = REQ_META |
40 (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC_PLUG : WRITE);
41
42 BUG_ON(!PageLocked(page));
43 BUG_ON(!page_has_buffers(page));
44
45 head = page_buffers(page);
46 bh = head;
47
48 do {
49 if (!buffer_mapped(bh))
50 continue;
51
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57
58 if (wbc->sync_mode != WB_SYNC_NONE) {
59 lock_buffer(bh);
60 } else if (!trylock_buffer(bh)) {
61 redirty_page_for_writepage(wbc, page);
62 continue;
63 }
64 if (test_clear_buffer_dirty(bh)) {
65 mark_buffer_async_write(bh);
66 } else {
67 unlock_buffer(bh);
68 }
69 } while ((bh = bh->b_this_page) != head);
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73
74
75 BUG_ON(PageWriteback(page));
76 set_page_writeback(page);
77
78 do {
79 struct buffer_head *next = bh->b_this_page;
80 if (buffer_async_write(bh)) {
81 submit_bh(write_op, bh);
82 nr_underway++;
83 }
84 bh = next;
85 } while (bh != head);
86 unlock_page(page);
87
88 if (nr_underway == 0)
89 end_page_writeback(page);
90
91 return 0;
92}
93
94const struct address_space_operations gfs2_meta_aops = {
95 .writepage = gfs2_aspace_writepage,
96 .releasepage = gfs2_releasepage,
97 .sync_page = block_sync_page,
98};
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105
106void gfs2_meta_sync(struct gfs2_glock *gl)
107{
108 struct address_space *mapping = gfs2_glock2aspace(gl);
109 int error;
110
111 filemap_fdatawrite(mapping);
112 error = filemap_fdatawait(mapping);
113
114 if (error)
115 gfs2_io_error(gl->gl_sbd);
116}
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126
127struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
128{
129 struct address_space *mapping = gfs2_glock2aspace(gl);
130 struct gfs2_sbd *sdp = gl->gl_sbd;
131 struct page *page;
132 struct buffer_head *bh;
133 unsigned int shift;
134 unsigned long index;
135 unsigned int bufnum;
136
137 shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift;
138 index = blkno >> shift;
139 bufnum = blkno - (index << shift);
140
141 if (create) {
142 for (;;) {
143 page = grab_cache_page(mapping, index);
144 if (page)
145 break;
146 yield();
147 }
148 } else {
149 page = find_lock_page(mapping, index);
150 if (!page)
151 return NULL;
152 }
153
154 if (!page_has_buffers(page))
155 create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
156
157
158 for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
159 ;
160 get_bh(bh);
161
162 if (!buffer_mapped(bh))
163 map_bh(bh, sdp->sd_vfs, blkno);
164
165 unlock_page(page);
166 mark_page_accessed(page);
167 page_cache_release(page);
168
169 return bh;
170}
171
172static void meta_prep_new(struct buffer_head *bh)
173{
174 struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
175
176 lock_buffer(bh);
177 clear_buffer_dirty(bh);
178 set_buffer_uptodate(bh);
179 unlock_buffer(bh);
180
181 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
182}
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191
192struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
193{
194 struct buffer_head *bh;
195 bh = gfs2_getbuf(gl, blkno, CREATE);
196 meta_prep_new(bh);
197 return bh;
198}
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209
210int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
211 struct buffer_head **bhp)
212{
213 struct gfs2_sbd *sdp = gl->gl_sbd;
214 struct buffer_head *bh;
215
216 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
217 return -EIO;
218
219 *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
220
221 lock_buffer(bh);
222 if (buffer_uptodate(bh)) {
223 unlock_buffer(bh);
224 return 0;
225 }
226 bh->b_end_io = end_buffer_read_sync;
227 get_bh(bh);
228 submit_bh(READ_SYNC | REQ_META, bh);
229 if (!(flags & DIO_WAIT))
230 return 0;
231
232 wait_on_buffer(bh);
233 if (unlikely(!buffer_uptodate(bh))) {
234 struct gfs2_trans *tr = current->journal_info;
235 if (tr && tr->tr_touched)
236 gfs2_io_error_bh(sdp, bh);
237 brelse(bh);
238 return -EIO;
239 }
240
241 return 0;
242}
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251
252int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
253{
254 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
255 return -EIO;
256
257 wait_on_buffer(bh);
258
259 if (!buffer_uptodate(bh)) {
260 struct gfs2_trans *tr = current->journal_info;
261 if (tr && tr->tr_touched)
262 gfs2_io_error_bh(sdp, bh);
263 return -EIO;
264 }
265 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
266 return -EIO;
267
268 return 0;
269}
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277
278void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
279 int meta)
280{
281 struct gfs2_bufdata *bd;
282
283 if (meta)
284 lock_page(bh->b_page);
285
286 if (bh->b_private) {
287 if (meta)
288 unlock_page(bh->b_page);
289 return;
290 }
291
292 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
293 bd->bd_bh = bh;
294 bd->bd_gl = gl;
295
296 INIT_LIST_HEAD(&bd->bd_list_tr);
297 if (meta)
298 lops_init_le(&bd->bd_le, &gfs2_buf_lops);
299 else
300 lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
301 bh->b_private = bd;
302
303 if (meta)
304 unlock_page(bh->b_page);
305}
306
307void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
308{
309 struct address_space *mapping = bh->b_page->mapping;
310 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
311 struct gfs2_bufdata *bd = bh->b_private;
312
313 if (test_clear_buffer_pinned(bh)) {
314 atomic_dec(&sdp->sd_log_pinned);
315 list_del_init(&bd->bd_le.le_list);
316 if (meta) {
317 gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
318 sdp->sd_log_num_buf--;
319 tr->tr_num_buf_rm++;
320 } else {
321 gfs2_assert_warn(sdp, sdp->sd_log_num_databuf);
322 sdp->sd_log_num_databuf--;
323 tr->tr_num_databuf_rm++;
324 }
325 tr->tr_touched = 1;
326 brelse(bh);
327 }
328 if (bd) {
329 if (bd->bd_ail) {
330 gfs2_remove_from_ail(bd);
331 bh->b_private = NULL;
332 bd->bd_bh = NULL;
333 bd->bd_blkno = bh->b_blocknr;
334 gfs2_trans_add_revoke(sdp, bd);
335 }
336 }
337 clear_buffer_dirty(bh);
338 clear_buffer_uptodate(bh);
339}
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349void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
350{
351 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
352 struct buffer_head *bh;
353
354 while (blen) {
355 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
356 if (bh) {
357 lock_buffer(bh);
358 gfs2_log_lock(sdp);
359 gfs2_remove_from_journal(bh, current->journal_info, 1);
360 gfs2_log_unlock(sdp);
361 unlock_buffer(bh);
362 brelse(bh);
363 }
364
365 bstart++;
366 blen--;
367 }
368}
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381int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
382 int new, struct buffer_head **bhp)
383{
384 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
385 struct gfs2_glock *gl = ip->i_gl;
386 struct buffer_head *bh;
387 int ret = 0;
388
389 if (new) {
390 BUG_ON(height == 0);
391 bh = gfs2_meta_new(gl, num);
392 gfs2_trans_add_bh(ip->i_gl, bh, 1);
393 gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
394 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
395 } else {
396 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
397 ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
398 if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
399 brelse(bh);
400 ret = -EIO;
401 }
402 }
403 *bhp = bh;
404 return ret;
405}
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415
416struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
417{
418 struct gfs2_sbd *sdp = gl->gl_sbd;
419 struct buffer_head *first_bh, *bh;
420 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
421 sdp->sd_sb.sb_bsize_shift;
422
423 BUG_ON(!extlen);
424
425 if (max_ra < 1)
426 max_ra = 1;
427 if (extlen > max_ra)
428 extlen = max_ra;
429
430 first_bh = gfs2_getbuf(gl, dblock, CREATE);
431
432 if (buffer_uptodate(first_bh))
433 goto out;
434 if (!buffer_locked(first_bh))
435 ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
436
437 dblock++;
438 extlen--;
439
440 while (extlen) {
441 bh = gfs2_getbuf(gl, dblock, CREATE);
442
443 if (!buffer_uptodate(bh) && !buffer_locked(bh))
444 ll_rw_block(READA, 1, &bh);
445 brelse(bh);
446 dblock++;
447 extlen--;
448 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
449 goto out;
450 }
451
452 wait_on_buffer(first_bh);
453out:
454 return first_bh;
455}
456
457