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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#include "trace_gfs2.h"
35
36static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
37{
38 struct buffer_head *bh, *head;
39 int nr_underway = 0;
40 int write_flags = REQ_META | REQ_PRIO |
41 (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0);
42
43 BUG_ON(!PageLocked(page));
44 BUG_ON(!page_has_buffers(page));
45
46 head = page_buffers(page);
47 bh = head;
48
49 do {
50 if (!buffer_mapped(bh))
51 continue;
52
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58
59 if (wbc->sync_mode != WB_SYNC_NONE) {
60 lock_buffer(bh);
61 } else if (!trylock_buffer(bh)) {
62 redirty_page_for_writepage(wbc, page);
63 continue;
64 }
65 if (test_clear_buffer_dirty(bh)) {
66 mark_buffer_async_write(bh);
67 } else {
68 unlock_buffer(bh);
69 }
70 } while ((bh = bh->b_this_page) != head);
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74
75
76 BUG_ON(PageWriteback(page));
77 set_page_writeback(page);
78
79 do {
80 struct buffer_head *next = bh->b_this_page;
81 if (buffer_async_write(bh)) {
82 submit_bh(REQ_OP_WRITE, write_flags, bh);
83 nr_underway++;
84 }
85 bh = next;
86 } while (bh != head);
87 unlock_page(page);
88
89 if (nr_underway == 0)
90 end_page_writeback(page);
91
92 return 0;
93}
94
95const struct address_space_operations gfs2_meta_aops = {
96 .writepage = gfs2_aspace_writepage,
97 .releasepage = gfs2_releasepage,
98};
99
100const struct address_space_operations gfs2_rgrp_aops = {
101 .writepage = gfs2_aspace_writepage,
102 .releasepage = gfs2_releasepage,
103};
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113
114struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
115{
116 struct address_space *mapping = gfs2_glock2aspace(gl);
117 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
118 struct page *page;
119 struct buffer_head *bh;
120 unsigned int shift;
121 unsigned long index;
122 unsigned int bufnum;
123
124 if (mapping == NULL)
125 mapping = &sdp->sd_aspace;
126
127 shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
128 index = blkno >> shift;
129 bufnum = blkno - (index << shift);
130
131 if (create) {
132 for (;;) {
133 page = grab_cache_page(mapping, index);
134 if (page)
135 break;
136 yield();
137 }
138 } else {
139 page = find_get_page_flags(mapping, index,
140 FGP_LOCK|FGP_ACCESSED);
141 if (!page)
142 return NULL;
143 }
144
145 if (!page_has_buffers(page))
146 create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
147
148
149 for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
150 ;
151 get_bh(bh);
152
153 if (!buffer_mapped(bh))
154 map_bh(bh, sdp->sd_vfs, blkno);
155
156 unlock_page(page);
157 put_page(page);
158
159 return bh;
160}
161
162static void meta_prep_new(struct buffer_head *bh)
163{
164 struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
165
166 lock_buffer(bh);
167 clear_buffer_dirty(bh);
168 set_buffer_uptodate(bh);
169 unlock_buffer(bh);
170
171 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
172}
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181
182struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
183{
184 struct buffer_head *bh;
185 bh = gfs2_getbuf(gl, blkno, CREATE);
186 meta_prep_new(bh);
187 return bh;
188}
189
190static void gfs2_meta_read_endio(struct bio *bio)
191{
192 struct bio_vec *bvec;
193 int i;
194
195 bio_for_each_segment_all(bvec, bio, i) {
196 struct page *page = bvec->bv_page;
197 struct buffer_head *bh = page_buffers(page);
198 unsigned int len = bvec->bv_len;
199
200 while (bh_offset(bh) < bvec->bv_offset)
201 bh = bh->b_this_page;
202 do {
203 struct buffer_head *next = bh->b_this_page;
204 len -= bh->b_size;
205 bh->b_end_io(bh, !bio->bi_error);
206 bh = next;
207 } while (bh && len);
208 }
209 bio_put(bio);
210}
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215
216static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[],
217 int num)
218{
219 while (num > 0) {
220 struct buffer_head *bh = *bhs;
221 struct bio *bio;
222
223 bio = bio_alloc(GFP_NOIO, num);
224 bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
225 bio->bi_bdev = bh->b_bdev;
226 while (num > 0) {
227 bh = *bhs;
228 if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) {
229 BUG_ON(bio->bi_iter.bi_size == 0);
230 break;
231 }
232 bhs++;
233 num--;
234 }
235 bio->bi_end_io = gfs2_meta_read_endio;
236 bio_set_op_attrs(bio, op, op_flags);
237 submit_bio(bio);
238 }
239}
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251int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
252 int rahead, struct buffer_head **bhp)
253{
254 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
255 struct buffer_head *bh, *bhs[2];
256 int num = 0;
257
258 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
259 *bhp = NULL;
260 return -EIO;
261 }
262
263 *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
264
265 lock_buffer(bh);
266 if (buffer_uptodate(bh)) {
267 unlock_buffer(bh);
268 flags &= ~DIO_WAIT;
269 } else {
270 bh->b_end_io = end_buffer_read_sync;
271 get_bh(bh);
272 bhs[num++] = bh;
273 }
274
275 if (rahead) {
276 bh = gfs2_getbuf(gl, blkno + 1, CREATE);
277
278 lock_buffer(bh);
279 if (buffer_uptodate(bh)) {
280 unlock_buffer(bh);
281 brelse(bh);
282 } else {
283 bh->b_end_io = end_buffer_read_sync;
284 bhs[num++] = bh;
285 }
286 }
287
288 gfs2_submit_bhs(REQ_OP_READ, READ_SYNC | REQ_META | REQ_PRIO, bhs, num);
289 if (!(flags & DIO_WAIT))
290 return 0;
291
292 bh = *bhp;
293 wait_on_buffer(bh);
294 if (unlikely(!buffer_uptodate(bh))) {
295 struct gfs2_trans *tr = current->journal_info;
296 if (tr && tr->tr_touched)
297 gfs2_io_error_bh(sdp, bh);
298 brelse(bh);
299 *bhp = NULL;
300 return -EIO;
301 }
302
303 return 0;
304}
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314int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
315{
316 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
317 return -EIO;
318
319 wait_on_buffer(bh);
320
321 if (!buffer_uptodate(bh)) {
322 struct gfs2_trans *tr = current->journal_info;
323 if (tr && tr->tr_touched)
324 gfs2_io_error_bh(sdp, bh);
325 return -EIO;
326 }
327 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
328 return -EIO;
329
330 return 0;
331}
332
333void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
334{
335 struct address_space *mapping = bh->b_page->mapping;
336 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
337 struct gfs2_bufdata *bd = bh->b_private;
338 struct gfs2_trans *tr = current->journal_info;
339 int was_pinned = 0;
340
341 if (test_clear_buffer_pinned(bh)) {
342 trace_gfs2_pin(bd, 0);
343 atomic_dec(&sdp->sd_log_pinned);
344 list_del_init(&bd->bd_list);
345 if (meta == REMOVE_META)
346 tr->tr_num_buf_rm++;
347 else
348 tr->tr_num_databuf_rm++;
349 tr->tr_touched = 1;
350 was_pinned = 1;
351 brelse(bh);
352 }
353 if (bd) {
354 spin_lock(&sdp->sd_ail_lock);
355 if (bd->bd_tr) {
356 gfs2_trans_add_revoke(sdp, bd);
357 } else if (was_pinned) {
358 bh->b_private = NULL;
359 kmem_cache_free(gfs2_bufdata_cachep, bd);
360 }
361 spin_unlock(&sdp->sd_ail_lock);
362 }
363 clear_buffer_dirty(bh);
364 clear_buffer_uptodate(bh);
365}
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375void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
376{
377 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
378 struct buffer_head *bh;
379
380 while (blen) {
381 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
382 if (bh) {
383 lock_buffer(bh);
384 gfs2_log_lock(sdp);
385 gfs2_remove_from_journal(bh, REMOVE_META);
386 gfs2_log_unlock(sdp);
387 unlock_buffer(bh);
388 brelse(bh);
389 }
390
391 bstart++;
392 blen--;
393 }
394}
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406int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
407 struct buffer_head **bhp)
408{
409 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
410 struct gfs2_glock *gl = ip->i_gl;
411 struct buffer_head *bh;
412 int ret = 0;
413 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
414 int rahead = 0;
415
416 if (num == ip->i_no_addr)
417 rahead = ip->i_rahead;
418
419 ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
420 if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
421 brelse(bh);
422 ret = -EIO;
423 }
424 *bhp = bh;
425 return ret;
426}
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436
437struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
438{
439 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
440 struct buffer_head *first_bh, *bh;
441 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
442 sdp->sd_sb.sb_bsize_shift;
443
444 BUG_ON(!extlen);
445
446 if (max_ra < 1)
447 max_ra = 1;
448 if (extlen > max_ra)
449 extlen = max_ra;
450
451 first_bh = gfs2_getbuf(gl, dblock, CREATE);
452
453 if (buffer_uptodate(first_bh))
454 goto out;
455 if (!buffer_locked(first_bh))
456 ll_rw_block(REQ_OP_READ, READ_SYNC | REQ_META, 1, &first_bh);
457
458 dblock++;
459 extlen--;
460
461 while (extlen) {
462 bh = gfs2_getbuf(gl, dblock, CREATE);
463
464 if (!buffer_uptodate(bh) && !buffer_locked(bh))
465 ll_rw_block(REQ_OP_READ, REQ_RAHEAD | REQ_META, 1, &bh);
466 brelse(bh);
467 dblock++;
468 extlen--;
469 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
470 goto out;
471 }
472
473 wait_on_buffer(first_bh);
474out:
475 return first_bh;
476}
477
478