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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_op = REQ_META | REQ_PRIO |
41 (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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;
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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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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(write_op, 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};
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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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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 *bhp = NULL;
218 return -EIO;
219 }
220
221 *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
222
223 lock_buffer(bh);
224 if (buffer_uptodate(bh)) {
225 unlock_buffer(bh);
226 return 0;
227 }
228 bh->b_end_io = end_buffer_read_sync;
229 get_bh(bh);
230 submit_bh(READ_SYNC | REQ_META | REQ_PRIO, bh);
231 if (!(flags & DIO_WAIT))
232 return 0;
233
234 wait_on_buffer(bh);
235 if (unlikely(!buffer_uptodate(bh))) {
236 struct gfs2_trans *tr = current->journal_info;
237 if (tr && tr->tr_touched)
238 gfs2_io_error_bh(sdp, bh);
239 brelse(bh);
240 *bhp = NULL;
241 return -EIO;
242 }
243
244 return 0;
245}
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254
255int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
256{
257 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
258 return -EIO;
259
260 wait_on_buffer(bh);
261
262 if (!buffer_uptodate(bh)) {
263 struct gfs2_trans *tr = current->journal_info;
264 if (tr && tr->tr_touched)
265 gfs2_io_error_bh(sdp, bh);
266 return -EIO;
267 }
268 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
269 return -EIO;
270
271 return 0;
272}
273
274void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
275{
276 struct address_space *mapping = bh->b_page->mapping;
277 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
278 struct gfs2_bufdata *bd = bh->b_private;
279
280 if (test_clear_buffer_pinned(bh)) {
281 trace_gfs2_pin(bd, 0);
282 atomic_dec(&sdp->sd_log_pinned);
283 list_del_init(&bd->bd_list);
284 if (meta) {
285 gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
286 sdp->sd_log_num_buf--;
287 tr->tr_num_buf_rm++;
288 } else {
289 gfs2_assert_warn(sdp, sdp->sd_log_num_databuf);
290 sdp->sd_log_num_databuf--;
291 tr->tr_num_databuf_rm++;
292 }
293 tr->tr_touched = 1;
294 brelse(bh);
295 }
296 if (bd) {
297 spin_lock(&sdp->sd_ail_lock);
298 if (bd->bd_tr) {
299 gfs2_trans_add_revoke(sdp, bd);
300 }
301 spin_unlock(&sdp->sd_ail_lock);
302 }
303 clear_buffer_dirty(bh);
304 clear_buffer_uptodate(bh);
305}
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315void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
316{
317 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
318 struct buffer_head *bh;
319
320 while (blen) {
321 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
322 if (bh) {
323 lock_buffer(bh);
324 gfs2_log_lock(sdp);
325 gfs2_remove_from_journal(bh, current->journal_info, 1);
326 gfs2_log_unlock(sdp);
327 unlock_buffer(bh);
328 brelse(bh);
329 }
330
331 bstart++;
332 blen--;
333 }
334}
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346int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
347 struct buffer_head **bhp)
348{
349 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
350 struct gfs2_glock *gl = ip->i_gl;
351 struct buffer_head *bh;
352 int ret = 0;
353 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
354
355 ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
356 if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
357 brelse(bh);
358 ret = -EIO;
359 }
360 *bhp = bh;
361 return ret;
362}
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372
373struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
374{
375 struct gfs2_sbd *sdp = gl->gl_sbd;
376 struct buffer_head *first_bh, *bh;
377 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
378 sdp->sd_sb.sb_bsize_shift;
379
380 BUG_ON(!extlen);
381
382 if (max_ra < 1)
383 max_ra = 1;
384 if (extlen > max_ra)
385 extlen = max_ra;
386
387 first_bh = gfs2_getbuf(gl, dblock, CREATE);
388
389 if (buffer_uptodate(first_bh))
390 goto out;
391 if (!buffer_locked(first_bh))
392 ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
393
394 dblock++;
395 extlen--;
396
397 while (extlen) {
398 bh = gfs2_getbuf(gl, dblock, CREATE);
399
400 if (!buffer_uptodate(bh) && !buffer_locked(bh))
401 ll_rw_block(READA | REQ_META, 1, &bh);
402 brelse(bh);
403 dblock++;
404 extlen--;
405 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
406 goto out;
407 }
408
409 wait_on_buffer(first_bh);
410out:
411 return first_bh;
412}
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414