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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
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 version 2.
8 */
9
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;
52 /*
53 * If it's a fully non-blocking write attempt and we cannot
54 * lock the buffer then redirty the page. Note that this can
55 * potentially cause a busy-wait loop from flusher thread and kswapd
56 * activity, but those code paths have their own higher-level
57 * throttling.
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);
71
72 /*
73 * The page and its buffers are protected by PageWriteback(), so we can
74 * drop the bh refcounts early.
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};
99
100const struct address_space_operations gfs2_rgrp_aops = {
101 .writepage = gfs2_aspace_writepage,
102 .releasepage = gfs2_releasepage,
103};
104
105/**
106 * gfs2_getbuf - Get a buffer with a given address space
107 * @gl: the glock
108 * @blkno: the block number (filesystem scope)
109 * @create: 1 if the buffer should be created
110 *
111 * Returns: the buffer
112 */
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; /* convert block to page */
129 bufnum = blkno - (index << shift); /* block buf index within page */
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 /* Locate header for our buffer within our page */
149 for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
150 /* Do nothing */;
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}
173
174/**
175 * gfs2_meta_new - Get a block
176 * @gl: The glock associated with this block
177 * @blkno: The block number
178 *
179 * Returns: The buffer
180 */
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}
211
212/*
213 * Submit several consecutive buffer head I/O requests as a single bio I/O
214 * request. (See submit_bh_wbc.)
215 */
216static void gfs2_submit_bhs(int rw, struct buffer_head *bhs[], int num)
217{
218 struct buffer_head *bh = bhs[0];
219 struct bio *bio;
220 int i;
221
222 if (!num)
223 return;
224
225 bio = bio_alloc(GFP_NOIO, num);
226 bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
227 bio->bi_bdev = bh->b_bdev;
228 for (i = 0; i < num; i++) {
229 bh = bhs[i];
230 bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
231 }
232 bio->bi_end_io = gfs2_meta_read_endio;
233 submit_bio(rw, bio);
234}
235
236/**
237 * gfs2_meta_read - Read a block from disk
238 * @gl: The glock covering the block
239 * @blkno: The block number
240 * @flags: flags
241 * @bhp: the place where the buffer is returned (NULL on failure)
242 *
243 * Returns: errno
244 */
245
246int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
247 int rahead, struct buffer_head **bhp)
248{
249 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
250 struct buffer_head *bh, *bhs[2];
251 int num = 0;
252
253 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
254 *bhp = NULL;
255 return -EIO;
256 }
257
258 *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
259
260 lock_buffer(bh);
261 if (buffer_uptodate(bh)) {
262 unlock_buffer(bh);
263 flags &= ~DIO_WAIT;
264 } else {
265 bh->b_end_io = end_buffer_read_sync;
266 get_bh(bh);
267 bhs[num++] = bh;
268 }
269
270 if (rahead) {
271 bh = gfs2_getbuf(gl, blkno + 1, CREATE);
272
273 lock_buffer(bh);
274 if (buffer_uptodate(bh)) {
275 unlock_buffer(bh);
276 brelse(bh);
277 } else {
278 bh->b_end_io = end_buffer_read_sync;
279 bhs[num++] = bh;
280 }
281 }
282
283 gfs2_submit_bhs(READ_SYNC | REQ_META | REQ_PRIO, bhs, num);
284 if (!(flags & DIO_WAIT))
285 return 0;
286
287 bh = *bhp;
288 wait_on_buffer(bh);
289 if (unlikely(!buffer_uptodate(bh))) {
290 struct gfs2_trans *tr = current->journal_info;
291 if (tr && tr->tr_touched)
292 gfs2_io_error_bh(sdp, bh);
293 brelse(bh);
294 *bhp = NULL;
295 return -EIO;
296 }
297
298 return 0;
299}
300
301/**
302 * gfs2_meta_wait - Reread a block from disk
303 * @sdp: the filesystem
304 * @bh: The block to wait for
305 *
306 * Returns: errno
307 */
308
309int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
310{
311 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
312 return -EIO;
313
314 wait_on_buffer(bh);
315
316 if (!buffer_uptodate(bh)) {
317 struct gfs2_trans *tr = current->journal_info;
318 if (tr && tr->tr_touched)
319 gfs2_io_error_bh(sdp, bh);
320 return -EIO;
321 }
322 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
323 return -EIO;
324
325 return 0;
326}
327
328void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
329{
330 struct address_space *mapping = bh->b_page->mapping;
331 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
332 struct gfs2_bufdata *bd = bh->b_private;
333 int was_pinned = 0;
334
335 if (test_clear_buffer_pinned(bh)) {
336 trace_gfs2_pin(bd, 0);
337 atomic_dec(&sdp->sd_log_pinned);
338 list_del_init(&bd->bd_list);
339 if (meta)
340 tr->tr_num_buf_rm++;
341 else
342 tr->tr_num_databuf_rm++;
343 tr->tr_touched = 1;
344 was_pinned = 1;
345 brelse(bh);
346 }
347 if (bd) {
348 spin_lock(&sdp->sd_ail_lock);
349 if (bd->bd_tr) {
350 gfs2_trans_add_revoke(sdp, bd);
351 } else if (was_pinned) {
352 bh->b_private = NULL;
353 kmem_cache_free(gfs2_bufdata_cachep, bd);
354 }
355 spin_unlock(&sdp->sd_ail_lock);
356 }
357 clear_buffer_dirty(bh);
358 clear_buffer_uptodate(bh);
359}
360
361/**
362 * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
363 * @ip: the inode who owns the buffers
364 * @bstart: the first buffer in the run
365 * @blen: the number of buffers in the run
366 *
367 */
368
369void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
370{
371 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
372 struct buffer_head *bh;
373
374 while (blen) {
375 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
376 if (bh) {
377 lock_buffer(bh);
378 gfs2_log_lock(sdp);
379 gfs2_remove_from_journal(bh, current->journal_info, 1);
380 gfs2_log_unlock(sdp);
381 unlock_buffer(bh);
382 brelse(bh);
383 }
384
385 bstart++;
386 blen--;
387 }
388}
389
390/**
391 * gfs2_meta_indirect_buffer - Get a metadata buffer
392 * @ip: The GFS2 inode
393 * @height: The level of this buf in the metadata (indir addr) tree (if any)
394 * @num: The block number (device relative) of the buffer
395 * @bhp: the buffer is returned here
396 *
397 * Returns: errno
398 */
399
400int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
401 struct buffer_head **bhp)
402{
403 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
404 struct gfs2_glock *gl = ip->i_gl;
405 struct buffer_head *bh;
406 int ret = 0;
407 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
408 int rahead = 0;
409
410 if (num == ip->i_no_addr)
411 rahead = ip->i_rahead;
412
413 ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
414 if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
415 brelse(bh);
416 ret = -EIO;
417 }
418 *bhp = bh;
419 return ret;
420}
421
422/**
423 * gfs2_meta_ra - start readahead on an extent of a file
424 * @gl: the glock the blocks belong to
425 * @dblock: the starting disk block
426 * @extlen: the number of blocks in the extent
427 *
428 * returns: the first buffer in the extent
429 */
430
431struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
432{
433 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
434 struct buffer_head *first_bh, *bh;
435 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
436 sdp->sd_sb.sb_bsize_shift;
437
438 BUG_ON(!extlen);
439
440 if (max_ra < 1)
441 max_ra = 1;
442 if (extlen > max_ra)
443 extlen = max_ra;
444
445 first_bh = gfs2_getbuf(gl, dblock, CREATE);
446
447 if (buffer_uptodate(first_bh))
448 goto out;
449 if (!buffer_locked(first_bh))
450 ll_rw_block(READ_SYNC | REQ_META, 1, &first_bh);
451
452 dblock++;
453 extlen--;
454
455 while (extlen) {
456 bh = gfs2_getbuf(gl, dblock, CREATE);
457
458 if (!buffer_uptodate(bh) && !buffer_locked(bh))
459 ll_rw_block(READA | REQ_META, 1, &bh);
460 brelse(bh);
461 dblock++;
462 extlen--;
463 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
464 goto out;
465 }
466
467 wait_on_buffer(first_bh);
468out:
469 return first_bh;
470}
471
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/mm.h>
13#include <linux/pagemap.h>
14#include <linux/writeback.h>
15#include <linux/swap.h>
16#include <linux/delay.h>
17#include <linux/bio.h>
18#include <linux/gfs2_ondisk.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "glock.h"
23#include "glops.h"
24#include "inode.h"
25#include "log.h"
26#include "lops.h"
27#include "meta_io.h"
28#include "rgrp.h"
29#include "trans.h"
30#include "util.h"
31#include "trace_gfs2.h"
32
33static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
34{
35 struct buffer_head *bh, *head;
36 int nr_underway = 0;
37 int write_flags = REQ_META | REQ_PRIO | wbc_to_write_flags(wbc);
38
39 BUG_ON(!PageLocked(page));
40 BUG_ON(!page_has_buffers(page));
41
42 head = page_buffers(page);
43 bh = head;
44
45 do {
46 if (!buffer_mapped(bh))
47 continue;
48 /*
49 * If it's a fully non-blocking write attempt and we cannot
50 * lock the buffer then redirty the page. Note that this can
51 * potentially cause a busy-wait loop from flusher thread and kswapd
52 * activity, but those code paths have their own higher-level
53 * throttling.
54 */
55 if (wbc->sync_mode != WB_SYNC_NONE) {
56 lock_buffer(bh);
57 } else if (!trylock_buffer(bh)) {
58 redirty_page_for_writepage(wbc, page);
59 continue;
60 }
61 if (test_clear_buffer_dirty(bh)) {
62 mark_buffer_async_write(bh);
63 } else {
64 unlock_buffer(bh);
65 }
66 } while ((bh = bh->b_this_page) != head);
67
68 /*
69 * The page and its buffers are protected by PageWriteback(), so we can
70 * drop the bh refcounts early.
71 */
72 BUG_ON(PageWriteback(page));
73 set_page_writeback(page);
74
75 do {
76 struct buffer_head *next = bh->b_this_page;
77 if (buffer_async_write(bh)) {
78 submit_bh(REQ_OP_WRITE, write_flags, bh);
79 nr_underway++;
80 }
81 bh = next;
82 } while (bh != head);
83 unlock_page(page);
84
85 if (nr_underway == 0)
86 end_page_writeback(page);
87
88 return 0;
89}
90
91const struct address_space_operations gfs2_meta_aops = {
92 .writepage = gfs2_aspace_writepage,
93 .releasepage = gfs2_releasepage,
94};
95
96const struct address_space_operations gfs2_rgrp_aops = {
97 .writepage = gfs2_aspace_writepage,
98 .releasepage = gfs2_releasepage,
99};
100
101/**
102 * gfs2_getbuf - Get a buffer with a given address space
103 * @gl: the glock
104 * @blkno: the block number (filesystem scope)
105 * @create: 1 if the buffer should be created
106 *
107 * Returns: the buffer
108 */
109
110struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
111{
112 struct address_space *mapping = gfs2_glock2aspace(gl);
113 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
114 struct page *page;
115 struct buffer_head *bh;
116 unsigned int shift;
117 unsigned long index;
118 unsigned int bufnum;
119
120 if (mapping == NULL)
121 mapping = &sdp->sd_aspace;
122
123 shift = PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift;
124 index = blkno >> shift; /* convert block to page */
125 bufnum = blkno - (index << shift); /* block buf index within page */
126
127 if (create) {
128 for (;;) {
129 page = grab_cache_page(mapping, index);
130 if (page)
131 break;
132 yield();
133 }
134 } else {
135 page = find_get_page_flags(mapping, index,
136 FGP_LOCK|FGP_ACCESSED);
137 if (!page)
138 return NULL;
139 }
140
141 if (!page_has_buffers(page))
142 create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0);
143
144 /* Locate header for our buffer within our page */
145 for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page)
146 /* Do nothing */;
147 get_bh(bh);
148
149 if (!buffer_mapped(bh))
150 map_bh(bh, sdp->sd_vfs, blkno);
151
152 unlock_page(page);
153 put_page(page);
154
155 return bh;
156}
157
158static void meta_prep_new(struct buffer_head *bh)
159{
160 struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data;
161
162 lock_buffer(bh);
163 clear_buffer_dirty(bh);
164 set_buffer_uptodate(bh);
165 unlock_buffer(bh);
166
167 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
168}
169
170/**
171 * gfs2_meta_new - Get a block
172 * @gl: The glock associated with this block
173 * @blkno: The block number
174 *
175 * Returns: The buffer
176 */
177
178struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
179{
180 struct buffer_head *bh;
181 bh = gfs2_getbuf(gl, blkno, CREATE);
182 meta_prep_new(bh);
183 return bh;
184}
185
186static void gfs2_meta_read_endio(struct bio *bio)
187{
188 struct bio_vec *bvec;
189 struct bvec_iter_all iter_all;
190
191 bio_for_each_segment_all(bvec, bio, iter_all) {
192 struct page *page = bvec->bv_page;
193 struct buffer_head *bh = page_buffers(page);
194 unsigned int len = bvec->bv_len;
195
196 while (bh_offset(bh) < bvec->bv_offset)
197 bh = bh->b_this_page;
198 do {
199 struct buffer_head *next = bh->b_this_page;
200 len -= bh->b_size;
201 bh->b_end_io(bh, !bio->bi_status);
202 bh = next;
203 } while (bh && len);
204 }
205 bio_put(bio);
206}
207
208/*
209 * Submit several consecutive buffer head I/O requests as a single bio I/O
210 * request. (See submit_bh_wbc.)
211 */
212static void gfs2_submit_bhs(int op, int op_flags, struct buffer_head *bhs[],
213 int num)
214{
215 while (num > 0) {
216 struct buffer_head *bh = *bhs;
217 struct bio *bio;
218
219 bio = bio_alloc(GFP_NOIO, num);
220 bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
221 bio_set_dev(bio, bh->b_bdev);
222 while (num > 0) {
223 bh = *bhs;
224 if (!bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh))) {
225 BUG_ON(bio->bi_iter.bi_size == 0);
226 break;
227 }
228 bhs++;
229 num--;
230 }
231 bio->bi_end_io = gfs2_meta_read_endio;
232 bio_set_op_attrs(bio, op, op_flags);
233 submit_bio(bio);
234 }
235}
236
237/**
238 * gfs2_meta_read - Read a block from disk
239 * @gl: The glock covering the block
240 * @blkno: The block number
241 * @flags: flags
242 * @bhp: the place where the buffer is returned (NULL on failure)
243 *
244 * Returns: errno
245 */
246
247int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
248 int rahead, struct buffer_head **bhp)
249{
250 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
251 struct buffer_head *bh, *bhs[2];
252 int num = 0;
253
254 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) {
255 *bhp = NULL;
256 return -EIO;
257 }
258
259 *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
260
261 lock_buffer(bh);
262 if (buffer_uptodate(bh)) {
263 unlock_buffer(bh);
264 flags &= ~DIO_WAIT;
265 } else {
266 bh->b_end_io = end_buffer_read_sync;
267 get_bh(bh);
268 bhs[num++] = bh;
269 }
270
271 if (rahead) {
272 bh = gfs2_getbuf(gl, blkno + 1, CREATE);
273
274 lock_buffer(bh);
275 if (buffer_uptodate(bh)) {
276 unlock_buffer(bh);
277 brelse(bh);
278 } else {
279 bh->b_end_io = end_buffer_read_sync;
280 bhs[num++] = bh;
281 }
282 }
283
284 gfs2_submit_bhs(REQ_OP_READ, REQ_META | REQ_PRIO, bhs, num);
285 if (!(flags & DIO_WAIT))
286 return 0;
287
288 bh = *bhp;
289 wait_on_buffer(bh);
290 if (unlikely(!buffer_uptodate(bh))) {
291 struct gfs2_trans *tr = current->journal_info;
292 if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
293 gfs2_io_error_bh_wd(sdp, bh);
294 brelse(bh);
295 *bhp = NULL;
296 return -EIO;
297 }
298
299 return 0;
300}
301
302/**
303 * gfs2_meta_wait - Reread a block from disk
304 * @sdp: the filesystem
305 * @bh: The block to wait for
306 *
307 * Returns: errno
308 */
309
310int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
311{
312 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)))
313 return -EIO;
314
315 wait_on_buffer(bh);
316
317 if (!buffer_uptodate(bh)) {
318 struct gfs2_trans *tr = current->journal_info;
319 if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
320 gfs2_io_error_bh_wd(sdp, bh);
321 return -EIO;
322 }
323 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)))
324 return -EIO;
325
326 return 0;
327}
328
329void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
330{
331 struct address_space *mapping = bh->b_page->mapping;
332 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
333 struct gfs2_bufdata *bd = bh->b_private;
334 struct gfs2_trans *tr = current->journal_info;
335 int was_pinned = 0;
336
337 if (test_clear_buffer_pinned(bh)) {
338 trace_gfs2_pin(bd, 0);
339 atomic_dec(&sdp->sd_log_pinned);
340 list_del_init(&bd->bd_list);
341 if (meta == REMOVE_META)
342 tr->tr_num_buf_rm++;
343 else
344 tr->tr_num_databuf_rm++;
345 set_bit(TR_TOUCHED, &tr->tr_flags);
346 was_pinned = 1;
347 brelse(bh);
348 }
349 if (bd) {
350 spin_lock(&sdp->sd_ail_lock);
351 if (bd->bd_tr) {
352 gfs2_trans_add_revoke(sdp, bd);
353 } else if (was_pinned) {
354 bh->b_private = NULL;
355 kmem_cache_free(gfs2_bufdata_cachep, bd);
356 }
357 spin_unlock(&sdp->sd_ail_lock);
358 }
359 clear_buffer_dirty(bh);
360 clear_buffer_uptodate(bh);
361}
362
363/**
364 * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
365 * @ip: the inode who owns the buffers
366 * @bstart: the first buffer in the run
367 * @blen: the number of buffers in the run
368 *
369 */
370
371void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
372{
373 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
374 struct buffer_head *bh;
375
376 while (blen) {
377 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
378 if (bh) {
379 lock_buffer(bh);
380 gfs2_log_lock(sdp);
381 gfs2_remove_from_journal(bh, REMOVE_META);
382 gfs2_log_unlock(sdp);
383 unlock_buffer(bh);
384 brelse(bh);
385 }
386
387 bstart++;
388 blen--;
389 }
390}
391
392/**
393 * gfs2_meta_indirect_buffer - Get a metadata buffer
394 * @ip: The GFS2 inode
395 * @height: The level of this buf in the metadata (indir addr) tree (if any)
396 * @num: The block number (device relative) of the buffer
397 * @bhp: the buffer is returned here
398 *
399 * Returns: errno
400 */
401
402int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
403 struct buffer_head **bhp)
404{
405 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
406 struct gfs2_glock *gl = ip->i_gl;
407 struct buffer_head *bh;
408 int ret = 0;
409 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
410 int rahead = 0;
411
412 if (num == ip->i_no_addr)
413 rahead = ip->i_rahead;
414
415 ret = gfs2_meta_read(gl, num, DIO_WAIT, rahead, &bh);
416 if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
417 brelse(bh);
418 ret = -EIO;
419 } else {
420 *bhp = bh;
421 }
422 return ret;
423}
424
425/**
426 * gfs2_meta_ra - start readahead on an extent of a file
427 * @gl: the glock the blocks belong to
428 * @dblock: the starting disk block
429 * @extlen: the number of blocks in the extent
430 *
431 * returns: the first buffer in the extent
432 */
433
434struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
435{
436 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
437 struct buffer_head *first_bh, *bh;
438 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
439 sdp->sd_sb.sb_bsize_shift;
440
441 BUG_ON(!extlen);
442
443 if (max_ra < 1)
444 max_ra = 1;
445 if (extlen > max_ra)
446 extlen = max_ra;
447
448 first_bh = gfs2_getbuf(gl, dblock, CREATE);
449
450 if (buffer_uptodate(first_bh))
451 goto out;
452 if (!buffer_locked(first_bh))
453 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &first_bh);
454
455 dblock++;
456 extlen--;
457
458 while (extlen) {
459 bh = gfs2_getbuf(gl, dblock, CREATE);
460
461 if (!buffer_uptodate(bh) && !buffer_locked(bh))
462 ll_rw_block(REQ_OP_READ,
463 REQ_RAHEAD | REQ_META | REQ_PRIO,
464 1, &bh);
465 brelse(bh);
466 dblock++;
467 extlen--;
468 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
469 goto out;
470 }
471
472 wait_on_buffer(first_bh);
473out:
474 return first_bh;
475}
476