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-rw-r--r--fs/nfs/blocklayout/blocklayout.c1024
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diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
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1/*
2 * linux/fs/nfs/blocklayout/blocklayout.c
3 *
4 * Module for the NFSv4.1 pNFS block layout driver.
5 *
6 * Copyright (c) 2006 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Andy Adamson <andros@citi.umich.edu>
10 * Fred Isaman <iisaman@umich.edu>
11 *
12 * permission is granted to use, copy, create derivative works and
13 * redistribute this software and such derivative works for any purpose,
14 * so long as the name of the university of michigan is not used in
15 * any advertising or publicity pertaining to the use or distribution
16 * of this software without specific, written prior authorization. if
17 * the above copyright notice or any other identification of the
18 * university of michigan is included in any copy of any portion of
19 * this software, then the disclaimer below must also be included.
20 *
21 * this software is provided as is, without representation from the
22 * university of michigan as to its fitness for any purpose, and without
23 * warranty by the university of michigan of any kind, either express
24 * or implied, including without limitation the implied warranties of
25 * merchantability and fitness for a particular purpose. the regents
26 * of the university of michigan shall not be liable for any damages,
27 * including special, indirect, incidental, or consequential damages,
28 * with respect to any claim arising out or in connection with the use
29 * of the software, even if it has been or is hereafter advised of the
30 * possibility of such damages.
31 */
32
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/bio.h> /* struct bio */
38#include <linux/buffer_head.h> /* various write calls */
39#include <linux/prefetch.h>
40
41#include "blocklayout.h"
42
43#define NFSDBG_FACILITY NFSDBG_PNFS_LD
44
45MODULE_LICENSE("GPL");
46MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
47MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
48
49struct dentry *bl_device_pipe;
50wait_queue_head_t bl_wq;
51
52static void print_page(struct page *page)
53{
54 dprintk("PRINTPAGE page %p\n", page);
55 dprintk(" PagePrivate %d\n", PagePrivate(page));
56 dprintk(" PageUptodate %d\n", PageUptodate(page));
57 dprintk(" PageError %d\n", PageError(page));
58 dprintk(" PageDirty %d\n", PageDirty(page));
59 dprintk(" PageReferenced %d\n", PageReferenced(page));
60 dprintk(" PageLocked %d\n", PageLocked(page));
61 dprintk(" PageWriteback %d\n", PageWriteback(page));
62 dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page));
63 dprintk("\n");
64}
65
66/* Given the be associated with isect, determine if page data needs to be
67 * initialized.
68 */
69static int is_hole(struct pnfs_block_extent *be, sector_t isect)
70{
71 if (be->be_state == PNFS_BLOCK_NONE_DATA)
72 return 1;
73 else if (be->be_state != PNFS_BLOCK_INVALID_DATA)
74 return 0;
75 else
76 return !bl_is_sector_init(be->be_inval, isect);
77}
78
79/* Given the be associated with isect, determine if page data can be
80 * written to disk.
81 */
82static int is_writable(struct pnfs_block_extent *be, sector_t isect)
83{
84 return (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
85 be->be_state == PNFS_BLOCK_INVALID_DATA);
86}
87
88/* The data we are handed might be spread across several bios. We need
89 * to track when the last one is finished.
90 */
91struct parallel_io {
92 struct kref refcnt;
93 struct rpc_call_ops call_ops;
94 void (*pnfs_callback) (void *data);
95 void *data;
96};
97
98static inline struct parallel_io *alloc_parallel(void *data)
99{
100 struct parallel_io *rv;
101
102 rv = kmalloc(sizeof(*rv), GFP_NOFS);
103 if (rv) {
104 rv->data = data;
105 kref_init(&rv->refcnt);
106 }
107 return rv;
108}
109
110static inline void get_parallel(struct parallel_io *p)
111{
112 kref_get(&p->refcnt);
113}
114
115static void destroy_parallel(struct kref *kref)
116{
117 struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
118
119 dprintk("%s enter\n", __func__);
120 p->pnfs_callback(p->data);
121 kfree(p);
122}
123
124static inline void put_parallel(struct parallel_io *p)
125{
126 kref_put(&p->refcnt, destroy_parallel);
127}
128
129static struct bio *
130bl_submit_bio(int rw, struct bio *bio)
131{
132 if (bio) {
133 get_parallel(bio->bi_private);
134 dprintk("%s submitting %s bio %u@%llu\n", __func__,
135 rw == READ ? "read" : "write",
136 bio->bi_size, (unsigned long long)bio->bi_sector);
137 submit_bio(rw, bio);
138 }
139 return NULL;
140}
141
142static struct bio *bl_alloc_init_bio(int npg, sector_t isect,
143 struct pnfs_block_extent *be,
144 void (*end_io)(struct bio *, int err),
145 struct parallel_io *par)
146{
147 struct bio *bio;
148
149 bio = bio_alloc(GFP_NOIO, npg);
150 if (!bio)
151 return NULL;
152
153 bio->bi_sector = isect - be->be_f_offset + be->be_v_offset;
154 bio->bi_bdev = be->be_mdev;
155 bio->bi_end_io = end_io;
156 bio->bi_private = par;
157 return bio;
158}
159
160static struct bio *bl_add_page_to_bio(struct bio *bio, int npg, int rw,
161 sector_t isect, struct page *page,
162 struct pnfs_block_extent *be,
163 void (*end_io)(struct bio *, int err),
164 struct parallel_io *par)
165{
166retry:
167 if (!bio) {
168 bio = bl_alloc_init_bio(npg, isect, be, end_io, par);
169 if (!bio)
170 return ERR_PTR(-ENOMEM);
171 }
172 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
173 bio = bl_submit_bio(rw, bio);
174 goto retry;
175 }
176 return bio;
177}
178
179/* This is basically copied from mpage_end_io_read */
180static void bl_end_io_read(struct bio *bio, int err)
181{
182 struct parallel_io *par = bio->bi_private;
183 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
184 struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
185 struct nfs_read_data *rdata = (struct nfs_read_data *)par->data;
186
187 do {
188 struct page *page = bvec->bv_page;
189
190 if (--bvec >= bio->bi_io_vec)
191 prefetchw(&bvec->bv_page->flags);
192 if (uptodate)
193 SetPageUptodate(page);
194 } while (bvec >= bio->bi_io_vec);
195 if (!uptodate) {
196 if (!rdata->pnfs_error)
197 rdata->pnfs_error = -EIO;
198 pnfs_set_lo_fail(rdata->lseg);
199 }
200 bio_put(bio);
201 put_parallel(par);
202}
203
204static void bl_read_cleanup(struct work_struct *work)
205{
206 struct rpc_task *task;
207 struct nfs_read_data *rdata;
208 dprintk("%s enter\n", __func__);
209 task = container_of(work, struct rpc_task, u.tk_work);
210 rdata = container_of(task, struct nfs_read_data, task);
211 pnfs_ld_read_done(rdata);
212}
213
214static void
215bl_end_par_io_read(void *data)
216{
217 struct nfs_read_data *rdata = data;
218
219 INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup);
220 schedule_work(&rdata->task.u.tk_work);
221}
222
223/* We don't want normal .rpc_call_done callback used, so we replace it
224 * with this stub.
225 */
226static void bl_rpc_do_nothing(struct rpc_task *task, void *calldata)
227{
228 return;
229}
230
231static enum pnfs_try_status
232bl_read_pagelist(struct nfs_read_data *rdata)
233{
234 int i, hole;
235 struct bio *bio = NULL;
236 struct pnfs_block_extent *be = NULL, *cow_read = NULL;
237 sector_t isect, extent_length = 0;
238 struct parallel_io *par;
239 loff_t f_offset = rdata->args.offset;
240 size_t count = rdata->args.count;
241 struct page **pages = rdata->args.pages;
242 int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT;
243
244 dprintk("%s enter nr_pages %u offset %lld count %Zd\n", __func__,
245 rdata->npages, f_offset, count);
246
247 par = alloc_parallel(rdata);
248 if (!par)
249 goto use_mds;
250 par->call_ops = *rdata->mds_ops;
251 par->call_ops.rpc_call_done = bl_rpc_do_nothing;
252 par->pnfs_callback = bl_end_par_io_read;
253 /* At this point, we can no longer jump to use_mds */
254
255 isect = (sector_t) (f_offset >> SECTOR_SHIFT);
256 /* Code assumes extents are page-aligned */
257 for (i = pg_index; i < rdata->npages; i++) {
258 if (!extent_length) {
259 /* We've used up the previous extent */
260 bl_put_extent(be);
261 bl_put_extent(cow_read);
262 bio = bl_submit_bio(READ, bio);
263 /* Get the next one */
264 be = bl_find_get_extent(BLK_LSEG2EXT(rdata->lseg),
265 isect, &cow_read);
266 if (!be) {
267 rdata->pnfs_error = -EIO;
268 goto out;
269 }
270 extent_length = be->be_length -
271 (isect - be->be_f_offset);
272 if (cow_read) {
273 sector_t cow_length = cow_read->be_length -
274 (isect - cow_read->be_f_offset);
275 extent_length = min(extent_length, cow_length);
276 }
277 }
278 hole = is_hole(be, isect);
279 if (hole && !cow_read) {
280 bio = bl_submit_bio(READ, bio);
281 /* Fill hole w/ zeroes w/o accessing device */
282 dprintk("%s Zeroing page for hole\n", __func__);
283 zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
284 print_page(pages[i]);
285 SetPageUptodate(pages[i]);
286 } else {
287 struct pnfs_block_extent *be_read;
288
289 be_read = (hole && cow_read) ? cow_read : be;
290 bio = bl_add_page_to_bio(bio, rdata->npages - i, READ,
291 isect, pages[i], be_read,
292 bl_end_io_read, par);
293 if (IS_ERR(bio)) {
294 rdata->pnfs_error = PTR_ERR(bio);
295 bio = NULL;
296 goto out;
297 }
298 }
299 isect += PAGE_CACHE_SECTORS;
300 extent_length -= PAGE_CACHE_SECTORS;
301 }
302 if ((isect << SECTOR_SHIFT) >= rdata->inode->i_size) {
303 rdata->res.eof = 1;
304 rdata->res.count = rdata->inode->i_size - f_offset;
305 } else {
306 rdata->res.count = (isect << SECTOR_SHIFT) - f_offset;
307 }
308out:
309 bl_put_extent(be);
310 bl_put_extent(cow_read);
311 bl_submit_bio(READ, bio);
312 put_parallel(par);
313 return PNFS_ATTEMPTED;
314
315 use_mds:
316 dprintk("Giving up and using normal NFS\n");
317 return PNFS_NOT_ATTEMPTED;
318}
319
320static void mark_extents_written(struct pnfs_block_layout *bl,
321 __u64 offset, __u32 count)
322{
323 sector_t isect, end;
324 struct pnfs_block_extent *be;
325
326 dprintk("%s(%llu, %u)\n", __func__, offset, count);
327 if (count == 0)
328 return;
329 isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT;
330 end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK);
331 end >>= SECTOR_SHIFT;
332 while (isect < end) {
333 sector_t len;
334 be = bl_find_get_extent(bl, isect, NULL);
335 BUG_ON(!be); /* FIXME */
336 len = min(end, be->be_f_offset + be->be_length) - isect;
337 if (be->be_state == PNFS_BLOCK_INVALID_DATA)
338 bl_mark_for_commit(be, isect, len); /* What if fails? */
339 isect += len;
340 bl_put_extent(be);
341 }
342}
343
344static void bl_end_io_write_zero(struct bio *bio, int err)
345{
346 struct parallel_io *par = bio->bi_private;
347 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
348 struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
349 struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
350
351 do {
352 struct page *page = bvec->bv_page;
353
354 if (--bvec >= bio->bi_io_vec)
355 prefetchw(&bvec->bv_page->flags);
356 /* This is the zeroing page we added */
357 end_page_writeback(page);
358 page_cache_release(page);
359 } while (bvec >= bio->bi_io_vec);
360 if (!uptodate) {
361 if (!wdata->pnfs_error)
362 wdata->pnfs_error = -EIO;
363 pnfs_set_lo_fail(wdata->lseg);
364 }
365 bio_put(bio);
366 put_parallel(par);
367}
368
369/* This is basically copied from mpage_end_io_read */
370static void bl_end_io_write(struct bio *bio, int err)
371{
372 struct parallel_io *par = bio->bi_private;
373 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
374 struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
375
376 if (!uptodate) {
377 if (!wdata->pnfs_error)
378 wdata->pnfs_error = -EIO;
379 pnfs_set_lo_fail(wdata->lseg);
380 }
381 bio_put(bio);
382 put_parallel(par);
383}
384
385/* Function scheduled for call during bl_end_par_io_write,
386 * it marks sectors as written and extends the commitlist.
387 */
388static void bl_write_cleanup(struct work_struct *work)
389{
390 struct rpc_task *task;
391 struct nfs_write_data *wdata;
392 dprintk("%s enter\n", __func__);
393 task = container_of(work, struct rpc_task, u.tk_work);
394 wdata = container_of(task, struct nfs_write_data, task);
395 if (!wdata->pnfs_error) {
396 /* Marks for LAYOUTCOMMIT */
397 mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
398 wdata->args.offset, wdata->args.count);
399 }
400 pnfs_ld_write_done(wdata);
401}
402
403/* Called when last of bios associated with a bl_write_pagelist call finishes */
404static void bl_end_par_io_write(void *data)
405{
406 struct nfs_write_data *wdata = data;
407
408 wdata->task.tk_status = 0;
409 wdata->verf.committed = NFS_FILE_SYNC;
410 INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
411 schedule_work(&wdata->task.u.tk_work);
412}
413
414/* FIXME STUB - mark intersection of layout and page as bad, so is not
415 * used again.
416 */
417static void mark_bad_read(void)
418{
419 return;
420}
421
422/*
423 * map_block: map a requested I/0 block (isect) into an offset in the LVM
424 * block_device
425 */
426static void
427map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be)
428{
429 dprintk("%s enter be=%p\n", __func__, be);
430
431 set_buffer_mapped(bh);
432 bh->b_bdev = be->be_mdev;
433 bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >>
434 (be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT);
435
436 dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n",
437 __func__, (unsigned long long)isect, (long)bh->b_blocknr,
438 bh->b_size);
439 return;
440}
441
442/* Given an unmapped page, zero it or read in page for COW, page is locked
443 * by caller.
444 */
445static int
446init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read)
447{
448 struct buffer_head *bh = NULL;
449 int ret = 0;
450 sector_t isect;
451
452 dprintk("%s enter, %p\n", __func__, page);
453 BUG_ON(PageUptodate(page));
454 if (!cow_read) {
455 zero_user_segment(page, 0, PAGE_SIZE);
456 SetPageUptodate(page);
457 goto cleanup;
458 }
459
460 bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0);
461 if (!bh) {
462 ret = -ENOMEM;
463 goto cleanup;
464 }
465
466 isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT;
467 map_block(bh, isect, cow_read);
468 if (!bh_uptodate_or_lock(bh))
469 ret = bh_submit_read(bh);
470 if (ret)
471 goto cleanup;
472 SetPageUptodate(page);
473
474cleanup:
475 bl_put_extent(cow_read);
476 if (bh)
477 free_buffer_head(bh);
478 if (ret) {
479 /* Need to mark layout with bad read...should now
480 * just use nfs4 for reads and writes.
481 */
482 mark_bad_read();
483 }
484 return ret;
485}
486
487static enum pnfs_try_status
488bl_write_pagelist(struct nfs_write_data *wdata, int sync)
489{
490 int i, ret, npg_zero, pg_index, last = 0;
491 struct bio *bio = NULL;
492 struct pnfs_block_extent *be = NULL, *cow_read = NULL;
493 sector_t isect, last_isect = 0, extent_length = 0;
494 struct parallel_io *par;
495 loff_t offset = wdata->args.offset;
496 size_t count = wdata->args.count;
497 struct page **pages = wdata->args.pages;
498 struct page *page;
499 pgoff_t index;
500 u64 temp;
501 int npg_per_block =
502 NFS_SERVER(wdata->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT;
503
504 dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
505 /* At this point, wdata->pages is a (sequential) list of nfs_pages.
506 * We want to write each, and if there is an error set pnfs_error
507 * to have it redone using nfs.
508 */
509 par = alloc_parallel(wdata);
510 if (!par)
511 return PNFS_NOT_ATTEMPTED;
512 par->call_ops = *wdata->mds_ops;
513 par->call_ops.rpc_call_done = bl_rpc_do_nothing;
514 par->pnfs_callback = bl_end_par_io_write;
515 /* At this point, have to be more careful with error handling */
516
517 isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
518 be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg), isect, &cow_read);
519 if (!be || !is_writable(be, isect)) {
520 dprintk("%s no matching extents!\n", __func__);
521 wdata->pnfs_error = -EINVAL;
522 goto out;
523 }
524
525 /* First page inside INVALID extent */
526 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
527 temp = offset >> PAGE_CACHE_SHIFT;
528 npg_zero = do_div(temp, npg_per_block);
529 isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) &
530 (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
531 extent_length = be->be_length - (isect - be->be_f_offset);
532
533fill_invalid_ext:
534 dprintk("%s need to zero %d pages\n", __func__, npg_zero);
535 for (;npg_zero > 0; npg_zero--) {
536 if (bl_is_sector_init(be->be_inval, isect)) {
537 dprintk("isect %llu already init\n",
538 (unsigned long long)isect);
539 goto next_page;
540 }
541 /* page ref released in bl_end_io_write_zero */
542 index = isect >> PAGE_CACHE_SECTOR_SHIFT;
543 dprintk("%s zero %dth page: index %lu isect %llu\n",
544 __func__, npg_zero, index,
545 (unsigned long long)isect);
546 page =
547 find_or_create_page(wdata->inode->i_mapping, index,
548 GFP_NOFS);
549 if (!page) {
550 dprintk("%s oom\n", __func__);
551 wdata->pnfs_error = -ENOMEM;
552 goto out;
553 }
554
555 /* PageDirty: Other will write this out
556 * PageWriteback: Other is writing this out
557 * PageUptodate: It was read before
558 * sector_initialized: already written out
559 */
560 if (PageDirty(page) || PageWriteback(page)) {
561 print_page(page);
562 unlock_page(page);
563 page_cache_release(page);
564 goto next_page;
565 }
566 if (!PageUptodate(page)) {
567 /* New page, readin or zero it */
568 init_page_for_write(page, cow_read);
569 }
570 set_page_writeback(page);
571 unlock_page(page);
572
573 ret = bl_mark_sectors_init(be->be_inval, isect,
574 PAGE_CACHE_SECTORS,
575 NULL);
576 if (unlikely(ret)) {
577 dprintk("%s bl_mark_sectors_init fail %d\n",
578 __func__, ret);
579 end_page_writeback(page);
580 page_cache_release(page);
581 wdata->pnfs_error = ret;
582 goto out;
583 }
584 bio = bl_add_page_to_bio(bio, npg_zero, WRITE,
585 isect, page, be,
586 bl_end_io_write_zero, par);
587 if (IS_ERR(bio)) {
588 wdata->pnfs_error = PTR_ERR(bio);
589 bio = NULL;
590 goto out;
591 }
592 /* FIXME: This should be done in bi_end_io */
593 mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
594 page->index << PAGE_CACHE_SHIFT,
595 PAGE_CACHE_SIZE);
596next_page:
597 isect += PAGE_CACHE_SECTORS;
598 extent_length -= PAGE_CACHE_SECTORS;
599 }
600 if (last)
601 goto write_done;
602 }
603 bio = bl_submit_bio(WRITE, bio);
604
605 /* Middle pages */
606 pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT;
607 for (i = pg_index; i < wdata->npages; i++) {
608 if (!extent_length) {
609 /* We've used up the previous extent */
610 bl_put_extent(be);
611 bio = bl_submit_bio(WRITE, bio);
612 /* Get the next one */
613 be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg),
614 isect, NULL);
615 if (!be || !is_writable(be, isect)) {
616 wdata->pnfs_error = -EINVAL;
617 goto out;
618 }
619 extent_length = be->be_length -
620 (isect - be->be_f_offset);
621 }
622 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
623 ret = bl_mark_sectors_init(be->be_inval, isect,
624 PAGE_CACHE_SECTORS,
625 NULL);
626 if (unlikely(ret)) {
627 dprintk("%s bl_mark_sectors_init fail %d\n",
628 __func__, ret);
629 wdata->pnfs_error = ret;
630 goto out;
631 }
632 }
633 bio = bl_add_page_to_bio(bio, wdata->npages - i, WRITE,
634 isect, pages[i], be,
635 bl_end_io_write, par);
636 if (IS_ERR(bio)) {
637 wdata->pnfs_error = PTR_ERR(bio);
638 bio = NULL;
639 goto out;
640 }
641 isect += PAGE_CACHE_SECTORS;
642 last_isect = isect;
643 extent_length -= PAGE_CACHE_SECTORS;
644 }
645
646 /* Last page inside INVALID extent */
647 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
648 bio = bl_submit_bio(WRITE, bio);
649 temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT;
650 npg_zero = npg_per_block - do_div(temp, npg_per_block);
651 if (npg_zero < npg_per_block) {
652 last = 1;
653 goto fill_invalid_ext;
654 }
655 }
656
657write_done:
658 wdata->res.count = (last_isect << SECTOR_SHIFT) - (offset);
659 if (count < wdata->res.count) {
660 wdata->res.count = count;
661 }
662out:
663 bl_put_extent(be);
664 bl_submit_bio(WRITE, bio);
665 put_parallel(par);
666 return PNFS_ATTEMPTED;
667}
668
669/* FIXME - range ignored */
670static void
671release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
672{
673 int i;
674 struct pnfs_block_extent *be;
675
676 spin_lock(&bl->bl_ext_lock);
677 for (i = 0; i < EXTENT_LISTS; i++) {
678 while (!list_empty(&bl->bl_extents[i])) {
679 be = list_first_entry(&bl->bl_extents[i],
680 struct pnfs_block_extent,
681 be_node);
682 list_del(&be->be_node);
683 bl_put_extent(be);
684 }
685 }
686 spin_unlock(&bl->bl_ext_lock);
687}
688
689static void
690release_inval_marks(struct pnfs_inval_markings *marks)
691{
692 struct pnfs_inval_tracking *pos, *temp;
693
694 list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) {
695 list_del(&pos->it_link);
696 kfree(pos);
697 }
698 return;
699}
700
701static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
702{
703 struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
704
705 dprintk("%s enter\n", __func__);
706 release_extents(bl, NULL);
707 release_inval_marks(&bl->bl_inval);
708 kfree(bl);
709}
710
711static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
712 gfp_t gfp_flags)
713{
714 struct pnfs_block_layout *bl;
715
716 dprintk("%s enter\n", __func__);
717 bl = kzalloc(sizeof(*bl), gfp_flags);
718 if (!bl)
719 return NULL;
720 spin_lock_init(&bl->bl_ext_lock);
721 INIT_LIST_HEAD(&bl->bl_extents[0]);
722 INIT_LIST_HEAD(&bl->bl_extents[1]);
723 INIT_LIST_HEAD(&bl->bl_commit);
724 INIT_LIST_HEAD(&bl->bl_committing);
725 bl->bl_count = 0;
726 bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT;
727 BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize);
728 return &bl->bl_layout;
729}
730
731static void bl_free_lseg(struct pnfs_layout_segment *lseg)
732{
733 dprintk("%s enter\n", __func__);
734 kfree(lseg);
735}
736
737/* We pretty much ignore lseg, and store all data layout wide, so we
738 * can correctly merge.
739 */
740static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
741 struct nfs4_layoutget_res *lgr,
742 gfp_t gfp_flags)
743{
744 struct pnfs_layout_segment *lseg;
745 int status;
746
747 dprintk("%s enter\n", __func__);
748 lseg = kzalloc(sizeof(*lseg), gfp_flags);
749 if (!lseg)
750 return ERR_PTR(-ENOMEM);
751 status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
752 if (status) {
753 /* We don't want to call the full-blown bl_free_lseg,
754 * since on error extents were not touched.
755 */
756 kfree(lseg);
757 return ERR_PTR(status);
758 }
759 return lseg;
760}
761
762static void
763bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
764 const struct nfs4_layoutcommit_args *arg)
765{
766 dprintk("%s enter\n", __func__);
767 encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg);
768}
769
770static void
771bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
772{
773 struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout;
774
775 dprintk("%s enter\n", __func__);
776 clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status);
777}
778
779static void free_blk_mountid(struct block_mount_id *mid)
780{
781 if (mid) {
782 struct pnfs_block_dev *dev;
783 spin_lock(&mid->bm_lock);
784 while (!list_empty(&mid->bm_devlist)) {
785 dev = list_first_entry(&mid->bm_devlist,
786 struct pnfs_block_dev,
787 bm_node);
788 list_del(&dev->bm_node);
789 bl_free_block_dev(dev);
790 }
791 spin_unlock(&mid->bm_lock);
792 kfree(mid);
793 }
794}
795
796/* This is mostly copied from the filelayout's get_device_info function.
797 * It seems much of this should be at the generic pnfs level.
798 */
799static struct pnfs_block_dev *
800nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
801 struct nfs4_deviceid *d_id)
802{
803 struct pnfs_device *dev;
804 struct pnfs_block_dev *rv;
805 u32 max_resp_sz;
806 int max_pages;
807 struct page **pages = NULL;
808 int i, rc;
809
810 /*
811 * Use the session max response size as the basis for setting
812 * GETDEVICEINFO's maxcount
813 */
814 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
815 max_pages = max_resp_sz >> PAGE_SHIFT;
816 dprintk("%s max_resp_sz %u max_pages %d\n",
817 __func__, max_resp_sz, max_pages);
818
819 dev = kmalloc(sizeof(*dev), GFP_NOFS);
820 if (!dev) {
821 dprintk("%s kmalloc failed\n", __func__);
822 return ERR_PTR(-ENOMEM);
823 }
824
825 pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
826 if (pages == NULL) {
827 kfree(dev);
828 return ERR_PTR(-ENOMEM);
829 }
830 for (i = 0; i < max_pages; i++) {
831 pages[i] = alloc_page(GFP_NOFS);
832 if (!pages[i]) {
833 rv = ERR_PTR(-ENOMEM);
834 goto out_free;
835 }
836 }
837
838 memcpy(&dev->dev_id, d_id, sizeof(*d_id));
839 dev->layout_type = LAYOUT_BLOCK_VOLUME;
840 dev->pages = pages;
841 dev->pgbase = 0;
842 dev->pglen = PAGE_SIZE * max_pages;
843 dev->mincount = 0;
844
845 dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
846 rc = nfs4_proc_getdeviceinfo(server, dev);
847 dprintk("%s getdevice info returns %d\n", __func__, rc);
848 if (rc) {
849 rv = ERR_PTR(rc);
850 goto out_free;
851 }
852
853 rv = nfs4_blk_decode_device(server, dev);
854 out_free:
855 for (i = 0; i < max_pages; i++)
856 __free_page(pages[i]);
857 kfree(pages);
858 kfree(dev);
859 return rv;
860}
861
862static int
863bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
864{
865 struct block_mount_id *b_mt_id = NULL;
866 struct pnfs_devicelist *dlist = NULL;
867 struct pnfs_block_dev *bdev;
868 LIST_HEAD(block_disklist);
869 int status, i;
870
871 dprintk("%s enter\n", __func__);
872
873 if (server->pnfs_blksize == 0) {
874 dprintk("%s Server did not return blksize\n", __func__);
875 return -EINVAL;
876 }
877 b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS);
878 if (!b_mt_id) {
879 status = -ENOMEM;
880 goto out_error;
881 }
882 /* Initialize nfs4 block layout mount id */
883 spin_lock_init(&b_mt_id->bm_lock);
884 INIT_LIST_HEAD(&b_mt_id->bm_devlist);
885
886 dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
887 if (!dlist) {
888 status = -ENOMEM;
889 goto out_error;
890 }
891 dlist->eof = 0;
892 while (!dlist->eof) {
893 status = nfs4_proc_getdevicelist(server, fh, dlist);
894 if (status)
895 goto out_error;
896 dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
897 __func__, dlist->num_devs, dlist->eof);
898 for (i = 0; i < dlist->num_devs; i++) {
899 bdev = nfs4_blk_get_deviceinfo(server, fh,
900 &dlist->dev_id[i]);
901 if (IS_ERR(bdev)) {
902 status = PTR_ERR(bdev);
903 goto out_error;
904 }
905 spin_lock(&b_mt_id->bm_lock);
906 list_add(&bdev->bm_node, &b_mt_id->bm_devlist);
907 spin_unlock(&b_mt_id->bm_lock);
908 }
909 }
910 dprintk("%s SUCCESS\n", __func__);
911 server->pnfs_ld_data = b_mt_id;
912
913 out_return:
914 kfree(dlist);
915 return status;
916
917 out_error:
918 free_blk_mountid(b_mt_id);
919 goto out_return;
920}
921
922static int
923bl_clear_layoutdriver(struct nfs_server *server)
924{
925 struct block_mount_id *b_mt_id = server->pnfs_ld_data;
926
927 dprintk("%s enter\n", __func__);
928 free_blk_mountid(b_mt_id);
929 dprintk("%s RETURNS\n", __func__);
930 return 0;
931}
932
933static const struct nfs_pageio_ops bl_pg_read_ops = {
934 .pg_init = pnfs_generic_pg_init_read,
935 .pg_test = pnfs_generic_pg_test,
936 .pg_doio = pnfs_generic_pg_readpages,
937};
938
939static const struct nfs_pageio_ops bl_pg_write_ops = {
940 .pg_init = pnfs_generic_pg_init_write,
941 .pg_test = pnfs_generic_pg_test,
942 .pg_doio = pnfs_generic_pg_writepages,
943};
944
945static struct pnfs_layoutdriver_type blocklayout_type = {
946 .id = LAYOUT_BLOCK_VOLUME,
947 .name = "LAYOUT_BLOCK_VOLUME",
948 .read_pagelist = bl_read_pagelist,
949 .write_pagelist = bl_write_pagelist,
950 .alloc_layout_hdr = bl_alloc_layout_hdr,
951 .free_layout_hdr = bl_free_layout_hdr,
952 .alloc_lseg = bl_alloc_lseg,
953 .free_lseg = bl_free_lseg,
954 .encode_layoutcommit = bl_encode_layoutcommit,
955 .cleanup_layoutcommit = bl_cleanup_layoutcommit,
956 .set_layoutdriver = bl_set_layoutdriver,
957 .clear_layoutdriver = bl_clear_layoutdriver,
958 .pg_read_ops = &bl_pg_read_ops,
959 .pg_write_ops = &bl_pg_write_ops,
960};
961
962static const struct rpc_pipe_ops bl_upcall_ops = {
963 .upcall = rpc_pipe_generic_upcall,
964 .downcall = bl_pipe_downcall,
965 .destroy_msg = bl_pipe_destroy_msg,
966};
967
968static int __init nfs4blocklayout_init(void)
969{
970 struct vfsmount *mnt;
971 struct path path;
972 int ret;
973
974 dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
975
976 ret = pnfs_register_layoutdriver(&blocklayout_type);
977 if (ret)
978 goto out;
979
980 init_waitqueue_head(&bl_wq);
981
982 mnt = rpc_get_mount();
983 if (IS_ERR(mnt)) {
984 ret = PTR_ERR(mnt);
985 goto out_remove;
986 }
987
988 ret = vfs_path_lookup(mnt->mnt_root,
989 mnt,
990 NFS_PIPE_DIRNAME, 0, &path);
991 if (ret)
992 goto out_putrpc;
993
994 bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
995 &bl_upcall_ops, 0);
996 path_put(&path);
997 if (IS_ERR(bl_device_pipe)) {
998 ret = PTR_ERR(bl_device_pipe);
999 goto out_putrpc;
1000 }
1001out:
1002 return ret;
1003
1004out_putrpc:
1005 rpc_put_mount();
1006out_remove:
1007 pnfs_unregister_layoutdriver(&blocklayout_type);
1008 return ret;
1009}
1010
1011static void __exit nfs4blocklayout_exit(void)
1012{
1013 dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
1014 __func__);
1015
1016 pnfs_unregister_layoutdriver(&blocklayout_type);
1017 rpc_unlink(bl_device_pipe);
1018 rpc_put_mount();
1019}
1020
1021MODULE_ALIAS("nfs-layouttype4-3");
1022
1023module_init(nfs4blocklayout_init);
1024module_exit(nfs4blocklayout_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-07-31 18:06:38 -0400