pnfsblock: set read/write tk_status to pnfs_error
[linux-2.6/libata-dev.git] / fs / nfs / blocklayout / blocklayout.c
blob06fe080211828e9770acb1d731e5d8bf00d070a9
1 /*
2 * linux/fs/nfs/blocklayout/blocklayout.c
4 * Module for the NFSv4.1 pNFS block layout driver.
6 * Copyright (c) 2006 The Regents of the University of Michigan.
7 * All rights reserved.
9 * Andy Adamson <andros@citi.umich.edu>
10 * Fred Isaman <iisaman@umich.edu>
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.
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.
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>
41 #include "blocklayout.h"
43 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
45 MODULE_LICENSE("GPL");
46 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
47 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
49 struct dentry *bl_device_pipe;
50 wait_queue_head_t bl_wq;
52 static void print_page(struct page *page)
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");
66 /* Given the be associated with isect, determine if page data needs to be
67 * initialized.
69 static int is_hole(struct pnfs_block_extent *be, sector_t isect)
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);
79 /* Given the be associated with isect, determine if page data can be
80 * written to disk.
82 static int is_writable(struct pnfs_block_extent *be, sector_t isect)
84 return (be->be_state == PNFS_BLOCK_READWRITE_DATA ||
85 be->be_state == PNFS_BLOCK_INVALID_DATA);
88 /* The data we are handed might be spread across several bios. We need
89 * to track when the last one is finished.
91 struct parallel_io {
92 struct kref refcnt;
93 struct rpc_call_ops call_ops;
94 void (*pnfs_callback) (void *data);
95 void *data;
98 static inline struct parallel_io *alloc_parallel(void *data)
100 struct parallel_io *rv;
102 rv = kmalloc(sizeof(*rv), GFP_NOFS);
103 if (rv) {
104 rv->data = data;
105 kref_init(&rv->refcnt);
107 return rv;
110 static inline void get_parallel(struct parallel_io *p)
112 kref_get(&p->refcnt);
115 static void destroy_parallel(struct kref *kref)
117 struct parallel_io *p = container_of(kref, struct parallel_io, refcnt);
119 dprintk("%s enter\n", __func__);
120 p->pnfs_callback(p->data);
121 kfree(p);
124 static inline void put_parallel(struct parallel_io *p)
126 kref_put(&p->refcnt, destroy_parallel);
129 static struct bio *
130 bl_submit_bio(int rw, struct bio *bio)
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);
139 return NULL;
142 static 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)
147 struct bio *bio;
149 bio = bio_alloc(GFP_NOIO, npg);
150 if (!bio)
151 return NULL;
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;
160 static 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)
166 retry:
167 if (!bio) {
168 bio = bl_alloc_init_bio(npg, isect, be, end_io, par);
169 if (!bio)
170 return ERR_PTR(-ENOMEM);
172 if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
173 bio = bl_submit_bio(rw, bio);
174 goto retry;
176 return bio;
179 /* This is basically copied from mpage_end_io_read */
180 static void bl_end_io_read(struct bio *bio, int err)
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;
187 do {
188 struct page *page = bvec->bv_page;
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);
200 bio_put(bio);
201 put_parallel(par);
204 static void bl_read_cleanup(struct work_struct *work)
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);
214 static void
215 bl_end_par_io_read(void *data)
217 struct nfs_read_data *rdata = data;
219 rdata->task.tk_status = rdata->pnfs_error;
220 INIT_WORK(&rdata->task.u.tk_work, bl_read_cleanup);
221 schedule_work(&rdata->task.u.tk_work);
224 /* We don't want normal .rpc_call_done callback used, so we replace it
225 * with this stub.
227 static void bl_rpc_do_nothing(struct rpc_task *task, void *calldata)
229 return;
232 static enum pnfs_try_status
233 bl_read_pagelist(struct nfs_read_data *rdata)
235 int i, hole;
236 struct bio *bio = NULL;
237 struct pnfs_block_extent *be = NULL, *cow_read = NULL;
238 sector_t isect, extent_length = 0;
239 struct parallel_io *par;
240 loff_t f_offset = rdata->args.offset;
241 size_t count = rdata->args.count;
242 struct page **pages = rdata->args.pages;
243 int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT;
245 dprintk("%s enter nr_pages %u offset %lld count %Zd\n", __func__,
246 rdata->npages, f_offset, count);
248 par = alloc_parallel(rdata);
249 if (!par)
250 goto use_mds;
251 par->call_ops = *rdata->mds_ops;
252 par->call_ops.rpc_call_done = bl_rpc_do_nothing;
253 par->pnfs_callback = bl_end_par_io_read;
254 /* At this point, we can no longer jump to use_mds */
256 isect = (sector_t) (f_offset >> SECTOR_SHIFT);
257 /* Code assumes extents are page-aligned */
258 for (i = pg_index; i < rdata->npages; i++) {
259 if (!extent_length) {
260 /* We've used up the previous extent */
261 bl_put_extent(be);
262 bl_put_extent(cow_read);
263 bio = bl_submit_bio(READ, bio);
264 /* Get the next one */
265 be = bl_find_get_extent(BLK_LSEG2EXT(rdata->lseg),
266 isect, &cow_read);
267 if (!be) {
268 rdata->pnfs_error = -EIO;
269 goto out;
271 extent_length = be->be_length -
272 (isect - be->be_f_offset);
273 if (cow_read) {
274 sector_t cow_length = cow_read->be_length -
275 (isect - cow_read->be_f_offset);
276 extent_length = min(extent_length, cow_length);
279 hole = is_hole(be, isect);
280 if (hole && !cow_read) {
281 bio = bl_submit_bio(READ, bio);
282 /* Fill hole w/ zeroes w/o accessing device */
283 dprintk("%s Zeroing page for hole\n", __func__);
284 zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
285 print_page(pages[i]);
286 SetPageUptodate(pages[i]);
287 } else {
288 struct pnfs_block_extent *be_read;
290 be_read = (hole && cow_read) ? cow_read : be;
291 bio = bl_add_page_to_bio(bio, rdata->npages - i, READ,
292 isect, pages[i], be_read,
293 bl_end_io_read, par);
294 if (IS_ERR(bio)) {
295 rdata->pnfs_error = PTR_ERR(bio);
296 bio = NULL;
297 goto out;
300 isect += PAGE_CACHE_SECTORS;
301 extent_length -= PAGE_CACHE_SECTORS;
303 if ((isect << SECTOR_SHIFT) >= rdata->inode->i_size) {
304 rdata->res.eof = 1;
305 rdata->res.count = rdata->inode->i_size - f_offset;
306 } else {
307 rdata->res.count = (isect << SECTOR_SHIFT) - f_offset;
309 out:
310 bl_put_extent(be);
311 bl_put_extent(cow_read);
312 bl_submit_bio(READ, bio);
313 put_parallel(par);
314 return PNFS_ATTEMPTED;
316 use_mds:
317 dprintk("Giving up and using normal NFS\n");
318 return PNFS_NOT_ATTEMPTED;
321 static void mark_extents_written(struct pnfs_block_layout *bl,
322 __u64 offset, __u32 count)
324 sector_t isect, end;
325 struct pnfs_block_extent *be;
327 dprintk("%s(%llu, %u)\n", __func__, offset, count);
328 if (count == 0)
329 return;
330 isect = (offset & (long)(PAGE_CACHE_MASK)) >> SECTOR_SHIFT;
331 end = (offset + count + PAGE_CACHE_SIZE - 1) & (long)(PAGE_CACHE_MASK);
332 end >>= SECTOR_SHIFT;
333 while (isect < end) {
334 sector_t len;
335 be = bl_find_get_extent(bl, isect, NULL);
336 BUG_ON(!be); /* FIXME */
337 len = min(end, be->be_f_offset + be->be_length) - isect;
338 if (be->be_state == PNFS_BLOCK_INVALID_DATA)
339 bl_mark_for_commit(be, isect, len); /* What if fails? */
340 isect += len;
341 bl_put_extent(be);
345 static void bl_end_io_write_zero(struct bio *bio, int err)
347 struct parallel_io *par = bio->bi_private;
348 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
349 struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
350 struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
352 do {
353 struct page *page = bvec->bv_page;
355 if (--bvec >= bio->bi_io_vec)
356 prefetchw(&bvec->bv_page->flags);
357 /* This is the zeroing page we added */
358 end_page_writeback(page);
359 page_cache_release(page);
360 } while (bvec >= bio->bi_io_vec);
361 if (!uptodate) {
362 if (!wdata->pnfs_error)
363 wdata->pnfs_error = -EIO;
364 pnfs_set_lo_fail(wdata->lseg);
366 bio_put(bio);
367 put_parallel(par);
370 /* This is basically copied from mpage_end_io_read */
371 static void bl_end_io_write(struct bio *bio, int err)
373 struct parallel_io *par = bio->bi_private;
374 const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
375 struct nfs_write_data *wdata = (struct nfs_write_data *)par->data;
377 if (!uptodate) {
378 if (!wdata->pnfs_error)
379 wdata->pnfs_error = -EIO;
380 pnfs_set_lo_fail(wdata->lseg);
382 bio_put(bio);
383 put_parallel(par);
386 /* Function scheduled for call during bl_end_par_io_write,
387 * it marks sectors as written and extends the commitlist.
389 static void bl_write_cleanup(struct work_struct *work)
391 struct rpc_task *task;
392 struct nfs_write_data *wdata;
393 dprintk("%s enter\n", __func__);
394 task = container_of(work, struct rpc_task, u.tk_work);
395 wdata = container_of(task, struct nfs_write_data, task);
396 if (!wdata->pnfs_error) {
397 /* Marks for LAYOUTCOMMIT */
398 mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
399 wdata->args.offset, wdata->args.count);
401 pnfs_ld_write_done(wdata);
404 /* Called when last of bios associated with a bl_write_pagelist call finishes */
405 static void bl_end_par_io_write(void *data)
407 struct nfs_write_data *wdata = data;
409 wdata->task.tk_status = wdata->pnfs_error;
410 wdata->verf.committed = NFS_FILE_SYNC;
411 INIT_WORK(&wdata->task.u.tk_work, bl_write_cleanup);
412 schedule_work(&wdata->task.u.tk_work);
415 /* FIXME STUB - mark intersection of layout and page as bad, so is not
416 * used again.
418 static void mark_bad_read(void)
420 return;
424 * map_block: map a requested I/0 block (isect) into an offset in the LVM
425 * block_device
427 static void
428 map_block(struct buffer_head *bh, sector_t isect, struct pnfs_block_extent *be)
430 dprintk("%s enter be=%p\n", __func__, be);
432 set_buffer_mapped(bh);
433 bh->b_bdev = be->be_mdev;
434 bh->b_blocknr = (isect - be->be_f_offset + be->be_v_offset) >>
435 (be->be_mdev->bd_inode->i_blkbits - SECTOR_SHIFT);
437 dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n",
438 __func__, (unsigned long long)isect, (long)bh->b_blocknr,
439 bh->b_size);
440 return;
443 /* Given an unmapped page, zero it or read in page for COW, page is locked
444 * by caller.
446 static int
447 init_page_for_write(struct page *page, struct pnfs_block_extent *cow_read)
449 struct buffer_head *bh = NULL;
450 int ret = 0;
451 sector_t isect;
453 dprintk("%s enter, %p\n", __func__, page);
454 BUG_ON(PageUptodate(page));
455 if (!cow_read) {
456 zero_user_segment(page, 0, PAGE_SIZE);
457 SetPageUptodate(page);
458 goto cleanup;
461 bh = alloc_page_buffers(page, PAGE_CACHE_SIZE, 0);
462 if (!bh) {
463 ret = -ENOMEM;
464 goto cleanup;
467 isect = (sector_t) page->index << PAGE_CACHE_SECTOR_SHIFT;
468 map_block(bh, isect, cow_read);
469 if (!bh_uptodate_or_lock(bh))
470 ret = bh_submit_read(bh);
471 if (ret)
472 goto cleanup;
473 SetPageUptodate(page);
475 cleanup:
476 bl_put_extent(cow_read);
477 if (bh)
478 free_buffer_head(bh);
479 if (ret) {
480 /* Need to mark layout with bad read...should now
481 * just use nfs4 for reads and writes.
483 mark_bad_read();
485 return ret;
488 static enum pnfs_try_status
489 bl_write_pagelist(struct nfs_write_data *wdata, int sync)
491 int i, ret, npg_zero, pg_index, last = 0;
492 struct bio *bio = NULL;
493 struct pnfs_block_extent *be = NULL, *cow_read = NULL;
494 sector_t isect, last_isect = 0, extent_length = 0;
495 struct parallel_io *par;
496 loff_t offset = wdata->args.offset;
497 size_t count = wdata->args.count;
498 struct page **pages = wdata->args.pages;
499 struct page *page;
500 pgoff_t index;
501 u64 temp;
502 int npg_per_block =
503 NFS_SERVER(wdata->inode)->pnfs_blksize >> PAGE_CACHE_SHIFT;
505 dprintk("%s enter, %Zu@%lld\n", __func__, count, offset);
506 /* At this point, wdata->pages is a (sequential) list of nfs_pages.
507 * We want to write each, and if there is an error set pnfs_error
508 * to have it redone using nfs.
510 par = alloc_parallel(wdata);
511 if (!par)
512 return PNFS_NOT_ATTEMPTED;
513 par->call_ops = *wdata->mds_ops;
514 par->call_ops.rpc_call_done = bl_rpc_do_nothing;
515 par->pnfs_callback = bl_end_par_io_write;
516 /* At this point, have to be more careful with error handling */
518 isect = (sector_t) ((offset & (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
519 be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg), isect, &cow_read);
520 if (!be || !is_writable(be, isect)) {
521 dprintk("%s no matching extents!\n", __func__);
522 wdata->pnfs_error = -EINVAL;
523 goto out;
526 /* First page inside INVALID extent */
527 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
528 temp = offset >> PAGE_CACHE_SHIFT;
529 npg_zero = do_div(temp, npg_per_block);
530 isect = (sector_t) (((offset - npg_zero * PAGE_CACHE_SIZE) &
531 (long)PAGE_CACHE_MASK) >> SECTOR_SHIFT);
532 extent_length = be->be_length - (isect - be->be_f_offset);
534 fill_invalid_ext:
535 dprintk("%s need to zero %d pages\n", __func__, npg_zero);
536 for (;npg_zero > 0; npg_zero--) {
537 if (bl_is_sector_init(be->be_inval, isect)) {
538 dprintk("isect %llu already init\n",
539 (unsigned long long)isect);
540 goto next_page;
542 /* page ref released in bl_end_io_write_zero */
543 index = isect >> PAGE_CACHE_SECTOR_SHIFT;
544 dprintk("%s zero %dth page: index %lu isect %llu\n",
545 __func__, npg_zero, index,
546 (unsigned long long)isect);
547 page =
548 find_or_create_page(wdata->inode->i_mapping, index,
549 GFP_NOFS);
550 if (!page) {
551 dprintk("%s oom\n", __func__);
552 wdata->pnfs_error = -ENOMEM;
553 goto out;
556 /* PageDirty: Other will write this out
557 * PageWriteback: Other is writing this out
558 * PageUptodate: It was read before
559 * sector_initialized: already written out
561 if (PageDirty(page) || PageWriteback(page)) {
562 print_page(page);
563 unlock_page(page);
564 page_cache_release(page);
565 goto next_page;
567 if (!PageUptodate(page)) {
568 /* New page, readin or zero it */
569 init_page_for_write(page, cow_read);
571 set_page_writeback(page);
572 unlock_page(page);
574 ret = bl_mark_sectors_init(be->be_inval, isect,
575 PAGE_CACHE_SECTORS,
576 NULL);
577 if (unlikely(ret)) {
578 dprintk("%s bl_mark_sectors_init fail %d\n",
579 __func__, ret);
580 end_page_writeback(page);
581 page_cache_release(page);
582 wdata->pnfs_error = ret;
583 goto out;
585 bio = bl_add_page_to_bio(bio, npg_zero, WRITE,
586 isect, page, be,
587 bl_end_io_write_zero, par);
588 if (IS_ERR(bio)) {
589 wdata->pnfs_error = PTR_ERR(bio);
590 bio = NULL;
591 goto out;
593 /* FIXME: This should be done in bi_end_io */
594 mark_extents_written(BLK_LSEG2EXT(wdata->lseg),
595 page->index << PAGE_CACHE_SHIFT,
596 PAGE_CACHE_SIZE);
597 next_page:
598 isect += PAGE_CACHE_SECTORS;
599 extent_length -= PAGE_CACHE_SECTORS;
601 if (last)
602 goto write_done;
604 bio = bl_submit_bio(WRITE, bio);
606 /* Middle pages */
607 pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT;
608 for (i = pg_index; i < wdata->npages; i++) {
609 if (!extent_length) {
610 /* We've used up the previous extent */
611 bl_put_extent(be);
612 bio = bl_submit_bio(WRITE, bio);
613 /* Get the next one */
614 be = bl_find_get_extent(BLK_LSEG2EXT(wdata->lseg),
615 isect, NULL);
616 if (!be || !is_writable(be, isect)) {
617 wdata->pnfs_error = -EINVAL;
618 goto out;
620 extent_length = be->be_length -
621 (isect - be->be_f_offset);
623 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
624 ret = bl_mark_sectors_init(be->be_inval, isect,
625 PAGE_CACHE_SECTORS,
626 NULL);
627 if (unlikely(ret)) {
628 dprintk("%s bl_mark_sectors_init fail %d\n",
629 __func__, ret);
630 wdata->pnfs_error = ret;
631 goto out;
634 bio = bl_add_page_to_bio(bio, wdata->npages - i, WRITE,
635 isect, pages[i], be,
636 bl_end_io_write, par);
637 if (IS_ERR(bio)) {
638 wdata->pnfs_error = PTR_ERR(bio);
639 bio = NULL;
640 goto out;
642 isect += PAGE_CACHE_SECTORS;
643 last_isect = isect;
644 extent_length -= PAGE_CACHE_SECTORS;
647 /* Last page inside INVALID extent */
648 if (be->be_state == PNFS_BLOCK_INVALID_DATA) {
649 bio = bl_submit_bio(WRITE, bio);
650 temp = last_isect >> PAGE_CACHE_SECTOR_SHIFT;
651 npg_zero = npg_per_block - do_div(temp, npg_per_block);
652 if (npg_zero < npg_per_block) {
653 last = 1;
654 goto fill_invalid_ext;
658 write_done:
659 wdata->res.count = (last_isect << SECTOR_SHIFT) - (offset);
660 if (count < wdata->res.count) {
661 wdata->res.count = count;
663 out:
664 bl_put_extent(be);
665 bl_submit_bio(WRITE, bio);
666 put_parallel(par);
667 return PNFS_ATTEMPTED;
670 /* FIXME - range ignored */
671 static void
672 release_extents(struct pnfs_block_layout *bl, struct pnfs_layout_range *range)
674 int i;
675 struct pnfs_block_extent *be;
677 spin_lock(&bl->bl_ext_lock);
678 for (i = 0; i < EXTENT_LISTS; i++) {
679 while (!list_empty(&bl->bl_extents[i])) {
680 be = list_first_entry(&bl->bl_extents[i],
681 struct pnfs_block_extent,
682 be_node);
683 list_del(&be->be_node);
684 bl_put_extent(be);
687 spin_unlock(&bl->bl_ext_lock);
690 static void
691 release_inval_marks(struct pnfs_inval_markings *marks)
693 struct pnfs_inval_tracking *pos, *temp;
695 list_for_each_entry_safe(pos, temp, &marks->im_tree.mtt_stub, it_link) {
696 list_del(&pos->it_link);
697 kfree(pos);
699 return;
702 static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo)
704 struct pnfs_block_layout *bl = BLK_LO2EXT(lo);
706 dprintk("%s enter\n", __func__);
707 release_extents(bl, NULL);
708 release_inval_marks(&bl->bl_inval);
709 kfree(bl);
712 static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode,
713 gfp_t gfp_flags)
715 struct pnfs_block_layout *bl;
717 dprintk("%s enter\n", __func__);
718 bl = kzalloc(sizeof(*bl), gfp_flags);
719 if (!bl)
720 return NULL;
721 spin_lock_init(&bl->bl_ext_lock);
722 INIT_LIST_HEAD(&bl->bl_extents[0]);
723 INIT_LIST_HEAD(&bl->bl_extents[1]);
724 INIT_LIST_HEAD(&bl->bl_commit);
725 INIT_LIST_HEAD(&bl->bl_committing);
726 bl->bl_count = 0;
727 bl->bl_blocksize = NFS_SERVER(inode)->pnfs_blksize >> SECTOR_SHIFT;
728 BL_INIT_INVAL_MARKS(&bl->bl_inval, bl->bl_blocksize);
729 return &bl->bl_layout;
732 static void bl_free_lseg(struct pnfs_layout_segment *lseg)
734 dprintk("%s enter\n", __func__);
735 kfree(lseg);
738 /* We pretty much ignore lseg, and store all data layout wide, so we
739 * can correctly merge.
741 static struct pnfs_layout_segment *bl_alloc_lseg(struct pnfs_layout_hdr *lo,
742 struct nfs4_layoutget_res *lgr,
743 gfp_t gfp_flags)
745 struct pnfs_layout_segment *lseg;
746 int status;
748 dprintk("%s enter\n", __func__);
749 lseg = kzalloc(sizeof(*lseg), gfp_flags);
750 if (!lseg)
751 return ERR_PTR(-ENOMEM);
752 status = nfs4_blk_process_layoutget(lo, lgr, gfp_flags);
753 if (status) {
754 /* We don't want to call the full-blown bl_free_lseg,
755 * since on error extents were not touched.
757 kfree(lseg);
758 return ERR_PTR(status);
760 return lseg;
763 static void
764 bl_encode_layoutcommit(struct pnfs_layout_hdr *lo, struct xdr_stream *xdr,
765 const struct nfs4_layoutcommit_args *arg)
767 dprintk("%s enter\n", __func__);
768 encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo), xdr, arg);
771 static void
772 bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata)
774 struct pnfs_layout_hdr *lo = NFS_I(lcdata->args.inode)->layout;
776 dprintk("%s enter\n", __func__);
777 clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo), &lcdata->args, lcdata->res.status);
780 static void free_blk_mountid(struct block_mount_id *mid)
782 if (mid) {
783 struct pnfs_block_dev *dev;
784 spin_lock(&mid->bm_lock);
785 while (!list_empty(&mid->bm_devlist)) {
786 dev = list_first_entry(&mid->bm_devlist,
787 struct pnfs_block_dev,
788 bm_node);
789 list_del(&dev->bm_node);
790 bl_free_block_dev(dev);
792 spin_unlock(&mid->bm_lock);
793 kfree(mid);
797 /* This is mostly copied from the filelayout's get_device_info function.
798 * It seems much of this should be at the generic pnfs level.
800 static struct pnfs_block_dev *
801 nfs4_blk_get_deviceinfo(struct nfs_server *server, const struct nfs_fh *fh,
802 struct nfs4_deviceid *d_id)
804 struct pnfs_device *dev;
805 struct pnfs_block_dev *rv;
806 u32 max_resp_sz;
807 int max_pages;
808 struct page **pages = NULL;
809 int i, rc;
812 * Use the session max response size as the basis for setting
813 * GETDEVICEINFO's maxcount
815 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
816 max_pages = max_resp_sz >> PAGE_SHIFT;
817 dprintk("%s max_resp_sz %u max_pages %d\n",
818 __func__, max_resp_sz, max_pages);
820 dev = kmalloc(sizeof(*dev), GFP_NOFS);
821 if (!dev) {
822 dprintk("%s kmalloc failed\n", __func__);
823 return ERR_PTR(-ENOMEM);
826 pages = kzalloc(max_pages * sizeof(struct page *), GFP_NOFS);
827 if (pages == NULL) {
828 kfree(dev);
829 return ERR_PTR(-ENOMEM);
831 for (i = 0; i < max_pages; i++) {
832 pages[i] = alloc_page(GFP_NOFS);
833 if (!pages[i]) {
834 rv = ERR_PTR(-ENOMEM);
835 goto out_free;
839 memcpy(&dev->dev_id, d_id, sizeof(*d_id));
840 dev->layout_type = LAYOUT_BLOCK_VOLUME;
841 dev->pages = pages;
842 dev->pgbase = 0;
843 dev->pglen = PAGE_SIZE * max_pages;
844 dev->mincount = 0;
846 dprintk("%s: dev_id: %s\n", __func__, dev->dev_id.data);
847 rc = nfs4_proc_getdeviceinfo(server, dev);
848 dprintk("%s getdevice info returns %d\n", __func__, rc);
849 if (rc) {
850 rv = ERR_PTR(rc);
851 goto out_free;
854 rv = nfs4_blk_decode_device(server, dev);
855 out_free:
856 for (i = 0; i < max_pages; i++)
857 __free_page(pages[i]);
858 kfree(pages);
859 kfree(dev);
860 return rv;
863 static int
864 bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh)
866 struct block_mount_id *b_mt_id = NULL;
867 struct pnfs_devicelist *dlist = NULL;
868 struct pnfs_block_dev *bdev;
869 LIST_HEAD(block_disklist);
870 int status, i;
872 dprintk("%s enter\n", __func__);
874 if (server->pnfs_blksize == 0) {
875 dprintk("%s Server did not return blksize\n", __func__);
876 return -EINVAL;
878 b_mt_id = kzalloc(sizeof(struct block_mount_id), GFP_NOFS);
879 if (!b_mt_id) {
880 status = -ENOMEM;
881 goto out_error;
883 /* Initialize nfs4 block layout mount id */
884 spin_lock_init(&b_mt_id->bm_lock);
885 INIT_LIST_HEAD(&b_mt_id->bm_devlist);
887 dlist = kmalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
888 if (!dlist) {
889 status = -ENOMEM;
890 goto out_error;
892 dlist->eof = 0;
893 while (!dlist->eof) {
894 status = nfs4_proc_getdevicelist(server, fh, dlist);
895 if (status)
896 goto out_error;
897 dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
898 __func__, dlist->num_devs, dlist->eof);
899 for (i = 0; i < dlist->num_devs; i++) {
900 bdev = nfs4_blk_get_deviceinfo(server, fh,
901 &dlist->dev_id[i]);
902 if (IS_ERR(bdev)) {
903 status = PTR_ERR(bdev);
904 goto out_error;
906 spin_lock(&b_mt_id->bm_lock);
907 list_add(&bdev->bm_node, &b_mt_id->bm_devlist);
908 spin_unlock(&b_mt_id->bm_lock);
911 dprintk("%s SUCCESS\n", __func__);
912 server->pnfs_ld_data = b_mt_id;
914 out_return:
915 kfree(dlist);
916 return status;
918 out_error:
919 free_blk_mountid(b_mt_id);
920 goto out_return;
923 static int
924 bl_clear_layoutdriver(struct nfs_server *server)
926 struct block_mount_id *b_mt_id = server->pnfs_ld_data;
928 dprintk("%s enter\n", __func__);
929 free_blk_mountid(b_mt_id);
930 dprintk("%s RETURNS\n", __func__);
931 return 0;
934 static const struct nfs_pageio_ops bl_pg_read_ops = {
935 .pg_init = pnfs_generic_pg_init_read,
936 .pg_test = pnfs_generic_pg_test,
937 .pg_doio = pnfs_generic_pg_readpages,
940 static const struct nfs_pageio_ops bl_pg_write_ops = {
941 .pg_init = pnfs_generic_pg_init_write,
942 .pg_test = pnfs_generic_pg_test,
943 .pg_doio = pnfs_generic_pg_writepages,
946 static struct pnfs_layoutdriver_type blocklayout_type = {
947 .id = LAYOUT_BLOCK_VOLUME,
948 .name = "LAYOUT_BLOCK_VOLUME",
949 .read_pagelist = bl_read_pagelist,
950 .write_pagelist = bl_write_pagelist,
951 .alloc_layout_hdr = bl_alloc_layout_hdr,
952 .free_layout_hdr = bl_free_layout_hdr,
953 .alloc_lseg = bl_alloc_lseg,
954 .free_lseg = bl_free_lseg,
955 .encode_layoutcommit = bl_encode_layoutcommit,
956 .cleanup_layoutcommit = bl_cleanup_layoutcommit,
957 .set_layoutdriver = bl_set_layoutdriver,
958 .clear_layoutdriver = bl_clear_layoutdriver,
959 .pg_read_ops = &bl_pg_read_ops,
960 .pg_write_ops = &bl_pg_write_ops,
963 static const struct rpc_pipe_ops bl_upcall_ops = {
964 .upcall = rpc_pipe_generic_upcall,
965 .downcall = bl_pipe_downcall,
966 .destroy_msg = bl_pipe_destroy_msg,
969 static int __init nfs4blocklayout_init(void)
971 struct vfsmount *mnt;
972 struct path path;
973 int ret;
975 dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
977 ret = pnfs_register_layoutdriver(&blocklayout_type);
978 if (ret)
979 goto out;
981 init_waitqueue_head(&bl_wq);
983 mnt = rpc_get_mount();
984 if (IS_ERR(mnt)) {
985 ret = PTR_ERR(mnt);
986 goto out_remove;
989 ret = vfs_path_lookup(mnt->mnt_root,
990 mnt,
991 NFS_PIPE_DIRNAME, 0, &path);
992 if (ret)
993 goto out_putrpc;
995 bl_device_pipe = rpc_mkpipe(path.dentry, "blocklayout", NULL,
996 &bl_upcall_ops, 0);
997 path_put(&path);
998 if (IS_ERR(bl_device_pipe)) {
999 ret = PTR_ERR(bl_device_pipe);
1000 goto out_putrpc;
1002 out:
1003 return ret;
1005 out_putrpc:
1006 rpc_put_mount();
1007 out_remove:
1008 pnfs_unregister_layoutdriver(&blocklayout_type);
1009 return ret;
1012 static void __exit nfs4blocklayout_exit(void)
1014 dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
1015 __func__);
1017 pnfs_unregister_layoutdriver(&blocklayout_type);
1018 rpc_unlink(bl_device_pipe);
1019 rpc_put_mount();
1022 MODULE_ALIAS("nfs-layouttype4-3");
1024 module_init(nfs4blocklayout_init);
1025 module_exit(nfs4blocklayout_exit);