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.
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>
40 #include <linux/pagevec.h>
43 #include "../internal.h"
44 #include "blocklayout.h"
46 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
48 MODULE_LICENSE("GPL");
49 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
50 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
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
));
66 /* Given the be associated with isect, determine if page data needs to be
69 static int is_hole(struct pnfs_block_extent
*be
, sector_t isect
)
71 if (be
->be_state
== PNFS_BLOCK_NONE_DATA
)
73 else if (be
->be_state
!= PNFS_BLOCK_INVALID_DATA
)
76 return !bl_is_sector_init(be
->be_inval
, isect
);
79 /* Given the be associated with isect, determine if page data can be
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.
93 void (*pnfs_callback
) (void *data
, int num_se
);
98 static inline struct parallel_io
*alloc_parallel(void *data
)
100 struct parallel_io
*rv
;
102 rv
= kmalloc(sizeof(*rv
), GFP_NOFS
);
105 kref_init(&rv
->refcnt
);
111 static inline void get_parallel(struct parallel_io
*p
)
113 kref_get(&p
->refcnt
);
116 static void destroy_parallel(struct kref
*kref
)
118 struct parallel_io
*p
= container_of(kref
, struct parallel_io
, refcnt
);
120 dprintk("%s enter\n", __func__
);
121 p
->pnfs_callback(p
->data
, p
->bse_count
);
125 static inline void put_parallel(struct parallel_io
*p
)
127 kref_put(&p
->refcnt
, destroy_parallel
);
131 bl_submit_bio(int rw
, struct bio
*bio
)
134 get_parallel(bio
->bi_private
);
135 dprintk("%s submitting %s bio %u@%llu\n", __func__
,
136 rw
== READ
? "read" : "write",
137 bio
->bi_size
, (unsigned long long)bio
->bi_sector
);
143 static struct bio
*bl_alloc_init_bio(int npg
, sector_t isect
,
144 struct pnfs_block_extent
*be
,
145 void (*end_io
)(struct bio
*, int err
),
146 struct parallel_io
*par
)
150 npg
= min(npg
, BIO_MAX_PAGES
);
151 bio
= bio_alloc(GFP_NOIO
, npg
);
152 if (!bio
&& (current
->flags
& PF_MEMALLOC
)) {
153 while (!bio
&& (npg
/= 2))
154 bio
= bio_alloc(GFP_NOIO
, npg
);
158 bio
->bi_sector
= isect
- be
->be_f_offset
+ be
->be_v_offset
;
159 bio
->bi_bdev
= be
->be_mdev
;
160 bio
->bi_end_io
= end_io
;
161 bio
->bi_private
= par
;
166 static struct bio
*do_add_page_to_bio(struct bio
*bio
, int npg
, int rw
,
167 sector_t isect
, struct page
*page
,
168 struct pnfs_block_extent
*be
,
169 void (*end_io
)(struct bio
*, int err
),
170 struct parallel_io
*par
,
171 unsigned int offset
, int len
)
173 isect
= isect
+ (offset
>> SECTOR_SHIFT
);
174 dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__
,
175 npg
, rw
, (unsigned long long)isect
, offset
, len
);
178 bio
= bl_alloc_init_bio(npg
, isect
, be
, end_io
, par
);
180 return ERR_PTR(-ENOMEM
);
182 if (bio_add_page(bio
, page
, len
, offset
) < len
) {
183 bio
= bl_submit_bio(rw
, bio
);
189 static struct bio
*bl_add_page_to_bio(struct bio
*bio
, int npg
, int rw
,
190 sector_t isect
, struct page
*page
,
191 struct pnfs_block_extent
*be
,
192 void (*end_io
)(struct bio
*, int err
),
193 struct parallel_io
*par
)
195 return do_add_page_to_bio(bio
, npg
, rw
, isect
, page
, be
,
196 end_io
, par
, 0, PAGE_CACHE_SIZE
);
199 /* This is basically copied from mpage_end_io_read */
200 static void bl_end_io_read(struct bio
*bio
, int err
)
202 struct parallel_io
*par
= bio
->bi_private
;
203 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
204 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
207 struct page
*page
= bvec
->bv_page
;
209 if (--bvec
>= bio
->bi_io_vec
)
210 prefetchw(&bvec
->bv_page
->flags
);
212 SetPageUptodate(page
);
213 } while (bvec
>= bio
->bi_io_vec
);
215 struct nfs_read_data
*rdata
= par
->data
;
216 struct nfs_pgio_header
*header
= rdata
->header
;
218 if (!header
->pnfs_error
)
219 header
->pnfs_error
= -EIO
;
220 pnfs_set_lo_fail(header
->lseg
);
226 static void bl_read_cleanup(struct work_struct
*work
)
228 struct rpc_task
*task
;
229 struct nfs_read_data
*rdata
;
230 dprintk("%s enter\n", __func__
);
231 task
= container_of(work
, struct rpc_task
, u
.tk_work
);
232 rdata
= container_of(task
, struct nfs_read_data
, task
);
233 pnfs_ld_read_done(rdata
);
237 bl_end_par_io_read(void *data
, int unused
)
239 struct nfs_read_data
*rdata
= data
;
241 rdata
->task
.tk_status
= rdata
->header
->pnfs_error
;
242 INIT_WORK(&rdata
->task
.u
.tk_work
, bl_read_cleanup
);
243 schedule_work(&rdata
->task
.u
.tk_work
);
246 static enum pnfs_try_status
247 bl_read_pagelist(struct nfs_read_data
*rdata
)
249 struct nfs_pgio_header
*header
= rdata
->header
;
251 struct bio
*bio
= NULL
;
252 struct pnfs_block_extent
*be
= NULL
, *cow_read
= NULL
;
253 sector_t isect
, extent_length
= 0;
254 struct parallel_io
*par
;
255 loff_t f_offset
= rdata
->args
.offset
;
256 size_t bytes_left
= rdata
->args
.count
;
257 unsigned int pg_offset
, pg_len
;
258 struct page
**pages
= rdata
->args
.pages
;
259 int pg_index
= rdata
->args
.pgbase
>> PAGE_CACHE_SHIFT
;
260 const bool is_dio
= (header
->dreq
!= NULL
);
262 dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__
,
263 rdata
->pages
.npages
, f_offset
, (unsigned int)rdata
->args
.count
);
265 par
= alloc_parallel(rdata
);
268 par
->pnfs_callback
= bl_end_par_io_read
;
269 /* At this point, we can no longer jump to use_mds */
271 isect
= (sector_t
) (f_offset
>> SECTOR_SHIFT
);
272 /* Code assumes extents are page-aligned */
273 for (i
= pg_index
; i
< rdata
->pages
.npages
; i
++) {
274 if (!extent_length
) {
275 /* We've used up the previous extent */
277 bl_put_extent(cow_read
);
278 bio
= bl_submit_bio(READ
, bio
);
279 /* Get the next one */
280 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
),
283 header
->pnfs_error
= -EIO
;
286 extent_length
= be
->be_length
-
287 (isect
- be
->be_f_offset
);
289 sector_t cow_length
= cow_read
->be_length
-
290 (isect
- cow_read
->be_f_offset
);
291 extent_length
= min(extent_length
, cow_length
);
296 pg_offset
= f_offset
& ~PAGE_CACHE_MASK
;
297 if (pg_offset
+ bytes_left
> PAGE_CACHE_SIZE
)
298 pg_len
= PAGE_CACHE_SIZE
- pg_offset
;
303 bytes_left
-= pg_len
;
304 isect
+= (pg_offset
>> SECTOR_SHIFT
);
307 pg_len
= PAGE_CACHE_SIZE
;
310 hole
= is_hole(be
, isect
);
311 if (hole
&& !cow_read
) {
312 bio
= bl_submit_bio(READ
, bio
);
313 /* Fill hole w/ zeroes w/o accessing device */
314 dprintk("%s Zeroing page for hole\n", __func__
);
315 zero_user_segment(pages
[i
], pg_offset
, pg_len
);
316 print_page(pages
[i
]);
317 SetPageUptodate(pages
[i
]);
319 struct pnfs_block_extent
*be_read
;
321 be_read
= (hole
&& cow_read
) ? cow_read
: be
;
322 bio
= do_add_page_to_bio(bio
, rdata
->pages
.npages
- i
,
324 isect
, pages
[i
], be_read
,
328 header
->pnfs_error
= PTR_ERR(bio
);
333 isect
+= (pg_len
>> SECTOR_SHIFT
);
334 extent_length
-= PAGE_CACHE_SECTORS
;
336 if ((isect
<< SECTOR_SHIFT
) >= header
->inode
->i_size
) {
338 rdata
->res
.count
= header
->inode
->i_size
- rdata
->args
.offset
;
340 rdata
->res
.count
= (isect
<< SECTOR_SHIFT
) - rdata
->args
.offset
;
344 bl_put_extent(cow_read
);
345 bl_submit_bio(READ
, bio
);
347 return PNFS_ATTEMPTED
;
350 dprintk("Giving up and using normal NFS\n");
351 return PNFS_NOT_ATTEMPTED
;
354 static void mark_extents_written(struct pnfs_block_layout
*bl
,
355 __u64 offset
, __u32 count
)
358 struct pnfs_block_extent
*be
;
359 struct pnfs_block_short_extent
*se
;
361 dprintk("%s(%llu, %u)\n", __func__
, offset
, count
);
364 isect
= (offset
& (long)(PAGE_CACHE_MASK
)) >> SECTOR_SHIFT
;
365 end
= (offset
+ count
+ PAGE_CACHE_SIZE
- 1) & (long)(PAGE_CACHE_MASK
);
366 end
>>= SECTOR_SHIFT
;
367 while (isect
< end
) {
369 be
= bl_find_get_extent(bl
, isect
, NULL
);
370 BUG_ON(!be
); /* FIXME */
371 len
= min(end
, be
->be_f_offset
+ be
->be_length
) - isect
;
372 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
373 se
= bl_pop_one_short_extent(be
->be_inval
);
375 bl_mark_for_commit(be
, isect
, len
, se
);
382 static void bl_end_io_write_zero(struct bio
*bio
, int err
)
384 struct parallel_io
*par
= bio
->bi_private
;
385 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
386 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
389 struct page
*page
= bvec
->bv_page
;
391 if (--bvec
>= bio
->bi_io_vec
)
392 prefetchw(&bvec
->bv_page
->flags
);
393 /* This is the zeroing page we added */
394 end_page_writeback(page
);
395 page_cache_release(page
);
396 } while (bvec
>= bio
->bi_io_vec
);
398 if (unlikely(!uptodate
)) {
399 struct nfs_write_data
*data
= par
->data
;
400 struct nfs_pgio_header
*header
= data
->header
;
402 if (!header
->pnfs_error
)
403 header
->pnfs_error
= -EIO
;
404 pnfs_set_lo_fail(header
->lseg
);
410 static void bl_end_io_write(struct bio
*bio
, int err
)
412 struct parallel_io
*par
= bio
->bi_private
;
413 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
414 struct nfs_write_data
*data
= par
->data
;
415 struct nfs_pgio_header
*header
= data
->header
;
418 if (!header
->pnfs_error
)
419 header
->pnfs_error
= -EIO
;
420 pnfs_set_lo_fail(header
->lseg
);
426 /* Function scheduled for call during bl_end_par_io_write,
427 * it marks sectors as written and extends the commitlist.
429 static void bl_write_cleanup(struct work_struct
*work
)
431 struct rpc_task
*task
;
432 struct nfs_write_data
*wdata
;
433 dprintk("%s enter\n", __func__
);
434 task
= container_of(work
, struct rpc_task
, u
.tk_work
);
435 wdata
= container_of(task
, struct nfs_write_data
, task
);
436 if (likely(!wdata
->header
->pnfs_error
)) {
437 /* Marks for LAYOUTCOMMIT */
438 mark_extents_written(BLK_LSEG2EXT(wdata
->header
->lseg
),
439 wdata
->args
.offset
, wdata
->args
.count
);
441 pnfs_ld_write_done(wdata
);
444 /* Called when last of bios associated with a bl_write_pagelist call finishes */
445 static void bl_end_par_io_write(void *data
, int num_se
)
447 struct nfs_write_data
*wdata
= data
;
449 if (unlikely(wdata
->header
->pnfs_error
)) {
450 bl_free_short_extents(&BLK_LSEG2EXT(wdata
->header
->lseg
)->bl_inval
,
454 wdata
->task
.tk_status
= wdata
->header
->pnfs_error
;
455 wdata
->verf
.committed
= NFS_FILE_SYNC
;
456 INIT_WORK(&wdata
->task
.u
.tk_work
, bl_write_cleanup
);
457 schedule_work(&wdata
->task
.u
.tk_work
);
460 /* FIXME STUB - mark intersection of layout and page as bad, so is not
463 static void mark_bad_read(void)
469 * map_block: map a requested I/0 block (isect) into an offset in the LVM
473 map_block(struct buffer_head
*bh
, sector_t isect
, struct pnfs_block_extent
*be
)
475 dprintk("%s enter be=%p\n", __func__
, be
);
477 set_buffer_mapped(bh
);
478 bh
->b_bdev
= be
->be_mdev
;
479 bh
->b_blocknr
= (isect
- be
->be_f_offset
+ be
->be_v_offset
) >>
480 (be
->be_mdev
->bd_inode
->i_blkbits
- SECTOR_SHIFT
);
482 dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n",
483 __func__
, (unsigned long long)isect
, (long)bh
->b_blocknr
,
489 bl_read_single_end_io(struct bio
*bio
, int error
)
491 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
492 struct page
*page
= bvec
->bv_page
;
494 /* Only one page in bvec */
499 bl_do_readpage_sync(struct page
*page
, struct pnfs_block_extent
*be
,
500 unsigned int offset
, unsigned int len
)
503 struct page
*shadow_page
;
505 char *kaddr
, *kshadow_addr
;
508 dprintk("%s: offset %u len %u\n", __func__
, offset
, len
);
510 shadow_page
= alloc_page(GFP_NOFS
| __GFP_HIGHMEM
);
511 if (shadow_page
== NULL
)
514 bio
= bio_alloc(GFP_NOIO
, 1);
518 isect
= (page
->index
<< PAGE_CACHE_SECTOR_SHIFT
) +
519 (offset
/ SECTOR_SIZE
);
521 bio
->bi_sector
= isect
- be
->be_f_offset
+ be
->be_v_offset
;
522 bio
->bi_bdev
= be
->be_mdev
;
523 bio
->bi_end_io
= bl_read_single_end_io
;
525 lock_page(shadow_page
);
526 if (bio_add_page(bio
, shadow_page
,
527 SECTOR_SIZE
, round_down(offset
, SECTOR_SIZE
)) == 0) {
528 unlock_page(shadow_page
);
533 submit_bio(READ
, bio
);
534 wait_on_page_locked(shadow_page
);
535 if (unlikely(!test_bit(BIO_UPTODATE
, &bio
->bi_flags
))) {
538 kaddr
= kmap_atomic(page
);
539 kshadow_addr
= kmap_atomic(shadow_page
);
540 memcpy(kaddr
+ offset
, kshadow_addr
+ offset
, len
);
541 kunmap_atomic(kshadow_addr
);
542 kunmap_atomic(kaddr
);
544 __free_page(shadow_page
);
551 bl_read_partial_page_sync(struct page
*page
, struct pnfs_block_extent
*be
,
552 unsigned int dirty_offset
, unsigned int dirty_len
,
556 unsigned int start
, end
;
560 end
= PAGE_CACHE_SIZE
;
562 start
= round_down(dirty_offset
, SECTOR_SIZE
);
563 end
= round_up(dirty_offset
+ dirty_len
, SECTOR_SIZE
);
566 dprintk("%s: offset %u len %d\n", __func__
, dirty_offset
, dirty_len
);
568 zero_user_segments(page
, start
, dirty_offset
,
569 dirty_offset
+ dirty_len
, end
);
570 if (start
== 0 && end
== PAGE_CACHE_SIZE
&&
571 trylock_page(page
)) {
572 SetPageUptodate(page
);
578 if (start
!= dirty_offset
)
579 ret
= bl_do_readpage_sync(page
, be
, start
, dirty_offset
- start
);
581 if (!ret
&& (dirty_offset
+ dirty_len
< end
))
582 ret
= bl_do_readpage_sync(page
, be
, dirty_offset
+ dirty_len
,
583 end
- dirty_offset
- dirty_len
);
588 /* Given an unmapped page, zero it or read in page for COW, page is locked
592 init_page_for_write(struct page
*page
, struct pnfs_block_extent
*cow_read
)
594 struct buffer_head
*bh
= NULL
;
598 dprintk("%s enter, %p\n", __func__
, page
);
599 BUG_ON(PageUptodate(page
));
601 zero_user_segment(page
, 0, PAGE_SIZE
);
602 SetPageUptodate(page
);
606 bh
= alloc_page_buffers(page
, PAGE_CACHE_SIZE
, 0);
612 isect
= (sector_t
) page
->index
<< PAGE_CACHE_SECTOR_SHIFT
;
613 map_block(bh
, isect
, cow_read
);
614 if (!bh_uptodate_or_lock(bh
))
615 ret
= bh_submit_read(bh
);
618 SetPageUptodate(page
);
622 free_buffer_head(bh
);
624 /* Need to mark layout with bad read...should now
625 * just use nfs4 for reads and writes.
632 /* Find or create a zeroing page marked being writeback.
633 * Return ERR_PTR on error, NULL to indicate skip this page and page itself
634 * to indicate write out.
637 bl_find_get_zeroing_page(struct inode
*inode
, pgoff_t index
,
638 struct pnfs_block_extent
*cow_read
)
642 page
= find_get_page(inode
->i_mapping
, index
);
646 page
= find_or_create_page(inode
->i_mapping
, index
, GFP_NOFS
);
647 if (unlikely(!page
)) {
648 dprintk("%s oom\n", __func__
);
649 return ERR_PTR(-ENOMEM
);
654 /* PageDirty: Other will write this out
655 * PageWriteback: Other is writing this out
656 * PageUptodate: It was read before
658 if (PageDirty(page
) || PageWriteback(page
)) {
662 page_cache_release(page
);
671 if (!PageUptodate(page
)) {
672 /* New page, readin or zero it */
673 init_page_for_write(page
, cow_read
);
675 set_page_writeback(page
);
681 static enum pnfs_try_status
682 bl_write_pagelist(struct nfs_write_data
*wdata
, int sync
)
684 struct nfs_pgio_header
*header
= wdata
->header
;
685 int i
, ret
, npg_zero
, pg_index
, last
= 0;
686 struct bio
*bio
= NULL
;
687 struct pnfs_block_extent
*be
= NULL
, *cow_read
= NULL
;
688 sector_t isect
, last_isect
= 0, extent_length
= 0;
689 struct parallel_io
*par
= NULL
;
690 loff_t offset
= wdata
->args
.offset
;
691 size_t count
= wdata
->args
.count
;
692 unsigned int pg_offset
, pg_len
, saved_len
;
693 struct page
**pages
= wdata
->args
.pages
;
698 NFS_SERVER(header
->inode
)->pnfs_blksize
>> PAGE_CACHE_SHIFT
;
700 dprintk("%s enter, %Zu@%lld\n", __func__
, count
, offset
);
702 if (header
->dreq
!= NULL
&&
703 (!IS_ALIGNED(offset
, NFS_SERVER(header
->inode
)->pnfs_blksize
) ||
704 !IS_ALIGNED(count
, NFS_SERVER(header
->inode
)->pnfs_blksize
))) {
705 dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n");
708 /* At this point, wdata->pages is a (sequential) list of nfs_pages.
709 * We want to write each, and if there is an error set pnfs_error
710 * to have it redone using nfs.
712 par
= alloc_parallel(wdata
);
715 par
->pnfs_callback
= bl_end_par_io_write
;
716 /* At this point, have to be more careful with error handling */
718 isect
= (sector_t
) ((offset
& (long)PAGE_CACHE_MASK
) >> SECTOR_SHIFT
);
719 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
), isect
, &cow_read
);
720 if (!be
|| !is_writable(be
, isect
)) {
721 dprintk("%s no matching extents!\n", __func__
);
725 /* First page inside INVALID extent */
726 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
727 if (likely(!bl_push_one_short_extent(be
->be_inval
)))
731 temp
= offset
>> PAGE_CACHE_SHIFT
;
732 npg_zero
= do_div(temp
, npg_per_block
);
733 isect
= (sector_t
) (((offset
- npg_zero
* PAGE_CACHE_SIZE
) &
734 (long)PAGE_CACHE_MASK
) >> SECTOR_SHIFT
);
735 extent_length
= be
->be_length
- (isect
- be
->be_f_offset
);
738 dprintk("%s need to zero %d pages\n", __func__
, npg_zero
);
739 for (;npg_zero
> 0; npg_zero
--) {
740 if (bl_is_sector_init(be
->be_inval
, isect
)) {
741 dprintk("isect %llu already init\n",
742 (unsigned long long)isect
);
745 /* page ref released in bl_end_io_write_zero */
746 index
= isect
>> PAGE_CACHE_SECTOR_SHIFT
;
747 dprintk("%s zero %dth page: index %lu isect %llu\n",
748 __func__
, npg_zero
, index
,
749 (unsigned long long)isect
);
750 page
= bl_find_get_zeroing_page(header
->inode
, index
,
752 if (unlikely(IS_ERR(page
))) {
753 header
->pnfs_error
= PTR_ERR(page
);
755 } else if (page
== NULL
)
758 ret
= bl_mark_sectors_init(be
->be_inval
, isect
,
761 dprintk("%s bl_mark_sectors_init fail %d\n",
763 end_page_writeback(page
);
764 page_cache_release(page
);
765 header
->pnfs_error
= ret
;
768 if (likely(!bl_push_one_short_extent(be
->be_inval
)))
771 end_page_writeback(page
);
772 page_cache_release(page
);
773 header
->pnfs_error
= -ENOMEM
;
776 /* FIXME: This should be done in bi_end_io */
777 mark_extents_written(BLK_LSEG2EXT(header
->lseg
),
778 page
->index
<< PAGE_CACHE_SHIFT
,
781 bio
= bl_add_page_to_bio(bio
, npg_zero
, WRITE
,
783 bl_end_io_write_zero
, par
);
785 header
->pnfs_error
= PTR_ERR(bio
);
790 isect
+= PAGE_CACHE_SECTORS
;
791 extent_length
-= PAGE_CACHE_SECTORS
;
796 bio
= bl_submit_bio(WRITE
, bio
);
799 pg_index
= wdata
->args
.pgbase
>> PAGE_CACHE_SHIFT
;
800 for (i
= pg_index
; i
< wdata
->pages
.npages
; i
++) {
801 if (!extent_length
) {
802 /* We've used up the previous extent */
804 bl_put_extent(cow_read
);
805 bio
= bl_submit_bio(WRITE
, bio
);
806 /* Get the next one */
807 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
),
809 if (!be
|| !is_writable(be
, isect
)) {
810 header
->pnfs_error
= -EINVAL
;
813 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
814 if (likely(!bl_push_one_short_extent(
818 header
->pnfs_error
= -ENOMEM
;
822 extent_length
= be
->be_length
-
823 (isect
- be
->be_f_offset
);
826 dprintk("%s offset %lld count %Zu\n", __func__
, offset
, count
);
827 pg_offset
= offset
& ~PAGE_CACHE_MASK
;
828 if (pg_offset
+ count
> PAGE_CACHE_SIZE
)
829 pg_len
= PAGE_CACHE_SIZE
- pg_offset
;
834 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
&&
835 !bl_is_sector_init(be
->be_inval
, isect
)) {
836 ret
= bl_read_partial_page_sync(pages
[i
], cow_read
,
837 pg_offset
, pg_len
, true);
839 dprintk("%s bl_read_partial_page_sync fail %d\n",
841 header
->pnfs_error
= ret
;
845 ret
= bl_mark_sectors_init(be
->be_inval
, isect
,
848 dprintk("%s bl_mark_sectors_init fail %d\n",
850 header
->pnfs_error
= ret
;
854 /* Expand to full page write */
856 pg_len
= PAGE_CACHE_SIZE
;
857 } else if ((pg_offset
& (SECTOR_SIZE
- 1)) ||
858 (pg_len
& (SECTOR_SIZE
- 1))){
859 /* ahh, nasty case. We have to do sync full sector
860 * read-modify-write cycles.
862 unsigned int saved_offset
= pg_offset
;
863 ret
= bl_read_partial_page_sync(pages
[i
], be
, pg_offset
,
865 pg_offset
= round_down(pg_offset
, SECTOR_SIZE
);
866 pg_len
= round_up(saved_offset
+ pg_len
, SECTOR_SIZE
)
871 bio
= do_add_page_to_bio(bio
, wdata
->pages
.npages
- i
, WRITE
,
873 bl_end_io_write
, par
,
876 header
->pnfs_error
= PTR_ERR(bio
);
882 isect
+= PAGE_CACHE_SECTORS
;
884 extent_length
-= PAGE_CACHE_SECTORS
;
887 /* Last page inside INVALID extent */
888 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
889 bio
= bl_submit_bio(WRITE
, bio
);
890 temp
= last_isect
>> PAGE_CACHE_SECTOR_SHIFT
;
891 npg_zero
= npg_per_block
- do_div(temp
, npg_per_block
);
892 if (npg_zero
< npg_per_block
) {
894 goto fill_invalid_ext
;
899 wdata
->res
.count
= wdata
->args
.count
;
902 bl_put_extent(cow_read
);
903 bl_submit_bio(WRITE
, bio
);
905 return PNFS_ATTEMPTED
;
908 bl_put_extent(cow_read
);
910 return PNFS_NOT_ATTEMPTED
;
913 /* FIXME - range ignored */
915 release_extents(struct pnfs_block_layout
*bl
, struct pnfs_layout_range
*range
)
918 struct pnfs_block_extent
*be
;
920 spin_lock(&bl
->bl_ext_lock
);
921 for (i
= 0; i
< EXTENT_LISTS
; i
++) {
922 while (!list_empty(&bl
->bl_extents
[i
])) {
923 be
= list_first_entry(&bl
->bl_extents
[i
],
924 struct pnfs_block_extent
,
926 list_del(&be
->be_node
);
930 spin_unlock(&bl
->bl_ext_lock
);
934 release_inval_marks(struct pnfs_inval_markings
*marks
)
936 struct pnfs_inval_tracking
*pos
, *temp
;
937 struct pnfs_block_short_extent
*se
, *stemp
;
939 list_for_each_entry_safe(pos
, temp
, &marks
->im_tree
.mtt_stub
, it_link
) {
940 list_del(&pos
->it_link
);
944 list_for_each_entry_safe(se
, stemp
, &marks
->im_extents
, bse_node
) {
945 list_del(&se
->bse_node
);
951 static void bl_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
953 struct pnfs_block_layout
*bl
= BLK_LO2EXT(lo
);
955 dprintk("%s enter\n", __func__
);
956 release_extents(bl
, NULL
);
957 release_inval_marks(&bl
->bl_inval
);
961 static struct pnfs_layout_hdr
*bl_alloc_layout_hdr(struct inode
*inode
,
964 struct pnfs_block_layout
*bl
;
966 dprintk("%s enter\n", __func__
);
967 bl
= kzalloc(sizeof(*bl
), gfp_flags
);
970 spin_lock_init(&bl
->bl_ext_lock
);
971 INIT_LIST_HEAD(&bl
->bl_extents
[0]);
972 INIT_LIST_HEAD(&bl
->bl_extents
[1]);
973 INIT_LIST_HEAD(&bl
->bl_commit
);
974 INIT_LIST_HEAD(&bl
->bl_committing
);
976 bl
->bl_blocksize
= NFS_SERVER(inode
)->pnfs_blksize
>> SECTOR_SHIFT
;
977 BL_INIT_INVAL_MARKS(&bl
->bl_inval
, bl
->bl_blocksize
);
978 return &bl
->bl_layout
;
981 static void bl_free_lseg(struct pnfs_layout_segment
*lseg
)
983 dprintk("%s enter\n", __func__
);
987 /* We pretty much ignore lseg, and store all data layout wide, so we
988 * can correctly merge.
990 static struct pnfs_layout_segment
*bl_alloc_lseg(struct pnfs_layout_hdr
*lo
,
991 struct nfs4_layoutget_res
*lgr
,
994 struct pnfs_layout_segment
*lseg
;
997 dprintk("%s enter\n", __func__
);
998 lseg
= kzalloc(sizeof(*lseg
), gfp_flags
);
1000 return ERR_PTR(-ENOMEM
);
1001 status
= nfs4_blk_process_layoutget(lo
, lgr
, gfp_flags
);
1003 /* We don't want to call the full-blown bl_free_lseg,
1004 * since on error extents were not touched.
1007 return ERR_PTR(status
);
1013 bl_encode_layoutcommit(struct pnfs_layout_hdr
*lo
, struct xdr_stream
*xdr
,
1014 const struct nfs4_layoutcommit_args
*arg
)
1016 dprintk("%s enter\n", __func__
);
1017 encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo
), xdr
, arg
);
1021 bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*lcdata
)
1023 struct pnfs_layout_hdr
*lo
= NFS_I(lcdata
->args
.inode
)->layout
;
1025 dprintk("%s enter\n", __func__
);
1026 clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo
), &lcdata
->args
, lcdata
->res
.status
);
1029 static void free_blk_mountid(struct block_mount_id
*mid
)
1032 struct pnfs_block_dev
*dev
, *tmp
;
1034 /* No need to take bm_lock as we are last user freeing bm_devlist */
1035 list_for_each_entry_safe(dev
, tmp
, &mid
->bm_devlist
, bm_node
) {
1036 list_del(&dev
->bm_node
);
1037 bl_free_block_dev(dev
);
1043 /* This is mostly copied from the filelayout_get_device_info function.
1044 * It seems much of this should be at the generic pnfs level.
1046 static struct pnfs_block_dev
*
1047 nfs4_blk_get_deviceinfo(struct nfs_server
*server
, const struct nfs_fh
*fh
,
1048 struct nfs4_deviceid
*d_id
)
1050 struct pnfs_device
*dev
;
1051 struct pnfs_block_dev
*rv
;
1054 struct page
**pages
= NULL
;
1058 * Use the session max response size as the basis for setting
1059 * GETDEVICEINFO's maxcount
1061 max_resp_sz
= server
->nfs_client
->cl_session
->fc_attrs
.max_resp_sz
;
1062 max_pages
= nfs_page_array_len(0, max_resp_sz
);
1063 dprintk("%s max_resp_sz %u max_pages %d\n",
1064 __func__
, max_resp_sz
, max_pages
);
1066 dev
= kmalloc(sizeof(*dev
), GFP_NOFS
);
1068 dprintk("%s kmalloc failed\n", __func__
);
1069 return ERR_PTR(-ENOMEM
);
1072 pages
= kzalloc(max_pages
* sizeof(struct page
*), GFP_NOFS
);
1073 if (pages
== NULL
) {
1075 return ERR_PTR(-ENOMEM
);
1077 for (i
= 0; i
< max_pages
; i
++) {
1078 pages
[i
] = alloc_page(GFP_NOFS
);
1080 rv
= ERR_PTR(-ENOMEM
);
1085 memcpy(&dev
->dev_id
, d_id
, sizeof(*d_id
));
1086 dev
->layout_type
= LAYOUT_BLOCK_VOLUME
;
1089 dev
->pglen
= PAGE_SIZE
* max_pages
;
1092 dprintk("%s: dev_id: %s\n", __func__
, dev
->dev_id
.data
);
1093 rc
= nfs4_proc_getdeviceinfo(server
, dev
);
1094 dprintk("%s getdevice info returns %d\n", __func__
, rc
);
1100 rv
= nfs4_blk_decode_device(server
, dev
);
1102 for (i
= 0; i
< max_pages
; i
++)
1103 __free_page(pages
[i
]);
1110 bl_set_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*fh
)
1112 struct block_mount_id
*b_mt_id
= NULL
;
1113 struct pnfs_devicelist
*dlist
= NULL
;
1114 struct pnfs_block_dev
*bdev
;
1115 LIST_HEAD(block_disklist
);
1118 dprintk("%s enter\n", __func__
);
1120 if (server
->pnfs_blksize
== 0) {
1121 dprintk("%s Server did not return blksize\n", __func__
);
1124 b_mt_id
= kzalloc(sizeof(struct block_mount_id
), GFP_NOFS
);
1129 /* Initialize nfs4 block layout mount id */
1130 spin_lock_init(&b_mt_id
->bm_lock
);
1131 INIT_LIST_HEAD(&b_mt_id
->bm_devlist
);
1133 dlist
= kmalloc(sizeof(struct pnfs_devicelist
), GFP_NOFS
);
1139 while (!dlist
->eof
) {
1140 status
= nfs4_proc_getdevicelist(server
, fh
, dlist
);
1143 dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
1144 __func__
, dlist
->num_devs
, dlist
->eof
);
1145 for (i
= 0; i
< dlist
->num_devs
; i
++) {
1146 bdev
= nfs4_blk_get_deviceinfo(server
, fh
,
1149 status
= PTR_ERR(bdev
);
1152 spin_lock(&b_mt_id
->bm_lock
);
1153 list_add(&bdev
->bm_node
, &b_mt_id
->bm_devlist
);
1154 spin_unlock(&b_mt_id
->bm_lock
);
1157 dprintk("%s SUCCESS\n", __func__
);
1158 server
->pnfs_ld_data
= b_mt_id
;
1165 free_blk_mountid(b_mt_id
);
1170 bl_clear_layoutdriver(struct nfs_server
*server
)
1172 struct block_mount_id
*b_mt_id
= server
->pnfs_ld_data
;
1174 dprintk("%s enter\n", __func__
);
1175 free_blk_mountid(b_mt_id
);
1176 dprintk("%s RETURNS\n", __func__
);
1181 is_aligned_req(struct nfs_page
*req
, unsigned int alignment
)
1183 return IS_ALIGNED(req
->wb_offset
, alignment
) &&
1184 IS_ALIGNED(req
->wb_bytes
, alignment
);
1188 bl_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1190 if (pgio
->pg_dreq
!= NULL
&&
1191 !is_aligned_req(req
, SECTOR_SIZE
))
1192 nfs_pageio_reset_read_mds(pgio
);
1194 pnfs_generic_pg_init_read(pgio
, req
);
1198 bl_pg_test_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1199 struct nfs_page
*req
)
1201 if (pgio
->pg_dreq
!= NULL
&&
1202 !is_aligned_req(req
, SECTOR_SIZE
))
1205 return pnfs_generic_pg_test(pgio
, prev
, req
);
1209 * Return the number of contiguous bytes for a given inode
1210 * starting at page frame idx.
1212 static u64
pnfs_num_cont_bytes(struct inode
*inode
, pgoff_t idx
)
1214 struct address_space
*mapping
= inode
->i_mapping
;
1217 /* Optimize common case that writes from 0 to end of file */
1218 end
= DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
);
1219 if (end
!= NFS_I(inode
)->npages
) {
1221 end
= radix_tree_next_hole(&mapping
->page_tree
, idx
+ 1, ULONG_MAX
);
1226 return i_size_read(inode
) - (idx
<< PAGE_CACHE_SHIFT
);
1228 return (end
- idx
) << PAGE_CACHE_SHIFT
;
1232 bl_pg_init_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1234 if (pgio
->pg_dreq
!= NULL
&&
1235 !is_aligned_req(req
, PAGE_CACHE_SIZE
)) {
1236 nfs_pageio_reset_write_mds(pgio
);
1239 if (pgio
->pg_dreq
== NULL
)
1240 wb_size
= pnfs_num_cont_bytes(pgio
->pg_inode
,
1243 wb_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1245 pnfs_generic_pg_init_write(pgio
, req
, wb_size
);
1250 bl_pg_test_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1251 struct nfs_page
*req
)
1253 if (pgio
->pg_dreq
!= NULL
&&
1254 !is_aligned_req(req
, PAGE_CACHE_SIZE
))
1257 return pnfs_generic_pg_test(pgio
, prev
, req
);
1260 static const struct nfs_pageio_ops bl_pg_read_ops
= {
1261 .pg_init
= bl_pg_init_read
,
1262 .pg_test
= bl_pg_test_read
,
1263 .pg_doio
= pnfs_generic_pg_readpages
,
1266 static const struct nfs_pageio_ops bl_pg_write_ops
= {
1267 .pg_init
= bl_pg_init_write
,
1268 .pg_test
= bl_pg_test_write
,
1269 .pg_doio
= pnfs_generic_pg_writepages
,
1272 static struct pnfs_layoutdriver_type blocklayout_type
= {
1273 .id
= LAYOUT_BLOCK_VOLUME
,
1274 .name
= "LAYOUT_BLOCK_VOLUME",
1275 .read_pagelist
= bl_read_pagelist
,
1276 .write_pagelist
= bl_write_pagelist
,
1277 .alloc_layout_hdr
= bl_alloc_layout_hdr
,
1278 .free_layout_hdr
= bl_free_layout_hdr
,
1279 .alloc_lseg
= bl_alloc_lseg
,
1280 .free_lseg
= bl_free_lseg
,
1281 .encode_layoutcommit
= bl_encode_layoutcommit
,
1282 .cleanup_layoutcommit
= bl_cleanup_layoutcommit
,
1283 .set_layoutdriver
= bl_set_layoutdriver
,
1284 .clear_layoutdriver
= bl_clear_layoutdriver
,
1285 .pg_read_ops
= &bl_pg_read_ops
,
1286 .pg_write_ops
= &bl_pg_write_ops
,
1289 static const struct rpc_pipe_ops bl_upcall_ops
= {
1290 .upcall
= rpc_pipe_generic_upcall
,
1291 .downcall
= bl_pipe_downcall
,
1292 .destroy_msg
= bl_pipe_destroy_msg
,
1295 static struct dentry
*nfs4blocklayout_register_sb(struct super_block
*sb
,
1296 struct rpc_pipe
*pipe
)
1298 struct dentry
*dir
, *dentry
;
1300 dir
= rpc_d_lookup_sb(sb
, NFS_PIPE_DIRNAME
);
1302 return ERR_PTR(-ENOENT
);
1303 dentry
= rpc_mkpipe_dentry(dir
, "blocklayout", NULL
, pipe
);
1308 static void nfs4blocklayout_unregister_sb(struct super_block
*sb
,
1309 struct rpc_pipe
*pipe
)
1312 rpc_unlink(pipe
->dentry
);
1315 static int rpc_pipefs_event(struct notifier_block
*nb
, unsigned long event
,
1318 struct super_block
*sb
= ptr
;
1319 struct net
*net
= sb
->s_fs_info
;
1320 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1321 struct dentry
*dentry
;
1324 if (!try_module_get(THIS_MODULE
))
1327 if (nn
->bl_device_pipe
== NULL
) {
1328 module_put(THIS_MODULE
);
1333 case RPC_PIPEFS_MOUNT
:
1334 dentry
= nfs4blocklayout_register_sb(sb
, nn
->bl_device_pipe
);
1335 if (IS_ERR(dentry
)) {
1336 ret
= PTR_ERR(dentry
);
1339 nn
->bl_device_pipe
->dentry
= dentry
;
1341 case RPC_PIPEFS_UMOUNT
:
1342 if (nn
->bl_device_pipe
->dentry
)
1343 nfs4blocklayout_unregister_sb(sb
, nn
->bl_device_pipe
);
1349 module_put(THIS_MODULE
);
1353 static struct notifier_block nfs4blocklayout_block
= {
1354 .notifier_call
= rpc_pipefs_event
,
1357 static struct dentry
*nfs4blocklayout_register_net(struct net
*net
,
1358 struct rpc_pipe
*pipe
)
1360 struct super_block
*pipefs_sb
;
1361 struct dentry
*dentry
;
1363 pipefs_sb
= rpc_get_sb_net(net
);
1366 dentry
= nfs4blocklayout_register_sb(pipefs_sb
, pipe
);
1367 rpc_put_sb_net(net
);
1371 static void nfs4blocklayout_unregister_net(struct net
*net
,
1372 struct rpc_pipe
*pipe
)
1374 struct super_block
*pipefs_sb
;
1376 pipefs_sb
= rpc_get_sb_net(net
);
1378 nfs4blocklayout_unregister_sb(pipefs_sb
, pipe
);
1379 rpc_put_sb_net(net
);
1383 static int nfs4blocklayout_net_init(struct net
*net
)
1385 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1386 struct dentry
*dentry
;
1388 init_waitqueue_head(&nn
->bl_wq
);
1389 nn
->bl_device_pipe
= rpc_mkpipe_data(&bl_upcall_ops
, 0);
1390 if (IS_ERR(nn
->bl_device_pipe
))
1391 return PTR_ERR(nn
->bl_device_pipe
);
1392 dentry
= nfs4blocklayout_register_net(net
, nn
->bl_device_pipe
);
1393 if (IS_ERR(dentry
)) {
1394 rpc_destroy_pipe_data(nn
->bl_device_pipe
);
1395 return PTR_ERR(dentry
);
1397 nn
->bl_device_pipe
->dentry
= dentry
;
1401 static void nfs4blocklayout_net_exit(struct net
*net
)
1403 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1405 nfs4blocklayout_unregister_net(net
, nn
->bl_device_pipe
);
1406 rpc_destroy_pipe_data(nn
->bl_device_pipe
);
1407 nn
->bl_device_pipe
= NULL
;
1410 static struct pernet_operations nfs4blocklayout_net_ops
= {
1411 .init
= nfs4blocklayout_net_init
,
1412 .exit
= nfs4blocklayout_net_exit
,
1415 static int __init
nfs4blocklayout_init(void)
1419 dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__
);
1421 ret
= pnfs_register_layoutdriver(&blocklayout_type
);
1425 ret
= rpc_pipefs_notifier_register(&nfs4blocklayout_block
);
1428 ret
= register_pernet_subsys(&nfs4blocklayout_net_ops
);
1435 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block
);
1437 pnfs_unregister_layoutdriver(&blocklayout_type
);
1441 static void __exit
nfs4blocklayout_exit(void)
1443 dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
1446 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block
);
1447 unregister_pernet_subsys(&nfs4blocklayout_net_ops
);
1448 pnfs_unregister_layoutdriver(&blocklayout_type
);
1451 MODULE_ALIAS("nfs-layouttype4-3");
1453 module_init(nfs4blocklayout_init
);
1454 module_exit(nfs4blocklayout_exit
);