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 "../nfs4session.h"
44 #include "../internal.h"
45 #include "blocklayout.h"
47 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
49 MODULE_LICENSE("GPL");
50 MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>");
51 MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver");
53 static void print_page(struct page
*page
)
55 dprintk("PRINTPAGE page %p\n", page
);
56 dprintk(" PagePrivate %d\n", PagePrivate(page
));
57 dprintk(" PageUptodate %d\n", PageUptodate(page
));
58 dprintk(" PageError %d\n", PageError(page
));
59 dprintk(" PageDirty %d\n", PageDirty(page
));
60 dprintk(" PageReferenced %d\n", PageReferenced(page
));
61 dprintk(" PageLocked %d\n", PageLocked(page
));
62 dprintk(" PageWriteback %d\n", PageWriteback(page
));
63 dprintk(" PageMappedToDisk %d\n", PageMappedToDisk(page
));
67 /* Given the be associated with isect, determine if page data needs to be
70 static int is_hole(struct pnfs_block_extent
*be
, sector_t isect
)
72 if (be
->be_state
== PNFS_BLOCK_NONE_DATA
)
74 else if (be
->be_state
!= PNFS_BLOCK_INVALID_DATA
)
77 return !bl_is_sector_init(be
->be_inval
, isect
);
80 /* Given the be associated with isect, determine if page data can be
83 static int is_writable(struct pnfs_block_extent
*be
, sector_t isect
)
85 return (be
->be_state
== PNFS_BLOCK_READWRITE_DATA
||
86 be
->be_state
== PNFS_BLOCK_INVALID_DATA
);
89 /* The data we are handed might be spread across several bios. We need
90 * to track when the last one is finished.
94 void (*pnfs_callback
) (void *data
, int num_se
);
99 static inline struct parallel_io
*alloc_parallel(void *data
)
101 struct parallel_io
*rv
;
103 rv
= kmalloc(sizeof(*rv
), GFP_NOFS
);
106 kref_init(&rv
->refcnt
);
112 static inline void get_parallel(struct parallel_io
*p
)
114 kref_get(&p
->refcnt
);
117 static void destroy_parallel(struct kref
*kref
)
119 struct parallel_io
*p
= container_of(kref
, struct parallel_io
, refcnt
);
121 dprintk("%s enter\n", __func__
);
122 p
->pnfs_callback(p
->data
, p
->bse_count
);
126 static inline void put_parallel(struct parallel_io
*p
)
128 kref_put(&p
->refcnt
, destroy_parallel
);
132 bl_submit_bio(int rw
, struct bio
*bio
)
135 get_parallel(bio
->bi_private
);
136 dprintk("%s submitting %s bio %u@%llu\n", __func__
,
137 rw
== READ
? "read" : "write",
138 bio
->bi_size
, (unsigned long long)bio
->bi_sector
);
144 static struct bio
*bl_alloc_init_bio(int npg
, sector_t isect
,
145 struct pnfs_block_extent
*be
,
146 void (*end_io
)(struct bio
*, int err
),
147 struct parallel_io
*par
)
151 npg
= min(npg
, BIO_MAX_PAGES
);
152 bio
= bio_alloc(GFP_NOIO
, npg
);
153 if (!bio
&& (current
->flags
& PF_MEMALLOC
)) {
154 while (!bio
&& (npg
/= 2))
155 bio
= bio_alloc(GFP_NOIO
, npg
);
159 bio
->bi_sector
= isect
- be
->be_f_offset
+ be
->be_v_offset
;
160 bio
->bi_bdev
= be
->be_mdev
;
161 bio
->bi_end_io
= end_io
;
162 bio
->bi_private
= par
;
167 static struct bio
*do_add_page_to_bio(struct bio
*bio
, int npg
, int rw
,
168 sector_t isect
, struct page
*page
,
169 struct pnfs_block_extent
*be
,
170 void (*end_io
)(struct bio
*, int err
),
171 struct parallel_io
*par
,
172 unsigned int offset
, int len
)
174 isect
= isect
+ (offset
>> SECTOR_SHIFT
);
175 dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__
,
176 npg
, rw
, (unsigned long long)isect
, offset
, len
);
179 bio
= bl_alloc_init_bio(npg
, isect
, be
, end_io
, par
);
181 return ERR_PTR(-ENOMEM
);
183 if (bio_add_page(bio
, page
, len
, offset
) < len
) {
184 bio
= bl_submit_bio(rw
, bio
);
190 static struct bio
*bl_add_page_to_bio(struct bio
*bio
, int npg
, int rw
,
191 sector_t isect
, struct page
*page
,
192 struct pnfs_block_extent
*be
,
193 void (*end_io
)(struct bio
*, int err
),
194 struct parallel_io
*par
)
196 return do_add_page_to_bio(bio
, npg
, rw
, isect
, page
, be
,
197 end_io
, par
, 0, PAGE_CACHE_SIZE
);
200 /* This is basically copied from mpage_end_io_read */
201 static void bl_end_io_read(struct bio
*bio
, int err
)
203 struct parallel_io
*par
= bio
->bi_private
;
204 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
205 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
208 struct page
*page
= bvec
->bv_page
;
210 if (--bvec
>= bio
->bi_io_vec
)
211 prefetchw(&bvec
->bv_page
->flags
);
213 SetPageUptodate(page
);
214 } while (bvec
>= bio
->bi_io_vec
);
216 struct nfs_read_data
*rdata
= par
->data
;
217 struct nfs_pgio_header
*header
= rdata
->header
;
219 if (!header
->pnfs_error
)
220 header
->pnfs_error
= -EIO
;
221 pnfs_set_lo_fail(header
->lseg
);
227 static void bl_read_cleanup(struct work_struct
*work
)
229 struct rpc_task
*task
;
230 struct nfs_read_data
*rdata
;
231 dprintk("%s enter\n", __func__
);
232 task
= container_of(work
, struct rpc_task
, u
.tk_work
);
233 rdata
= container_of(task
, struct nfs_read_data
, task
);
234 pnfs_ld_read_done(rdata
);
238 bl_end_par_io_read(void *data
, int unused
)
240 struct nfs_read_data
*rdata
= data
;
242 rdata
->task
.tk_status
= rdata
->header
->pnfs_error
;
243 INIT_WORK(&rdata
->task
.u
.tk_work
, bl_read_cleanup
);
244 schedule_work(&rdata
->task
.u
.tk_work
);
247 static enum pnfs_try_status
248 bl_read_pagelist(struct nfs_read_data
*rdata
)
250 struct nfs_pgio_header
*header
= rdata
->header
;
252 struct bio
*bio
= NULL
;
253 struct pnfs_block_extent
*be
= NULL
, *cow_read
= NULL
;
254 sector_t isect
, extent_length
= 0;
255 struct parallel_io
*par
;
256 loff_t f_offset
= rdata
->args
.offset
;
257 size_t bytes_left
= rdata
->args
.count
;
258 unsigned int pg_offset
, pg_len
;
259 struct page
**pages
= rdata
->args
.pages
;
260 int pg_index
= rdata
->args
.pgbase
>> PAGE_CACHE_SHIFT
;
261 const bool is_dio
= (header
->dreq
!= NULL
);
263 dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__
,
264 rdata
->pages
.npages
, f_offset
, (unsigned int)rdata
->args
.count
);
266 par
= alloc_parallel(rdata
);
269 par
->pnfs_callback
= bl_end_par_io_read
;
270 /* At this point, we can no longer jump to use_mds */
272 isect
= (sector_t
) (f_offset
>> SECTOR_SHIFT
);
273 /* Code assumes extents are page-aligned */
274 for (i
= pg_index
; i
< rdata
->pages
.npages
; i
++) {
275 if (!extent_length
) {
276 /* We've used up the previous extent */
278 bl_put_extent(cow_read
);
279 bio
= bl_submit_bio(READ
, bio
);
280 /* Get the next one */
281 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
),
284 header
->pnfs_error
= -EIO
;
287 extent_length
= be
->be_length
-
288 (isect
- be
->be_f_offset
);
290 sector_t cow_length
= cow_read
->be_length
-
291 (isect
- cow_read
->be_f_offset
);
292 extent_length
= min(extent_length
, cow_length
);
297 pg_offset
= f_offset
& ~PAGE_CACHE_MASK
;
298 if (pg_offset
+ bytes_left
> PAGE_CACHE_SIZE
)
299 pg_len
= PAGE_CACHE_SIZE
- pg_offset
;
304 bytes_left
-= pg_len
;
305 isect
+= (pg_offset
>> SECTOR_SHIFT
);
308 pg_len
= PAGE_CACHE_SIZE
;
311 hole
= is_hole(be
, isect
);
312 if (hole
&& !cow_read
) {
313 bio
= bl_submit_bio(READ
, bio
);
314 /* Fill hole w/ zeroes w/o accessing device */
315 dprintk("%s Zeroing page for hole\n", __func__
);
316 zero_user_segment(pages
[i
], pg_offset
, pg_len
);
317 print_page(pages
[i
]);
318 SetPageUptodate(pages
[i
]);
320 struct pnfs_block_extent
*be_read
;
322 be_read
= (hole
&& cow_read
) ? cow_read
: be
;
323 bio
= do_add_page_to_bio(bio
, rdata
->pages
.npages
- i
,
325 isect
, pages
[i
], be_read
,
329 header
->pnfs_error
= PTR_ERR(bio
);
334 isect
+= (pg_len
>> SECTOR_SHIFT
);
335 extent_length
-= PAGE_CACHE_SECTORS
;
337 if ((isect
<< SECTOR_SHIFT
) >= header
->inode
->i_size
) {
339 rdata
->res
.count
= header
->inode
->i_size
- rdata
->args
.offset
;
341 rdata
->res
.count
= (isect
<< SECTOR_SHIFT
) - rdata
->args
.offset
;
345 bl_put_extent(cow_read
);
346 bl_submit_bio(READ
, bio
);
348 return PNFS_ATTEMPTED
;
351 dprintk("Giving up and using normal NFS\n");
352 return PNFS_NOT_ATTEMPTED
;
355 static void mark_extents_written(struct pnfs_block_layout
*bl
,
356 __u64 offset
, __u32 count
)
359 struct pnfs_block_extent
*be
;
360 struct pnfs_block_short_extent
*se
;
362 dprintk("%s(%llu, %u)\n", __func__
, offset
, count
);
365 isect
= (offset
& (long)(PAGE_CACHE_MASK
)) >> SECTOR_SHIFT
;
366 end
= (offset
+ count
+ PAGE_CACHE_SIZE
- 1) & (long)(PAGE_CACHE_MASK
);
367 end
>>= SECTOR_SHIFT
;
368 while (isect
< end
) {
370 be
= bl_find_get_extent(bl
, isect
, NULL
);
371 BUG_ON(!be
); /* FIXME */
372 len
= min(end
, be
->be_f_offset
+ be
->be_length
) - isect
;
373 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
374 se
= bl_pop_one_short_extent(be
->be_inval
);
376 bl_mark_for_commit(be
, isect
, len
, se
);
383 static void bl_end_io_write_zero(struct bio
*bio
, int err
)
385 struct parallel_io
*par
= bio
->bi_private
;
386 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
387 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
390 struct page
*page
= bvec
->bv_page
;
392 if (--bvec
>= bio
->bi_io_vec
)
393 prefetchw(&bvec
->bv_page
->flags
);
394 /* This is the zeroing page we added */
395 end_page_writeback(page
);
396 page_cache_release(page
);
397 } while (bvec
>= bio
->bi_io_vec
);
399 if (unlikely(!uptodate
)) {
400 struct nfs_write_data
*data
= par
->data
;
401 struct nfs_pgio_header
*header
= data
->header
;
403 if (!header
->pnfs_error
)
404 header
->pnfs_error
= -EIO
;
405 pnfs_set_lo_fail(header
->lseg
);
411 static void bl_end_io_write(struct bio
*bio
, int err
)
413 struct parallel_io
*par
= bio
->bi_private
;
414 const int uptodate
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
415 struct nfs_write_data
*data
= par
->data
;
416 struct nfs_pgio_header
*header
= data
->header
;
419 if (!header
->pnfs_error
)
420 header
->pnfs_error
= -EIO
;
421 pnfs_set_lo_fail(header
->lseg
);
427 /* Function scheduled for call during bl_end_par_io_write,
428 * it marks sectors as written and extends the commitlist.
430 static void bl_write_cleanup(struct work_struct
*work
)
432 struct rpc_task
*task
;
433 struct nfs_write_data
*wdata
;
434 dprintk("%s enter\n", __func__
);
435 task
= container_of(work
, struct rpc_task
, u
.tk_work
);
436 wdata
= container_of(task
, struct nfs_write_data
, task
);
437 if (likely(!wdata
->header
->pnfs_error
)) {
438 /* Marks for LAYOUTCOMMIT */
439 mark_extents_written(BLK_LSEG2EXT(wdata
->header
->lseg
),
440 wdata
->args
.offset
, wdata
->args
.count
);
442 pnfs_ld_write_done(wdata
);
445 /* Called when last of bios associated with a bl_write_pagelist call finishes */
446 static void bl_end_par_io_write(void *data
, int num_se
)
448 struct nfs_write_data
*wdata
= data
;
450 if (unlikely(wdata
->header
->pnfs_error
)) {
451 bl_free_short_extents(&BLK_LSEG2EXT(wdata
->header
->lseg
)->bl_inval
,
455 wdata
->task
.tk_status
= wdata
->header
->pnfs_error
;
456 wdata
->verf
.committed
= NFS_FILE_SYNC
;
457 INIT_WORK(&wdata
->task
.u
.tk_work
, bl_write_cleanup
);
458 schedule_work(&wdata
->task
.u
.tk_work
);
461 /* FIXME STUB - mark intersection of layout and page as bad, so is not
464 static void mark_bad_read(void)
470 * map_block: map a requested I/0 block (isect) into an offset in the LVM
474 map_block(struct buffer_head
*bh
, sector_t isect
, struct pnfs_block_extent
*be
)
476 dprintk("%s enter be=%p\n", __func__
, be
);
478 set_buffer_mapped(bh
);
479 bh
->b_bdev
= be
->be_mdev
;
480 bh
->b_blocknr
= (isect
- be
->be_f_offset
+ be
->be_v_offset
) >>
481 (be
->be_mdev
->bd_inode
->i_blkbits
- SECTOR_SHIFT
);
483 dprintk("%s isect %llu, bh->b_blocknr %ld, using bsize %Zd\n",
484 __func__
, (unsigned long long)isect
, (long)bh
->b_blocknr
,
490 bl_read_single_end_io(struct bio
*bio
, int error
)
492 struct bio_vec
*bvec
= bio
->bi_io_vec
+ bio
->bi_vcnt
- 1;
493 struct page
*page
= bvec
->bv_page
;
495 /* Only one page in bvec */
500 bl_do_readpage_sync(struct page
*page
, struct pnfs_block_extent
*be
,
501 unsigned int offset
, unsigned int len
)
504 struct page
*shadow_page
;
506 char *kaddr
, *kshadow_addr
;
509 dprintk("%s: offset %u len %u\n", __func__
, offset
, len
);
511 shadow_page
= alloc_page(GFP_NOFS
| __GFP_HIGHMEM
);
512 if (shadow_page
== NULL
)
515 bio
= bio_alloc(GFP_NOIO
, 1);
519 isect
= (page
->index
<< PAGE_CACHE_SECTOR_SHIFT
) +
520 (offset
/ SECTOR_SIZE
);
522 bio
->bi_sector
= isect
- be
->be_f_offset
+ be
->be_v_offset
;
523 bio
->bi_bdev
= be
->be_mdev
;
524 bio
->bi_end_io
= bl_read_single_end_io
;
526 lock_page(shadow_page
);
527 if (bio_add_page(bio
, shadow_page
,
528 SECTOR_SIZE
, round_down(offset
, SECTOR_SIZE
)) == 0) {
529 unlock_page(shadow_page
);
534 submit_bio(READ
, bio
);
535 wait_on_page_locked(shadow_page
);
536 if (unlikely(!test_bit(BIO_UPTODATE
, &bio
->bi_flags
))) {
539 kaddr
= kmap_atomic(page
);
540 kshadow_addr
= kmap_atomic(shadow_page
);
541 memcpy(kaddr
+ offset
, kshadow_addr
+ offset
, len
);
542 kunmap_atomic(kshadow_addr
);
543 kunmap_atomic(kaddr
);
545 __free_page(shadow_page
);
552 bl_read_partial_page_sync(struct page
*page
, struct pnfs_block_extent
*be
,
553 unsigned int dirty_offset
, unsigned int dirty_len
,
557 unsigned int start
, end
;
561 end
= PAGE_CACHE_SIZE
;
563 start
= round_down(dirty_offset
, SECTOR_SIZE
);
564 end
= round_up(dirty_offset
+ dirty_len
, SECTOR_SIZE
);
567 dprintk("%s: offset %u len %d\n", __func__
, dirty_offset
, dirty_len
);
569 zero_user_segments(page
, start
, dirty_offset
,
570 dirty_offset
+ dirty_len
, end
);
571 if (start
== 0 && end
== PAGE_CACHE_SIZE
&&
572 trylock_page(page
)) {
573 SetPageUptodate(page
);
579 if (start
!= dirty_offset
)
580 ret
= bl_do_readpage_sync(page
, be
, start
, dirty_offset
- start
);
582 if (!ret
&& (dirty_offset
+ dirty_len
< end
))
583 ret
= bl_do_readpage_sync(page
, be
, dirty_offset
+ dirty_len
,
584 end
- dirty_offset
- dirty_len
);
589 /* Given an unmapped page, zero it or read in page for COW, page is locked
593 init_page_for_write(struct page
*page
, struct pnfs_block_extent
*cow_read
)
595 struct buffer_head
*bh
= NULL
;
599 dprintk("%s enter, %p\n", __func__
, page
);
600 BUG_ON(PageUptodate(page
));
602 zero_user_segment(page
, 0, PAGE_SIZE
);
603 SetPageUptodate(page
);
607 bh
= alloc_page_buffers(page
, PAGE_CACHE_SIZE
, 0);
613 isect
= (sector_t
) page
->index
<< PAGE_CACHE_SECTOR_SHIFT
;
614 map_block(bh
, isect
, cow_read
);
615 if (!bh_uptodate_or_lock(bh
))
616 ret
= bh_submit_read(bh
);
619 SetPageUptodate(page
);
623 free_buffer_head(bh
);
625 /* Need to mark layout with bad read...should now
626 * just use nfs4 for reads and writes.
633 /* Find or create a zeroing page marked being writeback.
634 * Return ERR_PTR on error, NULL to indicate skip this page and page itself
635 * to indicate write out.
638 bl_find_get_zeroing_page(struct inode
*inode
, pgoff_t index
,
639 struct pnfs_block_extent
*cow_read
)
643 page
= find_get_page(inode
->i_mapping
, index
);
647 page
= find_or_create_page(inode
->i_mapping
, index
, GFP_NOFS
);
648 if (unlikely(!page
)) {
649 dprintk("%s oom\n", __func__
);
650 return ERR_PTR(-ENOMEM
);
655 /* PageDirty: Other will write this out
656 * PageWriteback: Other is writing this out
657 * PageUptodate: It was read before
659 if (PageDirty(page
) || PageWriteback(page
)) {
663 page_cache_release(page
);
672 if (!PageUptodate(page
)) {
673 /* New page, readin or zero it */
674 init_page_for_write(page
, cow_read
);
676 set_page_writeback(page
);
682 static enum pnfs_try_status
683 bl_write_pagelist(struct nfs_write_data
*wdata
, int sync
)
685 struct nfs_pgio_header
*header
= wdata
->header
;
686 int i
, ret
, npg_zero
, pg_index
, last
= 0;
687 struct bio
*bio
= NULL
;
688 struct pnfs_block_extent
*be
= NULL
, *cow_read
= NULL
;
689 sector_t isect
, last_isect
= 0, extent_length
= 0;
690 struct parallel_io
*par
= NULL
;
691 loff_t offset
= wdata
->args
.offset
;
692 size_t count
= wdata
->args
.count
;
693 unsigned int pg_offset
, pg_len
, saved_len
;
694 struct page
**pages
= wdata
->args
.pages
;
699 NFS_SERVER(header
->inode
)->pnfs_blksize
>> PAGE_CACHE_SHIFT
;
701 dprintk("%s enter, %Zu@%lld\n", __func__
, count
, offset
);
703 if (header
->dreq
!= NULL
&&
704 (!IS_ALIGNED(offset
, NFS_SERVER(header
->inode
)->pnfs_blksize
) ||
705 !IS_ALIGNED(count
, NFS_SERVER(header
->inode
)->pnfs_blksize
))) {
706 dprintk("pnfsblock nonblock aligned DIO writes. Resend MDS\n");
709 /* At this point, wdata->pages is a (sequential) list of nfs_pages.
710 * We want to write each, and if there is an error set pnfs_error
711 * to have it redone using nfs.
713 par
= alloc_parallel(wdata
);
716 par
->pnfs_callback
= bl_end_par_io_write
;
717 /* At this point, have to be more careful with error handling */
719 isect
= (sector_t
) ((offset
& (long)PAGE_CACHE_MASK
) >> SECTOR_SHIFT
);
720 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
), isect
, &cow_read
);
721 if (!be
|| !is_writable(be
, isect
)) {
722 dprintk("%s no matching extents!\n", __func__
);
726 /* First page inside INVALID extent */
727 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
728 if (likely(!bl_push_one_short_extent(be
->be_inval
)))
732 temp
= offset
>> PAGE_CACHE_SHIFT
;
733 npg_zero
= do_div(temp
, npg_per_block
);
734 isect
= (sector_t
) (((offset
- npg_zero
* PAGE_CACHE_SIZE
) &
735 (long)PAGE_CACHE_MASK
) >> SECTOR_SHIFT
);
736 extent_length
= be
->be_length
- (isect
- be
->be_f_offset
);
739 dprintk("%s need to zero %d pages\n", __func__
, npg_zero
);
740 for (;npg_zero
> 0; npg_zero
--) {
741 if (bl_is_sector_init(be
->be_inval
, isect
)) {
742 dprintk("isect %llu already init\n",
743 (unsigned long long)isect
);
746 /* page ref released in bl_end_io_write_zero */
747 index
= isect
>> PAGE_CACHE_SECTOR_SHIFT
;
748 dprintk("%s zero %dth page: index %lu isect %llu\n",
749 __func__
, npg_zero
, index
,
750 (unsigned long long)isect
);
751 page
= bl_find_get_zeroing_page(header
->inode
, index
,
753 if (unlikely(IS_ERR(page
))) {
754 header
->pnfs_error
= PTR_ERR(page
);
756 } else if (page
== NULL
)
759 ret
= bl_mark_sectors_init(be
->be_inval
, isect
,
762 dprintk("%s bl_mark_sectors_init fail %d\n",
764 end_page_writeback(page
);
765 page_cache_release(page
);
766 header
->pnfs_error
= ret
;
769 if (likely(!bl_push_one_short_extent(be
->be_inval
)))
772 end_page_writeback(page
);
773 page_cache_release(page
);
774 header
->pnfs_error
= -ENOMEM
;
777 /* FIXME: This should be done in bi_end_io */
778 mark_extents_written(BLK_LSEG2EXT(header
->lseg
),
779 page
->index
<< PAGE_CACHE_SHIFT
,
782 bio
= bl_add_page_to_bio(bio
, npg_zero
, WRITE
,
784 bl_end_io_write_zero
, par
);
786 header
->pnfs_error
= PTR_ERR(bio
);
791 isect
+= PAGE_CACHE_SECTORS
;
792 extent_length
-= PAGE_CACHE_SECTORS
;
797 bio
= bl_submit_bio(WRITE
, bio
);
800 pg_index
= wdata
->args
.pgbase
>> PAGE_CACHE_SHIFT
;
801 for (i
= pg_index
; i
< wdata
->pages
.npages
; i
++) {
802 if (!extent_length
) {
803 /* We've used up the previous extent */
805 bl_put_extent(cow_read
);
806 bio
= bl_submit_bio(WRITE
, bio
);
807 /* Get the next one */
808 be
= bl_find_get_extent(BLK_LSEG2EXT(header
->lseg
),
810 if (!be
|| !is_writable(be
, isect
)) {
811 header
->pnfs_error
= -EINVAL
;
814 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
815 if (likely(!bl_push_one_short_extent(
819 header
->pnfs_error
= -ENOMEM
;
823 extent_length
= be
->be_length
-
824 (isect
- be
->be_f_offset
);
827 dprintk("%s offset %lld count %Zu\n", __func__
, offset
, count
);
828 pg_offset
= offset
& ~PAGE_CACHE_MASK
;
829 if (pg_offset
+ count
> PAGE_CACHE_SIZE
)
830 pg_len
= PAGE_CACHE_SIZE
- pg_offset
;
835 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
&&
836 !bl_is_sector_init(be
->be_inval
, isect
)) {
837 ret
= bl_read_partial_page_sync(pages
[i
], cow_read
,
838 pg_offset
, pg_len
, true);
840 dprintk("%s bl_read_partial_page_sync fail %d\n",
842 header
->pnfs_error
= ret
;
846 ret
= bl_mark_sectors_init(be
->be_inval
, isect
,
849 dprintk("%s bl_mark_sectors_init fail %d\n",
851 header
->pnfs_error
= ret
;
855 /* Expand to full page write */
857 pg_len
= PAGE_CACHE_SIZE
;
858 } else if ((pg_offset
& (SECTOR_SIZE
- 1)) ||
859 (pg_len
& (SECTOR_SIZE
- 1))){
860 /* ahh, nasty case. We have to do sync full sector
861 * read-modify-write cycles.
863 unsigned int saved_offset
= pg_offset
;
864 ret
= bl_read_partial_page_sync(pages
[i
], be
, pg_offset
,
866 pg_offset
= round_down(pg_offset
, SECTOR_SIZE
);
867 pg_len
= round_up(saved_offset
+ pg_len
, SECTOR_SIZE
)
872 bio
= do_add_page_to_bio(bio
, wdata
->pages
.npages
- i
, WRITE
,
874 bl_end_io_write
, par
,
877 header
->pnfs_error
= PTR_ERR(bio
);
883 isect
+= PAGE_CACHE_SECTORS
;
885 extent_length
-= PAGE_CACHE_SECTORS
;
888 /* Last page inside INVALID extent */
889 if (be
->be_state
== PNFS_BLOCK_INVALID_DATA
) {
890 bio
= bl_submit_bio(WRITE
, bio
);
891 temp
= last_isect
>> PAGE_CACHE_SECTOR_SHIFT
;
892 npg_zero
= npg_per_block
- do_div(temp
, npg_per_block
);
893 if (npg_zero
< npg_per_block
) {
895 goto fill_invalid_ext
;
900 wdata
->res
.count
= wdata
->args
.count
;
903 bl_put_extent(cow_read
);
904 bl_submit_bio(WRITE
, bio
);
906 return PNFS_ATTEMPTED
;
909 bl_put_extent(cow_read
);
911 return PNFS_NOT_ATTEMPTED
;
914 /* FIXME - range ignored */
916 release_extents(struct pnfs_block_layout
*bl
, struct pnfs_layout_range
*range
)
919 struct pnfs_block_extent
*be
;
921 spin_lock(&bl
->bl_ext_lock
);
922 for (i
= 0; i
< EXTENT_LISTS
; i
++) {
923 while (!list_empty(&bl
->bl_extents
[i
])) {
924 be
= list_first_entry(&bl
->bl_extents
[i
],
925 struct pnfs_block_extent
,
927 list_del(&be
->be_node
);
931 spin_unlock(&bl
->bl_ext_lock
);
935 release_inval_marks(struct pnfs_inval_markings
*marks
)
937 struct pnfs_inval_tracking
*pos
, *temp
;
938 struct pnfs_block_short_extent
*se
, *stemp
;
940 list_for_each_entry_safe(pos
, temp
, &marks
->im_tree
.mtt_stub
, it_link
) {
941 list_del(&pos
->it_link
);
945 list_for_each_entry_safe(se
, stemp
, &marks
->im_extents
, bse_node
) {
946 list_del(&se
->bse_node
);
952 static void bl_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
954 struct pnfs_block_layout
*bl
= BLK_LO2EXT(lo
);
956 dprintk("%s enter\n", __func__
);
957 release_extents(bl
, NULL
);
958 release_inval_marks(&bl
->bl_inval
);
962 static struct pnfs_layout_hdr
*bl_alloc_layout_hdr(struct inode
*inode
,
965 struct pnfs_block_layout
*bl
;
967 dprintk("%s enter\n", __func__
);
968 bl
= kzalloc(sizeof(*bl
), gfp_flags
);
971 spin_lock_init(&bl
->bl_ext_lock
);
972 INIT_LIST_HEAD(&bl
->bl_extents
[0]);
973 INIT_LIST_HEAD(&bl
->bl_extents
[1]);
974 INIT_LIST_HEAD(&bl
->bl_commit
);
975 INIT_LIST_HEAD(&bl
->bl_committing
);
977 bl
->bl_blocksize
= NFS_SERVER(inode
)->pnfs_blksize
>> SECTOR_SHIFT
;
978 BL_INIT_INVAL_MARKS(&bl
->bl_inval
, bl
->bl_blocksize
);
979 return &bl
->bl_layout
;
982 static void bl_free_lseg(struct pnfs_layout_segment
*lseg
)
984 dprintk("%s enter\n", __func__
);
988 /* We pretty much ignore lseg, and store all data layout wide, so we
989 * can correctly merge.
991 static struct pnfs_layout_segment
*bl_alloc_lseg(struct pnfs_layout_hdr
*lo
,
992 struct nfs4_layoutget_res
*lgr
,
995 struct pnfs_layout_segment
*lseg
;
998 dprintk("%s enter\n", __func__
);
999 lseg
= kzalloc(sizeof(*lseg
), gfp_flags
);
1001 return ERR_PTR(-ENOMEM
);
1002 status
= nfs4_blk_process_layoutget(lo
, lgr
, gfp_flags
);
1004 /* We don't want to call the full-blown bl_free_lseg,
1005 * since on error extents were not touched.
1008 return ERR_PTR(status
);
1014 bl_encode_layoutcommit(struct pnfs_layout_hdr
*lo
, struct xdr_stream
*xdr
,
1015 const struct nfs4_layoutcommit_args
*arg
)
1017 dprintk("%s enter\n", __func__
);
1018 encode_pnfs_block_layoutupdate(BLK_LO2EXT(lo
), xdr
, arg
);
1022 bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*lcdata
)
1024 struct pnfs_layout_hdr
*lo
= NFS_I(lcdata
->args
.inode
)->layout
;
1026 dprintk("%s enter\n", __func__
);
1027 clean_pnfs_block_layoutupdate(BLK_LO2EXT(lo
), &lcdata
->args
, lcdata
->res
.status
);
1030 static void free_blk_mountid(struct block_mount_id
*mid
)
1033 struct pnfs_block_dev
*dev
, *tmp
;
1035 /* No need to take bm_lock as we are last user freeing bm_devlist */
1036 list_for_each_entry_safe(dev
, tmp
, &mid
->bm_devlist
, bm_node
) {
1037 list_del(&dev
->bm_node
);
1038 bl_free_block_dev(dev
);
1044 /* This is mostly copied from the filelayout_get_device_info function.
1045 * It seems much of this should be at the generic pnfs level.
1047 static struct pnfs_block_dev
*
1048 nfs4_blk_get_deviceinfo(struct nfs_server
*server
, const struct nfs_fh
*fh
,
1049 struct nfs4_deviceid
*d_id
)
1051 struct pnfs_device
*dev
;
1052 struct pnfs_block_dev
*rv
;
1055 struct page
**pages
= NULL
;
1059 * Use the session max response size as the basis for setting
1060 * GETDEVICEINFO's maxcount
1062 max_resp_sz
= server
->nfs_client
->cl_session
->fc_attrs
.max_resp_sz
;
1063 max_pages
= nfs_page_array_len(0, max_resp_sz
);
1064 dprintk("%s max_resp_sz %u max_pages %d\n",
1065 __func__
, max_resp_sz
, max_pages
);
1067 dev
= kmalloc(sizeof(*dev
), GFP_NOFS
);
1069 dprintk("%s kmalloc failed\n", __func__
);
1070 return ERR_PTR(-ENOMEM
);
1073 pages
= kzalloc(max_pages
* sizeof(struct page
*), GFP_NOFS
);
1074 if (pages
== NULL
) {
1076 return ERR_PTR(-ENOMEM
);
1078 for (i
= 0; i
< max_pages
; i
++) {
1079 pages
[i
] = alloc_page(GFP_NOFS
);
1081 rv
= ERR_PTR(-ENOMEM
);
1086 memcpy(&dev
->dev_id
, d_id
, sizeof(*d_id
));
1087 dev
->layout_type
= LAYOUT_BLOCK_VOLUME
;
1090 dev
->pglen
= PAGE_SIZE
* max_pages
;
1093 dprintk("%s: dev_id: %s\n", __func__
, dev
->dev_id
.data
);
1094 rc
= nfs4_proc_getdeviceinfo(server
, dev
);
1095 dprintk("%s getdevice info returns %d\n", __func__
, rc
);
1101 rv
= nfs4_blk_decode_device(server
, dev
);
1103 for (i
= 0; i
< max_pages
; i
++)
1104 __free_page(pages
[i
]);
1111 bl_set_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*fh
)
1113 struct block_mount_id
*b_mt_id
= NULL
;
1114 struct pnfs_devicelist
*dlist
= NULL
;
1115 struct pnfs_block_dev
*bdev
;
1116 LIST_HEAD(block_disklist
);
1119 dprintk("%s enter\n", __func__
);
1121 if (server
->pnfs_blksize
== 0) {
1122 dprintk("%s Server did not return blksize\n", __func__
);
1125 b_mt_id
= kzalloc(sizeof(struct block_mount_id
), GFP_NOFS
);
1130 /* Initialize nfs4 block layout mount id */
1131 spin_lock_init(&b_mt_id
->bm_lock
);
1132 INIT_LIST_HEAD(&b_mt_id
->bm_devlist
);
1134 dlist
= kmalloc(sizeof(struct pnfs_devicelist
), GFP_NOFS
);
1140 while (!dlist
->eof
) {
1141 status
= nfs4_proc_getdevicelist(server
, fh
, dlist
);
1144 dprintk("%s GETDEVICELIST numdevs=%i, eof=%i\n",
1145 __func__
, dlist
->num_devs
, dlist
->eof
);
1146 for (i
= 0; i
< dlist
->num_devs
; i
++) {
1147 bdev
= nfs4_blk_get_deviceinfo(server
, fh
,
1150 status
= PTR_ERR(bdev
);
1153 spin_lock(&b_mt_id
->bm_lock
);
1154 list_add(&bdev
->bm_node
, &b_mt_id
->bm_devlist
);
1155 spin_unlock(&b_mt_id
->bm_lock
);
1158 dprintk("%s SUCCESS\n", __func__
);
1159 server
->pnfs_ld_data
= b_mt_id
;
1166 free_blk_mountid(b_mt_id
);
1171 bl_clear_layoutdriver(struct nfs_server
*server
)
1173 struct block_mount_id
*b_mt_id
= server
->pnfs_ld_data
;
1175 dprintk("%s enter\n", __func__
);
1176 free_blk_mountid(b_mt_id
);
1177 dprintk("%s RETURNS\n", __func__
);
1182 is_aligned_req(struct nfs_page
*req
, unsigned int alignment
)
1184 return IS_ALIGNED(req
->wb_offset
, alignment
) &&
1185 IS_ALIGNED(req
->wb_bytes
, alignment
);
1189 bl_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1191 if (pgio
->pg_dreq
!= NULL
&&
1192 !is_aligned_req(req
, SECTOR_SIZE
))
1193 nfs_pageio_reset_read_mds(pgio
);
1195 pnfs_generic_pg_init_read(pgio
, req
);
1199 bl_pg_test_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1200 struct nfs_page
*req
)
1202 if (pgio
->pg_dreq
!= NULL
&&
1203 !is_aligned_req(req
, SECTOR_SIZE
))
1206 return pnfs_generic_pg_test(pgio
, prev
, req
);
1210 * Return the number of contiguous bytes for a given inode
1211 * starting at page frame idx.
1213 static u64
pnfs_num_cont_bytes(struct inode
*inode
, pgoff_t idx
)
1215 struct address_space
*mapping
= inode
->i_mapping
;
1218 /* Optimize common case that writes from 0 to end of file */
1219 end
= DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
);
1220 if (end
!= NFS_I(inode
)->npages
) {
1222 end
= radix_tree_next_hole(&mapping
->page_tree
, idx
+ 1, ULONG_MAX
);
1227 return i_size_read(inode
) - (idx
<< PAGE_CACHE_SHIFT
);
1229 return (end
- idx
) << PAGE_CACHE_SHIFT
;
1233 bl_pg_init_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1235 if (pgio
->pg_dreq
!= NULL
&&
1236 !is_aligned_req(req
, PAGE_CACHE_SIZE
)) {
1237 nfs_pageio_reset_write_mds(pgio
);
1240 if (pgio
->pg_dreq
== NULL
)
1241 wb_size
= pnfs_num_cont_bytes(pgio
->pg_inode
,
1244 wb_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1246 pnfs_generic_pg_init_write(pgio
, req
, wb_size
);
1251 bl_pg_test_write(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
1252 struct nfs_page
*req
)
1254 if (pgio
->pg_dreq
!= NULL
&&
1255 !is_aligned_req(req
, PAGE_CACHE_SIZE
))
1258 return pnfs_generic_pg_test(pgio
, prev
, req
);
1261 static const struct nfs_pageio_ops bl_pg_read_ops
= {
1262 .pg_init
= bl_pg_init_read
,
1263 .pg_test
= bl_pg_test_read
,
1264 .pg_doio
= pnfs_generic_pg_readpages
,
1267 static const struct nfs_pageio_ops bl_pg_write_ops
= {
1268 .pg_init
= bl_pg_init_write
,
1269 .pg_test
= bl_pg_test_write
,
1270 .pg_doio
= pnfs_generic_pg_writepages
,
1273 static struct pnfs_layoutdriver_type blocklayout_type
= {
1274 .id
= LAYOUT_BLOCK_VOLUME
,
1275 .name
= "LAYOUT_BLOCK_VOLUME",
1276 .read_pagelist
= bl_read_pagelist
,
1277 .write_pagelist
= bl_write_pagelist
,
1278 .alloc_layout_hdr
= bl_alloc_layout_hdr
,
1279 .free_layout_hdr
= bl_free_layout_hdr
,
1280 .alloc_lseg
= bl_alloc_lseg
,
1281 .free_lseg
= bl_free_lseg
,
1282 .encode_layoutcommit
= bl_encode_layoutcommit
,
1283 .cleanup_layoutcommit
= bl_cleanup_layoutcommit
,
1284 .set_layoutdriver
= bl_set_layoutdriver
,
1285 .clear_layoutdriver
= bl_clear_layoutdriver
,
1286 .pg_read_ops
= &bl_pg_read_ops
,
1287 .pg_write_ops
= &bl_pg_write_ops
,
1290 static const struct rpc_pipe_ops bl_upcall_ops
= {
1291 .upcall
= rpc_pipe_generic_upcall
,
1292 .downcall
= bl_pipe_downcall
,
1293 .destroy_msg
= bl_pipe_destroy_msg
,
1296 static struct dentry
*nfs4blocklayout_register_sb(struct super_block
*sb
,
1297 struct rpc_pipe
*pipe
)
1299 struct dentry
*dir
, *dentry
;
1301 dir
= rpc_d_lookup_sb(sb
, NFS_PIPE_DIRNAME
);
1303 return ERR_PTR(-ENOENT
);
1304 dentry
= rpc_mkpipe_dentry(dir
, "blocklayout", NULL
, pipe
);
1309 static void nfs4blocklayout_unregister_sb(struct super_block
*sb
,
1310 struct rpc_pipe
*pipe
)
1313 rpc_unlink(pipe
->dentry
);
1316 static int rpc_pipefs_event(struct notifier_block
*nb
, unsigned long event
,
1319 struct super_block
*sb
= ptr
;
1320 struct net
*net
= sb
->s_fs_info
;
1321 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1322 struct dentry
*dentry
;
1325 if (!try_module_get(THIS_MODULE
))
1328 if (nn
->bl_device_pipe
== NULL
) {
1329 module_put(THIS_MODULE
);
1334 case RPC_PIPEFS_MOUNT
:
1335 dentry
= nfs4blocklayout_register_sb(sb
, nn
->bl_device_pipe
);
1336 if (IS_ERR(dentry
)) {
1337 ret
= PTR_ERR(dentry
);
1340 nn
->bl_device_pipe
->dentry
= dentry
;
1342 case RPC_PIPEFS_UMOUNT
:
1343 if (nn
->bl_device_pipe
->dentry
)
1344 nfs4blocklayout_unregister_sb(sb
, nn
->bl_device_pipe
);
1350 module_put(THIS_MODULE
);
1354 static struct notifier_block nfs4blocklayout_block
= {
1355 .notifier_call
= rpc_pipefs_event
,
1358 static struct dentry
*nfs4blocklayout_register_net(struct net
*net
,
1359 struct rpc_pipe
*pipe
)
1361 struct super_block
*pipefs_sb
;
1362 struct dentry
*dentry
;
1364 pipefs_sb
= rpc_get_sb_net(net
);
1367 dentry
= nfs4blocklayout_register_sb(pipefs_sb
, pipe
);
1368 rpc_put_sb_net(net
);
1372 static void nfs4blocklayout_unregister_net(struct net
*net
,
1373 struct rpc_pipe
*pipe
)
1375 struct super_block
*pipefs_sb
;
1377 pipefs_sb
= rpc_get_sb_net(net
);
1379 nfs4blocklayout_unregister_sb(pipefs_sb
, pipe
);
1380 rpc_put_sb_net(net
);
1384 static int nfs4blocklayout_net_init(struct net
*net
)
1386 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1387 struct dentry
*dentry
;
1389 init_waitqueue_head(&nn
->bl_wq
);
1390 nn
->bl_device_pipe
= rpc_mkpipe_data(&bl_upcall_ops
, 0);
1391 if (IS_ERR(nn
->bl_device_pipe
))
1392 return PTR_ERR(nn
->bl_device_pipe
);
1393 dentry
= nfs4blocklayout_register_net(net
, nn
->bl_device_pipe
);
1394 if (IS_ERR(dentry
)) {
1395 rpc_destroy_pipe_data(nn
->bl_device_pipe
);
1396 return PTR_ERR(dentry
);
1398 nn
->bl_device_pipe
->dentry
= dentry
;
1402 static void nfs4blocklayout_net_exit(struct net
*net
)
1404 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
1406 nfs4blocklayout_unregister_net(net
, nn
->bl_device_pipe
);
1407 rpc_destroy_pipe_data(nn
->bl_device_pipe
);
1408 nn
->bl_device_pipe
= NULL
;
1411 static struct pernet_operations nfs4blocklayout_net_ops
= {
1412 .init
= nfs4blocklayout_net_init
,
1413 .exit
= nfs4blocklayout_net_exit
,
1416 static int __init
nfs4blocklayout_init(void)
1420 dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__
);
1422 ret
= pnfs_register_layoutdriver(&blocklayout_type
);
1426 ret
= rpc_pipefs_notifier_register(&nfs4blocklayout_block
);
1429 ret
= register_pernet_subsys(&nfs4blocklayout_net_ops
);
1436 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block
);
1438 pnfs_unregister_layoutdriver(&blocklayout_type
);
1442 static void __exit
nfs4blocklayout_exit(void)
1444 dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n",
1447 rpc_pipefs_notifier_unregister(&nfs4blocklayout_block
);
1448 unregister_pernet_subsys(&nfs4blocklayout_net_ops
);
1449 pnfs_unregister_layoutdriver(&blocklayout_type
);
1452 MODULE_ALIAS("nfs-layouttype4-3");
1454 module_init(nfs4blocklayout_init
);
1455 module_exit(nfs4blocklayout_exit
);