1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/backing-dev.h>
6 #include <linux/pagemap.h>
7 #include <linux/writeback.h> /* generic_writepages */
8 #include <linux/slab.h>
9 #include <linux/pagevec.h>
10 #include <linux/task_io_accounting_ops.h>
13 #include "mds_client.h"
15 #include <linux/ceph/osd_client.h>
18 * Ceph address space ops.
20 * There are a few funny things going on here.
22 * The page->private field is used to reference a struct
23 * ceph_snap_context for _every_ dirty page. This indicates which
24 * snapshot the page was logically dirtied in, and thus which snap
25 * context needs to be associated with the osd write during writeback.
27 * Similarly, struct ceph_inode_info maintains a set of counters to
28 * count dirty pages on the inode. In the absence of snapshots,
29 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
31 * When a snapshot is taken (that is, when the client receives
32 * notification that a snapshot was taken), each inode with caps and
33 * with dirty pages (dirty pages implies there is a cap) gets a new
34 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
35 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
36 * moved to capsnap->dirty. (Unless a sync write is currently in
37 * progress. In that case, the capsnap is said to be "pending", new
38 * writes cannot start, and the capsnap isn't "finalized" until the
39 * write completes (or fails) and a final size/mtime for the inode for
40 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
42 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
43 * we look for the first capsnap in i_cap_snaps and write out pages in
44 * that snap context _only_. Then we move on to the next capsnap,
45 * eventually reaching the "live" or "head" context (i.e., pages that
46 * are not yet snapped) and are writing the most recently dirtied
49 * Invalidate and so forth must take care to ensure the dirty page
50 * accounting is preserved.
53 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
54 #define CONGESTION_OFF_THRESH(congestion_kb) \
55 (CONGESTION_ON_THRESH(congestion_kb) - \
56 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
58 static inline struct ceph_snap_context
*page_snap_context(struct page
*page
)
60 if (PagePrivate(page
))
61 return (void *)page
->private;
66 * Dirty a page. Optimistically adjust accounting, on the assumption
67 * that we won't race with invalidate. If we do, readjust.
69 static int ceph_set_page_dirty(struct page
*page
)
71 struct address_space
*mapping
= page
->mapping
;
73 struct ceph_inode_info
*ci
;
74 struct ceph_snap_context
*snapc
;
77 if (unlikely(!mapping
))
78 return !TestSetPageDirty(page
);
80 if (PageDirty(page
)) {
81 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
82 mapping
->host
, page
, page
->index
);
83 BUG_ON(!PagePrivate(page
));
87 inode
= mapping
->host
;
88 ci
= ceph_inode(inode
);
91 spin_lock(&ci
->i_ceph_lock
);
92 BUG_ON(ci
->i_wr_ref
== 0); // caller should hold Fw reference
93 if (__ceph_have_pending_cap_snap(ci
)) {
94 struct ceph_cap_snap
*capsnap
=
95 list_last_entry(&ci
->i_cap_snaps
,
98 snapc
= ceph_get_snap_context(capsnap
->context
);
99 capsnap
->dirty_pages
++;
101 BUG_ON(!ci
->i_head_snapc
);
102 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
103 ++ci
->i_wrbuffer_ref_head
;
105 if (ci
->i_wrbuffer_ref
== 0)
107 ++ci
->i_wrbuffer_ref
;
108 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
109 "snapc %p seq %lld (%d snaps)\n",
110 mapping
->host
, page
, page
->index
,
111 ci
->i_wrbuffer_ref
-1, ci
->i_wrbuffer_ref_head
-1,
112 ci
->i_wrbuffer_ref
, ci
->i_wrbuffer_ref_head
,
113 snapc
, snapc
->seq
, snapc
->num_snaps
);
114 spin_unlock(&ci
->i_ceph_lock
);
117 * Reference snap context in page->private. Also set
118 * PagePrivate so that we get invalidatepage callback.
120 BUG_ON(PagePrivate(page
));
121 page
->private = (unsigned long)snapc
;
122 SetPagePrivate(page
);
124 ret
= __set_page_dirty_nobuffers(page
);
125 WARN_ON(!PageLocked(page
));
126 WARN_ON(!page
->mapping
);
132 * If we are truncating the full page (i.e. offset == 0), adjust the
133 * dirty page counters appropriately. Only called if there is private
136 static void ceph_invalidatepage(struct page
*page
, unsigned int offset
,
140 struct ceph_inode_info
*ci
;
141 struct ceph_snap_context
*snapc
= page_snap_context(page
);
143 inode
= page
->mapping
->host
;
144 ci
= ceph_inode(inode
);
146 if (offset
!= 0 || length
!= PAGE_SIZE
) {
147 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
148 inode
, page
, page
->index
, offset
, length
);
152 ceph_invalidate_fscache_page(inode
, page
);
154 if (!PagePrivate(page
))
158 * We can get non-dirty pages here due to races between
159 * set_page_dirty and truncate_complete_page; just spit out a
160 * warning, in case we end up with accounting problems later.
162 if (!PageDirty(page
))
163 pr_err("%p invalidatepage %p page not dirty\n", inode
, page
);
165 ClearPageChecked(page
);
167 dout("%p invalidatepage %p idx %lu full dirty page\n",
168 inode
, page
, page
->index
);
170 ceph_put_wrbuffer_cap_refs(ci
, 1, snapc
);
171 ceph_put_snap_context(snapc
);
173 ClearPagePrivate(page
);
176 static int ceph_releasepage(struct page
*page
, gfp_t g
)
178 dout("%p releasepage %p idx %lu (%sdirty)\n", page
->mapping
->host
,
179 page
, page
->index
, PageDirty(page
) ? "" : "not ");
181 /* Can we release the page from the cache? */
182 if (!ceph_release_fscache_page(page
, g
))
185 return !PagePrivate(page
);
189 * read a single page, without unlocking it.
191 static int readpage_nounlock(struct file
*filp
, struct page
*page
)
193 struct inode
*inode
= file_inode(filp
);
194 struct ceph_inode_info
*ci
= ceph_inode(inode
);
195 struct ceph_osd_client
*osdc
=
196 &ceph_inode_to_client(inode
)->client
->osdc
;
198 u64 off
= page_offset(page
);
201 if (off
>= i_size_read(inode
)) {
202 zero_user_segment(page
, 0, PAGE_SIZE
);
203 SetPageUptodate(page
);
207 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
209 * Uptodate inline data should have been added
210 * into page cache while getting Fcr caps.
214 zero_user_segment(page
, 0, PAGE_SIZE
);
215 SetPageUptodate(page
);
219 err
= ceph_readpage_from_fscache(inode
, page
);
223 dout("readpage inode %p file %p page %p index %lu\n",
224 inode
, filp
, page
, page
->index
);
225 err
= ceph_osdc_readpages(osdc
, ceph_vino(inode
), &ci
->i_layout
,
227 ci
->i_truncate_seq
, ci
->i_truncate_size
,
233 ceph_fscache_readpage_cancel(inode
, page
);
237 /* zero fill remainder of page */
238 zero_user_segment(page
, err
, PAGE_SIZE
);
240 flush_dcache_page(page
);
242 SetPageUptodate(page
);
243 ceph_readpage_to_fscache(inode
, page
);
246 return err
< 0 ? err
: 0;
249 static int ceph_readpage(struct file
*filp
, struct page
*page
)
251 int r
= readpage_nounlock(filp
, page
);
257 * Finish an async read(ahead) op.
259 static void finish_read(struct ceph_osd_request
*req
)
261 struct inode
*inode
= req
->r_inode
;
262 struct ceph_osd_data
*osd_data
;
263 int rc
= req
->r_result
<= 0 ? req
->r_result
: 0;
264 int bytes
= req
->r_result
>= 0 ? req
->r_result
: 0;
268 dout("finish_read %p req %p rc %d bytes %d\n", inode
, req
, rc
, bytes
);
270 /* unlock all pages, zeroing any data we didn't read */
271 osd_data
= osd_req_op_extent_osd_data(req
, 0);
272 BUG_ON(osd_data
->type
!= CEPH_OSD_DATA_TYPE_PAGES
);
273 num_pages
= calc_pages_for((u64
)osd_data
->alignment
,
274 (u64
)osd_data
->length
);
275 for (i
= 0; i
< num_pages
; i
++) {
276 struct page
*page
= osd_data
->pages
[i
];
278 if (rc
< 0 && rc
!= -ENOENT
) {
279 ceph_fscache_readpage_cancel(inode
, page
);
282 if (bytes
< (int)PAGE_SIZE
) {
283 /* zero (remainder of) page */
284 int s
= bytes
< 0 ? 0 : bytes
;
285 zero_user_segment(page
, s
, PAGE_SIZE
);
287 dout("finish_read %p uptodate %p idx %lu\n", inode
, page
,
289 flush_dcache_page(page
);
290 SetPageUptodate(page
);
291 ceph_readpage_to_fscache(inode
, page
);
297 kfree(osd_data
->pages
);
301 * start an async read(ahead) operation. return nr_pages we submitted
302 * a read for on success, or negative error code.
304 static int start_read(struct inode
*inode
, struct list_head
*page_list
, int max
)
306 struct ceph_osd_client
*osdc
=
307 &ceph_inode_to_client(inode
)->client
->osdc
;
308 struct ceph_inode_info
*ci
= ceph_inode(inode
);
309 struct page
*page
= list_entry(page_list
->prev
, struct page
, lru
);
310 struct ceph_vino vino
;
311 struct ceph_osd_request
*req
;
321 if (!current
->journal_info
) {
322 /* caller of readpages does not hold buffer and read caps
323 * (fadvise, madvise and readahead cases) */
324 int want
= CEPH_CAP_FILE_CACHE
;
325 ret
= ceph_try_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, &got
);
327 dout("start_read %p, error getting cap\n", inode
);
328 } else if (!(got
& want
)) {
329 dout("start_read %p, no cache cap\n", inode
);
334 ceph_put_cap_refs(ci
, got
);
335 while (!list_empty(page_list
)) {
336 page
= list_entry(page_list
->prev
,
338 list_del(&page
->lru
);
345 off
= (u64
) page_offset(page
);
348 next_index
= page
->index
;
349 list_for_each_entry_reverse(page
, page_list
, lru
) {
350 if (page
->index
!= next_index
)
354 if (max
&& nr_pages
== max
)
357 len
= nr_pages
<< PAGE_SHIFT
;
358 dout("start_read %p nr_pages %d is %lld~%lld\n", inode
, nr_pages
,
360 vino
= ceph_vino(inode
);
361 req
= ceph_osdc_new_request(osdc
, &ci
->i_layout
, vino
, off
, &len
,
362 0, 1, CEPH_OSD_OP_READ
,
363 CEPH_OSD_FLAG_READ
, NULL
,
364 ci
->i_truncate_seq
, ci
->i_truncate_size
,
371 /* build page vector */
372 nr_pages
= calc_pages_for(0, len
);
373 pages
= kmalloc(sizeof(*pages
) * nr_pages
, GFP_KERNEL
);
378 for (i
= 0; i
< nr_pages
; ++i
) {
379 page
= list_entry(page_list
->prev
, struct page
, lru
);
380 BUG_ON(PageLocked(page
));
381 list_del(&page
->lru
);
383 dout("start_read %p adding %p idx %lu\n", inode
, page
,
385 if (add_to_page_cache_lru(page
, &inode
->i_data
, page
->index
,
387 ceph_fscache_uncache_page(inode
, page
);
389 dout("start_read %p add_to_page_cache failed %p\n",
393 len
= nr_pages
<< PAGE_SHIFT
;
394 osd_req_op_extent_update(req
, 0, len
);
401 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, 0, false, false);
402 req
->r_callback
= finish_read
;
403 req
->r_inode
= inode
;
405 dout("start_read %p starting %p %lld~%lld\n", inode
, req
, off
, len
);
406 ret
= ceph_osdc_start_request(osdc
, req
, false);
409 ceph_osdc_put_request(req
);
411 /* After adding locked pages to page cache, the inode holds cache cap.
412 * So we can drop our cap refs. */
414 ceph_put_cap_refs(ci
, got
);
419 for (i
= 0; i
< nr_pages
; ++i
) {
420 ceph_fscache_readpage_cancel(inode
, pages
[i
]);
421 unlock_page(pages
[i
]);
423 ceph_put_page_vector(pages
, nr_pages
, false);
425 ceph_osdc_put_request(req
);
428 ceph_put_cap_refs(ci
, got
);
434 * Read multiple pages. Leave pages we don't read + unlock in page_list;
435 * the caller (VM) cleans them up.
437 static int ceph_readpages(struct file
*file
, struct address_space
*mapping
,
438 struct list_head
*page_list
, unsigned nr_pages
)
440 struct inode
*inode
= file_inode(file
);
441 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
445 if (ceph_inode(inode
)->i_inline_version
!= CEPH_INLINE_NONE
)
448 rc
= ceph_readpages_from_fscache(mapping
->host
, mapping
, page_list
,
454 if (fsc
->mount_options
->rsize
>= PAGE_SIZE
)
455 max
= (fsc
->mount_options
->rsize
+ PAGE_SIZE
- 1)
458 dout("readpages %p file %p nr_pages %d max %d\n", inode
,
461 while (!list_empty(page_list
)) {
462 rc
= start_read(inode
, page_list
, max
);
467 ceph_fscache_readpages_cancel(inode
, page_list
);
469 dout("readpages %p file %p ret %d\n", inode
, file
, rc
);
474 * Get ref for the oldest snapc for an inode with dirty data... that is, the
475 * only snap context we are allowed to write back.
477 static struct ceph_snap_context
*get_oldest_context(struct inode
*inode
,
482 struct ceph_inode_info
*ci
= ceph_inode(inode
);
483 struct ceph_snap_context
*snapc
= NULL
;
484 struct ceph_cap_snap
*capsnap
= NULL
;
486 spin_lock(&ci
->i_ceph_lock
);
487 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
488 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap
,
489 capsnap
->context
, capsnap
->dirty_pages
);
490 if (capsnap
->dirty_pages
) {
491 snapc
= ceph_get_snap_context(capsnap
->context
);
493 *snap_size
= capsnap
->size
;
495 *truncate_size
= capsnap
->truncate_size
;
497 *truncate_seq
= capsnap
->truncate_seq
;
501 if (!snapc
&& ci
->i_wrbuffer_ref_head
) {
502 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
503 dout(" head snapc %p has %d dirty pages\n",
504 snapc
, ci
->i_wrbuffer_ref_head
);
506 *truncate_size
= ci
->i_truncate_size
;
508 *truncate_seq
= ci
->i_truncate_seq
;
510 spin_unlock(&ci
->i_ceph_lock
);
515 * Write a single page, but leave the page locked.
517 * If we get a write error, set the page error bit, but still adjust the
518 * dirty page accounting (i.e., page is no longer dirty).
520 static int writepage_nounlock(struct page
*page
, struct writeback_control
*wbc
)
523 struct ceph_inode_info
*ci
;
524 struct ceph_fs_client
*fsc
;
525 struct ceph_osd_client
*osdc
;
526 struct ceph_snap_context
*snapc
, *oldest
;
527 loff_t page_off
= page_offset(page
);
528 loff_t snap_size
= -1;
532 int err
= 0, len
= PAGE_SIZE
;
534 dout("writepage %p idx %lu\n", page
, page
->index
);
536 if (!page
->mapping
|| !page
->mapping
->host
) {
537 dout("writepage %p - no mapping\n", page
);
540 inode
= page
->mapping
->host
;
541 ci
= ceph_inode(inode
);
542 fsc
= ceph_inode_to_client(inode
);
543 osdc
= &fsc
->client
->osdc
;
545 /* verify this is a writeable snap context */
546 snapc
= page_snap_context(page
);
548 dout("writepage %p page %p not dirty?\n", inode
, page
);
551 oldest
= get_oldest_context(inode
, &snap_size
,
552 &truncate_size
, &truncate_seq
);
553 if (snapc
->seq
> oldest
->seq
) {
554 dout("writepage %p page %p snapc %p not writeable - noop\n",
556 /* we should only noop if called by kswapd */
557 WARN_ON((current
->flags
& PF_MEMALLOC
) == 0);
558 ceph_put_snap_context(oldest
);
561 ceph_put_snap_context(oldest
);
564 snap_size
= i_size_read(inode
);
566 /* is this a partial page at end of file? */
567 if (page_off
>= snap_size
) {
568 dout("%p page eof %llu\n", page
, snap_size
);
571 if (snap_size
< page_off
+ len
)
572 len
= snap_size
- page_off
;
574 dout("writepage %p page %p index %lu on %llu~%u snapc %p\n",
575 inode
, page
, page
->index
, page_off
, len
, snapc
);
577 writeback_stat
= atomic_long_inc_return(&fsc
->writeback_count
);
579 CONGESTION_ON_THRESH(fsc
->mount_options
->congestion_kb
))
580 set_bdi_congested(&fsc
->backing_dev_info
, BLK_RW_ASYNC
);
582 set_page_writeback(page
);
583 err
= ceph_osdc_writepages(osdc
, ceph_vino(inode
),
584 &ci
->i_layout
, snapc
,
586 truncate_seq
, truncate_size
,
587 &inode
->i_mtime
, &page
, 1);
589 struct writeback_control tmp_wbc
;
592 if (err
== -ERESTARTSYS
) {
593 /* killed by SIGKILL */
594 dout("writepage interrupted page %p\n", page
);
595 redirty_page_for_writepage(wbc
, page
);
596 end_page_writeback(page
);
599 dout("writepage setting page/mapping error %d %p\n",
602 mapping_set_error(&inode
->i_data
, err
);
603 wbc
->pages_skipped
++;
605 dout("writepage cleaned page %p\n", page
);
606 err
= 0; /* vfs expects us to return 0 */
609 ClearPagePrivate(page
);
610 end_page_writeback(page
);
611 ceph_put_wrbuffer_cap_refs(ci
, 1, snapc
);
612 ceph_put_snap_context(snapc
); /* page's reference */
617 static int ceph_writepage(struct page
*page
, struct writeback_control
*wbc
)
620 struct inode
*inode
= page
->mapping
->host
;
623 err
= writepage_nounlock(page
, wbc
);
624 if (err
== -ERESTARTSYS
) {
625 /* direct memory reclaimer was killed by SIGKILL. return 0
626 * to prevent caller from setting mapping/page error */
635 * lame release_pages helper. release_pages() isn't exported to
638 static void ceph_release_pages(struct page
**pages
, int num
)
643 pagevec_init(&pvec
, 0);
644 for (i
= 0; i
< num
; i
++) {
645 if (pagevec_add(&pvec
, pages
[i
]) == 0)
646 pagevec_release(&pvec
);
648 pagevec_release(&pvec
);
652 * async writeback completion handler.
654 * If we get an error, set the mapping error bit, but not the individual
657 static void writepages_finish(struct ceph_osd_request
*req
)
659 struct inode
*inode
= req
->r_inode
;
660 struct ceph_inode_info
*ci
= ceph_inode(inode
);
661 struct ceph_osd_data
*osd_data
;
663 int num_pages
, total_pages
= 0;
665 int rc
= req
->r_result
;
666 struct ceph_snap_context
*snapc
= req
->r_snapc
;
667 struct address_space
*mapping
= inode
->i_mapping
;
668 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
671 dout("writepages_finish %p rc %d\n", inode
, rc
);
673 mapping_set_error(mapping
, rc
);
676 * We lost the cache cap, need to truncate the page before
677 * it is unlocked, otherwise we'd truncate it later in the
678 * page truncation thread, possibly losing some data that
681 remove_page
= !(ceph_caps_issued(ci
) &
682 (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
));
684 /* clean all pages */
685 for (i
= 0; i
< req
->r_num_ops
; i
++) {
686 if (req
->r_ops
[i
].op
!= CEPH_OSD_OP_WRITE
)
689 osd_data
= osd_req_op_extent_osd_data(req
, i
);
690 BUG_ON(osd_data
->type
!= CEPH_OSD_DATA_TYPE_PAGES
);
691 num_pages
= calc_pages_for((u64
)osd_data
->alignment
,
692 (u64
)osd_data
->length
);
693 total_pages
+= num_pages
;
694 for (j
= 0; j
< num_pages
; j
++) {
695 page
= osd_data
->pages
[j
];
697 WARN_ON(!PageUptodate(page
));
699 if (atomic_long_dec_return(&fsc
->writeback_count
) <
700 CONGESTION_OFF_THRESH(
701 fsc
->mount_options
->congestion_kb
))
702 clear_bdi_congested(&fsc
->backing_dev_info
,
708 ceph_put_snap_context(page_snap_context(page
));
710 ClearPagePrivate(page
);
711 dout("unlocking %p\n", page
);
712 end_page_writeback(page
);
715 generic_error_remove_page(inode
->i_mapping
,
720 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
721 inode
, osd_data
->length
, rc
>= 0 ? num_pages
: 0);
723 ceph_release_pages(osd_data
->pages
, num_pages
);
726 ceph_put_wrbuffer_cap_refs(ci
, total_pages
, snapc
);
728 osd_data
= osd_req_op_extent_osd_data(req
, 0);
729 if (osd_data
->pages_from_pool
)
730 mempool_free(osd_data
->pages
,
731 ceph_sb_to_client(inode
->i_sb
)->wb_pagevec_pool
);
733 kfree(osd_data
->pages
);
734 ceph_osdc_put_request(req
);
738 * initiate async writeback
740 static int ceph_writepages_start(struct address_space
*mapping
,
741 struct writeback_control
*wbc
)
743 struct inode
*inode
= mapping
->host
;
744 struct ceph_inode_info
*ci
= ceph_inode(inode
);
745 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
746 struct ceph_vino vino
= ceph_vino(inode
);
747 pgoff_t index
, start
, end
;
750 pgoff_t max_pages
= 0, max_pages_ever
= 0;
751 struct ceph_snap_context
*snapc
= NULL
, *last_snapc
= NULL
, *pgsnapc
;
755 unsigned wsize
= 1 << inode
->i_blkbits
;
756 struct ceph_osd_request
*req
= NULL
;
758 loff_t snap_size
, i_size
;
763 * Include a 'sync' in the OSD request if this is a data
764 * integrity write (e.g., O_SYNC write or fsync()), or if our
765 * cap is being revoked.
767 if ((wbc
->sync_mode
== WB_SYNC_ALL
) ||
768 ceph_caps_revoking(ci
, CEPH_CAP_FILE_BUFFER
))
770 dout("writepages_start %p dosync=%d (mode=%s)\n",
772 wbc
->sync_mode
== WB_SYNC_NONE
? "NONE" :
773 (wbc
->sync_mode
== WB_SYNC_ALL
? "ALL" : "HOLD"));
775 if (ACCESS_ONCE(fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
) {
776 if (ci
->i_wrbuffer_ref
> 0) {
778 "writepage_start %p %lld forced umount\n",
779 inode
, ceph_ino(inode
));
781 mapping_set_error(mapping
, -EIO
);
782 return -EIO
; /* we're in a forced umount, don't write! */
784 if (fsc
->mount_options
->wsize
&& fsc
->mount_options
->wsize
< wsize
)
785 wsize
= fsc
->mount_options
->wsize
;
786 if (wsize
< PAGE_SIZE
)
788 max_pages_ever
= wsize
>> PAGE_SHIFT
;
790 pagevec_init(&pvec
, 0);
792 /* where to start/end? */
793 if (wbc
->range_cyclic
) {
794 start
= mapping
->writeback_index
; /* Start from prev offset */
796 dout(" cyclic, start at %lu\n", start
);
798 start
= wbc
->range_start
>> PAGE_SHIFT
;
799 end
= wbc
->range_end
>> PAGE_SHIFT
;
800 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
803 dout(" not cyclic, %lu to %lu\n", start
, end
);
808 /* find oldest snap context with dirty data */
809 ceph_put_snap_context(snapc
);
811 snapc
= get_oldest_context(inode
, &snap_size
,
812 &truncate_size
, &truncate_seq
);
814 /* hmm, why does writepages get called when there
816 dout(" no snap context with dirty data?\n");
819 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
820 snapc
, snapc
->seq
, snapc
->num_snaps
);
822 i_size
= i_size_read(inode
);
824 if (last_snapc
&& snapc
!= last_snapc
) {
825 /* if we switched to a newer snapc, restart our scan at the
826 * start of the original file range. */
827 dout(" snapc differs from last pass, restarting at %lu\n",
833 while (!done
&& index
<= end
) {
836 pgoff_t strip_unit_end
= 0;
837 int num_ops
= 0, op_idx
;
838 int pvec_pages
, locked_pages
= 0;
839 struct page
**pages
= NULL
, **data_pages
;
840 mempool_t
*pool
= NULL
; /* Becomes non-null if mempool used */
843 u64 offset
= 0, len
= 0;
845 max_pages
= max_pages_ever
;
849 want
= min(end
- index
,
850 min((pgoff_t
)PAGEVEC_SIZE
,
851 max_pages
- (pgoff_t
)locked_pages
) - 1)
853 pvec_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
,
856 dout("pagevec_lookup_tag got %d\n", pvec_pages
);
857 if (!pvec_pages
&& !locked_pages
)
859 for (i
= 0; i
< pvec_pages
&& locked_pages
< max_pages
; i
++) {
860 page
= pvec
.pages
[i
];
861 dout("? %p idx %lu\n", page
, page
->index
);
862 if (locked_pages
== 0)
863 lock_page(page
); /* first page */
864 else if (!trylock_page(page
))
867 /* only dirty pages, or our accounting breaks */
868 if (unlikely(!PageDirty(page
)) ||
869 unlikely(page
->mapping
!= mapping
)) {
870 dout("!dirty or !mapping %p\n", page
);
874 if (!wbc
->range_cyclic
&& page
->index
> end
) {
875 dout("end of range %p\n", page
);
880 if (strip_unit_end
&& (page
->index
> strip_unit_end
)) {
881 dout("end of strip unit %p\n", page
);
885 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
886 dout("waiting on writeback %p\n", page
);
887 wait_on_page_writeback(page
);
889 if (page_offset(page
) >=
890 (snap_size
== -1 ? i_size
: snap_size
)) {
891 dout("%p page eof %llu\n", page
,
892 (snap_size
== -1 ? i_size
: snap_size
));
897 if (PageWriteback(page
)) {
898 dout("%p under writeback\n", page
);
903 /* only if matching snap context */
904 pgsnapc
= page_snap_context(page
);
905 if (pgsnapc
->seq
> snapc
->seq
) {
906 dout("page snapc %p %lld > oldest %p %lld\n",
907 pgsnapc
, pgsnapc
->seq
, snapc
, snapc
->seq
);
910 continue; /* keep looking for snap */
914 if (!clear_page_dirty_for_io(page
)) {
915 dout("%p !clear_page_dirty_for_io\n", page
);
921 * We have something to write. If this is
922 * the first locked page this time through,
923 * calculate max possinle write size and
924 * allocate a page array
926 if (locked_pages
== 0) {
930 /* prepare async write request */
931 offset
= (u64
)page_offset(page
);
934 rc
= ceph_calc_file_object_mapping(&ci
->i_layout
,
943 num_ops
= 1 + do_sync
;
944 strip_unit_end
= page
->index
+
945 ((len
- 1) >> PAGE_SHIFT
);
948 max_pages
= calc_pages_for(0, (u64
)len
);
949 pages
= kmalloc(max_pages
* sizeof (*pages
),
952 pool
= fsc
->wb_pagevec_pool
;
953 pages
= mempool_alloc(pool
, GFP_NOFS
);
958 } else if (page
->index
!=
959 (offset
+ len
) >> PAGE_SHIFT
) {
960 if (num_ops
>= (pool
? CEPH_OSD_SLAB_OPS
:
962 redirty_page_for_writepage(wbc
, page
);
968 offset
= (u64
)page_offset(page
);
972 /* note position of first page in pvec */
975 dout("%p will write page %p idx %lu\n",
976 inode
, page
, page
->index
);
978 if (atomic_long_inc_return(&fsc
->writeback_count
) >
979 CONGESTION_ON_THRESH(
980 fsc
->mount_options
->congestion_kb
)) {
981 set_bdi_congested(&fsc
->backing_dev_info
,
985 pages
[locked_pages
] = page
;
990 /* did we get anything? */
992 goto release_pvec_pages
;
995 BUG_ON(!locked_pages
|| first
< 0);
997 if (pvec_pages
&& i
== pvec_pages
&&
998 locked_pages
< max_pages
) {
999 dout("reached end pvec, trying for more\n");
1000 pagevec_reinit(&pvec
);
1001 goto get_more_pages
;
1004 /* shift unused pages over in the pvec... we
1005 * will need to release them below. */
1006 for (j
= i
; j
< pvec_pages
; j
++) {
1007 dout(" pvec leftover page %p\n", pvec
.pages
[j
]);
1008 pvec
.pages
[j
-i
+first
] = pvec
.pages
[j
];
1014 offset
= page_offset(pages
[0]);
1017 req
= ceph_osdc_new_request(&fsc
->client
->osdc
,
1018 &ci
->i_layout
, vino
,
1019 offset
, &len
, 0, num_ops
,
1021 CEPH_OSD_FLAG_WRITE
|
1022 CEPH_OSD_FLAG_ONDISK
,
1023 snapc
, truncate_seq
,
1024 truncate_size
, false);
1026 req
= ceph_osdc_new_request(&fsc
->client
->osdc
,
1027 &ci
->i_layout
, vino
,
1032 CEPH_OSD_FLAG_WRITE
|
1033 CEPH_OSD_FLAG_ONDISK
,
1034 snapc
, truncate_seq
,
1035 truncate_size
, true);
1036 BUG_ON(IS_ERR(req
));
1038 BUG_ON(len
< page_offset(pages
[locked_pages
- 1]) +
1039 PAGE_SIZE
- offset
);
1041 req
->r_callback
= writepages_finish
;
1042 req
->r_inode
= inode
;
1044 /* Format the osd request message and submit the write */
1048 for (i
= 0; i
< locked_pages
; i
++) {
1049 u64 cur_offset
= page_offset(pages
[i
]);
1050 if (offset
+ len
!= cur_offset
) {
1051 if (op_idx
+ do_sync
+ 1 == req
->r_num_ops
)
1053 osd_req_op_extent_dup_last(req
, op_idx
,
1054 cur_offset
- offset
);
1055 dout("writepages got pages at %llu~%llu\n",
1057 osd_req_op_extent_osd_data_pages(req
, op_idx
,
1060 osd_req_op_extent_update(req
, op_idx
, len
);
1063 offset
= cur_offset
;
1064 data_pages
= pages
+ i
;
1068 set_page_writeback(pages
[i
]);
1072 if (snap_size
!= -1) {
1073 len
= min(len
, snap_size
- offset
);
1074 } else if (i
== locked_pages
) {
1075 /* writepages_finish() clears writeback pages
1076 * according to the data length, so make sure
1077 * data length covers all locked pages */
1078 u64 min_len
= len
+ 1 - PAGE_SIZE
;
1079 len
= min(len
, (u64
)i_size_read(inode
) - offset
);
1080 len
= max(len
, min_len
);
1082 dout("writepages got pages at %llu~%llu\n", offset
, len
);
1084 osd_req_op_extent_osd_data_pages(req
, op_idx
, data_pages
, len
,
1086 osd_req_op_extent_update(req
, op_idx
, len
);
1090 osd_req_op_init(req
, op_idx
, CEPH_OSD_OP_STARTSYNC
, 0);
1092 BUG_ON(op_idx
+ 1 != req
->r_num_ops
);
1095 if (i
< locked_pages
) {
1096 BUG_ON(num_ops
<= req
->r_num_ops
);
1097 num_ops
-= req
->r_num_ops
;
1101 /* allocate new pages array for next request */
1103 pages
= kmalloc(locked_pages
* sizeof (*pages
),
1106 pool
= fsc
->wb_pagevec_pool
;
1107 pages
= mempool_alloc(pool
, GFP_NOFS
);
1110 memcpy(pages
, data_pages
+ i
,
1111 locked_pages
* sizeof(*pages
));
1112 memset(data_pages
+ i
, 0,
1113 locked_pages
* sizeof(*pages
));
1115 BUG_ON(num_ops
!= req
->r_num_ops
);
1116 index
= pages
[i
- 1]->index
+ 1;
1117 /* request message now owns the pages array */
1121 req
->r_mtime
= inode
->i_mtime
;
1122 rc
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, true);
1126 wbc
->nr_to_write
-= i
;
1130 if (wbc
->nr_to_write
<= 0)
1134 dout("pagevec_release on %d pages (%p)\n", (int)pvec
.nr
,
1135 pvec
.nr
? pvec
.pages
[0] : NULL
);
1136 pagevec_release(&pvec
);
1138 if (locked_pages
&& !done
)
1142 if (should_loop
&& !done
) {
1143 /* more to do; loop back to beginning of file */
1144 dout("writepages looping back to beginning of file\n");
1150 if (wbc
->range_cyclic
|| (range_whole
&& wbc
->nr_to_write
> 0))
1151 mapping
->writeback_index
= index
;
1154 ceph_osdc_put_request(req
);
1155 ceph_put_snap_context(snapc
);
1156 dout("writepages done, rc = %d\n", rc
);
1163 * See if a given @snapc is either writeable, or already written.
1165 static int context_is_writeable_or_written(struct inode
*inode
,
1166 struct ceph_snap_context
*snapc
)
1168 struct ceph_snap_context
*oldest
= get_oldest_context(inode
, NULL
,
1170 int ret
= !oldest
|| snapc
->seq
<= oldest
->seq
;
1172 ceph_put_snap_context(oldest
);
1177 * We are only allowed to write into/dirty the page if the page is
1178 * clean, or already dirty within the same snap context.
1180 * called with page locked.
1181 * return success with page locked,
1182 * or any failure (incl -EAGAIN) with page unlocked.
1184 static int ceph_update_writeable_page(struct file
*file
,
1185 loff_t pos
, unsigned len
,
1188 struct inode
*inode
= file_inode(file
);
1189 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1190 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1191 loff_t page_off
= pos
& PAGE_MASK
;
1192 int pos_in_page
= pos
& ~PAGE_MASK
;
1193 int end_in_page
= pos_in_page
+ len
;
1196 struct ceph_snap_context
*snapc
, *oldest
;
1198 if (ACCESS_ONCE(fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
) {
1199 dout(" page %p forced umount\n", page
);
1205 /* writepages currently holds page lock, but if we change that later, */
1206 wait_on_page_writeback(page
);
1208 snapc
= page_snap_context(page
);
1209 if (snapc
&& snapc
!= ci
->i_head_snapc
) {
1211 * this page is already dirty in another (older) snap
1212 * context! is it writeable now?
1214 oldest
= get_oldest_context(inode
, NULL
, NULL
, NULL
);
1216 if (snapc
->seq
> oldest
->seq
) {
1217 ceph_put_snap_context(oldest
);
1218 dout(" page %p snapc %p not current or oldest\n",
1221 * queue for writeback, and wait for snapc to
1222 * be writeable or written
1224 snapc
= ceph_get_snap_context(snapc
);
1226 ceph_queue_writeback(inode
);
1227 r
= wait_event_killable(ci
->i_cap_wq
,
1228 context_is_writeable_or_written(inode
, snapc
));
1229 ceph_put_snap_context(snapc
);
1230 if (r
== -ERESTARTSYS
)
1234 ceph_put_snap_context(oldest
);
1236 /* yay, writeable, do it now (without dropping page lock) */
1237 dout(" page %p snapc %p not current, but oldest\n",
1239 if (!clear_page_dirty_for_io(page
))
1241 r
= writepage_nounlock(page
, NULL
);
1247 if (PageUptodate(page
)) {
1248 dout(" page %p already uptodate\n", page
);
1253 if (pos_in_page
== 0 && len
== PAGE_SIZE
)
1256 /* past end of file? */
1257 i_size
= i_size_read(inode
);
1259 if (page_off
>= i_size
||
1260 (pos_in_page
== 0 && (pos
+len
) >= i_size
&&
1261 end_in_page
- pos_in_page
!= PAGE_SIZE
)) {
1262 dout(" zeroing %p 0 - %d and %d - %d\n",
1263 page
, pos_in_page
, end_in_page
, (int)PAGE_SIZE
);
1264 zero_user_segments(page
,
1266 end_in_page
, PAGE_SIZE
);
1270 /* we need to read it. */
1271 r
= readpage_nounlock(file
, page
);
1281 * We are only allowed to write into/dirty the page if the page is
1282 * clean, or already dirty within the same snap context.
1284 static int ceph_write_begin(struct file
*file
, struct address_space
*mapping
,
1285 loff_t pos
, unsigned len
, unsigned flags
,
1286 struct page
**pagep
, void **fsdata
)
1288 struct inode
*inode
= file_inode(file
);
1290 pgoff_t index
= pos
>> PAGE_SHIFT
;
1295 page
= grab_cache_page_write_begin(mapping
, index
, 0);
1299 dout("write_begin file %p inode %p page %p %d~%d\n", file
,
1300 inode
, page
, (int)pos
, (int)len
);
1302 r
= ceph_update_writeable_page(file
, pos
, len
, page
);
1307 } while (r
== -EAGAIN
);
1313 * we don't do anything in here that simple_write_end doesn't do
1314 * except adjust dirty page accounting
1316 static int ceph_write_end(struct file
*file
, struct address_space
*mapping
,
1317 loff_t pos
, unsigned len
, unsigned copied
,
1318 struct page
*page
, void *fsdata
)
1320 struct inode
*inode
= file_inode(file
);
1323 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file
,
1324 inode
, page
, (int)pos
, (int)copied
, (int)len
);
1326 /* zero the stale part of the page if we did a short copy */
1327 if (!PageUptodate(page
)) {
1332 SetPageUptodate(page
);
1335 /* did file size increase? */
1336 if (pos
+copied
> i_size_read(inode
))
1337 check_cap
= ceph_inode_set_size(inode
, pos
+copied
);
1339 set_page_dirty(page
);
1346 ceph_check_caps(ceph_inode(inode
), CHECK_CAPS_AUTHONLY
, NULL
);
1352 * we set .direct_IO to indicate direct io is supported, but since we
1353 * intercept O_DIRECT reads and writes early, this function should
1356 static ssize_t
ceph_direct_io(struct kiocb
*iocb
, struct iov_iter
*iter
)
1362 const struct address_space_operations ceph_aops
= {
1363 .readpage
= ceph_readpage
,
1364 .readpages
= ceph_readpages
,
1365 .writepage
= ceph_writepage
,
1366 .writepages
= ceph_writepages_start
,
1367 .write_begin
= ceph_write_begin
,
1368 .write_end
= ceph_write_end
,
1369 .set_page_dirty
= ceph_set_page_dirty
,
1370 .invalidatepage
= ceph_invalidatepage
,
1371 .releasepage
= ceph_releasepage
,
1372 .direct_IO
= ceph_direct_io
,
1375 static void ceph_block_sigs(sigset_t
*oldset
)
1378 siginitsetinv(&mask
, sigmask(SIGKILL
));
1379 sigprocmask(SIG_BLOCK
, &mask
, oldset
);
1382 static void ceph_restore_sigs(sigset_t
*oldset
)
1384 sigprocmask(SIG_SETMASK
, oldset
, NULL
);
1390 static int ceph_filemap_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1392 struct inode
*inode
= file_inode(vma
->vm_file
);
1393 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1394 struct ceph_file_info
*fi
= vma
->vm_file
->private_data
;
1395 struct page
*pinned_page
= NULL
;
1396 loff_t off
= vmf
->pgoff
<< PAGE_SHIFT
;
1400 ceph_block_sigs(&oldset
);
1402 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1403 inode
, ceph_vinop(inode
), off
, (size_t)PAGE_SIZE
);
1404 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1405 want
= CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
;
1407 want
= CEPH_CAP_FILE_CACHE
;
1410 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, -1, &got
, &pinned_page
);
1414 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1415 inode
, off
, (size_t)PAGE_SIZE
, ceph_cap_string(got
));
1417 if ((got
& (CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
)) ||
1418 ci
->i_inline_version
== CEPH_INLINE_NONE
) {
1419 current
->journal_info
= vma
->vm_file
;
1420 ret
= filemap_fault(vma
, vmf
);
1421 current
->journal_info
= NULL
;
1425 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1426 inode
, off
, (size_t)PAGE_SIZE
, ceph_cap_string(got
), ret
);
1428 put_page(pinned_page
);
1429 ceph_put_cap_refs(ci
, got
);
1434 /* read inline data */
1435 if (off
>= PAGE_SIZE
) {
1436 /* does not support inline data > PAGE_SIZE */
1437 ret
= VM_FAULT_SIGBUS
;
1440 struct address_space
*mapping
= inode
->i_mapping
;
1441 struct page
*page
= find_or_create_page(mapping
, 0,
1442 mapping_gfp_constraint(mapping
,
1448 ret1
= __ceph_do_getattr(inode
, page
,
1449 CEPH_STAT_CAP_INLINE_DATA
, true);
1450 if (ret1
< 0 || off
>= i_size_read(inode
)) {
1456 ret
= VM_FAULT_SIGBUS
;
1459 if (ret1
< PAGE_SIZE
)
1460 zero_user_segment(page
, ret1
, PAGE_SIZE
);
1462 flush_dcache_page(page
);
1463 SetPageUptodate(page
);
1465 ret
= VM_FAULT_MAJOR
| VM_FAULT_LOCKED
;
1467 dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
1468 inode
, off
, (size_t)PAGE_SIZE
, ret
);
1471 ceph_restore_sigs(&oldset
);
1473 ret
= (ret
== -ENOMEM
) ? VM_FAULT_OOM
: VM_FAULT_SIGBUS
;
1479 * Reuse write_begin here for simplicity.
1481 static int ceph_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1483 struct inode
*inode
= file_inode(vma
->vm_file
);
1484 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1485 struct ceph_file_info
*fi
= vma
->vm_file
->private_data
;
1486 struct ceph_cap_flush
*prealloc_cf
;
1487 struct page
*page
= vmf
->page
;
1488 loff_t off
= page_offset(page
);
1489 loff_t size
= i_size_read(inode
);
1494 prealloc_cf
= ceph_alloc_cap_flush();
1496 return VM_FAULT_OOM
;
1498 ceph_block_sigs(&oldset
);
1500 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1501 struct page
*locked_page
= NULL
;
1506 ret
= ceph_uninline_data(vma
->vm_file
, locked_page
);
1508 unlock_page(locked_page
);
1513 if (off
+ PAGE_SIZE
<= size
)
1516 len
= size
& ~PAGE_MASK
;
1518 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1519 inode
, ceph_vinop(inode
), off
, len
, size
);
1520 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1521 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1523 want
= CEPH_CAP_FILE_BUFFER
;
1526 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, off
+ len
,
1531 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1532 inode
, off
, len
, ceph_cap_string(got
));
1534 /* Update time before taking page lock */
1535 file_update_time(vma
->vm_file
);
1540 if ((off
> size
) || (page
->mapping
!= inode
->i_mapping
)) {
1542 ret
= VM_FAULT_NOPAGE
;
1546 ret
= ceph_update_writeable_page(vma
->vm_file
, off
, len
, page
);
1548 /* success. we'll keep the page locked. */
1549 set_page_dirty(page
);
1550 ret
= VM_FAULT_LOCKED
;
1552 } while (ret
== -EAGAIN
);
1554 if (ret
== VM_FAULT_LOCKED
||
1555 ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1557 spin_lock(&ci
->i_ceph_lock
);
1558 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1559 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1561 spin_unlock(&ci
->i_ceph_lock
);
1563 __mark_inode_dirty(inode
, dirty
);
1566 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1567 inode
, off
, len
, ceph_cap_string(got
), ret
);
1568 ceph_put_cap_refs(ci
, got
);
1570 ceph_restore_sigs(&oldset
);
1571 ceph_free_cap_flush(prealloc_cf
);
1573 ret
= (ret
== -ENOMEM
) ? VM_FAULT_OOM
: VM_FAULT_SIGBUS
;
1577 void ceph_fill_inline_data(struct inode
*inode
, struct page
*locked_page
,
1578 char *data
, size_t len
)
1580 struct address_space
*mapping
= inode
->i_mapping
;
1586 if (i_size_read(inode
) == 0)
1588 page
= find_or_create_page(mapping
, 0,
1589 mapping_gfp_constraint(mapping
,
1593 if (PageUptodate(page
)) {
1600 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1601 inode
, ceph_vinop(inode
), len
, locked_page
);
1604 void *kaddr
= kmap_atomic(page
);
1605 memcpy(kaddr
, data
, len
);
1606 kunmap_atomic(kaddr
);
1609 if (page
!= locked_page
) {
1610 if (len
< PAGE_SIZE
)
1611 zero_user_segment(page
, len
, PAGE_SIZE
);
1613 flush_dcache_page(page
);
1615 SetPageUptodate(page
);
1621 int ceph_uninline_data(struct file
*filp
, struct page
*locked_page
)
1623 struct inode
*inode
= file_inode(filp
);
1624 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1625 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1626 struct ceph_osd_request
*req
;
1627 struct page
*page
= NULL
;
1628 u64 len
, inline_version
;
1630 bool from_pagecache
= false;
1632 spin_lock(&ci
->i_ceph_lock
);
1633 inline_version
= ci
->i_inline_version
;
1634 spin_unlock(&ci
->i_ceph_lock
);
1636 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1637 inode
, ceph_vinop(inode
), inline_version
);
1639 if (inline_version
== 1 || /* initial version, no data */
1640 inline_version
== CEPH_INLINE_NONE
)
1645 WARN_ON(!PageUptodate(page
));
1646 } else if (ceph_caps_issued(ci
) &
1647 (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) {
1648 page
= find_get_page(inode
->i_mapping
, 0);
1650 if (PageUptodate(page
)) {
1651 from_pagecache
= true;
1661 len
= i_size_read(inode
);
1662 if (len
> PAGE_SIZE
)
1665 page
= __page_cache_alloc(GFP_NOFS
);
1670 err
= __ceph_do_getattr(inode
, page
,
1671 CEPH_STAT_CAP_INLINE_DATA
, true);
1673 /* no inline data */
1674 if (err
== -ENODATA
)
1681 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1682 ceph_vino(inode
), 0, &len
, 0, 1,
1684 CEPH_OSD_FLAG_ONDISK
| CEPH_OSD_FLAG_WRITE
,
1691 req
->r_mtime
= inode
->i_mtime
;
1692 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1694 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1695 ceph_osdc_put_request(req
);
1699 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1700 ceph_vino(inode
), 0, &len
, 1, 3,
1702 CEPH_OSD_FLAG_ONDISK
| CEPH_OSD_FLAG_WRITE
,
1703 NULL
, ci
->i_truncate_seq
,
1704 ci
->i_truncate_size
, false);
1710 osd_req_op_extent_osd_data_pages(req
, 1, &page
, len
, 0, false, false);
1713 __le64 xattr_buf
= cpu_to_le64(inline_version
);
1714 err
= osd_req_op_xattr_init(req
, 0, CEPH_OSD_OP_CMPXATTR
,
1715 "inline_version", &xattr_buf
,
1717 CEPH_OSD_CMPXATTR_OP_GT
,
1718 CEPH_OSD_CMPXATTR_MODE_U64
);
1725 int xattr_len
= snprintf(xattr_buf
, sizeof(xattr_buf
),
1726 "%llu", inline_version
);
1727 err
= osd_req_op_xattr_init(req
, 2, CEPH_OSD_OP_SETXATTR
,
1729 xattr_buf
, xattr_len
, 0, 0);
1734 req
->r_mtime
= inode
->i_mtime
;
1735 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1737 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1739 ceph_osdc_put_request(req
);
1740 if (err
== -ECANCELED
)
1743 if (page
&& page
!= locked_page
) {
1744 if (from_pagecache
) {
1748 __free_pages(page
, 0);
1751 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1752 inode
, ceph_vinop(inode
), inline_version
, err
);
1756 static const struct vm_operations_struct ceph_vmops
= {
1757 .fault
= ceph_filemap_fault
,
1758 .page_mkwrite
= ceph_page_mkwrite
,
1761 int ceph_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1763 struct address_space
*mapping
= file
->f_mapping
;
1765 if (!mapping
->a_ops
->readpage
)
1767 file_accessed(file
);
1768 vma
->vm_ops
= &ceph_vmops
;
1777 static int __ceph_pool_perm_get(struct ceph_inode_info
*ci
,
1778 s64 pool
, struct ceph_string
*pool_ns
)
1780 struct ceph_fs_client
*fsc
= ceph_inode_to_client(&ci
->vfs_inode
);
1781 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
1782 struct ceph_osd_request
*rd_req
= NULL
, *wr_req
= NULL
;
1783 struct rb_node
**p
, *parent
;
1784 struct ceph_pool_perm
*perm
;
1785 struct page
**pages
;
1787 int err
= 0, err2
= 0, have
= 0;
1789 down_read(&mdsc
->pool_perm_rwsem
);
1790 p
= &mdsc
->pool_perm_tree
.rb_node
;
1792 perm
= rb_entry(*p
, struct ceph_pool_perm
, node
);
1793 if (pool
< perm
->pool
)
1795 else if (pool
> perm
->pool
)
1796 p
= &(*p
)->rb_right
;
1798 int ret
= ceph_compare_string(pool_ns
,
1804 p
= &(*p
)->rb_right
;
1811 up_read(&mdsc
->pool_perm_rwsem
);
1816 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1817 pool
, (int)pool_ns
->len
, pool_ns
->str
);
1819 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool
);
1821 down_write(&mdsc
->pool_perm_rwsem
);
1822 p
= &mdsc
->pool_perm_tree
.rb_node
;
1826 perm
= rb_entry(parent
, struct ceph_pool_perm
, node
);
1827 if (pool
< perm
->pool
)
1829 else if (pool
> perm
->pool
)
1830 p
= &(*p
)->rb_right
;
1832 int ret
= ceph_compare_string(pool_ns
,
1838 p
= &(*p
)->rb_right
;
1846 up_write(&mdsc
->pool_perm_rwsem
);
1850 rd_req
= ceph_osdc_alloc_request(&fsc
->client
->osdc
, NULL
,
1851 1, false, GFP_NOFS
);
1857 rd_req
->r_flags
= CEPH_OSD_FLAG_READ
;
1858 osd_req_op_init(rd_req
, 0, CEPH_OSD_OP_STAT
, 0);
1859 rd_req
->r_base_oloc
.pool
= pool
;
1861 rd_req
->r_base_oloc
.pool_ns
= ceph_get_string(pool_ns
);
1862 ceph_oid_printf(&rd_req
->r_base_oid
, "%llx.00000000", ci
->i_vino
.ino
);
1864 err
= ceph_osdc_alloc_messages(rd_req
, GFP_NOFS
);
1868 wr_req
= ceph_osdc_alloc_request(&fsc
->client
->osdc
, NULL
,
1869 1, false, GFP_NOFS
);
1875 wr_req
->r_flags
= CEPH_OSD_FLAG_WRITE
| CEPH_OSD_FLAG_ACK
;
1876 osd_req_op_init(wr_req
, 0, CEPH_OSD_OP_CREATE
, CEPH_OSD_OP_FLAG_EXCL
);
1877 ceph_oloc_copy(&wr_req
->r_base_oloc
, &rd_req
->r_base_oloc
);
1878 ceph_oid_copy(&wr_req
->r_base_oid
, &rd_req
->r_base_oid
);
1880 err
= ceph_osdc_alloc_messages(wr_req
, GFP_NOFS
);
1884 /* one page should be large enough for STAT data */
1885 pages
= ceph_alloc_page_vector(1, GFP_KERNEL
);
1886 if (IS_ERR(pages
)) {
1887 err
= PTR_ERR(pages
);
1891 osd_req_op_raw_data_in_pages(rd_req
, 0, pages
, PAGE_SIZE
,
1893 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, rd_req
, false);
1895 wr_req
->r_mtime
= ci
->vfs_inode
.i_mtime
;
1896 err2
= ceph_osdc_start_request(&fsc
->client
->osdc
, wr_req
, false);
1899 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, rd_req
);
1901 err2
= ceph_osdc_wait_request(&fsc
->client
->osdc
, wr_req
);
1903 if (err
>= 0 || err
== -ENOENT
)
1905 else if (err
!= -EPERM
)
1908 if (err2
== 0 || err2
== -EEXIST
)
1910 else if (err2
!= -EPERM
) {
1915 pool_ns_len
= pool_ns
? pool_ns
->len
: 0;
1916 perm
= kmalloc(sizeof(*perm
) + pool_ns_len
+ 1, GFP_NOFS
);
1924 perm
->pool_ns_len
= pool_ns_len
;
1925 if (pool_ns_len
> 0)
1926 memcpy(perm
->pool_ns
, pool_ns
->str
, pool_ns_len
);
1927 perm
->pool_ns
[pool_ns_len
] = 0;
1929 rb_link_node(&perm
->node
, parent
, p
);
1930 rb_insert_color(&perm
->node
, &mdsc
->pool_perm_tree
);
1933 up_write(&mdsc
->pool_perm_rwsem
);
1935 ceph_osdc_put_request(rd_req
);
1936 ceph_osdc_put_request(wr_req
);
1941 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1942 pool
, (int)pool_ns
->len
, pool_ns
->str
, err
);
1944 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool
, err
);
1948 int ceph_pool_perm_check(struct ceph_inode_info
*ci
, int need
)
1951 struct ceph_string
*pool_ns
;
1954 if (ci
->i_vino
.snap
!= CEPH_NOSNAP
) {
1956 * Pool permission check needs to write to the first object.
1957 * But for snapshot, head of the first object may have alread
1958 * been deleted. Skip check to avoid creating orphan object.
1963 if (ceph_test_mount_opt(ceph_inode_to_client(&ci
->vfs_inode
),
1967 spin_lock(&ci
->i_ceph_lock
);
1968 flags
= ci
->i_ceph_flags
;
1969 pool
= ci
->i_layout
.pool_id
;
1970 spin_unlock(&ci
->i_ceph_lock
);
1972 if (flags
& CEPH_I_POOL_PERM
) {
1973 if ((need
& CEPH_CAP_FILE_RD
) && !(flags
& CEPH_I_POOL_RD
)) {
1974 dout("ceph_pool_perm_check pool %lld no read perm\n",
1978 if ((need
& CEPH_CAP_FILE_WR
) && !(flags
& CEPH_I_POOL_WR
)) {
1979 dout("ceph_pool_perm_check pool %lld no write perm\n",
1986 pool_ns
= ceph_try_get_string(ci
->i_layout
.pool_ns
);
1987 ret
= __ceph_pool_perm_get(ci
, pool
, pool_ns
);
1988 ceph_put_string(pool_ns
);
1992 flags
= CEPH_I_POOL_PERM
;
1993 if (ret
& POOL_READ
)
1994 flags
|= CEPH_I_POOL_RD
;
1995 if (ret
& POOL_WRITE
)
1996 flags
|= CEPH_I_POOL_WR
;
1998 spin_lock(&ci
->i_ceph_lock
);
1999 if (pool
== ci
->i_layout
.pool_id
&&
2000 pool_ns
== rcu_dereference_raw(ci
->i_layout
.pool_ns
)) {
2001 ci
->i_ceph_flags
|= flags
;
2003 pool
= ci
->i_layout
.pool_id
;
2004 flags
= ci
->i_ceph_flags
;
2006 spin_unlock(&ci
->i_ceph_lock
);
2010 void ceph_pool_perm_destroy(struct ceph_mds_client
*mdsc
)
2012 struct ceph_pool_perm
*perm
;
2015 while (!RB_EMPTY_ROOT(&mdsc
->pool_perm_tree
)) {
2016 n
= rb_first(&mdsc
->pool_perm_tree
);
2017 perm
= rb_entry(n
, struct ceph_pool_perm
, node
);
2018 rb_erase(n
, &mdsc
->pool_perm_tree
);