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>
11 #include <linux/signal.h>
14 #include "mds_client.h"
16 #include <linux/ceph/osd_client.h>
19 * Ceph address space ops.
21 * There are a few funny things going on here.
23 * The page->private field is used to reference a struct
24 * ceph_snap_context for _every_ dirty page. This indicates which
25 * snapshot the page was logically dirtied in, and thus which snap
26 * context needs to be associated with the osd write during writeback.
28 * Similarly, struct ceph_inode_info maintains a set of counters to
29 * count dirty pages on the inode. In the absence of snapshots,
30 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
32 * When a snapshot is taken (that is, when the client receives
33 * notification that a snapshot was taken), each inode with caps and
34 * with dirty pages (dirty pages implies there is a cap) gets a new
35 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
36 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
37 * moved to capsnap->dirty. (Unless a sync write is currently in
38 * progress. In that case, the capsnap is said to be "pending", new
39 * writes cannot start, and the capsnap isn't "finalized" until the
40 * write completes (or fails) and a final size/mtime for the inode for
41 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
43 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
44 * we look for the first capsnap in i_cap_snaps and write out pages in
45 * that snap context _only_. Then we move on to the next capsnap,
46 * eventually reaching the "live" or "head" context (i.e., pages that
47 * are not yet snapped) and are writing the most recently dirtied
50 * Invalidate and so forth must take care to ensure the dirty page
51 * accounting is preserved.
54 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
55 #define CONGESTION_OFF_THRESH(congestion_kb) \
56 (CONGESTION_ON_THRESH(congestion_kb) - \
57 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
59 static inline struct ceph_snap_context
*page_snap_context(struct page
*page
)
61 if (PagePrivate(page
))
62 return (void *)page
->private;
67 * Dirty a page. Optimistically adjust accounting, on the assumption
68 * that we won't race with invalidate. If we do, readjust.
70 static int ceph_set_page_dirty(struct page
*page
)
72 struct address_space
*mapping
= page
->mapping
;
74 struct ceph_inode_info
*ci
;
75 struct ceph_snap_context
*snapc
;
78 if (unlikely(!mapping
))
79 return !TestSetPageDirty(page
);
81 if (PageDirty(page
)) {
82 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
83 mapping
->host
, page
, page
->index
);
84 BUG_ON(!PagePrivate(page
));
88 inode
= mapping
->host
;
89 ci
= ceph_inode(inode
);
92 spin_lock(&ci
->i_ceph_lock
);
93 BUG_ON(ci
->i_wr_ref
== 0); // caller should hold Fw reference
94 if (__ceph_have_pending_cap_snap(ci
)) {
95 struct ceph_cap_snap
*capsnap
=
96 list_last_entry(&ci
->i_cap_snaps
,
99 snapc
= ceph_get_snap_context(capsnap
->context
);
100 capsnap
->dirty_pages
++;
102 BUG_ON(!ci
->i_head_snapc
);
103 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
104 ++ci
->i_wrbuffer_ref_head
;
106 if (ci
->i_wrbuffer_ref
== 0)
108 ++ci
->i_wrbuffer_ref
;
109 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
110 "snapc %p seq %lld (%d snaps)\n",
111 mapping
->host
, page
, page
->index
,
112 ci
->i_wrbuffer_ref
-1, ci
->i_wrbuffer_ref_head
-1,
113 ci
->i_wrbuffer_ref
, ci
->i_wrbuffer_ref_head
,
114 snapc
, snapc
->seq
, snapc
->num_snaps
);
115 spin_unlock(&ci
->i_ceph_lock
);
118 * Reference snap context in page->private. Also set
119 * PagePrivate so that we get invalidatepage callback.
121 BUG_ON(PagePrivate(page
));
122 page
->private = (unsigned long)snapc
;
123 SetPagePrivate(page
);
125 ret
= __set_page_dirty_nobuffers(page
);
126 WARN_ON(!PageLocked(page
));
127 WARN_ON(!page
->mapping
);
133 * If we are truncating the full page (i.e. offset == 0), adjust the
134 * dirty page counters appropriately. Only called if there is private
137 static void ceph_invalidatepage(struct page
*page
, unsigned int offset
,
141 struct ceph_inode_info
*ci
;
142 struct ceph_snap_context
*snapc
= page_snap_context(page
);
144 inode
= page
->mapping
->host
;
145 ci
= ceph_inode(inode
);
147 if (offset
!= 0 || length
!= PAGE_SIZE
) {
148 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
149 inode
, page
, page
->index
, offset
, length
);
153 ceph_invalidate_fscache_page(inode
, page
);
155 if (!PagePrivate(page
))
159 * We can get non-dirty pages here due to races between
160 * set_page_dirty and truncate_complete_page; just spit out a
161 * warning, in case we end up with accounting problems later.
163 if (!PageDirty(page
))
164 pr_err("%p invalidatepage %p page not dirty\n", inode
, page
);
166 ClearPageChecked(page
);
168 dout("%p invalidatepage %p idx %lu full dirty page\n",
169 inode
, page
, page
->index
);
171 ceph_put_wrbuffer_cap_refs(ci
, 1, snapc
);
172 ceph_put_snap_context(snapc
);
174 ClearPagePrivate(page
);
177 static int ceph_releasepage(struct page
*page
, gfp_t g
)
179 dout("%p releasepage %p idx %lu (%sdirty)\n", page
->mapping
->host
,
180 page
, page
->index
, PageDirty(page
) ? "" : "not ");
182 /* Can we release the page from the cache? */
183 if (!ceph_release_fscache_page(page
, g
))
186 return !PagePrivate(page
);
190 * read a single page, without unlocking it.
192 static int ceph_do_readpage(struct file
*filp
, struct page
*page
)
194 struct inode
*inode
= file_inode(filp
);
195 struct ceph_inode_info
*ci
= ceph_inode(inode
);
196 struct ceph_osd_client
*osdc
=
197 &ceph_inode_to_client(inode
)->client
->osdc
;
199 u64 off
= page_offset(page
);
202 if (off
>= i_size_read(inode
)) {
203 zero_user_segment(page
, 0, PAGE_SIZE
);
204 SetPageUptodate(page
);
208 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
210 * Uptodate inline data should have been added
211 * into page cache while getting Fcr caps.
215 zero_user_segment(page
, 0, PAGE_SIZE
);
216 SetPageUptodate(page
);
220 err
= ceph_readpage_from_fscache(inode
, page
);
224 dout("readpage inode %p file %p page %p index %lu\n",
225 inode
, filp
, page
, page
->index
);
226 err
= ceph_osdc_readpages(osdc
, ceph_vino(inode
), &ci
->i_layout
,
228 ci
->i_truncate_seq
, ci
->i_truncate_size
,
234 ceph_fscache_readpage_cancel(inode
, page
);
238 /* zero fill remainder of page */
239 zero_user_segment(page
, err
, PAGE_SIZE
);
241 flush_dcache_page(page
);
243 SetPageUptodate(page
);
244 ceph_readpage_to_fscache(inode
, page
);
247 return err
< 0 ? err
: 0;
250 static int ceph_readpage(struct file
*filp
, struct page
*page
)
252 int r
= ceph_do_readpage(filp
, page
);
253 if (r
!= -EINPROGRESS
)
261 * Finish an async read(ahead) op.
263 static void finish_read(struct ceph_osd_request
*req
)
265 struct inode
*inode
= req
->r_inode
;
266 struct ceph_osd_data
*osd_data
;
267 int rc
= req
->r_result
<= 0 ? req
->r_result
: 0;
268 int bytes
= req
->r_result
>= 0 ? req
->r_result
: 0;
272 dout("finish_read %p req %p rc %d bytes %d\n", inode
, req
, rc
, bytes
);
274 /* unlock all pages, zeroing any data we didn't read */
275 osd_data
= osd_req_op_extent_osd_data(req
, 0);
276 BUG_ON(osd_data
->type
!= CEPH_OSD_DATA_TYPE_PAGES
);
277 num_pages
= calc_pages_for((u64
)osd_data
->alignment
,
278 (u64
)osd_data
->length
);
279 for (i
= 0; i
< num_pages
; i
++) {
280 struct page
*page
= osd_data
->pages
[i
];
282 if (rc
< 0 && rc
!= -ENOENT
) {
283 ceph_fscache_readpage_cancel(inode
, page
);
286 if (bytes
< (int)PAGE_SIZE
) {
287 /* zero (remainder of) page */
288 int s
= bytes
< 0 ? 0 : bytes
;
289 zero_user_segment(page
, s
, PAGE_SIZE
);
291 dout("finish_read %p uptodate %p idx %lu\n", inode
, page
,
293 flush_dcache_page(page
);
294 SetPageUptodate(page
);
295 ceph_readpage_to_fscache(inode
, page
);
301 kfree(osd_data
->pages
);
305 * start an async read(ahead) operation. return nr_pages we submitted
306 * a read for on success, or negative error code.
308 static int start_read(struct inode
*inode
, struct list_head
*page_list
, int max
)
310 struct ceph_osd_client
*osdc
=
311 &ceph_inode_to_client(inode
)->client
->osdc
;
312 struct ceph_inode_info
*ci
= ceph_inode(inode
);
313 struct page
*page
= list_entry(page_list
->prev
, struct page
, lru
);
314 struct ceph_vino vino
;
315 struct ceph_osd_request
*req
;
325 if (!current
->journal_info
) {
326 /* caller of readpages does not hold buffer and read caps
327 * (fadvise, madvise and readahead cases) */
328 int want
= CEPH_CAP_FILE_CACHE
;
329 ret
= ceph_try_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, &got
);
331 dout("start_read %p, error getting cap\n", inode
);
332 } else if (!(got
& want
)) {
333 dout("start_read %p, no cache cap\n", inode
);
338 ceph_put_cap_refs(ci
, got
);
339 while (!list_empty(page_list
)) {
340 page
= list_entry(page_list
->prev
,
342 list_del(&page
->lru
);
349 off
= (u64
) page_offset(page
);
352 next_index
= page
->index
;
353 list_for_each_entry_reverse(page
, page_list
, lru
) {
354 if (page
->index
!= next_index
)
358 if (max
&& nr_pages
== max
)
361 len
= nr_pages
<< PAGE_SHIFT
;
362 dout("start_read %p nr_pages %d is %lld~%lld\n", inode
, nr_pages
,
364 vino
= ceph_vino(inode
);
365 req
= ceph_osdc_new_request(osdc
, &ci
->i_layout
, vino
, off
, &len
,
366 0, 1, CEPH_OSD_OP_READ
,
367 CEPH_OSD_FLAG_READ
, NULL
,
368 ci
->i_truncate_seq
, ci
->i_truncate_size
,
375 /* build page vector */
376 nr_pages
= calc_pages_for(0, len
);
377 pages
= kmalloc(sizeof(*pages
) * nr_pages
, GFP_KERNEL
);
382 for (i
= 0; i
< nr_pages
; ++i
) {
383 page
= list_entry(page_list
->prev
, struct page
, lru
);
384 BUG_ON(PageLocked(page
));
385 list_del(&page
->lru
);
387 dout("start_read %p adding %p idx %lu\n", inode
, page
,
389 if (add_to_page_cache_lru(page
, &inode
->i_data
, page
->index
,
391 ceph_fscache_uncache_page(inode
, page
);
393 dout("start_read %p add_to_page_cache failed %p\n",
397 len
= nr_pages
<< PAGE_SHIFT
;
398 osd_req_op_extent_update(req
, 0, len
);
405 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, 0, false, false);
406 req
->r_callback
= finish_read
;
407 req
->r_inode
= inode
;
409 dout("start_read %p starting %p %lld~%lld\n", inode
, req
, off
, len
);
410 ret
= ceph_osdc_start_request(osdc
, req
, false);
413 ceph_osdc_put_request(req
);
415 /* After adding locked pages to page cache, the inode holds cache cap.
416 * So we can drop our cap refs. */
418 ceph_put_cap_refs(ci
, got
);
423 for (i
= 0; i
< nr_pages
; ++i
) {
424 ceph_fscache_readpage_cancel(inode
, pages
[i
]);
425 unlock_page(pages
[i
]);
427 ceph_put_page_vector(pages
, nr_pages
, false);
429 ceph_osdc_put_request(req
);
432 ceph_put_cap_refs(ci
, got
);
438 * Read multiple pages. Leave pages we don't read + unlock in page_list;
439 * the caller (VM) cleans them up.
441 static int ceph_readpages(struct file
*file
, struct address_space
*mapping
,
442 struct list_head
*page_list
, unsigned nr_pages
)
444 struct inode
*inode
= file_inode(file
);
445 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
449 if (ceph_inode(inode
)->i_inline_version
!= CEPH_INLINE_NONE
)
452 rc
= ceph_readpages_from_fscache(mapping
->host
, mapping
, page_list
,
458 if (fsc
->mount_options
->rsize
>= PAGE_SIZE
)
459 max
= (fsc
->mount_options
->rsize
+ PAGE_SIZE
- 1)
462 dout("readpages %p file %p nr_pages %d max %d\n", inode
,
465 while (!list_empty(page_list
)) {
466 rc
= start_read(inode
, page_list
, max
);
471 ceph_fscache_readpages_cancel(inode
, page_list
);
473 dout("readpages %p file %p ret %d\n", inode
, file
, rc
);
478 * Get ref for the oldest snapc for an inode with dirty data... that is, the
479 * only snap context we are allowed to write back.
481 static struct ceph_snap_context
*get_oldest_context(struct inode
*inode
,
486 struct ceph_inode_info
*ci
= ceph_inode(inode
);
487 struct ceph_snap_context
*snapc
= NULL
;
488 struct ceph_cap_snap
*capsnap
= NULL
;
490 spin_lock(&ci
->i_ceph_lock
);
491 list_for_each_entry(capsnap
, &ci
->i_cap_snaps
, ci_item
) {
492 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap
,
493 capsnap
->context
, capsnap
->dirty_pages
);
494 if (capsnap
->dirty_pages
) {
495 snapc
= ceph_get_snap_context(capsnap
->context
);
497 *snap_size
= capsnap
->size
;
499 *truncate_size
= capsnap
->truncate_size
;
501 *truncate_seq
= capsnap
->truncate_seq
;
505 if (!snapc
&& ci
->i_wrbuffer_ref_head
) {
506 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
507 dout(" head snapc %p has %d dirty pages\n",
508 snapc
, ci
->i_wrbuffer_ref_head
);
510 *truncate_size
= ci
->i_truncate_size
;
512 *truncate_seq
= ci
->i_truncate_seq
;
514 spin_unlock(&ci
->i_ceph_lock
);
519 * Write a single page, but leave the page locked.
521 * If we get a write error, set the page error bit, but still adjust the
522 * dirty page accounting (i.e., page is no longer dirty).
524 static int writepage_nounlock(struct page
*page
, struct writeback_control
*wbc
)
527 struct ceph_inode_info
*ci
;
528 struct ceph_fs_client
*fsc
;
529 struct ceph_osd_client
*osdc
;
530 struct ceph_snap_context
*snapc
, *oldest
;
531 loff_t page_off
= page_offset(page
);
532 loff_t snap_size
= -1;
536 int err
, len
= PAGE_SIZE
;
538 dout("writepage %p idx %lu\n", page
, page
->index
);
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
));
558 ceph_put_snap_context(oldest
);
559 redirty_page_for_writepage(wbc
, page
);
562 ceph_put_snap_context(oldest
);
565 snap_size
= i_size_read(inode
);
567 /* is this a partial page at end of file? */
568 if (page_off
>= snap_size
) {
569 dout("%p page eof %llu\n", page
, snap_size
);
573 if (snap_size
< page_off
+ len
)
574 len
= snap_size
- page_off
;
576 dout("writepage %p page %p index %lu on %llu~%u snapc %p\n",
577 inode
, page
, page
->index
, page_off
, len
, snapc
);
579 writeback_stat
= atomic_long_inc_return(&fsc
->writeback_count
);
581 CONGESTION_ON_THRESH(fsc
->mount_options
->congestion_kb
))
582 set_bdi_congested(inode_to_bdi(inode
), BLK_RW_ASYNC
);
584 set_page_writeback(page
);
585 err
= ceph_osdc_writepages(osdc
, ceph_vino(inode
),
586 &ci
->i_layout
, snapc
,
588 truncate_seq
, truncate_size
,
589 &inode
->i_mtime
, &page
, 1);
591 struct writeback_control tmp_wbc
;
594 if (err
== -ERESTARTSYS
) {
595 /* killed by SIGKILL */
596 dout("writepage interrupted page %p\n", page
);
597 redirty_page_for_writepage(wbc
, page
);
598 end_page_writeback(page
);
601 dout("writepage setting page/mapping error %d %p\n",
604 mapping_set_error(&inode
->i_data
, err
);
605 wbc
->pages_skipped
++;
607 dout("writepage cleaned page %p\n", page
);
608 err
= 0; /* vfs expects us to return 0 */
611 ClearPagePrivate(page
);
612 end_page_writeback(page
);
613 ceph_put_wrbuffer_cap_refs(ci
, 1, snapc
);
614 ceph_put_snap_context(snapc
); /* page's reference */
618 static int ceph_writepage(struct page
*page
, struct writeback_control
*wbc
)
621 struct inode
*inode
= page
->mapping
->host
;
624 err
= writepage_nounlock(page
, wbc
);
625 if (err
== -ERESTARTSYS
) {
626 /* direct memory reclaimer was killed by SIGKILL. return 0
627 * to prevent caller from setting mapping/page error */
636 * lame release_pages helper. release_pages() isn't exported to
639 static void ceph_release_pages(struct page
**pages
, int num
)
644 pagevec_init(&pvec
, 0);
645 for (i
= 0; i
< num
; i
++) {
646 if (pagevec_add(&pvec
, pages
[i
]) == 0)
647 pagevec_release(&pvec
);
649 pagevec_release(&pvec
);
653 * async writeback completion handler.
655 * If we get an error, set the mapping error bit, but not the individual
658 static void writepages_finish(struct ceph_osd_request
*req
)
660 struct inode
*inode
= req
->r_inode
;
661 struct ceph_inode_info
*ci
= ceph_inode(inode
);
662 struct ceph_osd_data
*osd_data
;
664 int num_pages
, total_pages
= 0;
666 int rc
= req
->r_result
;
667 struct ceph_snap_context
*snapc
= req
->r_snapc
;
668 struct address_space
*mapping
= inode
->i_mapping
;
669 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
672 dout("writepages_finish %p rc %d\n", inode
, rc
);
674 mapping_set_error(mapping
, rc
);
675 ceph_set_error_write(ci
);
677 ceph_clear_error_write(ci
);
681 * We lost the cache cap, need to truncate the page before
682 * it is unlocked, otherwise we'd truncate it later in the
683 * page truncation thread, possibly losing some data that
686 remove_page
= !(ceph_caps_issued(ci
) &
687 (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
));
689 /* clean all pages */
690 for (i
= 0; i
< req
->r_num_ops
; i
++) {
691 if (req
->r_ops
[i
].op
!= CEPH_OSD_OP_WRITE
)
694 osd_data
= osd_req_op_extent_osd_data(req
, i
);
695 BUG_ON(osd_data
->type
!= CEPH_OSD_DATA_TYPE_PAGES
);
696 num_pages
= calc_pages_for((u64
)osd_data
->alignment
,
697 (u64
)osd_data
->length
);
698 total_pages
+= num_pages
;
699 for (j
= 0; j
< num_pages
; j
++) {
700 page
= osd_data
->pages
[j
];
702 WARN_ON(!PageUptodate(page
));
704 if (atomic_long_dec_return(&fsc
->writeback_count
) <
705 CONGESTION_OFF_THRESH(
706 fsc
->mount_options
->congestion_kb
))
707 clear_bdi_congested(inode_to_bdi(inode
),
710 ceph_put_snap_context(page_snap_context(page
));
712 ClearPagePrivate(page
);
713 dout("unlocking %p\n", page
);
714 end_page_writeback(page
);
717 generic_error_remove_page(inode
->i_mapping
,
722 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
723 inode
, osd_data
->length
, rc
>= 0 ? num_pages
: 0);
725 ceph_release_pages(osd_data
->pages
, num_pages
);
728 ceph_put_wrbuffer_cap_refs(ci
, total_pages
, snapc
);
730 osd_data
= osd_req_op_extent_osd_data(req
, 0);
731 if (osd_data
->pages_from_pool
)
732 mempool_free(osd_data
->pages
,
733 ceph_sb_to_client(inode
->i_sb
)->wb_pagevec_pool
);
735 kfree(osd_data
->pages
);
736 ceph_osdc_put_request(req
);
740 * initiate async writeback
742 static int ceph_writepages_start(struct address_space
*mapping
,
743 struct writeback_control
*wbc
)
745 struct inode
*inode
= mapping
->host
;
746 struct ceph_inode_info
*ci
= ceph_inode(inode
);
747 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
748 struct ceph_vino vino
= ceph_vino(inode
);
749 pgoff_t index
, start
, end
;
752 pgoff_t max_pages
= 0, max_pages_ever
= 0;
753 struct ceph_snap_context
*snapc
= NULL
, *last_snapc
= NULL
, *pgsnapc
;
757 unsigned int wsize
= i_blocksize(inode
);
758 struct ceph_osd_request
*req
= NULL
;
760 loff_t snap_size
, i_size
;
765 * Include a 'sync' in the OSD request if this is a data
766 * integrity write (e.g., O_SYNC write or fsync()), or if our
767 * cap is being revoked.
769 if ((wbc
->sync_mode
== WB_SYNC_ALL
) ||
770 ceph_caps_revoking(ci
, CEPH_CAP_FILE_BUFFER
))
772 dout("writepages_start %p dosync=%d (mode=%s)\n",
774 wbc
->sync_mode
== WB_SYNC_NONE
? "NONE" :
775 (wbc
->sync_mode
== WB_SYNC_ALL
? "ALL" : "HOLD"));
777 if (READ_ONCE(fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
) {
778 if (ci
->i_wrbuffer_ref
> 0) {
780 "writepage_start %p %lld forced umount\n",
781 inode
, ceph_ino(inode
));
783 mapping_set_error(mapping
, -EIO
);
784 return -EIO
; /* we're in a forced umount, don't write! */
786 if (fsc
->mount_options
->wsize
&& fsc
->mount_options
->wsize
< wsize
)
787 wsize
= fsc
->mount_options
->wsize
;
788 if (wsize
< PAGE_SIZE
)
790 max_pages_ever
= wsize
>> PAGE_SHIFT
;
792 pagevec_init(&pvec
, 0);
794 /* where to start/end? */
795 if (wbc
->range_cyclic
) {
796 start
= mapping
->writeback_index
; /* Start from prev offset */
798 dout(" cyclic, start at %lu\n", start
);
800 start
= wbc
->range_start
>> PAGE_SHIFT
;
801 end
= wbc
->range_end
>> PAGE_SHIFT
;
802 if (wbc
->range_start
== 0 && wbc
->range_end
== LLONG_MAX
)
805 dout(" not cyclic, %lu to %lu\n", start
, end
);
810 /* find oldest snap context with dirty data */
811 ceph_put_snap_context(snapc
);
813 snapc
= get_oldest_context(inode
, &snap_size
,
814 &truncate_size
, &truncate_seq
);
816 /* hmm, why does writepages get called when there
818 dout(" no snap context with dirty data?\n");
821 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
822 snapc
, snapc
->seq
, snapc
->num_snaps
);
824 i_size
= i_size_read(inode
);
826 if (last_snapc
&& snapc
!= last_snapc
) {
827 /* if we switched to a newer snapc, restart our scan at the
828 * start of the original file range. */
829 dout(" snapc differs from last pass, restarting at %lu\n",
835 while (!done
&& index
<= end
) {
838 pgoff_t strip_unit_end
= 0;
839 int num_ops
= 0, op_idx
;
840 int pvec_pages
, locked_pages
= 0;
841 struct page
**pages
= NULL
, **data_pages
;
842 mempool_t
*pool
= NULL
; /* Becomes non-null if mempool used */
845 u64 offset
= 0, len
= 0;
847 max_pages
= max_pages_ever
;
851 want
= min(end
- index
,
852 min((pgoff_t
)PAGEVEC_SIZE
,
853 max_pages
- (pgoff_t
)locked_pages
) - 1)
855 pvec_pages
= pagevec_lookup_tag(&pvec
, mapping
, &index
,
858 dout("pagevec_lookup_tag got %d\n", pvec_pages
);
859 if (!pvec_pages
&& !locked_pages
)
861 for (i
= 0; i
< pvec_pages
&& locked_pages
< max_pages
; i
++) {
862 page
= pvec
.pages
[i
];
863 dout("? %p idx %lu\n", page
, page
->index
);
864 if (locked_pages
== 0)
865 lock_page(page
); /* first page */
866 else if (!trylock_page(page
))
869 /* only dirty pages, or our accounting breaks */
870 if (unlikely(!PageDirty(page
)) ||
871 unlikely(page
->mapping
!= mapping
)) {
872 dout("!dirty or !mapping %p\n", page
);
876 if (!wbc
->range_cyclic
&& page
->index
> end
) {
877 dout("end of range %p\n", page
);
882 if (strip_unit_end
&& (page
->index
> strip_unit_end
)) {
883 dout("end of strip unit %p\n", page
);
887 if (wbc
->sync_mode
!= WB_SYNC_NONE
) {
888 dout("waiting on writeback %p\n", page
);
889 wait_on_page_writeback(page
);
891 if (page_offset(page
) >=
892 (snap_size
== -1 ? i_size
: snap_size
)) {
893 dout("%p page eof %llu\n", page
,
894 (snap_size
== -1 ? i_size
: snap_size
));
899 if (PageWriteback(page
)) {
900 dout("%p under writeback\n", page
);
905 /* only if matching snap context */
906 pgsnapc
= page_snap_context(page
);
907 if (pgsnapc
->seq
> snapc
->seq
) {
908 dout("page snapc %p %lld > oldest %p %lld\n",
909 pgsnapc
, pgsnapc
->seq
, snapc
, snapc
->seq
);
912 continue; /* keep looking for snap */
916 if (!clear_page_dirty_for_io(page
)) {
917 dout("%p !clear_page_dirty_for_io\n", page
);
923 * We have something to write. If this is
924 * the first locked page this time through,
925 * calculate max possinle write size and
926 * allocate a page array
928 if (locked_pages
== 0) {
932 /* prepare async write request */
933 offset
= (u64
)page_offset(page
);
936 rc
= ceph_calc_file_object_mapping(&ci
->i_layout
,
945 num_ops
= 1 + do_sync
;
946 strip_unit_end
= page
->index
+
947 ((len
- 1) >> PAGE_SHIFT
);
950 max_pages
= calc_pages_for(0, (u64
)len
);
951 pages
= kmalloc(max_pages
* sizeof (*pages
),
954 pool
= fsc
->wb_pagevec_pool
;
955 pages
= mempool_alloc(pool
, GFP_NOFS
);
960 } else if (page
->index
!=
961 (offset
+ len
) >> PAGE_SHIFT
) {
962 if (num_ops
>= (pool
? CEPH_OSD_SLAB_OPS
:
964 redirty_page_for_writepage(wbc
, page
);
970 offset
= (u64
)page_offset(page
);
974 /* note position of first page in pvec */
977 dout("%p will write page %p idx %lu\n",
978 inode
, page
, page
->index
);
980 if (atomic_long_inc_return(&fsc
->writeback_count
) >
981 CONGESTION_ON_THRESH(
982 fsc
->mount_options
->congestion_kb
)) {
983 set_bdi_congested(inode_to_bdi(inode
),
987 pages
[locked_pages
] = page
;
992 /* did we get anything? */
994 goto release_pvec_pages
;
997 BUG_ON(!locked_pages
|| first
< 0);
999 if (pvec_pages
&& i
== pvec_pages
&&
1000 locked_pages
< max_pages
) {
1001 dout("reached end pvec, trying for more\n");
1002 pagevec_reinit(&pvec
);
1003 goto get_more_pages
;
1006 /* shift unused pages over in the pvec... we
1007 * will need to release them below. */
1008 for (j
= i
; j
< pvec_pages
; j
++) {
1009 dout(" pvec leftover page %p\n", pvec
.pages
[j
]);
1010 pvec
.pages
[j
-i
+first
] = pvec
.pages
[j
];
1016 offset
= page_offset(pages
[0]);
1019 req
= ceph_osdc_new_request(&fsc
->client
->osdc
,
1020 &ci
->i_layout
, vino
,
1021 offset
, &len
, 0, num_ops
,
1023 CEPH_OSD_FLAG_WRITE
,
1024 snapc
, truncate_seq
,
1025 truncate_size
, false);
1027 req
= ceph_osdc_new_request(&fsc
->client
->osdc
,
1028 &ci
->i_layout
, vino
,
1033 CEPH_OSD_FLAG_WRITE
,
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 (READ_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
= ceph_do_readpage(file
, page
);
1273 if (r
== -EINPROGRESS
)
1284 * We are only allowed to write into/dirty the page if the page is
1285 * clean, or already dirty within the same snap context.
1287 static int ceph_write_begin(struct file
*file
, struct address_space
*mapping
,
1288 loff_t pos
, unsigned len
, unsigned flags
,
1289 struct page
**pagep
, void **fsdata
)
1291 struct inode
*inode
= file_inode(file
);
1293 pgoff_t index
= pos
>> PAGE_SHIFT
;
1298 page
= grab_cache_page_write_begin(mapping
, index
, 0);
1302 dout("write_begin file %p inode %p page %p %d~%d\n", file
,
1303 inode
, page
, (int)pos
, (int)len
);
1305 r
= ceph_update_writeable_page(file
, pos
, len
, page
);
1310 } while (r
== -EAGAIN
);
1316 * we don't do anything in here that simple_write_end doesn't do
1317 * except adjust dirty page accounting
1319 static int ceph_write_end(struct file
*file
, struct address_space
*mapping
,
1320 loff_t pos
, unsigned len
, unsigned copied
,
1321 struct page
*page
, void *fsdata
)
1323 struct inode
*inode
= file_inode(file
);
1324 bool check_cap
= false;
1326 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file
,
1327 inode
, page
, (int)pos
, (int)copied
, (int)len
);
1329 /* zero the stale part of the page if we did a short copy */
1330 if (!PageUptodate(page
)) {
1335 SetPageUptodate(page
);
1338 /* did file size increase? */
1339 if (pos
+copied
> i_size_read(inode
))
1340 check_cap
= ceph_inode_set_size(inode
, pos
+copied
);
1342 set_page_dirty(page
);
1349 ceph_check_caps(ceph_inode(inode
), CHECK_CAPS_AUTHONLY
, NULL
);
1355 * we set .direct_IO to indicate direct io is supported, but since we
1356 * intercept O_DIRECT reads and writes early, this function should
1359 static ssize_t
ceph_direct_io(struct kiocb
*iocb
, struct iov_iter
*iter
)
1365 const struct address_space_operations ceph_aops
= {
1366 .readpage
= ceph_readpage
,
1367 .readpages
= ceph_readpages
,
1368 .writepage
= ceph_writepage
,
1369 .writepages
= ceph_writepages_start
,
1370 .write_begin
= ceph_write_begin
,
1371 .write_end
= ceph_write_end
,
1372 .set_page_dirty
= ceph_set_page_dirty
,
1373 .invalidatepage
= ceph_invalidatepage
,
1374 .releasepage
= ceph_releasepage
,
1375 .direct_IO
= ceph_direct_io
,
1378 static void ceph_block_sigs(sigset_t
*oldset
)
1381 siginitsetinv(&mask
, sigmask(SIGKILL
));
1382 sigprocmask(SIG_BLOCK
, &mask
, oldset
);
1385 static void ceph_restore_sigs(sigset_t
*oldset
)
1387 sigprocmask(SIG_SETMASK
, oldset
, NULL
);
1393 static int ceph_filemap_fault(struct vm_fault
*vmf
)
1395 struct vm_area_struct
*vma
= vmf
->vma
;
1396 struct inode
*inode
= file_inode(vma
->vm_file
);
1397 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1398 struct ceph_file_info
*fi
= vma
->vm_file
->private_data
;
1399 struct page
*pinned_page
= NULL
;
1400 loff_t off
= vmf
->pgoff
<< PAGE_SHIFT
;
1404 ceph_block_sigs(&oldset
);
1406 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1407 inode
, ceph_vinop(inode
), off
, (size_t)PAGE_SIZE
);
1408 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1409 want
= CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
;
1411 want
= CEPH_CAP_FILE_CACHE
;
1414 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, -1, &got
, &pinned_page
);
1418 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1419 inode
, off
, (size_t)PAGE_SIZE
, ceph_cap_string(got
));
1421 if ((got
& (CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
)) ||
1422 ci
->i_inline_version
== CEPH_INLINE_NONE
) {
1423 current
->journal_info
= vma
->vm_file
;
1424 ret
= filemap_fault(vmf
);
1425 current
->journal_info
= NULL
;
1429 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1430 inode
, off
, (size_t)PAGE_SIZE
, ceph_cap_string(got
), ret
);
1432 put_page(pinned_page
);
1433 ceph_put_cap_refs(ci
, got
);
1438 /* read inline data */
1439 if (off
>= PAGE_SIZE
) {
1440 /* does not support inline data > PAGE_SIZE */
1441 ret
= VM_FAULT_SIGBUS
;
1444 struct address_space
*mapping
= inode
->i_mapping
;
1445 struct page
*page
= find_or_create_page(mapping
, 0,
1446 mapping_gfp_constraint(mapping
,
1452 ret1
= __ceph_do_getattr(inode
, page
,
1453 CEPH_STAT_CAP_INLINE_DATA
, true);
1454 if (ret1
< 0 || off
>= i_size_read(inode
)) {
1460 ret
= VM_FAULT_SIGBUS
;
1463 if (ret1
< PAGE_SIZE
)
1464 zero_user_segment(page
, ret1
, PAGE_SIZE
);
1466 flush_dcache_page(page
);
1467 SetPageUptodate(page
);
1469 ret
= VM_FAULT_MAJOR
| VM_FAULT_LOCKED
;
1471 dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
1472 inode
, off
, (size_t)PAGE_SIZE
, ret
);
1475 ceph_restore_sigs(&oldset
);
1477 ret
= (ret
== -ENOMEM
) ? VM_FAULT_OOM
: VM_FAULT_SIGBUS
;
1483 * Reuse write_begin here for simplicity.
1485 static int ceph_page_mkwrite(struct vm_fault
*vmf
)
1487 struct vm_area_struct
*vma
= vmf
->vma
;
1488 struct inode
*inode
= file_inode(vma
->vm_file
);
1489 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1490 struct ceph_file_info
*fi
= vma
->vm_file
->private_data
;
1491 struct ceph_cap_flush
*prealloc_cf
;
1492 struct page
*page
= vmf
->page
;
1493 loff_t off
= page_offset(page
);
1494 loff_t size
= i_size_read(inode
);
1499 prealloc_cf
= ceph_alloc_cap_flush();
1501 return VM_FAULT_OOM
;
1503 ceph_block_sigs(&oldset
);
1505 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1506 struct page
*locked_page
= NULL
;
1511 ret
= ceph_uninline_data(vma
->vm_file
, locked_page
);
1513 unlock_page(locked_page
);
1518 if (off
+ PAGE_SIZE
<= size
)
1521 len
= size
& ~PAGE_MASK
;
1523 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1524 inode
, ceph_vinop(inode
), off
, len
, size
);
1525 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1526 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1528 want
= CEPH_CAP_FILE_BUFFER
;
1531 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, off
+ len
,
1536 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1537 inode
, off
, len
, ceph_cap_string(got
));
1539 /* Update time before taking page lock */
1540 file_update_time(vma
->vm_file
);
1545 if ((off
> size
) || (page
->mapping
!= inode
->i_mapping
)) {
1547 ret
= VM_FAULT_NOPAGE
;
1551 ret
= ceph_update_writeable_page(vma
->vm_file
, off
, len
, page
);
1553 /* success. we'll keep the page locked. */
1554 set_page_dirty(page
);
1555 ret
= VM_FAULT_LOCKED
;
1557 } while (ret
== -EAGAIN
);
1559 if (ret
== VM_FAULT_LOCKED
||
1560 ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1562 spin_lock(&ci
->i_ceph_lock
);
1563 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1564 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1566 spin_unlock(&ci
->i_ceph_lock
);
1568 __mark_inode_dirty(inode
, dirty
);
1571 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1572 inode
, off
, len
, ceph_cap_string(got
), ret
);
1573 ceph_put_cap_refs(ci
, got
);
1575 ceph_restore_sigs(&oldset
);
1576 ceph_free_cap_flush(prealloc_cf
);
1578 ret
= (ret
== -ENOMEM
) ? VM_FAULT_OOM
: VM_FAULT_SIGBUS
;
1582 void ceph_fill_inline_data(struct inode
*inode
, struct page
*locked_page
,
1583 char *data
, size_t len
)
1585 struct address_space
*mapping
= inode
->i_mapping
;
1591 if (i_size_read(inode
) == 0)
1593 page
= find_or_create_page(mapping
, 0,
1594 mapping_gfp_constraint(mapping
,
1598 if (PageUptodate(page
)) {
1605 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1606 inode
, ceph_vinop(inode
), len
, locked_page
);
1609 void *kaddr
= kmap_atomic(page
);
1610 memcpy(kaddr
, data
, len
);
1611 kunmap_atomic(kaddr
);
1614 if (page
!= locked_page
) {
1615 if (len
< PAGE_SIZE
)
1616 zero_user_segment(page
, len
, PAGE_SIZE
);
1618 flush_dcache_page(page
);
1620 SetPageUptodate(page
);
1626 int ceph_uninline_data(struct file
*filp
, struct page
*locked_page
)
1628 struct inode
*inode
= file_inode(filp
);
1629 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1630 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1631 struct ceph_osd_request
*req
;
1632 struct page
*page
= NULL
;
1633 u64 len
, inline_version
;
1635 bool from_pagecache
= false;
1637 spin_lock(&ci
->i_ceph_lock
);
1638 inline_version
= ci
->i_inline_version
;
1639 spin_unlock(&ci
->i_ceph_lock
);
1641 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1642 inode
, ceph_vinop(inode
), inline_version
);
1644 if (inline_version
== 1 || /* initial version, no data */
1645 inline_version
== CEPH_INLINE_NONE
)
1650 WARN_ON(!PageUptodate(page
));
1651 } else if (ceph_caps_issued(ci
) &
1652 (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) {
1653 page
= find_get_page(inode
->i_mapping
, 0);
1655 if (PageUptodate(page
)) {
1656 from_pagecache
= true;
1666 len
= i_size_read(inode
);
1667 if (len
> PAGE_SIZE
)
1670 page
= __page_cache_alloc(GFP_NOFS
);
1675 err
= __ceph_do_getattr(inode
, page
,
1676 CEPH_STAT_CAP_INLINE_DATA
, true);
1678 /* no inline data */
1679 if (err
== -ENODATA
)
1686 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1687 ceph_vino(inode
), 0, &len
, 0, 1,
1688 CEPH_OSD_OP_CREATE
, CEPH_OSD_FLAG_WRITE
,
1695 req
->r_mtime
= inode
->i_mtime
;
1696 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1698 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1699 ceph_osdc_put_request(req
);
1703 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1704 ceph_vino(inode
), 0, &len
, 1, 3,
1705 CEPH_OSD_OP_WRITE
, CEPH_OSD_FLAG_WRITE
,
1706 NULL
, ci
->i_truncate_seq
,
1707 ci
->i_truncate_size
, false);
1713 osd_req_op_extent_osd_data_pages(req
, 1, &page
, len
, 0, false, false);
1716 __le64 xattr_buf
= cpu_to_le64(inline_version
);
1717 err
= osd_req_op_xattr_init(req
, 0, CEPH_OSD_OP_CMPXATTR
,
1718 "inline_version", &xattr_buf
,
1720 CEPH_OSD_CMPXATTR_OP_GT
,
1721 CEPH_OSD_CMPXATTR_MODE_U64
);
1728 int xattr_len
= snprintf(xattr_buf
, sizeof(xattr_buf
),
1729 "%llu", inline_version
);
1730 err
= osd_req_op_xattr_init(req
, 2, CEPH_OSD_OP_SETXATTR
,
1732 xattr_buf
, xattr_len
, 0, 0);
1737 req
->r_mtime
= inode
->i_mtime
;
1738 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1740 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1742 ceph_osdc_put_request(req
);
1743 if (err
== -ECANCELED
)
1746 if (page
&& page
!= locked_page
) {
1747 if (from_pagecache
) {
1751 __free_pages(page
, 0);
1754 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1755 inode
, ceph_vinop(inode
), inline_version
, err
);
1759 static const struct vm_operations_struct ceph_vmops
= {
1760 .fault
= ceph_filemap_fault
,
1761 .page_mkwrite
= ceph_page_mkwrite
,
1764 int ceph_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1766 struct address_space
*mapping
= file
->f_mapping
;
1768 if (!mapping
->a_ops
->readpage
)
1770 file_accessed(file
);
1771 vma
->vm_ops
= &ceph_vmops
;
1780 static int __ceph_pool_perm_get(struct ceph_inode_info
*ci
,
1781 s64 pool
, struct ceph_string
*pool_ns
)
1783 struct ceph_fs_client
*fsc
= ceph_inode_to_client(&ci
->vfs_inode
);
1784 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
1785 struct ceph_osd_request
*rd_req
= NULL
, *wr_req
= NULL
;
1786 struct rb_node
**p
, *parent
;
1787 struct ceph_pool_perm
*perm
;
1788 struct page
**pages
;
1790 int err
= 0, err2
= 0, have
= 0;
1792 down_read(&mdsc
->pool_perm_rwsem
);
1793 p
= &mdsc
->pool_perm_tree
.rb_node
;
1795 perm
= rb_entry(*p
, struct ceph_pool_perm
, node
);
1796 if (pool
< perm
->pool
)
1798 else if (pool
> perm
->pool
)
1799 p
= &(*p
)->rb_right
;
1801 int ret
= ceph_compare_string(pool_ns
,
1807 p
= &(*p
)->rb_right
;
1814 up_read(&mdsc
->pool_perm_rwsem
);
1819 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1820 pool
, (int)pool_ns
->len
, pool_ns
->str
);
1822 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool
);
1824 down_write(&mdsc
->pool_perm_rwsem
);
1825 p
= &mdsc
->pool_perm_tree
.rb_node
;
1829 perm
= rb_entry(parent
, struct ceph_pool_perm
, node
);
1830 if (pool
< perm
->pool
)
1832 else if (pool
> perm
->pool
)
1833 p
= &(*p
)->rb_right
;
1835 int ret
= ceph_compare_string(pool_ns
,
1841 p
= &(*p
)->rb_right
;
1849 up_write(&mdsc
->pool_perm_rwsem
);
1853 rd_req
= ceph_osdc_alloc_request(&fsc
->client
->osdc
, NULL
,
1854 1, false, GFP_NOFS
);
1860 rd_req
->r_flags
= CEPH_OSD_FLAG_READ
;
1861 osd_req_op_init(rd_req
, 0, CEPH_OSD_OP_STAT
, 0);
1862 rd_req
->r_base_oloc
.pool
= pool
;
1864 rd_req
->r_base_oloc
.pool_ns
= ceph_get_string(pool_ns
);
1865 ceph_oid_printf(&rd_req
->r_base_oid
, "%llx.00000000", ci
->i_vino
.ino
);
1867 err
= ceph_osdc_alloc_messages(rd_req
, GFP_NOFS
);
1871 wr_req
= ceph_osdc_alloc_request(&fsc
->client
->osdc
, NULL
,
1872 1, false, GFP_NOFS
);
1878 wr_req
->r_flags
= CEPH_OSD_FLAG_WRITE
;
1879 osd_req_op_init(wr_req
, 0, CEPH_OSD_OP_CREATE
, CEPH_OSD_OP_FLAG_EXCL
);
1880 ceph_oloc_copy(&wr_req
->r_base_oloc
, &rd_req
->r_base_oloc
);
1881 ceph_oid_copy(&wr_req
->r_base_oid
, &rd_req
->r_base_oid
);
1883 err
= ceph_osdc_alloc_messages(wr_req
, GFP_NOFS
);
1887 /* one page should be large enough for STAT data */
1888 pages
= ceph_alloc_page_vector(1, GFP_KERNEL
);
1889 if (IS_ERR(pages
)) {
1890 err
= PTR_ERR(pages
);
1894 osd_req_op_raw_data_in_pages(rd_req
, 0, pages
, PAGE_SIZE
,
1896 err
= ceph_osdc_start_request(&fsc
->client
->osdc
, rd_req
, false);
1898 wr_req
->r_mtime
= ci
->vfs_inode
.i_mtime
;
1899 wr_req
->r_abort_on_full
= true;
1900 err2
= ceph_osdc_start_request(&fsc
->client
->osdc
, wr_req
, false);
1903 err
= ceph_osdc_wait_request(&fsc
->client
->osdc
, rd_req
);
1905 err2
= ceph_osdc_wait_request(&fsc
->client
->osdc
, wr_req
);
1907 if (err
>= 0 || err
== -ENOENT
)
1909 else if (err
!= -EPERM
)
1912 if (err2
== 0 || err2
== -EEXIST
)
1914 else if (err2
!= -EPERM
) {
1919 pool_ns_len
= pool_ns
? pool_ns
->len
: 0;
1920 perm
= kmalloc(sizeof(*perm
) + pool_ns_len
+ 1, GFP_NOFS
);
1928 perm
->pool_ns_len
= pool_ns_len
;
1929 if (pool_ns_len
> 0)
1930 memcpy(perm
->pool_ns
, pool_ns
->str
, pool_ns_len
);
1931 perm
->pool_ns
[pool_ns_len
] = 0;
1933 rb_link_node(&perm
->node
, parent
, p
);
1934 rb_insert_color(&perm
->node
, &mdsc
->pool_perm_tree
);
1937 up_write(&mdsc
->pool_perm_rwsem
);
1939 ceph_osdc_put_request(rd_req
);
1940 ceph_osdc_put_request(wr_req
);
1945 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1946 pool
, (int)pool_ns
->len
, pool_ns
->str
, err
);
1948 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool
, err
);
1952 int ceph_pool_perm_check(struct ceph_inode_info
*ci
, int need
)
1955 struct ceph_string
*pool_ns
;
1958 if (ci
->i_vino
.snap
!= CEPH_NOSNAP
) {
1960 * Pool permission check needs to write to the first object.
1961 * But for snapshot, head of the first object may have alread
1962 * been deleted. Skip check to avoid creating orphan object.
1967 if (ceph_test_mount_opt(ceph_inode_to_client(&ci
->vfs_inode
),
1971 spin_lock(&ci
->i_ceph_lock
);
1972 flags
= ci
->i_ceph_flags
;
1973 pool
= ci
->i_layout
.pool_id
;
1974 spin_unlock(&ci
->i_ceph_lock
);
1976 if (flags
& CEPH_I_POOL_PERM
) {
1977 if ((need
& CEPH_CAP_FILE_RD
) && !(flags
& CEPH_I_POOL_RD
)) {
1978 dout("ceph_pool_perm_check pool %lld no read perm\n",
1982 if ((need
& CEPH_CAP_FILE_WR
) && !(flags
& CEPH_I_POOL_WR
)) {
1983 dout("ceph_pool_perm_check pool %lld no write perm\n",
1990 pool_ns
= ceph_try_get_string(ci
->i_layout
.pool_ns
);
1991 ret
= __ceph_pool_perm_get(ci
, pool
, pool_ns
);
1992 ceph_put_string(pool_ns
);
1996 flags
= CEPH_I_POOL_PERM
;
1997 if (ret
& POOL_READ
)
1998 flags
|= CEPH_I_POOL_RD
;
1999 if (ret
& POOL_WRITE
)
2000 flags
|= CEPH_I_POOL_WR
;
2002 spin_lock(&ci
->i_ceph_lock
);
2003 if (pool
== ci
->i_layout
.pool_id
&&
2004 pool_ns
== rcu_dereference_raw(ci
->i_layout
.pool_ns
)) {
2005 ci
->i_ceph_flags
|= flags
;
2007 pool
= ci
->i_layout
.pool_id
;
2008 flags
= ci
->i_ceph_flags
;
2010 spin_unlock(&ci
->i_ceph_lock
);
2014 void ceph_pool_perm_destroy(struct ceph_mds_client
*mdsc
)
2016 struct ceph_pool_perm
*perm
;
2019 while (!RB_EMPTY_ROOT(&mdsc
->pool_perm_tree
)) {
2020 n
= rb_first(&mdsc
->pool_perm_tree
);
2021 perm
= rb_entry(n
, struct ceph_pool_perm
, node
);
2022 rb_erase(n
, &mdsc
->pool_perm_tree
);