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drm/i915/ibx: Ensure the HW is powered during PLL HW readout
[linux/fpc-iii.git] / fs / ceph / file.c
blobeb9028e8cfc5197ef1ea99524fcbc67d67b4df91
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/falloc.h>
11
12 #include "super.h"
13 #include "mds_client.h"
14 #include "cache.h"
15
16 /*
17 * Ceph file operations
18 *
19 * Implement basic open/close functionality, and implement
20 * read/write.
21 *
22 * We implement three modes of file I/O:
23 * - buffered uses the generic_file_aio_{read,write} helpers
24 *
25 * - synchronous is used when there is multi-client read/write
26 * sharing, avoids the page cache, and synchronously waits for an
27 * ack from the OSD.
28 *
29 * - direct io takes the variant of the sync path that references
30 * user pages directly.
31 *
32 * fsync() flushes and waits on dirty pages, but just queues metadata
33 * for writeback: since the MDS can recover size and mtime there is no
34 * need to wait for MDS acknowledgement.
35 */
36
37 /*
38 * Calculate the length sum of direct io vectors that can
39 * be combined into one page vector.
40 */
41 static size_t dio_get_pagev_size(const struct iov_iter *it)
42 {
43 const struct iovec *iov = it->iov;
44 const struct iovec *iovend = iov + it->nr_segs;
45 size_t size;
46
47 size = iov->iov_len - it->iov_offset;
48 /*
49 * An iov can be page vectored when both the current tail
50 * and the next base are page aligned.
51 */
52 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
53 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
54 size += iov->iov_len;
55 }
56 dout("dio_get_pagevlen len = %zu\n", size);
57 return size;
58 }
59
60 /*
61 * Allocate a page vector based on (@it, @nbytes).
62 * The return value is the tuple describing a page vector,
63 * that is (@pages, @page_align, @num_pages).
64 */
65 static struct page **
66 dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
67 size_t *page_align, int *num_pages)
68 {
69 struct iov_iter tmp_it = *it;
70 size_t align;
71 struct page **pages;
72 int ret = 0, idx, npages;
73
74 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
75 (PAGE_SIZE - 1);
76 npages = calc_pages_for(align, nbytes);
77 pages = kmalloc(sizeof(*pages) * npages, GFP_KERNEL);
78 if (!pages) {
79 pages = vmalloc(sizeof(*pages) * npages);
80 if (!pages)
81 return ERR_PTR(-ENOMEM);
82 }
83
84 for (idx = 0; idx < npages; ) {
85 size_t start;
86 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
87 npages - idx, &start);
88 if (ret < 0)
89 goto fail;
90
91 iov_iter_advance(&tmp_it, ret);
92 nbytes -= ret;
93 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
94 }
95
96 BUG_ON(nbytes != 0);
97 *num_pages = npages;
98 *page_align = align;
99 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
100 return pages;
101 fail:
102 ceph_put_page_vector(pages, idx, false);
103 return ERR_PTR(ret);
104 }
105
106 /*
107 * Prepare an open request. Preallocate ceph_cap to avoid an
108 * inopportune ENOMEM later.
109 */
110 static struct ceph_mds_request *
111 prepare_open_request(struct super_block *sb, int flags, int create_mode)
112 {
113 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
114 struct ceph_mds_client *mdsc = fsc->mdsc;
115 struct ceph_mds_request *req;
116 int want_auth = USE_ANY_MDS;
117 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
118
119 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
120 want_auth = USE_AUTH_MDS;
121
122 req = ceph_mdsc_create_request(mdsc, op, want_auth);
123 if (IS_ERR(req))
124 goto out;
125 req->r_fmode = ceph_flags_to_mode(flags);
126 req->r_args.open.flags = cpu_to_le32(flags);
127 req->r_args.open.mode = cpu_to_le32(create_mode);
128 out:
129 return req;
130 }
131
132 /*
133 * initialize private struct file data.
134 * if we fail, clean up by dropping fmode reference on the ceph_inode
135 */
136 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
137 {
138 struct ceph_file_info *cf;
139 int ret = 0;
140 struct ceph_inode_info *ci = ceph_inode(inode);
141 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
142 struct ceph_mds_client *mdsc = fsc->mdsc;
143
144 switch (inode->i_mode & S_IFMT) {
145 case S_IFREG:
146 /* First file open request creates the cookie, we want to keep
147 * this cookie around for the filetime of the inode as not to
148 * have to worry about fscache register / revoke / operation
149 * races.
150 *
151 * Also, if we know the operation is going to invalidate data
152 * (non readonly) just nuke the cache right away.
153 */
154 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
155 if ((fmode & CEPH_FILE_MODE_WR))
156 ceph_fscache_invalidate(inode);
157 case S_IFDIR:
158 dout("init_file %p %p 0%o (regular)\n", inode, file,
159 inode->i_mode);
160 cf = kmem_cache_alloc(ceph_file_cachep, GFP_KERNEL | __GFP_ZERO);
161 if (cf == NULL) {
162 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
163 return -ENOMEM;
164 }
165 cf->fmode = fmode;
166 cf->next_offset = 2;
167 cf->readdir_cache_idx = -1;
168 file->private_data = cf;
169 BUG_ON(inode->i_fop->release != ceph_release);
170 break;
171
172 case S_IFLNK:
173 dout("init_file %p %p 0%o (symlink)\n", inode, file,
174 inode->i_mode);
175 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
176 break;
177
178 default:
179 dout("init_file %p %p 0%o (special)\n", inode, file,
180 inode->i_mode);
181 /*
182 * we need to drop the open ref now, since we don't
183 * have .release set to ceph_release.
184 */
185 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
186 BUG_ON(inode->i_fop->release == ceph_release);
187
188 /* call the proper open fop */
189 ret = inode->i_fop->open(inode, file);
190 }
191 return ret;
192 }
193
194 /*
195 * If we already have the requisite capabilities, we can satisfy
196 * the open request locally (no need to request new caps from the
197 * MDS). We do, however, need to inform the MDS (asynchronously)
198 * if our wanted caps set expands.
199 */
200 int ceph_open(struct inode *inode, struct file *file)
201 {
202 struct ceph_inode_info *ci = ceph_inode(inode);
203 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
204 struct ceph_mds_client *mdsc = fsc->mdsc;
205 struct ceph_mds_request *req;
206 struct ceph_file_info *cf = file->private_data;
207 int err;
208 int flags, fmode, wanted;
209
210 if (cf) {
211 dout("open file %p is already opened\n", file);
212 return 0;
213 }
214
215 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
216 flags = file->f_flags & ~(O_CREAT|O_EXCL);
217 if (S_ISDIR(inode->i_mode))
218 flags = O_DIRECTORY; /* mds likes to know */
219
220 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
221 ceph_vinop(inode), file, flags, file->f_flags);
222 fmode = ceph_flags_to_mode(flags);
223 wanted = ceph_caps_for_mode(fmode);
224
225 /* snapped files are read-only */
226 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
227 return -EROFS;
228
229 /* trivially open snapdir */
230 if (ceph_snap(inode) == CEPH_SNAPDIR) {
231 spin_lock(&ci->i_ceph_lock);
232 __ceph_get_fmode(ci, fmode);
233 spin_unlock(&ci->i_ceph_lock);
234 return ceph_init_file(inode, file, fmode);
235 }
236
237 /*
238 * No need to block if we have caps on the auth MDS (for
239 * write) or any MDS (for read). Update wanted set
240 * asynchronously.
241 */
242 spin_lock(&ci->i_ceph_lock);
243 if (__ceph_is_any_real_caps(ci) &&
244 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
245 int mds_wanted = __ceph_caps_mds_wanted(ci);
246 int issued = __ceph_caps_issued(ci, NULL);
247
248 dout("open %p fmode %d want %s issued %s using existing\n",
249 inode, fmode, ceph_cap_string(wanted),
250 ceph_cap_string(issued));
251 __ceph_get_fmode(ci, fmode);
252 spin_unlock(&ci->i_ceph_lock);
253
254 /* adjust wanted? */
255 if ((issued & wanted) != wanted &&
256 (mds_wanted & wanted) != wanted &&
257 ceph_snap(inode) != CEPH_SNAPDIR)
258 ceph_check_caps(ci, 0, NULL);
259
260 return ceph_init_file(inode, file, fmode);
261 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
262 (ci->i_snap_caps & wanted) == wanted) {
263 __ceph_get_fmode(ci, fmode);
264 spin_unlock(&ci->i_ceph_lock);
265 return ceph_init_file(inode, file, fmode);
266 }
267
268 spin_unlock(&ci->i_ceph_lock);
269
270 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
271 req = prepare_open_request(inode->i_sb, flags, 0);
272 if (IS_ERR(req)) {
273 err = PTR_ERR(req);
274 goto out;
275 }
276 req->r_inode = inode;
277 ihold(inode);
278
279 req->r_num_caps = 1;
280 err = ceph_mdsc_do_request(mdsc, NULL, req);
281 if (!err)
282 err = ceph_init_file(inode, file, req->r_fmode);
283 ceph_mdsc_put_request(req);
284 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
285 out:
286 return err;
287 }
288
289
290 /*
291 * Do a lookup + open with a single request. If we get a non-existent
292 * file or symlink, return 1 so the VFS can retry.
293 */
294 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
295 struct file *file, unsigned flags, umode_t mode,
296 int *opened)
297 {
298 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
299 struct ceph_mds_client *mdsc = fsc->mdsc;
300 struct ceph_mds_request *req;
301 struct dentry *dn;
302 struct ceph_acls_info acls = {};
303 int err;
304
305 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
306 dir, dentry, dentry,
307 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
308
309 if (dentry->d_name.len > NAME_MAX)
310 return -ENAMETOOLONG;
311
312 err = ceph_init_dentry(dentry);
313 if (err < 0)
314 return err;
315
316 if (flags & O_CREAT) {
317 err = ceph_pre_init_acls(dir, &mode, &acls);
318 if (err < 0)
319 return err;
320 }
321
322 /* do the open */
323 req = prepare_open_request(dir->i_sb, flags, mode);
324 if (IS_ERR(req)) {
325 err = PTR_ERR(req);
326 goto out_acl;
327 }
328 req->r_dentry = dget(dentry);
329 req->r_num_caps = 2;
330 if (flags & O_CREAT) {
331 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
332 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
333 if (acls.pagelist) {
334 req->r_pagelist = acls.pagelist;
335 acls.pagelist = NULL;
336 }
337 }
338 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
339 err = ceph_mdsc_do_request(mdsc,
340 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
341 req);
342 err = ceph_handle_snapdir(req, dentry, err);
343 if (err)
344 goto out_req;
345
346 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
347 err = ceph_handle_notrace_create(dir, dentry);
348
349 if (d_unhashed(dentry)) {
350 dn = ceph_finish_lookup(req, dentry, err);
351 if (IS_ERR(dn))
352 err = PTR_ERR(dn);
353 } else {
354 /* we were given a hashed negative dentry */
355 dn = NULL;
356 }
357 if (err)
358 goto out_req;
359 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
360 /* make vfs retry on splice, ENOENT, or symlink */
361 dout("atomic_open finish_no_open on dn %p\n", dn);
362 err = finish_no_open(file, dn);
363 } else {
364 dout("atomic_open finish_open on dn %p\n", dn);
365 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
366 ceph_init_inode_acls(d_inode(dentry), &acls);
367 *opened |= FILE_CREATED;
368 }
369 err = finish_open(file, dentry, ceph_open, opened);
370 }
371 out_req:
372 if (!req->r_err && req->r_target_inode)
373 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
374 ceph_mdsc_put_request(req);
375 out_acl:
376 ceph_release_acls_info(&acls);
377 dout("atomic_open result=%d\n", err);
378 return err;
379 }
380
381 int ceph_release(struct inode *inode, struct file *file)
382 {
383 struct ceph_inode_info *ci = ceph_inode(inode);
384 struct ceph_file_info *cf = file->private_data;
385
386 dout("release inode %p file %p\n", inode, file);
387 ceph_put_fmode(ci, cf->fmode);
388 if (cf->last_readdir)
389 ceph_mdsc_put_request(cf->last_readdir);
390 kfree(cf->last_name);
391 kfree(cf->dir_info);
392 kmem_cache_free(ceph_file_cachep, cf);
393
394 /* wake up anyone waiting for caps on this inode */
395 wake_up_all(&ci->i_cap_wq);
396 return 0;
397 }
398
399 enum {
400 HAVE_RETRIED = 1,
401 CHECK_EOF = 2,
402 READ_INLINE = 3,
403 };
404
405 /*
406 * Read a range of bytes striped over one or more objects. Iterate over
407 * objects we stripe over. (That's not atomic, but good enough for now.)
408 *
409 * If we get a short result from the OSD, check against i_size; we need to
410 * only return a short read to the caller if we hit EOF.
411 */
412 static int striped_read(struct inode *inode,
413 u64 off, u64 len,
414 struct page **pages, int num_pages,
415 int *checkeof)
416 {
417 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
418 struct ceph_inode_info *ci = ceph_inode(inode);
419 u64 pos, this_len, left;
420 loff_t i_size;
421 int page_align, pages_left;
422 int read, ret;
423 struct page **page_pos;
424 bool hit_stripe, was_short;
425
426 /*
427 * we may need to do multiple reads. not atomic, unfortunately.
428 */
429 pos = off;
430 left = len;
431 page_pos = pages;
432 pages_left = num_pages;
433 read = 0;
434
435 more:
436 page_align = pos & ~PAGE_MASK;
437 this_len = left;
438 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
439 &ci->i_layout, pos, &this_len,
440 ci->i_truncate_seq,
441 ci->i_truncate_size,
442 page_pos, pages_left, page_align);
443 if (ret == -ENOENT)
444 ret = 0;
445 hit_stripe = this_len < left;
446 was_short = ret >= 0 && ret < this_len;
447 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
448 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
449
450 i_size = i_size_read(inode);
451 if (ret >= 0) {
452 int didpages;
453 if (was_short && (pos + ret < i_size)) {
454 int zlen = min(this_len - ret, i_size - pos - ret);
455 int zoff = (off & ~PAGE_MASK) + read + ret;
456 dout(" zero gap %llu to %llu\n",
457 pos + ret, pos + ret + zlen);
458 ceph_zero_page_vector_range(zoff, zlen, pages);
459 ret += zlen;
460 }
461
462 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
463 pos += ret;
464 read = pos - off;
465 left -= ret;
466 page_pos += didpages;
467 pages_left -= didpages;
468
469 /* hit stripe and need continue*/
470 if (left && hit_stripe && pos < i_size)
471 goto more;
472 }
473
474 if (read > 0) {
475 ret = read;
476 /* did we bounce off eof? */
477 if (pos + left > i_size)
478 *checkeof = CHECK_EOF;
479 }
480
481 dout("striped_read returns %d\n", ret);
482 return ret;
483 }
484
485 /*
486 * Completely synchronous read and write methods. Direct from __user
487 * buffer to osd, or directly to user pages (if O_DIRECT).
488 *
489 * If the read spans object boundary, just do multiple reads.
490 */
491 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
492 int *checkeof)
493 {
494 struct file *file = iocb->ki_filp;
495 struct inode *inode = file_inode(file);
496 struct page **pages;
497 u64 off = iocb->ki_pos;
498 int num_pages, ret;
499 size_t len = iov_iter_count(i);
500
501 dout("sync_read on file %p %llu~%u %s\n", file, off,
502 (unsigned)len,
503 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
504
505 if (!len)
506 return 0;
507 /*
508 * flush any page cache pages in this range. this
509 * will make concurrent normal and sync io slow,
510 * but it will at least behave sensibly when they are
511 * in sequence.
512 */
513 ret = filemap_write_and_wait_range(inode->i_mapping, off,
514 off + len);
515 if (ret < 0)
516 return ret;
517
518 num_pages = calc_pages_for(off, len);
519 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
520 if (IS_ERR(pages))
521 return PTR_ERR(pages);
522 ret = striped_read(inode, off, len, pages,
523 num_pages, checkeof);
524 if (ret > 0) {
525 int l, k = 0;
526 size_t left = ret;
527
528 while (left) {
529 size_t page_off = off & ~PAGE_MASK;
530 size_t copy = min_t(size_t, left,
531 PAGE_SIZE - page_off);
532 l = copy_page_to_iter(pages[k++], page_off, copy, i);
533 off += l;
534 left -= l;
535 if (l < copy)
536 break;
537 }
538 }
539 ceph_release_page_vector(pages, num_pages);
540
541 if (off > iocb->ki_pos) {
542 ret = off - iocb->ki_pos;
543 iocb->ki_pos = off;
544 }
545
546 dout("sync_read result %d\n", ret);
547 return ret;
548 }
549
550 struct ceph_aio_request {
551 struct kiocb *iocb;
552 size_t total_len;
553 int write;
554 int error;
555 struct list_head osd_reqs;
556 unsigned num_reqs;
557 atomic_t pending_reqs;
558 struct timespec mtime;
559 struct ceph_cap_flush *prealloc_cf;
560 };
561
562 struct ceph_aio_work {
563 struct work_struct work;
564 struct ceph_osd_request *req;
565 };
566
567 static void ceph_aio_retry_work(struct work_struct *work);
568
569 static void ceph_aio_complete(struct inode *inode,
570 struct ceph_aio_request *aio_req)
571 {
572 struct ceph_inode_info *ci = ceph_inode(inode);
573 int ret;
574
575 if (!atomic_dec_and_test(&aio_req->pending_reqs))
576 return;
577
578 ret = aio_req->error;
579 if (!ret)
580 ret = aio_req->total_len;
581
582 dout("ceph_aio_complete %p rc %d\n", inode, ret);
583
584 if (ret >= 0 && aio_req->write) {
585 int dirty;
586
587 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
588 if (endoff > i_size_read(inode)) {
589 if (ceph_inode_set_size(inode, endoff))
590 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
591 }
592
593 spin_lock(&ci->i_ceph_lock);
594 ci->i_inline_version = CEPH_INLINE_NONE;
595 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
596 &aio_req->prealloc_cf);
597 spin_unlock(&ci->i_ceph_lock);
598 if (dirty)
599 __mark_inode_dirty(inode, dirty);
600
601 }
602
603 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
604 CEPH_CAP_FILE_RD));
605
606 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
607
608 ceph_free_cap_flush(aio_req->prealloc_cf);
609 kfree(aio_req);
610 }
611
612 static void ceph_aio_complete_req(struct ceph_osd_request *req,
613 struct ceph_msg *msg)
614 {
615 int rc = req->r_result;
616 struct inode *inode = req->r_inode;
617 struct ceph_aio_request *aio_req = req->r_priv;
618 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
619 int num_pages = calc_pages_for((u64)osd_data->alignment,
620 osd_data->length);
621
622 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
623 inode, rc, osd_data->length);
624
625 if (rc == -EOLDSNAPC) {
626 struct ceph_aio_work *aio_work;
627 BUG_ON(!aio_req->write);
628
629 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
630 if (aio_work) {
631 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
632 aio_work->req = req;
633 queue_work(ceph_inode_to_client(inode)->wb_wq,
634 &aio_work->work);
635 return;
636 }
637 rc = -ENOMEM;
638 } else if (!aio_req->write) {
639 if (rc == -ENOENT)
640 rc = 0;
641 if (rc >= 0 && osd_data->length > rc) {
642 int zoff = osd_data->alignment + rc;
643 int zlen = osd_data->length - rc;
644 /*
645 * If read is satisfied by single OSD request,
646 * it can pass EOF. Otherwise read is within
647 * i_size.
648 */
649 if (aio_req->num_reqs == 1) {
650 loff_t i_size = i_size_read(inode);
651 loff_t endoff = aio_req->iocb->ki_pos + rc;
652 if (endoff < i_size)
653 zlen = min_t(size_t, zlen,
654 i_size - endoff);
655 aio_req->total_len = rc + zlen;
656 }
657
658 if (zlen > 0)
659 ceph_zero_page_vector_range(zoff, zlen,
660 osd_data->pages);
661 }
662 }
663
664 ceph_put_page_vector(osd_data->pages, num_pages, false);
665 ceph_osdc_put_request(req);
666
667 if (rc < 0)
668 cmpxchg(&aio_req->error, 0, rc);
669
670 ceph_aio_complete(inode, aio_req);
671 return;
672 }
673
674 static void ceph_aio_retry_work(struct work_struct *work)
675 {
676 struct ceph_aio_work *aio_work =
677 container_of(work, struct ceph_aio_work, work);
678 struct ceph_osd_request *orig_req = aio_work->req;
679 struct ceph_aio_request *aio_req = orig_req->r_priv;
680 struct inode *inode = orig_req->r_inode;
681 struct ceph_inode_info *ci = ceph_inode(inode);
682 struct ceph_snap_context *snapc;
683 struct ceph_osd_request *req;
684 int ret;
685
686 spin_lock(&ci->i_ceph_lock);
687 if (__ceph_have_pending_cap_snap(ci)) {
688 struct ceph_cap_snap *capsnap =
689 list_last_entry(&ci->i_cap_snaps,
690 struct ceph_cap_snap,
691 ci_item);
692 snapc = ceph_get_snap_context(capsnap->context);
693 } else {
694 BUG_ON(!ci->i_head_snapc);
695 snapc = ceph_get_snap_context(ci->i_head_snapc);
696 }
697 spin_unlock(&ci->i_ceph_lock);
698
699 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
700 false, GFP_NOFS);
701 if (!req) {
702 ret = -ENOMEM;
703 req = orig_req;
704 goto out;
705 }
706
707 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
708 CEPH_OSD_FLAG_ONDISK |
709 CEPH_OSD_FLAG_WRITE;
710 req->r_base_oloc = orig_req->r_base_oloc;
711 req->r_base_oid = orig_req->r_base_oid;
712
713 req->r_ops[0] = orig_req->r_ops[0];
714 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
715
716 ceph_osdc_build_request(req, req->r_ops[0].extent.offset,
717 snapc, CEPH_NOSNAP, &aio_req->mtime);
718
719 ceph_osdc_put_request(orig_req);
720
721 req->r_callback = ceph_aio_complete_req;
722 req->r_inode = inode;
723 req->r_priv = aio_req;
724
725 ret = ceph_osdc_start_request(req->r_osdc, req, false);
726 out:
727 if (ret < 0) {
728 BUG_ON(ret == -EOLDSNAPC);
729 req->r_result = ret;
730 ceph_aio_complete_req(req, NULL);
731 }
732
733 ceph_put_snap_context(snapc);
734 kfree(aio_work);
735 }
736
737 /*
738 * Write commit request unsafe callback, called to tell us when a
739 * request is unsafe (that is, in flight--has been handed to the
740 * messenger to send to its target osd). It is called again when
741 * we've received a response message indicating the request is
742 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
743 * is completed early (and unsuccessfully) due to a timeout or
744 * interrupt.
745 *
746 * This is used if we requested both an ACK and ONDISK commit reply
747 * from the OSD.
748 */
749 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
750 {
751 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
752
753 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
754 unsafe ? "un" : "");
755 if (unsafe) {
756 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
757 spin_lock(&ci->i_unsafe_lock);
758 list_add_tail(&req->r_unsafe_item,
759 &ci->i_unsafe_writes);
760 spin_unlock(&ci->i_unsafe_lock);
761 } else {
762 spin_lock(&ci->i_unsafe_lock);
763 list_del_init(&req->r_unsafe_item);
764 spin_unlock(&ci->i_unsafe_lock);
765 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
766 }
767 }
768
769
770 static ssize_t
771 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
772 struct ceph_snap_context *snapc,
773 struct ceph_cap_flush **pcf)
774 {
775 struct file *file = iocb->ki_filp;
776 struct inode *inode = file_inode(file);
777 struct ceph_inode_info *ci = ceph_inode(inode);
778 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
779 struct ceph_vino vino;
780 struct ceph_osd_request *req;
781 struct page **pages;
782 struct ceph_aio_request *aio_req = NULL;
783 int num_pages = 0;
784 int flags;
785 int ret;
786 struct timespec mtime = CURRENT_TIME;
787 size_t count = iov_iter_count(iter);
788 loff_t pos = iocb->ki_pos;
789 bool write = iov_iter_rw(iter) == WRITE;
790
791 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
792 return -EROFS;
793
794 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
795 (write ? "write" : "read"), file, pos, (unsigned)count);
796
797 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
798 if (ret < 0)
799 return ret;
800
801 if (write) {
802 ret = invalidate_inode_pages2_range(inode->i_mapping,
803 pos >> PAGE_CACHE_SHIFT,
804 (pos + count) >> PAGE_CACHE_SHIFT);
805 if (ret < 0)
806 dout("invalidate_inode_pages2_range returned %d\n", ret);
807
808 flags = CEPH_OSD_FLAG_ORDERSNAP |
809 CEPH_OSD_FLAG_ONDISK |
810 CEPH_OSD_FLAG_WRITE;
811 } else {
812 flags = CEPH_OSD_FLAG_READ;
813 }
814
815 while (iov_iter_count(iter) > 0) {
816 u64 size = dio_get_pagev_size(iter);
817 size_t start = 0;
818 ssize_t len;
819
820 vino = ceph_vino(inode);
821 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
822 vino, pos, &size, 0,
823 /*include a 'startsync' command*/
824 write ? 2 : 1,
825 write ? CEPH_OSD_OP_WRITE :
826 CEPH_OSD_OP_READ,
827 flags, snapc,
828 ci->i_truncate_seq,
829 ci->i_truncate_size,
830 false);
831 if (IS_ERR(req)) {
832 ret = PTR_ERR(req);
833 break;
834 }
835
836 len = size;
837 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
838 if (IS_ERR(pages)) {
839 ceph_osdc_put_request(req);
840 ret = PTR_ERR(pages);
841 break;
842 }
843
844 /*
845 * To simplify error handling, allow AIO when IO within i_size
846 * or IO can be satisfied by single OSD request.
847 */
848 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
849 (len == count || pos + count <= i_size_read(inode))) {
850 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
851 if (aio_req) {
852 aio_req->iocb = iocb;
853 aio_req->write = write;
854 INIT_LIST_HEAD(&aio_req->osd_reqs);
855 if (write) {
856 aio_req->mtime = mtime;
857 swap(aio_req->prealloc_cf, *pcf);
858 }
859 }
860 /* ignore error */
861 }
862
863 if (write) {
864 /*
865 * throw out any page cache pages in this range. this
866 * may block.
867 */
868 truncate_inode_pages_range(inode->i_mapping, pos,
869 (pos+len) | (PAGE_CACHE_SIZE - 1));
870
871 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
872 }
873
874
875 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
876 false, false);
877
878 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
879
880 if (aio_req) {
881 aio_req->total_len += len;
882 aio_req->num_reqs++;
883 atomic_inc(&aio_req->pending_reqs);
884
885 req->r_callback = ceph_aio_complete_req;
886 req->r_inode = inode;
887 req->r_priv = aio_req;
888 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
889
890 pos += len;
891 iov_iter_advance(iter, len);
892 continue;
893 }
894
895 ret = ceph_osdc_start_request(req->r_osdc, req, false);
896 if (!ret)
897 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
898
899 size = i_size_read(inode);
900 if (!write) {
901 if (ret == -ENOENT)
902 ret = 0;
903 if (ret >= 0 && ret < len && pos + ret < size) {
904 int zlen = min_t(size_t, len - ret,
905 size - pos - ret);
906 ceph_zero_page_vector_range(start + ret, zlen,
907 pages);
908 ret += zlen;
909 }
910 if (ret >= 0)
911 len = ret;
912 }
913
914 ceph_put_page_vector(pages, num_pages, false);
915
916 ceph_osdc_put_request(req);
917 if (ret < 0)
918 break;
919
920 pos += len;
921 iov_iter_advance(iter, len);
922
923 if (!write && pos >= size)
924 break;
925
926 if (write && pos > size) {
927 if (ceph_inode_set_size(inode, pos))
928 ceph_check_caps(ceph_inode(inode),
929 CHECK_CAPS_AUTHONLY,
930 NULL);
931 }
932 }
933
934 if (aio_req) {
935 if (aio_req->num_reqs == 0) {
936 kfree(aio_req);
937 return ret;
938 }
939
940 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
941 CEPH_CAP_FILE_RD);
942
943 while (!list_empty(&aio_req->osd_reqs)) {
944 req = list_first_entry(&aio_req->osd_reqs,
945 struct ceph_osd_request,
946 r_unsafe_item);
947 list_del_init(&req->r_unsafe_item);
948 if (ret >= 0)
949 ret = ceph_osdc_start_request(req->r_osdc,
950 req, false);
951 if (ret < 0) {
952 BUG_ON(ret == -EOLDSNAPC);
953 req->r_result = ret;
954 ceph_aio_complete_req(req, NULL);
955 }
956 }
957 return -EIOCBQUEUED;
958 }
959
960 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
961 ret = pos - iocb->ki_pos;
962 iocb->ki_pos = pos;
963 }
964 return ret;
965 }
966
967 /*
968 * Synchronous write, straight from __user pointer or user pages.
969 *
970 * If write spans object boundary, just do multiple writes. (For a
971 * correct atomic write, we should e.g. take write locks on all
972 * objects, rollback on failure, etc.)
973 */
974 static ssize_t
975 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
976 struct ceph_snap_context *snapc)
977 {
978 struct file *file = iocb->ki_filp;
979 struct inode *inode = file_inode(file);
980 struct ceph_inode_info *ci = ceph_inode(inode);
981 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
982 struct ceph_vino vino;
983 struct ceph_osd_request *req;
984 struct page **pages;
985 u64 len;
986 int num_pages;
987 int written = 0;
988 int flags;
989 int check_caps = 0;
990 int ret;
991 struct timespec mtime = CURRENT_TIME;
992 size_t count = iov_iter_count(from);
993
994 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
995 return -EROFS;
996
997 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
998
999 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1000 if (ret < 0)
1001 return ret;
1002
1003 ret = invalidate_inode_pages2_range(inode->i_mapping,
1004 pos >> PAGE_CACHE_SHIFT,
1005 (pos + count) >> PAGE_CACHE_SHIFT);
1006 if (ret < 0)
1007 dout("invalidate_inode_pages2_range returned %d\n", ret);
1008
1009 flags = CEPH_OSD_FLAG_ORDERSNAP |
1010 CEPH_OSD_FLAG_ONDISK |
1011 CEPH_OSD_FLAG_WRITE |
1012 CEPH_OSD_FLAG_ACK;
1013
1014 while ((len = iov_iter_count(from)) > 0) {
1015 size_t left;
1016 int n;
1017
1018 vino = ceph_vino(inode);
1019 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1020 vino, pos, &len, 0, 1,
1021 CEPH_OSD_OP_WRITE, flags, snapc,
1022 ci->i_truncate_seq,
1023 ci->i_truncate_size,
1024 false);
1025 if (IS_ERR(req)) {
1026 ret = PTR_ERR(req);
1027 break;
1028 }
1029
1030 /*
1031 * write from beginning of first page,
1032 * regardless of io alignment
1033 */
1034 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1035
1036 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1037 if (IS_ERR(pages)) {
1038 ret = PTR_ERR(pages);
1039 goto out;
1040 }
1041
1042 left = len;
1043 for (n = 0; n < num_pages; n++) {
1044 size_t plen = min_t(size_t, left, PAGE_SIZE);
1045 ret = copy_page_from_iter(pages[n], 0, plen, from);
1046 if (ret != plen) {
1047 ret = -EFAULT;
1048 break;
1049 }
1050 left -= ret;
1051 }
1052
1053 if (ret < 0) {
1054 ceph_release_page_vector(pages, num_pages);
1055 goto out;
1056 }
1057
1058 /* get a second commit callback */
1059 req->r_unsafe_callback = ceph_sync_write_unsafe;
1060 req->r_inode = inode;
1061
1062 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1063 false, true);
1064
1065 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
1066 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
1067
1068 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1069 if (!ret)
1070 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1071
1072 out:
1073 ceph_osdc_put_request(req);
1074 if (ret == 0) {
1075 pos += len;
1076 written += len;
1077
1078 if (pos > i_size_read(inode)) {
1079 check_caps = ceph_inode_set_size(inode, pos);
1080 if (check_caps)
1081 ceph_check_caps(ceph_inode(inode),
1082 CHECK_CAPS_AUTHONLY,
1083 NULL);
1084 }
1085 } else
1086 break;
1087 }
1088
1089 if (ret != -EOLDSNAPC && written > 0) {
1090 ret = written;
1091 iocb->ki_pos = pos;
1092 }
1093 return ret;
1094 }
1095
1096 /*
1097 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1098 * Atomically grab references, so that those bits are not released
1099 * back to the MDS mid-read.
1100 *
1101 * Hmm, the sync read case isn't actually async... should it be?
1102 */
1103 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1104 {
1105 struct file *filp = iocb->ki_filp;
1106 struct ceph_file_info *fi = filp->private_data;
1107 size_t len = iov_iter_count(to);
1108 struct inode *inode = file_inode(filp);
1109 struct ceph_inode_info *ci = ceph_inode(inode);
1110 struct page *pinned_page = NULL;
1111 ssize_t ret;
1112 int want, got = 0;
1113 int retry_op = 0, read = 0;
1114
1115 again:
1116 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1117 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1118
1119 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1120 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1121 else
1122 want = CEPH_CAP_FILE_CACHE;
1123 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1124 if (ret < 0)
1125 return ret;
1126
1127 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1128 (iocb->ki_flags & IOCB_DIRECT) ||
1129 (fi->flags & CEPH_F_SYNC)) {
1130
1131 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1132 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1133 ceph_cap_string(got));
1134
1135 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1136 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1137 ret = ceph_direct_read_write(iocb, to,
1138 NULL, NULL);
1139 if (ret >= 0 && ret < len)
1140 retry_op = CHECK_EOF;
1141 } else {
1142 ret = ceph_sync_read(iocb, to, &retry_op);
1143 }
1144 } else {
1145 retry_op = READ_INLINE;
1146 }
1147 } else {
1148 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1149 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1150 ceph_cap_string(got));
1151
1152 ret = generic_file_read_iter(iocb, to);
1153 }
1154 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1155 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1156 if (pinned_page) {
1157 page_cache_release(pinned_page);
1158 pinned_page = NULL;
1159 }
1160 ceph_put_cap_refs(ci, got);
1161 if (retry_op > HAVE_RETRIED && ret >= 0) {
1162 int statret;
1163 struct page *page = NULL;
1164 loff_t i_size;
1165 if (retry_op == READ_INLINE) {
1166 page = __page_cache_alloc(GFP_KERNEL);
1167 if (!page)
1168 return -ENOMEM;
1169 }
1170
1171 statret = __ceph_do_getattr(inode, page,
1172 CEPH_STAT_CAP_INLINE_DATA, !!page);
1173 if (statret < 0) {
1174 __free_page(page);
1175 if (statret == -ENODATA) {
1176 BUG_ON(retry_op != READ_INLINE);
1177 goto again;
1178 }
1179 return statret;
1180 }
1181
1182 i_size = i_size_read(inode);
1183 if (retry_op == READ_INLINE) {
1184 BUG_ON(ret > 0 || read > 0);
1185 if (iocb->ki_pos < i_size &&
1186 iocb->ki_pos < PAGE_CACHE_SIZE) {
1187 loff_t end = min_t(loff_t, i_size,
1188 iocb->ki_pos + len);
1189 end = min_t(loff_t, end, PAGE_CACHE_SIZE);
1190 if (statret < end)
1191 zero_user_segment(page, statret, end);
1192 ret = copy_page_to_iter(page,
1193 iocb->ki_pos & ~PAGE_MASK,
1194 end - iocb->ki_pos, to);
1195 iocb->ki_pos += ret;
1196 read += ret;
1197 }
1198 if (iocb->ki_pos < i_size && read < len) {
1199 size_t zlen = min_t(size_t, len - read,
1200 i_size - iocb->ki_pos);
1201 ret = iov_iter_zero(zlen, to);
1202 iocb->ki_pos += ret;
1203 read += ret;
1204 }
1205 __free_pages(page, 0);
1206 return read;
1207 }
1208
1209 /* hit EOF or hole? */
1210 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1211 ret < len) {
1212 dout("sync_read hit hole, ppos %lld < size %lld"
1213 ", reading more\n", iocb->ki_pos, i_size);
1214
1215 read += ret;
1216 len -= ret;
1217 retry_op = HAVE_RETRIED;
1218 goto again;
1219 }
1220 }
1221
1222 if (ret >= 0)
1223 ret += read;
1224
1225 return ret;
1226 }
1227
1228 /*
1229 * Take cap references to avoid releasing caps to MDS mid-write.
1230 *
1231 * If we are synchronous, and write with an old snap context, the OSD
1232 * may return EOLDSNAPC. In that case, retry the write.. _after_
1233 * dropping our cap refs and allowing the pending snap to logically
1234 * complete _before_ this write occurs.
1235 *
1236 * If we are near ENOSPC, write synchronously.
1237 */
1238 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1239 {
1240 struct file *file = iocb->ki_filp;
1241 struct ceph_file_info *fi = file->private_data;
1242 struct inode *inode = file_inode(file);
1243 struct ceph_inode_info *ci = ceph_inode(inode);
1244 struct ceph_osd_client *osdc =
1245 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1246 struct ceph_cap_flush *prealloc_cf;
1247 ssize_t count, written = 0;
1248 int err, want, got;
1249 loff_t pos;
1250
1251 if (ceph_snap(inode) != CEPH_NOSNAP)
1252 return -EROFS;
1253
1254 prealloc_cf = ceph_alloc_cap_flush();
1255 if (!prealloc_cf)
1256 return -ENOMEM;
1257
1258 inode_lock(inode);
1259
1260 /* We can write back this queue in page reclaim */
1261 current->backing_dev_info = inode_to_bdi(inode);
1262
1263 if (iocb->ki_flags & IOCB_APPEND) {
1264 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1265 if (err < 0)
1266 goto out;
1267 }
1268
1269 err = generic_write_checks(iocb, from);
1270 if (err <= 0)
1271 goto out;
1272
1273 pos = iocb->ki_pos;
1274 count = iov_iter_count(from);
1275 err = file_remove_privs(file);
1276 if (err)
1277 goto out;
1278
1279 err = file_update_time(file);
1280 if (err)
1281 goto out;
1282
1283 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1284 err = ceph_uninline_data(file, NULL);
1285 if (err < 0)
1286 goto out;
1287 }
1288
1289 retry_snap:
1290 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
1291 err = -ENOSPC;
1292 goto out;
1293 }
1294
1295 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1296 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1297 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1298 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1299 else
1300 want = CEPH_CAP_FILE_BUFFER;
1301 got = 0;
1302 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1303 &got, NULL);
1304 if (err < 0)
1305 goto out;
1306
1307 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1308 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1309
1310 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1311 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1312 struct ceph_snap_context *snapc;
1313 struct iov_iter data;
1314 inode_unlock(inode);
1315
1316 spin_lock(&ci->i_ceph_lock);
1317 if (__ceph_have_pending_cap_snap(ci)) {
1318 struct ceph_cap_snap *capsnap =
1319 list_last_entry(&ci->i_cap_snaps,
1320 struct ceph_cap_snap,
1321 ci_item);
1322 snapc = ceph_get_snap_context(capsnap->context);
1323 } else {
1324 BUG_ON(!ci->i_head_snapc);
1325 snapc = ceph_get_snap_context(ci->i_head_snapc);
1326 }
1327 spin_unlock(&ci->i_ceph_lock);
1328
1329 /* we might need to revert back to that point */
1330 data = *from;
1331 if (iocb->ki_flags & IOCB_DIRECT)
1332 written = ceph_direct_read_write(iocb, &data, snapc,
1333 &prealloc_cf);
1334 else
1335 written = ceph_sync_write(iocb, &data, pos, snapc);
1336 if (written == -EOLDSNAPC) {
1337 dout("aio_write %p %llx.%llx %llu~%u"
1338 "got EOLDSNAPC, retrying\n",
1339 inode, ceph_vinop(inode),
1340 pos, (unsigned)count);
1341 inode_lock(inode);
1342 goto retry_snap;
1343 }
1344 if (written > 0)
1345 iov_iter_advance(from, written);
1346 ceph_put_snap_context(snapc);
1347 } else {
1348 loff_t old_size = i_size_read(inode);
1349 /*
1350 * No need to acquire the i_truncate_mutex. Because
1351 * the MDS revokes Fwb caps before sending truncate
1352 * message to us. We can't get Fwb cap while there
1353 * are pending vmtruncate. So write and vmtruncate
1354 * can not run at the same time
1355 */
1356 written = generic_perform_write(file, from, pos);
1357 if (likely(written >= 0))
1358 iocb->ki_pos = pos + written;
1359 if (i_size_read(inode) > old_size)
1360 ceph_fscache_update_objectsize(inode);
1361 inode_unlock(inode);
1362 }
1363
1364 if (written >= 0) {
1365 int dirty;
1366 spin_lock(&ci->i_ceph_lock);
1367 ci->i_inline_version = CEPH_INLINE_NONE;
1368 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1369 &prealloc_cf);
1370 spin_unlock(&ci->i_ceph_lock);
1371 if (dirty)
1372 __mark_inode_dirty(inode, dirty);
1373 }
1374
1375 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1376 inode, ceph_vinop(inode), pos, (unsigned)count,
1377 ceph_cap_string(got));
1378 ceph_put_cap_refs(ci, got);
1379
1380 if (written >= 0 &&
1381 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1382 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1383 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1384 if (err < 0)
1385 written = err;
1386 }
1387
1388 goto out_unlocked;
1389
1390 out:
1391 inode_unlock(inode);
1392 out_unlocked:
1393 ceph_free_cap_flush(prealloc_cf);
1394 current->backing_dev_info = NULL;
1395 return written ? written : err;
1396 }
1397
1398 /*
1399 * llseek. be sure to verify file size on SEEK_END.
1400 */
1401 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1402 {
1403 struct inode *inode = file->f_mapping->host;
1404 loff_t i_size;
1405 int ret;
1406
1407 inode_lock(inode);
1408
1409 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1410 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1411 if (ret < 0) {
1412 offset = ret;
1413 goto out;
1414 }
1415 }
1416
1417 i_size = i_size_read(inode);
1418 switch (whence) {
1419 case SEEK_END:
1420 offset += i_size;
1421 break;
1422 case SEEK_CUR:
1423 /*
1424 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1425 * position-querying operation. Avoid rewriting the "same"
1426 * f_pos value back to the file because a concurrent read(),
1427 * write() or lseek() might have altered it
1428 */
1429 if (offset == 0) {
1430 offset = file->f_pos;
1431 goto out;
1432 }
1433 offset += file->f_pos;
1434 break;
1435 case SEEK_DATA:
1436 if (offset >= i_size) {
1437 ret = -ENXIO;
1438 goto out;
1439 }
1440 break;
1441 case SEEK_HOLE:
1442 if (offset >= i_size) {
1443 ret = -ENXIO;
1444 goto out;
1445 }
1446 offset = i_size;
1447 break;
1448 }
1449
1450 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1451
1452 out:
1453 inode_unlock(inode);
1454 return offset;
1455 }
1456
1457 static inline void ceph_zero_partial_page(
1458 struct inode *inode, loff_t offset, unsigned size)
1459 {
1460 struct page *page;
1461 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1462
1463 page = find_lock_page(inode->i_mapping, index);
1464 if (page) {
1465 wait_on_page_writeback(page);
1466 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1467 unlock_page(page);
1468 page_cache_release(page);
1469 }
1470 }
1471
1472 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1473 loff_t length)
1474 {
1475 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1476 if (offset < nearly) {
1477 loff_t size = nearly - offset;
1478 if (length < size)
1479 size = length;
1480 ceph_zero_partial_page(inode, offset, size);
1481 offset += size;
1482 length -= size;
1483 }
1484 if (length >= PAGE_CACHE_SIZE) {
1485 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1486 truncate_pagecache_range(inode, offset, offset + size - 1);
1487 offset += size;
1488 length -= size;
1489 }
1490 if (length)
1491 ceph_zero_partial_page(inode, offset, length);
1492 }
1493
1494 static int ceph_zero_partial_object(struct inode *inode,
1495 loff_t offset, loff_t *length)
1496 {
1497 struct ceph_inode_info *ci = ceph_inode(inode);
1498 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1499 struct ceph_osd_request *req;
1500 int ret = 0;
1501 loff_t zero = 0;
1502 int op;
1503
1504 if (!length) {
1505 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1506 length = &zero;
1507 } else {
1508 op = CEPH_OSD_OP_ZERO;
1509 }
1510
1511 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1512 ceph_vino(inode),
1513 offset, length,
1514 0, 1, op,
1515 CEPH_OSD_FLAG_WRITE |
1516 CEPH_OSD_FLAG_ONDISK,
1517 NULL, 0, 0, false);
1518 if (IS_ERR(req)) {
1519 ret = PTR_ERR(req);
1520 goto out;
1521 }
1522
1523 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1524 &inode->i_mtime);
1525
1526 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1527 if (!ret) {
1528 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1529 if (ret == -ENOENT)
1530 ret = 0;
1531 }
1532 ceph_osdc_put_request(req);
1533
1534 out:
1535 return ret;
1536 }
1537
1538 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1539 {
1540 int ret = 0;
1541 struct ceph_inode_info *ci = ceph_inode(inode);
1542 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1543 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1544 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1545 u64 object_set_size = object_size * stripe_count;
1546 u64 nearly, t;
1547
1548 /* round offset up to next period boundary */
1549 nearly = offset + object_set_size - 1;
1550 t = nearly;
1551 nearly -= do_div(t, object_set_size);
1552
1553 while (length && offset < nearly) {
1554 loff_t size = length;
1555 ret = ceph_zero_partial_object(inode, offset, &size);
1556 if (ret < 0)
1557 return ret;
1558 offset += size;
1559 length -= size;
1560 }
1561 while (length >= object_set_size) {
1562 int i;
1563 loff_t pos = offset;
1564 for (i = 0; i < stripe_count; ++i) {
1565 ret = ceph_zero_partial_object(inode, pos, NULL);
1566 if (ret < 0)
1567 return ret;
1568 pos += stripe_unit;
1569 }
1570 offset += object_set_size;
1571 length -= object_set_size;
1572 }
1573 while (length) {
1574 loff_t size = length;
1575 ret = ceph_zero_partial_object(inode, offset, &size);
1576 if (ret < 0)
1577 return ret;
1578 offset += size;
1579 length -= size;
1580 }
1581 return ret;
1582 }
1583
1584 static long ceph_fallocate(struct file *file, int mode,
1585 loff_t offset, loff_t length)
1586 {
1587 struct ceph_file_info *fi = file->private_data;
1588 struct inode *inode = file_inode(file);
1589 struct ceph_inode_info *ci = ceph_inode(inode);
1590 struct ceph_osd_client *osdc =
1591 &ceph_inode_to_client(inode)->client->osdc;
1592 struct ceph_cap_flush *prealloc_cf;
1593 int want, got = 0;
1594 int dirty;
1595 int ret = 0;
1596 loff_t endoff = 0;
1597 loff_t size;
1598
1599 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1600 return -EOPNOTSUPP;
1601
1602 if (!S_ISREG(inode->i_mode))
1603 return -EOPNOTSUPP;
1604
1605 prealloc_cf = ceph_alloc_cap_flush();
1606 if (!prealloc_cf)
1607 return -ENOMEM;
1608
1609 inode_lock(inode);
1610
1611 if (ceph_snap(inode) != CEPH_NOSNAP) {
1612 ret = -EROFS;
1613 goto unlock;
1614 }
1615
1616 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1617 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1618 ret = -ENOSPC;
1619 goto unlock;
1620 }
1621
1622 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1623 ret = ceph_uninline_data(file, NULL);
1624 if (ret < 0)
1625 goto unlock;
1626 }
1627
1628 size = i_size_read(inode);
1629 if (!(mode & FALLOC_FL_KEEP_SIZE))
1630 endoff = offset + length;
1631
1632 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1633 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1634 else
1635 want = CEPH_CAP_FILE_BUFFER;
1636
1637 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1638 if (ret < 0)
1639 goto unlock;
1640
1641 if (mode & FALLOC_FL_PUNCH_HOLE) {
1642 if (offset < size)
1643 ceph_zero_pagecache_range(inode, offset, length);
1644 ret = ceph_zero_objects(inode, offset, length);
1645 } else if (endoff > size) {
1646 truncate_pagecache_range(inode, size, -1);
1647 if (ceph_inode_set_size(inode, endoff))
1648 ceph_check_caps(ceph_inode(inode),
1649 CHECK_CAPS_AUTHONLY, NULL);
1650 }
1651
1652 if (!ret) {
1653 spin_lock(&ci->i_ceph_lock);
1654 ci->i_inline_version = CEPH_INLINE_NONE;
1655 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1656 &prealloc_cf);
1657 spin_unlock(&ci->i_ceph_lock);
1658 if (dirty)
1659 __mark_inode_dirty(inode, dirty);
1660 }
1661
1662 ceph_put_cap_refs(ci, got);
1663 unlock:
1664 inode_unlock(inode);
1665 ceph_free_cap_flush(prealloc_cf);
1666 return ret;
1667 }
1668
1669 const struct file_operations ceph_file_fops = {
1670 .open = ceph_open,
1671 .release = ceph_release,
1672 .llseek = ceph_llseek,
1673 .read_iter = ceph_read_iter,
1674 .write_iter = ceph_write_iter,
1675 .mmap = ceph_mmap,
1676 .fsync = ceph_fsync,
1677 .lock = ceph_lock,
1678 .flock = ceph_flock,
1679 .splice_read = generic_file_splice_read,
1680 .splice_write = iter_file_splice_write,
1681 .unlocked_ioctl = ceph_ioctl,
1682 .compat_ioctl = ceph_ioctl,
1683 .fallocate = ceph_fallocate,
1684 };
1685
Linux with added FPC-III support