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libceph: switch to calc_target(), part 2
[deliverable/linux.git] / fs / ceph / file.c
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_zalloc(ceph_file_cachep, GFP_KERNEL);
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 mask;
304 int err;
305
306 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
307 dir, dentry, dentry,
308 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
309
310 if (dentry->d_name.len > NAME_MAX)
311 return -ENAMETOOLONG;
312
313 err = ceph_init_dentry(dentry);
314 if (err < 0)
315 return err;
316
317 if (flags & O_CREAT) {
318 err = ceph_pre_init_acls(dir, &mode, &acls);
319 if (err < 0)
320 return err;
321 }
322
323 /* do the open */
324 req = prepare_open_request(dir->i_sb, flags, mode);
325 if (IS_ERR(req)) {
326 err = PTR_ERR(req);
327 goto out_acl;
328 }
329 req->r_dentry = dget(dentry);
330 req->r_num_caps = 2;
331 if (flags & O_CREAT) {
332 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
333 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
334 if (acls.pagelist) {
335 req->r_pagelist = acls.pagelist;
336 acls.pagelist = NULL;
337 }
338 }
339
340 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
341 if (ceph_security_xattr_wanted(dir))
342 mask |= CEPH_CAP_XATTR_SHARED;
343 req->r_args.open.mask = cpu_to_le32(mask);
344
345 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
346 err = ceph_mdsc_do_request(mdsc,
347 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
348 req);
349 err = ceph_handle_snapdir(req, dentry, err);
350 if (err)
351 goto out_req;
352
353 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
354 err = ceph_handle_notrace_create(dir, dentry);
355
356 if (d_unhashed(dentry)) {
357 dn = ceph_finish_lookup(req, dentry, err);
358 if (IS_ERR(dn))
359 err = PTR_ERR(dn);
360 } else {
361 /* we were given a hashed negative dentry */
362 dn = NULL;
363 }
364 if (err)
365 goto out_req;
366 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
367 /* make vfs retry on splice, ENOENT, or symlink */
368 dout("atomic_open finish_no_open on dn %p\n", dn);
369 err = finish_no_open(file, dn);
370 } else {
371 dout("atomic_open finish_open on dn %p\n", dn);
372 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
373 ceph_init_inode_acls(d_inode(dentry), &acls);
374 *opened |= FILE_CREATED;
375 }
376 err = finish_open(file, dentry, ceph_open, opened);
377 }
378 out_req:
379 if (!req->r_err && req->r_target_inode)
380 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
381 ceph_mdsc_put_request(req);
382 out_acl:
383 ceph_release_acls_info(&acls);
384 dout("atomic_open result=%d\n", err);
385 return err;
386 }
387
388 int ceph_release(struct inode *inode, struct file *file)
389 {
390 struct ceph_inode_info *ci = ceph_inode(inode);
391 struct ceph_file_info *cf = file->private_data;
392
393 dout("release inode %p file %p\n", inode, file);
394 ceph_put_fmode(ci, cf->fmode);
395 if (cf->last_readdir)
396 ceph_mdsc_put_request(cf->last_readdir);
397 kfree(cf->last_name);
398 kfree(cf->dir_info);
399 kmem_cache_free(ceph_file_cachep, cf);
400
401 /* wake up anyone waiting for caps on this inode */
402 wake_up_all(&ci->i_cap_wq);
403 return 0;
404 }
405
406 enum {
407 HAVE_RETRIED = 1,
408 CHECK_EOF = 2,
409 READ_INLINE = 3,
410 };
411
412 /*
413 * Read a range of bytes striped over one or more objects. Iterate over
414 * objects we stripe over. (That's not atomic, but good enough for now.)
415 *
416 * If we get a short result from the OSD, check against i_size; we need to
417 * only return a short read to the caller if we hit EOF.
418 */
419 static int striped_read(struct inode *inode,
420 u64 off, u64 len,
421 struct page **pages, int num_pages,
422 int *checkeof)
423 {
424 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
425 struct ceph_inode_info *ci = ceph_inode(inode);
426 u64 pos, this_len, left;
427 loff_t i_size;
428 int page_align, pages_left;
429 int read, ret;
430 struct page **page_pos;
431 bool hit_stripe, was_short;
432
433 /*
434 * we may need to do multiple reads. not atomic, unfortunately.
435 */
436 pos = off;
437 left = len;
438 page_pos = pages;
439 pages_left = num_pages;
440 read = 0;
441
442 more:
443 page_align = pos & ~PAGE_MASK;
444 this_len = left;
445 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
446 &ci->i_layout, pos, &this_len,
447 ci->i_truncate_seq,
448 ci->i_truncate_size,
449 page_pos, pages_left, page_align);
450 if (ret == -ENOENT)
451 ret = 0;
452 hit_stripe = this_len < left;
453 was_short = ret >= 0 && ret < this_len;
454 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
455 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
456
457 i_size = i_size_read(inode);
458 if (ret >= 0) {
459 int didpages;
460 if (was_short && (pos + ret < i_size)) {
461 int zlen = min(this_len - ret, i_size - pos - ret);
462 int zoff = (off & ~PAGE_MASK) + read + ret;
463 dout(" zero gap %llu to %llu\n",
464 pos + ret, pos + ret + zlen);
465 ceph_zero_page_vector_range(zoff, zlen, pages);
466 ret += zlen;
467 }
468
469 didpages = (page_align + ret) >> PAGE_SHIFT;
470 pos += ret;
471 read = pos - off;
472 left -= ret;
473 page_pos += didpages;
474 pages_left -= didpages;
475
476 /* hit stripe and need continue*/
477 if (left && hit_stripe && pos < i_size)
478 goto more;
479 }
480
481 if (read > 0) {
482 ret = read;
483 /* did we bounce off eof? */
484 if (pos + left > i_size)
485 *checkeof = CHECK_EOF;
486 }
487
488 dout("striped_read returns %d\n", ret);
489 return ret;
490 }
491
492 /*
493 * Completely synchronous read and write methods. Direct from __user
494 * buffer to osd, or directly to user pages (if O_DIRECT).
495 *
496 * If the read spans object boundary, just do multiple reads.
497 */
498 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
499 int *checkeof)
500 {
501 struct file *file = iocb->ki_filp;
502 struct inode *inode = file_inode(file);
503 struct page **pages;
504 u64 off = iocb->ki_pos;
505 int num_pages, ret;
506 size_t len = iov_iter_count(i);
507
508 dout("sync_read on file %p %llu~%u %s\n", file, off,
509 (unsigned)len,
510 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
511
512 if (!len)
513 return 0;
514 /*
515 * flush any page cache pages in this range. this
516 * will make concurrent normal and sync io slow,
517 * but it will at least behave sensibly when they are
518 * in sequence.
519 */
520 ret = filemap_write_and_wait_range(inode->i_mapping, off,
521 off + len);
522 if (ret < 0)
523 return ret;
524
525 num_pages = calc_pages_for(off, len);
526 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
527 if (IS_ERR(pages))
528 return PTR_ERR(pages);
529 ret = striped_read(inode, off, len, pages,
530 num_pages, checkeof);
531 if (ret > 0) {
532 int l, k = 0;
533 size_t left = ret;
534
535 while (left) {
536 size_t page_off = off & ~PAGE_MASK;
537 size_t copy = min_t(size_t, left,
538 PAGE_SIZE - page_off);
539 l = copy_page_to_iter(pages[k++], page_off, copy, i);
540 off += l;
541 left -= l;
542 if (l < copy)
543 break;
544 }
545 }
546 ceph_release_page_vector(pages, num_pages);
547
548 if (off > iocb->ki_pos) {
549 ret = off - iocb->ki_pos;
550 iocb->ki_pos = off;
551 }
552
553 dout("sync_read result %d\n", ret);
554 return ret;
555 }
556
557 struct ceph_aio_request {
558 struct kiocb *iocb;
559 size_t total_len;
560 int write;
561 int error;
562 struct list_head osd_reqs;
563 unsigned num_reqs;
564 atomic_t pending_reqs;
565 struct timespec mtime;
566 struct ceph_cap_flush *prealloc_cf;
567 };
568
569 struct ceph_aio_work {
570 struct work_struct work;
571 struct ceph_osd_request *req;
572 };
573
574 static void ceph_aio_retry_work(struct work_struct *work);
575
576 static void ceph_aio_complete(struct inode *inode,
577 struct ceph_aio_request *aio_req)
578 {
579 struct ceph_inode_info *ci = ceph_inode(inode);
580 int ret;
581
582 if (!atomic_dec_and_test(&aio_req->pending_reqs))
583 return;
584
585 ret = aio_req->error;
586 if (!ret)
587 ret = aio_req->total_len;
588
589 dout("ceph_aio_complete %p rc %d\n", inode, ret);
590
591 if (ret >= 0 && aio_req->write) {
592 int dirty;
593
594 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
595 if (endoff > i_size_read(inode)) {
596 if (ceph_inode_set_size(inode, endoff))
597 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
598 }
599
600 spin_lock(&ci->i_ceph_lock);
601 ci->i_inline_version = CEPH_INLINE_NONE;
602 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
603 &aio_req->prealloc_cf);
604 spin_unlock(&ci->i_ceph_lock);
605 if (dirty)
606 __mark_inode_dirty(inode, dirty);
607
608 }
609
610 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
611 CEPH_CAP_FILE_RD));
612
613 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
614
615 ceph_free_cap_flush(aio_req->prealloc_cf);
616 kfree(aio_req);
617 }
618
619 static void ceph_aio_complete_req(struct ceph_osd_request *req,
620 struct ceph_msg *msg)
621 {
622 int rc = req->r_result;
623 struct inode *inode = req->r_inode;
624 struct ceph_aio_request *aio_req = req->r_priv;
625 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
626 int num_pages = calc_pages_for((u64)osd_data->alignment,
627 osd_data->length);
628
629 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
630 inode, rc, osd_data->length);
631
632 if (rc == -EOLDSNAPC) {
633 struct ceph_aio_work *aio_work;
634 BUG_ON(!aio_req->write);
635
636 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
637 if (aio_work) {
638 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
639 aio_work->req = req;
640 queue_work(ceph_inode_to_client(inode)->wb_wq,
641 &aio_work->work);
642 return;
643 }
644 rc = -ENOMEM;
645 } else if (!aio_req->write) {
646 if (rc == -ENOENT)
647 rc = 0;
648 if (rc >= 0 && osd_data->length > rc) {
649 int zoff = osd_data->alignment + rc;
650 int zlen = osd_data->length - rc;
651 /*
652 * If read is satisfied by single OSD request,
653 * it can pass EOF. Otherwise read is within
654 * i_size.
655 */
656 if (aio_req->num_reqs == 1) {
657 loff_t i_size = i_size_read(inode);
658 loff_t endoff = aio_req->iocb->ki_pos + rc;
659 if (endoff < i_size)
660 zlen = min_t(size_t, zlen,
661 i_size - endoff);
662 aio_req->total_len = rc + zlen;
663 }
664
665 if (zlen > 0)
666 ceph_zero_page_vector_range(zoff, zlen,
667 osd_data->pages);
668 }
669 }
670
671 ceph_put_page_vector(osd_data->pages, num_pages, false);
672 ceph_osdc_put_request(req);
673
674 if (rc < 0)
675 cmpxchg(&aio_req->error, 0, rc);
676
677 ceph_aio_complete(inode, aio_req);
678 return;
679 }
680
681 static void ceph_aio_retry_work(struct work_struct *work)
682 {
683 struct ceph_aio_work *aio_work =
684 container_of(work, struct ceph_aio_work, work);
685 struct ceph_osd_request *orig_req = aio_work->req;
686 struct ceph_aio_request *aio_req = orig_req->r_priv;
687 struct inode *inode = orig_req->r_inode;
688 struct ceph_inode_info *ci = ceph_inode(inode);
689 struct ceph_snap_context *snapc;
690 struct ceph_osd_request *req;
691 int ret;
692
693 spin_lock(&ci->i_ceph_lock);
694 if (__ceph_have_pending_cap_snap(ci)) {
695 struct ceph_cap_snap *capsnap =
696 list_last_entry(&ci->i_cap_snaps,
697 struct ceph_cap_snap,
698 ci_item);
699 snapc = ceph_get_snap_context(capsnap->context);
700 } else {
701 BUG_ON(!ci->i_head_snapc);
702 snapc = ceph_get_snap_context(ci->i_head_snapc);
703 }
704 spin_unlock(&ci->i_ceph_lock);
705
706 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
707 false, GFP_NOFS);
708 if (!req) {
709 ret = -ENOMEM;
710 req = orig_req;
711 goto out;
712 }
713
714 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
715 CEPH_OSD_FLAG_ONDISK |
716 CEPH_OSD_FLAG_WRITE;
717 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
718 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
719
720 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
721 if (ret) {
722 ceph_osdc_put_request(req);
723 req = orig_req;
724 goto out;
725 }
726
727 req->r_ops[0] = orig_req->r_ops[0];
728 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
729
730 req->r_mtime = aio_req->mtime;
731 req->r_data_offset = req->r_ops[0].extent.offset;
732
733 ceph_osdc_put_request(orig_req);
734
735 req->r_callback = ceph_aio_complete_req;
736 req->r_inode = inode;
737 req->r_priv = aio_req;
738
739 ret = ceph_osdc_start_request(req->r_osdc, req, false);
740 out:
741 if (ret < 0) {
742 req->r_result = ret;
743 ceph_aio_complete_req(req, NULL);
744 }
745
746 ceph_put_snap_context(snapc);
747 kfree(aio_work);
748 }
749
750 /*
751 * Write commit request unsafe callback, called to tell us when a
752 * request is unsafe (that is, in flight--has been handed to the
753 * messenger to send to its target osd). It is called again when
754 * we've received a response message indicating the request is
755 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
756 * is completed early (and unsuccessfully) due to a timeout or
757 * interrupt.
758 *
759 * This is used if we requested both an ACK and ONDISK commit reply
760 * from the OSD.
761 */
762 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
763 {
764 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
765
766 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
767 unsafe ? "un" : "");
768 if (unsafe) {
769 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
770 spin_lock(&ci->i_unsafe_lock);
771 list_add_tail(&req->r_unsafe_item,
772 &ci->i_unsafe_writes);
773 spin_unlock(&ci->i_unsafe_lock);
774 } else {
775 spin_lock(&ci->i_unsafe_lock);
776 list_del_init(&req->r_unsafe_item);
777 spin_unlock(&ci->i_unsafe_lock);
778 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
779 }
780 }
781
782
783 static ssize_t
784 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
785 struct ceph_snap_context *snapc,
786 struct ceph_cap_flush **pcf)
787 {
788 struct file *file = iocb->ki_filp;
789 struct inode *inode = file_inode(file);
790 struct ceph_inode_info *ci = ceph_inode(inode);
791 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
792 struct ceph_vino vino;
793 struct ceph_osd_request *req;
794 struct page **pages;
795 struct ceph_aio_request *aio_req = NULL;
796 int num_pages = 0;
797 int flags;
798 int ret;
799 struct timespec mtime = current_fs_time(inode->i_sb);
800 size_t count = iov_iter_count(iter);
801 loff_t pos = iocb->ki_pos;
802 bool write = iov_iter_rw(iter) == WRITE;
803
804 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
805 return -EROFS;
806
807 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
808 (write ? "write" : "read"), file, pos, (unsigned)count);
809
810 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
811 if (ret < 0)
812 return ret;
813
814 if (write) {
815 ret = invalidate_inode_pages2_range(inode->i_mapping,
816 pos >> PAGE_SHIFT,
817 (pos + count) >> PAGE_SHIFT);
818 if (ret < 0)
819 dout("invalidate_inode_pages2_range returned %d\n", ret);
820
821 flags = CEPH_OSD_FLAG_ORDERSNAP |
822 CEPH_OSD_FLAG_ONDISK |
823 CEPH_OSD_FLAG_WRITE;
824 } else {
825 flags = CEPH_OSD_FLAG_READ;
826 }
827
828 while (iov_iter_count(iter) > 0) {
829 u64 size = dio_get_pagev_size(iter);
830 size_t start = 0;
831 ssize_t len;
832
833 vino = ceph_vino(inode);
834 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
835 vino, pos, &size, 0,
836 /*include a 'startsync' command*/
837 write ? 2 : 1,
838 write ? CEPH_OSD_OP_WRITE :
839 CEPH_OSD_OP_READ,
840 flags, snapc,
841 ci->i_truncate_seq,
842 ci->i_truncate_size,
843 false);
844 if (IS_ERR(req)) {
845 ret = PTR_ERR(req);
846 break;
847 }
848
849 len = size;
850 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
851 if (IS_ERR(pages)) {
852 ceph_osdc_put_request(req);
853 ret = PTR_ERR(pages);
854 break;
855 }
856
857 /*
858 * To simplify error handling, allow AIO when IO within i_size
859 * or IO can be satisfied by single OSD request.
860 */
861 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
862 (len == count || pos + count <= i_size_read(inode))) {
863 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
864 if (aio_req) {
865 aio_req->iocb = iocb;
866 aio_req->write = write;
867 INIT_LIST_HEAD(&aio_req->osd_reqs);
868 if (write) {
869 aio_req->mtime = mtime;
870 swap(aio_req->prealloc_cf, *pcf);
871 }
872 }
873 /* ignore error */
874 }
875
876 if (write) {
877 /*
878 * throw out any page cache pages in this range. this
879 * may block.
880 */
881 truncate_inode_pages_range(inode->i_mapping, pos,
882 (pos+len) | (PAGE_SIZE - 1));
883
884 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
885 req->r_mtime = mtime;
886 }
887
888 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
889 false, false);
890
891 if (aio_req) {
892 aio_req->total_len += len;
893 aio_req->num_reqs++;
894 atomic_inc(&aio_req->pending_reqs);
895
896 req->r_callback = ceph_aio_complete_req;
897 req->r_inode = inode;
898 req->r_priv = aio_req;
899 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
900
901 pos += len;
902 iov_iter_advance(iter, len);
903 continue;
904 }
905
906 ret = ceph_osdc_start_request(req->r_osdc, req, false);
907 if (!ret)
908 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
909
910 size = i_size_read(inode);
911 if (!write) {
912 if (ret == -ENOENT)
913 ret = 0;
914 if (ret >= 0 && ret < len && pos + ret < size) {
915 int zlen = min_t(size_t, len - ret,
916 size - pos - ret);
917 ceph_zero_page_vector_range(start + ret, zlen,
918 pages);
919 ret += zlen;
920 }
921 if (ret >= 0)
922 len = ret;
923 }
924
925 ceph_put_page_vector(pages, num_pages, false);
926
927 ceph_osdc_put_request(req);
928 if (ret < 0)
929 break;
930
931 pos += len;
932 iov_iter_advance(iter, len);
933
934 if (!write && pos >= size)
935 break;
936
937 if (write && pos > size) {
938 if (ceph_inode_set_size(inode, pos))
939 ceph_check_caps(ceph_inode(inode),
940 CHECK_CAPS_AUTHONLY,
941 NULL);
942 }
943 }
944
945 if (aio_req) {
946 if (aio_req->num_reqs == 0) {
947 kfree(aio_req);
948 return ret;
949 }
950
951 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
952 CEPH_CAP_FILE_RD);
953
954 while (!list_empty(&aio_req->osd_reqs)) {
955 req = list_first_entry(&aio_req->osd_reqs,
956 struct ceph_osd_request,
957 r_unsafe_item);
958 list_del_init(&req->r_unsafe_item);
959 if (ret >= 0)
960 ret = ceph_osdc_start_request(req->r_osdc,
961 req, false);
962 if (ret < 0) {
963 req->r_result = ret;
964 ceph_aio_complete_req(req, NULL);
965 }
966 }
967 return -EIOCBQUEUED;
968 }
969
970 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
971 ret = pos - iocb->ki_pos;
972 iocb->ki_pos = pos;
973 }
974 return ret;
975 }
976
977 /*
978 * Synchronous write, straight from __user pointer or user pages.
979 *
980 * If write spans object boundary, just do multiple writes. (For a
981 * correct atomic write, we should e.g. take write locks on all
982 * objects, rollback on failure, etc.)
983 */
984 static ssize_t
985 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
986 struct ceph_snap_context *snapc)
987 {
988 struct file *file = iocb->ki_filp;
989 struct inode *inode = file_inode(file);
990 struct ceph_inode_info *ci = ceph_inode(inode);
991 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
992 struct ceph_vino vino;
993 struct ceph_osd_request *req;
994 struct page **pages;
995 u64 len;
996 int num_pages;
997 int written = 0;
998 int flags;
999 int check_caps = 0;
1000 int ret;
1001 struct timespec mtime = current_fs_time(inode->i_sb);
1002 size_t count = iov_iter_count(from);
1003
1004 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1005 return -EROFS;
1006
1007 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1008
1009 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1010 if (ret < 0)
1011 return ret;
1012
1013 ret = invalidate_inode_pages2_range(inode->i_mapping,
1014 pos >> PAGE_SHIFT,
1015 (pos + count) >> PAGE_SHIFT);
1016 if (ret < 0)
1017 dout("invalidate_inode_pages2_range returned %d\n", ret);
1018
1019 flags = CEPH_OSD_FLAG_ORDERSNAP |
1020 CEPH_OSD_FLAG_ONDISK |
1021 CEPH_OSD_FLAG_WRITE |
1022 CEPH_OSD_FLAG_ACK;
1023
1024 while ((len = iov_iter_count(from)) > 0) {
1025 size_t left;
1026 int n;
1027
1028 vino = ceph_vino(inode);
1029 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1030 vino, pos, &len, 0, 1,
1031 CEPH_OSD_OP_WRITE, flags, snapc,
1032 ci->i_truncate_seq,
1033 ci->i_truncate_size,
1034 false);
1035 if (IS_ERR(req)) {
1036 ret = PTR_ERR(req);
1037 break;
1038 }
1039
1040 /*
1041 * write from beginning of first page,
1042 * regardless of io alignment
1043 */
1044 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1045
1046 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1047 if (IS_ERR(pages)) {
1048 ret = PTR_ERR(pages);
1049 goto out;
1050 }
1051
1052 left = len;
1053 for (n = 0; n < num_pages; n++) {
1054 size_t plen = min_t(size_t, left, PAGE_SIZE);
1055 ret = copy_page_from_iter(pages[n], 0, plen, from);
1056 if (ret != plen) {
1057 ret = -EFAULT;
1058 break;
1059 }
1060 left -= ret;
1061 }
1062
1063 if (ret < 0) {
1064 ceph_release_page_vector(pages, num_pages);
1065 goto out;
1066 }
1067
1068 /* get a second commit callback */
1069 req->r_unsafe_callback = ceph_sync_write_unsafe;
1070 req->r_inode = inode;
1071
1072 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1073 false, true);
1074
1075 req->r_mtime = mtime;
1076 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1077 if (!ret)
1078 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1079
1080 out:
1081 ceph_osdc_put_request(req);
1082 if (ret == 0) {
1083 pos += len;
1084 written += len;
1085
1086 if (pos > i_size_read(inode)) {
1087 check_caps = ceph_inode_set_size(inode, pos);
1088 if (check_caps)
1089 ceph_check_caps(ceph_inode(inode),
1090 CHECK_CAPS_AUTHONLY,
1091 NULL);
1092 }
1093 } else
1094 break;
1095 }
1096
1097 if (ret != -EOLDSNAPC && written > 0) {
1098 ret = written;
1099 iocb->ki_pos = pos;
1100 }
1101 return ret;
1102 }
1103
1104 /*
1105 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1106 * Atomically grab references, so that those bits are not released
1107 * back to the MDS mid-read.
1108 *
1109 * Hmm, the sync read case isn't actually async... should it be?
1110 */
1111 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1112 {
1113 struct file *filp = iocb->ki_filp;
1114 struct ceph_file_info *fi = filp->private_data;
1115 size_t len = iov_iter_count(to);
1116 struct inode *inode = file_inode(filp);
1117 struct ceph_inode_info *ci = ceph_inode(inode);
1118 struct page *pinned_page = NULL;
1119 ssize_t ret;
1120 int want, got = 0;
1121 int retry_op = 0, read = 0;
1122
1123 again:
1124 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1125 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1126
1127 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1128 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1129 else
1130 want = CEPH_CAP_FILE_CACHE;
1131 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1132 if (ret < 0)
1133 return ret;
1134
1135 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1136 (iocb->ki_flags & IOCB_DIRECT) ||
1137 (fi->flags & CEPH_F_SYNC)) {
1138
1139 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1140 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1141 ceph_cap_string(got));
1142
1143 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1144 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1145 ret = ceph_direct_read_write(iocb, to,
1146 NULL, NULL);
1147 if (ret >= 0 && ret < len)
1148 retry_op = CHECK_EOF;
1149 } else {
1150 ret = ceph_sync_read(iocb, to, &retry_op);
1151 }
1152 } else {
1153 retry_op = READ_INLINE;
1154 }
1155 } else {
1156 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1157 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1158 ceph_cap_string(got));
1159
1160 ret = generic_file_read_iter(iocb, to);
1161 }
1162 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1163 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1164 if (pinned_page) {
1165 put_page(pinned_page);
1166 pinned_page = NULL;
1167 }
1168 ceph_put_cap_refs(ci, got);
1169 if (retry_op > HAVE_RETRIED && ret >= 0) {
1170 int statret;
1171 struct page *page = NULL;
1172 loff_t i_size;
1173 if (retry_op == READ_INLINE) {
1174 page = __page_cache_alloc(GFP_KERNEL);
1175 if (!page)
1176 return -ENOMEM;
1177 }
1178
1179 statret = __ceph_do_getattr(inode, page,
1180 CEPH_STAT_CAP_INLINE_DATA, !!page);
1181 if (statret < 0) {
1182 __free_page(page);
1183 if (statret == -ENODATA) {
1184 BUG_ON(retry_op != READ_INLINE);
1185 goto again;
1186 }
1187 return statret;
1188 }
1189
1190 i_size = i_size_read(inode);
1191 if (retry_op == READ_INLINE) {
1192 BUG_ON(ret > 0 || read > 0);
1193 if (iocb->ki_pos < i_size &&
1194 iocb->ki_pos < PAGE_SIZE) {
1195 loff_t end = min_t(loff_t, i_size,
1196 iocb->ki_pos + len);
1197 end = min_t(loff_t, end, PAGE_SIZE);
1198 if (statret < end)
1199 zero_user_segment(page, statret, end);
1200 ret = copy_page_to_iter(page,
1201 iocb->ki_pos & ~PAGE_MASK,
1202 end - iocb->ki_pos, to);
1203 iocb->ki_pos += ret;
1204 read += ret;
1205 }
1206 if (iocb->ki_pos < i_size && read < len) {
1207 size_t zlen = min_t(size_t, len - read,
1208 i_size - iocb->ki_pos);
1209 ret = iov_iter_zero(zlen, to);
1210 iocb->ki_pos += ret;
1211 read += ret;
1212 }
1213 __free_pages(page, 0);
1214 return read;
1215 }
1216
1217 /* hit EOF or hole? */
1218 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1219 ret < len) {
1220 dout("sync_read hit hole, ppos %lld < size %lld"
1221 ", reading more\n", iocb->ki_pos, i_size);
1222
1223 read += ret;
1224 len -= ret;
1225 retry_op = HAVE_RETRIED;
1226 goto again;
1227 }
1228 }
1229
1230 if (ret >= 0)
1231 ret += read;
1232
1233 return ret;
1234 }
1235
1236 /*
1237 * Take cap references to avoid releasing caps to MDS mid-write.
1238 *
1239 * If we are synchronous, and write with an old snap context, the OSD
1240 * may return EOLDSNAPC. In that case, retry the write.. _after_
1241 * dropping our cap refs and allowing the pending snap to logically
1242 * complete _before_ this write occurs.
1243 *
1244 * If we are near ENOSPC, write synchronously.
1245 */
1246 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1247 {
1248 struct file *file = iocb->ki_filp;
1249 struct ceph_file_info *fi = file->private_data;
1250 struct inode *inode = file_inode(file);
1251 struct ceph_inode_info *ci = ceph_inode(inode);
1252 struct ceph_osd_client *osdc =
1253 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1254 struct ceph_cap_flush *prealloc_cf;
1255 ssize_t count, written = 0;
1256 int err, want, got;
1257 loff_t pos;
1258
1259 if (ceph_snap(inode) != CEPH_NOSNAP)
1260 return -EROFS;
1261
1262 prealloc_cf = ceph_alloc_cap_flush();
1263 if (!prealloc_cf)
1264 return -ENOMEM;
1265
1266 inode_lock(inode);
1267
1268 /* We can write back this queue in page reclaim */
1269 current->backing_dev_info = inode_to_bdi(inode);
1270
1271 if (iocb->ki_flags & IOCB_APPEND) {
1272 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1273 if (err < 0)
1274 goto out;
1275 }
1276
1277 err = generic_write_checks(iocb, from);
1278 if (err <= 0)
1279 goto out;
1280
1281 pos = iocb->ki_pos;
1282 count = iov_iter_count(from);
1283 err = file_remove_privs(file);
1284 if (err)
1285 goto out;
1286
1287 err = file_update_time(file);
1288 if (err)
1289 goto out;
1290
1291 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1292 err = ceph_uninline_data(file, NULL);
1293 if (err < 0)
1294 goto out;
1295 }
1296
1297 retry_snap:
1298 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
1299 err = -ENOSPC;
1300 goto out;
1301 }
1302
1303 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1304 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1305 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1306 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1307 else
1308 want = CEPH_CAP_FILE_BUFFER;
1309 got = 0;
1310 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1311 &got, NULL);
1312 if (err < 0)
1313 goto out;
1314
1315 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1316 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1317
1318 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1319 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1320 struct ceph_snap_context *snapc;
1321 struct iov_iter data;
1322 inode_unlock(inode);
1323
1324 spin_lock(&ci->i_ceph_lock);
1325 if (__ceph_have_pending_cap_snap(ci)) {
1326 struct ceph_cap_snap *capsnap =
1327 list_last_entry(&ci->i_cap_snaps,
1328 struct ceph_cap_snap,
1329 ci_item);
1330 snapc = ceph_get_snap_context(capsnap->context);
1331 } else {
1332 BUG_ON(!ci->i_head_snapc);
1333 snapc = ceph_get_snap_context(ci->i_head_snapc);
1334 }
1335 spin_unlock(&ci->i_ceph_lock);
1336
1337 /* we might need to revert back to that point */
1338 data = *from;
1339 if (iocb->ki_flags & IOCB_DIRECT)
1340 written = ceph_direct_read_write(iocb, &data, snapc,
1341 &prealloc_cf);
1342 else
1343 written = ceph_sync_write(iocb, &data, pos, snapc);
1344 if (written == -EOLDSNAPC) {
1345 dout("aio_write %p %llx.%llx %llu~%u"
1346 "got EOLDSNAPC, retrying\n",
1347 inode, ceph_vinop(inode),
1348 pos, (unsigned)count);
1349 inode_lock(inode);
1350 goto retry_snap;
1351 }
1352 if (written > 0)
1353 iov_iter_advance(from, written);
1354 ceph_put_snap_context(snapc);
1355 } else {
1356 loff_t old_size = i_size_read(inode);
1357 /*
1358 * No need to acquire the i_truncate_mutex. Because
1359 * the MDS revokes Fwb caps before sending truncate
1360 * message to us. We can't get Fwb cap while there
1361 * are pending vmtruncate. So write and vmtruncate
1362 * can not run at the same time
1363 */
1364 written = generic_perform_write(file, from, pos);
1365 if (likely(written >= 0))
1366 iocb->ki_pos = pos + written;
1367 if (i_size_read(inode) > old_size)
1368 ceph_fscache_update_objectsize(inode);
1369 inode_unlock(inode);
1370 }
1371
1372 if (written >= 0) {
1373 int dirty;
1374 spin_lock(&ci->i_ceph_lock);
1375 ci->i_inline_version = CEPH_INLINE_NONE;
1376 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1377 &prealloc_cf);
1378 spin_unlock(&ci->i_ceph_lock);
1379 if (dirty)
1380 __mark_inode_dirty(inode, dirty);
1381 }
1382
1383 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1384 inode, ceph_vinop(inode), pos, (unsigned)count,
1385 ceph_cap_string(got));
1386 ceph_put_cap_refs(ci, got);
1387
1388 if (written >= 0 &&
1389 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1390 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1391 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1392 if (err < 0)
1393 written = err;
1394 }
1395
1396 goto out_unlocked;
1397
1398 out:
1399 inode_unlock(inode);
1400 out_unlocked:
1401 ceph_free_cap_flush(prealloc_cf);
1402 current->backing_dev_info = NULL;
1403 return written ? written : err;
1404 }
1405
1406 /*
1407 * llseek. be sure to verify file size on SEEK_END.
1408 */
1409 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1410 {
1411 struct inode *inode = file->f_mapping->host;
1412 loff_t i_size;
1413 int ret;
1414
1415 inode_lock(inode);
1416
1417 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1418 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1419 if (ret < 0) {
1420 offset = ret;
1421 goto out;
1422 }
1423 }
1424
1425 i_size = i_size_read(inode);
1426 switch (whence) {
1427 case SEEK_END:
1428 offset += i_size;
1429 break;
1430 case SEEK_CUR:
1431 /*
1432 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1433 * position-querying operation. Avoid rewriting the "same"
1434 * f_pos value back to the file because a concurrent read(),
1435 * write() or lseek() might have altered it
1436 */
1437 if (offset == 0) {
1438 offset = file->f_pos;
1439 goto out;
1440 }
1441 offset += file->f_pos;
1442 break;
1443 case SEEK_DATA:
1444 if (offset >= i_size) {
1445 ret = -ENXIO;
1446 goto out;
1447 }
1448 break;
1449 case SEEK_HOLE:
1450 if (offset >= i_size) {
1451 ret = -ENXIO;
1452 goto out;
1453 }
1454 offset = i_size;
1455 break;
1456 }
1457
1458 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1459
1460 out:
1461 inode_unlock(inode);
1462 return offset;
1463 }
1464
1465 static inline void ceph_zero_partial_page(
1466 struct inode *inode, loff_t offset, unsigned size)
1467 {
1468 struct page *page;
1469 pgoff_t index = offset >> PAGE_SHIFT;
1470
1471 page = find_lock_page(inode->i_mapping, index);
1472 if (page) {
1473 wait_on_page_writeback(page);
1474 zero_user(page, offset & (PAGE_SIZE - 1), size);
1475 unlock_page(page);
1476 put_page(page);
1477 }
1478 }
1479
1480 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1481 loff_t length)
1482 {
1483 loff_t nearly = round_up(offset, PAGE_SIZE);
1484 if (offset < nearly) {
1485 loff_t size = nearly - offset;
1486 if (length < size)
1487 size = length;
1488 ceph_zero_partial_page(inode, offset, size);
1489 offset += size;
1490 length -= size;
1491 }
1492 if (length >= PAGE_SIZE) {
1493 loff_t size = round_down(length, PAGE_SIZE);
1494 truncate_pagecache_range(inode, offset, offset + size - 1);
1495 offset += size;
1496 length -= size;
1497 }
1498 if (length)
1499 ceph_zero_partial_page(inode, offset, length);
1500 }
1501
1502 static int ceph_zero_partial_object(struct inode *inode,
1503 loff_t offset, loff_t *length)
1504 {
1505 struct ceph_inode_info *ci = ceph_inode(inode);
1506 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1507 struct ceph_osd_request *req;
1508 int ret = 0;
1509 loff_t zero = 0;
1510 int op;
1511
1512 if (!length) {
1513 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1514 length = &zero;
1515 } else {
1516 op = CEPH_OSD_OP_ZERO;
1517 }
1518
1519 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1520 ceph_vino(inode),
1521 offset, length,
1522 0, 1, op,
1523 CEPH_OSD_FLAG_WRITE |
1524 CEPH_OSD_FLAG_ONDISK,
1525 NULL, 0, 0, false);
1526 if (IS_ERR(req)) {
1527 ret = PTR_ERR(req);
1528 goto out;
1529 }
1530
1531 req->r_mtime = inode->i_mtime;
1532 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1533 if (!ret) {
1534 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1535 if (ret == -ENOENT)
1536 ret = 0;
1537 }
1538 ceph_osdc_put_request(req);
1539
1540 out:
1541 return ret;
1542 }
1543
1544 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1545 {
1546 int ret = 0;
1547 struct ceph_inode_info *ci = ceph_inode(inode);
1548 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1549 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1550 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1551 u64 object_set_size = object_size * stripe_count;
1552 u64 nearly, t;
1553
1554 /* round offset up to next period boundary */
1555 nearly = offset + object_set_size - 1;
1556 t = nearly;
1557 nearly -= do_div(t, object_set_size);
1558
1559 while (length && offset < nearly) {
1560 loff_t size = length;
1561 ret = ceph_zero_partial_object(inode, offset, &size);
1562 if (ret < 0)
1563 return ret;
1564 offset += size;
1565 length -= size;
1566 }
1567 while (length >= object_set_size) {
1568 int i;
1569 loff_t pos = offset;
1570 for (i = 0; i < stripe_count; ++i) {
1571 ret = ceph_zero_partial_object(inode, pos, NULL);
1572 if (ret < 0)
1573 return ret;
1574 pos += stripe_unit;
1575 }
1576 offset += object_set_size;
1577 length -= object_set_size;
1578 }
1579 while (length) {
1580 loff_t size = length;
1581 ret = ceph_zero_partial_object(inode, offset, &size);
1582 if (ret < 0)
1583 return ret;
1584 offset += size;
1585 length -= size;
1586 }
1587 return ret;
1588 }
1589
1590 static long ceph_fallocate(struct file *file, int mode,
1591 loff_t offset, loff_t length)
1592 {
1593 struct ceph_file_info *fi = file->private_data;
1594 struct inode *inode = file_inode(file);
1595 struct ceph_inode_info *ci = ceph_inode(inode);
1596 struct ceph_osd_client *osdc =
1597 &ceph_inode_to_client(inode)->client->osdc;
1598 struct ceph_cap_flush *prealloc_cf;
1599 int want, got = 0;
1600 int dirty;
1601 int ret = 0;
1602 loff_t endoff = 0;
1603 loff_t size;
1604
1605 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1606 return -EOPNOTSUPP;
1607
1608 if (!S_ISREG(inode->i_mode))
1609 return -EOPNOTSUPP;
1610
1611 prealloc_cf = ceph_alloc_cap_flush();
1612 if (!prealloc_cf)
1613 return -ENOMEM;
1614
1615 inode_lock(inode);
1616
1617 if (ceph_snap(inode) != CEPH_NOSNAP) {
1618 ret = -EROFS;
1619 goto unlock;
1620 }
1621
1622 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1623 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1624 ret = -ENOSPC;
1625 goto unlock;
1626 }
1627
1628 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1629 ret = ceph_uninline_data(file, NULL);
1630 if (ret < 0)
1631 goto unlock;
1632 }
1633
1634 size = i_size_read(inode);
1635 if (!(mode & FALLOC_FL_KEEP_SIZE))
1636 endoff = offset + length;
1637
1638 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1639 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1640 else
1641 want = CEPH_CAP_FILE_BUFFER;
1642
1643 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1644 if (ret < 0)
1645 goto unlock;
1646
1647 if (mode & FALLOC_FL_PUNCH_HOLE) {
1648 if (offset < size)
1649 ceph_zero_pagecache_range(inode, offset, length);
1650 ret = ceph_zero_objects(inode, offset, length);
1651 } else if (endoff > size) {
1652 truncate_pagecache_range(inode, size, -1);
1653 if (ceph_inode_set_size(inode, endoff))
1654 ceph_check_caps(ceph_inode(inode),
1655 CHECK_CAPS_AUTHONLY, NULL);
1656 }
1657
1658 if (!ret) {
1659 spin_lock(&ci->i_ceph_lock);
1660 ci->i_inline_version = CEPH_INLINE_NONE;
1661 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1662 &prealloc_cf);
1663 spin_unlock(&ci->i_ceph_lock);
1664 if (dirty)
1665 __mark_inode_dirty(inode, dirty);
1666 }
1667
1668 ceph_put_cap_refs(ci, got);
1669 unlock:
1670 inode_unlock(inode);
1671 ceph_free_cap_flush(prealloc_cf);
1672 return ret;
1673 }
1674
1675 const struct file_operations ceph_file_fops = {
1676 .open = ceph_open,
1677 .release = ceph_release,
1678 .llseek = ceph_llseek,
1679 .read_iter = ceph_read_iter,
1680 .write_iter = ceph_write_iter,
1681 .mmap = ceph_mmap,
1682 .fsync = ceph_fsync,
1683 .lock = ceph_lock,
1684 .flock = ceph_flock,
1685 .splice_read = generic_file_splice_read,
1686 .splice_write = iter_file_splice_write,
1687 .unlocked_ioctl = ceph_ioctl,
1688 .compat_ioctl = ceph_ioctl,
1689 .fallocate = ceph_fallocate,
1690 };
1691
Linux kernel - Deliverables
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