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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/aio.h>
11#include <linux/falloc.h>
12
13#include "super.h"
14#include "mds_client.h"
15#include "cache.h"
16
17/*
18 * Ceph file operations
19 *
20 * Implement basic open/close functionality, and implement
21 * read/write.
22 *
23 * We implement three modes of file I/O:
24 * - buffered uses the generic_file_aio_{read,write} helpers
25 *
26 * - synchronous is used when there is multi-client read/write
27 * sharing, avoids the page cache, and synchronously waits for an
28 * ack from the OSD.
29 *
30 * - direct io takes the variant of the sync path that references
31 * user pages directly.
32 *
33 * fsync() flushes and waits on dirty pages, but just queues metadata
34 * for writeback: since the MDS can recover size and mtime there is no
35 * need to wait for MDS acknowledgement.
36 */
37
38
39/*
40 * Prepare an open request. Preallocate ceph_cap to avoid an
41 * inopportune ENOMEM later.
42 */
43static struct ceph_mds_request *
44prepare_open_request(struct super_block *sb, int flags, int create_mode)
45{
46 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
47 struct ceph_mds_client *mdsc = fsc->mdsc;
48 struct ceph_mds_request *req;
49 int want_auth = USE_ANY_MDS;
50 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
51
52 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
53 want_auth = USE_AUTH_MDS;
54
55 req = ceph_mdsc_create_request(mdsc, op, want_auth);
56 if (IS_ERR(req))
57 goto out;
58 req->r_fmode = ceph_flags_to_mode(flags);
59 req->r_args.open.flags = cpu_to_le32(flags);
60 req->r_args.open.mode = cpu_to_le32(create_mode);
61out:
62 return req;
63}
64
65/*
66 * initialize private struct file data.
67 * if we fail, clean up by dropping fmode reference on the ceph_inode
68 */
69static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
70{
71 struct ceph_file_info *cf;
72 int ret = 0;
73 struct ceph_inode_info *ci = ceph_inode(inode);
74 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
75 struct ceph_mds_client *mdsc = fsc->mdsc;
76
77 switch (inode->i_mode & S_IFMT) {
78 case S_IFREG:
79 /* First file open request creates the cookie, we want to keep
80 * this cookie around for the filetime of the inode as not to
81 * have to worry about fscache register / revoke / operation
82 * races.
83 *
84 * Also, if we know the operation is going to invalidate data
85 * (non readonly) just nuke the cache right away.
86 */
87 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
88 if ((fmode & CEPH_FILE_MODE_WR))
89 ceph_fscache_invalidate(inode);
90 case S_IFDIR:
91 dout("init_file %p %p 0%o (regular)\n", inode, file,
92 inode->i_mode);
93 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
94 if (cf == NULL) {
95 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
96 return -ENOMEM;
97 }
98 cf->fmode = fmode;
99 cf->next_offset = 2;
100 file->private_data = cf;
101 BUG_ON(inode->i_fop->release != ceph_release);
102 break;
103
104 case S_IFLNK:
105 dout("init_file %p %p 0%o (symlink)\n", inode, file,
106 inode->i_mode);
107 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
108 break;
109
110 default:
111 dout("init_file %p %p 0%o (special)\n", inode, file,
112 inode->i_mode);
113 /*
114 * we need to drop the open ref now, since we don't
115 * have .release set to ceph_release.
116 */
117 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
118 BUG_ON(inode->i_fop->release == ceph_release);
119
120 /* call the proper open fop */
121 ret = inode->i_fop->open(inode, file);
122 }
123 return ret;
124}
125
126/*
127 * If we already have the requisite capabilities, we can satisfy
128 * the open request locally (no need to request new caps from the
129 * MDS). We do, however, need to inform the MDS (asynchronously)
130 * if our wanted caps set expands.
131 */
132int ceph_open(struct inode *inode, struct file *file)
133{
134 struct ceph_inode_info *ci = ceph_inode(inode);
135 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
136 struct ceph_mds_client *mdsc = fsc->mdsc;
137 struct ceph_mds_request *req;
138 struct ceph_file_info *cf = file->private_data;
139 struct inode *parent_inode = NULL;
140 int err;
141 int flags, fmode, wanted;
142
143 if (cf) {
144 dout("open file %p is already opened\n", file);
145 return 0;
146 }
147
148 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
149 flags = file->f_flags & ~(O_CREAT|O_EXCL);
150 if (S_ISDIR(inode->i_mode))
151 flags = O_DIRECTORY; /* mds likes to know */
152
153 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
154 ceph_vinop(inode), file, flags, file->f_flags);
155 fmode = ceph_flags_to_mode(flags);
156 wanted = ceph_caps_for_mode(fmode);
157
158 /* snapped files are read-only */
159 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
160 return -EROFS;
161
162 /* trivially open snapdir */
163 if (ceph_snap(inode) == CEPH_SNAPDIR) {
164 spin_lock(&ci->i_ceph_lock);
165 __ceph_get_fmode(ci, fmode);
166 spin_unlock(&ci->i_ceph_lock);
167 return ceph_init_file(inode, file, fmode);
168 }
169
170 /*
171 * No need to block if we have caps on the auth MDS (for
172 * write) or any MDS (for read). Update wanted set
173 * asynchronously.
174 */
175 spin_lock(&ci->i_ceph_lock);
176 if (__ceph_is_any_real_caps(ci) &&
177 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
178 int mds_wanted = __ceph_caps_mds_wanted(ci);
179 int issued = __ceph_caps_issued(ci, NULL);
180
181 dout("open %p fmode %d want %s issued %s using existing\n",
182 inode, fmode, ceph_cap_string(wanted),
183 ceph_cap_string(issued));
184 __ceph_get_fmode(ci, fmode);
185 spin_unlock(&ci->i_ceph_lock);
186
187 /* adjust wanted? */
188 if ((issued & wanted) != wanted &&
189 (mds_wanted & wanted) != wanted &&
190 ceph_snap(inode) != CEPH_SNAPDIR)
191 ceph_check_caps(ci, 0, NULL);
192
193 return ceph_init_file(inode, file, fmode);
194 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
195 (ci->i_snap_caps & wanted) == wanted) {
196 __ceph_get_fmode(ci, fmode);
197 spin_unlock(&ci->i_ceph_lock);
198 return ceph_init_file(inode, file, fmode);
199 }
200
201 spin_unlock(&ci->i_ceph_lock);
202
203 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
204 req = prepare_open_request(inode->i_sb, flags, 0);
205 if (IS_ERR(req)) {
206 err = PTR_ERR(req);
207 goto out;
208 }
209 req->r_inode = inode;
210 ihold(inode);
211
212 req->r_num_caps = 1;
213 if (flags & O_CREAT)
214 parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
215 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
216 iput(parent_inode);
217 if (!err)
218 err = ceph_init_file(inode, file, req->r_fmode);
219 ceph_mdsc_put_request(req);
220 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
221out:
222 return err;
223}
224
225
226/*
227 * Do a lookup + open with a single request. If we get a non-existent
228 * file or symlink, return 1 so the VFS can retry.
229 */
230int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
231 struct file *file, unsigned flags, umode_t mode,
232 int *opened)
233{
234 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
235 struct ceph_mds_client *mdsc = fsc->mdsc;
236 struct ceph_mds_request *req;
237 struct dentry *dn;
238 int err;
239
240 dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
241 dir, dentry, dentry->d_name.len, dentry->d_name.name,
242 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
243
244 if (dentry->d_name.len > NAME_MAX)
245 return -ENAMETOOLONG;
246
247 err = ceph_init_dentry(dentry);
248 if (err < 0)
249 return err;
250
251 /* do the open */
252 req = prepare_open_request(dir->i_sb, flags, mode);
253 if (IS_ERR(req))
254 return PTR_ERR(req);
255 req->r_dentry = dget(dentry);
256 req->r_num_caps = 2;
257 if (flags & O_CREAT) {
258 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
259 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
260 }
261 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
262 err = ceph_mdsc_do_request(mdsc,
263 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
264 req);
265 if (err)
266 goto out_err;
267
268 err = ceph_handle_snapdir(req, dentry, err);
269 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
270 err = ceph_handle_notrace_create(dir, dentry);
271
272 if (d_unhashed(dentry)) {
273 dn = ceph_finish_lookup(req, dentry, err);
274 if (IS_ERR(dn))
275 err = PTR_ERR(dn);
276 } else {
277 /* we were given a hashed negative dentry */
278 dn = NULL;
279 }
280 if (err)
281 goto out_err;
282 if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
283 /* make vfs retry on splice, ENOENT, or symlink */
284 dout("atomic_open finish_no_open on dn %p\n", dn);
285 err = finish_no_open(file, dn);
286 } else {
287 dout("atomic_open finish_open on dn %p\n", dn);
288 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
289 ceph_init_acl(dentry, dentry->d_inode, dir);
290 *opened |= FILE_CREATED;
291 }
292 err = finish_open(file, dentry, ceph_open, opened);
293 }
294out_err:
295 if (!req->r_err && req->r_target_inode)
296 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
297 ceph_mdsc_put_request(req);
298 dout("atomic_open result=%d\n", err);
299 return err;
300}
301
302int ceph_release(struct inode *inode, struct file *file)
303{
304 struct ceph_inode_info *ci = ceph_inode(inode);
305 struct ceph_file_info *cf = file->private_data;
306
307 dout("release inode %p file %p\n", inode, file);
308 ceph_put_fmode(ci, cf->fmode);
309 if (cf->last_readdir)
310 ceph_mdsc_put_request(cf->last_readdir);
311 kfree(cf->last_name);
312 kfree(cf->dir_info);
313 dput(cf->dentry);
314 kmem_cache_free(ceph_file_cachep, cf);
315
316 /* wake up anyone waiting for caps on this inode */
317 wake_up_all(&ci->i_cap_wq);
318 return 0;
319}
320
321/*
322 * Read a range of bytes striped over one or more objects. Iterate over
323 * objects we stripe over. (That's not atomic, but good enough for now.)
324 *
325 * If we get a short result from the OSD, check against i_size; we need to
326 * only return a short read to the caller if we hit EOF.
327 */
328static int striped_read(struct inode *inode,
329 u64 off, u64 len,
330 struct page **pages, int num_pages,
331 int *checkeof, bool o_direct,
332 unsigned long buf_align)
333{
334 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
335 struct ceph_inode_info *ci = ceph_inode(inode);
336 u64 pos, this_len, left;
337 int io_align, page_align;
338 int pages_left;
339 int read;
340 struct page **page_pos;
341 int ret;
342 bool hit_stripe, was_short;
343
344 /*
345 * we may need to do multiple reads. not atomic, unfortunately.
346 */
347 pos = off;
348 left = len;
349 page_pos = pages;
350 pages_left = num_pages;
351 read = 0;
352 io_align = off & ~PAGE_MASK;
353
354more:
355 if (o_direct)
356 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
357 else
358 page_align = pos & ~PAGE_MASK;
359 this_len = left;
360 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
361 &ci->i_layout, pos, &this_len,
362 ci->i_truncate_seq,
363 ci->i_truncate_size,
364 page_pos, pages_left, page_align);
365 if (ret == -ENOENT)
366 ret = 0;
367 hit_stripe = this_len < left;
368 was_short = ret >= 0 && ret < this_len;
369 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
370 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
371
372 if (ret >= 0) {
373 int didpages;
374 if (was_short && (pos + ret < inode->i_size)) {
375 u64 tmp = min(this_len - ret,
376 inode->i_size - pos - ret);
377 dout(" zero gap %llu to %llu\n",
378 pos + ret, pos + ret + tmp);
379 ceph_zero_page_vector_range(page_align + read + ret,
380 tmp, pages);
381 ret += tmp;
382 }
383
384 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
385 pos += ret;
386 read = pos - off;
387 left -= ret;
388 page_pos += didpages;
389 pages_left -= didpages;
390
391 /* hit stripe and need continue*/
392 if (left && hit_stripe && pos < inode->i_size)
393 goto more;
394 }
395
396 if (read > 0) {
397 ret = read;
398 /* did we bounce off eof? */
399 if (pos + left > inode->i_size)
400 *checkeof = 1;
401 }
402
403 dout("striped_read returns %d\n", ret);
404 return ret;
405}
406
407/*
408 * Completely synchronous read and write methods. Direct from __user
409 * buffer to osd, or directly to user pages (if O_DIRECT).
410 *
411 * If the read spans object boundary, just do multiple reads.
412 */
413static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
414 int *checkeof)
415{
416 struct file *file = iocb->ki_filp;
417 struct inode *inode = file_inode(file);
418 struct page **pages;
419 u64 off = iocb->ki_pos;
420 int num_pages, ret;
421 size_t len = i->count;
422
423 dout("sync_read on file %p %llu~%u %s\n", file, off,
424 (unsigned)len,
425 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
426 /*
427 * flush any page cache pages in this range. this
428 * will make concurrent normal and sync io slow,
429 * but it will at least behave sensibly when they are
430 * in sequence.
431 */
432 ret = filemap_write_and_wait_range(inode->i_mapping, off,
433 off + len);
434 if (ret < 0)
435 return ret;
436
437 if (file->f_flags & O_DIRECT) {
438 while (iov_iter_count(i)) {
439 void __user *data = i->iov[0].iov_base + i->iov_offset;
440 size_t len = i->iov[0].iov_len - i->iov_offset;
441
442 num_pages = calc_pages_for((unsigned long)data, len);
443 pages = ceph_get_direct_page_vector(data,
444 num_pages, true);
445 if (IS_ERR(pages))
446 return PTR_ERR(pages);
447
448 ret = striped_read(inode, off, len,
449 pages, num_pages, checkeof,
450 1, (unsigned long)data & ~PAGE_MASK);
451 ceph_put_page_vector(pages, num_pages, true);
452
453 if (ret <= 0)
454 break;
455 off += ret;
456 iov_iter_advance(i, ret);
457 if (ret < len)
458 break;
459 }
460 } else {
461 num_pages = calc_pages_for(off, len);
462 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
463 if (IS_ERR(pages))
464 return PTR_ERR(pages);
465 ret = striped_read(inode, off, len, pages,
466 num_pages, checkeof, 0, 0);
467 if (ret > 0) {
468 int l, k = 0;
469 size_t left = len = ret;
470
471 while (left) {
472 void __user *data = i->iov[0].iov_base
473 + i->iov_offset;
474 l = min(i->iov[0].iov_len - i->iov_offset,
475 left);
476
477 ret = ceph_copy_page_vector_to_user(&pages[k],
478 data, off,
479 l);
480 if (ret > 0) {
481 iov_iter_advance(i, ret);
482 left -= ret;
483 off += ret;
484 k = calc_pages_for(iocb->ki_pos,
485 len - left + 1) - 1;
486 BUG_ON(k >= num_pages && left);
487 } else
488 break;
489 }
490 }
491 ceph_release_page_vector(pages, num_pages);
492 }
493
494 if (off > iocb->ki_pos) {
495 ret = off - iocb->ki_pos;
496 iocb->ki_pos = off;
497 }
498
499 dout("sync_read result %d\n", ret);
500 return ret;
501}
502
503/*
504 * Write commit request unsafe callback, called to tell us when a
505 * request is unsafe (that is, in flight--has been handed to the
506 * messenger to send to its target osd). It is called again when
507 * we've received a response message indicating the request is
508 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
509 * is completed early (and unsuccessfully) due to a timeout or
510 * interrupt.
511 *
512 * This is used if we requested both an ACK and ONDISK commit reply
513 * from the OSD.
514 */
515static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
516{
517 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
518
519 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
520 unsafe ? "un" : "");
521 if (unsafe) {
522 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
523 spin_lock(&ci->i_unsafe_lock);
524 list_add_tail(&req->r_unsafe_item,
525 &ci->i_unsafe_writes);
526 spin_unlock(&ci->i_unsafe_lock);
527 } else {
528 spin_lock(&ci->i_unsafe_lock);
529 list_del_init(&req->r_unsafe_item);
530 spin_unlock(&ci->i_unsafe_lock);
531 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
532 }
533}
534
535
536/*
537 * Synchronous write, straight from __user pointer or user pages.
538 *
539 * If write spans object boundary, just do multiple writes. (For a
540 * correct atomic write, we should e.g. take write locks on all
541 * objects, rollback on failure, etc.)
542 */
543static ssize_t
544ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
545 unsigned long nr_segs, size_t count)
546{
547 struct file *file = iocb->ki_filp;
548 struct inode *inode = file_inode(file);
549 struct ceph_inode_info *ci = ceph_inode(inode);
550 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
551 struct ceph_snap_context *snapc;
552 struct ceph_vino vino;
553 struct ceph_osd_request *req;
554 struct page **pages;
555 int num_pages;
556 int written = 0;
557 int flags;
558 int check_caps = 0;
559 int page_align;
560 int ret;
561 struct timespec mtime = CURRENT_TIME;
562 loff_t pos = iocb->ki_pos;
563 struct iov_iter i;
564
565 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
566 return -EROFS;
567
568 dout("sync_direct_write on file %p %lld~%u\n", file, pos,
569 (unsigned)count);
570
571 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
572 if (ret < 0)
573 return ret;
574
575 ret = invalidate_inode_pages2_range(inode->i_mapping,
576 pos >> PAGE_CACHE_SHIFT,
577 (pos + count) >> PAGE_CACHE_SHIFT);
578 if (ret < 0)
579 dout("invalidate_inode_pages2_range returned %d\n", ret);
580
581 flags = CEPH_OSD_FLAG_ORDERSNAP |
582 CEPH_OSD_FLAG_ONDISK |
583 CEPH_OSD_FLAG_WRITE;
584
585 iov_iter_init(&i, iov, nr_segs, count, 0);
586
587 while (iov_iter_count(&i) > 0) {
588 void __user *data = i.iov->iov_base + i.iov_offset;
589 u64 len = i.iov->iov_len - i.iov_offset;
590
591 page_align = (unsigned long)data & ~PAGE_MASK;
592
593 snapc = ci->i_snap_realm->cached_context;
594 vino = ceph_vino(inode);
595 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
596 vino, pos, &len,
597 2,/*include a 'startsync' command*/
598 CEPH_OSD_OP_WRITE, flags, snapc,
599 ci->i_truncate_seq,
600 ci->i_truncate_size,
601 false);
602 if (IS_ERR(req)) {
603 ret = PTR_ERR(req);
604 break;
605 }
606
607 num_pages = calc_pages_for(page_align, len);
608 pages = ceph_get_direct_page_vector(data, num_pages, false);
609 if (IS_ERR(pages)) {
610 ret = PTR_ERR(pages);
611 goto out;
612 }
613
614 /*
615 * throw out any page cache pages in this range. this
616 * may block.
617 */
618 truncate_inode_pages_range(inode->i_mapping, pos,
619 (pos+len) | (PAGE_CACHE_SIZE-1));
620 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
621 false, false);
622
623 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
624 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
625
626 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
627 if (!ret)
628 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
629
630 ceph_put_page_vector(pages, num_pages, false);
631
632out:
633 ceph_osdc_put_request(req);
634 if (ret == 0) {
635 pos += len;
636 written += len;
637 iov_iter_advance(&i, (size_t)len);
638
639 if (pos > i_size_read(inode)) {
640 check_caps = ceph_inode_set_size(inode, pos);
641 if (check_caps)
642 ceph_check_caps(ceph_inode(inode),
643 CHECK_CAPS_AUTHONLY,
644 NULL);
645 }
646 } else
647 break;
648 }
649
650 if (ret != -EOLDSNAPC && written > 0) {
651 iocb->ki_pos = pos;
652 ret = written;
653 }
654 return ret;
655}
656
657
658/*
659 * Synchronous write, straight from __user pointer or user pages.
660 *
661 * If write spans object boundary, just do multiple writes. (For a
662 * correct atomic write, we should e.g. take write locks on all
663 * objects, rollback on failure, etc.)
664 */
665static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
666 unsigned long nr_segs, size_t count)
667{
668 struct file *file = iocb->ki_filp;
669 struct inode *inode = file_inode(file);
670 struct ceph_inode_info *ci = ceph_inode(inode);
671 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
672 struct ceph_snap_context *snapc;
673 struct ceph_vino vino;
674 struct ceph_osd_request *req;
675 struct page **pages;
676 u64 len;
677 int num_pages;
678 int written = 0;
679 int flags;
680 int check_caps = 0;
681 int ret;
682 struct timespec mtime = CURRENT_TIME;
683 loff_t pos = iocb->ki_pos;
684 struct iov_iter i;
685
686 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
687 return -EROFS;
688
689 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
690
691 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
692 if (ret < 0)
693 return ret;
694
695 ret = invalidate_inode_pages2_range(inode->i_mapping,
696 pos >> PAGE_CACHE_SHIFT,
697 (pos + count) >> PAGE_CACHE_SHIFT);
698 if (ret < 0)
699 dout("invalidate_inode_pages2_range returned %d\n", ret);
700
701 flags = CEPH_OSD_FLAG_ORDERSNAP |
702 CEPH_OSD_FLAG_ONDISK |
703 CEPH_OSD_FLAG_WRITE |
704 CEPH_OSD_FLAG_ACK;
705
706 iov_iter_init(&i, iov, nr_segs, count, 0);
707
708 while ((len = iov_iter_count(&i)) > 0) {
709 size_t left;
710 int n;
711
712 snapc = ci->i_snap_realm->cached_context;
713 vino = ceph_vino(inode);
714 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
715 vino, pos, &len, 1,
716 CEPH_OSD_OP_WRITE, flags, snapc,
717 ci->i_truncate_seq,
718 ci->i_truncate_size,
719 false);
720 if (IS_ERR(req)) {
721 ret = PTR_ERR(req);
722 break;
723 }
724
725 /*
726 * write from beginning of first page,
727 * regardless of io alignment
728 */
729 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
730
731 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
732 if (IS_ERR(pages)) {
733 ret = PTR_ERR(pages);
734 goto out;
735 }
736
737 left = len;
738 for (n = 0; n < num_pages; n++) {
739 size_t plen = min_t(size_t, left, PAGE_SIZE);
740 ret = iov_iter_copy_from_user(pages[n], &i, 0, plen);
741 if (ret != plen) {
742 ret = -EFAULT;
743 break;
744 }
745 left -= ret;
746 iov_iter_advance(&i, ret);
747 }
748
749 if (ret < 0) {
750 ceph_release_page_vector(pages, num_pages);
751 goto out;
752 }
753
754 /* get a second commit callback */
755 req->r_unsafe_callback = ceph_sync_write_unsafe;
756 req->r_inode = inode;
757
758 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
759 false, true);
760
761 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
762 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
763
764 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
765 if (!ret)
766 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
767
768out:
769 ceph_osdc_put_request(req);
770 if (ret == 0) {
771 pos += len;
772 written += len;
773
774 if (pos > i_size_read(inode)) {
775 check_caps = ceph_inode_set_size(inode, pos);
776 if (check_caps)
777 ceph_check_caps(ceph_inode(inode),
778 CHECK_CAPS_AUTHONLY,
779 NULL);
780 }
781 } else
782 break;
783 }
784
785 if (ret != -EOLDSNAPC && written > 0) {
786 ret = written;
787 iocb->ki_pos = pos;
788 }
789 return ret;
790}
791
792/*
793 * Wrap generic_file_aio_read with checks for cap bits on the inode.
794 * Atomically grab references, so that those bits are not released
795 * back to the MDS mid-read.
796 *
797 * Hmm, the sync read case isn't actually async... should it be?
798 */
799static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
800 unsigned long nr_segs, loff_t pos)
801{
802 struct file *filp = iocb->ki_filp;
803 struct ceph_file_info *fi = filp->private_data;
804 size_t len = iocb->ki_nbytes;
805 struct inode *inode = file_inode(filp);
806 struct ceph_inode_info *ci = ceph_inode(inode);
807 ssize_t ret;
808 int want, got = 0;
809 int checkeof = 0, read = 0;
810
811again:
812 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
813 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
814
815 if (fi->fmode & CEPH_FILE_MODE_LAZY)
816 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
817 else
818 want = CEPH_CAP_FILE_CACHE;
819 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
820 if (ret < 0)
821 return ret;
822
823 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
824 (iocb->ki_filp->f_flags & O_DIRECT) ||
825 (fi->flags & CEPH_F_SYNC)) {
826 struct iov_iter i;
827
828 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
829 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
830 ceph_cap_string(got));
831
832 if (!read) {
833 ret = generic_segment_checks(iov, &nr_segs,
834 &len, VERIFY_WRITE);
835 if (ret)
836 goto out;
837 }
838
839 iov_iter_init(&i, iov, nr_segs, len, read);
840
841 /* hmm, this isn't really async... */
842 ret = ceph_sync_read(iocb, &i, &checkeof);
843 } else {
844 /*
845 * We can't modify the content of iov,
846 * so we only read from beginning.
847 */
848 if (read) {
849 iocb->ki_pos = pos;
850 len = iocb->ki_nbytes;
851 read = 0;
852 }
853 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
854 inode, ceph_vinop(inode), pos, (unsigned)len,
855 ceph_cap_string(got));
856
857 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
858 }
859out:
860 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
861 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
862 ceph_put_cap_refs(ci, got);
863
864 if (checkeof && ret >= 0) {
865 int statret = ceph_do_getattr(inode,
866 CEPH_STAT_CAP_SIZE);
867
868 /* hit EOF or hole? */
869 if (statret == 0 && iocb->ki_pos < inode->i_size &&
870 ret < len) {
871 dout("sync_read hit hole, ppos %lld < size %lld"
872 ", reading more\n", iocb->ki_pos,
873 inode->i_size);
874
875 read += ret;
876 len -= ret;
877 checkeof = 0;
878 goto again;
879 }
880 }
881
882 if (ret >= 0)
883 ret += read;
884
885 return ret;
886}
887
888/*
889 * Take cap references to avoid releasing caps to MDS mid-write.
890 *
891 * If we are synchronous, and write with an old snap context, the OSD
892 * may return EOLDSNAPC. In that case, retry the write.. _after_
893 * dropping our cap refs and allowing the pending snap to logically
894 * complete _before_ this write occurs.
895 *
896 * If we are near ENOSPC, write synchronously.
897 */
898static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
899 unsigned long nr_segs, loff_t pos)
900{
901 struct file *file = iocb->ki_filp;
902 struct ceph_file_info *fi = file->private_data;
903 struct inode *inode = file_inode(file);
904 struct ceph_inode_info *ci = ceph_inode(inode);
905 struct ceph_osd_client *osdc =
906 &ceph_sb_to_client(inode->i_sb)->client->osdc;
907 ssize_t count, written = 0;
908 int err, want, got;
909
910 if (ceph_snap(inode) != CEPH_NOSNAP)
911 return -EROFS;
912
913 mutex_lock(&inode->i_mutex);
914
915 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
916 if (err)
917 goto out;
918
919 /* We can write back this queue in page reclaim */
920 current->backing_dev_info = file->f_mapping->backing_dev_info;
921
922 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
923 if (err)
924 goto out;
925
926 if (count == 0)
927 goto out;
928
929 err = file_remove_suid(file);
930 if (err)
931 goto out;
932
933 err = file_update_time(file);
934 if (err)
935 goto out;
936
937retry_snap:
938 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
939 err = -ENOSPC;
940 goto out;
941 }
942
943 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
944 inode, ceph_vinop(inode), pos, count, inode->i_size);
945 if (fi->fmode & CEPH_FILE_MODE_LAZY)
946 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
947 else
948 want = CEPH_CAP_FILE_BUFFER;
949 got = 0;
950 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
951 if (err < 0)
952 goto out;
953
954 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
955 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
956
957 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
958 (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
959 mutex_unlock(&inode->i_mutex);
960 if (file->f_flags & O_DIRECT)
961 written = ceph_sync_direct_write(iocb, iov,
962 nr_segs, count);
963 else
964 written = ceph_sync_write(iocb, iov, nr_segs, count);
965 if (written == -EOLDSNAPC) {
966 dout("aio_write %p %llx.%llx %llu~%u"
967 "got EOLDSNAPC, retrying\n",
968 inode, ceph_vinop(inode),
969 pos, (unsigned)iov->iov_len);
970 mutex_lock(&inode->i_mutex);
971 goto retry_snap;
972 }
973 } else {
974 loff_t old_size = inode->i_size;
975 struct iov_iter from;
976 /*
977 * No need to acquire the i_truncate_mutex. Because
978 * the MDS revokes Fwb caps before sending truncate
979 * message to us. We can't get Fwb cap while there
980 * are pending vmtruncate. So write and vmtruncate
981 * can not run at the same time
982 */
983 iov_iter_init(&from, iov, nr_segs, count, 0);
984 written = generic_perform_write(file, &from, pos);
985 if (likely(written >= 0))
986 iocb->ki_pos = pos + written;
987 if (inode->i_size > old_size)
988 ceph_fscache_update_objectsize(inode);
989 mutex_unlock(&inode->i_mutex);
990 }
991
992 if (written >= 0) {
993 int dirty;
994 spin_lock(&ci->i_ceph_lock);
995 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
996 spin_unlock(&ci->i_ceph_lock);
997 if (dirty)
998 __mark_inode_dirty(inode, dirty);
999 }
1000
1001 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1002 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
1003 ceph_cap_string(got));
1004 ceph_put_cap_refs(ci, got);
1005
1006 if (written >= 0 &&
1007 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1008 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1009 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1010 if (err < 0)
1011 written = err;
1012 }
1013
1014 goto out_unlocked;
1015
1016out:
1017 mutex_unlock(&inode->i_mutex);
1018out_unlocked:
1019 current->backing_dev_info = NULL;
1020 return written ? written : err;
1021}
1022
1023/*
1024 * llseek. be sure to verify file size on SEEK_END.
1025 */
1026static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1027{
1028 struct inode *inode = file->f_mapping->host;
1029 int ret;
1030
1031 mutex_lock(&inode->i_mutex);
1032
1033 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1034 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
1035 if (ret < 0) {
1036 offset = ret;
1037 goto out;
1038 }
1039 }
1040
1041 switch (whence) {
1042 case SEEK_END:
1043 offset += inode->i_size;
1044 break;
1045 case SEEK_CUR:
1046 /*
1047 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1048 * position-querying operation. Avoid rewriting the "same"
1049 * f_pos value back to the file because a concurrent read(),
1050 * write() or lseek() might have altered it
1051 */
1052 if (offset == 0) {
1053 offset = file->f_pos;
1054 goto out;
1055 }
1056 offset += file->f_pos;
1057 break;
1058 case SEEK_DATA:
1059 if (offset >= inode->i_size) {
1060 ret = -ENXIO;
1061 goto out;
1062 }
1063 break;
1064 case SEEK_HOLE:
1065 if (offset >= inode->i_size) {
1066 ret = -ENXIO;
1067 goto out;
1068 }
1069 offset = inode->i_size;
1070 break;
1071 }
1072
1073 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1074
1075out:
1076 mutex_unlock(&inode->i_mutex);
1077 return offset;
1078}
1079
1080static inline void ceph_zero_partial_page(
1081 struct inode *inode, loff_t offset, unsigned size)
1082{
1083 struct page *page;
1084 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1085
1086 page = find_lock_page(inode->i_mapping, index);
1087 if (page) {
1088 wait_on_page_writeback(page);
1089 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1090 unlock_page(page);
1091 page_cache_release(page);
1092 }
1093}
1094
1095static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1096 loff_t length)
1097{
1098 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1099 if (offset < nearly) {
1100 loff_t size = nearly - offset;
1101 if (length < size)
1102 size = length;
1103 ceph_zero_partial_page(inode, offset, size);
1104 offset += size;
1105 length -= size;
1106 }
1107 if (length >= PAGE_CACHE_SIZE) {
1108 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1109 truncate_pagecache_range(inode, offset, offset + size - 1);
1110 offset += size;
1111 length -= size;
1112 }
1113 if (length)
1114 ceph_zero_partial_page(inode, offset, length);
1115}
1116
1117static int ceph_zero_partial_object(struct inode *inode,
1118 loff_t offset, loff_t *length)
1119{
1120 struct ceph_inode_info *ci = ceph_inode(inode);
1121 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1122 struct ceph_osd_request *req;
1123 int ret = 0;
1124 loff_t zero = 0;
1125 int op;
1126
1127 if (!length) {
1128 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1129 length = &zero;
1130 } else {
1131 op = CEPH_OSD_OP_ZERO;
1132 }
1133
1134 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1135 ceph_vino(inode),
1136 offset, length,
1137 1, op,
1138 CEPH_OSD_FLAG_WRITE |
1139 CEPH_OSD_FLAG_ONDISK,
1140 NULL, 0, 0, false);
1141 if (IS_ERR(req)) {
1142 ret = PTR_ERR(req);
1143 goto out;
1144 }
1145
1146 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1147 &inode->i_mtime);
1148
1149 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1150 if (!ret) {
1151 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1152 if (ret == -ENOENT)
1153 ret = 0;
1154 }
1155 ceph_osdc_put_request(req);
1156
1157out:
1158 return ret;
1159}
1160
1161static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1162{
1163 int ret = 0;
1164 struct ceph_inode_info *ci = ceph_inode(inode);
1165 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1166 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1167 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1168 u64 object_set_size = object_size * stripe_count;
1169 u64 nearly, t;
1170
1171 /* round offset up to next period boundary */
1172 nearly = offset + object_set_size - 1;
1173 t = nearly;
1174 nearly -= do_div(t, object_set_size);
1175
1176 while (length && offset < nearly) {
1177 loff_t size = length;
1178 ret = ceph_zero_partial_object(inode, offset, &size);
1179 if (ret < 0)
1180 return ret;
1181 offset += size;
1182 length -= size;
1183 }
1184 while (length >= object_set_size) {
1185 int i;
1186 loff_t pos = offset;
1187 for (i = 0; i < stripe_count; ++i) {
1188 ret = ceph_zero_partial_object(inode, pos, NULL);
1189 if (ret < 0)
1190 return ret;
1191 pos += stripe_unit;
1192 }
1193 offset += object_set_size;
1194 length -= object_set_size;
1195 }
1196 while (length) {
1197 loff_t size = length;
1198 ret = ceph_zero_partial_object(inode, offset, &size);
1199 if (ret < 0)
1200 return ret;
1201 offset += size;
1202 length -= size;
1203 }
1204 return ret;
1205}
1206
1207static long ceph_fallocate(struct file *file, int mode,
1208 loff_t offset, loff_t length)
1209{
1210 struct ceph_file_info *fi = file->private_data;
1211 struct inode *inode = file_inode(file);
1212 struct ceph_inode_info *ci = ceph_inode(inode);
1213 struct ceph_osd_client *osdc =
1214 &ceph_inode_to_client(inode)->client->osdc;
1215 int want, got = 0;
1216 int dirty;
1217 int ret = 0;
1218 loff_t endoff = 0;
1219 loff_t size;
1220
1221 if (!S_ISREG(inode->i_mode))
1222 return -EOPNOTSUPP;
1223
1224 mutex_lock(&inode->i_mutex);
1225
1226 if (ceph_snap(inode) != CEPH_NOSNAP) {
1227 ret = -EROFS;
1228 goto unlock;
1229 }
1230
1231 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1232 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1233 ret = -ENOSPC;
1234 goto unlock;
1235 }
1236
1237 size = i_size_read(inode);
1238 if (!(mode & FALLOC_FL_KEEP_SIZE))
1239 endoff = offset + length;
1240
1241 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1242 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1243 else
1244 want = CEPH_CAP_FILE_BUFFER;
1245
1246 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
1247 if (ret < 0)
1248 goto unlock;
1249
1250 if (mode & FALLOC_FL_PUNCH_HOLE) {
1251 if (offset < size)
1252 ceph_zero_pagecache_range(inode, offset, length);
1253 ret = ceph_zero_objects(inode, offset, length);
1254 } else if (endoff > size) {
1255 truncate_pagecache_range(inode, size, -1);
1256 if (ceph_inode_set_size(inode, endoff))
1257 ceph_check_caps(ceph_inode(inode),
1258 CHECK_CAPS_AUTHONLY, NULL);
1259 }
1260
1261 if (!ret) {
1262 spin_lock(&ci->i_ceph_lock);
1263 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1264 spin_unlock(&ci->i_ceph_lock);
1265 if (dirty)
1266 __mark_inode_dirty(inode, dirty);
1267 }
1268
1269 ceph_put_cap_refs(ci, got);
1270unlock:
1271 mutex_unlock(&inode->i_mutex);
1272 return ret;
1273}
1274
1275const struct file_operations ceph_file_fops = {
1276 .open = ceph_open,
1277 .release = ceph_release,
1278 .llseek = ceph_llseek,
1279 .read = do_sync_read,
1280 .write = do_sync_write,
1281 .aio_read = ceph_aio_read,
1282 .aio_write = ceph_aio_write,
1283 .mmap = ceph_mmap,
1284 .fsync = ceph_fsync,
1285 .lock = ceph_lock,
1286 .flock = ceph_flock,
1287 .splice_read = generic_file_splice_read,
1288 .splice_write = generic_file_splice_write,
1289 .unlocked_ioctl = ceph_ioctl,
1290 .compat_ioctl = ceph_ioctl,
1291 .fallocate = ceph_fallocate,
1292};
1293
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/namei.h>
8#include <linux/writeback.h>
9
10#include "super.h"
11#include "mds_client.h"
12
13/*
14 * Ceph file operations
15 *
16 * Implement basic open/close functionality, and implement
17 * read/write.
18 *
19 * We implement three modes of file I/O:
20 * - buffered uses the generic_file_aio_{read,write} helpers
21 *
22 * - synchronous is used when there is multi-client read/write
23 * sharing, avoids the page cache, and synchronously waits for an
24 * ack from the OSD.
25 *
26 * - direct io takes the variant of the sync path that references
27 * user pages directly.
28 *
29 * fsync() flushes and waits on dirty pages, but just queues metadata
30 * for writeback: since the MDS can recover size and mtime there is no
31 * need to wait for MDS acknowledgement.
32 */
33
34
35/*
36 * Prepare an open request. Preallocate ceph_cap to avoid an
37 * inopportune ENOMEM later.
38 */
39static struct ceph_mds_request *
40prepare_open_request(struct super_block *sb, int flags, int create_mode)
41{
42 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
43 struct ceph_mds_client *mdsc = fsc->mdsc;
44 struct ceph_mds_request *req;
45 int want_auth = USE_ANY_MDS;
46 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
47
48 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
49 want_auth = USE_AUTH_MDS;
50
51 req = ceph_mdsc_create_request(mdsc, op, want_auth);
52 if (IS_ERR(req))
53 goto out;
54 req->r_fmode = ceph_flags_to_mode(flags);
55 req->r_args.open.flags = cpu_to_le32(flags);
56 req->r_args.open.mode = cpu_to_le32(create_mode);
57 req->r_args.open.preferred = cpu_to_le32(-1);
58out:
59 return req;
60}
61
62/*
63 * initialize private struct file data.
64 * if we fail, clean up by dropping fmode reference on the ceph_inode
65 */
66static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
67{
68 struct ceph_file_info *cf;
69 int ret = 0;
70
71 switch (inode->i_mode & S_IFMT) {
72 case S_IFREG:
73 case S_IFDIR:
74 dout("init_file %p %p 0%o (regular)\n", inode, file,
75 inode->i_mode);
76 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
77 if (cf == NULL) {
78 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
79 return -ENOMEM;
80 }
81 cf->fmode = fmode;
82 cf->next_offset = 2;
83 file->private_data = cf;
84 BUG_ON(inode->i_fop->release != ceph_release);
85 break;
86
87 case S_IFLNK:
88 dout("init_file %p %p 0%o (symlink)\n", inode, file,
89 inode->i_mode);
90 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
91 break;
92
93 default:
94 dout("init_file %p %p 0%o (special)\n", inode, file,
95 inode->i_mode);
96 /*
97 * we need to drop the open ref now, since we don't
98 * have .release set to ceph_release.
99 */
100 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
101 BUG_ON(inode->i_fop->release == ceph_release);
102
103 /* call the proper open fop */
104 ret = inode->i_fop->open(inode, file);
105 }
106 return ret;
107}
108
109/*
110 * If the filp already has private_data, that means the file was
111 * already opened by intent during lookup, and we do nothing.
112 *
113 * If we already have the requisite capabilities, we can satisfy
114 * the open request locally (no need to request new caps from the
115 * MDS). We do, however, need to inform the MDS (asynchronously)
116 * if our wanted caps set expands.
117 */
118int ceph_open(struct inode *inode, struct file *file)
119{
120 struct ceph_inode_info *ci = ceph_inode(inode);
121 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
122 struct ceph_mds_client *mdsc = fsc->mdsc;
123 struct ceph_mds_request *req;
124 struct ceph_file_info *cf = file->private_data;
125 struct inode *parent_inode = NULL;
126 int err;
127 int flags, fmode, wanted;
128
129 if (cf) {
130 dout("open file %p is already opened\n", file);
131 return 0;
132 }
133
134 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
135 flags = file->f_flags & ~(O_CREAT|O_EXCL);
136 if (S_ISDIR(inode->i_mode))
137 flags = O_DIRECTORY; /* mds likes to know */
138
139 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
140 ceph_vinop(inode), file, flags, file->f_flags);
141 fmode = ceph_flags_to_mode(flags);
142 wanted = ceph_caps_for_mode(fmode);
143
144 /* snapped files are read-only */
145 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
146 return -EROFS;
147
148 /* trivially open snapdir */
149 if (ceph_snap(inode) == CEPH_SNAPDIR) {
150 spin_lock(&inode->i_lock);
151 __ceph_get_fmode(ci, fmode);
152 spin_unlock(&inode->i_lock);
153 return ceph_init_file(inode, file, fmode);
154 }
155
156 /*
157 * No need to block if we have caps on the auth MDS (for
158 * write) or any MDS (for read). Update wanted set
159 * asynchronously.
160 */
161 spin_lock(&inode->i_lock);
162 if (__ceph_is_any_real_caps(ci) &&
163 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
164 int mds_wanted = __ceph_caps_mds_wanted(ci);
165 int issued = __ceph_caps_issued(ci, NULL);
166
167 dout("open %p fmode %d want %s issued %s using existing\n",
168 inode, fmode, ceph_cap_string(wanted),
169 ceph_cap_string(issued));
170 __ceph_get_fmode(ci, fmode);
171 spin_unlock(&inode->i_lock);
172
173 /* adjust wanted? */
174 if ((issued & wanted) != wanted &&
175 (mds_wanted & wanted) != wanted &&
176 ceph_snap(inode) != CEPH_SNAPDIR)
177 ceph_check_caps(ci, 0, NULL);
178
179 return ceph_init_file(inode, file, fmode);
180 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
181 (ci->i_snap_caps & wanted) == wanted) {
182 __ceph_get_fmode(ci, fmode);
183 spin_unlock(&inode->i_lock);
184 return ceph_init_file(inode, file, fmode);
185 }
186 spin_unlock(&inode->i_lock);
187
188 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
189 req = prepare_open_request(inode->i_sb, flags, 0);
190 if (IS_ERR(req)) {
191 err = PTR_ERR(req);
192 goto out;
193 }
194 req->r_inode = inode;
195 ihold(inode);
196 req->r_num_caps = 1;
197 if (flags & (O_CREAT|O_TRUNC))
198 parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
199 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
200 iput(parent_inode);
201 if (!err)
202 err = ceph_init_file(inode, file, req->r_fmode);
203 ceph_mdsc_put_request(req);
204 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
205out:
206 return err;
207}
208
209
210/*
211 * Do a lookup + open with a single request.
212 *
213 * If this succeeds, but some subsequent check in the vfs
214 * may_open() fails, the struct *file gets cleaned up (i.e.
215 * ceph_release gets called). So fear not!
216 */
217/*
218 * flags
219 * path_lookup_open -> LOOKUP_OPEN
220 * path_lookup_create -> LOOKUP_OPEN|LOOKUP_CREATE
221 */
222struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
223 struct nameidata *nd, int mode,
224 int locked_dir)
225{
226 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
227 struct ceph_mds_client *mdsc = fsc->mdsc;
228 struct file *file;
229 struct ceph_mds_request *req;
230 struct dentry *ret;
231 int err;
232 int flags = nd->intent.open.flags;
233
234 dout("ceph_lookup_open dentry %p '%.*s' flags %d mode 0%o\n",
235 dentry, dentry->d_name.len, dentry->d_name.name, flags, mode);
236
237 /* do the open */
238 req = prepare_open_request(dir->i_sb, flags, mode);
239 if (IS_ERR(req))
240 return ERR_CAST(req);
241 req->r_dentry = dget(dentry);
242 req->r_num_caps = 2;
243 if (flags & O_CREAT) {
244 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
245 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
246 }
247 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
248 err = ceph_mdsc_do_request(mdsc,
249 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
250 req);
251 err = ceph_handle_snapdir(req, dentry, err);
252 if (err)
253 goto out;
254 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
255 err = ceph_handle_notrace_create(dir, dentry);
256 if (err)
257 goto out;
258 file = lookup_instantiate_filp(nd, req->r_dentry, ceph_open);
259 if (IS_ERR(file))
260 err = PTR_ERR(file);
261out:
262 ret = ceph_finish_lookup(req, dentry, err);
263 ceph_mdsc_put_request(req);
264 dout("ceph_lookup_open result=%p\n", ret);
265 return ret;
266}
267
268int ceph_release(struct inode *inode, struct file *file)
269{
270 struct ceph_inode_info *ci = ceph_inode(inode);
271 struct ceph_file_info *cf = file->private_data;
272
273 dout("release inode %p file %p\n", inode, file);
274 ceph_put_fmode(ci, cf->fmode);
275 if (cf->last_readdir)
276 ceph_mdsc_put_request(cf->last_readdir);
277 kfree(cf->last_name);
278 kfree(cf->dir_info);
279 dput(cf->dentry);
280 kmem_cache_free(ceph_file_cachep, cf);
281
282 /* wake up anyone waiting for caps on this inode */
283 wake_up_all(&ci->i_cap_wq);
284 return 0;
285}
286
287/*
288 * Read a range of bytes striped over one or more objects. Iterate over
289 * objects we stripe over. (That's not atomic, but good enough for now.)
290 *
291 * If we get a short result from the OSD, check against i_size; we need to
292 * only return a short read to the caller if we hit EOF.
293 */
294static int striped_read(struct inode *inode,
295 u64 off, u64 len,
296 struct page **pages, int num_pages,
297 int *checkeof, bool o_direct,
298 unsigned long buf_align)
299{
300 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
301 struct ceph_inode_info *ci = ceph_inode(inode);
302 u64 pos, this_len;
303 int io_align, page_align;
304 int left, pages_left;
305 int read;
306 struct page **page_pos;
307 int ret;
308 bool hit_stripe, was_short;
309
310 /*
311 * we may need to do multiple reads. not atomic, unfortunately.
312 */
313 pos = off;
314 left = len;
315 page_pos = pages;
316 pages_left = num_pages;
317 read = 0;
318 io_align = off & ~PAGE_MASK;
319
320more:
321 if (o_direct)
322 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
323 else
324 page_align = pos & ~PAGE_MASK;
325 this_len = left;
326 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
327 &ci->i_layout, pos, &this_len,
328 ci->i_truncate_seq,
329 ci->i_truncate_size,
330 page_pos, pages_left, page_align);
331 if (ret == -ENOENT)
332 ret = 0;
333 hit_stripe = this_len < left;
334 was_short = ret >= 0 && ret < this_len;
335 dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
336 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
337
338 if (ret > 0) {
339 int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
340
341 if (read < pos - off) {
342 dout(" zero gap %llu to %llu\n", off + read, pos);
343 ceph_zero_page_vector_range(page_align + read,
344 pos - off - read, pages);
345 }
346 pos += ret;
347 read = pos - off;
348 left -= ret;
349 page_pos += didpages;
350 pages_left -= didpages;
351
352 /* hit stripe? */
353 if (left && hit_stripe)
354 goto more;
355 }
356
357 if (was_short) {
358 /* did we bounce off eof? */
359 if (pos + left > inode->i_size)
360 *checkeof = 1;
361
362 /* zero trailing bytes (inside i_size) */
363 if (left > 0 && pos < inode->i_size) {
364 if (pos + left > inode->i_size)
365 left = inode->i_size - pos;
366
367 dout("zero tail %d\n", left);
368 ceph_zero_page_vector_range(page_align + read, left,
369 pages);
370 read += left;
371 }
372 }
373
374 if (ret >= 0)
375 ret = read;
376 dout("striped_read returns %d\n", ret);
377 return ret;
378}
379
380/*
381 * Completely synchronous read and write methods. Direct from __user
382 * buffer to osd, or directly to user pages (if O_DIRECT).
383 *
384 * If the read spans object boundary, just do multiple reads.
385 */
386static ssize_t ceph_sync_read(struct file *file, char __user *data,
387 unsigned len, loff_t *poff, int *checkeof)
388{
389 struct inode *inode = file->f_dentry->d_inode;
390 struct page **pages;
391 u64 off = *poff;
392 int num_pages, ret;
393
394 dout("sync_read on file %p %llu~%u %s\n", file, off, len,
395 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
396
397 if (file->f_flags & O_DIRECT) {
398 num_pages = calc_pages_for((unsigned long)data, len);
399 pages = ceph_get_direct_page_vector(data, num_pages, true);
400 } else {
401 num_pages = calc_pages_for(off, len);
402 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
403 }
404 if (IS_ERR(pages))
405 return PTR_ERR(pages);
406
407 /*
408 * flush any page cache pages in this range. this
409 * will make concurrent normal and sync io slow,
410 * but it will at least behave sensibly when they are
411 * in sequence.
412 */
413 ret = filemap_write_and_wait(inode->i_mapping);
414 if (ret < 0)
415 goto done;
416
417 ret = striped_read(inode, off, len, pages, num_pages, checkeof,
418 file->f_flags & O_DIRECT,
419 (unsigned long)data & ~PAGE_MASK);
420
421 if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
422 ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
423 if (ret >= 0)
424 *poff = off + ret;
425
426done:
427 if (file->f_flags & O_DIRECT)
428 ceph_put_page_vector(pages, num_pages, true);
429 else
430 ceph_release_page_vector(pages, num_pages);
431 dout("sync_read result %d\n", ret);
432 return ret;
433}
434
435/*
436 * Write commit callback, called if we requested both an ACK and
437 * ONDISK commit reply from the OSD.
438 */
439static void sync_write_commit(struct ceph_osd_request *req,
440 struct ceph_msg *msg)
441{
442 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
443
444 dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
445 spin_lock(&ci->i_unsafe_lock);
446 list_del_init(&req->r_unsafe_item);
447 spin_unlock(&ci->i_unsafe_lock);
448 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
449}
450
451/*
452 * Synchronous write, straight from __user pointer or user pages (if
453 * O_DIRECT).
454 *
455 * If write spans object boundary, just do multiple writes. (For a
456 * correct atomic write, we should e.g. take write locks on all
457 * objects, rollback on failure, etc.)
458 */
459static ssize_t ceph_sync_write(struct file *file, const char __user *data,
460 size_t left, loff_t *offset)
461{
462 struct inode *inode = file->f_dentry->d_inode;
463 struct ceph_inode_info *ci = ceph_inode(inode);
464 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
465 struct ceph_osd_request *req;
466 struct page **pages;
467 int num_pages;
468 long long unsigned pos;
469 u64 len;
470 int written = 0;
471 int flags;
472 int do_sync = 0;
473 int check_caps = 0;
474 int page_align, io_align;
475 unsigned long buf_align;
476 int ret;
477 struct timespec mtime = CURRENT_TIME;
478
479 if (ceph_snap(file->f_dentry->d_inode) != CEPH_NOSNAP)
480 return -EROFS;
481
482 dout("sync_write on file %p %lld~%u %s\n", file, *offset,
483 (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
484
485 if (file->f_flags & O_APPEND)
486 pos = i_size_read(inode);
487 else
488 pos = *offset;
489
490 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
491 if (ret < 0)
492 return ret;
493
494 ret = invalidate_inode_pages2_range(inode->i_mapping,
495 pos >> PAGE_CACHE_SHIFT,
496 (pos + left) >> PAGE_CACHE_SHIFT);
497 if (ret < 0)
498 dout("invalidate_inode_pages2_range returned %d\n", ret);
499
500 flags = CEPH_OSD_FLAG_ORDERSNAP |
501 CEPH_OSD_FLAG_ONDISK |
502 CEPH_OSD_FLAG_WRITE;
503 if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
504 flags |= CEPH_OSD_FLAG_ACK;
505 else
506 do_sync = 1;
507
508 /*
509 * we may need to do multiple writes here if we span an object
510 * boundary. this isn't atomic, unfortunately. :(
511 */
512more:
513 io_align = pos & ~PAGE_MASK;
514 buf_align = (unsigned long)data & ~PAGE_MASK;
515 len = left;
516 if (file->f_flags & O_DIRECT) {
517 /* write from beginning of first page, regardless of
518 io alignment */
519 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
520 num_pages = calc_pages_for((unsigned long)data, len);
521 } else {
522 page_align = pos & ~PAGE_MASK;
523 num_pages = calc_pages_for(pos, len);
524 }
525 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
526 ceph_vino(inode), pos, &len,
527 CEPH_OSD_OP_WRITE, flags,
528 ci->i_snap_realm->cached_context,
529 do_sync,
530 ci->i_truncate_seq, ci->i_truncate_size,
531 &mtime, false, 2, page_align);
532 if (!req)
533 return -ENOMEM;
534
535 if (file->f_flags & O_DIRECT) {
536 pages = ceph_get_direct_page_vector(data, num_pages, false);
537 if (IS_ERR(pages)) {
538 ret = PTR_ERR(pages);
539 goto out;
540 }
541
542 /*
543 * throw out any page cache pages in this range. this
544 * may block.
545 */
546 truncate_inode_pages_range(inode->i_mapping, pos,
547 (pos+len) | (PAGE_CACHE_SIZE-1));
548 } else {
549 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
550 if (IS_ERR(pages)) {
551 ret = PTR_ERR(pages);
552 goto out;
553 }
554 ret = ceph_copy_user_to_page_vector(pages, data, pos, len);
555 if (ret < 0) {
556 ceph_release_page_vector(pages, num_pages);
557 goto out;
558 }
559
560 if ((file->f_flags & O_SYNC) == 0) {
561 /* get a second commit callback */
562 req->r_safe_callback = sync_write_commit;
563 req->r_own_pages = 1;
564 }
565 }
566 req->r_pages = pages;
567 req->r_num_pages = num_pages;
568 req->r_inode = inode;
569
570 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
571 if (!ret) {
572 if (req->r_safe_callback) {
573 /*
574 * Add to inode unsafe list only after we
575 * start_request so that a tid has been assigned.
576 */
577 spin_lock(&ci->i_unsafe_lock);
578 list_add_tail(&req->r_unsafe_item,
579 &ci->i_unsafe_writes);
580 spin_unlock(&ci->i_unsafe_lock);
581 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
582 }
583
584 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
585 if (ret < 0 && req->r_safe_callback) {
586 spin_lock(&ci->i_unsafe_lock);
587 list_del_init(&req->r_unsafe_item);
588 spin_unlock(&ci->i_unsafe_lock);
589 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
590 }
591 }
592
593 if (file->f_flags & O_DIRECT)
594 ceph_put_page_vector(pages, num_pages, false);
595 else if (file->f_flags & O_SYNC)
596 ceph_release_page_vector(pages, num_pages);
597
598out:
599 ceph_osdc_put_request(req);
600 if (ret == 0) {
601 pos += len;
602 written += len;
603 left -= len;
604 data += written;
605 if (left)
606 goto more;
607
608 ret = written;
609 *offset = pos;
610 if (pos > i_size_read(inode))
611 check_caps = ceph_inode_set_size(inode, pos);
612 if (check_caps)
613 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
614 NULL);
615 }
616 return ret;
617}
618
619/*
620 * Wrap generic_file_aio_read with checks for cap bits on the inode.
621 * Atomically grab references, so that those bits are not released
622 * back to the MDS mid-read.
623 *
624 * Hmm, the sync read case isn't actually async... should it be?
625 */
626static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
627 unsigned long nr_segs, loff_t pos)
628{
629 struct file *filp = iocb->ki_filp;
630 struct ceph_file_info *fi = filp->private_data;
631 loff_t *ppos = &iocb->ki_pos;
632 size_t len = iov->iov_len;
633 struct inode *inode = filp->f_dentry->d_inode;
634 struct ceph_inode_info *ci = ceph_inode(inode);
635 void __user *base = iov->iov_base;
636 ssize_t ret;
637 int want, got = 0;
638 int checkeof = 0, read = 0;
639
640 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
641 inode, ceph_vinop(inode), pos, (unsigned)len, inode);
642again:
643 __ceph_do_pending_vmtruncate(inode);
644 if (fi->fmode & CEPH_FILE_MODE_LAZY)
645 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
646 else
647 want = CEPH_CAP_FILE_CACHE;
648 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
649 if (ret < 0)
650 goto out;
651 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
652 inode, ceph_vinop(inode), pos, (unsigned)len,
653 ceph_cap_string(got));
654
655 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
656 (iocb->ki_filp->f_flags & O_DIRECT) ||
657 (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
658 (fi->flags & CEPH_F_SYNC))
659 /* hmm, this isn't really async... */
660 ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
661 else
662 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
663
664out:
665 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
666 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
667 ceph_put_cap_refs(ci, got);
668
669 if (checkeof && ret >= 0) {
670 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
671
672 /* hit EOF or hole? */
673 if (statret == 0 && *ppos < inode->i_size) {
674 dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
675 read += ret;
676 base += ret;
677 len -= ret;
678 checkeof = 0;
679 goto again;
680 }
681 }
682 if (ret >= 0)
683 ret += read;
684
685 return ret;
686}
687
688/*
689 * Take cap references to avoid releasing caps to MDS mid-write.
690 *
691 * If we are synchronous, and write with an old snap context, the OSD
692 * may return EOLDSNAPC. In that case, retry the write.. _after_
693 * dropping our cap refs and allowing the pending snap to logically
694 * complete _before_ this write occurs.
695 *
696 * If we are near ENOSPC, write synchronously.
697 */
698static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
699 unsigned long nr_segs, loff_t pos)
700{
701 struct file *file = iocb->ki_filp;
702 struct ceph_file_info *fi = file->private_data;
703 struct inode *inode = file->f_dentry->d_inode;
704 struct ceph_inode_info *ci = ceph_inode(inode);
705 struct ceph_osd_client *osdc =
706 &ceph_sb_to_client(inode->i_sb)->client->osdc;
707 loff_t endoff = pos + iov->iov_len;
708 int want, got = 0;
709 int ret, err;
710
711 if (ceph_snap(inode) != CEPH_NOSNAP)
712 return -EROFS;
713
714retry_snap:
715 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
716 return -ENOSPC;
717 __ceph_do_pending_vmtruncate(inode);
718 dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
719 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
720 inode->i_size);
721 if (fi->fmode & CEPH_FILE_MODE_LAZY)
722 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
723 else
724 want = CEPH_CAP_FILE_BUFFER;
725 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
726 if (ret < 0)
727 goto out_put;
728
729 dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
730 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
731 ceph_cap_string(got));
732
733 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
734 (iocb->ki_filp->f_flags & O_DIRECT) ||
735 (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
736 (fi->flags & CEPH_F_SYNC)) {
737 ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
738 &iocb->ki_pos);
739 } else {
740 /*
741 * buffered write; drop Fw early to avoid slow
742 * revocation if we get stuck on balance_dirty_pages
743 */
744 int dirty;
745
746 spin_lock(&inode->i_lock);
747 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
748 spin_unlock(&inode->i_lock);
749 ceph_put_cap_refs(ci, got);
750
751 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
752 if ((ret >= 0 || ret == -EIOCBQUEUED) &&
753 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
754 || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
755 err = vfs_fsync_range(file, pos, pos + ret - 1, 1);
756 if (err < 0)
757 ret = err;
758 }
759
760 if (dirty)
761 __mark_inode_dirty(inode, dirty);
762 goto out;
763 }
764
765 if (ret >= 0) {
766 int dirty;
767 spin_lock(&inode->i_lock);
768 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
769 spin_unlock(&inode->i_lock);
770 if (dirty)
771 __mark_inode_dirty(inode, dirty);
772 }
773
774out_put:
775 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
776 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
777 ceph_cap_string(got));
778 ceph_put_cap_refs(ci, got);
779
780out:
781 if (ret == -EOLDSNAPC) {
782 dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
783 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
784 goto retry_snap;
785 }
786
787 return ret;
788}
789
790/*
791 * llseek. be sure to verify file size on SEEK_END.
792 */
793static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
794{
795 struct inode *inode = file->f_mapping->host;
796 int ret;
797
798 mutex_lock(&inode->i_mutex);
799 __ceph_do_pending_vmtruncate(inode);
800 if (origin != SEEK_CUR || origin != SEEK_SET) {
801 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
802 if (ret < 0) {
803 offset = ret;
804 goto out;
805 }
806 }
807
808 switch (origin) {
809 case SEEK_END:
810 offset += inode->i_size;
811 break;
812 case SEEK_CUR:
813 /*
814 * Here we special-case the lseek(fd, 0, SEEK_CUR)
815 * position-querying operation. Avoid rewriting the "same"
816 * f_pos value back to the file because a concurrent read(),
817 * write() or lseek() might have altered it
818 */
819 if (offset == 0) {
820 offset = file->f_pos;
821 goto out;
822 }
823 offset += file->f_pos;
824 break;
825 case SEEK_DATA:
826 if (offset >= inode->i_size) {
827 ret = -ENXIO;
828 goto out;
829 }
830 break;
831 case SEEK_HOLE:
832 if (offset >= inode->i_size) {
833 ret = -ENXIO;
834 goto out;
835 }
836 offset = inode->i_size;
837 break;
838 }
839
840 if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
841 offset = -EINVAL;
842 goto out;
843 }
844
845 /* Special lock needed here? */
846 if (offset != file->f_pos) {
847 file->f_pos = offset;
848 file->f_version = 0;
849 }
850
851out:
852 mutex_unlock(&inode->i_mutex);
853 return offset;
854}
855
856const struct file_operations ceph_file_fops = {
857 .open = ceph_open,
858 .release = ceph_release,
859 .llseek = ceph_llseek,
860 .read = do_sync_read,
861 .write = do_sync_write,
862 .aio_read = ceph_aio_read,
863 .aio_write = ceph_aio_write,
864 .mmap = ceph_mmap,
865 .fsync = ceph_fsync,
866 .lock = ceph_lock,
867 .flock = ceph_flock,
868 .splice_read = generic_file_splice_read,
869 .splice_write = generic_file_splice_write,
870 .unlocked_ioctl = ceph_ioctl,
871 .compat_ioctl = ceph_ioctl,
872};
873