1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/ceph/striper.h>
5 #include <linux/module.h>
6 #include <linux/sched.h>
7 #include <linux/slab.h>
8 #include <linux/file.h>
9 #include <linux/mount.h>
10 #include <linux/namei.h>
11 #include <linux/writeback.h>
12 #include <linux/falloc.h>
13 #include <linux/iversion.h>
16 #include "mds_client.h"
20 static __le32 ceph_flags_sys2wire(u32 flags)
24 switch (flags & O_ACCMODE) {
26 wire_flags |= CEPH_O_RDONLY;
29 wire_flags |= CEPH_O_WRONLY;
32 wire_flags |= CEPH_O_RDWR;
38 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
40 ceph_sys2wire(O_CREAT);
41 ceph_sys2wire(O_EXCL);
42 ceph_sys2wire(O_TRUNC);
43 ceph_sys2wire(O_DIRECTORY);
44 ceph_sys2wire(O_NOFOLLOW);
49 dout("unused open flags: %x\n", flags);
51 return cpu_to_le32(wire_flags);
55 * Ceph file operations
57 * Implement basic open/close functionality, and implement
60 * We implement three modes of file I/O:
61 * - buffered uses the generic_file_aio_{read,write} helpers
63 * - synchronous is used when there is multi-client read/write
64 * sharing, avoids the page cache, and synchronously waits for an
67 * - direct io takes the variant of the sync path that references
68 * user pages directly.
70 * fsync() flushes and waits on dirty pages, but just queues metadata
71 * for writeback: since the MDS can recover size and mtime there is no
72 * need to wait for MDS acknowledgement.
76 * How many pages to get in one call to iov_iter_get_pages(). This
77 * determines the size of the on-stack array used as a buffer.
79 #define ITER_GET_BVECS_PAGES 64
81 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
82 struct bio_vec *bvecs)
87 if (maxsize > iov_iter_count(iter))
88 maxsize = iov_iter_count(iter);
90 while (size < maxsize) {
91 struct page *pages[ITER_GET_BVECS_PAGES];
96 bytes = iov_iter_get_pages(iter, pages, maxsize - size,
97 ITER_GET_BVECS_PAGES, &start);
101 iov_iter_advance(iter, bytes);
104 for ( ; bytes; idx++, bvec_idx++) {
105 struct bio_vec bv = {
106 .bv_page = pages[idx],
107 .bv_len = min_t(int, bytes, PAGE_SIZE - start),
111 bvecs[bvec_idx] = bv;
121 * iov_iter_get_pages() only considers one iov_iter segment, no matter
122 * what maxsize or maxpages are given. For ITER_BVEC that is a single
125 * Attempt to get up to @maxsize bytes worth of pages from @iter.
126 * Return the number of bytes in the created bio_vec array, or an error.
128 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
129 struct bio_vec **bvecs, int *num_bvecs)
132 size_t orig_count = iov_iter_count(iter);
136 iov_iter_truncate(iter, maxsize);
137 npages = iov_iter_npages(iter, INT_MAX);
138 iov_iter_reexpand(iter, orig_count);
141 * __iter_get_bvecs() may populate only part of the array -- zero it
144 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
148 bytes = __iter_get_bvecs(iter, maxsize, bv);
151 * No pages were pinned -- just free the array.
162 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
166 for (i = 0; i < num_bvecs; i++) {
167 if (bvecs[i].bv_page) {
169 set_page_dirty_lock(bvecs[i].bv_page);
170 put_page(bvecs[i].bv_page);
177 * Prepare an open request. Preallocate ceph_cap to avoid an
178 * inopportune ENOMEM later.
180 static struct ceph_mds_request *
181 prepare_open_request(struct super_block *sb, int flags, int create_mode)
183 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
184 struct ceph_mds_client *mdsc = fsc->mdsc;
185 struct ceph_mds_request *req;
186 int want_auth = USE_ANY_MDS;
187 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
189 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
190 want_auth = USE_AUTH_MDS;
192 req = ceph_mdsc_create_request(mdsc, op, want_auth);
195 req->r_fmode = ceph_flags_to_mode(flags);
196 req->r_args.open.flags = ceph_flags_sys2wire(flags);
197 req->r_args.open.mode = cpu_to_le32(create_mode);
202 static int ceph_init_file_info(struct inode *inode, struct file *file,
203 int fmode, bool isdir)
205 struct ceph_inode_info *ci = ceph_inode(inode);
206 struct ceph_file_info *fi;
208 dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
209 inode->i_mode, isdir ? "dir" : "regular");
210 BUG_ON(inode->i_fop->release != ceph_release);
213 struct ceph_dir_file_info *dfi =
214 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
216 ceph_put_fmode(ci, fmode); /* clean up */
220 file->private_data = dfi;
221 fi = &dfi->file_info;
222 dfi->next_offset = 2;
223 dfi->readdir_cache_idx = -1;
225 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
227 ceph_put_fmode(ci, fmode); /* clean up */
231 file->private_data = fi;
235 spin_lock_init(&fi->rw_contexts_lock);
236 INIT_LIST_HEAD(&fi->rw_contexts);
237 fi->meta_err = errseq_sample(&ci->i_meta_err);
238 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
244 * initialize private struct file data.
245 * if we fail, clean up by dropping fmode reference on the ceph_inode
247 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
251 switch (inode->i_mode & S_IFMT) {
253 ceph_fscache_register_inode_cookie(inode);
254 ceph_fscache_file_set_cookie(inode, file);
257 ret = ceph_init_file_info(inode, file, fmode,
258 S_ISDIR(inode->i_mode));
264 dout("init_file %p %p 0%o (symlink)\n", inode, file,
266 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
270 dout("init_file %p %p 0%o (special)\n", inode, file,
273 * we need to drop the open ref now, since we don't
274 * have .release set to ceph_release.
276 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
277 BUG_ON(inode->i_fop->release == ceph_release);
279 /* call the proper open fop */
280 ret = inode->i_fop->open(inode, file);
286 * try renew caps after session gets killed.
288 int ceph_renew_caps(struct inode *inode)
290 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
291 struct ceph_inode_info *ci = ceph_inode(inode);
292 struct ceph_mds_request *req;
293 int err, flags, wanted;
295 spin_lock(&ci->i_ceph_lock);
296 wanted = __ceph_caps_file_wanted(ci);
297 if (__ceph_is_any_real_caps(ci) &&
298 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
299 int issued = __ceph_caps_issued(ci, NULL);
300 spin_unlock(&ci->i_ceph_lock);
301 dout("renew caps %p want %s issued %s updating mds_wanted\n",
302 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
303 ceph_check_caps(ci, 0, NULL);
306 spin_unlock(&ci->i_ceph_lock);
309 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
311 else if (wanted & CEPH_CAP_FILE_RD)
313 else if (wanted & CEPH_CAP_FILE_WR)
316 if (wanted & CEPH_CAP_FILE_LAZYIO)
320 req = prepare_open_request(inode->i_sb, flags, 0);
326 req->r_inode = inode;
331 err = ceph_mdsc_do_request(mdsc, NULL, req);
332 ceph_mdsc_put_request(req);
334 dout("renew caps %p open result=%d\n", inode, err);
335 return err < 0 ? err : 0;
339 * If we already have the requisite capabilities, we can satisfy
340 * the open request locally (no need to request new caps from the
341 * MDS). We do, however, need to inform the MDS (asynchronously)
342 * if our wanted caps set expands.
344 int ceph_open(struct inode *inode, struct file *file)
346 struct ceph_inode_info *ci = ceph_inode(inode);
347 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
348 struct ceph_mds_client *mdsc = fsc->mdsc;
349 struct ceph_mds_request *req;
350 struct ceph_file_info *fi = file->private_data;
352 int flags, fmode, wanted;
355 dout("open file %p is already opened\n", file);
359 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
360 flags = file->f_flags & ~(O_CREAT|O_EXCL);
361 if (S_ISDIR(inode->i_mode))
362 flags = O_DIRECTORY; /* mds likes to know */
364 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
365 ceph_vinop(inode), file, flags, file->f_flags);
366 fmode = ceph_flags_to_mode(flags);
367 wanted = ceph_caps_for_mode(fmode);
369 /* snapped files are read-only */
370 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
373 /* trivially open snapdir */
374 if (ceph_snap(inode) == CEPH_SNAPDIR) {
375 spin_lock(&ci->i_ceph_lock);
376 __ceph_get_fmode(ci, fmode);
377 spin_unlock(&ci->i_ceph_lock);
378 return ceph_init_file(inode, file, fmode);
382 * No need to block if we have caps on the auth MDS (for
383 * write) or any MDS (for read). Update wanted set
386 spin_lock(&ci->i_ceph_lock);
387 if (__ceph_is_any_real_caps(ci) &&
388 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
389 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
390 int issued = __ceph_caps_issued(ci, NULL);
392 dout("open %p fmode %d want %s issued %s using existing\n",
393 inode, fmode, ceph_cap_string(wanted),
394 ceph_cap_string(issued));
395 __ceph_get_fmode(ci, fmode);
396 spin_unlock(&ci->i_ceph_lock);
399 if ((issued & wanted) != wanted &&
400 (mds_wanted & wanted) != wanted &&
401 ceph_snap(inode) != CEPH_SNAPDIR)
402 ceph_check_caps(ci, 0, NULL);
404 return ceph_init_file(inode, file, fmode);
405 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
406 (ci->i_snap_caps & wanted) == wanted) {
407 __ceph_get_fmode(ci, fmode);
408 spin_unlock(&ci->i_ceph_lock);
409 return ceph_init_file(inode, file, fmode);
412 spin_unlock(&ci->i_ceph_lock);
414 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
415 req = prepare_open_request(inode->i_sb, flags, 0);
420 req->r_inode = inode;
424 err = ceph_mdsc_do_request(mdsc, NULL, req);
426 err = ceph_init_file(inode, file, req->r_fmode);
427 ceph_mdsc_put_request(req);
428 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
435 * Do a lookup + open with a single request. If we get a non-existent
436 * file or symlink, return 1 so the VFS can retry.
438 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
439 struct file *file, unsigned flags, umode_t mode)
441 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
442 struct ceph_mds_client *mdsc = fsc->mdsc;
443 struct ceph_mds_request *req;
445 struct ceph_acl_sec_ctx as_ctx = {};
449 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
451 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
453 if (dentry->d_name.len > NAME_MAX)
454 return -ENAMETOOLONG;
456 if (flags & O_CREAT) {
457 if (ceph_quota_is_max_files_exceeded(dir))
459 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
462 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
465 } else if (!d_in_lookup(dentry)) {
466 /* If it's not being looked up, it's negative */
471 req = prepare_open_request(dir->i_sb, flags, mode);
476 req->r_dentry = dget(dentry);
478 if (flags & O_CREAT) {
479 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
480 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
481 if (as_ctx.pagelist) {
482 req->r_pagelist = as_ctx.pagelist;
483 as_ctx.pagelist = NULL;
487 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
488 if (ceph_security_xattr_wanted(dir))
489 mask |= CEPH_CAP_XATTR_SHARED;
490 req->r_args.open.mask = cpu_to_le32(mask);
493 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
494 err = ceph_mdsc_do_request(mdsc,
495 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
497 err = ceph_handle_snapdir(req, dentry, err);
501 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
502 err = ceph_handle_notrace_create(dir, dentry);
504 if (d_in_lookup(dentry)) {
505 dn = ceph_finish_lookup(req, dentry, err);
509 /* we were given a hashed negative dentry */
514 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
515 /* make vfs retry on splice, ENOENT, or symlink */
516 dout("atomic_open finish_no_open on dn %p\n", dn);
517 err = finish_no_open(file, dn);
519 dout("atomic_open finish_open on dn %p\n", dn);
520 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
521 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
522 file->f_mode |= FMODE_CREATED;
524 err = finish_open(file, dentry, ceph_open);
527 if (!req->r_err && req->r_target_inode)
528 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
529 ceph_mdsc_put_request(req);
531 ceph_release_acl_sec_ctx(&as_ctx);
532 dout("atomic_open result=%d\n", err);
536 int ceph_release(struct inode *inode, struct file *file)
538 struct ceph_inode_info *ci = ceph_inode(inode);
540 if (S_ISDIR(inode->i_mode)) {
541 struct ceph_dir_file_info *dfi = file->private_data;
542 dout("release inode %p dir file %p\n", inode, file);
543 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
545 ceph_put_fmode(ci, dfi->file_info.fmode);
547 if (dfi->last_readdir)
548 ceph_mdsc_put_request(dfi->last_readdir);
549 kfree(dfi->last_name);
550 kfree(dfi->dir_info);
551 kmem_cache_free(ceph_dir_file_cachep, dfi);
553 struct ceph_file_info *fi = file->private_data;
554 dout("release inode %p regular file %p\n", inode, file);
555 WARN_ON(!list_empty(&fi->rw_contexts));
557 ceph_put_fmode(ci, fi->fmode);
558 kmem_cache_free(ceph_file_cachep, fi);
561 /* wake up anyone waiting for caps on this inode */
562 wake_up_all(&ci->i_cap_wq);
573 * Completely synchronous read and write methods. Direct from __user
574 * buffer to osd, or directly to user pages (if O_DIRECT).
576 * If the read spans object boundary, just do multiple reads. (That's not
577 * atomic, but good enough for now.)
579 * If we get a short result from the OSD, check against i_size; we need to
580 * only return a short read to the caller if we hit EOF.
582 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
585 struct file *file = iocb->ki_filp;
586 struct inode *inode = file_inode(file);
587 struct ceph_inode_info *ci = ceph_inode(inode);
588 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
589 struct ceph_osd_client *osdc = &fsc->client->osdc;
591 u64 off = iocb->ki_pos;
592 u64 len = iov_iter_count(to);
594 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
595 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
600 * flush any page cache pages in this range. this
601 * will make concurrent normal and sync io slow,
602 * but it will at least behave sensibly when they are
605 ret = filemap_write_and_wait_range(inode->i_mapping,
611 while ((len = iov_iter_count(to)) > 0) {
612 struct ceph_osd_request *req;
619 req = ceph_osdc_new_request(osdc, &ci->i_layout,
620 ci->i_vino, off, &len, 0, 1,
621 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
622 NULL, ci->i_truncate_seq,
623 ci->i_truncate_size, false);
629 more = len < iov_iter_count(to);
631 if (unlikely(iov_iter_is_pipe(to))) {
632 ret = iov_iter_get_pages_alloc(to, &pages, len,
635 ceph_osdc_put_request(req);
639 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
642 osd_req_op_extent_update(req, 0, len);
646 num_pages = calc_pages_for(off, len);
647 page_off = off & ~PAGE_MASK;
648 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
650 ceph_osdc_put_request(req);
651 ret = PTR_ERR(pages);
656 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
658 ret = ceph_osdc_start_request(osdc, req, false);
660 ret = ceph_osdc_wait_request(osdc, req);
661 ceph_osdc_put_request(req);
663 i_size = i_size_read(inode);
664 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
665 off, len, ret, i_size, (more ? " MORE" : ""));
669 if (ret >= 0 && ret < len && (off + ret < i_size)) {
670 int zlen = min(len - ret, i_size - off - ret);
671 int zoff = page_off + ret;
672 dout("sync_read zero gap %llu~%llu\n",
673 off + ret, off + ret + zlen);
674 ceph_zero_page_vector_range(zoff, zlen, pages);
678 if (unlikely(iov_iter_is_pipe(to))) {
680 iov_iter_advance(to, ret);
683 iov_iter_advance(to, 0);
685 ceph_put_page_vector(pages, num_pages, false);
688 size_t left = ret > 0 ? ret : 0;
691 page_off = off & ~PAGE_MASK;
692 len = min_t(size_t, left, PAGE_SIZE - page_off);
693 copied = copy_page_to_iter(pages[idx++],
702 ceph_release_page_vector(pages, num_pages);
706 if (ret == -EBLACKLISTED)
707 fsc->blacklisted = true;
711 if (off >= i_size || !more)
715 if (off > iocb->ki_pos) {
717 iov_iter_count(to) > 0 && off >= i_size_read(inode))
718 *retry_op = CHECK_EOF;
719 ret = off - iocb->ki_pos;
723 dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
727 struct ceph_aio_request {
733 struct list_head osd_reqs;
735 atomic_t pending_reqs;
736 struct timespec64 mtime;
737 struct ceph_cap_flush *prealloc_cf;
740 struct ceph_aio_work {
741 struct work_struct work;
742 struct ceph_osd_request *req;
745 static void ceph_aio_retry_work(struct work_struct *work);
747 static void ceph_aio_complete(struct inode *inode,
748 struct ceph_aio_request *aio_req)
750 struct ceph_inode_info *ci = ceph_inode(inode);
753 if (!atomic_dec_and_test(&aio_req->pending_reqs))
756 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
757 inode_dio_end(inode);
759 ret = aio_req->error;
761 ret = aio_req->total_len;
763 dout("ceph_aio_complete %p rc %d\n", inode, ret);
765 if (ret >= 0 && aio_req->write) {
768 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
769 if (endoff > i_size_read(inode)) {
770 if (ceph_inode_set_size(inode, endoff))
771 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
774 spin_lock(&ci->i_ceph_lock);
775 ci->i_inline_version = CEPH_INLINE_NONE;
776 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
777 &aio_req->prealloc_cf);
778 spin_unlock(&ci->i_ceph_lock);
780 __mark_inode_dirty(inode, dirty);
784 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
787 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
789 ceph_free_cap_flush(aio_req->prealloc_cf);
793 static void ceph_aio_complete_req(struct ceph_osd_request *req)
795 int rc = req->r_result;
796 struct inode *inode = req->r_inode;
797 struct ceph_aio_request *aio_req = req->r_priv;
798 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
800 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
801 BUG_ON(!osd_data->num_bvecs);
803 dout("ceph_aio_complete_req %p rc %d bytes %u\n",
804 inode, rc, osd_data->bvec_pos.iter.bi_size);
806 if (rc == -EOLDSNAPC) {
807 struct ceph_aio_work *aio_work;
808 BUG_ON(!aio_req->write);
810 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
812 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
814 queue_work(ceph_inode_to_client(inode)->inode_wq,
819 } else if (!aio_req->write) {
822 if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) {
824 int zlen = osd_data->bvec_pos.iter.bi_size - rc;
827 * If read is satisfied by single OSD request,
828 * it can pass EOF. Otherwise read is within
831 if (aio_req->num_reqs == 1) {
832 loff_t i_size = i_size_read(inode);
833 loff_t endoff = aio_req->iocb->ki_pos + rc;
835 zlen = min_t(size_t, zlen,
837 aio_req->total_len = rc + zlen;
840 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
842 osd_data->bvec_pos.iter.bi_size);
843 iov_iter_advance(&i, rc);
844 iov_iter_zero(zlen, &i);
848 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
849 aio_req->should_dirty);
850 ceph_osdc_put_request(req);
853 cmpxchg(&aio_req->error, 0, rc);
855 ceph_aio_complete(inode, aio_req);
859 static void ceph_aio_retry_work(struct work_struct *work)
861 struct ceph_aio_work *aio_work =
862 container_of(work, struct ceph_aio_work, work);
863 struct ceph_osd_request *orig_req = aio_work->req;
864 struct ceph_aio_request *aio_req = orig_req->r_priv;
865 struct inode *inode = orig_req->r_inode;
866 struct ceph_inode_info *ci = ceph_inode(inode);
867 struct ceph_snap_context *snapc;
868 struct ceph_osd_request *req;
871 spin_lock(&ci->i_ceph_lock);
872 if (__ceph_have_pending_cap_snap(ci)) {
873 struct ceph_cap_snap *capsnap =
874 list_last_entry(&ci->i_cap_snaps,
875 struct ceph_cap_snap,
877 snapc = ceph_get_snap_context(capsnap->context);
879 BUG_ON(!ci->i_head_snapc);
880 snapc = ceph_get_snap_context(ci->i_head_snapc);
882 spin_unlock(&ci->i_ceph_lock);
884 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
892 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
893 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
894 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
896 req->r_ops[0] = orig_req->r_ops[0];
898 req->r_mtime = aio_req->mtime;
899 req->r_data_offset = req->r_ops[0].extent.offset;
901 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
903 ceph_osdc_put_request(req);
908 ceph_osdc_put_request(orig_req);
910 req->r_callback = ceph_aio_complete_req;
911 req->r_inode = inode;
912 req->r_priv = aio_req;
914 ret = ceph_osdc_start_request(req->r_osdc, req, false);
918 ceph_aio_complete_req(req);
921 ceph_put_snap_context(snapc);
926 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
927 struct ceph_snap_context *snapc,
928 struct ceph_cap_flush **pcf)
930 struct file *file = iocb->ki_filp;
931 struct inode *inode = file_inode(file);
932 struct ceph_inode_info *ci = ceph_inode(inode);
933 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
934 struct ceph_vino vino;
935 struct ceph_osd_request *req;
936 struct bio_vec *bvecs;
937 struct ceph_aio_request *aio_req = NULL;
941 struct timespec64 mtime = current_time(inode);
942 size_t count = iov_iter_count(iter);
943 loff_t pos = iocb->ki_pos;
944 bool write = iov_iter_rw(iter) == WRITE;
945 bool should_dirty = !write && iter_is_iovec(iter);
947 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
950 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
951 (write ? "write" : "read"), file, pos, (unsigned)count,
952 snapc, snapc ? snapc->seq : 0);
955 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
957 (pos + count - 1) >> PAGE_SHIFT);
959 dout("invalidate_inode_pages2_range returned %d\n", ret2);
961 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
963 flags = CEPH_OSD_FLAG_READ;
966 while (iov_iter_count(iter) > 0) {
967 u64 size = iov_iter_count(iter);
971 size = min_t(u64, size, fsc->mount_options->wsize);
973 size = min_t(u64, size, fsc->mount_options->rsize);
975 vino = ceph_vino(inode);
976 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
979 write ? CEPH_OSD_OP_WRITE :
990 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
992 ceph_osdc_put_request(req);
997 osd_req_op_extent_update(req, 0, len);
1000 * To simplify error handling, allow AIO when IO within i_size
1001 * or IO can be satisfied by single OSD request.
1003 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1004 (len == count || pos + count <= i_size_read(inode))) {
1005 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1007 aio_req->iocb = iocb;
1008 aio_req->write = write;
1009 aio_req->should_dirty = should_dirty;
1010 INIT_LIST_HEAD(&aio_req->osd_reqs);
1012 aio_req->mtime = mtime;
1013 swap(aio_req->prealloc_cf, *pcf);
1021 * throw out any page cache pages in this range. this
1024 truncate_inode_pages_range(inode->i_mapping, pos,
1025 PAGE_ALIGN(pos + len) - 1);
1027 req->r_mtime = mtime;
1030 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1033 aio_req->total_len += len;
1034 aio_req->num_reqs++;
1035 atomic_inc(&aio_req->pending_reqs);
1037 req->r_callback = ceph_aio_complete_req;
1038 req->r_inode = inode;
1039 req->r_priv = aio_req;
1040 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1046 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1048 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1050 size = i_size_read(inode);
1054 if (ret >= 0 && ret < len && pos + ret < size) {
1056 int zlen = min_t(size_t, len - ret,
1059 iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1060 iov_iter_advance(&i, ret);
1061 iov_iter_zero(zlen, &i);
1068 put_bvecs(bvecs, num_pages, should_dirty);
1069 ceph_osdc_put_request(req);
1074 if (!write && pos >= size)
1077 if (write && pos > size) {
1078 if (ceph_inode_set_size(inode, pos))
1079 ceph_check_caps(ceph_inode(inode),
1080 CHECK_CAPS_AUTHONLY,
1086 LIST_HEAD(osd_reqs);
1088 if (aio_req->num_reqs == 0) {
1093 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1096 list_splice(&aio_req->osd_reqs, &osd_reqs);
1097 inode_dio_begin(inode);
1098 while (!list_empty(&osd_reqs)) {
1099 req = list_first_entry(&osd_reqs,
1100 struct ceph_osd_request,
1102 list_del_init(&req->r_private_item);
1104 ret = ceph_osdc_start_request(req->r_osdc,
1107 req->r_result = ret;
1108 ceph_aio_complete_req(req);
1111 return -EIOCBQUEUED;
1114 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1115 ret = pos - iocb->ki_pos;
1122 * Synchronous write, straight from __user pointer or user pages.
1124 * If write spans object boundary, just do multiple writes. (For a
1125 * correct atomic write, we should e.g. take write locks on all
1126 * objects, rollback on failure, etc.)
1129 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1130 struct ceph_snap_context *snapc)
1132 struct file *file = iocb->ki_filp;
1133 struct inode *inode = file_inode(file);
1134 struct ceph_inode_info *ci = ceph_inode(inode);
1135 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1136 struct ceph_vino vino;
1137 struct ceph_osd_request *req;
1138 struct page **pages;
1144 bool check_caps = false;
1145 struct timespec64 mtime = current_time(inode);
1146 size_t count = iov_iter_count(from);
1148 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1151 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1152 file, pos, (unsigned)count, snapc, snapc->seq);
1154 ret = filemap_write_and_wait_range(inode->i_mapping,
1155 pos, pos + count - 1);
1159 ret = invalidate_inode_pages2_range(inode->i_mapping,
1161 (pos + count - 1) >> PAGE_SHIFT);
1163 dout("invalidate_inode_pages2_range returned %d\n", ret);
1165 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1167 while ((len = iov_iter_count(from)) > 0) {
1171 vino = ceph_vino(inode);
1172 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1173 vino, pos, &len, 0, 1,
1174 CEPH_OSD_OP_WRITE, flags, snapc,
1176 ci->i_truncate_size,
1184 * write from beginning of first page,
1185 * regardless of io alignment
1187 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1189 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1190 if (IS_ERR(pages)) {
1191 ret = PTR_ERR(pages);
1196 for (n = 0; n < num_pages; n++) {
1197 size_t plen = min_t(size_t, left, PAGE_SIZE);
1198 ret = copy_page_from_iter(pages[n], 0, plen, from);
1207 ceph_release_page_vector(pages, num_pages);
1211 req->r_inode = inode;
1213 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1216 req->r_mtime = mtime;
1217 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1219 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1222 ceph_osdc_put_request(req);
1224 ceph_set_error_write(ci);
1228 ceph_clear_error_write(ci);
1231 if (pos > i_size_read(inode)) {
1232 check_caps = ceph_inode_set_size(inode, pos);
1234 ceph_check_caps(ceph_inode(inode),
1235 CHECK_CAPS_AUTHONLY,
1241 if (ret != -EOLDSNAPC && written > 0) {
1249 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1250 * Atomically grab references, so that those bits are not released
1251 * back to the MDS mid-read.
1253 * Hmm, the sync read case isn't actually async... should it be?
1255 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1257 struct file *filp = iocb->ki_filp;
1258 struct ceph_file_info *fi = filp->private_data;
1259 size_t len = iov_iter_count(to);
1260 struct inode *inode = file_inode(filp);
1261 struct ceph_inode_info *ci = ceph_inode(inode);
1262 struct page *pinned_page = NULL;
1265 int retry_op = 0, read = 0;
1268 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1269 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1271 if (iocb->ki_flags & IOCB_DIRECT)
1272 ceph_start_io_direct(inode);
1274 ceph_start_io_read(inode);
1276 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1277 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1279 want = CEPH_CAP_FILE_CACHE;
1280 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1,
1281 &got, &pinned_page);
1283 if (iocb->ki_flags & IOCB_DIRECT)
1284 ceph_end_io_direct(inode);
1286 ceph_end_io_read(inode);
1290 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1291 (iocb->ki_flags & IOCB_DIRECT) ||
1292 (fi->flags & CEPH_F_SYNC)) {
1294 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1295 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1296 ceph_cap_string(got));
1298 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1299 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1300 ret = ceph_direct_read_write(iocb, to,
1302 if (ret >= 0 && ret < len)
1303 retry_op = CHECK_EOF;
1305 ret = ceph_sync_read(iocb, to, &retry_op);
1308 retry_op = READ_INLINE;
1311 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1312 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1313 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1314 ceph_cap_string(got));
1315 ceph_add_rw_context(fi, &rw_ctx);
1316 ret = generic_file_read_iter(iocb, to);
1317 ceph_del_rw_context(fi, &rw_ctx);
1320 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1321 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1323 put_page(pinned_page);
1326 ceph_put_cap_refs(ci, got);
1328 if (iocb->ki_flags & IOCB_DIRECT)
1329 ceph_end_io_direct(inode);
1331 ceph_end_io_read(inode);
1333 if (retry_op > HAVE_RETRIED && ret >= 0) {
1335 struct page *page = NULL;
1337 if (retry_op == READ_INLINE) {
1338 page = __page_cache_alloc(GFP_KERNEL);
1343 statret = __ceph_do_getattr(inode, page,
1344 CEPH_STAT_CAP_INLINE_DATA, !!page);
1348 if (statret == -ENODATA) {
1349 BUG_ON(retry_op != READ_INLINE);
1355 i_size = i_size_read(inode);
1356 if (retry_op == READ_INLINE) {
1357 BUG_ON(ret > 0 || read > 0);
1358 if (iocb->ki_pos < i_size &&
1359 iocb->ki_pos < PAGE_SIZE) {
1360 loff_t end = min_t(loff_t, i_size,
1361 iocb->ki_pos + len);
1362 end = min_t(loff_t, end, PAGE_SIZE);
1364 zero_user_segment(page, statret, end);
1365 ret = copy_page_to_iter(page,
1366 iocb->ki_pos & ~PAGE_MASK,
1367 end - iocb->ki_pos, to);
1368 iocb->ki_pos += ret;
1371 if (iocb->ki_pos < i_size && read < len) {
1372 size_t zlen = min_t(size_t, len - read,
1373 i_size - iocb->ki_pos);
1374 ret = iov_iter_zero(zlen, to);
1375 iocb->ki_pos += ret;
1378 __free_pages(page, 0);
1382 /* hit EOF or hole? */
1383 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1385 dout("sync_read hit hole, ppos %lld < size %lld"
1386 ", reading more\n", iocb->ki_pos, i_size);
1390 retry_op = HAVE_RETRIED;
1402 * Take cap references to avoid releasing caps to MDS mid-write.
1404 * If we are synchronous, and write with an old snap context, the OSD
1405 * may return EOLDSNAPC. In that case, retry the write.. _after_
1406 * dropping our cap refs and allowing the pending snap to logically
1407 * complete _before_ this write occurs.
1409 * If we are near ENOSPC, write synchronously.
1411 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1413 struct file *file = iocb->ki_filp;
1414 struct ceph_file_info *fi = file->private_data;
1415 struct inode *inode = file_inode(file);
1416 struct ceph_inode_info *ci = ceph_inode(inode);
1417 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1418 struct ceph_cap_flush *prealloc_cf;
1419 ssize_t count, written = 0;
1422 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1424 if (ceph_snap(inode) != CEPH_NOSNAP)
1427 prealloc_cf = ceph_alloc_cap_flush();
1432 if (iocb->ki_flags & IOCB_DIRECT)
1433 ceph_start_io_direct(inode);
1435 ceph_start_io_write(inode);
1437 /* We can write back this queue in page reclaim */
1438 current->backing_dev_info = inode_to_bdi(inode);
1440 if (iocb->ki_flags & IOCB_APPEND) {
1441 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1446 err = generic_write_checks(iocb, from);
1451 if (unlikely(pos >= limit)) {
1455 iov_iter_truncate(from, limit - pos);
1458 count = iov_iter_count(from);
1459 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1464 err = file_remove_privs(file);
1468 err = file_update_time(file);
1472 inode_inc_iversion_raw(inode);
1474 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1475 err = ceph_uninline_data(file, NULL);
1480 /* FIXME: not complete since it doesn't account for being at quota */
1481 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_FULL)) {
1486 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1487 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1488 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1489 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1491 want = CEPH_CAP_FILE_BUFFER;
1493 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count,
1498 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1499 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1501 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1502 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1503 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1504 struct ceph_snap_context *snapc;
1505 struct iov_iter data;
1507 spin_lock(&ci->i_ceph_lock);
1508 if (__ceph_have_pending_cap_snap(ci)) {
1509 struct ceph_cap_snap *capsnap =
1510 list_last_entry(&ci->i_cap_snaps,
1511 struct ceph_cap_snap,
1513 snapc = ceph_get_snap_context(capsnap->context);
1515 BUG_ON(!ci->i_head_snapc);
1516 snapc = ceph_get_snap_context(ci->i_head_snapc);
1518 spin_unlock(&ci->i_ceph_lock);
1520 /* we might need to revert back to that point */
1522 if (iocb->ki_flags & IOCB_DIRECT) {
1523 written = ceph_direct_read_write(iocb, &data, snapc,
1525 ceph_end_io_direct(inode);
1527 written = ceph_sync_write(iocb, &data, pos, snapc);
1528 ceph_end_io_write(inode);
1531 iov_iter_advance(from, written);
1532 ceph_put_snap_context(snapc);
1535 * No need to acquire the i_truncate_mutex. Because
1536 * the MDS revokes Fwb caps before sending truncate
1537 * message to us. We can't get Fwb cap while there
1538 * are pending vmtruncate. So write and vmtruncate
1539 * can not run at the same time
1541 written = generic_perform_write(file, from, pos);
1542 if (likely(written >= 0))
1543 iocb->ki_pos = pos + written;
1544 ceph_end_io_write(inode);
1550 spin_lock(&ci->i_ceph_lock);
1551 ci->i_inline_version = CEPH_INLINE_NONE;
1552 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1554 spin_unlock(&ci->i_ceph_lock);
1556 __mark_inode_dirty(inode, dirty);
1557 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1558 ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL);
1561 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1562 inode, ceph_vinop(inode), pos, (unsigned)count,
1563 ceph_cap_string(got));
1564 ceph_put_cap_refs(ci, got);
1566 if (written == -EOLDSNAPC) {
1567 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1568 inode, ceph_vinop(inode), pos, (unsigned)count);
1573 if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_NEARFULL))
1574 iocb->ki_flags |= IOCB_DSYNC;
1575 written = generic_write_sync(iocb, written);
1580 if (iocb->ki_flags & IOCB_DIRECT)
1581 ceph_end_io_direct(inode);
1583 ceph_end_io_write(inode);
1585 ceph_free_cap_flush(prealloc_cf);
1586 current->backing_dev_info = NULL;
1587 return written ? written : err;
1591 * llseek. be sure to verify file size on SEEK_END.
1593 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1595 struct inode *inode = file->f_mapping->host;
1596 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1602 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1603 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1608 i_size = i_size_read(inode);
1615 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1616 * position-querying operation. Avoid rewriting the "same"
1617 * f_pos value back to the file because a concurrent read(),
1618 * write() or lseek() might have altered it
1624 offset += file->f_pos;
1627 if (offset < 0 || offset >= i_size) {
1633 if (offset < 0 || offset >= i_size) {
1641 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1644 inode_unlock(inode);
1648 static inline void ceph_zero_partial_page(
1649 struct inode *inode, loff_t offset, unsigned size)
1652 pgoff_t index = offset >> PAGE_SHIFT;
1654 page = find_lock_page(inode->i_mapping, index);
1656 wait_on_page_writeback(page);
1657 zero_user(page, offset & (PAGE_SIZE - 1), size);
1663 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1666 loff_t nearly = round_up(offset, PAGE_SIZE);
1667 if (offset < nearly) {
1668 loff_t size = nearly - offset;
1671 ceph_zero_partial_page(inode, offset, size);
1675 if (length >= PAGE_SIZE) {
1676 loff_t size = round_down(length, PAGE_SIZE);
1677 truncate_pagecache_range(inode, offset, offset + size - 1);
1682 ceph_zero_partial_page(inode, offset, length);
1685 static int ceph_zero_partial_object(struct inode *inode,
1686 loff_t offset, loff_t *length)
1688 struct ceph_inode_info *ci = ceph_inode(inode);
1689 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1690 struct ceph_osd_request *req;
1696 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1699 op = CEPH_OSD_OP_ZERO;
1702 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1706 CEPH_OSD_FLAG_WRITE,
1713 req->r_mtime = inode->i_mtime;
1714 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1716 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1720 ceph_osdc_put_request(req);
1726 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1729 struct ceph_inode_info *ci = ceph_inode(inode);
1730 s32 stripe_unit = ci->i_layout.stripe_unit;
1731 s32 stripe_count = ci->i_layout.stripe_count;
1732 s32 object_size = ci->i_layout.object_size;
1733 u64 object_set_size = object_size * stripe_count;
1736 /* round offset up to next period boundary */
1737 nearly = offset + object_set_size - 1;
1739 nearly -= do_div(t, object_set_size);
1741 while (length && offset < nearly) {
1742 loff_t size = length;
1743 ret = ceph_zero_partial_object(inode, offset, &size);
1749 while (length >= object_set_size) {
1751 loff_t pos = offset;
1752 for (i = 0; i < stripe_count; ++i) {
1753 ret = ceph_zero_partial_object(inode, pos, NULL);
1758 offset += object_set_size;
1759 length -= object_set_size;
1762 loff_t size = length;
1763 ret = ceph_zero_partial_object(inode, offset, &size);
1772 static long ceph_fallocate(struct file *file, int mode,
1773 loff_t offset, loff_t length)
1775 struct ceph_file_info *fi = file->private_data;
1776 struct inode *inode = file_inode(file);
1777 struct ceph_inode_info *ci = ceph_inode(inode);
1778 struct ceph_cap_flush *prealloc_cf;
1785 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1788 if (!S_ISREG(inode->i_mode))
1791 prealloc_cf = ceph_alloc_cap_flush();
1797 if (ceph_snap(inode) != CEPH_NOSNAP) {
1802 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1803 ret = ceph_uninline_data(file, NULL);
1808 size = i_size_read(inode);
1810 /* Are we punching a hole beyond EOF? */
1813 if ((offset + length) > size)
1814 length = size - offset;
1816 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1817 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1819 want = CEPH_CAP_FILE_BUFFER;
1821 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1825 ceph_zero_pagecache_range(inode, offset, length);
1826 ret = ceph_zero_objects(inode, offset, length);
1829 spin_lock(&ci->i_ceph_lock);
1830 ci->i_inline_version = CEPH_INLINE_NONE;
1831 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1833 spin_unlock(&ci->i_ceph_lock);
1835 __mark_inode_dirty(inode, dirty);
1838 ceph_put_cap_refs(ci, got);
1840 inode_unlock(inode);
1841 ceph_free_cap_flush(prealloc_cf);
1846 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
1847 * src_ci. Two attempts are made to obtain both caps, and an error is return if
1848 * this fails; zero is returned on success.
1850 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
1851 struct file *dst_filp,
1852 loff_t dst_endoff, int *dst_got)
1855 bool retrying = false;
1858 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
1859 dst_endoff, dst_got, NULL);
1864 * Since we're already holding the FILE_WR capability for the dst file,
1865 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
1866 * retry dance instead to try to get both capabilities.
1868 ret = ceph_try_get_caps(file_inode(src_filp),
1869 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
1872 /* Start by dropping dst_ci caps and getting src_ci caps */
1873 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
1876 /* ceph_try_get_caps masks EAGAIN */
1880 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
1881 CEPH_CAP_FILE_SHARED, -1, src_got, NULL);
1884 /*... drop src_ci caps too, and retry */
1885 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
1892 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
1893 struct ceph_inode_info *dst_ci, int dst_got)
1895 ceph_put_cap_refs(src_ci, src_got);
1896 ceph_put_cap_refs(dst_ci, dst_got);
1900 * This function does several size-related checks, returning an error if:
1901 * - source file is smaller than off+len
1902 * - destination file size is not OK (inode_newsize_ok())
1903 * - max bytes quotas is exceeded
1905 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
1906 loff_t src_off, loff_t dst_off, size_t len)
1908 loff_t size, endoff;
1910 size = i_size_read(src_inode);
1912 * Don't copy beyond source file EOF. Instead of simply setting length
1913 * to (size - src_off), just drop to VFS default implementation, as the
1914 * local i_size may be stale due to other clients writing to the source
1917 if (src_off + len > size) {
1918 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
1919 src_off, len, size);
1922 size = i_size_read(dst_inode);
1924 endoff = dst_off + len;
1925 if (inode_newsize_ok(dst_inode, endoff))
1928 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
1934 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
1935 struct file *dst_file, loff_t dst_off,
1936 size_t len, unsigned int flags)
1938 struct inode *src_inode = file_inode(src_file);
1939 struct inode *dst_inode = file_inode(dst_file);
1940 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
1941 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
1942 struct ceph_cap_flush *prealloc_cf;
1943 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
1944 struct ceph_object_locator src_oloc, dst_oloc;
1945 struct ceph_object_id src_oid, dst_oid;
1946 loff_t endoff = 0, size;
1948 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
1949 u32 src_objlen, dst_objlen, object_size;
1950 int src_got = 0, dst_got = 0, err, dirty;
1951 bool do_final_copy = false;
1953 if (src_inode->i_sb != dst_inode->i_sb) {
1954 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
1956 if (ceph_fsid_compare(&src_fsc->client->fsid,
1957 &dst_fsc->client->fsid)) {
1958 dout("Copying files across clusters: src: %pU dst: %pU\n",
1959 &src_fsc->client->fsid, &dst_fsc->client->fsid);
1963 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
1967 * Some of the checks below will return -EOPNOTSUPP, which will force a
1968 * fallback to the default VFS copy_file_range implementation. This is
1969 * desirable in several cases (for ex, the 'len' is smaller than the
1970 * size of the objects, or in cases where that would be more
1974 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
1978 * Striped file layouts require that we copy partial objects, but the
1979 * OSD copy-from operation only supports full-object copies. Limit
1980 * this to non-striped file layouts for now.
1982 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
1983 (src_ci->i_layout.stripe_count != 1) ||
1984 (dst_ci->i_layout.stripe_count != 1) ||
1985 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
1986 dout("Invalid src/dst files layout\n");
1990 if (len < src_ci->i_layout.object_size)
1991 return -EOPNOTSUPP; /* no remote copy will be done */
1993 prealloc_cf = ceph_alloc_cap_flush();
1997 /* Start by sync'ing the source and destination files */
1998 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2000 dout("failed to write src file (%zd)\n", ret);
2003 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2005 dout("failed to write dst file (%zd)\n", ret);
2010 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2011 * clients may have dirty data in their caches. And OSDs know nothing
2012 * about caps, so they can't safely do the remote object copies.
2014 err = get_rd_wr_caps(src_file, &src_got,
2015 dst_file, (dst_off + len), &dst_got);
2017 dout("get_rd_wr_caps returned %d\n", err);
2022 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2026 size = i_size_read(dst_inode);
2027 endoff = dst_off + len;
2029 /* Drop dst file cached pages */
2030 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2031 dst_off >> PAGE_SHIFT,
2032 endoff >> PAGE_SHIFT);
2034 dout("Failed to invalidate inode pages (%zd)\n", ret);
2037 src_oloc.pool = src_ci->i_layout.pool_id;
2038 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2039 dst_oloc.pool = dst_ci->i_layout.pool_id;
2040 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2042 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2043 src_ci->i_layout.object_size,
2044 &src_objnum, &src_objoff, &src_objlen);
2045 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2046 dst_ci->i_layout.object_size,
2047 &dst_objnum, &dst_objoff, &dst_objlen);
2048 /* object-level offsets need to the same */
2049 if (src_objoff != dst_objoff) {
2055 * Do a manual copy if the object offset isn't object aligned.
2056 * 'src_objlen' contains the bytes left until the end of the object,
2057 * starting at the src_off
2061 * we need to temporarily drop all caps as we'll be calling
2062 * {read,write}_iter, which will get caps again.
2064 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2065 ret = do_splice_direct(src_file, &src_off, dst_file,
2066 &dst_off, src_objlen, flags);
2068 dout("do_splice_direct returned %d\n", err);
2072 err = get_rd_wr_caps(src_file, &src_got,
2073 dst_file, (dst_off + len), &dst_got);
2076 err = is_file_size_ok(src_inode, dst_inode,
2077 src_off, dst_off, len);
2081 object_size = src_ci->i_layout.object_size;
2082 while (len >= object_size) {
2083 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2084 object_size, &src_objnum,
2085 &src_objoff, &src_objlen);
2086 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2087 object_size, &dst_objnum,
2088 &dst_objoff, &dst_objlen);
2089 ceph_oid_init(&src_oid);
2090 ceph_oid_printf(&src_oid, "%llx.%08llx",
2091 src_ci->i_vino.ino, src_objnum);
2092 ceph_oid_init(&dst_oid);
2093 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2094 dst_ci->i_vino.ino, dst_objnum);
2095 /* Do an object remote copy */
2096 err = ceph_osdc_copy_from(
2097 &src_fsc->client->osdc,
2098 src_ci->i_vino.snap, 0,
2099 &src_oid, &src_oloc,
2100 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2101 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE,
2102 &dst_oid, &dst_oloc,
2103 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2104 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0);
2106 dout("ceph_osdc_copy_from returned %d\n", err);
2112 src_off += object_size;
2113 dst_off += object_size;
2118 /* We still need one final local copy */
2119 do_final_copy = true;
2121 file_update_time(dst_file);
2122 inode_inc_iversion_raw(dst_inode);
2124 if (endoff > size) {
2127 /* Let the MDS know about dst file size change */
2128 if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
2129 caps_flags |= CHECK_CAPS_NODELAY;
2130 if (ceph_inode_set_size(dst_inode, endoff))
2131 caps_flags |= CHECK_CAPS_AUTHONLY;
2133 ceph_check_caps(dst_ci, caps_flags, NULL);
2136 spin_lock(&dst_ci->i_ceph_lock);
2137 dst_ci->i_inline_version = CEPH_INLINE_NONE;
2138 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2139 spin_unlock(&dst_ci->i_ceph_lock);
2141 __mark_inode_dirty(dst_inode, dirty);
2144 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2146 if (do_final_copy) {
2147 err = do_splice_direct(src_file, &src_off, dst_file,
2148 &dst_off, len, flags);
2150 dout("do_splice_direct returned %d\n", err);
2158 ceph_free_cap_flush(prealloc_cf);
2163 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2164 struct file *dst_file, loff_t dst_off,
2165 size_t len, unsigned int flags)
2169 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2172 if (ret == -EOPNOTSUPP || ret == -EXDEV)
2173 ret = generic_copy_file_range(src_file, src_off, dst_file,
2174 dst_off, len, flags);
2178 const struct file_operations ceph_file_fops = {
2180 .release = ceph_release,
2181 .llseek = ceph_llseek,
2182 .read_iter = ceph_read_iter,
2183 .write_iter = ceph_write_iter,
2185 .fsync = ceph_fsync,
2187 .flock = ceph_flock,
2188 .splice_read = generic_file_splice_read,
2189 .splice_write = iter_file_splice_write,
2190 .unlocked_ioctl = ceph_ioctl,
2191 .compat_ioctl = ceph_ioctl,
2192 .fallocate = ceph_fallocate,
2193 .copy_file_range = ceph_copy_file_range,