1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/module.h>
5 #include <linux/sched.h>
6 #include <linux/slab.h>
7 #include <linux/file.h>
8 #include <linux/mount.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/falloc.h>
14 #include "mds_client.h"
17 static __le32 ceph_flags_sys2wire(u32 flags)
21 switch (flags & O_ACCMODE) {
23 wire_flags |= CEPH_O_RDONLY;
26 wire_flags |= CEPH_O_WRONLY;
29 wire_flags |= CEPH_O_RDWR;
33 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
35 ceph_sys2wire(O_CREAT);
36 ceph_sys2wire(O_EXCL);
37 ceph_sys2wire(O_TRUNC);
38 ceph_sys2wire(O_DIRECTORY);
39 ceph_sys2wire(O_NOFOLLOW);
44 dout("unused open flags: %x", flags);
46 return cpu_to_le32(wire_flags);
50 * Ceph file operations
52 * Implement basic open/close functionality, and implement
55 * We implement three modes of file I/O:
56 * - buffered uses the generic_file_aio_{read,write} helpers
58 * - synchronous is used when there is multi-client read/write
59 * sharing, avoids the page cache, and synchronously waits for an
62 * - direct io takes the variant of the sync path that references
63 * user pages directly.
65 * fsync() flushes and waits on dirty pages, but just queues metadata
66 * for writeback: since the MDS can recover size and mtime there is no
67 * need to wait for MDS acknowledgement.
71 * Calculate the length sum of direct io vectors that can
72 * be combined into one page vector.
74 static size_t dio_get_pagev_size(const struct iov_iter *it)
76 const struct iovec *iov = it->iov;
77 const struct iovec *iovend = iov + it->nr_segs;
80 size = iov->iov_len - it->iov_offset;
82 * An iov can be page vectored when both the current tail
83 * and the next base are page aligned.
85 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
86 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
89 dout("dio_get_pagevlen len = %zu\n", size);
94 * Allocate a page vector based on (@it, @nbytes).
95 * The return value is the tuple describing a page vector,
96 * that is (@pages, @page_align, @num_pages).
99 dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
100 size_t *page_align, int *num_pages)
102 struct iov_iter tmp_it = *it;
105 int ret = 0, idx, npages;
107 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
109 npages = calc_pages_for(align, nbytes);
110 pages = kvmalloc(sizeof(*pages) * npages, GFP_KERNEL);
112 return ERR_PTR(-ENOMEM);
114 for (idx = 0; idx < npages; ) {
116 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
117 npages - idx, &start);
121 iov_iter_advance(&tmp_it, ret);
123 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
129 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
132 ceph_put_page_vector(pages, idx, false);
137 * Prepare an open request. Preallocate ceph_cap to avoid an
138 * inopportune ENOMEM later.
140 static struct ceph_mds_request *
141 prepare_open_request(struct super_block *sb, int flags, int create_mode)
143 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
144 struct ceph_mds_client *mdsc = fsc->mdsc;
145 struct ceph_mds_request *req;
146 int want_auth = USE_ANY_MDS;
147 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
149 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
150 want_auth = USE_AUTH_MDS;
152 req = ceph_mdsc_create_request(mdsc, op, want_auth);
155 req->r_fmode = ceph_flags_to_mode(flags);
156 req->r_args.open.flags = ceph_flags_sys2wire(flags);
157 req->r_args.open.mode = cpu_to_le32(create_mode);
163 * initialize private struct file data.
164 * if we fail, clean up by dropping fmode reference on the ceph_inode
166 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
168 struct ceph_file_info *cf;
171 switch (inode->i_mode & S_IFMT) {
173 ceph_fscache_register_inode_cookie(inode);
174 ceph_fscache_file_set_cookie(inode, file);
176 dout("init_file %p %p 0%o (regular)\n", inode, file,
178 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
180 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
185 cf->readdir_cache_idx = -1;
186 file->private_data = cf;
187 BUG_ON(inode->i_fop->release != ceph_release);
191 dout("init_file %p %p 0%o (symlink)\n", inode, file,
193 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
197 dout("init_file %p %p 0%o (special)\n", inode, file,
200 * we need to drop the open ref now, since we don't
201 * have .release set to ceph_release.
203 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
204 BUG_ON(inode->i_fop->release == ceph_release);
206 /* call the proper open fop */
207 ret = inode->i_fop->open(inode, file);
213 * try renew caps after session gets killed.
215 int ceph_renew_caps(struct inode *inode)
217 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
218 struct ceph_inode_info *ci = ceph_inode(inode);
219 struct ceph_mds_request *req;
220 int err, flags, wanted;
222 spin_lock(&ci->i_ceph_lock);
223 wanted = __ceph_caps_file_wanted(ci);
224 if (__ceph_is_any_real_caps(ci) &&
225 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
226 int issued = __ceph_caps_issued(ci, NULL);
227 spin_unlock(&ci->i_ceph_lock);
228 dout("renew caps %p want %s issued %s updating mds_wanted\n",
229 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
230 ceph_check_caps(ci, 0, NULL);
233 spin_unlock(&ci->i_ceph_lock);
236 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
238 else if (wanted & CEPH_CAP_FILE_RD)
240 else if (wanted & CEPH_CAP_FILE_WR)
243 if (wanted & CEPH_CAP_FILE_LAZYIO)
247 req = prepare_open_request(inode->i_sb, flags, 0);
253 req->r_inode = inode;
258 err = ceph_mdsc_do_request(mdsc, NULL, req);
259 ceph_mdsc_put_request(req);
261 dout("renew caps %p open result=%d\n", inode, err);
262 return err < 0 ? err : 0;
266 * If we already have the requisite capabilities, we can satisfy
267 * the open request locally (no need to request new caps from the
268 * MDS). We do, however, need to inform the MDS (asynchronously)
269 * if our wanted caps set expands.
271 int ceph_open(struct inode *inode, struct file *file)
273 struct ceph_inode_info *ci = ceph_inode(inode);
274 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
275 struct ceph_mds_client *mdsc = fsc->mdsc;
276 struct ceph_mds_request *req;
277 struct ceph_file_info *cf = file->private_data;
279 int flags, fmode, wanted;
282 dout("open file %p is already opened\n", file);
286 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
287 flags = file->f_flags & ~(O_CREAT|O_EXCL);
288 if (S_ISDIR(inode->i_mode))
289 flags = O_DIRECTORY; /* mds likes to know */
291 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
292 ceph_vinop(inode), file, flags, file->f_flags);
293 fmode = ceph_flags_to_mode(flags);
294 wanted = ceph_caps_for_mode(fmode);
296 /* snapped files are read-only */
297 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
300 /* trivially open snapdir */
301 if (ceph_snap(inode) == CEPH_SNAPDIR) {
302 spin_lock(&ci->i_ceph_lock);
303 __ceph_get_fmode(ci, fmode);
304 spin_unlock(&ci->i_ceph_lock);
305 return ceph_init_file(inode, file, fmode);
309 * No need to block if we have caps on the auth MDS (for
310 * write) or any MDS (for read). Update wanted set
313 spin_lock(&ci->i_ceph_lock);
314 if (__ceph_is_any_real_caps(ci) &&
315 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
316 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
317 int issued = __ceph_caps_issued(ci, NULL);
319 dout("open %p fmode %d want %s issued %s using existing\n",
320 inode, fmode, ceph_cap_string(wanted),
321 ceph_cap_string(issued));
322 __ceph_get_fmode(ci, fmode);
323 spin_unlock(&ci->i_ceph_lock);
326 if ((issued & wanted) != wanted &&
327 (mds_wanted & wanted) != wanted &&
328 ceph_snap(inode) != CEPH_SNAPDIR)
329 ceph_check_caps(ci, 0, NULL);
331 return ceph_init_file(inode, file, fmode);
332 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
333 (ci->i_snap_caps & wanted) == wanted) {
334 __ceph_get_fmode(ci, fmode);
335 spin_unlock(&ci->i_ceph_lock);
336 return ceph_init_file(inode, file, fmode);
339 spin_unlock(&ci->i_ceph_lock);
341 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
342 req = prepare_open_request(inode->i_sb, flags, 0);
347 req->r_inode = inode;
351 err = ceph_mdsc_do_request(mdsc, NULL, req);
353 err = ceph_init_file(inode, file, req->r_fmode);
354 ceph_mdsc_put_request(req);
355 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
362 * Do a lookup + open with a single request. If we get a non-existent
363 * file or symlink, return 1 so the VFS can retry.
365 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
366 struct file *file, unsigned flags, umode_t mode,
369 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
370 struct ceph_mds_client *mdsc = fsc->mdsc;
371 struct ceph_mds_request *req;
373 struct ceph_acls_info acls = {};
377 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
379 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
381 if (dentry->d_name.len > NAME_MAX)
382 return -ENAMETOOLONG;
385 * Do not truncate the file, since atomic_open is called before the
386 * permission check. The caller will do the truncation afterward.
390 if (flags & O_CREAT) {
391 err = ceph_pre_init_acls(dir, &mode, &acls);
397 req = prepare_open_request(dir->i_sb, flags, mode);
402 req->r_dentry = dget(dentry);
404 if (flags & O_CREAT) {
405 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
406 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
408 req->r_pagelist = acls.pagelist;
409 acls.pagelist = NULL;
413 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
414 if (ceph_security_xattr_wanted(dir))
415 mask |= CEPH_CAP_XATTR_SHARED;
416 req->r_args.open.mask = cpu_to_le32(mask);
419 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
420 err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
421 err = ceph_handle_snapdir(req, dentry, err);
425 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
426 err = ceph_handle_notrace_create(dir, dentry);
428 if (d_in_lookup(dentry)) {
429 dn = ceph_finish_lookup(req, dentry, err);
433 /* we were given a hashed negative dentry */
438 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
439 /* make vfs retry on splice, ENOENT, or symlink */
440 dout("atomic_open finish_no_open on dn %p\n", dn);
441 err = finish_no_open(file, dn);
443 dout("atomic_open finish_open on dn %p\n", dn);
444 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
445 ceph_init_inode_acls(d_inode(dentry), &acls);
446 *opened |= FILE_CREATED;
448 err = finish_open(file, dentry, ceph_open, opened);
451 if (!req->r_err && req->r_target_inode)
452 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
453 ceph_mdsc_put_request(req);
455 ceph_release_acls_info(&acls);
456 dout("atomic_open result=%d\n", err);
460 int ceph_release(struct inode *inode, struct file *file)
462 struct ceph_inode_info *ci = ceph_inode(inode);
463 struct ceph_file_info *cf = file->private_data;
465 dout("release inode %p file %p\n", inode, file);
466 ceph_put_fmode(ci, cf->fmode);
467 if (cf->last_readdir)
468 ceph_mdsc_put_request(cf->last_readdir);
469 kfree(cf->last_name);
471 kmem_cache_free(ceph_file_cachep, cf);
473 /* wake up anyone waiting for caps on this inode */
474 wake_up_all(&ci->i_cap_wq);
485 * Read a range of bytes striped over one or more objects. Iterate over
486 * objects we stripe over. (That's not atomic, but good enough for now.)
488 * If we get a short result from the OSD, check against i_size; we need to
489 * only return a short read to the caller if we hit EOF.
491 static int striped_read(struct inode *inode,
493 struct page **pages, int num_pages,
494 int page_align, int *checkeof)
496 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
497 struct ceph_inode_info *ci = ceph_inode(inode);
502 bool hit_stripe, was_short;
505 * we may need to do multiple reads. not atomic, unfortunately.
509 page_idx = (page_align + read) >> PAGE_SHIFT;
510 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
511 &ci->i_layout, pos, &this_len,
512 ci->i_truncate_seq, ci->i_truncate_size,
513 pages + page_idx, num_pages - page_idx,
514 ((page_align + read) & ~PAGE_MASK));
517 hit_stripe = this_len < len;
518 was_short = ret >= 0 && ret < this_len;
519 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
520 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
522 i_size = i_size_read(inode);
524 if (was_short && (pos + ret < i_size)) {
525 int zlen = min(this_len - ret, i_size - pos - ret);
526 int zoff = page_align + read + ret;
527 dout(" zero gap %llu to %llu\n",
528 pos + ret, pos + ret + zlen);
529 ceph_zero_page_vector_range(zoff, zlen, pages);
537 /* hit stripe and need continue*/
538 if (len && hit_stripe && pos < i_size)
544 /* did we bounce off eof? */
545 if (pos + len > i_size)
546 *checkeof = CHECK_EOF;
549 dout("striped_read returns %d\n", ret);
554 * Completely synchronous read and write methods. Direct from __user
555 * buffer to osd, or directly to user pages (if O_DIRECT).
557 * If the read spans object boundary, just do multiple reads.
559 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
562 struct file *file = iocb->ki_filp;
563 struct inode *inode = file_inode(file);
565 u64 off = iocb->ki_pos;
568 size_t len = iov_iter_count(to);
570 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
571 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
576 * flush any page cache pages in this range. this
577 * will make concurrent normal and sync io slow,
578 * but it will at least behave sensibly when they are
581 ret = filemap_write_and_wait_range(inode->i_mapping, off,
586 if (unlikely(to->type & ITER_PIPE)) {
588 ret = iov_iter_get_pages_alloc(to, &pages, len,
592 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
594 ret = striped_read(inode, off, ret, pages, num_pages,
597 iov_iter_advance(to, ret);
600 iov_iter_advance(to, 0);
602 ceph_put_page_vector(pages, num_pages, false);
604 num_pages = calc_pages_for(off, len);
605 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
607 return PTR_ERR(pages);
609 ret = striped_read(inode, off, len, pages, num_pages,
610 (off & ~PAGE_MASK), checkeof);
616 size_t page_off = off & ~PAGE_MASK;
617 size_t copy = min_t(size_t, left,
618 PAGE_SIZE - page_off);
619 l = copy_page_to_iter(pages[k++], page_off,
627 ceph_release_page_vector(pages, num_pages);
630 if (off > iocb->ki_pos) {
631 ret = off - iocb->ki_pos;
635 dout("sync_read result %zd\n", ret);
639 struct ceph_aio_request {
645 struct list_head osd_reqs;
647 atomic_t pending_reqs;
648 struct timespec mtime;
649 struct ceph_cap_flush *prealloc_cf;
652 struct ceph_aio_work {
653 struct work_struct work;
654 struct ceph_osd_request *req;
657 static void ceph_aio_retry_work(struct work_struct *work);
659 static void ceph_aio_complete(struct inode *inode,
660 struct ceph_aio_request *aio_req)
662 struct ceph_inode_info *ci = ceph_inode(inode);
665 if (!atomic_dec_and_test(&aio_req->pending_reqs))
668 ret = aio_req->error;
670 ret = aio_req->total_len;
672 dout("ceph_aio_complete %p rc %d\n", inode, ret);
674 if (ret >= 0 && aio_req->write) {
677 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
678 if (endoff > i_size_read(inode)) {
679 if (ceph_inode_set_size(inode, endoff))
680 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
683 spin_lock(&ci->i_ceph_lock);
684 ci->i_inline_version = CEPH_INLINE_NONE;
685 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
686 &aio_req->prealloc_cf);
687 spin_unlock(&ci->i_ceph_lock);
689 __mark_inode_dirty(inode, dirty);
693 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
696 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
698 ceph_free_cap_flush(aio_req->prealloc_cf);
702 static void ceph_aio_complete_req(struct ceph_osd_request *req)
704 int rc = req->r_result;
705 struct inode *inode = req->r_inode;
706 struct ceph_aio_request *aio_req = req->r_priv;
707 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
708 int num_pages = calc_pages_for((u64)osd_data->alignment,
711 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
712 inode, rc, osd_data->length);
714 if (rc == -EOLDSNAPC) {
715 struct ceph_aio_work *aio_work;
716 BUG_ON(!aio_req->write);
718 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
720 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
722 queue_work(ceph_inode_to_client(inode)->wb_wq,
727 } else if (!aio_req->write) {
730 if (rc >= 0 && osd_data->length > rc) {
731 int zoff = osd_data->alignment + rc;
732 int zlen = osd_data->length - rc;
734 * If read is satisfied by single OSD request,
735 * it can pass EOF. Otherwise read is within
738 if (aio_req->num_reqs == 1) {
739 loff_t i_size = i_size_read(inode);
740 loff_t endoff = aio_req->iocb->ki_pos + rc;
742 zlen = min_t(size_t, zlen,
744 aio_req->total_len = rc + zlen;
748 ceph_zero_page_vector_range(zoff, zlen,
753 ceph_put_page_vector(osd_data->pages, num_pages, aio_req->should_dirty);
754 ceph_osdc_put_request(req);
757 cmpxchg(&aio_req->error, 0, rc);
759 ceph_aio_complete(inode, aio_req);
763 static void ceph_aio_retry_work(struct work_struct *work)
765 struct ceph_aio_work *aio_work =
766 container_of(work, struct ceph_aio_work, work);
767 struct ceph_osd_request *orig_req = aio_work->req;
768 struct ceph_aio_request *aio_req = orig_req->r_priv;
769 struct inode *inode = orig_req->r_inode;
770 struct ceph_inode_info *ci = ceph_inode(inode);
771 struct ceph_snap_context *snapc;
772 struct ceph_osd_request *req;
775 spin_lock(&ci->i_ceph_lock);
776 if (__ceph_have_pending_cap_snap(ci)) {
777 struct ceph_cap_snap *capsnap =
778 list_last_entry(&ci->i_cap_snaps,
779 struct ceph_cap_snap,
781 snapc = ceph_get_snap_context(capsnap->context);
783 BUG_ON(!ci->i_head_snapc);
784 snapc = ceph_get_snap_context(ci->i_head_snapc);
786 spin_unlock(&ci->i_ceph_lock);
788 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
796 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
797 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
798 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
800 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
802 ceph_osdc_put_request(req);
807 req->r_ops[0] = orig_req->r_ops[0];
809 req->r_mtime = aio_req->mtime;
810 req->r_data_offset = req->r_ops[0].extent.offset;
812 ceph_osdc_put_request(orig_req);
814 req->r_callback = ceph_aio_complete_req;
815 req->r_inode = inode;
816 req->r_priv = aio_req;
817 req->r_abort_on_full = true;
819 ret = ceph_osdc_start_request(req->r_osdc, req, false);
823 ceph_aio_complete_req(req);
826 ceph_put_snap_context(snapc);
831 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
832 struct ceph_snap_context *snapc,
833 struct ceph_cap_flush **pcf)
835 struct file *file = iocb->ki_filp;
836 struct inode *inode = file_inode(file);
837 struct ceph_inode_info *ci = ceph_inode(inode);
838 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
839 struct ceph_vino vino;
840 struct ceph_osd_request *req;
842 struct ceph_aio_request *aio_req = NULL;
846 struct timespec mtime = current_time(inode);
847 size_t count = iov_iter_count(iter);
848 loff_t pos = iocb->ki_pos;
849 bool write = iov_iter_rw(iter) == WRITE;
850 bool should_dirty = !write && iter_is_iovec(iter);
852 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
855 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
856 (write ? "write" : "read"), file, pos, (unsigned)count,
859 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
864 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
866 (pos + count) >> PAGE_SHIFT);
868 dout("invalidate_inode_pages2_range returned %d\n", ret2);
870 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
872 flags = CEPH_OSD_FLAG_READ;
875 while (iov_iter_count(iter) > 0) {
876 u64 size = dio_get_pagev_size(iter);
881 size = min_t(u64, size, fsc->mount_options->wsize);
883 size = min_t(u64, size, fsc->mount_options->rsize);
885 vino = ceph_vino(inode);
886 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
889 write ? CEPH_OSD_OP_WRITE :
901 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
903 ceph_osdc_put_request(req);
904 ret = PTR_ERR(pages);
909 * To simplify error handling, allow AIO when IO within i_size
910 * or IO can be satisfied by single OSD request.
912 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
913 (len == count || pos + count <= i_size_read(inode))) {
914 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
916 aio_req->iocb = iocb;
917 aio_req->write = write;
918 aio_req->should_dirty = should_dirty;
919 INIT_LIST_HEAD(&aio_req->osd_reqs);
921 aio_req->mtime = mtime;
922 swap(aio_req->prealloc_cf, *pcf);
930 * throw out any page cache pages in this range. this
933 truncate_inode_pages_range(inode->i_mapping, pos,
934 (pos+len) | (PAGE_SIZE - 1));
936 req->r_mtime = mtime;
939 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
943 aio_req->total_len += len;
945 atomic_inc(&aio_req->pending_reqs);
947 req->r_callback = ceph_aio_complete_req;
948 req->r_inode = inode;
949 req->r_priv = aio_req;
950 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
953 iov_iter_advance(iter, len);
957 ret = ceph_osdc_start_request(req->r_osdc, req, false);
959 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
961 size = i_size_read(inode);
965 if (ret >= 0 && ret < len && pos + ret < size) {
966 int zlen = min_t(size_t, len - ret,
968 ceph_zero_page_vector_range(start + ret, zlen,
976 ceph_put_page_vector(pages, num_pages, should_dirty);
978 ceph_osdc_put_request(req);
983 iov_iter_advance(iter, len);
985 if (!write && pos >= size)
988 if (write && pos > size) {
989 if (ceph_inode_set_size(inode, pos))
990 ceph_check_caps(ceph_inode(inode),
999 if (aio_req->num_reqs == 0) {
1004 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1007 list_splice(&aio_req->osd_reqs, &osd_reqs);
1008 while (!list_empty(&osd_reqs)) {
1009 req = list_first_entry(&osd_reqs,
1010 struct ceph_osd_request,
1012 list_del_init(&req->r_unsafe_item);
1014 ret = ceph_osdc_start_request(req->r_osdc,
1017 req->r_result = ret;
1018 ceph_aio_complete_req(req);
1021 return -EIOCBQUEUED;
1024 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1025 ret = pos - iocb->ki_pos;
1032 * Synchronous write, straight from __user pointer or user pages.
1034 * If write spans object boundary, just do multiple writes. (For a
1035 * correct atomic write, we should e.g. take write locks on all
1036 * objects, rollback on failure, etc.)
1039 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1040 struct ceph_snap_context *snapc)
1042 struct file *file = iocb->ki_filp;
1043 struct inode *inode = file_inode(file);
1044 struct ceph_inode_info *ci = ceph_inode(inode);
1045 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1046 struct ceph_vino vino;
1047 struct ceph_osd_request *req;
1048 struct page **pages;
1054 bool check_caps = false;
1055 struct timespec mtime = current_time(inode);
1056 size_t count = iov_iter_count(from);
1058 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1061 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1062 file, pos, (unsigned)count, snapc, snapc->seq);
1064 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1068 ret = invalidate_inode_pages2_range(inode->i_mapping,
1070 (pos + count) >> PAGE_SHIFT);
1072 dout("invalidate_inode_pages2_range returned %d\n", ret);
1074 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1076 while ((len = iov_iter_count(from)) > 0) {
1080 vino = ceph_vino(inode);
1081 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1082 vino, pos, &len, 0, 1,
1083 CEPH_OSD_OP_WRITE, flags, snapc,
1085 ci->i_truncate_size,
1093 * write from beginning of first page,
1094 * regardless of io alignment
1096 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1098 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1099 if (IS_ERR(pages)) {
1100 ret = PTR_ERR(pages);
1105 for (n = 0; n < num_pages; n++) {
1106 size_t plen = min_t(size_t, left, PAGE_SIZE);
1107 ret = copy_page_from_iter(pages[n], 0, plen, from);
1116 ceph_release_page_vector(pages, num_pages);
1120 req->r_inode = inode;
1122 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1125 req->r_mtime = mtime;
1126 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1128 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1131 ceph_osdc_put_request(req);
1133 ceph_set_error_write(ci);
1137 ceph_clear_error_write(ci);
1140 if (pos > i_size_read(inode)) {
1141 check_caps = ceph_inode_set_size(inode, pos);
1143 ceph_check_caps(ceph_inode(inode),
1144 CHECK_CAPS_AUTHONLY,
1150 if (ret != -EOLDSNAPC && written > 0) {
1158 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1159 * Atomically grab references, so that those bits are not released
1160 * back to the MDS mid-read.
1162 * Hmm, the sync read case isn't actually async... should it be?
1164 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1166 struct file *filp = iocb->ki_filp;
1167 struct ceph_file_info *fi = filp->private_data;
1168 size_t len = iov_iter_count(to);
1169 struct inode *inode = file_inode(filp);
1170 struct ceph_inode_info *ci = ceph_inode(inode);
1171 struct page *pinned_page = NULL;
1174 int retry_op = 0, read = 0;
1177 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1178 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1180 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1181 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1183 want = CEPH_CAP_FILE_CACHE;
1184 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1188 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1189 (iocb->ki_flags & IOCB_DIRECT) ||
1190 (fi->flags & CEPH_F_SYNC)) {
1192 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1193 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1194 ceph_cap_string(got));
1196 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1197 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1198 ret = ceph_direct_read_write(iocb, to,
1200 if (ret >= 0 && ret < len)
1201 retry_op = CHECK_EOF;
1203 ret = ceph_sync_read(iocb, to, &retry_op);
1206 retry_op = READ_INLINE;
1209 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1210 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1211 ceph_cap_string(got));
1212 current->journal_info = filp;
1213 ret = generic_file_read_iter(iocb, to);
1214 current->journal_info = NULL;
1216 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1217 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1219 put_page(pinned_page);
1222 ceph_put_cap_refs(ci, got);
1223 if (retry_op > HAVE_RETRIED && ret >= 0) {
1225 struct page *page = NULL;
1227 if (retry_op == READ_INLINE) {
1228 page = __page_cache_alloc(GFP_KERNEL);
1233 statret = __ceph_do_getattr(inode, page,
1234 CEPH_STAT_CAP_INLINE_DATA, !!page);
1238 if (statret == -ENODATA) {
1239 BUG_ON(retry_op != READ_INLINE);
1245 i_size = i_size_read(inode);
1246 if (retry_op == READ_INLINE) {
1247 BUG_ON(ret > 0 || read > 0);
1248 if (iocb->ki_pos < i_size &&
1249 iocb->ki_pos < PAGE_SIZE) {
1250 loff_t end = min_t(loff_t, i_size,
1251 iocb->ki_pos + len);
1252 end = min_t(loff_t, end, PAGE_SIZE);
1254 zero_user_segment(page, statret, end);
1255 ret = copy_page_to_iter(page,
1256 iocb->ki_pos & ~PAGE_MASK,
1257 end - iocb->ki_pos, to);
1258 iocb->ki_pos += ret;
1261 if (iocb->ki_pos < i_size && read < len) {
1262 size_t zlen = min_t(size_t, len - read,
1263 i_size - iocb->ki_pos);
1264 ret = iov_iter_zero(zlen, to);
1265 iocb->ki_pos += ret;
1268 __free_pages(page, 0);
1272 /* hit EOF or hole? */
1273 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1275 dout("sync_read hit hole, ppos %lld < size %lld"
1276 ", reading more\n", iocb->ki_pos, i_size);
1280 retry_op = HAVE_RETRIED;
1292 * Take cap references to avoid releasing caps to MDS mid-write.
1294 * If we are synchronous, and write with an old snap context, the OSD
1295 * may return EOLDSNAPC. In that case, retry the write.. _after_
1296 * dropping our cap refs and allowing the pending snap to logically
1297 * complete _before_ this write occurs.
1299 * If we are near ENOSPC, write synchronously.
1301 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1303 struct file *file = iocb->ki_filp;
1304 struct ceph_file_info *fi = file->private_data;
1305 struct inode *inode = file_inode(file);
1306 struct ceph_inode_info *ci = ceph_inode(inode);
1307 struct ceph_osd_client *osdc =
1308 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1309 struct ceph_cap_flush *prealloc_cf;
1310 ssize_t count, written = 0;
1314 if (ceph_snap(inode) != CEPH_NOSNAP)
1317 prealloc_cf = ceph_alloc_cap_flush();
1324 /* We can write back this queue in page reclaim */
1325 current->backing_dev_info = inode_to_bdi(inode);
1327 if (iocb->ki_flags & IOCB_APPEND) {
1328 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1333 err = generic_write_checks(iocb, from);
1338 count = iov_iter_count(from);
1339 err = file_remove_privs(file);
1343 err = file_update_time(file);
1347 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1348 err = ceph_uninline_data(file, NULL);
1353 /* FIXME: not complete since it doesn't account for being at quota */
1354 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1359 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1360 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1361 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1362 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1364 want = CEPH_CAP_FILE_BUFFER;
1366 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1371 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1372 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1374 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1375 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1376 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1377 struct ceph_snap_context *snapc;
1378 struct iov_iter data;
1379 inode_unlock(inode);
1381 spin_lock(&ci->i_ceph_lock);
1382 if (__ceph_have_pending_cap_snap(ci)) {
1383 struct ceph_cap_snap *capsnap =
1384 list_last_entry(&ci->i_cap_snaps,
1385 struct ceph_cap_snap,
1387 snapc = ceph_get_snap_context(capsnap->context);
1389 BUG_ON(!ci->i_head_snapc);
1390 snapc = ceph_get_snap_context(ci->i_head_snapc);
1392 spin_unlock(&ci->i_ceph_lock);
1394 /* we might need to revert back to that point */
1396 if (iocb->ki_flags & IOCB_DIRECT)
1397 written = ceph_direct_read_write(iocb, &data, snapc,
1400 written = ceph_sync_write(iocb, &data, pos, snapc);
1402 iov_iter_advance(from, written);
1403 ceph_put_snap_context(snapc);
1406 * No need to acquire the i_truncate_mutex. Because
1407 * the MDS revokes Fwb caps before sending truncate
1408 * message to us. We can't get Fwb cap while there
1409 * are pending vmtruncate. So write and vmtruncate
1410 * can not run at the same time
1412 written = generic_perform_write(file, from, pos);
1413 if (likely(written >= 0))
1414 iocb->ki_pos = pos + written;
1415 inode_unlock(inode);
1420 spin_lock(&ci->i_ceph_lock);
1421 ci->i_inline_version = CEPH_INLINE_NONE;
1422 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1424 spin_unlock(&ci->i_ceph_lock);
1426 __mark_inode_dirty(inode, dirty);
1429 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1430 inode, ceph_vinop(inode), pos, (unsigned)count,
1431 ceph_cap_string(got));
1432 ceph_put_cap_refs(ci, got);
1434 if (written == -EOLDSNAPC) {
1435 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1436 inode, ceph_vinop(inode), pos, (unsigned)count);
1441 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1442 iocb->ki_flags |= IOCB_DSYNC;
1443 written = generic_write_sync(iocb, written);
1449 inode_unlock(inode);
1451 ceph_free_cap_flush(prealloc_cf);
1452 current->backing_dev_info = NULL;
1453 return written ? written : err;
1457 * llseek. be sure to verify file size on SEEK_END.
1459 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1461 struct inode *inode = file->f_mapping->host;
1467 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1468 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1473 i_size = i_size_read(inode);
1480 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1481 * position-querying operation. Avoid rewriting the "same"
1482 * f_pos value back to the file because a concurrent read(),
1483 * write() or lseek() might have altered it
1489 offset += file->f_pos;
1492 if (offset < 0 || offset >= i_size) {
1498 if (offset < 0 || offset >= i_size) {
1506 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1509 inode_unlock(inode);
1513 static inline void ceph_zero_partial_page(
1514 struct inode *inode, loff_t offset, unsigned size)
1517 pgoff_t index = offset >> PAGE_SHIFT;
1519 page = find_lock_page(inode->i_mapping, index);
1521 wait_on_page_writeback(page);
1522 zero_user(page, offset & (PAGE_SIZE - 1), size);
1528 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1531 loff_t nearly = round_up(offset, PAGE_SIZE);
1532 if (offset < nearly) {
1533 loff_t size = nearly - offset;
1536 ceph_zero_partial_page(inode, offset, size);
1540 if (length >= PAGE_SIZE) {
1541 loff_t size = round_down(length, PAGE_SIZE);
1542 truncate_pagecache_range(inode, offset, offset + size - 1);
1547 ceph_zero_partial_page(inode, offset, length);
1550 static int ceph_zero_partial_object(struct inode *inode,
1551 loff_t offset, loff_t *length)
1553 struct ceph_inode_info *ci = ceph_inode(inode);
1554 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1555 struct ceph_osd_request *req;
1561 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1564 op = CEPH_OSD_OP_ZERO;
1567 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1571 CEPH_OSD_FLAG_WRITE,
1578 req->r_mtime = inode->i_mtime;
1579 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1581 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1585 ceph_osdc_put_request(req);
1591 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1594 struct ceph_inode_info *ci = ceph_inode(inode);
1595 s32 stripe_unit = ci->i_layout.stripe_unit;
1596 s32 stripe_count = ci->i_layout.stripe_count;
1597 s32 object_size = ci->i_layout.object_size;
1598 u64 object_set_size = object_size * stripe_count;
1601 /* round offset up to next period boundary */
1602 nearly = offset + object_set_size - 1;
1604 nearly -= do_div(t, object_set_size);
1606 while (length && offset < nearly) {
1607 loff_t size = length;
1608 ret = ceph_zero_partial_object(inode, offset, &size);
1614 while (length >= object_set_size) {
1616 loff_t pos = offset;
1617 for (i = 0; i < stripe_count; ++i) {
1618 ret = ceph_zero_partial_object(inode, pos, NULL);
1623 offset += object_set_size;
1624 length -= object_set_size;
1627 loff_t size = length;
1628 ret = ceph_zero_partial_object(inode, offset, &size);
1637 static long ceph_fallocate(struct file *file, int mode,
1638 loff_t offset, loff_t length)
1640 struct ceph_file_info *fi = file->private_data;
1641 struct inode *inode = file_inode(file);
1642 struct ceph_inode_info *ci = ceph_inode(inode);
1643 struct ceph_osd_client *osdc =
1644 &ceph_inode_to_client(inode)->client->osdc;
1645 struct ceph_cap_flush *prealloc_cf;
1652 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1655 if (!S_ISREG(inode->i_mode))
1658 prealloc_cf = ceph_alloc_cap_flush();
1664 if (ceph_snap(inode) != CEPH_NOSNAP) {
1669 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1670 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1675 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1676 ret = ceph_uninline_data(file, NULL);
1681 size = i_size_read(inode);
1682 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
1683 endoff = offset + length;
1684 ret = inode_newsize_ok(inode, endoff);
1689 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1690 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1692 want = CEPH_CAP_FILE_BUFFER;
1694 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1698 if (mode & FALLOC_FL_PUNCH_HOLE) {
1700 ceph_zero_pagecache_range(inode, offset, length);
1701 ret = ceph_zero_objects(inode, offset, length);
1702 } else if (endoff > size) {
1703 truncate_pagecache_range(inode, size, -1);
1704 if (ceph_inode_set_size(inode, endoff))
1705 ceph_check_caps(ceph_inode(inode),
1706 CHECK_CAPS_AUTHONLY, NULL);
1710 spin_lock(&ci->i_ceph_lock);
1711 ci->i_inline_version = CEPH_INLINE_NONE;
1712 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1714 spin_unlock(&ci->i_ceph_lock);
1716 __mark_inode_dirty(inode, dirty);
1719 ceph_put_cap_refs(ci, got);
1721 inode_unlock(inode);
1722 ceph_free_cap_flush(prealloc_cf);
1726 const struct file_operations ceph_file_fops = {
1728 .release = ceph_release,
1729 .llseek = ceph_llseek,
1730 .read_iter = ceph_read_iter,
1731 .write_iter = ceph_write_iter,
1733 .fsync = ceph_fsync,
1735 .setlease = simple_nosetlease,
1736 .flock = ceph_flock,
1737 .splice_read = generic_file_splice_read,
1738 .splice_write = iter_file_splice_write,
1739 .unlocked_ioctl = ceph_ioctl,
1740 .compat_ioctl = ceph_ioctl,
1741 .fallocate = ceph_fallocate,