1 #include <linux/ceph/ceph_debug.h>
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>
14 #include "mds_client.h"
17 * Ceph file operations
19 * Implement basic open/close functionality, and implement
22 * We implement three modes of file I/O:
23 * - buffered uses the generic_file_aio_{read,write} helpers
25 * - synchronous is used when there is multi-client read/write
26 * sharing, avoids the page cache, and synchronously waits for an
29 * - direct io takes the variant of the sync path that references
30 * user pages directly.
32 * fsync() flushes and waits on dirty pages, but just queues metadata
33 * for writeback: since the MDS can recover size and mtime there is no
34 * need to wait for MDS acknowledgement.
39 * Prepare an open request. Preallocate ceph_cap to avoid an
40 * inopportune ENOMEM later.
42 static struct ceph_mds_request *
43 prepare_open_request(struct super_block *sb, int flags, int create_mode)
45 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
46 struct ceph_mds_client *mdsc = fsc->mdsc;
47 struct ceph_mds_request *req;
48 int want_auth = USE_ANY_MDS;
49 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
51 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
52 want_auth = USE_AUTH_MDS;
54 req = ceph_mdsc_create_request(mdsc, op, want_auth);
57 req->r_fmode = ceph_flags_to_mode(flags);
58 req->r_args.open.flags = cpu_to_le32(flags);
59 req->r_args.open.mode = cpu_to_le32(create_mode);
65 * initialize private struct file data.
66 * if we fail, clean up by dropping fmode reference on the ceph_inode
68 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
70 struct ceph_file_info *cf;
73 switch (inode->i_mode & S_IFMT) {
76 dout("init_file %p %p 0%o (regular)\n", inode, file,
78 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
80 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
85 file->private_data = cf;
86 BUG_ON(inode->i_fop->release != ceph_release);
90 dout("init_file %p %p 0%o (symlink)\n", inode, file,
92 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
96 dout("init_file %p %p 0%o (special)\n", inode, file,
99 * we need to drop the open ref now, since we don't
100 * have .release set to ceph_release.
102 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
103 BUG_ON(inode->i_fop->release == ceph_release);
105 /* call the proper open fop */
106 ret = inode->i_fop->open(inode, file);
112 * If we already have the requisite capabilities, we can satisfy
113 * the open request locally (no need to request new caps from the
114 * MDS). We do, however, need to inform the MDS (asynchronously)
115 * if our wanted caps set expands.
117 int ceph_open(struct inode *inode, struct file *file)
119 struct ceph_inode_info *ci = ceph_inode(inode);
120 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
121 struct ceph_mds_client *mdsc = fsc->mdsc;
122 struct ceph_mds_request *req;
123 struct ceph_file_info *cf = file->private_data;
124 struct inode *parent_inode = NULL;
126 int flags, fmode, wanted;
129 dout("open file %p is already opened\n", file);
133 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
134 flags = file->f_flags & ~(O_CREAT|O_EXCL);
135 if (S_ISDIR(inode->i_mode))
136 flags = O_DIRECTORY; /* mds likes to know */
138 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
139 ceph_vinop(inode), file, flags, file->f_flags);
140 fmode = ceph_flags_to_mode(flags);
141 wanted = ceph_caps_for_mode(fmode);
143 /* snapped files are read-only */
144 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
147 /* trivially open snapdir */
148 if (ceph_snap(inode) == CEPH_SNAPDIR) {
149 spin_lock(&ci->i_ceph_lock);
150 __ceph_get_fmode(ci, fmode);
151 spin_unlock(&ci->i_ceph_lock);
152 return ceph_init_file(inode, file, fmode);
156 * No need to block if we have caps on the auth MDS (for
157 * write) or any MDS (for read). Update wanted set
160 spin_lock(&ci->i_ceph_lock);
161 if (__ceph_is_any_real_caps(ci) &&
162 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
163 int mds_wanted = __ceph_caps_mds_wanted(ci);
164 int issued = __ceph_caps_issued(ci, NULL);
166 dout("open %p fmode %d want %s issued %s using existing\n",
167 inode, fmode, ceph_cap_string(wanted),
168 ceph_cap_string(issued));
169 __ceph_get_fmode(ci, fmode);
170 spin_unlock(&ci->i_ceph_lock);
173 if ((issued & wanted) != wanted &&
174 (mds_wanted & wanted) != wanted &&
175 ceph_snap(inode) != CEPH_SNAPDIR)
176 ceph_check_caps(ci, 0, NULL);
178 return ceph_init_file(inode, file, fmode);
179 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
180 (ci->i_snap_caps & wanted) == wanted) {
181 __ceph_get_fmode(ci, fmode);
182 spin_unlock(&ci->i_ceph_lock);
183 return ceph_init_file(inode, file, fmode);
185 spin_unlock(&ci->i_ceph_lock);
187 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
188 req = prepare_open_request(inode->i_sb, flags, 0);
193 req->r_inode = inode;
196 if (flags & (O_CREAT|O_TRUNC))
197 parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
198 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
201 err = ceph_init_file(inode, file, req->r_fmode);
202 ceph_mdsc_put_request(req);
203 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
210 * Do a lookup + open with a single request. If we get a non-existent
211 * file or symlink, return 1 so the VFS can retry.
213 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
214 struct file *file, unsigned flags, umode_t mode,
217 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
218 struct ceph_mds_client *mdsc = fsc->mdsc;
219 struct ceph_mds_request *req;
223 dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
224 dir, dentry, dentry->d_name.len, dentry->d_name.name,
225 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
227 if (dentry->d_name.len > NAME_MAX)
228 return -ENAMETOOLONG;
230 err = ceph_init_dentry(dentry);
235 req = prepare_open_request(dir->i_sb, flags, mode);
238 req->r_dentry = dget(dentry);
240 if (flags & O_CREAT) {
241 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
242 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
244 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
245 err = ceph_mdsc_do_request(mdsc,
246 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
251 err = ceph_handle_snapdir(req, dentry, err);
252 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
253 err = ceph_handle_notrace_create(dir, dentry);
255 if (d_unhashed(dentry)) {
256 dn = ceph_finish_lookup(req, dentry, err);
260 /* we were given a hashed negative dentry */
265 if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
266 /* make vfs retry on splice, ENOENT, or symlink */
267 dout("atomic_open finish_no_open on dn %p\n", dn);
268 err = finish_no_open(file, dn);
270 dout("atomic_open finish_open on dn %p\n", dn);
271 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
272 *opened |= FILE_CREATED;
274 err = finish_open(file, dentry, ceph_open, opened);
278 ceph_mdsc_put_request(req);
279 dout("atomic_open result=%d\n", err);
283 int ceph_release(struct inode *inode, struct file *file)
285 struct ceph_inode_info *ci = ceph_inode(inode);
286 struct ceph_file_info *cf = file->private_data;
288 dout("release inode %p file %p\n", inode, file);
289 ceph_put_fmode(ci, cf->fmode);
290 if (cf->last_readdir)
291 ceph_mdsc_put_request(cf->last_readdir);
292 kfree(cf->last_name);
295 kmem_cache_free(ceph_file_cachep, cf);
297 /* wake up anyone waiting for caps on this inode */
298 wake_up_all(&ci->i_cap_wq);
303 * Read a range of bytes striped over one or more objects. Iterate over
304 * objects we stripe over. (That's not atomic, but good enough for now.)
306 * If we get a short result from the OSD, check against i_size; we need to
307 * only return a short read to the caller if we hit EOF.
309 static int striped_read(struct inode *inode,
311 struct page **pages, int num_pages,
312 int *checkeof, bool o_direct,
313 unsigned long buf_align)
315 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
316 struct ceph_inode_info *ci = ceph_inode(inode);
317 u64 pos, this_len, left;
318 int io_align, page_align;
321 struct page **page_pos;
323 bool hit_stripe, was_short;
326 * we may need to do multiple reads. not atomic, unfortunately.
331 pages_left = num_pages;
333 io_align = off & ~PAGE_MASK;
337 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
339 page_align = pos & ~PAGE_MASK;
341 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
342 &ci->i_layout, pos, &this_len,
345 page_pos, pages_left, page_align);
348 hit_stripe = this_len < left;
349 was_short = ret >= 0 && ret < this_len;
350 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
351 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
354 int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
356 if (read < pos - off) {
357 dout(" zero gap %llu to %llu\n", off + read, pos);
358 ceph_zero_page_vector_range(page_align + read,
359 pos - off - read, pages);
364 page_pos += didpages;
365 pages_left -= didpages;
368 if (left && hit_stripe)
373 /* did we bounce off eof? */
374 if (pos + left > inode->i_size)
377 /* zero trailing bytes (inside i_size) */
378 if (left > 0 && pos < inode->i_size) {
379 if (pos + left > inode->i_size)
380 left = inode->i_size - pos;
382 dout("zero tail %llu\n", left);
383 ceph_zero_page_vector_range(page_align + read, left,
391 dout("striped_read returns %d\n", ret);
396 * Completely synchronous read and write methods. Direct from __user
397 * buffer to osd, or directly to user pages (if O_DIRECT).
399 * If the read spans object boundary, just do multiple reads.
401 static ssize_t ceph_sync_read(struct file *file, char __user *data,
402 unsigned len, loff_t *poff, int *checkeof)
404 struct inode *inode = file_inode(file);
409 dout("sync_read on file %p %llu~%u %s\n", file, off, len,
410 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
412 if (file->f_flags & O_DIRECT) {
413 num_pages = calc_pages_for((unsigned long)data, len);
414 pages = ceph_get_direct_page_vector(data, num_pages, true);
416 num_pages = calc_pages_for(off, len);
417 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
420 return PTR_ERR(pages);
423 * flush any page cache pages in this range. this
424 * will make concurrent normal and sync io slow,
425 * but it will at least behave sensibly when they are
428 ret = filemap_write_and_wait(inode->i_mapping);
432 ret = striped_read(inode, off, len, pages, num_pages, checkeof,
433 file->f_flags & O_DIRECT,
434 (unsigned long)data & ~PAGE_MASK);
436 if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
437 ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
442 if (file->f_flags & O_DIRECT)
443 ceph_put_page_vector(pages, num_pages, true);
445 ceph_release_page_vector(pages, num_pages);
446 dout("sync_read result %d\n", ret);
451 * Write commit request unsafe callback, called to tell us when a
452 * request is unsafe (that is, in flight--has been handed to the
453 * messenger to send to its target osd). It is called again when
454 * we've received a response message indicating the request is
455 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
456 * is completed early (and unsuccessfully) due to a timeout or
459 * This is used if we requested both an ACK and ONDISK commit reply
462 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
464 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
466 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
469 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
470 spin_lock(&ci->i_unsafe_lock);
471 list_add_tail(&req->r_unsafe_item,
472 &ci->i_unsafe_writes);
473 spin_unlock(&ci->i_unsafe_lock);
475 spin_lock(&ci->i_unsafe_lock);
476 list_del_init(&req->r_unsafe_item);
477 spin_unlock(&ci->i_unsafe_lock);
478 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
483 * Synchronous write, straight from __user pointer or user pages (if
486 * If write spans object boundary, just do multiple writes. (For a
487 * correct atomic write, we should e.g. take write locks on all
488 * objects, rollback on failure, etc.)
490 static ssize_t ceph_sync_write(struct file *file, const char __user *data,
491 size_t left, loff_t pos, loff_t *ppos)
493 struct inode *inode = file_inode(file);
494 struct ceph_inode_info *ci = ceph_inode(inode);
495 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
496 struct ceph_snap_context *snapc;
497 struct ceph_vino vino;
498 struct ceph_osd_request *req;
506 int page_align, io_align;
507 unsigned long buf_align;
509 struct timespec mtime = CURRENT_TIME;
510 bool own_pages = false;
512 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
515 dout("sync_write on file %p %lld~%u %s\n", file, pos,
516 (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
518 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
522 ret = invalidate_inode_pages2_range(inode->i_mapping,
523 pos >> PAGE_CACHE_SHIFT,
524 (pos + left) >> PAGE_CACHE_SHIFT);
526 dout("invalidate_inode_pages2_range returned %d\n", ret);
528 flags = CEPH_OSD_FLAG_ORDERSNAP |
529 CEPH_OSD_FLAG_ONDISK |
531 if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
532 flags |= CEPH_OSD_FLAG_ACK;
534 num_ops++; /* Also include a 'startsync' command. */
537 * we may need to do multiple writes here if we span an object
538 * boundary. this isn't atomic, unfortunately. :(
541 io_align = pos & ~PAGE_MASK;
542 buf_align = (unsigned long)data & ~PAGE_MASK;
545 snapc = ci->i_snap_realm->cached_context;
546 vino = ceph_vino(inode);
547 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
548 vino, pos, &len, num_ops,
549 CEPH_OSD_OP_WRITE, flags, snapc,
550 ci->i_truncate_seq, ci->i_truncate_size,
555 /* write from beginning of first page, regardless of io alignment */
556 page_align = file->f_flags & O_DIRECT ? buf_align : io_align;
557 num_pages = calc_pages_for(page_align, len);
558 if (file->f_flags & O_DIRECT) {
559 pages = ceph_get_direct_page_vector(data, num_pages, false);
561 ret = PTR_ERR(pages);
566 * throw out any page cache pages in this range. this
569 truncate_inode_pages_range(inode->i_mapping, pos,
570 (pos+len) | (PAGE_CACHE_SIZE-1));
572 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
574 ret = PTR_ERR(pages);
577 ret = ceph_copy_user_to_page_vector(pages, data, pos, len);
579 ceph_release_page_vector(pages, num_pages);
583 if ((file->f_flags & O_SYNC) == 0) {
584 /* get a second commit callback */
585 req->r_unsafe_callback = ceph_sync_write_unsafe;
586 req->r_inode = inode;
590 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
593 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
594 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
596 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
598 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
600 if (file->f_flags & O_DIRECT)
601 ceph_put_page_vector(pages, num_pages, false);
602 else if (file->f_flags & O_SYNC)
603 ceph_release_page_vector(pages, num_pages);
606 ceph_osdc_put_request(req);
617 if (pos > i_size_read(inode))
618 check_caps = ceph_inode_set_size(inode, pos);
620 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
627 * Wrap generic_file_aio_read with checks for cap bits on the inode.
628 * Atomically grab references, so that those bits are not released
629 * back to the MDS mid-read.
631 * Hmm, the sync read case isn't actually async... should it be?
633 static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
634 unsigned long nr_segs, loff_t pos)
636 struct file *filp = iocb->ki_filp;
637 struct ceph_file_info *fi = filp->private_data;
638 loff_t *ppos = &iocb->ki_pos;
639 size_t len = iov->iov_len;
640 struct inode *inode = file_inode(filp);
641 struct ceph_inode_info *ci = ceph_inode(inode);
642 void __user *base = iov->iov_base;
645 int checkeof = 0, read = 0;
647 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
648 inode, ceph_vinop(inode), pos, (unsigned)len, inode);
650 if (fi->fmode & CEPH_FILE_MODE_LAZY)
651 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
653 want = CEPH_CAP_FILE_CACHE;
654 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
657 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
658 inode, ceph_vinop(inode), pos, (unsigned)len,
659 ceph_cap_string(got));
661 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
662 (iocb->ki_filp->f_flags & O_DIRECT) ||
663 (fi->flags & CEPH_F_SYNC))
664 /* hmm, this isn't really async... */
665 ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
667 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
670 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
671 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
672 ceph_put_cap_refs(ci, got);
674 if (checkeof && ret >= 0) {
675 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
677 /* hit EOF or hole? */
678 if (statret == 0 && *ppos < inode->i_size) {
679 dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
694 * Take cap references to avoid releasing caps to MDS mid-write.
696 * If we are synchronous, and write with an old snap context, the OSD
697 * may return EOLDSNAPC. In that case, retry the write.. _after_
698 * dropping our cap refs and allowing the pending snap to logically
699 * complete _before_ this write occurs.
701 * If we are near ENOSPC, write synchronously.
703 static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
704 unsigned long nr_segs, loff_t pos)
706 struct file *file = iocb->ki_filp;
707 struct ceph_file_info *fi = file->private_data;
708 struct inode *inode = file_inode(file);
709 struct ceph_inode_info *ci = ceph_inode(inode);
710 struct ceph_osd_client *osdc =
711 &ceph_sb_to_client(inode->i_sb)->client->osdc;
712 ssize_t count, written = 0;
715 if (ceph_snap(inode) != CEPH_NOSNAP)
718 mutex_lock(&inode->i_mutex);
720 err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
724 /* We can write back this queue in page reclaim */
725 current->backing_dev_info = file->f_mapping->backing_dev_info;
727 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
734 err = file_remove_suid(file);
738 err = file_update_time(file);
743 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
748 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
749 inode, ceph_vinop(inode), pos, count, inode->i_size);
750 if (fi->fmode & CEPH_FILE_MODE_LAZY)
751 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
753 want = CEPH_CAP_FILE_BUFFER;
755 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
759 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
760 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
762 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
763 (iocb->ki_filp->f_flags & O_DIRECT) ||
764 (fi->flags & CEPH_F_SYNC)) {
765 mutex_unlock(&inode->i_mutex);
766 written = ceph_sync_write(file, iov->iov_base, count,
768 if (written == -EOLDSNAPC) {
769 dout("aio_write %p %llx.%llx %llu~%u"
770 "got EOLDSNAPC, retrying\n",
771 inode, ceph_vinop(inode),
772 pos, (unsigned)iov->iov_len);
773 mutex_lock(&inode->i_mutex);
778 * No need to acquire the i_truncate_mutex. Because
779 * the MDS revokes Fwb caps before sending truncate
780 * message to us. We can't get Fwb cap while there
781 * are pending vmtruncate. So write and vmtruncate
782 * can not run at the same time
784 written = generic_file_buffered_write(iocb, iov, nr_segs,
787 mutex_unlock(&inode->i_mutex);
792 spin_lock(&ci->i_ceph_lock);
793 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
794 spin_unlock(&ci->i_ceph_lock);
796 __mark_inode_dirty(inode, dirty);
799 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
800 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
801 ceph_cap_string(got));
802 ceph_put_cap_refs(ci, got);
805 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
806 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
807 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
815 mutex_unlock(&inode->i_mutex);
817 current->backing_dev_info = NULL;
818 return written ? written : err;
822 * llseek. be sure to verify file size on SEEK_END.
824 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
826 struct inode *inode = file->f_mapping->host;
829 mutex_lock(&inode->i_mutex);
831 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
832 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
841 offset += inode->i_size;
845 * Here we special-case the lseek(fd, 0, SEEK_CUR)
846 * position-querying operation. Avoid rewriting the "same"
847 * f_pos value back to the file because a concurrent read(),
848 * write() or lseek() might have altered it
851 offset = file->f_pos;
854 offset += file->f_pos;
857 if (offset >= inode->i_size) {
863 if (offset >= inode->i_size) {
867 offset = inode->i_size;
871 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
874 mutex_unlock(&inode->i_mutex);
878 static inline void ceph_zero_partial_page(
879 struct inode *inode, loff_t offset, unsigned size)
882 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
884 page = find_lock_page(inode->i_mapping, index);
886 wait_on_page_writeback(page);
887 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
889 page_cache_release(page);
893 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
896 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
897 if (offset < nearly) {
898 loff_t size = nearly - offset;
901 ceph_zero_partial_page(inode, offset, size);
905 if (length >= PAGE_CACHE_SIZE) {
906 loff_t size = round_down(length, PAGE_CACHE_SIZE);
907 truncate_pagecache_range(inode, offset, offset + size - 1);
912 ceph_zero_partial_page(inode, offset, length);
915 static int ceph_zero_partial_object(struct inode *inode,
916 loff_t offset, loff_t *length)
918 struct ceph_inode_info *ci = ceph_inode(inode);
919 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
920 struct ceph_osd_request *req;
926 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
929 op = CEPH_OSD_OP_ZERO;
932 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
936 CEPH_OSD_FLAG_WRITE |
937 CEPH_OSD_FLAG_ONDISK,
944 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
947 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
949 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
953 ceph_osdc_put_request(req);
959 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
962 struct ceph_inode_info *ci = ceph_inode(inode);
963 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
964 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
965 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
966 u64 object_set_size = object_size * stripe_count;
969 /* round offset up to next period boundary */
970 nearly = offset + object_set_size - 1;
972 nearly -= do_div(t, object_set_size);
974 while (length && offset < nearly) {
975 loff_t size = length;
976 ret = ceph_zero_partial_object(inode, offset, &size);
982 while (length >= object_set_size) {
985 for (i = 0; i < stripe_count; ++i) {
986 ret = ceph_zero_partial_object(inode, pos, NULL);
991 offset += object_set_size;
992 length -= object_set_size;
995 loff_t size = length;
996 ret = ceph_zero_partial_object(inode, offset, &size);
1005 static long ceph_fallocate(struct file *file, int mode,
1006 loff_t offset, loff_t length)
1008 struct ceph_file_info *fi = file->private_data;
1009 struct inode *inode = file->f_dentry->d_inode;
1010 struct ceph_inode_info *ci = ceph_inode(inode);
1011 struct ceph_osd_client *osdc =
1012 &ceph_inode_to_client(inode)->client->osdc;
1019 if (!S_ISREG(inode->i_mode))
1022 if (IS_SWAPFILE(inode))
1025 mutex_lock(&inode->i_mutex);
1027 if (ceph_snap(inode) != CEPH_NOSNAP) {
1032 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1033 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1038 size = i_size_read(inode);
1039 if (!(mode & FALLOC_FL_KEEP_SIZE))
1040 endoff = offset + length;
1042 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1043 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1045 want = CEPH_CAP_FILE_BUFFER;
1047 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
1051 if (mode & FALLOC_FL_PUNCH_HOLE) {
1053 ceph_zero_pagecache_range(inode, offset, length);
1054 ret = ceph_zero_objects(inode, offset, length);
1055 } else if (endoff > size) {
1056 truncate_pagecache_range(inode, size, -1);
1057 if (ceph_inode_set_size(inode, endoff))
1058 ceph_check_caps(ceph_inode(inode),
1059 CHECK_CAPS_AUTHONLY, NULL);
1063 spin_lock(&ci->i_ceph_lock);
1064 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1065 spin_unlock(&ci->i_ceph_lock);
1067 __mark_inode_dirty(inode, dirty);
1070 ceph_put_cap_refs(ci, got);
1072 mutex_unlock(&inode->i_mutex);
1076 const struct file_operations ceph_file_fops = {
1078 .release = ceph_release,
1079 .llseek = ceph_llseek,
1080 .read = do_sync_read,
1081 .write = do_sync_write,
1082 .aio_read = ceph_aio_read,
1083 .aio_write = ceph_aio_write,
1085 .fsync = ceph_fsync,
1087 .flock = ceph_flock,
1088 .splice_read = generic_file_splice_read,
1089 .splice_write = generic_file_splice_write,
1090 .unlocked_ioctl = ceph_ioctl,
1091 .compat_ioctl = ceph_ioctl,
1092 .fallocate = ceph_fallocate,