1 #include "ceph_debug.h"
3 #include <linux/sched.h>
4 #include <linux/file.h>
5 #include <linux/namei.h>
6 #include <linux/writeback.h>
9 #include "mds_client.h"
12 * Ceph file operations
14 * Implement basic open/close functionality, and implement
17 * We implement three modes of file I/O:
18 * - buffered uses the generic_file_aio_{read,write} helpers
20 * - synchronous is used when there is multi-client read/write
21 * sharing, avoids the page cache, and synchronously waits for an
24 * - direct io takes the variant of the sync path that references
25 * user pages directly.
27 * fsync() flushes and waits on dirty pages, but just queues metadata
28 * for writeback: since the MDS can recover size and mtime there is no
29 * need to wait for MDS acknowledgement.
34 * Prepare an open request. Preallocate ceph_cap to avoid an
35 * inopportune ENOMEM later.
37 static struct ceph_mds_request *
38 prepare_open_request(struct super_block *sb, int flags, int create_mode)
40 struct ceph_client *client = ceph_sb_to_client(sb);
41 struct ceph_mds_client *mdsc = &client->mdsc;
42 struct ceph_mds_request *req;
43 int want_auth = USE_ANY_MDS;
44 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
46 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
47 want_auth = USE_AUTH_MDS;
49 req = ceph_mdsc_create_request(mdsc, op, want_auth);
52 req->r_fmode = ceph_flags_to_mode(flags);
53 req->r_args.open.flags = cpu_to_le32(flags);
54 req->r_args.open.mode = cpu_to_le32(create_mode);
55 req->r_args.open.preferred = cpu_to_le32(-1);
61 * initialize private struct file data.
62 * if we fail, clean up by dropping fmode reference on the ceph_inode
64 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
66 struct ceph_file_info *cf;
69 switch (inode->i_mode & S_IFMT) {
72 dout("init_file %p %p 0%o (regular)\n", inode, file,
74 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
76 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
81 file->private_data = cf;
82 BUG_ON(inode->i_fop->release != ceph_release);
86 dout("init_file %p %p 0%o (symlink)\n", inode, file,
88 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
92 dout("init_file %p %p 0%o (special)\n", inode, file,
95 * we need to drop the open ref now, since we don't
96 * have .release set to ceph_release.
98 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
99 BUG_ON(inode->i_fop->release == ceph_release);
101 /* call the proper open fop */
102 ret = inode->i_fop->open(inode, file);
108 * If the filp already has private_data, that means the file was
109 * already opened by intent during lookup, and we do nothing.
111 * If we already have the requisite capabilities, we can satisfy
112 * the open request locally (no need to request new caps from the
113 * MDS). We do, however, need to inform the MDS (asynchronously)
114 * if our wanted caps set expands.
116 int ceph_open(struct inode *inode, struct file *file)
118 struct ceph_inode_info *ci = ceph_inode(inode);
119 struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
120 struct ceph_mds_client *mdsc = &client->mdsc;
121 struct ceph_mds_request *req;
122 struct ceph_file_info *cf = file->private_data;
123 struct inode *parent_inode = file->f_dentry->d_parent->d_inode;
125 int flags, fmode, wanted;
128 dout("open file %p is already opened\n", file);
132 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
133 flags = file->f_flags & ~(O_CREAT|O_EXCL);
134 if (S_ISDIR(inode->i_mode))
135 flags = O_DIRECTORY; /* mds likes to know */
137 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
138 ceph_vinop(inode), file, flags, file->f_flags);
139 fmode = ceph_flags_to_mode(flags);
140 wanted = ceph_caps_for_mode(fmode);
142 /* snapped files are read-only */
143 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
146 /* trivially open snapdir */
147 if (ceph_snap(inode) == CEPH_SNAPDIR) {
148 spin_lock(&inode->i_lock);
149 __ceph_get_fmode(ci, fmode);
150 spin_unlock(&inode->i_lock);
151 return ceph_init_file(inode, file, fmode);
155 * No need to block if we have any caps. Update wanted set
158 spin_lock(&inode->i_lock);
159 if (__ceph_is_any_real_caps(ci)) {
160 int mds_wanted = __ceph_caps_mds_wanted(ci);
161 int issued = __ceph_caps_issued(ci, NULL);
163 dout("open %p fmode %d want %s issued %s using existing\n",
164 inode, fmode, ceph_cap_string(wanted),
165 ceph_cap_string(issued));
166 __ceph_get_fmode(ci, fmode);
167 spin_unlock(&inode->i_lock);
170 if ((issued & wanted) != wanted &&
171 (mds_wanted & wanted) != wanted &&
172 ceph_snap(inode) != CEPH_SNAPDIR)
173 ceph_check_caps(ci, 0, NULL);
175 return ceph_init_file(inode, file, fmode);
176 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
177 (ci->i_snap_caps & wanted) == wanted) {
178 __ceph_get_fmode(ci, fmode);
179 spin_unlock(&inode->i_lock);
180 return ceph_init_file(inode, file, fmode);
182 spin_unlock(&inode->i_lock);
184 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
185 req = prepare_open_request(inode->i_sb, flags, 0);
190 req->r_inode = igrab(inode);
192 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
194 err = ceph_init_file(inode, file, req->r_fmode);
195 ceph_mdsc_put_request(req);
196 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
203 * Do a lookup + open with a single request.
205 * If this succeeds, but some subsequent check in the vfs
206 * may_open() fails, the struct *file gets cleaned up (i.e.
207 * ceph_release gets called). So fear not!
211 * path_lookup_open -> LOOKUP_OPEN
212 * path_lookup_create -> LOOKUP_OPEN|LOOKUP_CREATE
214 struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
215 struct nameidata *nd, int mode,
218 struct ceph_client *client = ceph_sb_to_client(dir->i_sb);
219 struct ceph_mds_client *mdsc = &client->mdsc;
220 struct file *file = nd->intent.open.file;
221 struct inode *parent_inode = get_dentry_parent_inode(file->f_dentry);
222 struct ceph_mds_request *req;
224 int flags = nd->intent.open.flags - 1; /* silly vfs! */
226 dout("ceph_lookup_open dentry %p '%.*s' flags %d mode 0%o\n",
227 dentry, dentry->d_name.len, dentry->d_name.name, flags, mode);
230 req = prepare_open_request(dir->i_sb, flags, mode);
232 return ERR_PTR(PTR_ERR(req));
233 req->r_dentry = dget(dentry);
235 if (flags & O_CREAT) {
236 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
237 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
239 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
240 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
241 dentry = ceph_finish_lookup(req, dentry, err);
242 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
243 err = ceph_handle_notrace_create(dir, dentry);
245 err = ceph_init_file(req->r_dentry->d_inode, file,
247 ceph_mdsc_put_request(req);
248 dout("ceph_lookup_open result=%p\n", dentry);
252 int ceph_release(struct inode *inode, struct file *file)
254 struct ceph_inode_info *ci = ceph_inode(inode);
255 struct ceph_file_info *cf = file->private_data;
257 dout("release inode %p file %p\n", inode, file);
258 ceph_put_fmode(ci, cf->fmode);
259 if (cf->last_readdir)
260 ceph_mdsc_put_request(cf->last_readdir);
261 kfree(cf->last_name);
264 kmem_cache_free(ceph_file_cachep, cf);
269 * build a vector of user pages
271 static struct page **get_direct_page_vector(const char __user *data,
273 loff_t off, size_t len)
278 pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS);
280 return ERR_PTR(-ENOMEM);
282 down_read(¤t->mm->mmap_sem);
283 rc = get_user_pages(current, current->mm, (unsigned long)data,
284 num_pages, 0, 0, pages, NULL);
285 up_read(¤t->mm->mmap_sem);
295 static void put_page_vector(struct page **pages, int num_pages)
299 for (i = 0; i < num_pages; i++)
304 void ceph_release_page_vector(struct page **pages, int num_pages)
308 for (i = 0; i < num_pages; i++)
309 __free_pages(pages[i], 0);
314 * allocate a vector new pages
316 static struct page **alloc_page_vector(int num_pages)
321 pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS);
323 return ERR_PTR(-ENOMEM);
324 for (i = 0; i < num_pages; i++) {
325 pages[i] = alloc_page(GFP_NOFS);
326 if (pages[i] == NULL) {
327 ceph_release_page_vector(pages, i);
328 return ERR_PTR(-ENOMEM);
335 * copy user data into a page vector
337 static int copy_user_to_page_vector(struct page **pages,
338 const char __user *data,
339 loff_t off, size_t len)
342 int po = off & ~PAGE_CACHE_MASK;
347 l = min_t(int, PAGE_CACHE_SIZE-po, left);
348 bad = copy_from_user(page_address(pages[i]) + po, data, l);
354 if (po == PAGE_CACHE_SIZE) {
363 * copy user data from a page vector into a user pointer
365 static int copy_page_vector_to_user(struct page **pages, char __user *data,
366 loff_t off, size_t len)
369 int po = off & ~PAGE_CACHE_MASK;
374 l = min_t(int, left, PAGE_CACHE_SIZE-po);
375 bad = copy_to_user(data, page_address(pages[i]) + po, l);
382 if (po == PAGE_CACHE_SIZE)
391 * Zero an extent within a page vector. Offset is relative to the
392 * start of the first page.
394 static void zero_page_vector_range(int off, int len, struct page **pages)
396 int i = off >> PAGE_CACHE_SHIFT;
398 off &= ~PAGE_CACHE_MASK;
400 dout("zero_page_vector_page %u~%u\n", off, len);
402 /* leading partial page? */
404 int end = min((int)PAGE_CACHE_SIZE, off + len);
405 dout("zeroing %d %p head from %d\n", i, pages[i],
407 zero_user_segment(pages[i], off, end);
411 while (len >= PAGE_CACHE_SIZE) {
412 dout("zeroing %d %p len=%d\n", i, pages[i], len);
413 zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
414 len -= PAGE_CACHE_SIZE;
417 /* trailing partial page? */
419 dout("zeroing %d %p tail to %d\n", i, pages[i], (int)len);
420 zero_user_segment(pages[i], 0, len);
426 * Read a range of bytes striped over one or more objects. Iterate over
427 * objects we stripe over. (That's not atomic, but good enough for now.)
429 * If we get a short result from the OSD, check against i_size; we need to
430 * only return a short read to the caller if we hit EOF.
432 static int striped_read(struct inode *inode,
434 struct page **pages, int num_pages)
436 struct ceph_client *client = ceph_inode_to_client(inode);
437 struct ceph_inode_info *ci = ceph_inode(inode);
439 int page_off = off & ~PAGE_CACHE_MASK; /* first byte's offset in page */
440 int left, pages_left;
442 struct page **page_pos;
444 bool hit_stripe, was_short;
447 * we may need to do multiple reads. not atomic, unfortunately.
452 pages_left = num_pages;
457 ret = ceph_osdc_readpages(&client->osdc, ceph_vino(inode),
458 &ci->i_layout, pos, &this_len,
461 page_pos, pages_left);
462 hit_stripe = this_len < left;
463 was_short = ret >= 0 && ret < this_len;
466 dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
467 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
471 ((pos & ~PAGE_CACHE_MASK) + ret) >> PAGE_CACHE_SHIFT;
473 if (read < pos - off) {
474 dout(" zero gap %llu to %llu\n", off + read, pos);
475 zero_page_vector_range(page_off + read,
476 pos - off - read, pages);
481 page_pos += didpages;
482 pages_left -= didpages;
485 if (left && hit_stripe)
490 /* was original extent fully inside i_size? */
491 if (pos + left <= inode->i_size) {
493 zero_page_vector_range(page_off + read, len - read,
500 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
505 if (pos >= inode->i_size)
514 dout("striped_read returns %d\n", ret);
519 * Completely synchronous read and write methods. Direct from __user
520 * buffer to osd, or directly to user pages (if O_DIRECT).
522 * If the read spans object boundary, just do multiple reads.
524 static ssize_t ceph_sync_read(struct file *file, char __user *data,
525 unsigned len, loff_t *poff)
527 struct inode *inode = file->f_dentry->d_inode;
530 int num_pages = calc_pages_for(off, len);
533 dout("sync_read on file %p %llu~%u %s\n", file, off, len,
534 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
536 if (file->f_flags & O_DIRECT) {
537 pages = get_direct_page_vector(data, num_pages, off, len);
540 * flush any page cache pages in this range. this
541 * will make concurrent normal and O_DIRECT io slow,
542 * but it will at least behave sensibly when they are
546 pages = alloc_page_vector(num_pages);
549 return PTR_ERR(pages);
551 ret = filemap_write_and_wait(inode->i_mapping);
555 ret = striped_read(inode, off, len, pages, num_pages);
557 if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
558 ret = copy_page_vector_to_user(pages, data, off, ret);
563 if (file->f_flags & O_DIRECT)
564 put_page_vector(pages, num_pages);
566 ceph_release_page_vector(pages, num_pages);
567 dout("sync_read result %d\n", ret);
572 * Write commit callback, called if we requested both an ACK and
573 * ONDISK commit reply from the OSD.
575 static void sync_write_commit(struct ceph_osd_request *req,
576 struct ceph_msg *msg)
578 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
580 dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
581 spin_lock(&ci->i_unsafe_lock);
582 list_del_init(&req->r_unsafe_item);
583 spin_unlock(&ci->i_unsafe_lock);
584 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
588 * Synchronous write, straight from __user pointer or user pages (if
591 * If write spans object boundary, just do multiple writes. (For a
592 * correct atomic write, we should e.g. take write locks on all
593 * objects, rollback on failure, etc.)
595 static ssize_t ceph_sync_write(struct file *file, const char __user *data,
596 size_t left, loff_t *offset)
598 struct inode *inode = file->f_dentry->d_inode;
599 struct ceph_inode_info *ci = ceph_inode(inode);
600 struct ceph_client *client = ceph_inode_to_client(inode);
601 struct ceph_osd_request *req;
604 long long unsigned pos;
611 struct timespec mtime = CURRENT_TIME;
613 if (ceph_snap(file->f_dentry->d_inode) != CEPH_NOSNAP)
616 dout("sync_write on file %p %lld~%u %s\n", file, *offset,
617 (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
619 if (file->f_flags & O_APPEND)
620 pos = i_size_read(inode);
624 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
628 ret = invalidate_inode_pages2_range(inode->i_mapping,
629 pos >> PAGE_CACHE_SHIFT,
630 (pos + left) >> PAGE_CACHE_SHIFT);
632 dout("invalidate_inode_pages2_range returned %d\n", ret);
634 flags = CEPH_OSD_FLAG_ORDERSNAP |
635 CEPH_OSD_FLAG_ONDISK |
637 if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
638 flags |= CEPH_OSD_FLAG_ACK;
643 * we may need to do multiple writes here if we span an object
644 * boundary. this isn't atomic, unfortunately. :(
648 req = ceph_osdc_new_request(&client->osdc, &ci->i_layout,
649 ceph_vino(inode), pos, &len,
650 CEPH_OSD_OP_WRITE, flags,
651 ci->i_snap_realm->cached_context,
653 ci->i_truncate_seq, ci->i_truncate_size,
658 num_pages = calc_pages_for(pos, len);
660 if (file->f_flags & O_DIRECT) {
661 pages = get_direct_page_vector(data, num_pages, pos, len);
663 ret = PTR_ERR(pages);
668 * throw out any page cache pages in this range. this
671 truncate_inode_pages_range(inode->i_mapping, pos, pos+len);
673 pages = alloc_page_vector(num_pages);
675 ret = PTR_ERR(pages);
678 ret = copy_user_to_page_vector(pages, data, pos, len);
680 ceph_release_page_vector(pages, num_pages);
684 if ((file->f_flags & O_SYNC) == 0) {
685 /* get a second commit callback */
686 req->r_safe_callback = sync_write_commit;
687 req->r_own_pages = 1;
690 req->r_pages = pages;
691 req->r_num_pages = num_pages;
692 req->r_inode = inode;
694 ret = ceph_osdc_start_request(&client->osdc, req, false);
696 if (req->r_safe_callback) {
698 * Add to inode unsafe list only after we
699 * start_request so that a tid has been assigned.
701 spin_lock(&ci->i_unsafe_lock);
702 list_add(&ci->i_unsafe_writes, &req->r_unsafe_item);
703 spin_unlock(&ci->i_unsafe_lock);
704 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
706 ret = ceph_osdc_wait_request(&client->osdc, req);
709 if (file->f_flags & O_DIRECT)
710 put_page_vector(pages, num_pages);
711 else if (file->f_flags & O_SYNC)
712 ceph_release_page_vector(pages, num_pages);
715 ceph_osdc_put_request(req);
725 if (pos > i_size_read(inode))
726 check_caps = ceph_inode_set_size(inode, pos);
728 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
735 * Wrap generic_file_aio_read with checks for cap bits on the inode.
736 * Atomically grab references, so that those bits are not released
737 * back to the MDS mid-read.
739 * Hmm, the sync read case isn't actually async... should it be?
741 static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
742 unsigned long nr_segs, loff_t pos)
744 struct file *filp = iocb->ki_filp;
745 loff_t *ppos = &iocb->ki_pos;
746 size_t len = iov->iov_len;
747 struct inode *inode = filp->f_dentry->d_inode;
748 struct ceph_inode_info *ci = ceph_inode(inode);
752 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
753 inode, ceph_vinop(inode), pos, (unsigned)len, inode);
754 __ceph_do_pending_vmtruncate(inode);
755 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_CACHE,
759 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
760 inode, ceph_vinop(inode), pos, (unsigned)len,
761 ceph_cap_string(got));
763 if ((got & CEPH_CAP_FILE_CACHE) == 0 ||
764 (iocb->ki_filp->f_flags & O_DIRECT) ||
765 (inode->i_sb->s_flags & MS_SYNCHRONOUS))
766 /* hmm, this isn't really async... */
767 ret = ceph_sync_read(filp, iov->iov_base, len, ppos);
769 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
772 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
773 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
774 ceph_put_cap_refs(ci, got);
779 * Take cap references to avoid releasing caps to MDS mid-write.
781 * If we are synchronous, and write with an old snap context, the OSD
782 * may return EOLDSNAPC. In that case, retry the write.. _after_
783 * dropping our cap refs and allowing the pending snap to logically
784 * complete _before_ this write occurs.
786 * If we are near ENOSPC, write synchronously.
788 static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
789 unsigned long nr_segs, loff_t pos)
791 struct file *file = iocb->ki_filp;
792 struct inode *inode = file->f_dentry->d_inode;
793 struct ceph_inode_info *ci = ceph_inode(inode);
794 struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
795 loff_t endoff = pos + iov->iov_len;
799 if (ceph_snap(inode) != CEPH_NOSNAP)
803 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
805 __ceph_do_pending_vmtruncate(inode);
806 dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
807 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
809 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
814 dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
815 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
816 ceph_cap_string(got));
818 if ((got & CEPH_CAP_FILE_BUFFER) == 0 ||
819 (iocb->ki_filp->f_flags & O_DIRECT) ||
820 (inode->i_sb->s_flags & MS_SYNCHRONOUS)) {
821 ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
824 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
826 if ((ret >= 0 || ret == -EIOCBQUEUED) &&
827 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
828 || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL)))
829 ret = vfs_fsync_range(file, file->f_path.dentry,
830 pos, pos + ret - 1, 1);
833 spin_lock(&inode->i_lock);
834 __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
835 spin_unlock(&inode->i_lock);
839 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
840 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
841 ceph_cap_string(got));
842 ceph_put_cap_refs(ci, got);
844 if (ret == -EOLDSNAPC) {
845 dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
846 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
854 * llseek. be sure to verify file size on SEEK_END.
856 static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
858 struct inode *inode = file->f_mapping->host;
861 mutex_lock(&inode->i_mutex);
862 __ceph_do_pending_vmtruncate(inode);
865 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
870 offset += inode->i_size;
874 * Here we special-case the lseek(fd, 0, SEEK_CUR)
875 * position-querying operation. Avoid rewriting the "same"
876 * f_pos value back to the file because a concurrent read(),
877 * write() or lseek() might have altered it
880 offset = file->f_pos;
883 offset += file->f_pos;
887 if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
892 /* Special lock needed here? */
893 if (offset != file->f_pos) {
894 file->f_pos = offset;
899 mutex_unlock(&inode->i_mutex);
903 const struct file_operations ceph_file_fops = {
905 .release = ceph_release,
906 .llseek = ceph_llseek,
907 .read = do_sync_read,
908 .write = do_sync_write,
909 .aio_read = ceph_aio_read,
910 .aio_write = ceph_aio_write,
913 .splice_read = generic_file_splice_read,
914 .splice_write = generic_file_splice_write,
915 .unlocked_ioctl = ceph_ioctl,
916 .compat_ioctl = ceph_ioctl,