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);
266 /* wake up anyone waiting for caps on this inode */
267 wake_up(&ci->i_cap_wq);
272 * build a vector of user pages
274 static struct page **get_direct_page_vector(const char __user *data,
276 loff_t off, size_t len)
281 pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS);
283 return ERR_PTR(-ENOMEM);
285 down_read(¤t->mm->mmap_sem);
286 rc = get_user_pages(current, current->mm, (unsigned long)data,
287 num_pages, 0, 0, pages, NULL);
288 up_read(¤t->mm->mmap_sem);
298 static void put_page_vector(struct page **pages, int num_pages)
302 for (i = 0; i < num_pages; i++)
307 void ceph_release_page_vector(struct page **pages, int num_pages)
311 for (i = 0; i < num_pages; i++)
312 __free_pages(pages[i], 0);
317 * allocate a vector new pages
319 static struct page **alloc_page_vector(int num_pages)
324 pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS);
326 return ERR_PTR(-ENOMEM);
327 for (i = 0; i < num_pages; i++) {
328 pages[i] = alloc_page(GFP_NOFS);
329 if (pages[i] == NULL) {
330 ceph_release_page_vector(pages, i);
331 return ERR_PTR(-ENOMEM);
338 * copy user data into a page vector
340 static int copy_user_to_page_vector(struct page **pages,
341 const char __user *data,
342 loff_t off, size_t len)
345 int po = off & ~PAGE_CACHE_MASK;
350 l = min_t(int, PAGE_CACHE_SIZE-po, left);
351 bad = copy_from_user(page_address(pages[i]) + po, data, l);
357 if (po == PAGE_CACHE_SIZE) {
366 * copy user data from a page vector into a user pointer
368 static int copy_page_vector_to_user(struct page **pages, char __user *data,
369 loff_t off, size_t len)
372 int po = off & ~PAGE_CACHE_MASK;
377 l = min_t(int, left, PAGE_CACHE_SIZE-po);
378 bad = copy_to_user(data, page_address(pages[i]) + po, l);
385 if (po == PAGE_CACHE_SIZE)
394 * Zero an extent within a page vector. Offset is relative to the
395 * start of the first page.
397 static void zero_page_vector_range(int off, int len, struct page **pages)
399 int i = off >> PAGE_CACHE_SHIFT;
401 off &= ~PAGE_CACHE_MASK;
403 dout("zero_page_vector_page %u~%u\n", off, len);
405 /* leading partial page? */
407 int end = min((int)PAGE_CACHE_SIZE, off + len);
408 dout("zeroing %d %p head from %d\n", i, pages[i],
410 zero_user_segment(pages[i], off, end);
414 while (len >= PAGE_CACHE_SIZE) {
415 dout("zeroing %d %p len=%d\n", i, pages[i], len);
416 zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
417 len -= PAGE_CACHE_SIZE;
420 /* trailing partial page? */
422 dout("zeroing %d %p tail to %d\n", i, pages[i], (int)len);
423 zero_user_segment(pages[i], 0, len);
429 * Read a range of bytes striped over one or more objects. Iterate over
430 * objects we stripe over. (That's not atomic, but good enough for now.)
432 * If we get a short result from the OSD, check against i_size; we need to
433 * only return a short read to the caller if we hit EOF.
435 static int striped_read(struct inode *inode,
437 struct page **pages, int num_pages,
440 struct ceph_client *client = ceph_inode_to_client(inode);
441 struct ceph_inode_info *ci = ceph_inode(inode);
443 int page_off = off & ~PAGE_CACHE_MASK; /* first byte's offset in page */
444 int left, pages_left;
446 struct page **page_pos;
448 bool hit_stripe, was_short;
451 * we may need to do multiple reads. not atomic, unfortunately.
456 pages_left = num_pages;
461 ret = ceph_osdc_readpages(&client->osdc, ceph_vino(inode),
462 &ci->i_layout, pos, &this_len,
465 page_pos, pages_left);
466 hit_stripe = this_len < left;
467 was_short = ret >= 0 && ret < this_len;
470 dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
471 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
475 ((pos & ~PAGE_CACHE_MASK) + ret) >> PAGE_CACHE_SHIFT;
477 if (read < pos - off) {
478 dout(" zero gap %llu to %llu\n", off + read, pos);
479 zero_page_vector_range(page_off + read,
480 pos - off - read, pages);
485 page_pos += didpages;
486 pages_left -= didpages;
489 if (left && hit_stripe)
494 /* was original extent fully inside i_size? */
495 if (pos + left <= inode->i_size) {
497 zero_page_vector_range(page_off + read, len - read,
510 dout("striped_read returns %d\n", ret);
515 * Completely synchronous read and write methods. Direct from __user
516 * buffer to osd, or directly to user pages (if O_DIRECT).
518 * If the read spans object boundary, just do multiple reads.
520 static ssize_t ceph_sync_read(struct file *file, char __user *data,
521 unsigned len, loff_t *poff, int *checkeof)
523 struct inode *inode = file->f_dentry->d_inode;
526 int num_pages = calc_pages_for(off, len);
529 dout("sync_read on file %p %llu~%u %s\n", file, off, len,
530 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
532 if (file->f_flags & O_DIRECT) {
533 pages = get_direct_page_vector(data, num_pages, off, len);
536 * flush any page cache pages in this range. this
537 * will make concurrent normal and O_DIRECT io slow,
538 * but it will at least behave sensibly when they are
542 pages = alloc_page_vector(num_pages);
545 return PTR_ERR(pages);
547 ret = filemap_write_and_wait(inode->i_mapping);
551 ret = striped_read(inode, off, len, pages, num_pages, checkeof);
553 if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
554 ret = copy_page_vector_to_user(pages, data, off, ret);
559 if (file->f_flags & O_DIRECT)
560 put_page_vector(pages, num_pages);
562 ceph_release_page_vector(pages, num_pages);
563 dout("sync_read result %d\n", ret);
568 * Write commit callback, called if we requested both an ACK and
569 * ONDISK commit reply from the OSD.
571 static void sync_write_commit(struct ceph_osd_request *req,
572 struct ceph_msg *msg)
574 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
576 dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
577 spin_lock(&ci->i_unsafe_lock);
578 list_del_init(&req->r_unsafe_item);
579 spin_unlock(&ci->i_unsafe_lock);
580 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
584 * Synchronous write, straight from __user pointer or user pages (if
587 * If write spans object boundary, just do multiple writes. (For a
588 * correct atomic write, we should e.g. take write locks on all
589 * objects, rollback on failure, etc.)
591 static ssize_t ceph_sync_write(struct file *file, const char __user *data,
592 size_t left, loff_t *offset)
594 struct inode *inode = file->f_dentry->d_inode;
595 struct ceph_inode_info *ci = ceph_inode(inode);
596 struct ceph_client *client = ceph_inode_to_client(inode);
597 struct ceph_osd_request *req;
600 long long unsigned pos;
607 struct timespec mtime = CURRENT_TIME;
609 if (ceph_snap(file->f_dentry->d_inode) != CEPH_NOSNAP)
612 dout("sync_write on file %p %lld~%u %s\n", file, *offset,
613 (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
615 if (file->f_flags & O_APPEND)
616 pos = i_size_read(inode);
620 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
624 ret = invalidate_inode_pages2_range(inode->i_mapping,
625 pos >> PAGE_CACHE_SHIFT,
626 (pos + left) >> PAGE_CACHE_SHIFT);
628 dout("invalidate_inode_pages2_range returned %d\n", ret);
630 flags = CEPH_OSD_FLAG_ORDERSNAP |
631 CEPH_OSD_FLAG_ONDISK |
633 if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
634 flags |= CEPH_OSD_FLAG_ACK;
639 * we may need to do multiple writes here if we span an object
640 * boundary. this isn't atomic, unfortunately. :(
644 req = ceph_osdc_new_request(&client->osdc, &ci->i_layout,
645 ceph_vino(inode), pos, &len,
646 CEPH_OSD_OP_WRITE, flags,
647 ci->i_snap_realm->cached_context,
649 ci->i_truncate_seq, ci->i_truncate_size,
654 num_pages = calc_pages_for(pos, len);
656 if (file->f_flags & O_DIRECT) {
657 pages = get_direct_page_vector(data, num_pages, pos, len);
659 ret = PTR_ERR(pages);
664 * throw out any page cache pages in this range. this
667 truncate_inode_pages_range(inode->i_mapping, pos, pos+len);
669 pages = alloc_page_vector(num_pages);
671 ret = PTR_ERR(pages);
674 ret = copy_user_to_page_vector(pages, data, pos, len);
676 ceph_release_page_vector(pages, num_pages);
680 if ((file->f_flags & O_SYNC) == 0) {
681 /* get a second commit callback */
682 req->r_safe_callback = sync_write_commit;
683 req->r_own_pages = 1;
686 req->r_pages = pages;
687 req->r_num_pages = num_pages;
688 req->r_inode = inode;
690 ret = ceph_osdc_start_request(&client->osdc, req, false);
692 if (req->r_safe_callback) {
694 * Add to inode unsafe list only after we
695 * start_request so that a tid has been assigned.
697 spin_lock(&ci->i_unsafe_lock);
698 list_add(&ci->i_unsafe_writes, &req->r_unsafe_item);
699 spin_unlock(&ci->i_unsafe_lock);
700 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
702 ret = ceph_osdc_wait_request(&client->osdc, req);
705 if (file->f_flags & O_DIRECT)
706 put_page_vector(pages, num_pages);
707 else if (file->f_flags & O_SYNC)
708 ceph_release_page_vector(pages, num_pages);
711 ceph_osdc_put_request(req);
721 if (pos > i_size_read(inode))
722 check_caps = ceph_inode_set_size(inode, pos);
724 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
731 * Wrap generic_file_aio_read with checks for cap bits on the inode.
732 * Atomically grab references, so that those bits are not released
733 * back to the MDS mid-read.
735 * Hmm, the sync read case isn't actually async... should it be?
737 static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
738 unsigned long nr_segs, loff_t pos)
740 struct file *filp = iocb->ki_filp;
741 loff_t *ppos = &iocb->ki_pos;
742 size_t len = iov->iov_len;
743 struct inode *inode = filp->f_dentry->d_inode;
744 struct ceph_inode_info *ci = ceph_inode(inode);
745 void *base = iov->iov_base;
748 int checkeof = 0, read = 0;
750 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
751 inode, ceph_vinop(inode), pos, (unsigned)len, inode);
753 __ceph_do_pending_vmtruncate(inode);
754 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_CACHE,
758 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
759 inode, ceph_vinop(inode), pos, (unsigned)len,
760 ceph_cap_string(got));
762 if ((got & CEPH_CAP_FILE_CACHE) == 0 ||
763 (iocb->ki_filp->f_flags & O_DIRECT) ||
764 (inode->i_sb->s_flags & MS_SYNCHRONOUS))
765 /* hmm, this isn't really async... */
766 ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
768 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
771 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
772 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
773 ceph_put_cap_refs(ci, got);
775 if (checkeof && ret >= 0) {
776 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
778 /* hit EOF or hole? */
779 if (statret == 0 && *ppos < inode->i_size) {
780 dout("aio_read sync_read hit hole, reading more\n");
795 * Take cap references to avoid releasing caps to MDS mid-write.
797 * If we are synchronous, and write with an old snap context, the OSD
798 * may return EOLDSNAPC. In that case, retry the write.. _after_
799 * dropping our cap refs and allowing the pending snap to logically
800 * complete _before_ this write occurs.
802 * If we are near ENOSPC, write synchronously.
804 static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
805 unsigned long nr_segs, loff_t pos)
807 struct file *file = iocb->ki_filp;
808 struct inode *inode = file->f_dentry->d_inode;
809 struct ceph_inode_info *ci = ceph_inode(inode);
810 struct ceph_osd_client *osdc = &ceph_client(inode->i_sb)->osdc;
811 loff_t endoff = pos + iov->iov_len;
815 if (ceph_snap(inode) != CEPH_NOSNAP)
819 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
821 __ceph_do_pending_vmtruncate(inode);
822 dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
823 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
825 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
830 dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
831 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
832 ceph_cap_string(got));
834 if ((got & CEPH_CAP_FILE_BUFFER) == 0 ||
835 (iocb->ki_filp->f_flags & O_DIRECT) ||
836 (inode->i_sb->s_flags & MS_SYNCHRONOUS)) {
837 ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
840 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
842 if ((ret >= 0 || ret == -EIOCBQUEUED) &&
843 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
844 || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
845 err = vfs_fsync_range(file, file->f_path.dentry,
846 pos, pos + ret - 1, 1);
852 spin_lock(&inode->i_lock);
853 __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
854 spin_unlock(&inode->i_lock);
858 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
859 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
860 ceph_cap_string(got));
861 ceph_put_cap_refs(ci, got);
863 if (ret == -EOLDSNAPC) {
864 dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
865 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
873 * llseek. be sure to verify file size on SEEK_END.
875 static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
877 struct inode *inode = file->f_mapping->host;
880 mutex_lock(&inode->i_mutex);
881 __ceph_do_pending_vmtruncate(inode);
884 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
889 offset += inode->i_size;
893 * Here we special-case the lseek(fd, 0, SEEK_CUR)
894 * position-querying operation. Avoid rewriting the "same"
895 * f_pos value back to the file because a concurrent read(),
896 * write() or lseek() might have altered it
899 offset = file->f_pos;
902 offset += file->f_pos;
906 if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
911 /* Special lock needed here? */
912 if (offset != file->f_pos) {
913 file->f_pos = offset;
918 mutex_unlock(&inode->i_mutex);
922 const struct file_operations ceph_file_fops = {
924 .release = ceph_release,
925 .llseek = ceph_llseek,
926 .read = do_sync_read,
927 .write = do_sync_write,
928 .aio_read = ceph_aio_read,
929 .aio_write = ceph_aio_write,
932 .splice_read = generic_file_splice_read,
933 .splice_write = generic_file_splice_write,
934 .unlocked_ioctl = ceph_ioctl,
935 .compat_ioctl = ceph_ioctl,