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/namei.h>
8 #include <linux/writeback.h>
11 #include "mds_client.h"
14 * Ceph file operations
16 * Implement basic open/close functionality, and implement
19 * We implement three modes of file I/O:
20 * - buffered uses the generic_file_aio_{read,write} helpers
22 * - synchronous is used when there is multi-client read/write
23 * sharing, avoids the page cache, and synchronously waits for an
26 * - direct io takes the variant of the sync path that references
27 * user pages directly.
29 * fsync() flushes and waits on dirty pages, but just queues metadata
30 * for writeback: since the MDS can recover size and mtime there is no
31 * need to wait for MDS acknowledgement.
36 * Prepare an open request. Preallocate ceph_cap to avoid an
37 * inopportune ENOMEM later.
39 static struct ceph_mds_request *
40 prepare_open_request(struct super_block *sb, int flags, int create_mode)
42 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
43 struct ceph_mds_client *mdsc = fsc->mdsc;
44 struct ceph_mds_request *req;
45 int want_auth = USE_ANY_MDS;
46 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
48 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
49 want_auth = USE_AUTH_MDS;
51 req = ceph_mdsc_create_request(mdsc, op, want_auth);
54 req->r_fmode = ceph_flags_to_mode(flags);
55 req->r_args.open.flags = cpu_to_le32(flags);
56 req->r_args.open.mode = cpu_to_le32(create_mode);
62 * initialize private struct file data.
63 * if we fail, clean up by dropping fmode reference on the ceph_inode
65 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
67 struct ceph_file_info *cf;
70 switch (inode->i_mode & S_IFMT) {
73 dout("init_file %p %p 0%o (regular)\n", inode, file,
75 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
77 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
82 file->private_data = cf;
83 BUG_ON(inode->i_fop->release != ceph_release);
87 dout("init_file %p %p 0%o (symlink)\n", inode, file,
89 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
93 dout("init_file %p %p 0%o (special)\n", inode, file,
96 * we need to drop the open ref now, since we don't
97 * have .release set to ceph_release.
99 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
100 BUG_ON(inode->i_fop->release == ceph_release);
102 /* call the proper open fop */
103 ret = inode->i_fop->open(inode, file);
109 * If the filp already has private_data, that means the file was
110 * already opened by intent during lookup, and we do nothing.
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.
212 * If this succeeds, but some subsequent check in the vfs
213 * may_open() fails, the struct *file gets cleaned up (i.e.
214 * ceph_release gets called). So fear not!
216 int ceph_lookup_open(struct inode *dir, struct dentry *dentry,
217 struct file *file, unsigned flags, umode_t mode,
220 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
221 struct ceph_mds_client *mdsc = fsc->mdsc;
222 struct ceph_mds_request *req;
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);
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,
241 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
243 err = ceph_handle_snapdir(req, dentry, err);
246 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
247 err = ceph_handle_notrace_create(dir, dentry);
250 err = finish_open(file, req->r_dentry, ceph_open, opened);
252 ret = ceph_finish_lookup(req, dentry, err);
253 ceph_mdsc_put_request(req);
254 dout("ceph_lookup_open result=%p\n", ret);
263 int ceph_release(struct inode *inode, struct file *file)
265 struct ceph_inode_info *ci = ceph_inode(inode);
266 struct ceph_file_info *cf = file->private_data;
268 dout("release inode %p file %p\n", inode, file);
269 ceph_put_fmode(ci, cf->fmode);
270 if (cf->last_readdir)
271 ceph_mdsc_put_request(cf->last_readdir);
272 kfree(cf->last_name);
275 kmem_cache_free(ceph_file_cachep, cf);
277 /* wake up anyone waiting for caps on this inode */
278 wake_up_all(&ci->i_cap_wq);
283 * Read a range of bytes striped over one or more objects. Iterate over
284 * objects we stripe over. (That's not atomic, but good enough for now.)
286 * If we get a short result from the OSD, check against i_size; we need to
287 * only return a short read to the caller if we hit EOF.
289 static int striped_read(struct inode *inode,
291 struct page **pages, int num_pages,
292 int *checkeof, bool o_direct,
293 unsigned long buf_align)
295 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
296 struct ceph_inode_info *ci = ceph_inode(inode);
298 int io_align, page_align;
299 int left, pages_left;
301 struct page **page_pos;
303 bool hit_stripe, was_short;
306 * we may need to do multiple reads. not atomic, unfortunately.
311 pages_left = num_pages;
313 io_align = off & ~PAGE_MASK;
317 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
319 page_align = pos & ~PAGE_MASK;
321 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
322 &ci->i_layout, pos, &this_len,
325 page_pos, pages_left, page_align);
328 hit_stripe = this_len < left;
329 was_short = ret >= 0 && ret < this_len;
330 dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
331 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
334 int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
336 if (read < pos - off) {
337 dout(" zero gap %llu to %llu\n", off + read, pos);
338 ceph_zero_page_vector_range(page_align + read,
339 pos - off - read, pages);
344 page_pos += didpages;
345 pages_left -= didpages;
348 if (left && hit_stripe)
353 /* did we bounce off eof? */
354 if (pos + left > inode->i_size)
357 /* zero trailing bytes (inside i_size) */
358 if (left > 0 && pos < inode->i_size) {
359 if (pos + left > inode->i_size)
360 left = inode->i_size - pos;
362 dout("zero tail %d\n", left);
363 ceph_zero_page_vector_range(page_align + read, left,
371 dout("striped_read returns %d\n", ret);
376 * Completely synchronous read and write methods. Direct from __user
377 * buffer to osd, or directly to user pages (if O_DIRECT).
379 * If the read spans object boundary, just do multiple reads.
381 static ssize_t ceph_sync_read(struct file *file, char __user *data,
382 unsigned len, loff_t *poff, int *checkeof)
384 struct inode *inode = file->f_dentry->d_inode;
389 dout("sync_read on file %p %llu~%u %s\n", file, off, len,
390 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
392 if (file->f_flags & O_DIRECT) {
393 num_pages = calc_pages_for((unsigned long)data, len);
394 pages = ceph_get_direct_page_vector(data, num_pages, true);
396 num_pages = calc_pages_for(off, len);
397 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
400 return PTR_ERR(pages);
403 * flush any page cache pages in this range. this
404 * will make concurrent normal and sync io slow,
405 * but it will at least behave sensibly when they are
408 ret = filemap_write_and_wait(inode->i_mapping);
412 ret = striped_read(inode, off, len, pages, num_pages, checkeof,
413 file->f_flags & O_DIRECT,
414 (unsigned long)data & ~PAGE_MASK);
416 if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
417 ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
422 if (file->f_flags & O_DIRECT)
423 ceph_put_page_vector(pages, num_pages, true);
425 ceph_release_page_vector(pages, num_pages);
426 dout("sync_read result %d\n", ret);
431 * Write commit callback, called if we requested both an ACK and
432 * ONDISK commit reply from the OSD.
434 static void sync_write_commit(struct ceph_osd_request *req,
435 struct ceph_msg *msg)
437 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
439 dout("sync_write_commit %p tid %llu\n", req, req->r_tid);
440 spin_lock(&ci->i_unsafe_lock);
441 list_del_init(&req->r_unsafe_item);
442 spin_unlock(&ci->i_unsafe_lock);
443 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
447 * Synchronous write, straight from __user pointer or user pages (if
450 * If write spans object boundary, just do multiple writes. (For a
451 * correct atomic write, we should e.g. take write locks on all
452 * objects, rollback on failure, etc.)
454 static ssize_t ceph_sync_write(struct file *file, const char __user *data,
455 size_t left, loff_t *offset)
457 struct inode *inode = file->f_dentry->d_inode;
458 struct ceph_inode_info *ci = ceph_inode(inode);
459 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
460 struct ceph_osd_request *req;
463 long long unsigned pos;
469 int page_align, io_align;
470 unsigned long buf_align;
472 struct timespec mtime = CURRENT_TIME;
474 if (ceph_snap(file->f_dentry->d_inode) != CEPH_NOSNAP)
477 dout("sync_write on file %p %lld~%u %s\n", file, *offset,
478 (unsigned)left, (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
480 if (file->f_flags & O_APPEND)
481 pos = i_size_read(inode);
485 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
489 ret = invalidate_inode_pages2_range(inode->i_mapping,
490 pos >> PAGE_CACHE_SHIFT,
491 (pos + left) >> PAGE_CACHE_SHIFT);
493 dout("invalidate_inode_pages2_range returned %d\n", ret);
495 flags = CEPH_OSD_FLAG_ORDERSNAP |
496 CEPH_OSD_FLAG_ONDISK |
498 if ((file->f_flags & (O_SYNC|O_DIRECT)) == 0)
499 flags |= CEPH_OSD_FLAG_ACK;
504 * we may need to do multiple writes here if we span an object
505 * boundary. this isn't atomic, unfortunately. :(
508 io_align = pos & ~PAGE_MASK;
509 buf_align = (unsigned long)data & ~PAGE_MASK;
511 if (file->f_flags & O_DIRECT) {
512 /* write from beginning of first page, regardless of
514 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
515 num_pages = calc_pages_for((unsigned long)data, len);
517 page_align = pos & ~PAGE_MASK;
518 num_pages = calc_pages_for(pos, len);
520 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
521 ceph_vino(inode), pos, &len,
522 CEPH_OSD_OP_WRITE, flags,
523 ci->i_snap_realm->cached_context,
525 ci->i_truncate_seq, ci->i_truncate_size,
526 &mtime, false, 2, page_align);
530 if (file->f_flags & O_DIRECT) {
531 pages = ceph_get_direct_page_vector(data, num_pages, false);
533 ret = PTR_ERR(pages);
538 * throw out any page cache pages in this range. this
541 truncate_inode_pages_range(inode->i_mapping, pos,
542 (pos+len) | (PAGE_CACHE_SIZE-1));
544 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
546 ret = PTR_ERR(pages);
549 ret = ceph_copy_user_to_page_vector(pages, data, pos, len);
551 ceph_release_page_vector(pages, num_pages);
555 if ((file->f_flags & O_SYNC) == 0) {
556 /* get a second commit callback */
557 req->r_safe_callback = sync_write_commit;
558 req->r_own_pages = 1;
561 req->r_pages = pages;
562 req->r_num_pages = num_pages;
563 req->r_inode = inode;
565 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
567 if (req->r_safe_callback) {
569 * Add to inode unsafe list only after we
570 * start_request so that a tid has been assigned.
572 spin_lock(&ci->i_unsafe_lock);
573 list_add_tail(&req->r_unsafe_item,
574 &ci->i_unsafe_writes);
575 spin_unlock(&ci->i_unsafe_lock);
576 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
579 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
580 if (ret < 0 && req->r_safe_callback) {
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 if (file->f_flags & O_DIRECT)
589 ceph_put_page_vector(pages, num_pages, false);
590 else if (file->f_flags & O_SYNC)
591 ceph_release_page_vector(pages, num_pages);
594 ceph_osdc_put_request(req);
605 if (pos > i_size_read(inode))
606 check_caps = ceph_inode_set_size(inode, pos);
608 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
615 * Wrap generic_file_aio_read with checks for cap bits on the inode.
616 * Atomically grab references, so that those bits are not released
617 * back to the MDS mid-read.
619 * Hmm, the sync read case isn't actually async... should it be?
621 static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
622 unsigned long nr_segs, loff_t pos)
624 struct file *filp = iocb->ki_filp;
625 struct ceph_file_info *fi = filp->private_data;
626 loff_t *ppos = &iocb->ki_pos;
627 size_t len = iov->iov_len;
628 struct inode *inode = filp->f_dentry->d_inode;
629 struct ceph_inode_info *ci = ceph_inode(inode);
630 void __user *base = iov->iov_base;
633 int checkeof = 0, read = 0;
635 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
636 inode, ceph_vinop(inode), pos, (unsigned)len, inode);
638 __ceph_do_pending_vmtruncate(inode);
639 if (fi->fmode & CEPH_FILE_MODE_LAZY)
640 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
642 want = CEPH_CAP_FILE_CACHE;
643 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
646 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
647 inode, ceph_vinop(inode), pos, (unsigned)len,
648 ceph_cap_string(got));
650 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
651 (iocb->ki_filp->f_flags & O_DIRECT) ||
652 (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
653 (fi->flags & CEPH_F_SYNC))
654 /* hmm, this isn't really async... */
655 ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
657 ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
660 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
661 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
662 ceph_put_cap_refs(ci, got);
664 if (checkeof && ret >= 0) {
665 int statret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
667 /* hit EOF or hole? */
668 if (statret == 0 && *ppos < inode->i_size) {
669 dout("aio_read sync_read hit hole, ppos %lld < size %lld, reading more\n", *ppos, inode->i_size);
684 * Take cap references to avoid releasing caps to MDS mid-write.
686 * If we are synchronous, and write with an old snap context, the OSD
687 * may return EOLDSNAPC. In that case, retry the write.. _after_
688 * dropping our cap refs and allowing the pending snap to logically
689 * complete _before_ this write occurs.
691 * If we are near ENOSPC, write synchronously.
693 static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
694 unsigned long nr_segs, loff_t pos)
696 struct file *file = iocb->ki_filp;
697 struct ceph_file_info *fi = file->private_data;
698 struct inode *inode = file->f_dentry->d_inode;
699 struct ceph_inode_info *ci = ceph_inode(inode);
700 struct ceph_osd_client *osdc =
701 &ceph_sb_to_client(inode->i_sb)->client->osdc;
702 loff_t endoff = pos + iov->iov_len;
706 if (ceph_snap(inode) != CEPH_NOSNAP)
710 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
712 __ceph_do_pending_vmtruncate(inode);
713 dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
714 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
716 if (fi->fmode & CEPH_FILE_MODE_LAZY)
717 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
719 want = CEPH_CAP_FILE_BUFFER;
720 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
724 dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
725 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
726 ceph_cap_string(got));
728 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
729 (iocb->ki_filp->f_flags & O_DIRECT) ||
730 (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
731 (fi->flags & CEPH_F_SYNC)) {
732 ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
736 * buffered write; drop Fw early to avoid slow
737 * revocation if we get stuck on balance_dirty_pages
741 spin_lock(&ci->i_ceph_lock);
742 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
743 spin_unlock(&ci->i_ceph_lock);
744 ceph_put_cap_refs(ci, got);
746 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
747 if ((ret >= 0 || ret == -EIOCBQUEUED) &&
748 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
749 || ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
750 err = vfs_fsync_range(file, pos, pos + ret - 1, 1);
756 __mark_inode_dirty(inode, dirty);
762 spin_lock(&ci->i_ceph_lock);
763 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
764 spin_unlock(&ci->i_ceph_lock);
766 __mark_inode_dirty(inode, dirty);
770 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
771 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
772 ceph_cap_string(got));
773 ceph_put_cap_refs(ci, got);
776 if (ret == -EOLDSNAPC) {
777 dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
778 inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
786 * llseek. be sure to verify file size on SEEK_END.
788 static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
790 struct inode *inode = file->f_mapping->host;
793 mutex_lock(&inode->i_mutex);
794 __ceph_do_pending_vmtruncate(inode);
796 if (origin == SEEK_END || origin == SEEK_DATA || origin == SEEK_HOLE) {
797 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
806 offset += inode->i_size;
810 * Here we special-case the lseek(fd, 0, SEEK_CUR)
811 * position-querying operation. Avoid rewriting the "same"
812 * f_pos value back to the file because a concurrent read(),
813 * write() or lseek() might have altered it
816 offset = file->f_pos;
819 offset += file->f_pos;
822 if (offset >= inode->i_size) {
828 if (offset >= inode->i_size) {
832 offset = inode->i_size;
836 if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
841 /* Special lock needed here? */
842 if (offset != file->f_pos) {
843 file->f_pos = offset;
848 mutex_unlock(&inode->i_mutex);
852 const struct file_operations ceph_file_fops = {
854 .release = ceph_release,
855 .llseek = ceph_llseek,
856 .read = do_sync_read,
857 .write = do_sync_write,
858 .aio_read = ceph_aio_read,
859 .aio_write = ceph_aio_write,
864 .splice_read = generic_file_splice_read,
865 .splice_write = generic_file_splice_write,
866 .unlocked_ioctl = ceph_ioctl,
867 .compat_ioctl = ceph_ioctl,