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/falloc.h>
13 #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;
72 struct ceph_inode_info *ci = ceph_inode(inode);
73 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
74 struct ceph_mds_client *mdsc = fsc->mdsc;
76 switch (inode->i_mode & S_IFMT) {
78 /* First file open request creates the cookie, we want to keep
79 * this cookie around for the filetime of the inode as not to
80 * have to worry about fscache register / revoke / operation
83 * Also, if we know the operation is going to invalidate data
84 * (non readonly) just nuke the cache right away.
86 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
87 if ((fmode & CEPH_FILE_MODE_WR))
88 ceph_fscache_invalidate(inode);
90 dout("init_file %p %p 0%o (regular)\n", inode, file,
92 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
94 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
99 file->private_data = cf;
100 BUG_ON(inode->i_fop->release != ceph_release);
104 dout("init_file %p %p 0%o (symlink)\n", inode, file,
106 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
110 dout("init_file %p %p 0%o (special)\n", inode, file,
113 * we need to drop the open ref now, since we don't
114 * have .release set to ceph_release.
116 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
117 BUG_ON(inode->i_fop->release == ceph_release);
119 /* call the proper open fop */
120 ret = inode->i_fop->open(inode, file);
126 * If we already have the requisite capabilities, we can satisfy
127 * the open request locally (no need to request new caps from the
128 * MDS). We do, however, need to inform the MDS (asynchronously)
129 * if our wanted caps set expands.
131 int ceph_open(struct inode *inode, struct file *file)
133 struct ceph_inode_info *ci = ceph_inode(inode);
134 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
135 struct ceph_mds_client *mdsc = fsc->mdsc;
136 struct ceph_mds_request *req;
137 struct ceph_file_info *cf = file->private_data;
138 struct inode *parent_inode = NULL;
140 int flags, fmode, wanted;
143 dout("open file %p is already opened\n", file);
147 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
148 flags = file->f_flags & ~(O_CREAT|O_EXCL);
149 if (S_ISDIR(inode->i_mode))
150 flags = O_DIRECTORY; /* mds likes to know */
152 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
153 ceph_vinop(inode), file, flags, file->f_flags);
154 fmode = ceph_flags_to_mode(flags);
155 wanted = ceph_caps_for_mode(fmode);
157 /* snapped files are read-only */
158 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
161 /* trivially open snapdir */
162 if (ceph_snap(inode) == CEPH_SNAPDIR) {
163 spin_lock(&ci->i_ceph_lock);
164 __ceph_get_fmode(ci, fmode);
165 spin_unlock(&ci->i_ceph_lock);
166 return ceph_init_file(inode, file, fmode);
170 * No need to block if we have caps on the auth MDS (for
171 * write) or any MDS (for read). Update wanted set
174 spin_lock(&ci->i_ceph_lock);
175 if (__ceph_is_any_real_caps(ci) &&
176 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
177 int mds_wanted = __ceph_caps_mds_wanted(ci);
178 int issued = __ceph_caps_issued(ci, NULL);
180 dout("open %p fmode %d want %s issued %s using existing\n",
181 inode, fmode, ceph_cap_string(wanted),
182 ceph_cap_string(issued));
183 __ceph_get_fmode(ci, fmode);
184 spin_unlock(&ci->i_ceph_lock);
187 if ((issued & wanted) != wanted &&
188 (mds_wanted & wanted) != wanted &&
189 ceph_snap(inode) != CEPH_SNAPDIR)
190 ceph_check_caps(ci, 0, NULL);
192 return ceph_init_file(inode, file, fmode);
193 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
194 (ci->i_snap_caps & wanted) == wanted) {
195 __ceph_get_fmode(ci, fmode);
196 spin_unlock(&ci->i_ceph_lock);
197 return ceph_init_file(inode, file, fmode);
200 spin_unlock(&ci->i_ceph_lock);
202 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
203 req = prepare_open_request(inode->i_sb, flags, 0);
208 req->r_inode = inode;
213 parent_inode = ceph_get_dentry_parent_inode(file->f_path.dentry);
214 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
217 err = ceph_init_file(inode, file, req->r_fmode);
218 ceph_mdsc_put_request(req);
219 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
226 * Do a lookup + open with a single request. If we get a non-existent
227 * file or symlink, return 1 so the VFS can retry.
229 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
230 struct file *file, unsigned flags, umode_t mode,
233 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
234 struct ceph_mds_client *mdsc = fsc->mdsc;
235 struct ceph_mds_request *req;
237 struct ceph_acls_info acls = {};
240 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
242 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
244 if (dentry->d_name.len > NAME_MAX)
245 return -ENAMETOOLONG;
247 err = ceph_init_dentry(dentry);
251 if (flags & O_CREAT) {
252 err = ceph_pre_init_acls(dir, &mode, &acls);
258 req = prepare_open_request(dir->i_sb, flags, mode);
263 req->r_dentry = dget(dentry);
265 if (flags & O_CREAT) {
266 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
267 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
269 req->r_pagelist = acls.pagelist;
270 acls.pagelist = NULL;
273 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
274 err = ceph_mdsc_do_request(mdsc,
275 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
277 err = ceph_handle_snapdir(req, dentry, err);
281 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
282 err = ceph_handle_notrace_create(dir, dentry);
284 if (d_unhashed(dentry)) {
285 dn = ceph_finish_lookup(req, dentry, err);
289 /* we were given a hashed negative dentry */
294 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
295 /* make vfs retry on splice, ENOENT, or symlink */
296 dout("atomic_open finish_no_open on dn %p\n", dn);
297 err = finish_no_open(file, dn);
299 dout("atomic_open finish_open on dn %p\n", dn);
300 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
301 ceph_init_inode_acls(d_inode(dentry), &acls);
302 *opened |= FILE_CREATED;
304 err = finish_open(file, dentry, ceph_open, opened);
307 if (!req->r_err && req->r_target_inode)
308 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
309 ceph_mdsc_put_request(req);
311 ceph_release_acls_info(&acls);
312 dout("atomic_open result=%d\n", err);
316 int ceph_release(struct inode *inode, struct file *file)
318 struct ceph_inode_info *ci = ceph_inode(inode);
319 struct ceph_file_info *cf = file->private_data;
321 dout("release inode %p file %p\n", inode, file);
322 ceph_put_fmode(ci, cf->fmode);
323 if (cf->last_readdir)
324 ceph_mdsc_put_request(cf->last_readdir);
325 kfree(cf->last_name);
328 kmem_cache_free(ceph_file_cachep, cf);
330 /* wake up anyone waiting for caps on this inode */
331 wake_up_all(&ci->i_cap_wq);
341 * Read a range of bytes striped over one or more objects. Iterate over
342 * objects we stripe over. (That's not atomic, but good enough for now.)
344 * If we get a short result from the OSD, check against i_size; we need to
345 * only return a short read to the caller if we hit EOF.
347 static int striped_read(struct inode *inode,
349 struct page **pages, int num_pages,
350 int *checkeof, bool o_direct,
351 unsigned long buf_align)
353 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
354 struct ceph_inode_info *ci = ceph_inode(inode);
355 u64 pos, this_len, left;
356 int io_align, page_align;
359 struct page **page_pos;
361 bool hit_stripe, was_short;
364 * we may need to do multiple reads. not atomic, unfortunately.
369 pages_left = num_pages;
371 io_align = off & ~PAGE_MASK;
375 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
377 page_align = pos & ~PAGE_MASK;
379 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
380 &ci->i_layout, pos, &this_len,
383 page_pos, pages_left, page_align);
386 hit_stripe = this_len < left;
387 was_short = ret >= 0 && ret < this_len;
388 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
389 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
393 if (was_short && (pos + ret < inode->i_size)) {
394 int zlen = min(this_len - ret,
395 inode->i_size - pos - ret);
396 int zoff = (o_direct ? buf_align : io_align) +
398 dout(" zero gap %llu to %llu\n",
399 pos + ret, pos + ret + zlen);
400 ceph_zero_page_vector_range(zoff, zlen, pages);
404 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
408 page_pos += didpages;
409 pages_left -= didpages;
411 /* hit stripe and need continue*/
412 if (left && hit_stripe && pos < inode->i_size)
418 /* did we bounce off eof? */
419 if (pos + left > inode->i_size)
420 *checkeof = CHECK_EOF;
423 dout("striped_read returns %d\n", ret);
428 * Completely synchronous read and write methods. Direct from __user
429 * buffer to osd, or directly to user pages (if O_DIRECT).
431 * If the read spans object boundary, just do multiple reads.
433 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
436 struct file *file = iocb->ki_filp;
437 struct inode *inode = file_inode(file);
439 u64 off = iocb->ki_pos;
441 size_t len = iov_iter_count(i);
443 dout("sync_read on file %p %llu~%u %s\n", file, off,
445 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
450 * flush any page cache pages in this range. this
451 * will make concurrent normal and sync io slow,
452 * but it will at least behave sensibly when they are
455 ret = filemap_write_and_wait_range(inode->i_mapping, off,
460 if (iocb->ki_flags & IOCB_DIRECT) {
461 while (iov_iter_count(i)) {
465 n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
469 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
471 ret = striped_read(inode, off, n,
472 pages, num_pages, checkeof,
475 ceph_put_page_vector(pages, num_pages, true);
480 iov_iter_advance(i, ret);
485 num_pages = calc_pages_for(off, len);
486 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
488 return PTR_ERR(pages);
489 ret = striped_read(inode, off, len, pages,
490 num_pages, checkeof, 0, 0);
496 size_t page_off = off & ~PAGE_MASK;
497 size_t copy = min_t(size_t,
498 PAGE_SIZE - page_off, left);
499 l = copy_page_to_iter(pages[k++], page_off,
507 ceph_release_page_vector(pages, num_pages);
510 if (off > iocb->ki_pos) {
511 ret = off - iocb->ki_pos;
515 dout("sync_read result %d\n", ret);
520 * Write commit request unsafe callback, called to tell us when a
521 * request is unsafe (that is, in flight--has been handed to the
522 * messenger to send to its target osd). It is called again when
523 * we've received a response message indicating the request is
524 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
525 * is completed early (and unsuccessfully) due to a timeout or
528 * This is used if we requested both an ACK and ONDISK commit reply
531 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
533 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
535 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
538 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
539 spin_lock(&ci->i_unsafe_lock);
540 list_add_tail(&req->r_unsafe_item,
541 &ci->i_unsafe_writes);
542 spin_unlock(&ci->i_unsafe_lock);
544 spin_lock(&ci->i_unsafe_lock);
545 list_del_init(&req->r_unsafe_item);
546 spin_unlock(&ci->i_unsafe_lock);
547 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
553 * Synchronous write, straight from __user pointer or user pages.
555 * If write spans object boundary, just do multiple writes. (For a
556 * correct atomic write, we should e.g. take write locks on all
557 * objects, rollback on failure, etc.)
560 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
562 struct file *file = iocb->ki_filp;
563 struct inode *inode = file_inode(file);
564 struct ceph_inode_info *ci = ceph_inode(inode);
565 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
566 struct ceph_snap_context *snapc;
567 struct ceph_vino vino;
568 struct ceph_osd_request *req;
575 struct timespec mtime = CURRENT_TIME;
576 size_t count = iov_iter_count(from);
578 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
581 dout("sync_direct_write on file %p %lld~%u\n", file, pos,
584 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
588 ret = invalidate_inode_pages2_range(inode->i_mapping,
589 pos >> PAGE_CACHE_SHIFT,
590 (pos + count) >> PAGE_CACHE_SHIFT);
592 dout("invalidate_inode_pages2_range returned %d\n", ret);
594 flags = CEPH_OSD_FLAG_ORDERSNAP |
595 CEPH_OSD_FLAG_ONDISK |
598 while (iov_iter_count(from) > 0) {
599 u64 len = iov_iter_single_seg_count(from);
603 snapc = ci->i_snap_realm->cached_context;
604 vino = ceph_vino(inode);
605 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
607 2,/*include a 'startsync' command*/
608 CEPH_OSD_OP_WRITE, flags, snapc,
617 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
619 n = iov_iter_get_pages_alloc(from, &pages, len, &start);
620 if (unlikely(n < 0)) {
622 ceph_osdc_put_request(req);
626 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
628 * throw out any page cache pages in this range. this
631 truncate_inode_pages_range(inode->i_mapping, pos,
632 (pos+n) | (PAGE_CACHE_SIZE-1));
633 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
636 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
637 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
639 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
641 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
643 ceph_put_page_vector(pages, num_pages, false);
645 ceph_osdc_put_request(req);
650 iov_iter_advance(from, n);
652 if (pos > i_size_read(inode)) {
653 check_caps = ceph_inode_set_size(inode, pos);
655 ceph_check_caps(ceph_inode(inode),
661 if (ret != -EOLDSNAPC && written > 0) {
670 * Synchronous write, straight from __user pointer or user pages.
672 * If write spans object boundary, just do multiple writes. (For a
673 * correct atomic write, we should e.g. take write locks on all
674 * objects, rollback on failure, etc.)
677 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
679 struct file *file = iocb->ki_filp;
680 struct inode *inode = file_inode(file);
681 struct ceph_inode_info *ci = ceph_inode(inode);
682 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
683 struct ceph_snap_context *snapc;
684 struct ceph_vino vino;
685 struct ceph_osd_request *req;
693 struct timespec mtime = CURRENT_TIME;
694 size_t count = iov_iter_count(from);
696 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
699 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
701 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
705 ret = invalidate_inode_pages2_range(inode->i_mapping,
706 pos >> PAGE_CACHE_SHIFT,
707 (pos + count) >> PAGE_CACHE_SHIFT);
709 dout("invalidate_inode_pages2_range returned %d\n", ret);
711 flags = CEPH_OSD_FLAG_ORDERSNAP |
712 CEPH_OSD_FLAG_ONDISK |
713 CEPH_OSD_FLAG_WRITE |
716 while ((len = iov_iter_count(from)) > 0) {
720 snapc = ci->i_snap_realm->cached_context;
721 vino = ceph_vino(inode);
722 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
723 vino, pos, &len, 0, 1,
724 CEPH_OSD_OP_WRITE, flags, snapc,
734 * write from beginning of first page,
735 * regardless of io alignment
737 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
739 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
741 ret = PTR_ERR(pages);
746 for (n = 0; n < num_pages; n++) {
747 size_t plen = min_t(size_t, left, PAGE_SIZE);
748 ret = copy_page_from_iter(pages[n], 0, plen, from);
757 ceph_release_page_vector(pages, num_pages);
761 /* get a second commit callback */
762 req->r_unsafe_callback = ceph_sync_write_unsafe;
763 req->r_inode = inode;
765 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
768 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
769 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
771 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
773 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
776 ceph_osdc_put_request(req);
781 if (pos > i_size_read(inode)) {
782 check_caps = ceph_inode_set_size(inode, pos);
784 ceph_check_caps(ceph_inode(inode),
792 if (ret != -EOLDSNAPC && written > 0) {
800 * Wrap generic_file_aio_read with checks for cap bits on the inode.
801 * Atomically grab references, so that those bits are not released
802 * back to the MDS mid-read.
804 * Hmm, the sync read case isn't actually async... should it be?
806 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
808 struct file *filp = iocb->ki_filp;
809 struct ceph_file_info *fi = filp->private_data;
810 size_t len = iov_iter_count(to);
811 struct inode *inode = file_inode(filp);
812 struct ceph_inode_info *ci = ceph_inode(inode);
813 struct page *pinned_page = NULL;
816 int retry_op = 0, read = 0;
819 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
820 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
822 if (fi->fmode & CEPH_FILE_MODE_LAZY)
823 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
825 want = CEPH_CAP_FILE_CACHE;
826 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
830 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
831 (iocb->ki_flags & IOCB_DIRECT) ||
832 (fi->flags & CEPH_F_SYNC)) {
834 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
835 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
836 ceph_cap_string(got));
838 if (ci->i_inline_version == CEPH_INLINE_NONE) {
839 /* hmm, this isn't really async... */
840 ret = ceph_sync_read(iocb, to, &retry_op);
842 retry_op = READ_INLINE;
845 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
846 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
847 ceph_cap_string(got));
849 ret = generic_file_read_iter(iocb, to);
851 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
852 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
854 page_cache_release(pinned_page);
857 ceph_put_cap_refs(ci, got);
858 if (retry_op && ret >= 0) {
860 struct page *page = NULL;
862 if (retry_op == READ_INLINE) {
863 page = __page_cache_alloc(GFP_NOFS);
868 statret = __ceph_do_getattr(inode, page,
869 CEPH_STAT_CAP_INLINE_DATA, !!page);
872 if (statret == -ENODATA) {
873 BUG_ON(retry_op != READ_INLINE);
879 i_size = i_size_read(inode);
880 if (retry_op == READ_INLINE) {
881 BUG_ON(ret > 0 || read > 0);
882 if (iocb->ki_pos < i_size &&
883 iocb->ki_pos < PAGE_CACHE_SIZE) {
884 loff_t end = min_t(loff_t, i_size,
886 end = min_t(loff_t, end, PAGE_CACHE_SIZE);
888 zero_user_segment(page, statret, end);
889 ret = copy_page_to_iter(page,
890 iocb->ki_pos & ~PAGE_MASK,
891 end - iocb->ki_pos, to);
895 if (iocb->ki_pos < i_size && read < len) {
896 size_t zlen = min_t(size_t, len - read,
897 i_size - iocb->ki_pos);
898 ret = iov_iter_zero(zlen, to);
902 __free_pages(page, 0);
906 /* hit EOF or hole? */
907 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
909 dout("sync_read hit hole, ppos %lld < size %lld"
910 ", reading more\n", iocb->ki_pos,
927 * Take cap references to avoid releasing caps to MDS mid-write.
929 * If we are synchronous, and write with an old snap context, the OSD
930 * may return EOLDSNAPC. In that case, retry the write.. _after_
931 * dropping our cap refs and allowing the pending snap to logically
932 * complete _before_ this write occurs.
934 * If we are near ENOSPC, write synchronously.
936 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
938 struct file *file = iocb->ki_filp;
939 struct ceph_file_info *fi = file->private_data;
940 struct inode *inode = file_inode(file);
941 struct ceph_inode_info *ci = ceph_inode(inode);
942 struct ceph_osd_client *osdc =
943 &ceph_sb_to_client(inode->i_sb)->client->osdc;
944 ssize_t count, written = 0;
948 if (ceph_snap(inode) != CEPH_NOSNAP)
951 mutex_lock(&inode->i_mutex);
953 /* We can write back this queue in page reclaim */
954 current->backing_dev_info = inode_to_bdi(inode);
956 err = generic_write_checks(iocb, from);
961 count = iov_iter_count(from);
962 err = file_remove_suid(file);
966 err = file_update_time(file);
970 if (ci->i_inline_version != CEPH_INLINE_NONE) {
971 err = ceph_uninline_data(file, NULL);
977 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
982 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
983 inode, ceph_vinop(inode), pos, count, inode->i_size);
984 if (fi->fmode & CEPH_FILE_MODE_LAZY)
985 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
987 want = CEPH_CAP_FILE_BUFFER;
989 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
994 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
995 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
997 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
998 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
999 struct iov_iter data;
1000 mutex_unlock(&inode->i_mutex);
1001 /* we might need to revert back to that point */
1003 if (iocb->ki_flags & IOCB_DIRECT)
1004 written = ceph_sync_direct_write(iocb, &data, pos);
1006 written = ceph_sync_write(iocb, &data, pos);
1007 if (written == -EOLDSNAPC) {
1008 dout("aio_write %p %llx.%llx %llu~%u"
1009 "got EOLDSNAPC, retrying\n",
1010 inode, ceph_vinop(inode),
1011 pos, (unsigned)count);
1012 mutex_lock(&inode->i_mutex);
1016 iov_iter_advance(from, written);
1018 loff_t old_size = inode->i_size;
1020 * No need to acquire the i_truncate_mutex. Because
1021 * the MDS revokes Fwb caps before sending truncate
1022 * message to us. We can't get Fwb cap while there
1023 * are pending vmtruncate. So write and vmtruncate
1024 * can not run at the same time
1026 written = generic_perform_write(file, from, pos);
1027 if (likely(written >= 0))
1028 iocb->ki_pos = pos + written;
1029 if (inode->i_size > old_size)
1030 ceph_fscache_update_objectsize(inode);
1031 mutex_unlock(&inode->i_mutex);
1036 spin_lock(&ci->i_ceph_lock);
1037 ci->i_inline_version = CEPH_INLINE_NONE;
1038 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1039 spin_unlock(&ci->i_ceph_lock);
1041 __mark_inode_dirty(inode, dirty);
1044 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1045 inode, ceph_vinop(inode), pos, (unsigned)count,
1046 ceph_cap_string(got));
1047 ceph_put_cap_refs(ci, got);
1050 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1051 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1052 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1060 mutex_unlock(&inode->i_mutex);
1062 current->backing_dev_info = NULL;
1063 return written ? written : err;
1067 * llseek. be sure to verify file size on SEEK_END.
1069 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1071 struct inode *inode = file->f_mapping->host;
1074 mutex_lock(&inode->i_mutex);
1076 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1077 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1086 offset += inode->i_size;
1090 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1091 * position-querying operation. Avoid rewriting the "same"
1092 * f_pos value back to the file because a concurrent read(),
1093 * write() or lseek() might have altered it
1096 offset = file->f_pos;
1099 offset += file->f_pos;
1102 if (offset >= inode->i_size) {
1108 if (offset >= inode->i_size) {
1112 offset = inode->i_size;
1116 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1119 mutex_unlock(&inode->i_mutex);
1123 static inline void ceph_zero_partial_page(
1124 struct inode *inode, loff_t offset, unsigned size)
1127 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1129 page = find_lock_page(inode->i_mapping, index);
1131 wait_on_page_writeback(page);
1132 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1134 page_cache_release(page);
1138 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1141 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1142 if (offset < nearly) {
1143 loff_t size = nearly - offset;
1146 ceph_zero_partial_page(inode, offset, size);
1150 if (length >= PAGE_CACHE_SIZE) {
1151 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1152 truncate_pagecache_range(inode, offset, offset + size - 1);
1157 ceph_zero_partial_page(inode, offset, length);
1160 static int ceph_zero_partial_object(struct inode *inode,
1161 loff_t offset, loff_t *length)
1163 struct ceph_inode_info *ci = ceph_inode(inode);
1164 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1165 struct ceph_osd_request *req;
1171 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1174 op = CEPH_OSD_OP_ZERO;
1177 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1181 CEPH_OSD_FLAG_WRITE |
1182 CEPH_OSD_FLAG_ONDISK,
1189 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1192 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1194 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1198 ceph_osdc_put_request(req);
1204 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1207 struct ceph_inode_info *ci = ceph_inode(inode);
1208 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1209 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1210 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1211 u64 object_set_size = object_size * stripe_count;
1214 /* round offset up to next period boundary */
1215 nearly = offset + object_set_size - 1;
1217 nearly -= do_div(t, object_set_size);
1219 while (length && offset < nearly) {
1220 loff_t size = length;
1221 ret = ceph_zero_partial_object(inode, offset, &size);
1227 while (length >= object_set_size) {
1229 loff_t pos = offset;
1230 for (i = 0; i < stripe_count; ++i) {
1231 ret = ceph_zero_partial_object(inode, pos, NULL);
1236 offset += object_set_size;
1237 length -= object_set_size;
1240 loff_t size = length;
1241 ret = ceph_zero_partial_object(inode, offset, &size);
1250 static long ceph_fallocate(struct file *file, int mode,
1251 loff_t offset, loff_t length)
1253 struct ceph_file_info *fi = file->private_data;
1254 struct inode *inode = file_inode(file);
1255 struct ceph_inode_info *ci = ceph_inode(inode);
1256 struct ceph_osd_client *osdc =
1257 &ceph_inode_to_client(inode)->client->osdc;
1264 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1267 if (!S_ISREG(inode->i_mode))
1270 mutex_lock(&inode->i_mutex);
1272 if (ceph_snap(inode) != CEPH_NOSNAP) {
1277 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1278 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1283 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1284 ret = ceph_uninline_data(file, NULL);
1289 size = i_size_read(inode);
1290 if (!(mode & FALLOC_FL_KEEP_SIZE))
1291 endoff = offset + length;
1293 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1294 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1296 want = CEPH_CAP_FILE_BUFFER;
1298 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1302 if (mode & FALLOC_FL_PUNCH_HOLE) {
1304 ceph_zero_pagecache_range(inode, offset, length);
1305 ret = ceph_zero_objects(inode, offset, length);
1306 } else if (endoff > size) {
1307 truncate_pagecache_range(inode, size, -1);
1308 if (ceph_inode_set_size(inode, endoff))
1309 ceph_check_caps(ceph_inode(inode),
1310 CHECK_CAPS_AUTHONLY, NULL);
1314 spin_lock(&ci->i_ceph_lock);
1315 ci->i_inline_version = CEPH_INLINE_NONE;
1316 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1317 spin_unlock(&ci->i_ceph_lock);
1319 __mark_inode_dirty(inode, dirty);
1322 ceph_put_cap_refs(ci, got);
1324 mutex_unlock(&inode->i_mutex);
1328 const struct file_operations ceph_file_fops = {
1330 .release = ceph_release,
1331 .llseek = ceph_llseek,
1332 .read_iter = ceph_read_iter,
1333 .write_iter = ceph_write_iter,
1335 .fsync = ceph_fsync,
1337 .flock = ceph_flock,
1338 .splice_read = generic_file_splice_read,
1339 .splice_write = iter_file_splice_write,
1340 .unlocked_ioctl = ceph_ioctl,
1341 .compat_ioctl = ceph_ioctl,
1342 .fallocate = ceph_fallocate,