1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/aio.h>
11 #include <linux/falloc.h>
14 #include "mds_client.h"
18 * Ceph file operations
20 * Implement basic open/close functionality, and implement
23 * We implement three modes of file I/O:
24 * - buffered uses the generic_file_aio_{read,write} helpers
26 * - synchronous is used when there is multi-client read/write
27 * sharing, avoids the page cache, and synchronously waits for an
30 * - direct io takes the variant of the sync path that references
31 * user pages directly.
33 * fsync() flushes and waits on dirty pages, but just queues metadata
34 * for writeback: since the MDS can recover size and mtime there is no
35 * need to wait for MDS acknowledgement.
40 * Prepare an open request. Preallocate ceph_cap to avoid an
41 * inopportune ENOMEM later.
43 static struct ceph_mds_request *
44 prepare_open_request(struct super_block *sb, int flags, int create_mode)
46 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
47 struct ceph_mds_client *mdsc = fsc->mdsc;
48 struct ceph_mds_request *req;
49 int want_auth = USE_ANY_MDS;
50 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
52 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
53 want_auth = USE_AUTH_MDS;
55 req = ceph_mdsc_create_request(mdsc, op, want_auth);
58 req->r_fmode = ceph_flags_to_mode(flags);
59 req->r_args.open.flags = cpu_to_le32(flags);
60 req->r_args.open.mode = cpu_to_le32(create_mode);
66 * initialize private struct file data.
67 * if we fail, clean up by dropping fmode reference on the ceph_inode
69 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
71 struct ceph_file_info *cf;
73 struct ceph_inode_info *ci = ceph_inode(inode);
74 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
75 struct ceph_mds_client *mdsc = fsc->mdsc;
77 switch (inode->i_mode & S_IFMT) {
79 /* First file open request creates the cookie, we want to keep
80 * this cookie around for the filetime of the inode as not to
81 * have to worry about fscache register / revoke / operation
84 * Also, if we know the operation is going to invalidate data
85 * (non readonly) just nuke the cache right away.
87 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
88 if ((fmode & CEPH_FILE_MODE_WR))
89 ceph_fscache_invalidate(inode);
91 dout("init_file %p %p 0%o (regular)\n", inode, file,
93 cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
95 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
100 file->private_data = cf;
101 BUG_ON(inode->i_fop->release != ceph_release);
105 dout("init_file %p %p 0%o (symlink)\n", inode, file,
107 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
111 dout("init_file %p %p 0%o (special)\n", inode, file,
114 * we need to drop the open ref now, since we don't
115 * have .release set to ceph_release.
117 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
118 BUG_ON(inode->i_fop->release == ceph_release);
120 /* call the proper open fop */
121 ret = inode->i_fop->open(inode, file);
127 * If we already have the requisite capabilities, we can satisfy
128 * the open request locally (no need to request new caps from the
129 * MDS). We do, however, need to inform the MDS (asynchronously)
130 * if our wanted caps set expands.
132 int ceph_open(struct inode *inode, struct file *file)
134 struct ceph_inode_info *ci = ceph_inode(inode);
135 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
136 struct ceph_mds_client *mdsc = fsc->mdsc;
137 struct ceph_mds_request *req;
138 struct ceph_file_info *cf = file->private_data;
139 struct inode *parent_inode = NULL;
141 int flags, fmode, wanted;
144 dout("open file %p is already opened\n", file);
148 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
149 flags = file->f_flags & ~(O_CREAT|O_EXCL);
150 if (S_ISDIR(inode->i_mode))
151 flags = O_DIRECTORY; /* mds likes to know */
153 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
154 ceph_vinop(inode), file, flags, file->f_flags);
155 fmode = ceph_flags_to_mode(flags);
156 wanted = ceph_caps_for_mode(fmode);
158 /* snapped files are read-only */
159 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
162 /* trivially open snapdir */
163 if (ceph_snap(inode) == CEPH_SNAPDIR) {
164 spin_lock(&ci->i_ceph_lock);
165 __ceph_get_fmode(ci, fmode);
166 spin_unlock(&ci->i_ceph_lock);
167 return ceph_init_file(inode, file, fmode);
171 * No need to block if we have caps on the auth MDS (for
172 * write) or any MDS (for read). Update wanted set
175 spin_lock(&ci->i_ceph_lock);
176 if (__ceph_is_any_real_caps(ci) &&
177 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
178 int mds_wanted = __ceph_caps_mds_wanted(ci);
179 int issued = __ceph_caps_issued(ci, NULL);
181 dout("open %p fmode %d want %s issued %s using existing\n",
182 inode, fmode, ceph_cap_string(wanted),
183 ceph_cap_string(issued));
184 __ceph_get_fmode(ci, fmode);
185 spin_unlock(&ci->i_ceph_lock);
188 if ((issued & wanted) != wanted &&
189 (mds_wanted & wanted) != wanted &&
190 ceph_snap(inode) != CEPH_SNAPDIR)
191 ceph_check_caps(ci, 0, NULL);
193 return ceph_init_file(inode, file, fmode);
194 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
195 (ci->i_snap_caps & wanted) == wanted) {
196 __ceph_get_fmode(ci, fmode);
197 spin_unlock(&ci->i_ceph_lock);
198 return ceph_init_file(inode, file, fmode);
201 spin_unlock(&ci->i_ceph_lock);
203 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
204 req = prepare_open_request(inode->i_sb, flags, 0);
209 req->r_inode = inode;
214 parent_inode = ceph_get_dentry_parent_inode(file->f_path.dentry);
215 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
218 err = ceph_init_file(inode, file, req->r_fmode);
219 ceph_mdsc_put_request(req);
220 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
227 * Do a lookup + open with a single request. If we get a non-existent
228 * file or symlink, return 1 so the VFS can retry.
230 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
231 struct file *file, unsigned flags, umode_t mode,
234 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
235 struct ceph_mds_client *mdsc = fsc->mdsc;
236 struct ceph_mds_request *req;
238 struct ceph_acls_info acls = {};
241 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
243 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
245 if (dentry->d_name.len > NAME_MAX)
246 return -ENAMETOOLONG;
248 err = ceph_init_dentry(dentry);
252 if (flags & O_CREAT) {
253 err = ceph_pre_init_acls(dir, &mode, &acls);
259 req = prepare_open_request(dir->i_sb, flags, mode);
264 req->r_dentry = dget(dentry);
266 if (flags & O_CREAT) {
267 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
268 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
270 req->r_pagelist = acls.pagelist;
271 acls.pagelist = NULL;
274 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
275 err = ceph_mdsc_do_request(mdsc,
276 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
278 err = ceph_handle_snapdir(req, dentry, err);
282 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
283 err = ceph_handle_notrace_create(dir, dentry);
285 if (d_unhashed(dentry)) {
286 dn = ceph_finish_lookup(req, dentry, err);
290 /* we were given a hashed negative dentry */
295 if (dn || dentry->d_inode == NULL || d_is_symlink(dentry)) {
296 /* make vfs retry on splice, ENOENT, or symlink */
297 dout("atomic_open finish_no_open on dn %p\n", dn);
298 err = finish_no_open(file, dn);
300 dout("atomic_open finish_open on dn %p\n", dn);
301 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
302 ceph_init_inode_acls(dentry->d_inode, &acls);
303 *opened |= FILE_CREATED;
305 err = finish_open(file, dentry, ceph_open, opened);
308 if (!req->r_err && req->r_target_inode)
309 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
310 ceph_mdsc_put_request(req);
312 ceph_release_acls_info(&acls);
313 dout("atomic_open result=%d\n", err);
317 int ceph_release(struct inode *inode, struct file *file)
319 struct ceph_inode_info *ci = ceph_inode(inode);
320 struct ceph_file_info *cf = file->private_data;
322 dout("release inode %p file %p\n", inode, file);
323 ceph_put_fmode(ci, cf->fmode);
324 if (cf->last_readdir)
325 ceph_mdsc_put_request(cf->last_readdir);
326 kfree(cf->last_name);
329 kmem_cache_free(ceph_file_cachep, cf);
331 /* wake up anyone waiting for caps on this inode */
332 wake_up_all(&ci->i_cap_wq);
342 * Read a range of bytes striped over one or more objects. Iterate over
343 * objects we stripe over. (That's not atomic, but good enough for now.)
345 * If we get a short result from the OSD, check against i_size; we need to
346 * only return a short read to the caller if we hit EOF.
348 static int striped_read(struct inode *inode,
350 struct page **pages, int num_pages,
351 int *checkeof, bool o_direct,
352 unsigned long buf_align)
354 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
355 struct ceph_inode_info *ci = ceph_inode(inode);
356 u64 pos, this_len, left;
357 int io_align, page_align;
360 struct page **page_pos;
362 bool hit_stripe, was_short;
365 * we may need to do multiple reads. not atomic, unfortunately.
370 pages_left = num_pages;
372 io_align = off & ~PAGE_MASK;
376 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
378 page_align = pos & ~PAGE_MASK;
380 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
381 &ci->i_layout, pos, &this_len,
384 page_pos, pages_left, page_align);
387 hit_stripe = this_len < left;
388 was_short = ret >= 0 && ret < this_len;
389 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
390 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
394 if (was_short && (pos + ret < inode->i_size)) {
395 int zlen = min(this_len - ret,
396 inode->i_size - pos - ret);
397 int zoff = (o_direct ? buf_align : io_align) +
399 dout(" zero gap %llu to %llu\n",
400 pos + ret, pos + ret + zlen);
401 ceph_zero_page_vector_range(zoff, zlen, pages);
405 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
409 page_pos += didpages;
410 pages_left -= didpages;
412 /* hit stripe and need continue*/
413 if (left && hit_stripe && pos < inode->i_size)
419 /* did we bounce off eof? */
420 if (pos + left > inode->i_size)
421 *checkeof = CHECK_EOF;
424 dout("striped_read returns %d\n", ret);
429 * Completely synchronous read and write methods. Direct from __user
430 * buffer to osd, or directly to user pages (if O_DIRECT).
432 * If the read spans object boundary, just do multiple reads.
434 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
437 struct file *file = iocb->ki_filp;
438 struct inode *inode = file_inode(file);
440 u64 off = iocb->ki_pos;
442 size_t len = iov_iter_count(i);
444 dout("sync_read on file %p %llu~%u %s\n", file, off,
446 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
451 * flush any page cache pages in this range. this
452 * will make concurrent normal and sync io slow,
453 * but it will at least behave sensibly when they are
456 ret = filemap_write_and_wait_range(inode->i_mapping, off,
461 if (file->f_flags & O_DIRECT) {
462 while (iov_iter_count(i)) {
466 n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
470 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
472 ret = striped_read(inode, off, n,
473 pages, num_pages, checkeof,
476 ceph_put_page_vector(pages, num_pages, true);
481 iov_iter_advance(i, ret);
486 num_pages = calc_pages_for(off, len);
487 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
489 return PTR_ERR(pages);
490 ret = striped_read(inode, off, len, pages,
491 num_pages, checkeof, 0, 0);
497 size_t page_off = off & ~PAGE_MASK;
498 size_t copy = min_t(size_t,
499 PAGE_SIZE - page_off, left);
500 l = copy_page_to_iter(pages[k++], page_off,
508 ceph_release_page_vector(pages, num_pages);
511 if (off > iocb->ki_pos) {
512 ret = off - iocb->ki_pos;
516 dout("sync_read result %d\n", ret);
521 * Write commit request unsafe callback, called to tell us when a
522 * request is unsafe (that is, in flight--has been handed to the
523 * messenger to send to its target osd). It is called again when
524 * we've received a response message indicating the request is
525 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
526 * is completed early (and unsuccessfully) due to a timeout or
529 * This is used if we requested both an ACK and ONDISK commit reply
532 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
534 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
536 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
539 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
540 spin_lock(&ci->i_unsafe_lock);
541 list_add_tail(&req->r_unsafe_item,
542 &ci->i_unsafe_writes);
543 spin_unlock(&ci->i_unsafe_lock);
545 spin_lock(&ci->i_unsafe_lock);
546 list_del_init(&req->r_unsafe_item);
547 spin_unlock(&ci->i_unsafe_lock);
548 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
554 * Synchronous write, straight from __user pointer or user pages.
556 * If write spans object boundary, just do multiple writes. (For a
557 * correct atomic write, we should e.g. take write locks on all
558 * objects, rollback on failure, etc.)
561 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
563 struct file *file = iocb->ki_filp;
564 struct inode *inode = file_inode(file);
565 struct ceph_inode_info *ci = ceph_inode(inode);
566 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
567 struct ceph_snap_context *snapc;
568 struct ceph_vino vino;
569 struct ceph_osd_request *req;
576 struct timespec mtime = CURRENT_TIME;
577 size_t count = iov_iter_count(from);
579 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
582 dout("sync_direct_write on file %p %lld~%u\n", file, pos,
585 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
589 ret = invalidate_inode_pages2_range(inode->i_mapping,
590 pos >> PAGE_CACHE_SHIFT,
591 (pos + count) >> PAGE_CACHE_SHIFT);
593 dout("invalidate_inode_pages2_range returned %d\n", ret);
595 flags = CEPH_OSD_FLAG_ORDERSNAP |
596 CEPH_OSD_FLAG_ONDISK |
599 while (iov_iter_count(from) > 0) {
600 u64 len = iov_iter_single_seg_count(from);
604 snapc = ci->i_snap_realm->cached_context;
605 vino = ceph_vino(inode);
606 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
608 2,/*include a 'startsync' command*/
609 CEPH_OSD_OP_WRITE, flags, snapc,
618 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC);
620 n = iov_iter_get_pages_alloc(from, &pages, len, &start);
621 if (unlikely(n < 0)) {
623 ceph_osdc_put_request(req);
627 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
629 * throw out any page cache pages in this range. this
632 truncate_inode_pages_range(inode->i_mapping, pos,
633 (pos+n) | (PAGE_CACHE_SIZE-1));
634 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
637 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
638 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
640 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
642 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
644 ceph_put_page_vector(pages, num_pages, false);
646 ceph_osdc_put_request(req);
651 iov_iter_advance(from, n);
653 if (pos > i_size_read(inode)) {
654 check_caps = ceph_inode_set_size(inode, pos);
656 ceph_check_caps(ceph_inode(inode),
662 if (ret != -EOLDSNAPC && written > 0) {
671 * Synchronous write, straight from __user pointer or user pages.
673 * If write spans object boundary, just do multiple writes. (For a
674 * correct atomic write, we should e.g. take write locks on all
675 * objects, rollback on failure, etc.)
678 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
680 struct file *file = iocb->ki_filp;
681 struct inode *inode = file_inode(file);
682 struct ceph_inode_info *ci = ceph_inode(inode);
683 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
684 struct ceph_snap_context *snapc;
685 struct ceph_vino vino;
686 struct ceph_osd_request *req;
694 struct timespec mtime = CURRENT_TIME;
695 size_t count = iov_iter_count(from);
697 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
700 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
702 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
706 ret = invalidate_inode_pages2_range(inode->i_mapping,
707 pos >> PAGE_CACHE_SHIFT,
708 (pos + count) >> PAGE_CACHE_SHIFT);
710 dout("invalidate_inode_pages2_range returned %d\n", ret);
712 flags = CEPH_OSD_FLAG_ORDERSNAP |
713 CEPH_OSD_FLAG_ONDISK |
714 CEPH_OSD_FLAG_WRITE |
717 while ((len = iov_iter_count(from)) > 0) {
721 snapc = ci->i_snap_realm->cached_context;
722 vino = ceph_vino(inode);
723 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
724 vino, pos, &len, 0, 1,
725 CEPH_OSD_OP_WRITE, flags, snapc,
735 * write from beginning of first page,
736 * regardless of io alignment
738 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
740 pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
742 ret = PTR_ERR(pages);
747 for (n = 0; n < num_pages; n++) {
748 size_t plen = min_t(size_t, left, PAGE_SIZE);
749 ret = copy_page_from_iter(pages[n], 0, plen, from);
758 ceph_release_page_vector(pages, num_pages);
762 /* get a second commit callback */
763 req->r_unsafe_callback = ceph_sync_write_unsafe;
764 req->r_inode = inode;
766 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
769 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
770 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
772 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
774 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
777 ceph_osdc_put_request(req);
782 if (pos > i_size_read(inode)) {
783 check_caps = ceph_inode_set_size(inode, pos);
785 ceph_check_caps(ceph_inode(inode),
793 if (ret != -EOLDSNAPC && written > 0) {
801 * Wrap generic_file_aio_read with checks for cap bits on the inode.
802 * Atomically grab references, so that those bits are not released
803 * back to the MDS mid-read.
805 * Hmm, the sync read case isn't actually async... should it be?
807 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
809 struct file *filp = iocb->ki_filp;
810 struct ceph_file_info *fi = filp->private_data;
811 size_t len = iocb->ki_nbytes;
812 struct inode *inode = file_inode(filp);
813 struct ceph_inode_info *ci = ceph_inode(inode);
814 struct page *pinned_page = NULL;
817 int retry_op = 0, read = 0;
820 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
821 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
823 if (fi->fmode & CEPH_FILE_MODE_LAZY)
824 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
826 want = CEPH_CAP_FILE_CACHE;
827 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
831 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
832 (iocb->ki_filp->f_flags & O_DIRECT) ||
833 (fi->flags & CEPH_F_SYNC)) {
835 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
836 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
837 ceph_cap_string(got));
839 if (ci->i_inline_version == CEPH_INLINE_NONE) {
840 /* hmm, this isn't really async... */
841 ret = ceph_sync_read(iocb, to, &retry_op);
843 retry_op = READ_INLINE;
846 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
847 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
848 ceph_cap_string(got));
850 ret = generic_file_read_iter(iocb, to);
852 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
853 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
855 page_cache_release(pinned_page);
858 ceph_put_cap_refs(ci, got);
859 if (retry_op && ret >= 0) {
861 struct page *page = NULL;
863 if (retry_op == READ_INLINE) {
864 page = __page_cache_alloc(GFP_NOFS);
869 statret = __ceph_do_getattr(inode, page,
870 CEPH_STAT_CAP_INLINE_DATA, !!page);
873 if (statret == -ENODATA) {
874 BUG_ON(retry_op != READ_INLINE);
880 i_size = i_size_read(inode);
881 if (retry_op == READ_INLINE) {
882 BUG_ON(ret > 0 || read > 0);
883 if (iocb->ki_pos < i_size &&
884 iocb->ki_pos < PAGE_CACHE_SIZE) {
885 loff_t end = min_t(loff_t, i_size,
887 end = min_t(loff_t, end, PAGE_CACHE_SIZE);
889 zero_user_segment(page, statret, end);
890 ret = copy_page_to_iter(page,
891 iocb->ki_pos & ~PAGE_MASK,
892 end - iocb->ki_pos, to);
896 if (iocb->ki_pos < i_size && read < len) {
897 size_t zlen = min_t(size_t, len - read,
898 i_size - iocb->ki_pos);
899 ret = iov_iter_zero(zlen, to);
903 __free_pages(page, 0);
907 /* hit EOF or hole? */
908 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
910 dout("sync_read hit hole, ppos %lld < size %lld"
911 ", reading more\n", iocb->ki_pos,
928 * Take cap references to avoid releasing caps to MDS mid-write.
930 * If we are synchronous, and write with an old snap context, the OSD
931 * may return EOLDSNAPC. In that case, retry the write.. _after_
932 * dropping our cap refs and allowing the pending snap to logically
933 * complete _before_ this write occurs.
935 * If we are near ENOSPC, write synchronously.
937 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
939 struct file *file = iocb->ki_filp;
940 struct ceph_file_info *fi = file->private_data;
941 struct inode *inode = file_inode(file);
942 struct ceph_inode_info *ci = ceph_inode(inode);
943 struct ceph_osd_client *osdc =
944 &ceph_sb_to_client(inode->i_sb)->client->osdc;
945 ssize_t count = iov_iter_count(from), written = 0;
947 loff_t pos = iocb->ki_pos;
949 if (ceph_snap(inode) != CEPH_NOSNAP)
952 mutex_lock(&inode->i_mutex);
954 /* We can write back this queue in page reclaim */
955 current->backing_dev_info = inode_to_bdi(inode);
957 err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
963 iov_iter_truncate(from, count);
965 err = file_remove_suid(file);
969 err = file_update_time(file);
973 if (ci->i_inline_version != CEPH_INLINE_NONE) {
974 err = ceph_uninline_data(file, NULL);
980 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
985 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
986 inode, ceph_vinop(inode), pos, count, inode->i_size);
987 if (fi->fmode & CEPH_FILE_MODE_LAZY)
988 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
990 want = CEPH_CAP_FILE_BUFFER;
992 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
997 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
998 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1000 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1001 (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1002 struct iov_iter data;
1003 mutex_unlock(&inode->i_mutex);
1004 /* we might need to revert back to that point */
1006 if (file->f_flags & O_DIRECT)
1007 written = ceph_sync_direct_write(iocb, &data, pos);
1009 written = ceph_sync_write(iocb, &data, pos);
1010 if (written == -EOLDSNAPC) {
1011 dout("aio_write %p %llx.%llx %llu~%u"
1012 "got EOLDSNAPC, retrying\n",
1013 inode, ceph_vinop(inode),
1014 pos, (unsigned)count);
1015 mutex_lock(&inode->i_mutex);
1019 iov_iter_advance(from, written);
1021 loff_t old_size = inode->i_size;
1023 * No need to acquire the i_truncate_mutex. Because
1024 * the MDS revokes Fwb caps before sending truncate
1025 * message to us. We can't get Fwb cap while there
1026 * are pending vmtruncate. So write and vmtruncate
1027 * can not run at the same time
1029 written = generic_perform_write(file, from, pos);
1030 if (likely(written >= 0))
1031 iocb->ki_pos = pos + written;
1032 if (inode->i_size > old_size)
1033 ceph_fscache_update_objectsize(inode);
1034 mutex_unlock(&inode->i_mutex);
1039 spin_lock(&ci->i_ceph_lock);
1040 ci->i_inline_version = CEPH_INLINE_NONE;
1041 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1042 spin_unlock(&ci->i_ceph_lock);
1044 __mark_inode_dirty(inode, dirty);
1047 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1048 inode, ceph_vinop(inode), pos, (unsigned)count,
1049 ceph_cap_string(got));
1050 ceph_put_cap_refs(ci, got);
1053 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1054 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1055 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1063 mutex_unlock(&inode->i_mutex);
1065 current->backing_dev_info = NULL;
1066 return written ? written : err;
1070 * llseek. be sure to verify file size on SEEK_END.
1072 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1074 struct inode *inode = file->f_mapping->host;
1077 mutex_lock(&inode->i_mutex);
1079 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1080 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1089 offset += inode->i_size;
1093 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1094 * position-querying operation. Avoid rewriting the "same"
1095 * f_pos value back to the file because a concurrent read(),
1096 * write() or lseek() might have altered it
1099 offset = file->f_pos;
1102 offset += file->f_pos;
1105 if (offset >= inode->i_size) {
1111 if (offset >= inode->i_size) {
1115 offset = inode->i_size;
1119 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1122 mutex_unlock(&inode->i_mutex);
1126 static inline void ceph_zero_partial_page(
1127 struct inode *inode, loff_t offset, unsigned size)
1130 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1132 page = find_lock_page(inode->i_mapping, index);
1134 wait_on_page_writeback(page);
1135 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1137 page_cache_release(page);
1141 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1144 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1145 if (offset < nearly) {
1146 loff_t size = nearly - offset;
1149 ceph_zero_partial_page(inode, offset, size);
1153 if (length >= PAGE_CACHE_SIZE) {
1154 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1155 truncate_pagecache_range(inode, offset, offset + size - 1);
1160 ceph_zero_partial_page(inode, offset, length);
1163 static int ceph_zero_partial_object(struct inode *inode,
1164 loff_t offset, loff_t *length)
1166 struct ceph_inode_info *ci = ceph_inode(inode);
1167 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1168 struct ceph_osd_request *req;
1174 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1177 op = CEPH_OSD_OP_ZERO;
1180 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1184 CEPH_OSD_FLAG_WRITE |
1185 CEPH_OSD_FLAG_ONDISK,
1192 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1195 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1197 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1201 ceph_osdc_put_request(req);
1207 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1210 struct ceph_inode_info *ci = ceph_inode(inode);
1211 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1212 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1213 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1214 u64 object_set_size = object_size * stripe_count;
1217 /* round offset up to next period boundary */
1218 nearly = offset + object_set_size - 1;
1220 nearly -= do_div(t, object_set_size);
1222 while (length && offset < nearly) {
1223 loff_t size = length;
1224 ret = ceph_zero_partial_object(inode, offset, &size);
1230 while (length >= object_set_size) {
1232 loff_t pos = offset;
1233 for (i = 0; i < stripe_count; ++i) {
1234 ret = ceph_zero_partial_object(inode, pos, NULL);
1239 offset += object_set_size;
1240 length -= object_set_size;
1243 loff_t size = length;
1244 ret = ceph_zero_partial_object(inode, offset, &size);
1253 static long ceph_fallocate(struct file *file, int mode,
1254 loff_t offset, loff_t length)
1256 struct ceph_file_info *fi = file->private_data;
1257 struct inode *inode = file_inode(file);
1258 struct ceph_inode_info *ci = ceph_inode(inode);
1259 struct ceph_osd_client *osdc =
1260 &ceph_inode_to_client(inode)->client->osdc;
1267 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1270 if (!S_ISREG(inode->i_mode))
1273 mutex_lock(&inode->i_mutex);
1275 if (ceph_snap(inode) != CEPH_NOSNAP) {
1280 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1281 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1286 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1287 ret = ceph_uninline_data(file, NULL);
1292 size = i_size_read(inode);
1293 if (!(mode & FALLOC_FL_KEEP_SIZE))
1294 endoff = offset + length;
1296 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1297 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1299 want = CEPH_CAP_FILE_BUFFER;
1301 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1305 if (mode & FALLOC_FL_PUNCH_HOLE) {
1307 ceph_zero_pagecache_range(inode, offset, length);
1308 ret = ceph_zero_objects(inode, offset, length);
1309 } else if (endoff > size) {
1310 truncate_pagecache_range(inode, size, -1);
1311 if (ceph_inode_set_size(inode, endoff))
1312 ceph_check_caps(ceph_inode(inode),
1313 CHECK_CAPS_AUTHONLY, NULL);
1317 spin_lock(&ci->i_ceph_lock);
1318 ci->i_inline_version = CEPH_INLINE_NONE;
1319 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1320 spin_unlock(&ci->i_ceph_lock);
1322 __mark_inode_dirty(inode, dirty);
1325 ceph_put_cap_refs(ci, got);
1327 mutex_unlock(&inode->i_mutex);
1331 const struct file_operations ceph_file_fops = {
1333 .release = ceph_release,
1334 .llseek = ceph_llseek,
1335 .read = new_sync_read,
1336 .write = new_sync_write,
1337 .read_iter = ceph_read_iter,
1338 .write_iter = ceph_write_iter,
1340 .fsync = ceph_fsync,
1342 .flock = ceph_flock,
1343 .splice_read = generic_file_splice_read,
1344 .splice_write = iter_file_splice_write,
1345 .unlocked_ioctl = ceph_ioctl,
1346 .compat_ioctl = ceph_ioctl,
1347 .fallocate = ceph_fallocate,