1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/spinlock.h>
4 #include <linux/fs_struct.h>
5 #include <linux/namei.h>
6 #include <linux/slab.h>
7 #include <linux/sched.h>
10 #include "mds_client.h"
13 * Directory operations: readdir, lookup, create, link, unlink,
18 * Ceph MDS operations are specified in terms of a base ino and
19 * relative path. Thus, the client can specify an operation on a
20 * specific inode (e.g., a getattr due to fstat(2)), or as a path
21 * relative to, say, the root directory.
23 * Normally, we limit ourselves to strict inode ops (no path component)
24 * or dentry operations (a single path component relative to an ino). The
25 * exception to this is open_root_dentry(), which will open the mount
29 const struct dentry_operations ceph_dentry_ops;
32 * Initialize ceph dentry state.
34 int ceph_init_dentry(struct dentry *dentry)
36 struct ceph_dentry_info *di;
41 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
43 return -ENOMEM; /* oh well */
45 spin_lock(&dentry->d_lock);
46 if (dentry->d_fsdata) {
48 kmem_cache_free(ceph_dentry_cachep, di);
52 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP)
53 d_set_d_op(dentry, &ceph_dentry_ops);
54 else if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR)
55 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
57 d_set_d_op(dentry, &ceph_snap_dentry_ops);
60 di->lease_session = NULL;
61 dentry->d_time = jiffies;
62 /* avoid reordering d_fsdata setup so that the check above is safe */
64 dentry->d_fsdata = di;
65 ceph_dentry_lru_add(dentry);
67 spin_unlock(&dentry->d_lock);
71 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
73 struct inode *inode = NULL;
78 spin_lock(&dentry->d_lock);
79 if (!IS_ROOT(dentry)) {
80 inode = d_inode(dentry->d_parent);
83 spin_unlock(&dentry->d_lock);
89 * for readdir, we encode the directory frag and offset within that
92 static unsigned fpos_frag(loff_t p)
96 static unsigned fpos_off(loff_t p)
98 return p & 0xffffffff;
101 static int fpos_cmp(loff_t l, loff_t r)
103 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
106 return (int)(fpos_off(l) - fpos_off(r));
110 * When possible, we try to satisfy a readdir by peeking at the
111 * dcache. We make this work by carefully ordering dentries on
112 * d_child when we initially get results back from the MDS, and
113 * falling back to a "normal" sync readdir if any dentries in the dir
116 * Complete dir indicates that we have all dentries in the dir. It is
117 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
118 * the MDS if/when the directory is modified).
120 static int __dcache_readdir(struct file *file, struct dir_context *ctx,
123 struct ceph_file_info *fi = file->private_data;
124 struct dentry *parent = file->f_path.dentry;
125 struct inode *dir = d_inode(parent);
127 struct dentry *dentry, *last;
128 struct ceph_dentry_info *di;
131 /* claim ref on last dentry we returned */
135 dout("__dcache_readdir %p v%u at %llu (last %p)\n",
136 dir, shared_gen, ctx->pos, last);
138 spin_lock(&parent->d_lock);
140 /* start at beginning? */
141 if (ctx->pos == 2 || last == NULL ||
142 fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) {
143 if (list_empty(&parent->d_subdirs))
145 p = parent->d_subdirs.prev;
146 dout(" initial p %p/%p\n", p->prev, p->next);
148 p = last->d_child.prev;
152 dentry = list_entry(p, struct dentry, d_child);
153 di = ceph_dentry(dentry);
155 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
156 d_unhashed(dentry) ? "!hashed" : "hashed",
157 parent->d_subdirs.prev, parent->d_subdirs.next);
158 if (p == &parent->d_subdirs) {
159 fi->flags |= CEPH_F_ATEND;
162 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
163 if (di->lease_shared_gen == shared_gen &&
164 !d_unhashed(dentry) && d_really_is_positive(dentry) &&
165 ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR &&
166 ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH &&
167 fpos_cmp(ctx->pos, di->offset) <= 0)
169 dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry,
171 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
172 !d_inode(dentry) ? " null" : "");
173 spin_unlock(&dentry->d_lock);
175 dentry = list_entry(p, struct dentry, d_child);
176 di = ceph_dentry(dentry);
180 spin_unlock(&dentry->d_lock);
181 spin_unlock(&parent->d_lock);
183 /* make sure a dentry wasn't dropped while we didn't have parent lock */
184 if (!ceph_dir_is_complete_ordered(dir)) {
185 dout(" lost dir complete on %p; falling back to mds\n", dir);
191 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos,
192 dentry, dentry, d_inode(dentry));
193 if (!dir_emit(ctx, dentry->d_name.name,
195 ceph_translate_ino(dentry->d_sb, d_inode(dentry)->i_ino),
196 d_inode(dentry)->i_mode >> 12)) {
198 /* remember our position */
200 fi->next_offset = fpos_off(di->offset);
206 ctx->pos = di->offset + 1;
212 spin_lock(&parent->d_lock);
213 p = p->prev; /* advance to next dentry */
217 spin_unlock(&parent->d_lock);
225 * make note of the last dentry we read, so we can
226 * continue at the same lexicographical point,
227 * regardless of what dir changes take place on the
230 static int note_last_dentry(struct ceph_file_info *fi, const char *name,
233 kfree(fi->last_name);
234 fi->last_name = kmalloc(len+1, GFP_NOFS);
237 memcpy(fi->last_name, name, len);
238 fi->last_name[len] = 0;
239 dout("note_last_dentry '%s'\n", fi->last_name);
243 static int ceph_readdir(struct file *file, struct dir_context *ctx)
245 struct ceph_file_info *fi = file->private_data;
246 struct inode *inode = file_inode(file);
247 struct ceph_inode_info *ci = ceph_inode(inode);
248 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
249 struct ceph_mds_client *mdsc = fsc->mdsc;
250 unsigned frag = fpos_frag(ctx->pos);
251 int off = fpos_off(ctx->pos);
254 struct ceph_mds_reply_info_parsed *rinfo;
256 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
257 if (fi->flags & CEPH_F_ATEND)
260 /* always start with . and .. */
262 dout("readdir off 0 -> '.'\n");
263 if (!dir_emit(ctx, ".", 1,
264 ceph_translate_ino(inode->i_sb, inode->i_ino),
265 inode->i_mode >> 12))
271 ino_t ino = parent_ino(file->f_path.dentry);
272 dout("readdir off 1 -> '..'\n");
273 if (!dir_emit(ctx, "..", 2,
274 ceph_translate_ino(inode->i_sb, ino),
275 inode->i_mode >> 12))
281 /* can we use the dcache? */
282 spin_lock(&ci->i_ceph_lock);
283 if ((ctx->pos == 2 || fi->dentry) &&
284 ceph_test_mount_opt(fsc, DCACHE) &&
285 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
286 ceph_snap(inode) != CEPH_SNAPDIR &&
287 __ceph_dir_is_complete_ordered(ci) &&
288 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
289 u32 shared_gen = ci->i_shared_gen;
290 spin_unlock(&ci->i_ceph_lock);
291 err = __dcache_readdir(file, ctx, shared_gen);
294 frag = fpos_frag(ctx->pos);
295 off = fpos_off(ctx->pos);
297 spin_unlock(&ci->i_ceph_lock);
300 err = note_last_dentry(fi, fi->dentry->d_name.name,
301 fi->dentry->d_name.len);
308 /* proceed with a normal readdir */
311 /* note dir version at start of readdir so we can tell
312 * if any dentries get dropped */
313 fi->dir_release_count = atomic_read(&ci->i_release_count);
314 fi->dir_ordered_count = ci->i_ordered_count;
318 /* do we have the correct frag content buffered? */
319 if (fi->frag != frag || fi->last_readdir == NULL) {
320 struct ceph_mds_request *req;
321 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
322 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
324 /* discard old result, if any */
325 if (fi->last_readdir) {
326 ceph_mdsc_put_request(fi->last_readdir);
327 fi->last_readdir = NULL;
330 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
331 ceph_vinop(inode), frag, fi->last_name);
332 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
335 err = ceph_alloc_readdir_reply_buffer(req, inode);
337 ceph_mdsc_put_request(req);
340 /* hints to request -> mds selection code */
341 req->r_direct_mode = USE_AUTH_MDS;
342 req->r_direct_hash = ceph_frag_value(frag);
343 req->r_direct_is_hash = true;
345 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
347 ceph_mdsc_put_request(req);
351 req->r_readdir_offset = fi->next_offset;
352 req->r_args.readdir.frag = cpu_to_le32(frag);
354 req->r_inode = inode;
356 req->r_dentry = dget(file->f_path.dentry);
357 err = ceph_mdsc_do_request(mdsc, NULL, req);
359 ceph_mdsc_put_request(req);
362 dout("readdir got and parsed readdir result=%d"
363 " on frag %x, end=%d, complete=%d\n", err, frag,
364 (int)req->r_reply_info.dir_end,
365 (int)req->r_reply_info.dir_complete);
367 if (!req->r_did_prepopulate) {
368 dout("readdir !did_prepopulate");
369 /* preclude from marking dir complete */
370 fi->dir_release_count--;
373 /* note next offset and last dentry name */
374 rinfo = &req->r_reply_info;
375 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
376 frag = le32_to_cpu(rinfo->dir_dir->frag);
377 if (ceph_frag_is_leftmost(frag))
381 off = fi->next_offset;
384 fi->offset = fi->next_offset;
385 fi->last_readdir = req;
387 if (req->r_reply_info.dir_end) {
388 kfree(fi->last_name);
389 fi->last_name = NULL;
390 if (ceph_frag_is_rightmost(frag))
395 err = note_last_dentry(fi,
396 rinfo->dir_dname[rinfo->dir_nr-1],
397 rinfo->dir_dname_len[rinfo->dir_nr-1]);
400 fi->next_offset += rinfo->dir_nr;
404 rinfo = &fi->last_readdir->r_reply_info;
405 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
406 rinfo->dir_nr, off, fi->offset);
408 ctx->pos = ceph_make_fpos(frag, off);
409 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
410 struct ceph_mds_reply_inode *in =
411 rinfo->dir_in[off - fi->offset].in;
412 struct ceph_vino vino;
415 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
416 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
417 rinfo->dir_dname_len[off - fi->offset],
418 rinfo->dir_dname[off - fi->offset], in);
420 ftype = le32_to_cpu(in->mode) >> 12;
421 vino.ino = le64_to_cpu(in->ino);
422 vino.snap = le64_to_cpu(in->snapid);
423 ino = ceph_vino_to_ino(vino);
425 rinfo->dir_dname[off - fi->offset],
426 rinfo->dir_dname_len[off - fi->offset],
427 ceph_translate_ino(inode->i_sb, ino), ftype)) {
428 dout("filldir stopping us...\n");
436 ceph_mdsc_put_request(fi->last_readdir);
437 fi->last_readdir = NULL;
442 if (!ceph_frag_is_rightmost(frag)) {
443 frag = ceph_frag_next(frag);
445 ctx->pos = ceph_make_fpos(frag, off);
446 dout("readdir next frag is %x\n", frag);
449 fi->flags |= CEPH_F_ATEND;
452 * if dir_release_count still matches the dir, no dentries
453 * were released during the whole readdir, and we should have
454 * the complete dir contents in our cache.
456 spin_lock(&ci->i_ceph_lock);
457 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
458 if (ci->i_ordered_count == fi->dir_ordered_count)
459 dout(" marking %p complete and ordered\n", inode);
461 dout(" marking %p complete\n", inode);
462 __ceph_dir_set_complete(ci, fi->dir_release_count,
463 fi->dir_ordered_count);
465 spin_unlock(&ci->i_ceph_lock);
467 dout("readdir %p file %p done.\n", inode, file);
471 static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
473 if (fi->last_readdir) {
474 ceph_mdsc_put_request(fi->last_readdir);
475 fi->last_readdir = NULL;
477 kfree(fi->last_name);
478 fi->last_name = NULL;
479 if (ceph_frag_is_leftmost(frag))
480 fi->next_offset = 2; /* compensate for . and .. */
487 fi->flags &= ~CEPH_F_ATEND;
490 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
492 struct ceph_file_info *fi = file->private_data;
493 struct inode *inode = file->f_mapping->host;
494 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
497 mutex_lock(&inode->i_mutex);
501 offset += inode->i_size + 2; /* FIXME */
504 offset += file->f_pos;
512 if (offset != file->f_pos) {
513 file->f_pos = offset;
515 fi->flags &= ~CEPH_F_ATEND;
520 * discard buffered readdir content on seekdir(0), or
521 * seek to new frag, or seek prior to current chunk.
524 fpos_frag(offset) != fi->frag ||
525 fpos_off(offset) < fi->offset) {
526 dout("dir_llseek dropping %p content\n", file);
527 reset_readdir(fi, fpos_frag(offset));
530 /* bump dir_release_count if we did a forward seek */
531 if (fpos_cmp(offset, old_offset) > 0)
532 fi->dir_release_count--;
535 mutex_unlock(&inode->i_mutex);
540 * Handle lookups for the hidden .snap directory.
542 int ceph_handle_snapdir(struct ceph_mds_request *req,
543 struct dentry *dentry, int err)
545 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
546 struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
549 if (err == -ENOENT &&
550 ceph_snap(parent) == CEPH_NOSNAP &&
551 strcmp(dentry->d_name.name,
552 fsc->mount_options->snapdir_name) == 0) {
553 struct inode *inode = ceph_get_snapdir(parent);
554 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
555 dentry, dentry, inode);
556 BUG_ON(!d_unhashed(dentry));
557 d_add(dentry, inode);
564 * Figure out final result of a lookup/open request.
566 * Mainly, make sure we return the final req->r_dentry (if it already
567 * existed) in place of the original VFS-provided dentry when they
570 * Gracefully handle the case where the MDS replies with -ENOENT and
571 * no trace (which it may do, at its discretion, e.g., if it doesn't
572 * care to issue a lease on the negative dentry).
574 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
575 struct dentry *dentry, int err)
577 if (err == -ENOENT) {
580 if (!req->r_reply_info.head->is_dentry) {
581 dout("ENOENT and no trace, dentry %p inode %p\n",
582 dentry, d_inode(dentry));
583 if (d_really_is_positive(dentry)) {
592 dentry = ERR_PTR(err);
593 else if (dentry != req->r_dentry)
594 dentry = dget(req->r_dentry); /* we got spliced */
600 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
602 return ceph_ino(inode) == CEPH_INO_ROOT &&
603 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
607 * Look up a single dir entry. If there is a lookup intent, inform
608 * the MDS so that it gets our 'caps wanted' value in a single op.
610 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
613 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
614 struct ceph_mds_client *mdsc = fsc->mdsc;
615 struct ceph_mds_request *req;
619 dout("lookup %p dentry %p '%pd'\n",
620 dir, dentry, dentry);
622 if (dentry->d_name.len > NAME_MAX)
623 return ERR_PTR(-ENAMETOOLONG);
625 err = ceph_init_dentry(dentry);
629 /* can we conclude ENOENT locally? */
630 if (d_really_is_negative(dentry)) {
631 struct ceph_inode_info *ci = ceph_inode(dir);
632 struct ceph_dentry_info *di = ceph_dentry(dentry);
634 spin_lock(&ci->i_ceph_lock);
635 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
636 if (strncmp(dentry->d_name.name,
637 fsc->mount_options->snapdir_name,
638 dentry->d_name.len) &&
639 !is_root_ceph_dentry(dir, dentry) &&
640 ceph_test_mount_opt(fsc, DCACHE) &&
641 __ceph_dir_is_complete(ci) &&
642 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
643 spin_unlock(&ci->i_ceph_lock);
644 dout(" dir %p complete, -ENOENT\n", dir);
646 di->lease_shared_gen = ci->i_shared_gen;
649 spin_unlock(&ci->i_ceph_lock);
652 op = ceph_snap(dir) == CEPH_SNAPDIR ?
653 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
654 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
656 return ERR_CAST(req);
657 req->r_dentry = dget(dentry);
659 /* we only need inode linkage */
660 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
661 req->r_locked_dir = dir;
662 err = ceph_mdsc_do_request(mdsc, NULL, req);
663 err = ceph_handle_snapdir(req, dentry, err);
664 dentry = ceph_finish_lookup(req, dentry, err);
665 ceph_mdsc_put_request(req); /* will dput(dentry) */
666 dout("lookup result=%p\n", dentry);
671 * If we do a create but get no trace back from the MDS, follow up with
672 * a lookup (the VFS expects us to link up the provided dentry).
674 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
676 struct dentry *result = ceph_lookup(dir, dentry, 0);
678 if (result && !IS_ERR(result)) {
680 * We created the item, then did a lookup, and found
681 * it was already linked to another inode we already
682 * had in our cache (and thus got spliced). To not
683 * confuse VFS (especially when inode is a directory),
684 * we don't link our dentry to that inode, return an
687 * This event should be rare and it happens only when
688 * we talk to old MDS. Recent MDS does not send traceless
689 * reply for request that creates new inode.
694 return PTR_ERR(result);
697 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
698 umode_t mode, dev_t rdev)
700 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
701 struct ceph_mds_client *mdsc = fsc->mdsc;
702 struct ceph_mds_request *req;
703 struct ceph_acls_info acls = {};
706 if (ceph_snap(dir) != CEPH_NOSNAP)
709 err = ceph_pre_init_acls(dir, &mode, &acls);
713 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
714 dir, dentry, mode, rdev);
715 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
720 req->r_dentry = dget(dentry);
722 req->r_locked_dir = dir;
723 req->r_args.mknod.mode = cpu_to_le32(mode);
724 req->r_args.mknod.rdev = cpu_to_le32(rdev);
725 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
726 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
728 req->r_pagelist = acls.pagelist;
729 acls.pagelist = NULL;
731 err = ceph_mdsc_do_request(mdsc, dir, req);
732 if (!err && !req->r_reply_info.head->is_dentry)
733 err = ceph_handle_notrace_create(dir, dentry);
734 ceph_mdsc_put_request(req);
737 ceph_init_inode_acls(d_inode(dentry), &acls);
740 ceph_release_acls_info(&acls);
744 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
747 return ceph_mknod(dir, dentry, mode, 0);
750 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
753 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
754 struct ceph_mds_client *mdsc = fsc->mdsc;
755 struct ceph_mds_request *req;
758 if (ceph_snap(dir) != CEPH_NOSNAP)
761 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
762 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
767 req->r_path2 = kstrdup(dest, GFP_NOFS);
770 ceph_mdsc_put_request(req);
773 req->r_locked_dir = dir;
774 req->r_dentry = dget(dentry);
776 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
777 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
778 err = ceph_mdsc_do_request(mdsc, dir, req);
779 if (!err && !req->r_reply_info.head->is_dentry)
780 err = ceph_handle_notrace_create(dir, dentry);
781 ceph_mdsc_put_request(req);
788 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
790 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
791 struct ceph_mds_client *mdsc = fsc->mdsc;
792 struct ceph_mds_request *req;
793 struct ceph_acls_info acls = {};
797 if (ceph_snap(dir) == CEPH_SNAPDIR) {
798 /* mkdir .snap/foo is a MKSNAP */
799 op = CEPH_MDS_OP_MKSNAP;
800 dout("mksnap dir %p snap '%pd' dn %p\n", dir,
802 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
803 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
804 op = CEPH_MDS_OP_MKDIR;
810 err = ceph_pre_init_acls(dir, &mode, &acls);
814 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
820 req->r_dentry = dget(dentry);
822 req->r_locked_dir = dir;
823 req->r_args.mkdir.mode = cpu_to_le32(mode);
824 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
825 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
827 req->r_pagelist = acls.pagelist;
828 acls.pagelist = NULL;
830 err = ceph_mdsc_do_request(mdsc, dir, req);
832 !req->r_reply_info.head->is_target &&
833 !req->r_reply_info.head->is_dentry)
834 err = ceph_handle_notrace_create(dir, dentry);
835 ceph_mdsc_put_request(req);
838 ceph_init_inode_acls(d_inode(dentry), &acls);
841 ceph_release_acls_info(&acls);
845 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
846 struct dentry *dentry)
848 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
849 struct ceph_mds_client *mdsc = fsc->mdsc;
850 struct ceph_mds_request *req;
853 if (ceph_snap(dir) != CEPH_NOSNAP)
856 dout("link in dir %p old_dentry %p dentry %p\n", dir,
858 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
863 req->r_dentry = dget(dentry);
865 req->r_old_dentry = dget(old_dentry);
866 req->r_locked_dir = dir;
867 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
868 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
869 /* release LINK_SHARED on source inode (mds will lock it) */
870 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
871 err = ceph_mdsc_do_request(mdsc, dir, req);
874 } else if (!req->r_reply_info.head->is_dentry) {
875 ihold(d_inode(old_dentry));
876 d_instantiate(dentry, d_inode(old_dentry));
878 ceph_mdsc_put_request(req);
883 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
884 * looks like the link count will hit 0, drop any other caps (other
885 * than PIN) we don't specifically want (due to the file still being
888 static int drop_caps_for_unlink(struct inode *inode)
890 struct ceph_inode_info *ci = ceph_inode(inode);
891 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
893 spin_lock(&ci->i_ceph_lock);
894 if (inode->i_nlink == 1) {
895 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
896 ci->i_ceph_flags |= CEPH_I_NODELAY;
898 spin_unlock(&ci->i_ceph_lock);
903 * rmdir and unlink are differ only by the metadata op code
905 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
907 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
908 struct ceph_mds_client *mdsc = fsc->mdsc;
909 struct inode *inode = d_inode(dentry);
910 struct ceph_mds_request *req;
914 if (ceph_snap(dir) == CEPH_SNAPDIR) {
915 /* rmdir .snap/foo is RMSNAP */
916 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
917 op = CEPH_MDS_OP_RMSNAP;
918 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
919 dout("unlink/rmdir dir %p dn %p inode %p\n",
921 op = d_is_dir(dentry) ?
922 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
925 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
930 req->r_dentry = dget(dentry);
932 req->r_locked_dir = dir;
933 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
934 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
935 req->r_inode_drop = drop_caps_for_unlink(inode);
936 err = ceph_mdsc_do_request(mdsc, dir, req);
937 if (!err && !req->r_reply_info.head->is_dentry)
939 ceph_mdsc_put_request(req);
944 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
945 struct inode *new_dir, struct dentry *new_dentry)
947 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
948 struct ceph_mds_client *mdsc = fsc->mdsc;
949 struct ceph_mds_request *req;
950 int op = CEPH_MDS_OP_RENAME;
953 if (ceph_snap(old_dir) != ceph_snap(new_dir))
955 if (ceph_snap(old_dir) != CEPH_NOSNAP) {
956 if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
957 op = CEPH_MDS_OP_RENAMESNAP;
961 dout("rename dir %p dentry %p to dir %p dentry %p\n",
962 old_dir, old_dentry, new_dir, new_dentry);
963 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
967 req->r_dentry = dget(new_dentry);
969 req->r_old_dentry = dget(old_dentry);
970 req->r_old_dentry_dir = old_dir;
971 req->r_locked_dir = new_dir;
972 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
973 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
974 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
975 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
976 /* release LINK_RDCACHE on source inode (mds will lock it) */
977 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
978 if (d_really_is_positive(new_dentry))
979 req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry));
980 err = ceph_mdsc_do_request(mdsc, old_dir, req);
981 if (!err && !req->r_reply_info.head->is_dentry) {
983 * Normally d_move() is done by fill_trace (called by
984 * do_request, above). If there is no trace, we need
988 d_move(old_dentry, new_dentry);
990 /* ensure target dentry is invalidated, despite
991 rehashing bug in vfs_rename_dir */
992 ceph_invalidate_dentry_lease(new_dentry);
994 /* d_move screws up sibling dentries' offsets */
995 ceph_dir_clear_complete(old_dir);
996 ceph_dir_clear_complete(new_dir);
999 ceph_mdsc_put_request(req);
1004 * Ensure a dentry lease will no longer revalidate.
1006 void ceph_invalidate_dentry_lease(struct dentry *dentry)
1008 spin_lock(&dentry->d_lock);
1009 dentry->d_time = jiffies;
1010 ceph_dentry(dentry)->lease_shared_gen = 0;
1011 spin_unlock(&dentry->d_lock);
1015 * Check if dentry lease is valid. If not, delete the lease. Try to
1016 * renew if the least is more than half up.
1018 static int dentry_lease_is_valid(struct dentry *dentry)
1020 struct ceph_dentry_info *di;
1021 struct ceph_mds_session *s;
1025 struct ceph_mds_session *session = NULL;
1026 struct inode *dir = NULL;
1029 spin_lock(&dentry->d_lock);
1030 di = ceph_dentry(dentry);
1031 if (di->lease_session) {
1032 s = di->lease_session;
1033 spin_lock(&s->s_gen_ttl_lock);
1036 spin_unlock(&s->s_gen_ttl_lock);
1038 if (di->lease_gen == gen &&
1039 time_before(jiffies, dentry->d_time) &&
1040 time_before(jiffies, ttl)) {
1042 if (di->lease_renew_after &&
1043 time_after(jiffies, di->lease_renew_after)) {
1044 /* we should renew */
1045 dir = d_inode(dentry->d_parent);
1046 session = ceph_get_mds_session(s);
1047 seq = di->lease_seq;
1048 di->lease_renew_after = 0;
1049 di->lease_renew_from = jiffies;
1053 spin_unlock(&dentry->d_lock);
1056 ceph_mdsc_lease_send_msg(session, dir, dentry,
1057 CEPH_MDS_LEASE_RENEW, seq);
1058 ceph_put_mds_session(session);
1060 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1065 * Check if directory-wide content lease/cap is valid.
1067 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1069 struct ceph_inode_info *ci = ceph_inode(dir);
1070 struct ceph_dentry_info *di = ceph_dentry(dentry);
1073 spin_lock(&ci->i_ceph_lock);
1074 if (ci->i_shared_gen == di->lease_shared_gen)
1075 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1076 spin_unlock(&ci->i_ceph_lock);
1077 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1078 dir, (unsigned)ci->i_shared_gen, dentry,
1079 (unsigned)di->lease_shared_gen, valid);
1084 * Check if cached dentry can be trusted.
1086 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1091 if (flags & LOOKUP_RCU)
1094 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
1095 dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
1097 dir = ceph_get_dentry_parent_inode(dentry);
1099 /* always trust cached snapped dentries, snapdir dentry */
1100 if (ceph_snap(dir) != CEPH_NOSNAP) {
1101 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
1102 dentry, d_inode(dentry));
1104 } else if (d_really_is_positive(dentry) &&
1105 ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
1107 } else if (dentry_lease_is_valid(dentry) ||
1108 dir_lease_is_valid(dir, dentry)) {
1109 if (d_really_is_positive(dentry))
1110 valid = ceph_is_any_caps(d_inode(dentry));
1115 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1117 ceph_dentry_lru_touch(dentry);
1119 ceph_dir_clear_complete(dir);
1126 * Release our ceph_dentry_info.
1128 static void ceph_d_release(struct dentry *dentry)
1130 struct ceph_dentry_info *di = ceph_dentry(dentry);
1132 dout("d_release %p\n", dentry);
1133 ceph_dentry_lru_del(dentry);
1134 if (di->lease_session)
1135 ceph_put_mds_session(di->lease_session);
1136 kmem_cache_free(ceph_dentry_cachep, di);
1137 dentry->d_fsdata = NULL;
1140 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1144 * Eventually, we'll want to revalidate snapped metadata
1145 * too... probably...
1151 * When the VFS prunes a dentry from the cache, we need to clear the
1152 * complete flag on the parent directory.
1154 * Called under dentry->d_lock.
1156 static void ceph_d_prune(struct dentry *dentry)
1158 dout("ceph_d_prune %p\n", dentry);
1160 /* do we have a valid parent? */
1161 if (IS_ROOT(dentry))
1164 /* if we are not hashed, we don't affect dir's completeness */
1165 if (d_unhashed(dentry))
1169 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1170 * cleared until d_release
1172 ceph_dir_clear_complete(d_inode(dentry->d_parent));
1176 * read() on a dir. This weird interface hack only works if mounted
1177 * with '-o dirstat'.
1179 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1182 struct ceph_file_info *cf = file->private_data;
1183 struct inode *inode = file_inode(file);
1184 struct ceph_inode_info *ci = ceph_inode(inode);
1186 const int bufsize = 1024;
1188 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1191 if (!cf->dir_info) {
1192 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1196 snprintf(cf->dir_info, bufsize,
1199 " subdirs: %20lld\n"
1200 "rentries: %20lld\n"
1202 " rsubdirs: %20lld\n"
1204 "rctime: %10ld.%09ld\n",
1205 ci->i_files + ci->i_subdirs,
1208 ci->i_rfiles + ci->i_rsubdirs,
1212 (long)ci->i_rctime.tv_sec,
1213 (long)ci->i_rctime.tv_nsec);
1216 if (*ppos >= cf->dir_info_len)
1218 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1219 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1222 *ppos += (size - left);
1227 * an fsync() on a dir will wait for any uncommitted directory
1228 * operations to commit.
1230 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1233 struct inode *inode = file_inode(file);
1234 struct ceph_inode_info *ci = ceph_inode(inode);
1235 struct list_head *head = &ci->i_unsafe_dirops;
1236 struct ceph_mds_request *req;
1240 dout("dir_fsync %p\n", inode);
1241 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1244 mutex_lock(&inode->i_mutex);
1246 spin_lock(&ci->i_unsafe_lock);
1247 if (list_empty(head))
1250 req = list_entry(head->prev,
1251 struct ceph_mds_request, r_unsafe_dir_item);
1252 last_tid = req->r_tid;
1255 ceph_mdsc_get_request(req);
1256 spin_unlock(&ci->i_unsafe_lock);
1258 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1259 inode, req->r_tid, last_tid);
1260 if (req->r_timeout) {
1261 unsigned long time_left = wait_for_completion_timeout(
1262 &req->r_safe_completion,
1267 ret = -EIO; /* timed out */
1269 wait_for_completion(&req->r_safe_completion);
1271 ceph_mdsc_put_request(req);
1273 spin_lock(&ci->i_unsafe_lock);
1274 if (ret || list_empty(head))
1276 req = list_entry(head->next,
1277 struct ceph_mds_request, r_unsafe_dir_item);
1278 } while (req->r_tid < last_tid);
1280 spin_unlock(&ci->i_unsafe_lock);
1281 mutex_unlock(&inode->i_mutex);
1287 * We maintain a private dentry LRU.
1289 * FIXME: this needs to be changed to a per-mds lru to be useful.
1291 void ceph_dentry_lru_add(struct dentry *dn)
1293 struct ceph_dentry_info *di = ceph_dentry(dn);
1294 struct ceph_mds_client *mdsc;
1296 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
1297 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1298 spin_lock(&mdsc->dentry_lru_lock);
1299 list_add_tail(&di->lru, &mdsc->dentry_lru);
1301 spin_unlock(&mdsc->dentry_lru_lock);
1304 void ceph_dentry_lru_touch(struct dentry *dn)
1306 struct ceph_dentry_info *di = ceph_dentry(dn);
1307 struct ceph_mds_client *mdsc;
1309 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
1311 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1312 spin_lock(&mdsc->dentry_lru_lock);
1313 list_move_tail(&di->lru, &mdsc->dentry_lru);
1314 spin_unlock(&mdsc->dentry_lru_lock);
1317 void ceph_dentry_lru_del(struct dentry *dn)
1319 struct ceph_dentry_info *di = ceph_dentry(dn);
1320 struct ceph_mds_client *mdsc;
1322 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
1323 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1324 spin_lock(&mdsc->dentry_lru_lock);
1325 list_del_init(&di->lru);
1327 spin_unlock(&mdsc->dentry_lru_lock);
1331 * Return name hash for a given dentry. This is dependent on
1332 * the parent directory's hash function.
1334 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1336 struct ceph_inode_info *dci = ceph_inode(dir);
1338 switch (dci->i_dir_layout.dl_dir_hash) {
1339 case 0: /* for backward compat */
1340 case CEPH_STR_HASH_LINUX:
1341 return dn->d_name.hash;
1344 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1345 dn->d_name.name, dn->d_name.len);
1349 const struct file_operations ceph_dir_fops = {
1350 .read = ceph_read_dir,
1351 .iterate = ceph_readdir,
1352 .llseek = ceph_dir_llseek,
1354 .release = ceph_release,
1355 .unlocked_ioctl = ceph_ioctl,
1356 .fsync = ceph_dir_fsync,
1359 const struct file_operations ceph_snapdir_fops = {
1360 .iterate = ceph_readdir,
1361 .llseek = ceph_dir_llseek,
1363 .release = ceph_release,
1366 const struct inode_operations ceph_dir_iops = {
1367 .lookup = ceph_lookup,
1368 .permission = ceph_permission,
1369 .getattr = ceph_getattr,
1370 .setattr = ceph_setattr,
1371 .setxattr = ceph_setxattr,
1372 .getxattr = ceph_getxattr,
1373 .listxattr = ceph_listxattr,
1374 .removexattr = ceph_removexattr,
1375 .get_acl = ceph_get_acl,
1376 .set_acl = ceph_set_acl,
1377 .mknod = ceph_mknod,
1378 .symlink = ceph_symlink,
1379 .mkdir = ceph_mkdir,
1381 .unlink = ceph_unlink,
1382 .rmdir = ceph_unlink,
1383 .rename = ceph_rename,
1384 .create = ceph_create,
1385 .atomic_open = ceph_atomic_open,
1388 const struct inode_operations ceph_snapdir_iops = {
1389 .lookup = ceph_lookup,
1390 .permission = ceph_permission,
1391 .getattr = ceph_getattr,
1392 .mkdir = ceph_mkdir,
1393 .rmdir = ceph_unlink,
1394 .rename = ceph_rename,
1397 const struct dentry_operations ceph_dentry_ops = {
1398 .d_revalidate = ceph_d_revalidate,
1399 .d_release = ceph_d_release,
1400 .d_prune = ceph_d_prune,
1403 const struct dentry_operations ceph_snapdir_dentry_ops = {
1404 .d_revalidate = ceph_snapdir_d_revalidate,
1405 .d_release = ceph_d_release,
1408 const struct dentry_operations ceph_snap_dentry_ops = {
1409 .d_release = ceph_d_release,
1410 .d_prune = ceph_d_prune,