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 inode_operations ceph_dir_iops;
30 const struct file_operations ceph_dir_fops;
31 const struct dentry_operations ceph_dentry_ops;
34 * Initialize ceph dentry state.
36 int ceph_init_dentry(struct dentry *dentry)
38 struct ceph_dentry_info *di;
43 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
45 return -ENOMEM; /* oh well */
47 spin_lock(&dentry->d_lock);
48 if (dentry->d_fsdata) {
50 kmem_cache_free(ceph_dentry_cachep, di);
54 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
55 d_set_d_op(dentry, &ceph_dentry_ops);
56 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
57 d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
59 d_set_d_op(dentry, &ceph_snap_dentry_ops);
62 di->lease_session = NULL;
63 dentry->d_time = jiffies;
64 /* avoid reordering d_fsdata setup so that the check above is safe */
66 dentry->d_fsdata = di;
67 ceph_dentry_lru_add(dentry);
69 spin_unlock(&dentry->d_lock);
73 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
75 struct inode *inode = NULL;
80 spin_lock(&dentry->d_lock);
81 if (!IS_ROOT(dentry)) {
82 inode = dentry->d_parent->d_inode;
85 spin_unlock(&dentry->d_lock);
91 * for readdir, we encode the directory frag and offset within that
94 static unsigned fpos_frag(loff_t p)
98 static unsigned fpos_off(loff_t p)
100 return p & 0xffffffff;
103 static int fpos_cmp(loff_t l, loff_t r)
105 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
108 return (int)(fpos_off(l) - fpos_off(r));
112 * When possible, we try to satisfy a readdir by peeking at the
113 * dcache. We make this work by carefully ordering dentries on
114 * d_u.d_child when we initially get results back from the MDS, and
115 * falling back to a "normal" sync readdir if any dentries in the dir
118 * Complete dir indicates that we have all dentries in the dir. It is
119 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
120 * the MDS if/when the directory is modified).
122 static int __dcache_readdir(struct file *file, struct dir_context *ctx)
124 struct ceph_file_info *fi = file->private_data;
125 struct dentry *parent = file->f_dentry;
126 struct inode *dir = parent->d_inode;
128 struct dentry *dentry, *last;
129 struct ceph_dentry_info *di;
132 /* claim ref on last dentry we returned */
136 dout("__dcache_readdir %p at %llu (last %p)\n", dir, ctx->pos,
139 spin_lock(&parent->d_lock);
141 /* start at beginning? */
142 if (ctx->pos == 2 || last == NULL ||
143 ctx->pos < ceph_dentry(last)->offset) {
144 if (list_empty(&parent->d_subdirs))
146 p = parent->d_subdirs.prev;
147 dout(" initial p %p/%p\n", p->prev, p->next);
149 p = last->d_u.d_child.prev;
153 dentry = list_entry(p, struct dentry, d_u.d_child);
154 di = ceph_dentry(dentry);
156 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
157 d_unhashed(dentry) ? "!hashed" : "hashed",
158 parent->d_subdirs.prev, parent->d_subdirs.next);
159 if (p == &parent->d_subdirs) {
160 fi->flags |= CEPH_F_ATEND;
163 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
164 if (!d_unhashed(dentry) && dentry->d_inode &&
165 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
166 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
167 fpos_cmp(ctx->pos, di->offset) <= 0)
169 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
170 dentry->d_name.len, dentry->d_name.name, di->offset,
171 ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
172 !dentry->d_inode ? " null" : "");
173 spin_unlock(&dentry->d_lock);
175 dentry = list_entry(p, struct dentry, d_u.d_child);
176 di = ceph_dentry(dentry);
180 spin_unlock(&dentry->d_lock);
181 spin_unlock(&parent->d_lock);
183 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos,
184 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
185 ctx->pos = di->offset;
186 if (!dir_emit(ctx, dentry->d_name.name,
188 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
189 dentry->d_inode->i_mode >> 12)) {
191 /* remember our position */
193 fi->next_offset = di->offset;
205 /* make sure a dentry wasn't dropped while we didn't have parent lock */
206 if (!ceph_dir_is_complete(dir)) {
207 dout(" lost dir complete on %p; falling back to mds\n", dir);
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;
255 const int max_entries = fsc->mount_options->max_readdir;
256 const int max_bytes = fsc->mount_options->max_readdir_bytes;
258 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
259 if (fi->flags & CEPH_F_ATEND)
262 /* always start with . and .. */
264 /* note dir version at start of readdir so we can tell
265 * if any dentries get dropped */
266 fi->dir_release_count = atomic_read(&ci->i_release_count);
268 dout("readdir off 0 -> '.'\n");
269 if (!dir_emit(ctx, ".", 1,
270 ceph_translate_ino(inode->i_sb, inode->i_ino),
271 inode->i_mode >> 12))
277 ino_t ino = parent_ino(file->f_dentry);
278 dout("readdir off 1 -> '..'\n");
279 if (!dir_emit(ctx, "..", 2,
280 ceph_translate_ino(inode->i_sb, ino),
281 inode->i_mode >> 12))
287 /* can we use the dcache? */
288 spin_lock(&ci->i_ceph_lock);
289 if ((ctx->pos == 2 || fi->dentry) &&
290 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
291 ceph_snap(inode) != CEPH_SNAPDIR &&
292 __ceph_dir_is_complete(ci) &&
293 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
294 spin_unlock(&ci->i_ceph_lock);
295 err = __dcache_readdir(file, ctx);
299 spin_unlock(&ci->i_ceph_lock);
302 err = note_last_dentry(fi, fi->dentry->d_name.name,
303 fi->dentry->d_name.len);
310 /* proceed with a normal readdir */
313 /* do we have the correct frag content buffered? */
314 if (fi->frag != frag || fi->last_readdir == NULL) {
315 struct ceph_mds_request *req;
316 int op = ceph_snap(inode) == CEPH_SNAPDIR ?
317 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
319 /* discard old result, if any */
320 if (fi->last_readdir) {
321 ceph_mdsc_put_request(fi->last_readdir);
322 fi->last_readdir = NULL;
325 /* requery frag tree, as the frag topology may have changed */
326 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);
328 dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
329 ceph_vinop(inode), frag, fi->last_name);
330 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
333 req->r_inode = inode;
335 req->r_dentry = dget(file->f_dentry);
336 /* hints to request -> mds selection code */
337 req->r_direct_mode = USE_AUTH_MDS;
338 req->r_direct_hash = ceph_frag_value(frag);
339 req->r_direct_is_hash = true;
340 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
341 req->r_readdir_offset = fi->next_offset;
342 req->r_args.readdir.frag = cpu_to_le32(frag);
343 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
344 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
345 req->r_num_caps = max_entries + 1;
346 err = ceph_mdsc_do_request(mdsc, NULL, req);
348 ceph_mdsc_put_request(req);
351 dout("readdir got and parsed readdir result=%d"
352 " on frag %x, end=%d, complete=%d\n", err, frag,
353 (int)req->r_reply_info.dir_end,
354 (int)req->r_reply_info.dir_complete);
356 if (!req->r_did_prepopulate) {
357 dout("readdir !did_prepopulate");
358 /* preclude from marking dir complete */
359 fi->dir_release_count--;
362 /* note next offset and last dentry name */
363 rinfo = &req->r_reply_info;
364 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
365 frag = le32_to_cpu(rinfo->dir_dir->frag);
366 if (ceph_frag_is_leftmost(frag))
370 off = fi->next_offset;
372 fi->offset = fi->next_offset;
373 fi->last_readdir = req;
376 if (req->r_reply_info.dir_end) {
377 kfree(fi->last_name);
378 fi->last_name = NULL;
379 if (ceph_frag_is_rightmost(frag))
384 err = note_last_dentry(fi,
385 rinfo->dir_dname[rinfo->dir_nr-1],
386 rinfo->dir_dname_len[rinfo->dir_nr-1]);
389 fi->next_offset += rinfo->dir_nr;
393 rinfo = &fi->last_readdir->r_reply_info;
394 dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
395 rinfo->dir_nr, off, fi->offset);
397 ctx->pos = ceph_make_fpos(frag, off);
398 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
399 struct ceph_mds_reply_inode *in =
400 rinfo->dir_in[off - fi->offset].in;
401 struct ceph_vino vino;
404 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
405 off, off - fi->offset, rinfo->dir_nr, ctx->pos,
406 rinfo->dir_dname_len[off - fi->offset],
407 rinfo->dir_dname[off - fi->offset], in);
409 ftype = le32_to_cpu(in->mode) >> 12;
410 vino.ino = le64_to_cpu(in->ino);
411 vino.snap = le64_to_cpu(in->snapid);
412 ino = ceph_vino_to_ino(vino);
414 rinfo->dir_dname[off - fi->offset],
415 rinfo->dir_dname_len[off - fi->offset],
416 ceph_translate_ino(inode->i_sb, ino), ftype)) {
417 dout("filldir stopping us...\n");
425 ceph_mdsc_put_request(fi->last_readdir);
426 fi->last_readdir = NULL;
431 if (!ceph_frag_is_rightmost(frag)) {
432 frag = ceph_frag_next(frag);
434 ctx->pos = ceph_make_fpos(frag, off);
435 dout("readdir next frag is %x\n", frag);
438 fi->flags |= CEPH_F_ATEND;
441 * if dir_release_count still matches the dir, no dentries
442 * were released during the whole readdir, and we should have
443 * the complete dir contents in our cache.
445 spin_lock(&ci->i_ceph_lock);
446 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
447 dout(" marking %p complete\n", inode);
448 __ceph_dir_set_complete(ci, fi->dir_release_count);
449 ci->i_max_offset = ctx->pos;
451 spin_unlock(&ci->i_ceph_lock);
453 dout("readdir %p file %p done.\n", inode, file);
457 static void reset_readdir(struct ceph_file_info *fi)
459 if (fi->last_readdir) {
460 ceph_mdsc_put_request(fi->last_readdir);
461 fi->last_readdir = NULL;
463 kfree(fi->last_name);
464 fi->last_name = NULL;
465 fi->next_offset = 2; /* compensate for . and .. */
470 fi->flags &= ~CEPH_F_ATEND;
473 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
475 struct ceph_file_info *fi = file->private_data;
476 struct inode *inode = file->f_mapping->host;
477 loff_t old_offset = offset;
480 mutex_lock(&inode->i_mutex);
484 offset += inode->i_size + 2; /* FIXME */
487 offset += file->f_pos;
494 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
495 if (offset != file->f_pos) {
496 file->f_pos = offset;
498 fi->flags &= ~CEPH_F_ATEND;
503 * discard buffered readdir content on seekdir(0), or
504 * seek to new frag, or seek prior to current chunk.
507 fpos_frag(offset) != fpos_frag(old_offset) ||
508 fpos_off(offset) < fi->offset) {
509 dout("dir_llseek dropping %p content\n", file);
513 /* bump dir_release_count if we did a forward seek */
514 if (offset > old_offset)
515 fi->dir_release_count--;
518 mutex_unlock(&inode->i_mutex);
523 * Handle lookups for the hidden .snap directory.
525 int ceph_handle_snapdir(struct ceph_mds_request *req,
526 struct dentry *dentry, int err)
528 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
529 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
532 if (err == -ENOENT &&
533 ceph_snap(parent) == CEPH_NOSNAP &&
534 strcmp(dentry->d_name.name,
535 fsc->mount_options->snapdir_name) == 0) {
536 struct inode *inode = ceph_get_snapdir(parent);
537 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
538 dentry, dentry->d_name.len, dentry->d_name.name, inode);
539 BUG_ON(!d_unhashed(dentry));
540 d_add(dentry, inode);
547 * Figure out final result of a lookup/open request.
549 * Mainly, make sure we return the final req->r_dentry (if it already
550 * existed) in place of the original VFS-provided dentry when they
553 * Gracefully handle the case where the MDS replies with -ENOENT and
554 * no trace (which it may do, at its discretion, e.g., if it doesn't
555 * care to issue a lease on the negative dentry).
557 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
558 struct dentry *dentry, int err)
560 if (err == -ENOENT) {
563 if (!req->r_reply_info.head->is_dentry) {
564 dout("ENOENT and no trace, dentry %p inode %p\n",
565 dentry, dentry->d_inode);
566 if (dentry->d_inode) {
575 dentry = ERR_PTR(err);
576 else if (dentry != req->r_dentry)
577 dentry = dget(req->r_dentry); /* we got spliced */
583 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
585 return ceph_ino(inode) == CEPH_INO_ROOT &&
586 strncmp(dentry->d_name.name, ".ceph", 5) == 0;
590 * Look up a single dir entry. If there is a lookup intent, inform
591 * the MDS so that it gets our 'caps wanted' value in a single op.
593 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
596 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
597 struct ceph_mds_client *mdsc = fsc->mdsc;
598 struct ceph_mds_request *req;
602 dout("lookup %p dentry %p '%.*s'\n",
603 dir, dentry, dentry->d_name.len, dentry->d_name.name);
605 if (dentry->d_name.len > NAME_MAX)
606 return ERR_PTR(-ENAMETOOLONG);
608 err = ceph_init_dentry(dentry);
612 /* can we conclude ENOENT locally? */
613 if (dentry->d_inode == NULL) {
614 struct ceph_inode_info *ci = ceph_inode(dir);
615 struct ceph_dentry_info *di = ceph_dentry(dentry);
617 spin_lock(&ci->i_ceph_lock);
618 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
619 if (strncmp(dentry->d_name.name,
620 fsc->mount_options->snapdir_name,
621 dentry->d_name.len) &&
622 !is_root_ceph_dentry(dir, dentry) &&
623 __ceph_dir_is_complete(ci) &&
624 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
625 spin_unlock(&ci->i_ceph_lock);
626 dout(" dir %p complete, -ENOENT\n", dir);
628 di->lease_shared_gen = ci->i_shared_gen;
631 spin_unlock(&ci->i_ceph_lock);
634 op = ceph_snap(dir) == CEPH_SNAPDIR ?
635 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
636 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
638 return ERR_CAST(req);
639 req->r_dentry = dget(dentry);
641 /* we only need inode linkage */
642 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
643 req->r_locked_dir = dir;
644 err = ceph_mdsc_do_request(mdsc, NULL, req);
645 err = ceph_handle_snapdir(req, dentry, err);
646 dentry = ceph_finish_lookup(req, dentry, err);
647 ceph_mdsc_put_request(req); /* will dput(dentry) */
648 dout("lookup result=%p\n", dentry);
653 * If we do a create but get no trace back from the MDS, follow up with
654 * a lookup (the VFS expects us to link up the provided dentry).
656 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
658 struct dentry *result = ceph_lookup(dir, dentry, 0);
660 if (result && !IS_ERR(result)) {
662 * We created the item, then did a lookup, and found
663 * it was already linked to another inode we already
664 * had in our cache (and thus got spliced). Link our
665 * dentry to that inode, but don't hash it, just in
666 * case the VFS wants to dereference it.
668 BUG_ON(!result->d_inode);
669 d_instantiate(dentry, result->d_inode);
672 return PTR_ERR(result);
675 static int ceph_mknod(struct inode *dir, struct dentry *dentry,
676 umode_t mode, dev_t rdev)
678 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
679 struct ceph_mds_client *mdsc = fsc->mdsc;
680 struct ceph_mds_request *req;
683 if (ceph_snap(dir) != CEPH_NOSNAP)
686 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
687 dir, dentry, mode, rdev);
688 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
693 req->r_dentry = dget(dentry);
695 req->r_locked_dir = dir;
696 req->r_args.mknod.mode = cpu_to_le32(mode);
697 req->r_args.mknod.rdev = cpu_to_le32(rdev);
698 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
699 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
700 err = ceph_mdsc_do_request(mdsc, dir, req);
701 if (!err && !req->r_reply_info.head->is_dentry)
702 err = ceph_handle_notrace_create(dir, dentry);
703 ceph_mdsc_put_request(req);
706 ceph_init_acl(dentry, dentry->d_inode, dir);
712 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
715 return ceph_mknod(dir, dentry, mode, 0);
718 static int ceph_symlink(struct inode *dir, struct dentry *dentry,
721 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
722 struct ceph_mds_client *mdsc = fsc->mdsc;
723 struct ceph_mds_request *req;
726 if (ceph_snap(dir) != CEPH_NOSNAP)
729 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
730 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
735 req->r_dentry = dget(dentry);
737 req->r_path2 = kstrdup(dest, GFP_NOFS);
738 req->r_locked_dir = dir;
739 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
740 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
741 err = ceph_mdsc_do_request(mdsc, dir, req);
742 if (!err && !req->r_reply_info.head->is_dentry)
743 err = ceph_handle_notrace_create(dir, dentry);
744 ceph_mdsc_put_request(req);
746 ceph_init_acl(dentry, dentry->d_inode, dir);
752 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
754 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
755 struct ceph_mds_client *mdsc = fsc->mdsc;
756 struct ceph_mds_request *req;
760 if (ceph_snap(dir) == CEPH_SNAPDIR) {
761 /* mkdir .snap/foo is a MKSNAP */
762 op = CEPH_MDS_OP_MKSNAP;
763 dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
764 dentry->d_name.len, dentry->d_name.name, dentry);
765 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
766 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
767 op = CEPH_MDS_OP_MKDIR;
771 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
777 req->r_dentry = dget(dentry);
779 req->r_locked_dir = dir;
780 req->r_args.mkdir.mode = cpu_to_le32(mode);
781 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
782 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
783 err = ceph_mdsc_do_request(mdsc, dir, req);
784 if (!err && !req->r_reply_info.head->is_dentry)
785 err = ceph_handle_notrace_create(dir, dentry);
786 ceph_mdsc_put_request(req);
789 ceph_init_acl(dentry, dentry->d_inode, dir);
795 static int ceph_link(struct dentry *old_dentry, struct inode *dir,
796 struct dentry *dentry)
798 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
799 struct ceph_mds_client *mdsc = fsc->mdsc;
800 struct ceph_mds_request *req;
803 if (ceph_snap(dir) != CEPH_NOSNAP)
806 dout("link in dir %p old_dentry %p dentry %p\n", dir,
808 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
813 req->r_dentry = dget(dentry);
815 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
816 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
817 req->r_locked_dir = dir;
818 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
819 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
820 /* release LINK_SHARED on source inode (mds will lock it) */
821 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
822 err = ceph_mdsc_do_request(mdsc, dir, req);
825 } else if (!req->r_reply_info.head->is_dentry) {
826 ihold(old_dentry->d_inode);
827 d_instantiate(dentry, old_dentry->d_inode);
829 ceph_mdsc_put_request(req);
834 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it
835 * looks like the link count will hit 0, drop any other caps (other
836 * than PIN) we don't specifically want (due to the file still being
839 static int drop_caps_for_unlink(struct inode *inode)
841 struct ceph_inode_info *ci = ceph_inode(inode);
842 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
844 spin_lock(&ci->i_ceph_lock);
845 if (inode->i_nlink == 1) {
846 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
847 ci->i_ceph_flags |= CEPH_I_NODELAY;
849 spin_unlock(&ci->i_ceph_lock);
854 * rmdir and unlink are differ only by the metadata op code
856 static int ceph_unlink(struct inode *dir, struct dentry *dentry)
858 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
859 struct ceph_mds_client *mdsc = fsc->mdsc;
860 struct inode *inode = dentry->d_inode;
861 struct ceph_mds_request *req;
865 if (ceph_snap(dir) == CEPH_SNAPDIR) {
866 /* rmdir .snap/foo is RMSNAP */
867 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
868 dentry->d_name.name, dentry);
869 op = CEPH_MDS_OP_RMSNAP;
870 } else if (ceph_snap(dir) == CEPH_NOSNAP) {
871 dout("unlink/rmdir dir %p dn %p inode %p\n",
873 op = S_ISDIR(dentry->d_inode->i_mode) ?
874 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
877 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
882 req->r_dentry = dget(dentry);
884 req->r_locked_dir = dir;
885 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
886 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
887 req->r_inode_drop = drop_caps_for_unlink(inode);
888 err = ceph_mdsc_do_request(mdsc, dir, req);
889 if (!err && !req->r_reply_info.head->is_dentry)
891 ceph_mdsc_put_request(req);
896 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
897 struct inode *new_dir, struct dentry *new_dentry)
899 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
900 struct ceph_mds_client *mdsc = fsc->mdsc;
901 struct ceph_mds_request *req;
904 if (ceph_snap(old_dir) != ceph_snap(new_dir))
906 if (ceph_snap(old_dir) != CEPH_NOSNAP ||
907 ceph_snap(new_dir) != CEPH_NOSNAP)
909 dout("rename dir %p dentry %p to dir %p dentry %p\n",
910 old_dir, old_dentry, new_dir, new_dentry);
911 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
914 req->r_dentry = dget(new_dentry);
916 req->r_old_dentry = dget(old_dentry);
917 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
918 req->r_locked_dir = new_dir;
919 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
920 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
921 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
922 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
923 /* release LINK_RDCACHE on source inode (mds will lock it) */
924 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
925 if (new_dentry->d_inode)
926 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
927 err = ceph_mdsc_do_request(mdsc, old_dir, req);
928 if (!err && !req->r_reply_info.head->is_dentry) {
930 * Normally d_move() is done by fill_trace (called by
931 * do_request, above). If there is no trace, we need
935 /* d_move screws up d_subdirs order */
936 ceph_dir_clear_complete(new_dir);
938 d_move(old_dentry, new_dentry);
940 /* ensure target dentry is invalidated, despite
941 rehashing bug in vfs_rename_dir */
942 ceph_invalidate_dentry_lease(new_dentry);
944 ceph_mdsc_put_request(req);
949 * Ensure a dentry lease will no longer revalidate.
951 void ceph_invalidate_dentry_lease(struct dentry *dentry)
953 spin_lock(&dentry->d_lock);
954 dentry->d_time = jiffies;
955 ceph_dentry(dentry)->lease_shared_gen = 0;
956 spin_unlock(&dentry->d_lock);
960 * Check if dentry lease is valid. If not, delete the lease. Try to
961 * renew if the least is more than half up.
963 static int dentry_lease_is_valid(struct dentry *dentry)
965 struct ceph_dentry_info *di;
966 struct ceph_mds_session *s;
970 struct ceph_mds_session *session = NULL;
971 struct inode *dir = NULL;
974 spin_lock(&dentry->d_lock);
975 di = ceph_dentry(dentry);
976 if (di->lease_session) {
977 s = di->lease_session;
978 spin_lock(&s->s_gen_ttl_lock);
981 spin_unlock(&s->s_gen_ttl_lock);
983 if (di->lease_gen == gen &&
984 time_before(jiffies, dentry->d_time) &&
985 time_before(jiffies, ttl)) {
987 if (di->lease_renew_after &&
988 time_after(jiffies, di->lease_renew_after)) {
989 /* we should renew */
990 dir = dentry->d_parent->d_inode;
991 session = ceph_get_mds_session(s);
993 di->lease_renew_after = 0;
994 di->lease_renew_from = jiffies;
998 spin_unlock(&dentry->d_lock);
1001 ceph_mdsc_lease_send_msg(session, dir, dentry,
1002 CEPH_MDS_LEASE_RENEW, seq);
1003 ceph_put_mds_session(session);
1005 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
1010 * Check if directory-wide content lease/cap is valid.
1012 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
1014 struct ceph_inode_info *ci = ceph_inode(dir);
1015 struct ceph_dentry_info *di = ceph_dentry(dentry);
1018 spin_lock(&ci->i_ceph_lock);
1019 if (ci->i_shared_gen == di->lease_shared_gen)
1020 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1021 spin_unlock(&ci->i_ceph_lock);
1022 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
1023 dir, (unsigned)ci->i_shared_gen, dentry,
1024 (unsigned)di->lease_shared_gen, valid);
1029 * Check if cached dentry can be trusted.
1031 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
1036 if (flags & LOOKUP_RCU)
1039 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
1040 dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
1041 ceph_dentry(dentry)->offset);
1043 dir = ceph_get_dentry_parent_inode(dentry);
1045 /* always trust cached snapped dentries, snapdir dentry */
1046 if (ceph_snap(dir) != CEPH_NOSNAP) {
1047 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
1048 dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1050 } else if (dentry->d_inode &&
1051 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
1053 } else if (dentry_lease_is_valid(dentry) ||
1054 dir_lease_is_valid(dir, dentry)) {
1055 if (dentry->d_inode)
1056 valid = ceph_is_any_caps(dentry->d_inode);
1061 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1063 ceph_dentry_lru_touch(dentry);
1065 ceph_dir_clear_complete(dir);
1073 * Release our ceph_dentry_info.
1075 static void ceph_d_release(struct dentry *dentry)
1077 struct ceph_dentry_info *di = ceph_dentry(dentry);
1079 dout("d_release %p\n", dentry);
1080 ceph_dentry_lru_del(dentry);
1081 if (di->lease_session)
1082 ceph_put_mds_session(di->lease_session);
1083 kmem_cache_free(ceph_dentry_cachep, di);
1084 dentry->d_fsdata = NULL;
1087 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
1091 * Eventually, we'll want to revalidate snapped metadata
1092 * too... probably...
1098 * When the VFS prunes a dentry from the cache, we need to clear the
1099 * complete flag on the parent directory.
1101 * Called under dentry->d_lock.
1103 static void ceph_d_prune(struct dentry *dentry)
1105 dout("ceph_d_prune %p\n", dentry);
1107 /* do we have a valid parent? */
1108 if (IS_ROOT(dentry))
1111 /* if we are not hashed, we don't affect dir's completeness */
1112 if (d_unhashed(dentry))
1116 * we hold d_lock, so d_parent is stable, and d_fsdata is never
1117 * cleared until d_release
1119 ceph_dir_clear_complete(dentry->d_parent->d_inode);
1123 * read() on a dir. This weird interface hack only works if mounted
1124 * with '-o dirstat'.
1126 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
1129 struct ceph_file_info *cf = file->private_data;
1130 struct inode *inode = file_inode(file);
1131 struct ceph_inode_info *ci = ceph_inode(inode);
1133 const int bufsize = 1024;
1135 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
1138 if (!cf->dir_info) {
1139 cf->dir_info = kmalloc(bufsize, GFP_NOFS);
1143 snprintf(cf->dir_info, bufsize,
1146 " subdirs: %20lld\n"
1147 "rentries: %20lld\n"
1149 " rsubdirs: %20lld\n"
1151 "rctime: %10ld.%09ld\n",
1152 ci->i_files + ci->i_subdirs,
1155 ci->i_rfiles + ci->i_rsubdirs,
1159 (long)ci->i_rctime.tv_sec,
1160 (long)ci->i_rctime.tv_nsec);
1163 if (*ppos >= cf->dir_info_len)
1165 size = min_t(unsigned, size, cf->dir_info_len-*ppos);
1166 left = copy_to_user(buf, cf->dir_info + *ppos, size);
1169 *ppos += (size - left);
1174 * an fsync() on a dir will wait for any uncommitted directory
1175 * operations to commit.
1177 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
1180 struct inode *inode = file_inode(file);
1181 struct ceph_inode_info *ci = ceph_inode(inode);
1182 struct list_head *head = &ci->i_unsafe_dirops;
1183 struct ceph_mds_request *req;
1187 dout("dir_fsync %p\n", inode);
1188 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
1191 mutex_lock(&inode->i_mutex);
1193 spin_lock(&ci->i_unsafe_lock);
1194 if (list_empty(head))
1197 req = list_entry(head->prev,
1198 struct ceph_mds_request, r_unsafe_dir_item);
1199 last_tid = req->r_tid;
1202 ceph_mdsc_get_request(req);
1203 spin_unlock(&ci->i_unsafe_lock);
1205 dout("dir_fsync %p wait on tid %llu (until %llu)\n",
1206 inode, req->r_tid, last_tid);
1207 if (req->r_timeout) {
1208 ret = wait_for_completion_timeout(
1209 &req->r_safe_completion, req->r_timeout);
1213 ret = -EIO; /* timed out */
1215 wait_for_completion(&req->r_safe_completion);
1217 ceph_mdsc_put_request(req);
1219 spin_lock(&ci->i_unsafe_lock);
1220 if (ret || list_empty(head))
1222 req = list_entry(head->next,
1223 struct ceph_mds_request, r_unsafe_dir_item);
1224 } while (req->r_tid < last_tid);
1226 spin_unlock(&ci->i_unsafe_lock);
1227 mutex_unlock(&inode->i_mutex);
1233 * We maintain a private dentry LRU.
1235 * FIXME: this needs to be changed to a per-mds lru to be useful.
1237 void ceph_dentry_lru_add(struct dentry *dn)
1239 struct ceph_dentry_info *di = ceph_dentry(dn);
1240 struct ceph_mds_client *mdsc;
1242 dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
1243 dn->d_name.len, dn->d_name.name);
1244 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1245 spin_lock(&mdsc->dentry_lru_lock);
1246 list_add_tail(&di->lru, &mdsc->dentry_lru);
1248 spin_unlock(&mdsc->dentry_lru_lock);
1251 void ceph_dentry_lru_touch(struct dentry *dn)
1253 struct ceph_dentry_info *di = ceph_dentry(dn);
1254 struct ceph_mds_client *mdsc;
1256 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
1257 dn->d_name.len, dn->d_name.name, di->offset);
1258 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1259 spin_lock(&mdsc->dentry_lru_lock);
1260 list_move_tail(&di->lru, &mdsc->dentry_lru);
1261 spin_unlock(&mdsc->dentry_lru_lock);
1264 void ceph_dentry_lru_del(struct dentry *dn)
1266 struct ceph_dentry_info *di = ceph_dentry(dn);
1267 struct ceph_mds_client *mdsc;
1269 dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
1270 dn->d_name.len, dn->d_name.name);
1271 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
1272 spin_lock(&mdsc->dentry_lru_lock);
1273 list_del_init(&di->lru);
1275 spin_unlock(&mdsc->dentry_lru_lock);
1279 * Return name hash for a given dentry. This is dependent on
1280 * the parent directory's hash function.
1282 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
1284 struct ceph_inode_info *dci = ceph_inode(dir);
1286 switch (dci->i_dir_layout.dl_dir_hash) {
1287 case 0: /* for backward compat */
1288 case CEPH_STR_HASH_LINUX:
1289 return dn->d_name.hash;
1292 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
1293 dn->d_name.name, dn->d_name.len);
1297 const struct file_operations ceph_dir_fops = {
1298 .read = ceph_read_dir,
1299 .iterate = ceph_readdir,
1300 .llseek = ceph_dir_llseek,
1302 .release = ceph_release,
1303 .unlocked_ioctl = ceph_ioctl,
1304 .fsync = ceph_dir_fsync,
1307 const struct inode_operations ceph_dir_iops = {
1308 .lookup = ceph_lookup,
1309 .permission = ceph_permission,
1310 .getattr = ceph_getattr,
1311 .setattr = ceph_setattr,
1312 .setxattr = ceph_setxattr,
1313 .getxattr = ceph_getxattr,
1314 .listxattr = ceph_listxattr,
1315 .removexattr = ceph_removexattr,
1316 .get_acl = ceph_get_acl,
1317 .set_acl = ceph_set_acl,
1318 .mknod = ceph_mknod,
1319 .symlink = ceph_symlink,
1320 .mkdir = ceph_mkdir,
1322 .unlink = ceph_unlink,
1323 .rmdir = ceph_unlink,
1324 .rename = ceph_rename,
1325 .create = ceph_create,
1326 .atomic_open = ceph_atomic_open,
1329 const struct dentry_operations ceph_dentry_ops = {
1330 .d_revalidate = ceph_d_revalidate,
1331 .d_release = ceph_d_release,
1332 .d_prune = ceph_d_prune,
1335 const struct dentry_operations ceph_snapdir_dentry_ops = {
1336 .d_revalidate = ceph_snapdir_d_revalidate,
1337 .d_release = ceph_d_release,
1340 const struct dentry_operations ceph_snap_dentry_ops = {
1341 .d_release = ceph_d_release,
1342 .d_prune = ceph_d_prune,