1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _FS_CEPH_MDS_CLIENT_H
3#define _FS_CEPH_MDS_CLIENT_H
4
5#include <linux/completion.h>
6#include <linux/kref.h>
7#include <linux/list.h>
8#include <linux/mutex.h>
9#include <linux/rbtree.h>
10#include <linux/spinlock.h>
11#include <linux/refcount.h>
12#include <linux/utsname.h>
13#include <linux/ktime.h>
14
15#include <linux/ceph/types.h>
16#include <linux/ceph/messenger.h>
17#include <linux/ceph/auth.h>
18
19#include "mdsmap.h"
20#include "metric.h"
21#include "super.h"
22
23/* The first 8 bits are reserved for old ceph releases */
24enum ceph_feature_type {
25	CEPHFS_FEATURE_MIMIC = 8,
26	CEPHFS_FEATURE_REPLY_ENCODING,
27	CEPHFS_FEATURE_RECLAIM_CLIENT,
28	CEPHFS_FEATURE_LAZY_CAP_WANTED,
29	CEPHFS_FEATURE_MULTI_RECONNECT,
30	CEPHFS_FEATURE_DELEG_INO,
31	CEPHFS_FEATURE_METRIC_COLLECT,
32	CEPHFS_FEATURE_ALTERNATE_NAME,
33	CEPHFS_FEATURE_NOTIFY_SESSION_STATE,
34	CEPHFS_FEATURE_OP_GETVXATTR,
35	CEPHFS_FEATURE_32BITS_RETRY_FWD,
36	CEPHFS_FEATURE_NEW_SNAPREALM_INFO,
37	CEPHFS_FEATURE_HAS_OWNER_UIDGID,
38
39	CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_HAS_OWNER_UIDGID,
40};
41
42#define CEPHFS_FEATURES_CLIENT_SUPPORTED {	\
43	0, 1, 2, 3, 4, 5, 6, 7,			\
44	CEPHFS_FEATURE_MIMIC,			\
45	CEPHFS_FEATURE_REPLY_ENCODING,		\
46	CEPHFS_FEATURE_LAZY_CAP_WANTED,		\
47	CEPHFS_FEATURE_MULTI_RECONNECT,		\
48	CEPHFS_FEATURE_DELEG_INO,		\
49	CEPHFS_FEATURE_METRIC_COLLECT,		\
50	CEPHFS_FEATURE_ALTERNATE_NAME,		\
51	CEPHFS_FEATURE_NOTIFY_SESSION_STATE,	\
52	CEPHFS_FEATURE_OP_GETVXATTR,		\
53	CEPHFS_FEATURE_32BITS_RETRY_FWD,	\
54	CEPHFS_FEATURE_HAS_OWNER_UIDGID,	\
55}
56
57/*
58 * Some lock dependencies:
59 *
60 * session->s_mutex
61 *         mdsc->mutex
62 *
63 *         mdsc->snap_rwsem
64 *
65 *         ci->i_ceph_lock
66 *                 mdsc->snap_flush_lock
67 *                 mdsc->cap_delay_lock
68 *
69 */
70
71struct ceph_fs_client;
72struct ceph_cap;
73
74/*
75 * parsed info about a single inode.  pointers are into the encoded
76 * on-wire structures within the mds reply message payload.
77 */
78struct ceph_mds_reply_info_in {
79	struct ceph_mds_reply_inode *in;
80	struct ceph_dir_layout dir_layout;
81	u32 symlink_len;
82	char *symlink;
83	u32 xattr_len;
84	char *xattr_data;
85	u64 inline_version;
86	u32 inline_len;
87	char *inline_data;
88	u32 pool_ns_len;
89	char *pool_ns_data;
90	u64 max_bytes;
91	u64 max_files;
92	s32 dir_pin;
93	struct ceph_timespec btime;
94	struct ceph_timespec snap_btime;
95	u8 *fscrypt_auth;
96	u8 *fscrypt_file;
97	u32 fscrypt_auth_len;
98	u32 fscrypt_file_len;
99	u64 rsnaps;
100	u64 change_attr;
101};
102
103struct ceph_mds_reply_dir_entry {
104	bool			      is_nokey;
105	char                          *name;
106	u32                           name_len;
107	u32			      raw_hash;
108	struct ceph_mds_reply_lease   *lease;
109	struct ceph_mds_reply_info_in inode;
110	loff_t			      offset;
111};
112
113struct ceph_mds_reply_xattr {
114	char *xattr_value;
115	size_t xattr_value_len;
116};
117
118/*
119 * parsed info about an mds reply, including information about
120 * either: 1) the target inode and/or its parent directory and dentry,
121 * and directory contents (for readdir results), or
122 * 2) the file range lock info (for fcntl F_GETLK results).
123 */
124struct ceph_mds_reply_info_parsed {
125	struct ceph_mds_reply_head    *head;
126
127	/* trace */
128	struct ceph_mds_reply_info_in diri, targeti;
129	struct ceph_mds_reply_dirfrag *dirfrag;
130	char                          *dname;
131	u8			      *altname;
132	u32                           dname_len;
133	u32                           altname_len;
134	struct ceph_mds_reply_lease   *dlease;
135	struct ceph_mds_reply_xattr   xattr_info;
136
137	/* extra */
138	union {
139		/* for fcntl F_GETLK results */
140		struct ceph_filelock *filelock_reply;
141
142		/* for readdir results */
143		struct {
144			struct ceph_mds_reply_dirfrag *dir_dir;
145			size_t			      dir_buf_size;
146			int                           dir_nr;
147			bool			      dir_end;
148			bool			      dir_complete;
149			bool			      hash_order;
150			bool			      offset_hash;
151			struct ceph_mds_reply_dir_entry  *dir_entries;
152		};
153
154		/* for create results */
155		struct {
156			bool has_create_ino;
157			u64 ino;
158		};
159	};
160
161	/* encoded blob describing snapshot contexts for certain
162	   operations (e.g., open) */
163	void *snapblob;
164	int snapblob_len;
165};
166
167
168/*
169 * cap releases are batched and sent to the MDS en masse.
170 *
171 * Account for per-message overhead of mds_cap_release header
172 * and __le32 for osd epoch barrier trailing field.
173 */
174#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) -		\
175				sizeof(struct ceph_mds_cap_release)) /	\
176			        sizeof(struct ceph_mds_cap_item))
177
178
179/*
180 * state associated with each MDS<->client session
181 */
182enum {
183	CEPH_MDS_SESSION_NEW = 1,
184	CEPH_MDS_SESSION_OPENING = 2,
185	CEPH_MDS_SESSION_OPEN = 3,
186	CEPH_MDS_SESSION_HUNG = 4,
187	CEPH_MDS_SESSION_RESTARTING = 5,
188	CEPH_MDS_SESSION_RECONNECTING = 6,
189	CEPH_MDS_SESSION_CLOSING = 7,
190	CEPH_MDS_SESSION_CLOSED = 8,
191	CEPH_MDS_SESSION_REJECTED = 9,
192};
193
194struct ceph_mds_session {
195	struct ceph_mds_client *s_mdsc;
196	int               s_mds;
197	int               s_state;
198	unsigned long     s_ttl;      /* time until mds kills us */
199	unsigned long	  s_features;
200	u64               s_seq;      /* incoming msg seq # */
201	struct mutex      s_mutex;    /* serialize session messages */
202
203	struct ceph_connection s_con;
204
205	struct ceph_auth_handshake s_auth;
206
207	atomic_t          s_cap_gen;  /* inc each time we get mds stale msg */
208	unsigned long     s_cap_ttl;  /* when session caps expire. protected by s_mutex */
209
210	/* protected by s_cap_lock */
211	spinlock_t        s_cap_lock;
212	refcount_t        s_ref;
213	struct list_head  s_caps;     /* all caps issued by this session */
214	struct ceph_cap  *s_cap_iterator;
215	int               s_nr_caps;
216	int               s_num_cap_releases;
217	int		  s_cap_reconnect;
218	int		  s_readonly;
219	struct list_head  s_cap_releases; /* waiting cap_release messages */
220	struct work_struct s_cap_release_work;
221
222	/* See ceph_inode_info->i_dirty_item. */
223	struct list_head  s_cap_dirty;	      /* inodes w/ dirty caps */
224
225	/* See ceph_inode_info->i_flushing_item. */
226	struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
227
228	unsigned long     s_renew_requested; /* last time we sent a renew req */
229	u64               s_renew_seq;
230
231	struct list_head  s_waiting;  /* waiting requests */
232	struct list_head  s_unsafe;   /* unsafe requests */
233	struct xarray	  s_delegated_inos;
234};
235
236/*
237 * modes of choosing which MDS to send a request to
238 */
239enum {
240	USE_ANY_MDS,
241	USE_RANDOM_MDS,
242	USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
243};
244
245struct ceph_mds_request;
246struct ceph_mds_client;
247
248/*
249 * request completion callback
250 */
251typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
252					     struct ceph_mds_request *req);
253/*
254 * wait for request completion callback
255 */
256typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
257						 struct ceph_mds_request *req);
258
259/*
260 * an in-flight mds request
261 */
262struct ceph_mds_request {
263	u64 r_tid;                   /* transaction id */
264	struct rb_node r_node;
265	struct ceph_mds_client *r_mdsc;
266
267	struct kref       r_kref;
268	int r_op;                    /* mds op code */
269
270	/* operation on what? */
271	struct inode *r_inode;              /* arg1 */
272	struct dentry *r_dentry;            /* arg1 */
273	struct dentry *r_old_dentry;        /* arg2: rename from or link from */
274	struct inode *r_old_dentry_dir;     /* arg2: old dentry's parent dir */
275	char *r_path1, *r_path2;
276	struct ceph_vino r_ino1, r_ino2;
277
278	struct inode *r_parent;		    /* parent dir inode */
279	struct inode *r_target_inode;       /* resulting inode */
280	struct inode *r_new_inode;	    /* new inode (for creates) */
281
282#define CEPH_MDS_R_DIRECT_IS_HASH	(1) /* r_direct_hash is valid */
283#define CEPH_MDS_R_ABORTED		(2) /* call was aborted */
284#define CEPH_MDS_R_GOT_UNSAFE		(3) /* got an unsafe reply */
285#define CEPH_MDS_R_GOT_SAFE		(4) /* got a safe reply */
286#define CEPH_MDS_R_GOT_RESULT		(5) /* got a result */
287#define CEPH_MDS_R_DID_PREPOPULATE	(6) /* prepopulated readdir */
288#define CEPH_MDS_R_PARENT_LOCKED	(7) /* is r_parent->i_rwsem wlocked? */
289#define CEPH_MDS_R_ASYNC		(8) /* async request */
290#define CEPH_MDS_R_FSCRYPT_FILE		(9) /* must marshal fscrypt_file field */
291	unsigned long	r_req_flags;
292
293	struct mutex r_fill_mutex;
294
295	union ceph_mds_request_args r_args;
296
297	struct ceph_fscrypt_auth *r_fscrypt_auth;
298	u64	r_fscrypt_file;
299
300	u8 *r_altname;		    /* fscrypt binary crypttext for long filenames */
301	u32 r_altname_len;	    /* length of r_altname */
302
303	int r_fmode;        /* file mode, if expecting cap */
304	int r_request_release_offset;
305	const struct cred *r_cred;
306	struct mnt_idmap *r_mnt_idmap;
307	struct timespec64 r_stamp;
308
309	/* for choosing which mds to send this request to */
310	int r_direct_mode;
311	u32 r_direct_hash;      /* choose dir frag based on this dentry hash */
312
313	/* data payload is used for xattr ops */
314	struct ceph_pagelist *r_pagelist;
315
316	/* what caps shall we drop? */
317	int r_inode_drop, r_inode_unless;
318	int r_dentry_drop, r_dentry_unless;
319	int r_old_dentry_drop, r_old_dentry_unless;
320	struct inode *r_old_inode;
321	int r_old_inode_drop, r_old_inode_unless;
322
323	struct ceph_msg  *r_request;  /* original request */
324	struct ceph_msg  *r_reply;
325	struct ceph_mds_reply_info_parsed r_reply_info;
326	int r_err;
327	u32               r_readdir_offset;
328
329	struct page *r_locked_page;
330	int r_dir_caps;
331	int r_num_caps;
332
333	unsigned long r_timeout;  /* optional.  jiffies, 0 is "wait forever" */
334	unsigned long r_started;  /* start time to measure timeout against */
335	unsigned long r_start_latency;  /* start time to measure latency */
336	unsigned long r_end_latency;    /* finish time to measure latency */
337	unsigned long r_request_started; /* start time for mds request only,
338					    used to measure lease durations */
339
340	/* link unsafe requests to parent directory, for fsync */
341	struct inode	*r_unsafe_dir;
342	struct list_head r_unsafe_dir_item;
343
344	/* unsafe requests that modify the target inode */
345	struct list_head r_unsafe_target_item;
346
347	struct ceph_mds_session *r_session;
348
349	int               r_attempts;   /* resend attempts */
350	int               r_num_fwd;    /* number of forward attempts */
351	int               r_resend_mds; /* mds to resend to next, if any*/
352	u32               r_sent_on_mseq; /* cap mseq request was sent at*/
353	u64		  r_deleg_ino;
354
355	struct list_head  r_wait;
356	struct completion r_completion;
357	struct completion r_safe_completion;
358	ceph_mds_request_callback_t r_callback;
359	struct list_head  r_unsafe_item;  /* per-session unsafe list item */
360
361	long long	  r_dir_release_cnt;
362	long long	  r_dir_ordered_cnt;
363	int		  r_readdir_cache_idx;
364
365	int		  r_feature_needed;
366
367	struct ceph_cap_reservation r_caps_reservation;
368};
369
370struct ceph_pool_perm {
371	struct rb_node node;
372	int perm;
373	s64 pool;
374	size_t pool_ns_len;
375	char pool_ns[];
376};
377
378struct ceph_snapid_map {
379	struct rb_node node;
380	struct list_head lru;
381	atomic_t ref;
382	dev_t dev;
383	u64 snap;
384	unsigned long last_used;
385};
386
387/*
388 * node for list of quotarealm inodes that are not visible from the filesystem
389 * mountpoint, but required to handle, e.g. quotas.
390 */
391struct ceph_quotarealm_inode {
392	struct rb_node node;
393	u64 ino;
394	unsigned long timeout; /* last time a lookup failed for this inode */
395	struct mutex mutex;
396	struct inode *inode;
397};
398
399struct cap_wait {
400	struct list_head	list;
401	u64			ino;
402	pid_t			tgid;
403	int			need;
404	int			want;
405};
406
407enum {
408	CEPH_MDSC_STOPPING_BEGIN = 1,
409	CEPH_MDSC_STOPPING_FLUSHING = 2,
410	CEPH_MDSC_STOPPING_FLUSHED = 3,
411};
412
413/*
414 * mds client state
415 */
416struct ceph_mds_client {
417	struct ceph_fs_client  *fsc;
418	struct mutex            mutex;         /* all nested structures */
419
420	struct ceph_mdsmap      *mdsmap;
421	struct completion       safe_umount_waiters;
422	wait_queue_head_t       session_close_wq;
423	struct list_head        waiting_for_map;
424	int 			mdsmap_err;
425
426	struct ceph_mds_session **sessions;    /* NULL for mds if no session */
427	atomic_t		num_sessions;
428	int                     max_sessions;  /* len of sessions array */
429
430	spinlock_t              stopping_lock;  /* protect snap_empty */
431	int                     stopping;      /* the stage of shutting down */
432	atomic_t                stopping_blockers;
433	struct completion	stopping_waiter;
434
435	atomic64_t		quotarealms_count; /* # realms with quota */
436	/*
437	 * We keep a list of inodes we don't see in the mountpoint but that we
438	 * need to track quota realms.
439	 */
440	struct rb_root		quotarealms_inodes;
441	struct mutex		quotarealms_inodes_mutex;
442
443	/*
444	 * snap_rwsem will cover cap linkage into snaprealms, and
445	 * realm snap contexts.  (later, we can do per-realm snap
446	 * contexts locks..)  the empty list contains realms with no
447	 * references (implying they contain no inodes with caps) that
448	 * should be destroyed.
449	 */
450	u64			last_snap_seq;
451	struct rw_semaphore     snap_rwsem;
452	struct rb_root          snap_realms;
453	struct list_head        snap_empty;
454	int			num_snap_realms;
455	spinlock_t              snap_empty_lock;  /* protect snap_empty */
456
457	u64                    last_tid;      /* most recent mds request */
458	u64                    oldest_tid;    /* oldest incomplete mds request,
459						 excluding setfilelock requests */
460	struct rb_root         request_tree;  /* pending mds requests */
461	struct delayed_work    delayed_work;  /* delayed work */
462	unsigned long    last_renew_caps;  /* last time we renewed our caps */
463	struct list_head cap_delay_list;   /* caps with delayed release */
464	struct list_head cap_unlink_delay_list;  /* caps with delayed release for unlink */
465	spinlock_t       cap_delay_lock;   /* protects cap_delay_list and cap_unlink_delay_list */
466	struct list_head snap_flush_list;  /* cap_snaps ready to flush */
467	spinlock_t       snap_flush_lock;
468
469	u64               last_cap_flush_tid;
470	struct list_head  cap_flush_list;
471	struct list_head  cap_dirty_migrating; /* ...that are migration... */
472	int               num_cap_flushing; /* # caps we are flushing */
473	spinlock_t        cap_dirty_lock;   /* protects above items */
474	wait_queue_head_t cap_flushing_wq;
475
476	struct work_struct cap_reclaim_work;
477	atomic_t	   cap_reclaim_pending;
478
479	struct work_struct cap_unlink_work;
480
481	/*
482	 * Cap reservations
483	 *
484	 * Maintain a global pool of preallocated struct ceph_caps, referenced
485	 * by struct ceph_caps_reservations.  This ensures that we preallocate
486	 * memory needed to successfully process an MDS response.  (If an MDS
487	 * sends us cap information and we fail to process it, we will have
488	 * problems due to the client and MDS being out of sync.)
489	 *
490	 * Reservations are 'owned' by a ceph_cap_reservation context.
491	 */
492	spinlock_t	caps_list_lock;
493	struct		list_head caps_list; /* unused (reserved or
494						unreserved) */
495	struct		list_head cap_wait_list;
496	int		caps_total_count;    /* total caps allocated */
497	int		caps_use_count;      /* in use */
498	int		caps_use_max;	     /* max used caps */
499	int		caps_reserve_count;  /* unused, reserved */
500	int		caps_avail_count;    /* unused, unreserved */
501	int		caps_min_count;      /* keep at least this many
502						(unreserved) */
503	spinlock_t	  dentry_list_lock;
504	struct list_head  dentry_leases;     /* fifo list */
505	struct list_head  dentry_dir_leases; /* lru list */
506
507	struct ceph_client_metric metric;
508
509	spinlock_t		snapid_map_lock;
510	struct rb_root		snapid_map_tree;
511	struct list_head	snapid_map_lru;
512
513	struct rw_semaphore     pool_perm_rwsem;
514	struct rb_root		pool_perm_tree;
515
516	char nodename[__NEW_UTS_LEN + 1];
517};
518
519extern const char *ceph_mds_op_name(int op);
520
521extern bool check_session_state(struct ceph_mds_session *s);
522void inc_session_sequence(struct ceph_mds_session *s);
523
524extern struct ceph_mds_session *
525__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
526
527extern const char *ceph_session_state_name(int s);
528
529extern struct ceph_mds_session *
530ceph_get_mds_session(struct ceph_mds_session *s);
531extern void ceph_put_mds_session(struct ceph_mds_session *s);
532
533extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
534			     struct ceph_msg *msg, int mds);
535
536extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
537extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
538extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
539extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
540
541extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
542
543extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
544extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
545					   struct inode *dir);
546extern struct ceph_mds_request *
547ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
548extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
549				    struct inode *dir,
550				    struct ceph_mds_request *req);
551int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
552			struct ceph_mds_request *req,
553			ceph_mds_request_wait_callback_t wait_func);
554extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
555				struct inode *dir,
556				struct ceph_mds_request *req);
557extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
558extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
559static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
560{
561	kref_get(&req->r_kref);
562}
563extern void ceph_mdsc_release_request(struct kref *kref);
564static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
565{
566	kref_put(&req->r_kref, ceph_mdsc_release_request);
567}
568
569extern void send_flush_mdlog(struct ceph_mds_session *s);
570extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
571				       void (*cb)(struct ceph_mds_session *),
572				       bool check_state);
573extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
574extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
575				    struct ceph_cap *cap);
576extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
577				    struct ceph_mds_session *session);
578extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
579extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
580extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
581extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
582				     int (*cb)(struct inode *, int mds, void *),
583				     void *arg);
584extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
585
586static inline void ceph_mdsc_free_path(char *path, int len)
587{
588	if (!IS_ERR_OR_NULL(path))
589		__putname(path - (PATH_MAX - 1 - len));
590}
591
592extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
593				  struct dentry *dentry, int *plen, u64 *base,
594				  int for_wire);
595
596extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
597extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
598				     struct dentry *dentry, char action,
599				     u32 seq);
600
601extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
602				    struct ceph_msg *msg);
603extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
604				   struct ceph_msg *msg);
605
606extern struct ceph_mds_session *
607ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
608extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
609					  struct ceph_mds_session *session);
610
611extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
612			  struct ceph_mds_session *session,
613			  int max_caps);
614
615static inline int ceph_wait_on_async_create(struct inode *inode)
616{
617	struct ceph_inode_info *ci = ceph_inode(inode);
618
619	return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
620			   TASK_KILLABLE);
621}
622
623extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
624extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
625extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
626
627extern bool enable_unsafe_idmap;
628#endif
629