mds_client.h

  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	CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,
 39
 40	CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,
 41};
 42
 43#define CEPHFS_FEATURES_CLIENT_SUPPORTED {	\
 44	0, 1, 2, 3, 4, 5, 6, 7,			\
 45	CEPHFS_FEATURE_MIMIC,			\
 46	CEPHFS_FEATURE_REPLY_ENCODING,		\
 47	CEPHFS_FEATURE_LAZY_CAP_WANTED,		\
 48	CEPHFS_FEATURE_MULTI_RECONNECT,		\
 49	CEPHFS_FEATURE_DELEG_INO,		\
 50	CEPHFS_FEATURE_METRIC_COLLECT,		\
 51	CEPHFS_FEATURE_ALTERNATE_NAME,		\
 52	CEPHFS_FEATURE_NOTIFY_SESSION_STATE,	\
 53	CEPHFS_FEATURE_OP_GETVXATTR,		\
 54	CEPHFS_FEATURE_32BITS_RETRY_FWD,	\
 55	CEPHFS_FEATURE_HAS_OWNER_UIDGID,	\
 56	CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,	\
 57}
 58
 59/*
 60 * Some lock dependencies:
 61 *
 62 * session->s_mutex
 63 *         mdsc->mutex
 64 *
 65 *         mdsc->snap_rwsem
 66 *
 67 *         ci->i_ceph_lock
 68 *                 mdsc->snap_flush_lock
 69 *                 mdsc->cap_delay_lock
 70 *
 71 */
 72
 73struct ceph_fs_client;
 74struct ceph_cap;
 75
 76#define MDS_AUTH_UID_ANY -1
 77
 78struct ceph_mds_cap_match {
 79	s64 uid;  /* default to MDS_AUTH_UID_ANY */
 80	u32 num_gids;
 81	u32 *gids;  /* use these GIDs */
 82	char *path;  /* require path to be child of this
 83			(may be "" or "/" for any) */
 84	char *fs_name;
 85	bool root_squash;  /* default to false */
 86};
 87
 88struct ceph_mds_cap_auth {
 89	struct ceph_mds_cap_match match;
 90	bool readable;
 91	bool writeable;
 92};
 93
 94/*
 95 * parsed info about a single inode.  pointers are into the encoded
 96 * on-wire structures within the mds reply message payload.
 97 */
 98struct ceph_mds_reply_info_in {
 99	struct ceph_mds_reply_inode *in;
100	struct ceph_dir_layout dir_layout;
101	u32 symlink_len;
102	char *symlink;
103	u32 xattr_len;
104	char *xattr_data;
105	u64 inline_version;
106	u32 inline_len;
107	char *inline_data;
108	u32 pool_ns_len;
109	char *pool_ns_data;
110	u64 max_bytes;
111	u64 max_files;
112	s32 dir_pin;
113	struct ceph_timespec btime;
114	struct ceph_timespec snap_btime;
115	u8 *fscrypt_auth;
116	u8 *fscrypt_file;
117	u32 fscrypt_auth_len;
118	u32 fscrypt_file_len;
119	u64 rsnaps;
120	u64 change_attr;
121};
122
123struct ceph_mds_reply_dir_entry {
124	bool			      is_nokey;
125	char                          *name;
126	u32                           name_len;
127	u32			      raw_hash;
128	struct ceph_mds_reply_lease   *lease;
129	struct ceph_mds_reply_info_in inode;
130	loff_t			      offset;
131};
132
133struct ceph_mds_reply_xattr {
134	char *xattr_value;
135	size_t xattr_value_len;
136};
137
138/*
139 * parsed info about an mds reply, including information about
140 * either: 1) the target inode and/or its parent directory and dentry,
141 * and directory contents (for readdir results), or
142 * 2) the file range lock info (for fcntl F_GETLK results).
143 */
144struct ceph_mds_reply_info_parsed {
145	struct ceph_mds_reply_head    *head;
146
147	/* trace */
148	struct ceph_mds_reply_info_in diri, targeti;
149	struct ceph_mds_reply_dirfrag *dirfrag;
150	char                          *dname;
151	u8			      *altname;
152	u32                           dname_len;
153	u32                           altname_len;
154	struct ceph_mds_reply_lease   *dlease;
155	struct ceph_mds_reply_xattr   xattr_info;
156
157	/* extra */
158	union {
159		/* for fcntl F_GETLK results */
160		struct ceph_filelock *filelock_reply;
161
162		/* for readdir results */
163		struct {
164			struct ceph_mds_reply_dirfrag *dir_dir;
165			size_t			      dir_buf_size;
166			int                           dir_nr;
167			bool			      dir_end;
168			bool			      dir_complete;
169			bool			      hash_order;
170			bool			      offset_hash;
171			struct ceph_mds_reply_dir_entry  *dir_entries;
172		};
173
174		/* for create results */
175		struct {
176			bool has_create_ino;
177			u64 ino;
178		};
179	};
180
181	/* encoded blob describing snapshot contexts for certain
182	   operations (e.g., open) */
183	void *snapblob;
184	int snapblob_len;
185};
186
187
188/*
189 * cap releases are batched and sent to the MDS en masse.
190 *
191 * Account for per-message overhead of mds_cap_release header
192 * and __le32 for osd epoch barrier trailing field.
193 */
194#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) -		\
195				sizeof(struct ceph_mds_cap_release)) /	\
196			        sizeof(struct ceph_mds_cap_item))
197
198
199/*
200 * state associated with each MDS<->client session
201 */
202enum {
203	CEPH_MDS_SESSION_NEW = 1,
204	CEPH_MDS_SESSION_OPENING = 2,
205	CEPH_MDS_SESSION_OPEN = 3,
206	CEPH_MDS_SESSION_HUNG = 4,
207	CEPH_MDS_SESSION_RESTARTING = 5,
208	CEPH_MDS_SESSION_RECONNECTING = 6,
209	CEPH_MDS_SESSION_CLOSING = 7,
210	CEPH_MDS_SESSION_CLOSED = 8,
211	CEPH_MDS_SESSION_REJECTED = 9,
212};
213
214struct ceph_mds_session {
215	struct ceph_mds_client *s_mdsc;
216	int               s_mds;
217	int               s_state;
218	unsigned long     s_ttl;      /* time until mds kills us */
219	unsigned long	  s_features;
220	u64               s_seq;      /* incoming msg seq # */
221	struct mutex      s_mutex;    /* serialize session messages */
222
223	struct ceph_connection s_con;
224
225	struct ceph_auth_handshake s_auth;
226
227	atomic_t          s_cap_gen;  /* inc each time we get mds stale msg */
228	unsigned long     s_cap_ttl;  /* when session caps expire. protected by s_mutex */
229
230	/* protected by s_cap_lock */
231	spinlock_t        s_cap_lock;
232	refcount_t        s_ref;
233	struct list_head  s_caps;     /* all caps issued by this session */
234	struct ceph_cap  *s_cap_iterator;
235	int               s_nr_caps;
236	int               s_num_cap_releases;
237	int		  s_cap_reconnect;
238	int		  s_readonly;
239	struct list_head  s_cap_releases; /* waiting cap_release messages */
240	struct work_struct s_cap_release_work;
241
242	/* See ceph_inode_info->i_dirty_item. */
243	struct list_head  s_cap_dirty;	      /* inodes w/ dirty caps */
244
245	/* See ceph_inode_info->i_flushing_item. */
246	struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
247
248	unsigned long     s_renew_requested; /* last time we sent a renew req */
249	u64               s_renew_seq;
250
251	struct list_head  s_waiting;  /* waiting requests */
252	struct list_head  s_unsafe;   /* unsafe requests */
253	struct xarray	  s_delegated_inos;
254};
255
256/*
257 * modes of choosing which MDS to send a request to
258 */
259enum {
260	USE_ANY_MDS,
261	USE_RANDOM_MDS,
262	USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
263};
264
265struct ceph_mds_request;
266struct ceph_mds_client;
267
268/*
269 * request completion callback
270 */
271typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
272					     struct ceph_mds_request *req);
273/*
274 * wait for request completion callback
275 */
276typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
277						 struct ceph_mds_request *req);
278
279/*
280 * an in-flight mds request
281 */
282struct ceph_mds_request {
283	u64 r_tid;                   /* transaction id */
284	struct rb_node r_node;
285	struct ceph_mds_client *r_mdsc;
286
287	struct kref       r_kref;
288	int r_op;                    /* mds op code */
289
290	/* operation on what? */
291	struct inode *r_inode;              /* arg1 */
292	struct dentry *r_dentry;            /* arg1 */
293	struct dentry *r_old_dentry;        /* arg2: rename from or link from */
294	struct inode *r_old_dentry_dir;     /* arg2: old dentry's parent dir */
295	char *r_path1, *r_path2;
296	struct ceph_vino r_ino1, r_ino2;
297
298	struct inode *r_parent;		    /* parent dir inode */
299	struct inode *r_target_inode;       /* resulting inode */
300	struct inode *r_new_inode;	    /* new inode (for creates) */
301
302	const struct qstr *r_dname;	    /* stable name (for ->d_revalidate) */
303
304#define CEPH_MDS_R_DIRECT_IS_HASH	(1) /* r_direct_hash is valid */
305#define CEPH_MDS_R_ABORTED		(2) /* call was aborted */
306#define CEPH_MDS_R_GOT_UNSAFE		(3) /* got an unsafe reply */
307#define CEPH_MDS_R_GOT_SAFE		(4) /* got a safe reply */
308#define CEPH_MDS_R_GOT_RESULT		(5) /* got a result */
309#define CEPH_MDS_R_DID_PREPOPULATE	(6) /* prepopulated readdir */
310#define CEPH_MDS_R_PARENT_LOCKED	(7) /* is r_parent->i_rwsem wlocked? */
311#define CEPH_MDS_R_ASYNC		(8) /* async request */
312#define CEPH_MDS_R_FSCRYPT_FILE		(9) /* must marshal fscrypt_file field */
313	unsigned long	r_req_flags;
314
315	struct mutex r_fill_mutex;
316
317	union ceph_mds_request_args r_args;
318
319	struct ceph_fscrypt_auth *r_fscrypt_auth;
320	u64	r_fscrypt_file;
321
322	u8 *r_altname;		    /* fscrypt binary crypttext for long filenames */
323	u32 r_altname_len;	    /* length of r_altname */
324
325	int r_fmode;        /* file mode, if expecting cap */
326	int r_request_release_offset;
327	const struct cred *r_cred;
328	struct mnt_idmap *r_mnt_idmap;
329	struct timespec64 r_stamp;
330
331	/* for choosing which mds to send this request to */
332	int r_direct_mode;
333	u32 r_direct_hash;      /* choose dir frag based on this dentry hash */
334
335	/* data payload is used for xattr ops */
336	struct ceph_pagelist *r_pagelist;
337
338	/* what caps shall we drop? */
339	int r_inode_drop, r_inode_unless;
340	int r_dentry_drop, r_dentry_unless;
341	int r_old_dentry_drop, r_old_dentry_unless;
342	struct inode *r_old_inode;
343	int r_old_inode_drop, r_old_inode_unless;
344
345	struct ceph_msg  *r_request;  /* original request */
346	struct ceph_msg  *r_reply;
347	struct ceph_mds_reply_info_parsed r_reply_info;
348	int r_err;
349	u32               r_readdir_offset;
350
351	struct page *r_locked_page;
352	int r_dir_caps;
353	int r_num_caps;
354
355	unsigned long r_timeout;  /* optional.  jiffies, 0 is "wait forever" */
356	unsigned long r_started;  /* start time to measure timeout against */
357	unsigned long r_start_latency;  /* start time to measure latency */
358	unsigned long r_end_latency;    /* finish time to measure latency */
359	unsigned long r_request_started; /* start time for mds request only,
360					    used to measure lease durations */
361
362	/* link unsafe requests to parent directory, for fsync */
363	struct inode	*r_unsafe_dir;
364	struct list_head r_unsafe_dir_item;
365
366	/* unsafe requests that modify the target inode */
367	struct list_head r_unsafe_target_item;
368
369	struct ceph_mds_session *r_session;
370
371	int               r_attempts;   /* resend attempts */
372	int               r_num_fwd;    /* number of forward attempts */
373	int               r_resend_mds; /* mds to resend to next, if any*/
374	u32               r_sent_on_mseq; /* cap mseq request was sent at*/
375	u64		  r_deleg_ino;
376
377	struct list_head  r_wait;
378	struct completion r_completion;
379	struct completion r_safe_completion;
380	ceph_mds_request_callback_t r_callback;
381	struct list_head  r_unsafe_item;  /* per-session unsafe list item */
382
383	long long	  r_dir_release_cnt;
384	long long	  r_dir_ordered_cnt;
385	int		  r_readdir_cache_idx;
386
387	int		  r_feature_needed;
388
389	struct ceph_cap_reservation r_caps_reservation;
390};
391
392struct ceph_pool_perm {
393	struct rb_node node;
394	int perm;
395	s64 pool;
396	size_t pool_ns_len;
397	char pool_ns[];
398};
399
400struct ceph_snapid_map {
401	struct rb_node node;
402	struct list_head lru;
403	atomic_t ref;
404	dev_t dev;
405	u64 snap;
406	unsigned long last_used;
407};
408
409/*
410 * node for list of quotarealm inodes that are not visible from the filesystem
411 * mountpoint, but required to handle, e.g. quotas.
412 */
413struct ceph_quotarealm_inode {
414	struct rb_node node;
415	u64 ino;
416	unsigned long timeout; /* last time a lookup failed for this inode */
417	struct mutex mutex;
418	struct inode *inode;
419};
420
421#ifdef CONFIG_DEBUG_FS
422
423struct cap_wait {
424	struct list_head	list;
425	u64			ino;
426	pid_t			tgid;
427	int			need;
428	int			want;
429};
430
431#endif
432
433enum {
434	CEPH_MDSC_STOPPING_BEGIN = 1,
435	CEPH_MDSC_STOPPING_FLUSHING = 2,
436	CEPH_MDSC_STOPPING_FLUSHED = 3,
437};
438
439/*
440 * mds client state
441 */
442struct ceph_mds_client {
443	struct ceph_fs_client  *fsc;
444	struct mutex            mutex;         /* all nested structures */
445
446	struct ceph_mdsmap      *mdsmap;
447	struct completion       safe_umount_waiters;
448	wait_queue_head_t       session_close_wq;
449	struct list_head        waiting_for_map;
450	int 			mdsmap_err;
451
452	struct ceph_mds_session **sessions;    /* NULL for mds if no session */
453	atomic_t		num_sessions;
454	int                     max_sessions;  /* len of sessions array */
455
456	spinlock_t              stopping_lock;  /* protect snap_empty */
457	int                     stopping;      /* the stage of shutting down */
458	atomic_t                stopping_blockers;
459	struct completion	stopping_waiter;
460
461	atomic64_t		dirty_folios;
462	wait_queue_head_t	flush_end_wq;
463
464	atomic64_t		quotarealms_count; /* # realms with quota */
465	/*
466	 * We keep a list of inodes we don't see in the mountpoint but that we
467	 * need to track quota realms.
468	 */
469	struct rb_root		quotarealms_inodes;
470	struct mutex		quotarealms_inodes_mutex;
471
472	/*
473	 * snap_rwsem will cover cap linkage into snaprealms, and
474	 * realm snap contexts.  (later, we can do per-realm snap
475	 * contexts locks..)  the empty list contains realms with no
476	 * references (implying they contain no inodes with caps) that
477	 * should be destroyed.
478	 */
479	u64			last_snap_seq;
480	struct rw_semaphore     snap_rwsem;
481	struct rb_root          snap_realms;
482	struct list_head        snap_empty;
483	int			num_snap_realms;
484	spinlock_t              snap_empty_lock;  /* protect snap_empty */
485
486	u64                    last_tid;      /* most recent mds request */
487	u64                    oldest_tid;    /* oldest incomplete mds request,
488						 excluding setfilelock requests */
489	struct rb_root         request_tree;  /* pending mds requests */
490	struct delayed_work    delayed_work;  /* delayed work */
491	unsigned long    last_renew_caps;  /* last time we renewed our caps */
492	struct list_head cap_delay_list;   /* caps with delayed release */
493	struct list_head cap_unlink_delay_list;  /* caps with delayed release for unlink */
494	spinlock_t       cap_delay_lock;   /* protects cap_delay_list and cap_unlink_delay_list */
495	struct list_head snap_flush_list;  /* cap_snaps ready to flush */
496	spinlock_t       snap_flush_lock;
497
498	u64               last_cap_flush_tid;
499	struct list_head  cap_flush_list;
500	struct list_head  cap_dirty_migrating; /* ...that are migration... */
501	int               num_cap_flushing; /* # caps we are flushing */
502	spinlock_t        cap_dirty_lock;   /* protects above items */
503	wait_queue_head_t cap_flushing_wq;
504
505	struct work_struct cap_reclaim_work;
506	atomic_t	   cap_reclaim_pending;
507
508	struct work_struct cap_unlink_work;
509
510	/*
511	 * Cap reservations
512	 *
513	 * Maintain a global pool of preallocated struct ceph_caps, referenced
514	 * by struct ceph_caps_reservations.  This ensures that we preallocate
515	 * memory needed to successfully process an MDS response.  (If an MDS
516	 * sends us cap information and we fail to process it, we will have
517	 * problems due to the client and MDS being out of sync.)
518	 *
519	 * Reservations are 'owned' by a ceph_cap_reservation context.
520	 */
521	spinlock_t	caps_list_lock;
522	struct		list_head caps_list; /* unused (reserved or
523						unreserved) */
524#ifdef CONFIG_DEBUG_FS
525	struct		list_head cap_wait_list;
526#endif
527	int		caps_total_count;    /* total caps allocated */
528	int		caps_use_count;      /* in use */
529	int		caps_use_max;	     /* max used caps */
530	int		caps_reserve_count;  /* unused, reserved */
531	int		caps_avail_count;    /* unused, unreserved */
532	int		caps_min_count;      /* keep at least this many
533						(unreserved) */
534	spinlock_t	  dentry_list_lock;
535	struct list_head  dentry_leases;     /* fifo list */
536	struct list_head  dentry_dir_leases; /* lru list */
537
538	struct ceph_client_metric metric;
539
540	spinlock_t		snapid_map_lock;
541	struct rb_root		snapid_map_tree;
542	struct list_head	snapid_map_lru;
543
544	struct rw_semaphore     pool_perm_rwsem;
545	struct rb_root		pool_perm_tree;
546
547	u32			 s_cap_auths_num;
548	struct ceph_mds_cap_auth *s_cap_auths;
549
550	char nodename[__NEW_UTS_LEN + 1];
551};
552
553extern const char *ceph_mds_op_name(int op);
554
555extern bool check_session_state(struct ceph_mds_session *s);
556void inc_session_sequence(struct ceph_mds_session *s);
557
558extern struct ceph_mds_session *
559__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
560
561extern const char *ceph_session_state_name(int s);
562
563extern struct ceph_mds_session *
564ceph_get_mds_session(struct ceph_mds_session *s);
565extern void ceph_put_mds_session(struct ceph_mds_session *s);
566
567extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
568extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
569extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
570extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
571
572extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
573
574extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
575extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
576					   struct inode *dir);
577extern struct ceph_mds_request *
578ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
579extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
580				    struct inode *dir,
581				    struct ceph_mds_request *req);
582int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
583			struct ceph_mds_request *req,
584			ceph_mds_request_wait_callback_t wait_func);
585extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
586				struct inode *dir,
587				struct ceph_mds_request *req);
588extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
589extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
590static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
591{
592	kref_get(&req->r_kref);
593}
594extern void ceph_mdsc_release_request(struct kref *kref);
595static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
596{
597	kref_put(&req->r_kref, ceph_mdsc_release_request);
598}
599
600extern void send_flush_mdlog(struct ceph_mds_session *s);
601extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
602				       void (*cb)(struct ceph_mds_session *),
603				       bool check_state);
604extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
605extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
606				    struct ceph_cap *cap);
607extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
608					    struct ceph_mds_session *session);
609extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
610extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
611extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
612extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
613				     int (*cb)(struct inode *, int mds, void *),
614				     void *arg);
615extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,
616				 int mask);
617
618extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
619
620/*
621 * Structure to group path-related output parameters for build_*_path functions
622 */
623struct ceph_path_info {
624	const char *path;
625	int pathlen;
626	struct ceph_vino vino;
627	bool freepath;
628};
629
630static inline void ceph_mdsc_free_path_info(const struct ceph_path_info *path_info)
631{
632	if (path_info && path_info->freepath && !IS_ERR_OR_NULL(path_info->path))
633		__putname((char *)path_info->path - (PATH_MAX - 1 - path_info->pathlen));
634}
635
636extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
637				  struct dentry *dentry, struct ceph_path_info *path_info,
638				  int for_wire);
639
640extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
641extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
642				     struct dentry *dentry, char action,
643				     u32 seq);
644
645extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
646				    struct ceph_msg *msg);
647extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
648				   struct ceph_msg *msg);
649
650extern struct ceph_mds_session *
651ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
652
653extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
654			  struct ceph_mds_session *session,
655			  int max_caps);
656
657static inline int ceph_wait_on_async_create(struct inode *inode)
658{
659	struct ceph_inode_info *ci = ceph_inode(inode);
660
661	return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
662			   TASK_KILLABLE);
663}
664
665extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
666extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
667extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
668
669extern bool enable_unsafe_idmap;
670#endif