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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#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
303#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
304#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
305#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
306#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
307#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
308#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
309#define CEPH_MDS_R_ASYNC (8) /* async request */
310#define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */
311 unsigned long r_req_flags;
312
313 struct mutex r_fill_mutex;
314
315 union ceph_mds_request_args r_args;
316
317 struct ceph_fscrypt_auth *r_fscrypt_auth;
318 u64 r_fscrypt_file;
319
320 u8 *r_altname; /* fscrypt binary crypttext for long filenames */
321 u32 r_altname_len; /* length of r_altname */
322
323 int r_fmode; /* file mode, if expecting cap */
324 int r_request_release_offset;
325 const struct cred *r_cred;
326 struct mnt_idmap *r_mnt_idmap;
327 struct timespec64 r_stamp;
328
329 /* for choosing which mds to send this request to */
330 int r_direct_mode;
331 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
332
333 /* data payload is used for xattr ops */
334 struct ceph_pagelist *r_pagelist;
335
336 /* what caps shall we drop? */
337 int r_inode_drop, r_inode_unless;
338 int r_dentry_drop, r_dentry_unless;
339 int r_old_dentry_drop, r_old_dentry_unless;
340 struct inode *r_old_inode;
341 int r_old_inode_drop, r_old_inode_unless;
342
343 struct ceph_msg *r_request; /* original request */
344 struct ceph_msg *r_reply;
345 struct ceph_mds_reply_info_parsed r_reply_info;
346 int r_err;
347 u32 r_readdir_offset;
348
349 struct page *r_locked_page;
350 int r_dir_caps;
351 int r_num_caps;
352
353 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
354 unsigned long r_started; /* start time to measure timeout against */
355 unsigned long r_start_latency; /* start time to measure latency */
356 unsigned long r_end_latency; /* finish time to measure latency */
357 unsigned long r_request_started; /* start time for mds request only,
358 used to measure lease durations */
359
360 /* link unsafe requests to parent directory, for fsync */
361 struct inode *r_unsafe_dir;
362 struct list_head r_unsafe_dir_item;
363
364 /* unsafe requests that modify the target inode */
365 struct list_head r_unsafe_target_item;
366
367 struct ceph_mds_session *r_session;
368
369 int r_attempts; /* resend attempts */
370 int r_num_fwd; /* number of forward attempts */
371 int r_resend_mds; /* mds to resend to next, if any*/
372 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
373 u64 r_deleg_ino;
374
375 struct list_head r_wait;
376 struct completion r_completion;
377 struct completion r_safe_completion;
378 ceph_mds_request_callback_t r_callback;
379 struct list_head r_unsafe_item; /* per-session unsafe list item */
380
381 long long r_dir_release_cnt;
382 long long r_dir_ordered_cnt;
383 int r_readdir_cache_idx;
384
385 int r_feature_needed;
386
387 struct ceph_cap_reservation r_caps_reservation;
388};
389
390struct ceph_pool_perm {
391 struct rb_node node;
392 int perm;
393 s64 pool;
394 size_t pool_ns_len;
395 char pool_ns[];
396};
397
398struct ceph_snapid_map {
399 struct rb_node node;
400 struct list_head lru;
401 atomic_t ref;
402 dev_t dev;
403 u64 snap;
404 unsigned long last_used;
405};
406
407/*
408 * node for list of quotarealm inodes that are not visible from the filesystem
409 * mountpoint, but required to handle, e.g. quotas.
410 */
411struct ceph_quotarealm_inode {
412 struct rb_node node;
413 u64 ino;
414 unsigned long timeout; /* last time a lookup failed for this inode */
415 struct mutex mutex;
416 struct inode *inode;
417};
418
419#ifdef CONFIG_DEBUG_FS
420
421struct cap_wait {
422 struct list_head list;
423 u64 ino;
424 pid_t tgid;
425 int need;
426 int want;
427};
428
429#endif
430
431enum {
432 CEPH_MDSC_STOPPING_BEGIN = 1,
433 CEPH_MDSC_STOPPING_FLUSHING = 2,
434 CEPH_MDSC_STOPPING_FLUSHED = 3,
435};
436
437/*
438 * mds client state
439 */
440struct ceph_mds_client {
441 struct ceph_fs_client *fsc;
442 struct mutex mutex; /* all nested structures */
443
444 struct ceph_mdsmap *mdsmap;
445 struct completion safe_umount_waiters;
446 wait_queue_head_t session_close_wq;
447 struct list_head waiting_for_map;
448 int mdsmap_err;
449
450 struct ceph_mds_session **sessions; /* NULL for mds if no session */
451 atomic_t num_sessions;
452 int max_sessions; /* len of sessions array */
453
454 spinlock_t stopping_lock; /* protect snap_empty */
455 int stopping; /* the stage of shutting down */
456 atomic_t stopping_blockers;
457 struct completion stopping_waiter;
458
459 atomic64_t quotarealms_count; /* # realms with quota */
460 /*
461 * We keep a list of inodes we don't see in the mountpoint but that we
462 * need to track quota realms.
463 */
464 struct rb_root quotarealms_inodes;
465 struct mutex quotarealms_inodes_mutex;
466
467 /*
468 * snap_rwsem will cover cap linkage into snaprealms, and
469 * realm snap contexts. (later, we can do per-realm snap
470 * contexts locks..) the empty list contains realms with no
471 * references (implying they contain no inodes with caps) that
472 * should be destroyed.
473 */
474 u64 last_snap_seq;
475 struct rw_semaphore snap_rwsem;
476 struct rb_root snap_realms;
477 struct list_head snap_empty;
478 int num_snap_realms;
479 spinlock_t snap_empty_lock; /* protect snap_empty */
480
481 u64 last_tid; /* most recent mds request */
482 u64 oldest_tid; /* oldest incomplete mds request,
483 excluding setfilelock requests */
484 struct rb_root request_tree; /* pending mds requests */
485 struct delayed_work delayed_work; /* delayed work */
486 unsigned long last_renew_caps; /* last time we renewed our caps */
487 struct list_head cap_delay_list; /* caps with delayed release */
488 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */
489 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */
490 struct list_head snap_flush_list; /* cap_snaps ready to flush */
491 spinlock_t snap_flush_lock;
492
493 u64 last_cap_flush_tid;
494 struct list_head cap_flush_list;
495 struct list_head cap_dirty_migrating; /* ...that are migration... */
496 int num_cap_flushing; /* # caps we are flushing */
497 spinlock_t cap_dirty_lock; /* protects above items */
498 wait_queue_head_t cap_flushing_wq;
499
500 struct work_struct cap_reclaim_work;
501 atomic_t cap_reclaim_pending;
502
503 struct work_struct cap_unlink_work;
504
505 /*
506 * Cap reservations
507 *
508 * Maintain a global pool of preallocated struct ceph_caps, referenced
509 * by struct ceph_caps_reservations. This ensures that we preallocate
510 * memory needed to successfully process an MDS response. (If an MDS
511 * sends us cap information and we fail to process it, we will have
512 * problems due to the client and MDS being out of sync.)
513 *
514 * Reservations are 'owned' by a ceph_cap_reservation context.
515 */
516 spinlock_t caps_list_lock;
517 struct list_head caps_list; /* unused (reserved or
518 unreserved) */
519#ifdef CONFIG_DEBUG_FS
520 struct list_head cap_wait_list;
521#endif
522 int caps_total_count; /* total caps allocated */
523 int caps_use_count; /* in use */
524 int caps_use_max; /* max used caps */
525 int caps_reserve_count; /* unused, reserved */
526 int caps_avail_count; /* unused, unreserved */
527 int caps_min_count; /* keep at least this many
528 (unreserved) */
529 spinlock_t dentry_list_lock;
530 struct list_head dentry_leases; /* fifo list */
531 struct list_head dentry_dir_leases; /* lru list */
532
533 struct ceph_client_metric metric;
534
535 spinlock_t snapid_map_lock;
536 struct rb_root snapid_map_tree;
537 struct list_head snapid_map_lru;
538
539 struct rw_semaphore pool_perm_rwsem;
540 struct rb_root pool_perm_tree;
541
542 u32 s_cap_auths_num;
543 struct ceph_mds_cap_auth *s_cap_auths;
544
545 char nodename[__NEW_UTS_LEN + 1];
546};
547
548extern const char *ceph_mds_op_name(int op);
549
550extern bool check_session_state(struct ceph_mds_session *s);
551void inc_session_sequence(struct ceph_mds_session *s);
552
553extern struct ceph_mds_session *
554__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
555
556extern const char *ceph_session_state_name(int s);
557
558extern struct ceph_mds_session *
559ceph_get_mds_session(struct ceph_mds_session *s);
560extern void ceph_put_mds_session(struct ceph_mds_session *s);
561
562extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
563extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
564extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
565extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
566
567extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
568
569extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
570extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
571 struct inode *dir);
572extern struct ceph_mds_request *
573ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
574extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
575 struct inode *dir,
576 struct ceph_mds_request *req);
577int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
578 struct ceph_mds_request *req,
579 ceph_mds_request_wait_callback_t wait_func);
580extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
581 struct inode *dir,
582 struct ceph_mds_request *req);
583extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
584extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
585static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
586{
587 kref_get(&req->r_kref);
588}
589extern void ceph_mdsc_release_request(struct kref *kref);
590static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
591{
592 kref_put(&req->r_kref, ceph_mdsc_release_request);
593}
594
595extern void send_flush_mdlog(struct ceph_mds_session *s);
596extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
597 void (*cb)(struct ceph_mds_session *),
598 bool check_state);
599extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
600extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
601 struct ceph_cap *cap);
602extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
603 struct ceph_mds_session *session);
604extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
605extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
606extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
607extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
608 int (*cb)(struct inode *, int mds, void *),
609 void *arg);
610extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,
611 int mask);
612
613extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
614
615static inline void ceph_mdsc_free_path(char *path, int len)
616{
617 if (!IS_ERR_OR_NULL(path))
618 __putname(path - (PATH_MAX - 1 - len));
619}
620
621extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
622 struct dentry *dentry, int *plen, u64 *base,
623 int for_wire);
624
625extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
626extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
627 struct dentry *dentry, char action,
628 u32 seq);
629
630extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
631 struct ceph_msg *msg);
632extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
633 struct ceph_msg *msg);
634
635extern struct ceph_mds_session *
636ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
637
638extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
639 struct ceph_mds_session *session,
640 int max_caps);
641
642static inline int ceph_wait_on_async_create(struct inode *inode)
643{
644 struct ceph_inode_info *ci = ceph_inode(inode);
645
646 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
647 TASK_KILLABLE);
648}
649
650extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
651extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
652extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
653
654extern bool enable_unsafe_idmap;
655#endif
1#ifndef _FS_CEPH_MDS_CLIENT_H
2#define _FS_CEPH_MDS_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/kref.h>
6#include <linux/list.h>
7#include <linux/mutex.h>
8#include <linux/rbtree.h>
9#include <linux/spinlock.h>
10
11#include <linux/ceph/types.h>
12#include <linux/ceph/messenger.h>
13#include <linux/ceph/mdsmap.h>
14#include <linux/ceph/auth.h>
15
16/*
17 * Some lock dependencies:
18 *
19 * session->s_mutex
20 * mdsc->mutex
21 *
22 * mdsc->snap_rwsem
23 *
24 * ci->i_ceph_lock
25 * mdsc->snap_flush_lock
26 * mdsc->cap_delay_lock
27 *
28 */
29
30struct ceph_fs_client;
31struct ceph_cap;
32
33/*
34 * parsed info about a single inode. pointers are into the encoded
35 * on-wire structures within the mds reply message payload.
36 */
37struct ceph_mds_reply_info_in {
38 struct ceph_mds_reply_inode *in;
39 struct ceph_dir_layout dir_layout;
40 u32 symlink_len;
41 char *symlink;
42 u32 xattr_len;
43 char *xattr_data;
44 u64 inline_version;
45 u32 inline_len;
46 char *inline_data;
47 u32 pool_ns_len;
48};
49
50/*
51 * parsed info about an mds reply, including information about
52 * either: 1) the target inode and/or its parent directory and dentry,
53 * and directory contents (for readdir results), or
54 * 2) the file range lock info (for fcntl F_GETLK results).
55 */
56struct ceph_mds_reply_info_parsed {
57 struct ceph_mds_reply_head *head;
58
59 /* trace */
60 struct ceph_mds_reply_info_in diri, targeti;
61 struct ceph_mds_reply_dirfrag *dirfrag;
62 char *dname;
63 u32 dname_len;
64 struct ceph_mds_reply_lease *dlease;
65
66 /* extra */
67 union {
68 /* for fcntl F_GETLK results */
69 struct ceph_filelock *filelock_reply;
70
71 /* for readdir results */
72 struct {
73 struct ceph_mds_reply_dirfrag *dir_dir;
74 size_t dir_buf_size;
75 int dir_nr;
76 char **dir_dname;
77 u32 *dir_dname_len;
78 struct ceph_mds_reply_lease **dir_dlease;
79 struct ceph_mds_reply_info_in *dir_in;
80 u8 dir_complete, dir_end;
81 };
82
83 /* for create results */
84 struct {
85 bool has_create_ino;
86 u64 ino;
87 };
88 };
89
90 /* encoded blob describing snapshot contexts for certain
91 operations (e.g., open) */
92 void *snapblob;
93 int snapblob_len;
94};
95
96
97/*
98 * cap releases are batched and sent to the MDS en masse.
99 */
100#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - \
101 sizeof(struct ceph_mds_cap_release)) / \
102 sizeof(struct ceph_mds_cap_item))
103
104
105/*
106 * state associated with each MDS<->client session
107 */
108enum {
109 CEPH_MDS_SESSION_NEW = 1,
110 CEPH_MDS_SESSION_OPENING = 2,
111 CEPH_MDS_SESSION_OPEN = 3,
112 CEPH_MDS_SESSION_HUNG = 4,
113 CEPH_MDS_SESSION_CLOSING = 5,
114 CEPH_MDS_SESSION_RESTARTING = 6,
115 CEPH_MDS_SESSION_RECONNECTING = 7,
116};
117
118struct ceph_mds_session {
119 struct ceph_mds_client *s_mdsc;
120 int s_mds;
121 int s_state;
122 unsigned long s_ttl; /* time until mds kills us */
123 u64 s_seq; /* incoming msg seq # */
124 struct mutex s_mutex; /* serialize session messages */
125
126 struct ceph_connection s_con;
127
128 struct ceph_auth_handshake s_auth;
129
130 /* protected by s_gen_ttl_lock */
131 spinlock_t s_gen_ttl_lock;
132 u32 s_cap_gen; /* inc each time we get mds stale msg */
133 unsigned long s_cap_ttl; /* when session caps expire */
134
135 /* protected by s_cap_lock */
136 spinlock_t s_cap_lock;
137 struct list_head s_caps; /* all caps issued by this session */
138 int s_nr_caps, s_trim_caps;
139 int s_num_cap_releases;
140 int s_cap_reconnect;
141 int s_readonly;
142 struct list_head s_cap_releases; /* waiting cap_release messages */
143 struct ceph_cap *s_cap_iterator;
144
145 /* protected by mutex */
146 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
147 struct list_head s_cap_snaps_flushing;
148 unsigned long s_renew_requested; /* last time we sent a renew req */
149 u64 s_renew_seq;
150
151 atomic_t s_ref;
152 struct list_head s_waiting; /* waiting requests */
153 struct list_head s_unsafe; /* unsafe requests */
154};
155
156/*
157 * modes of choosing which MDS to send a request to
158 */
159enum {
160 USE_ANY_MDS,
161 USE_RANDOM_MDS,
162 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
163};
164
165struct ceph_mds_request;
166struct ceph_mds_client;
167
168/*
169 * request completion callback
170 */
171typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
172 struct ceph_mds_request *req);
173/*
174 * wait for request completion callback
175 */
176typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
177 struct ceph_mds_request *req);
178
179/*
180 * an in-flight mds request
181 */
182struct ceph_mds_request {
183 u64 r_tid; /* transaction id */
184 struct rb_node r_node;
185 struct ceph_mds_client *r_mdsc;
186
187 int r_op; /* mds op code */
188
189 /* operation on what? */
190 struct inode *r_inode; /* arg1 */
191 struct dentry *r_dentry; /* arg1 */
192 struct dentry *r_old_dentry; /* arg2: rename from or link from */
193 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
194 char *r_path1, *r_path2;
195 struct ceph_vino r_ino1, r_ino2;
196
197 struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
198 struct inode *r_target_inode; /* resulting inode */
199
200 struct mutex r_fill_mutex;
201
202 union ceph_mds_request_args r_args;
203 int r_fmode; /* file mode, if expecting cap */
204 kuid_t r_uid;
205 kgid_t r_gid;
206 struct timespec r_stamp;
207
208 /* for choosing which mds to send this request to */
209 int r_direct_mode;
210 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
211 bool r_direct_is_hash; /* true if r_direct_hash is valid */
212
213 /* data payload is used for xattr ops */
214 struct ceph_pagelist *r_pagelist;
215
216 /* what caps shall we drop? */
217 int r_inode_drop, r_inode_unless;
218 int r_dentry_drop, r_dentry_unless;
219 int r_old_dentry_drop, r_old_dentry_unless;
220 struct inode *r_old_inode;
221 int r_old_inode_drop, r_old_inode_unless;
222
223 struct ceph_msg *r_request; /* original request */
224 int r_request_release_offset;
225 struct ceph_msg *r_reply;
226 struct ceph_mds_reply_info_parsed r_reply_info;
227 struct page *r_locked_page;
228 int r_err;
229 bool r_aborted;
230
231 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
232 unsigned long r_started; /* start time to measure timeout against */
233 unsigned long r_request_started; /* start time for mds request only,
234 used to measure lease durations */
235
236 /* link unsafe requests to parent directory, for fsync */
237 struct inode *r_unsafe_dir;
238 struct list_head r_unsafe_dir_item;
239
240 /* unsafe requests that modify the target inode */
241 struct list_head r_unsafe_target_item;
242
243 struct ceph_mds_session *r_session;
244
245 int r_attempts; /* resend attempts */
246 int r_num_fwd; /* number of forward attempts */
247 int r_resend_mds; /* mds to resend to next, if any*/
248 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
249
250 struct kref r_kref;
251 struct list_head r_wait;
252 struct completion r_completion;
253 struct completion r_safe_completion;
254 ceph_mds_request_callback_t r_callback;
255 ceph_mds_request_wait_callback_t r_wait_for_completion;
256 struct list_head r_unsafe_item; /* per-session unsafe list item */
257 bool r_got_unsafe, r_got_safe, r_got_result;
258
259 bool r_did_prepopulate;
260 long long r_dir_release_cnt;
261 long long r_dir_ordered_cnt;
262 int r_readdir_cache_idx;
263 u32 r_readdir_offset;
264
265 struct ceph_cap_reservation r_caps_reservation;
266 int r_num_caps;
267};
268
269struct ceph_pool_perm {
270 struct rb_node node;
271 u32 pool;
272 int perm;
273};
274
275/*
276 * mds client state
277 */
278struct ceph_mds_client {
279 struct ceph_fs_client *fsc;
280 struct mutex mutex; /* all nested structures */
281
282 struct ceph_mdsmap *mdsmap;
283 struct completion safe_umount_waiters;
284 wait_queue_head_t session_close_wq;
285 struct list_head waiting_for_map;
286
287 struct ceph_mds_session **sessions; /* NULL for mds if no session */
288 atomic_t num_sessions;
289 int max_sessions; /* len of s_mds_sessions */
290 int stopping; /* true if shutting down */
291
292 /*
293 * snap_rwsem will cover cap linkage into snaprealms, and
294 * realm snap contexts. (later, we can do per-realm snap
295 * contexts locks..) the empty list contains realms with no
296 * references (implying they contain no inodes with caps) that
297 * should be destroyed.
298 */
299 u64 last_snap_seq;
300 struct rw_semaphore snap_rwsem;
301 struct rb_root snap_realms;
302 struct list_head snap_empty;
303 spinlock_t snap_empty_lock; /* protect snap_empty */
304
305 u64 last_tid; /* most recent mds request */
306 u64 oldest_tid; /* oldest incomplete mds request,
307 excluding setfilelock requests */
308 struct rb_root request_tree; /* pending mds requests */
309 struct delayed_work delayed_work; /* delayed work */
310 unsigned long last_renew_caps; /* last time we renewed our caps */
311 struct list_head cap_delay_list; /* caps with delayed release */
312 spinlock_t cap_delay_lock; /* protects cap_delay_list */
313 struct list_head snap_flush_list; /* cap_snaps ready to flush */
314 spinlock_t snap_flush_lock;
315
316 u64 last_cap_flush_tid;
317 struct rb_root cap_flush_tree;
318 struct list_head cap_dirty; /* inodes with dirty caps */
319 struct list_head cap_dirty_migrating; /* ...that are migration... */
320 int num_cap_flushing; /* # caps we are flushing */
321 spinlock_t cap_dirty_lock; /* protects above items */
322 wait_queue_head_t cap_flushing_wq;
323
324 /*
325 * Cap reservations
326 *
327 * Maintain a global pool of preallocated struct ceph_caps, referenced
328 * by struct ceph_caps_reservations. This ensures that we preallocate
329 * memory needed to successfully process an MDS response. (If an MDS
330 * sends us cap information and we fail to process it, we will have
331 * problems due to the client and MDS being out of sync.)
332 *
333 * Reservations are 'owned' by a ceph_cap_reservation context.
334 */
335 spinlock_t caps_list_lock;
336 struct list_head caps_list; /* unused (reserved or
337 unreserved) */
338 int caps_total_count; /* total caps allocated */
339 int caps_use_count; /* in use */
340 int caps_reserve_count; /* unused, reserved */
341 int caps_avail_count; /* unused, unreserved */
342 int caps_min_count; /* keep at least this many
343 (unreserved) */
344 spinlock_t dentry_lru_lock;
345 struct list_head dentry_lru;
346 int num_dentry;
347
348 struct rw_semaphore pool_perm_rwsem;
349 struct rb_root pool_perm_tree;
350};
351
352extern const char *ceph_mds_op_name(int op);
353
354extern struct ceph_mds_session *
355__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
356
357static inline struct ceph_mds_session *
358ceph_get_mds_session(struct ceph_mds_session *s)
359{
360 atomic_inc(&s->s_ref);
361 return s;
362}
363
364extern const char *ceph_session_state_name(int s);
365
366extern void ceph_put_mds_session(struct ceph_mds_session *s);
367
368extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
369 struct ceph_msg *msg, int mds);
370
371extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
372extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
373extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
374extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
375
376extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
377
378extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
379 struct inode *inode,
380 struct dentry *dn);
381
382extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
383extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
384 struct inode *dir);
385extern struct ceph_mds_request *
386ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
387extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
388 struct ceph_mds_request *req);
389extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
390 struct inode *dir,
391 struct ceph_mds_request *req);
392static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
393{
394 kref_get(&req->r_kref);
395}
396extern void ceph_mdsc_release_request(struct kref *kref);
397static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
398{
399 kref_put(&req->r_kref, ceph_mdsc_release_request);
400}
401
402extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
403 struct ceph_mds_session *session);
404
405extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
406
407extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
408 int stop_on_nosnap);
409
410extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
411extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
412 struct inode *inode,
413 struct dentry *dentry, char action,
414 u32 seq);
415
416extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
417 struct ceph_msg *msg);
418
419extern struct ceph_mds_session *
420ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
421extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
422 struct ceph_mds_session *session);
423
424#endif