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