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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2f2dc053 SW |
2 | #ifndef _FS_CEPH_MDS_CLIENT_H |
3 | #define _FS_CEPH_MDS_CLIENT_H | |
4 | ||
5 | #include <linux/completion.h> | |
153c8e6b | 6 | #include <linux/kref.h> |
2f2dc053 SW |
7 | #include <linux/list.h> |
8 | #include <linux/mutex.h> | |
44ca18f2 | 9 | #include <linux/rbtree.h> |
2f2dc053 | 10 | #include <linux/spinlock.h> |
3997c01d | 11 | #include <linux/refcount.h> |
717e6f28 | 12 | #include <linux/utsname.h> |
2f2dc053 | 13 | |
3d14c5d2 YS |
14 | #include <linux/ceph/types.h> |
15 | #include <linux/ceph/messenger.h> | |
16 | #include <linux/ceph/mdsmap.h> | |
6c4a1915 | 17 | #include <linux/ceph/auth.h> |
2f2dc053 SW |
18 | |
19 | /* | |
20 | * Some lock dependencies: | |
21 | * | |
22 | * session->s_mutex | |
23 | * mdsc->mutex | |
24 | * | |
25 | * mdsc->snap_rwsem | |
26 | * | |
be655596 | 27 | * ci->i_ceph_lock |
2f2dc053 SW |
28 | * mdsc->snap_flush_lock |
29 | * mdsc->cap_delay_lock | |
30 | * | |
31 | */ | |
32 | ||
3d14c5d2 | 33 | struct ceph_fs_client; |
2f2dc053 SW |
34 | struct ceph_cap; |
35 | ||
36 | /* | |
37 | * parsed info about a single inode. pointers are into the encoded | |
38 | * on-wire structures within the mds reply message payload. | |
39 | */ | |
40 | struct ceph_mds_reply_info_in { | |
41 | struct ceph_mds_reply_inode *in; | |
14303d20 | 42 | struct ceph_dir_layout dir_layout; |
2f2dc053 SW |
43 | u32 symlink_len; |
44 | char *symlink; | |
45 | u32 xattr_len; | |
46 | char *xattr_data; | |
fb01d1f8 YZ |
47 | u64 inline_version; |
48 | u32 inline_len; | |
49 | char *inline_data; | |
5ea5c5e0 | 50 | u32 pool_ns_len; |
779fe0fb | 51 | char *pool_ns_data; |
2f2dc053 SW |
52 | }; |
53 | ||
2a5beea3 YZ |
54 | struct ceph_mds_reply_dir_entry { |
55 | char *name; | |
56 | u32 name_len; | |
57 | struct ceph_mds_reply_lease *lease; | |
58 | struct ceph_mds_reply_info_in inode; | |
8974eebd | 59 | loff_t offset; |
2a5beea3 YZ |
60 | }; |
61 | ||
2f2dc053 | 62 | /* |
25933abd HS |
63 | * parsed info about an mds reply, including information about |
64 | * either: 1) the target inode and/or its parent directory and dentry, | |
65 | * and directory contents (for readdir results), or | |
66 | * 2) the file range lock info (for fcntl F_GETLK results). | |
2f2dc053 SW |
67 | */ |
68 | struct ceph_mds_reply_info_parsed { | |
69 | struct ceph_mds_reply_head *head; | |
70 | ||
25933abd | 71 | /* trace */ |
2f2dc053 SW |
72 | struct ceph_mds_reply_info_in diri, targeti; |
73 | struct ceph_mds_reply_dirfrag *dirfrag; | |
74 | char *dname; | |
75 | u32 dname_len; | |
76 | struct ceph_mds_reply_lease *dlease; | |
77 | ||
25933abd HS |
78 | /* extra */ |
79 | union { | |
80 | /* for fcntl F_GETLK results */ | |
81 | struct ceph_filelock *filelock_reply; | |
82 | ||
83 | /* for readdir results */ | |
84 | struct { | |
85 | struct ceph_mds_reply_dirfrag *dir_dir; | |
54008399 | 86 | size_t dir_buf_size; |
25933abd | 87 | int dir_nr; |
f3c4ebe6 | 88 | bool dir_end; |
79162547 | 89 | bool dir_complete; |
f3c4ebe6 | 90 | bool hash_order; |
79162547 | 91 | bool offset_hash; |
2a5beea3 | 92 | struct ceph_mds_reply_dir_entry *dir_entries; |
25933abd | 93 | }; |
6e8575fa SL |
94 | |
95 | /* for create results */ | |
96 | struct { | |
97 | bool has_create_ino; | |
98 | u64 ino; | |
99 | }; | |
25933abd | 100 | }; |
2f2dc053 SW |
101 | |
102 | /* encoded blob describing snapshot contexts for certain | |
103 | operations (e.g., open) */ | |
104 | void *snapblob; | |
105 | int snapblob_len; | |
106 | }; | |
107 | ||
108 | ||
109 | /* | |
110 | * cap releases are batched and sent to the MDS en masse. | |
92475f05 JL |
111 | * |
112 | * Account for per-message overhead of mds_cap_release header | |
113 | * and __le32 for osd epoch barrier trailing field. | |
2f2dc053 | 114 | */ |
92475f05 | 115 | #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \ |
2f2dc053 | 116 | sizeof(struct ceph_mds_cap_release)) / \ |
92475f05 | 117 | sizeof(struct ceph_mds_cap_item)) |
2f2dc053 SW |
118 | |
119 | ||
120 | /* | |
121 | * state associated with each MDS<->client session | |
122 | */ | |
123 | enum { | |
124 | CEPH_MDS_SESSION_NEW = 1, | |
125 | CEPH_MDS_SESSION_OPENING = 2, | |
126 | CEPH_MDS_SESSION_OPEN = 3, | |
127 | CEPH_MDS_SESSION_HUNG = 4, | |
128 | CEPH_MDS_SESSION_CLOSING = 5, | |
129 | CEPH_MDS_SESSION_RESTARTING = 6, | |
130 | CEPH_MDS_SESSION_RECONNECTING = 7, | |
fcff415c | 131 | CEPH_MDS_SESSION_REJECTED = 8, |
2f2dc053 SW |
132 | }; |
133 | ||
134 | struct ceph_mds_session { | |
135 | struct ceph_mds_client *s_mdsc; | |
136 | int s_mds; | |
137 | int s_state; | |
138 | unsigned long s_ttl; /* time until mds kills us */ | |
139 | u64 s_seq; /* incoming msg seq # */ | |
140 | struct mutex s_mutex; /* serialize session messages */ | |
141 | ||
142 | struct ceph_connection s_con; | |
143 | ||
6c4a1915 | 144 | struct ceph_auth_handshake s_auth; |
4e7a5dcd | 145 | |
d8fb02ab AE |
146 | /* protected by s_gen_ttl_lock */ |
147 | spinlock_t s_gen_ttl_lock; | |
2f2dc053 SW |
148 | u32 s_cap_gen; /* inc each time we get mds stale msg */ |
149 | unsigned long s_cap_ttl; /* when session caps expire */ | |
d8fb02ab AE |
150 | |
151 | /* protected by s_cap_lock */ | |
152 | spinlock_t s_cap_lock; | |
2f2dc053 SW |
153 | struct list_head s_caps; /* all caps issued by this session */ |
154 | int s_nr_caps, s_trim_caps; | |
155 | int s_num_cap_releases; | |
99a9c273 | 156 | int s_cap_reconnect; |
03f4fcb0 | 157 | int s_readonly; |
2f2dc053 | 158 | struct list_head s_cap_releases; /* waiting cap_release messages */ |
7c1332b8 | 159 | struct ceph_cap *s_cap_iterator; |
2f2dc053 SW |
160 | |
161 | /* protected by mutex */ | |
162 | struct list_head s_cap_flushing; /* inodes w/ flushing caps */ | |
2f2dc053 SW |
163 | unsigned long s_renew_requested; /* last time we sent a renew req */ |
164 | u64 s_renew_seq; | |
165 | ||
3997c01d | 166 | refcount_t s_ref; |
2f2dc053 SW |
167 | struct list_head s_waiting; /* waiting requests */ |
168 | struct list_head s_unsafe; /* unsafe requests */ | |
169 | }; | |
170 | ||
171 | /* | |
172 | * modes of choosing which MDS to send a request to | |
173 | */ | |
174 | enum { | |
175 | USE_ANY_MDS, | |
176 | USE_RANDOM_MDS, | |
177 | USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ | |
178 | }; | |
179 | ||
180 | struct ceph_mds_request; | |
181 | struct ceph_mds_client; | |
182 | ||
183 | /* | |
184 | * request completion callback | |
185 | */ | |
186 | typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, | |
187 | struct ceph_mds_request *req); | |
9280be24 YZ |
188 | /* |
189 | * wait for request completion callback | |
190 | */ | |
191 | typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, | |
192 | struct ceph_mds_request *req); | |
2f2dc053 SW |
193 | |
194 | /* | |
195 | * an in-flight mds request | |
196 | */ | |
197 | struct ceph_mds_request { | |
198 | u64 r_tid; /* transaction id */ | |
44ca18f2 | 199 | struct rb_node r_node; |
37151668 | 200 | struct ceph_mds_client *r_mdsc; |
2f2dc053 SW |
201 | |
202 | int r_op; /* mds op code */ | |
2f2dc053 SW |
203 | |
204 | /* operation on what? */ | |
205 | struct inode *r_inode; /* arg1 */ | |
206 | struct dentry *r_dentry; /* arg1 */ | |
207 | struct dentry *r_old_dentry; /* arg2: rename from or link from */ | |
41b02e1f | 208 | struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ |
2f2dc053 SW |
209 | char *r_path1, *r_path2; |
210 | struct ceph_vino r_ino1, r_ino2; | |
211 | ||
3dd69aab | 212 | struct inode *r_parent; /* parent dir inode */ |
2f2dc053 SW |
213 | struct inode *r_target_inode; /* resulting inode */ |
214 | ||
bc2de10d JL |
215 | #define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */ |
216 | #define CEPH_MDS_R_ABORTED (2) /* call was aborted */ | |
217 | #define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */ | |
218 | #define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */ | |
219 | #define CEPH_MDS_R_GOT_RESULT (5) /* got a result */ | |
220 | #define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */ | |
3dd69aab | 221 | #define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */ |
bc2de10d JL |
222 | unsigned long r_req_flags; |
223 | ||
b4556396 SW |
224 | struct mutex r_fill_mutex; |
225 | ||
2f2dc053 SW |
226 | union ceph_mds_request_args r_args; |
227 | int r_fmode; /* file mode, if expecting cap */ | |
ff3d0046 EB |
228 | kuid_t r_uid; |
229 | kgid_t r_gid; | |
b8e69066 | 230 | struct timespec r_stamp; |
2f2dc053 SW |
231 | |
232 | /* for choosing which mds to send this request to */ | |
233 | int r_direct_mode; | |
234 | u32 r_direct_hash; /* choose dir frag based on this dentry hash */ | |
2f2dc053 SW |
235 | |
236 | /* data payload is used for xattr ops */ | |
25e6bae3 | 237 | struct ceph_pagelist *r_pagelist; |
2f2dc053 SW |
238 | |
239 | /* what caps shall we drop? */ | |
240 | int r_inode_drop, r_inode_unless; | |
241 | int r_dentry_drop, r_dentry_unless; | |
242 | int r_old_dentry_drop, r_old_dentry_unless; | |
243 | struct inode *r_old_inode; | |
244 | int r_old_inode_drop, r_old_inode_unless; | |
245 | ||
246 | struct ceph_msg *r_request; /* original request */ | |
e979cf50 | 247 | int r_request_release_offset; |
2f2dc053 SW |
248 | struct ceph_msg *r_reply; |
249 | struct ceph_mds_reply_info_parsed r_reply_info; | |
01deead0 | 250 | struct page *r_locked_page; |
2f2dc053 SW |
251 | int r_err; |
252 | ||
a319bf56 | 253 | unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ |
2f2dc053 SW |
254 | unsigned long r_started; /* start time to measure timeout against */ |
255 | unsigned long r_request_started; /* start time for mds request only, | |
256 | used to measure lease durations */ | |
257 | ||
258 | /* link unsafe requests to parent directory, for fsync */ | |
259 | struct inode *r_unsafe_dir; | |
260 | struct list_head r_unsafe_dir_item; | |
261 | ||
68cd5b4b YZ |
262 | /* unsafe requests that modify the target inode */ |
263 | struct list_head r_unsafe_target_item; | |
264 | ||
2f2dc053 SW |
265 | struct ceph_mds_session *r_session; |
266 | ||
267 | int r_attempts; /* resend attempts */ | |
268 | int r_num_fwd; /* number of forward attempts */ | |
2f2dc053 | 269 | int r_resend_mds; /* mds to resend to next, if any*/ |
e55b71f8 | 270 | u32 r_sent_on_mseq; /* cap mseq request was sent at*/ |
2f2dc053 | 271 | |
153c8e6b | 272 | struct kref r_kref; |
2f2dc053 SW |
273 | struct list_head r_wait; |
274 | struct completion r_completion; | |
275 | struct completion r_safe_completion; | |
276 | ceph_mds_request_callback_t r_callback; | |
9280be24 | 277 | ceph_mds_request_wait_callback_t r_wait_for_completion; |
2f2dc053 | 278 | struct list_head r_unsafe_item; /* per-session unsafe list item */ |
2f2dc053 | 279 | |
fdd4e158 YZ |
280 | long long r_dir_release_cnt; |
281 | long long r_dir_ordered_cnt; | |
282 | int r_readdir_cache_idx; | |
2f2dc053 SW |
283 | u32 r_readdir_offset; |
284 | ||
285 | struct ceph_cap_reservation r_caps_reservation; | |
286 | int r_num_caps; | |
287 | }; | |
288 | ||
10183a69 YZ |
289 | struct ceph_pool_perm { |
290 | struct rb_node node; | |
10183a69 | 291 | int perm; |
7627151e | 292 | s64 pool; |
779fe0fb YZ |
293 | size_t pool_ns_len; |
294 | char pool_ns[]; | |
10183a69 YZ |
295 | }; |
296 | ||
2f2dc053 SW |
297 | /* |
298 | * mds client state | |
299 | */ | |
300 | struct ceph_mds_client { | |
3d14c5d2 | 301 | struct ceph_fs_client *fsc; |
2f2dc053 SW |
302 | struct mutex mutex; /* all nested structures */ |
303 | ||
304 | struct ceph_mdsmap *mdsmap; | |
f3c60c59 SW |
305 | struct completion safe_umount_waiters; |
306 | wait_queue_head_t session_close_wq; | |
2f2dc053 | 307 | struct list_head waiting_for_map; |
430afbad | 308 | int mdsmap_err; |
2f2dc053 SW |
309 | |
310 | struct ceph_mds_session **sessions; /* NULL for mds if no session */ | |
86d8f67b | 311 | atomic_t num_sessions; |
2f2dc053 SW |
312 | int max_sessions; /* len of s_mds_sessions */ |
313 | int stopping; /* true if shutting down */ | |
314 | ||
315 | /* | |
316 | * snap_rwsem will cover cap linkage into snaprealms, and | |
317 | * realm snap contexts. (later, we can do per-realm snap | |
318 | * contexts locks..) the empty list contains realms with no | |
319 | * references (implying they contain no inodes with caps) that | |
320 | * should be destroyed. | |
321 | */ | |
affbc19a | 322 | u64 last_snap_seq; |
2f2dc053 | 323 | struct rw_semaphore snap_rwsem; |
a105f00c | 324 | struct rb_root snap_realms; |
2f2dc053 SW |
325 | struct list_head snap_empty; |
326 | spinlock_t snap_empty_lock; /* protect snap_empty */ | |
327 | ||
328 | u64 last_tid; /* most recent mds request */ | |
e8a7b8b1 YZ |
329 | u64 oldest_tid; /* oldest incomplete mds request, |
330 | excluding setfilelock requests */ | |
44ca18f2 | 331 | struct rb_root request_tree; /* pending mds requests */ |
2f2dc053 SW |
332 | struct delayed_work delayed_work; /* delayed work */ |
333 | unsigned long last_renew_caps; /* last time we renewed our caps */ | |
334 | struct list_head cap_delay_list; /* caps with delayed release */ | |
335 | spinlock_t cap_delay_lock; /* protects cap_delay_list */ | |
336 | struct list_head snap_flush_list; /* cap_snaps ready to flush */ | |
337 | spinlock_t snap_flush_lock; | |
338 | ||
553adfd9 | 339 | u64 last_cap_flush_tid; |
e4500b5e | 340 | struct list_head cap_flush_list; |
2f2dc053 | 341 | struct list_head cap_dirty; /* inodes with dirty caps */ |
db354052 | 342 | struct list_head cap_dirty_migrating; /* ...that are migration... */ |
2f2dc053 SW |
343 | int num_cap_flushing; /* # caps we are flushing */ |
344 | spinlock_t cap_dirty_lock; /* protects above items */ | |
345 | wait_queue_head_t cap_flushing_wq; | |
346 | ||
37151668 YS |
347 | /* |
348 | * Cap reservations | |
349 | * | |
350 | * Maintain a global pool of preallocated struct ceph_caps, referenced | |
351 | * by struct ceph_caps_reservations. This ensures that we preallocate | |
352 | * memory needed to successfully process an MDS response. (If an MDS | |
353 | * sends us cap information and we fail to process it, we will have | |
354 | * problems due to the client and MDS being out of sync.) | |
355 | * | |
356 | * Reservations are 'owned' by a ceph_cap_reservation context. | |
357 | */ | |
358 | spinlock_t caps_list_lock; | |
359 | struct list_head caps_list; /* unused (reserved or | |
360 | unreserved) */ | |
361 | int caps_total_count; /* total caps allocated */ | |
362 | int caps_use_count; /* in use */ | |
363 | int caps_reserve_count; /* unused, reserved */ | |
364 | int caps_avail_count; /* unused, unreserved */ | |
365 | int caps_min_count; /* keep at least this many | |
366 | (unreserved) */ | |
2f2dc053 SW |
367 | spinlock_t dentry_lru_lock; |
368 | struct list_head dentry_lru; | |
369 | int num_dentry; | |
10183a69 YZ |
370 | |
371 | struct rw_semaphore pool_perm_rwsem; | |
372 | struct rb_root pool_perm_tree; | |
717e6f28 YZ |
373 | |
374 | char nodename[__NEW_UTS_LEN + 1]; | |
2f2dc053 SW |
375 | }; |
376 | ||
377 | extern const char *ceph_mds_op_name(int op); | |
378 | ||
379 | extern struct ceph_mds_session * | |
380 | __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); | |
381 | ||
382 | static inline struct ceph_mds_session * | |
383 | ceph_get_mds_session(struct ceph_mds_session *s) | |
384 | { | |
3997c01d | 385 | refcount_inc(&s->s_ref); |
2f2dc053 SW |
386 | return s; |
387 | } | |
388 | ||
a687ecaf JS |
389 | extern const char *ceph_session_state_name(int s); |
390 | ||
2f2dc053 SW |
391 | extern void ceph_put_mds_session(struct ceph_mds_session *s); |
392 | ||
393 | extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, | |
394 | struct ceph_msg *msg, int mds); | |
395 | ||
3d14c5d2 | 396 | extern int ceph_mdsc_init(struct ceph_fs_client *fsc); |
2f2dc053 | 397 | extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); |
48fec5d0 | 398 | extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); |
3d14c5d2 | 399 | extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); |
2f2dc053 SW |
400 | |
401 | extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); | |
402 | ||
167c9e35 | 403 | extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); |
54008399 YZ |
404 | extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
405 | struct inode *dir); | |
2f2dc053 SW |
406 | extern struct ceph_mds_request * |
407 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); | |
408 | extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
409 | struct ceph_mds_request *req); | |
410 | extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
411 | struct inode *dir, | |
412 | struct ceph_mds_request *req); | |
413 | static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) | |
414 | { | |
153c8e6b SW |
415 | kref_get(&req->r_kref); |
416 | } | |
417 | extern void ceph_mdsc_release_request(struct kref *kref); | |
418 | static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) | |
419 | { | |
420 | kref_put(&req->r_kref, ceph_mdsc_release_request); | |
2f2dc053 | 421 | } |
2f2dc053 | 422 | |
3d7ded4d SW |
423 | extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
424 | struct ceph_mds_session *session); | |
425 | ||
2f2dc053 SW |
426 | extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); |
427 | ||
428 | extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
429 | int stop_on_nosnap); | |
430 | ||
431 | extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); | |
432 | extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
433 | struct inode *inode, | |
434 | struct dentry *dentry, char action, | |
435 | u32 seq); | |
436 | ||
430afbad YZ |
437 | extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, |
438 | struct ceph_msg *msg); | |
439 | extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, | |
440 | struct ceph_msg *msg); | |
2f2dc053 | 441 | |
5d72d13c YZ |
442 | extern struct ceph_mds_session * |
443 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); | |
154f42c2 SW |
444 | extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
445 | struct ceph_mds_session *session); | |
446 | ||
2f2dc053 | 447 | #endif |