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2f2dc053 SW |
1 | #ifndef _FS_CEPH_MDS_CLIENT_H |
2 | #define _FS_CEPH_MDS_CLIENT_H | |
3 | ||
4 | #include <linux/completion.h> | |
153c8e6b | 5 | #include <linux/kref.h> |
2f2dc053 SW |
6 | #include <linux/list.h> |
7 | #include <linux/mutex.h> | |
44ca18f2 | 8 | #include <linux/rbtree.h> |
2f2dc053 SW |
9 | #include <linux/spinlock.h> |
10 | ||
3d14c5d2 YS |
11 | #include <linux/ceph/types.h> |
12 | #include <linux/ceph/messenger.h> | |
13 | #include <linux/ceph/mdsmap.h> | |
6c4a1915 | 14 | #include <linux/ceph/auth.h> |
2f2dc053 SW |
15 | |
16 | /* | |
17 | * Some lock dependencies: | |
18 | * | |
19 | * session->s_mutex | |
20 | * mdsc->mutex | |
21 | * | |
22 | * mdsc->snap_rwsem | |
23 | * | |
be655596 | 24 | * ci->i_ceph_lock |
2f2dc053 SW |
25 | * mdsc->snap_flush_lock |
26 | * mdsc->cap_delay_lock | |
27 | * | |
28 | */ | |
29 | ||
3d14c5d2 | 30 | struct ceph_fs_client; |
2f2dc053 SW |
31 | struct 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 | */ | |
37 | struct ceph_mds_reply_info_in { | |
38 | struct ceph_mds_reply_inode *in; | |
14303d20 | 39 | struct ceph_dir_layout dir_layout; |
2f2dc053 SW |
40 | u32 symlink_len; |
41 | char *symlink; | |
42 | u32 xattr_len; | |
43 | char *xattr_data; | |
fb01d1f8 YZ |
44 | u64 inline_version; |
45 | u32 inline_len; | |
46 | char *inline_data; | |
5ea5c5e0 | 47 | u32 pool_ns_len; |
779fe0fb | 48 | char *pool_ns_data; |
2f2dc053 SW |
49 | }; |
50 | ||
2a5beea3 YZ |
51 | struct ceph_mds_reply_dir_entry { |
52 | char *name; | |
53 | u32 name_len; | |
54 | struct ceph_mds_reply_lease *lease; | |
55 | struct ceph_mds_reply_info_in inode; | |
8974eebd | 56 | loff_t offset; |
2a5beea3 YZ |
57 | }; |
58 | ||
2f2dc053 | 59 | /* |
25933abd HS |
60 | * parsed info about an mds reply, including information about |
61 | * either: 1) the target inode and/or its parent directory and dentry, | |
62 | * and directory contents (for readdir results), or | |
63 | * 2) the file range lock info (for fcntl F_GETLK results). | |
2f2dc053 SW |
64 | */ |
65 | struct ceph_mds_reply_info_parsed { | |
66 | struct ceph_mds_reply_head *head; | |
67 | ||
25933abd | 68 | /* trace */ |
2f2dc053 SW |
69 | struct ceph_mds_reply_info_in diri, targeti; |
70 | struct ceph_mds_reply_dirfrag *dirfrag; | |
71 | char *dname; | |
72 | u32 dname_len; | |
73 | struct ceph_mds_reply_lease *dlease; | |
74 | ||
25933abd HS |
75 | /* extra */ |
76 | union { | |
77 | /* for fcntl F_GETLK results */ | |
78 | struct ceph_filelock *filelock_reply; | |
79 | ||
80 | /* for readdir results */ | |
81 | struct { | |
82 | struct ceph_mds_reply_dirfrag *dir_dir; | |
54008399 | 83 | size_t dir_buf_size; |
25933abd | 84 | int dir_nr; |
f3c4ebe6 YZ |
85 | bool dir_complete; |
86 | bool dir_end; | |
87 | bool hash_order; | |
2a5beea3 | 88 | struct ceph_mds_reply_dir_entry *dir_entries; |
25933abd | 89 | }; |
6e8575fa SL |
90 | |
91 | /* for create results */ | |
92 | struct { | |
93 | bool has_create_ino; | |
94 | u64 ino; | |
95 | }; | |
25933abd | 96 | }; |
2f2dc053 SW |
97 | |
98 | /* encoded blob describing snapshot contexts for certain | |
99 | operations (e.g., open) */ | |
100 | void *snapblob; | |
101 | int snapblob_len; | |
102 | }; | |
103 | ||
104 | ||
105 | /* | |
106 | * cap releases are batched and sent to the MDS en masse. | |
107 | */ | |
09cbfeaf | 108 | #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - \ |
2f2dc053 SW |
109 | sizeof(struct ceph_mds_cap_release)) / \ |
110 | sizeof(struct ceph_mds_cap_item)) | |
111 | ||
112 | ||
113 | /* | |
114 | * state associated with each MDS<->client session | |
115 | */ | |
116 | enum { | |
117 | CEPH_MDS_SESSION_NEW = 1, | |
118 | CEPH_MDS_SESSION_OPENING = 2, | |
119 | CEPH_MDS_SESSION_OPEN = 3, | |
120 | CEPH_MDS_SESSION_HUNG = 4, | |
121 | CEPH_MDS_SESSION_CLOSING = 5, | |
122 | CEPH_MDS_SESSION_RESTARTING = 6, | |
123 | CEPH_MDS_SESSION_RECONNECTING = 7, | |
124 | }; | |
125 | ||
126 | struct ceph_mds_session { | |
127 | struct ceph_mds_client *s_mdsc; | |
128 | int s_mds; | |
129 | int s_state; | |
130 | unsigned long s_ttl; /* time until mds kills us */ | |
131 | u64 s_seq; /* incoming msg seq # */ | |
132 | struct mutex s_mutex; /* serialize session messages */ | |
133 | ||
134 | struct ceph_connection s_con; | |
135 | ||
6c4a1915 | 136 | struct ceph_auth_handshake s_auth; |
4e7a5dcd | 137 | |
d8fb02ab AE |
138 | /* protected by s_gen_ttl_lock */ |
139 | spinlock_t s_gen_ttl_lock; | |
2f2dc053 SW |
140 | u32 s_cap_gen; /* inc each time we get mds stale msg */ |
141 | unsigned long s_cap_ttl; /* when session caps expire */ | |
d8fb02ab AE |
142 | |
143 | /* protected by s_cap_lock */ | |
144 | spinlock_t s_cap_lock; | |
2f2dc053 SW |
145 | struct list_head s_caps; /* all caps issued by this session */ |
146 | int s_nr_caps, s_trim_caps; | |
147 | int s_num_cap_releases; | |
99a9c273 | 148 | int s_cap_reconnect; |
03f4fcb0 | 149 | int s_readonly; |
2f2dc053 | 150 | struct list_head s_cap_releases; /* waiting cap_release messages */ |
7c1332b8 | 151 | struct ceph_cap *s_cap_iterator; |
2f2dc053 SW |
152 | |
153 | /* protected by mutex */ | |
154 | struct list_head s_cap_flushing; /* inodes w/ flushing caps */ | |
155 | struct list_head s_cap_snaps_flushing; | |
156 | unsigned long s_renew_requested; /* last time we sent a renew req */ | |
157 | u64 s_renew_seq; | |
158 | ||
159 | atomic_t s_ref; | |
160 | struct list_head s_waiting; /* waiting requests */ | |
161 | struct list_head s_unsafe; /* unsafe requests */ | |
162 | }; | |
163 | ||
164 | /* | |
165 | * modes of choosing which MDS to send a request to | |
166 | */ | |
167 | enum { | |
168 | USE_ANY_MDS, | |
169 | USE_RANDOM_MDS, | |
170 | USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ | |
171 | }; | |
172 | ||
173 | struct ceph_mds_request; | |
174 | struct ceph_mds_client; | |
175 | ||
176 | /* | |
177 | * request completion callback | |
178 | */ | |
179 | typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, | |
180 | struct ceph_mds_request *req); | |
9280be24 YZ |
181 | /* |
182 | * wait for request completion callback | |
183 | */ | |
184 | typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, | |
185 | struct ceph_mds_request *req); | |
2f2dc053 SW |
186 | |
187 | /* | |
188 | * an in-flight mds request | |
189 | */ | |
190 | struct ceph_mds_request { | |
191 | u64 r_tid; /* transaction id */ | |
44ca18f2 | 192 | struct rb_node r_node; |
37151668 | 193 | struct ceph_mds_client *r_mdsc; |
2f2dc053 SW |
194 | |
195 | int r_op; /* mds op code */ | |
2f2dc053 SW |
196 | |
197 | /* operation on what? */ | |
198 | struct inode *r_inode; /* arg1 */ | |
199 | struct dentry *r_dentry; /* arg1 */ | |
200 | struct dentry *r_old_dentry; /* arg2: rename from or link from */ | |
41b02e1f | 201 | struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ |
2f2dc053 SW |
202 | char *r_path1, *r_path2; |
203 | struct ceph_vino r_ino1, r_ino2; | |
204 | ||
205 | struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */ | |
206 | struct inode *r_target_inode; /* resulting inode */ | |
207 | ||
b4556396 SW |
208 | struct mutex r_fill_mutex; |
209 | ||
2f2dc053 SW |
210 | union ceph_mds_request_args r_args; |
211 | int r_fmode; /* file mode, if expecting cap */ | |
ff3d0046 EB |
212 | kuid_t r_uid; |
213 | kgid_t r_gid; | |
b8e69066 | 214 | struct timespec r_stamp; |
2f2dc053 SW |
215 | |
216 | /* for choosing which mds to send this request to */ | |
217 | int r_direct_mode; | |
218 | u32 r_direct_hash; /* choose dir frag based on this dentry hash */ | |
219 | bool r_direct_is_hash; /* true if r_direct_hash is valid */ | |
220 | ||
221 | /* data payload is used for xattr ops */ | |
25e6bae3 | 222 | struct ceph_pagelist *r_pagelist; |
2f2dc053 SW |
223 | |
224 | /* what caps shall we drop? */ | |
225 | int r_inode_drop, r_inode_unless; | |
226 | int r_dentry_drop, r_dentry_unless; | |
227 | int r_old_dentry_drop, r_old_dentry_unless; | |
228 | struct inode *r_old_inode; | |
229 | int r_old_inode_drop, r_old_inode_unless; | |
230 | ||
231 | struct ceph_msg *r_request; /* original request */ | |
e979cf50 | 232 | int r_request_release_offset; |
2f2dc053 SW |
233 | struct ceph_msg *r_reply; |
234 | struct ceph_mds_reply_info_parsed r_reply_info; | |
01deead0 | 235 | struct page *r_locked_page; |
2f2dc053 | 236 | int r_err; |
5b1daecd | 237 | bool r_aborted; |
2f2dc053 | 238 | |
a319bf56 | 239 | unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ |
2f2dc053 SW |
240 | unsigned long r_started; /* start time to measure timeout against */ |
241 | unsigned long r_request_started; /* start time for mds request only, | |
242 | used to measure lease durations */ | |
243 | ||
244 | /* link unsafe requests to parent directory, for fsync */ | |
245 | struct inode *r_unsafe_dir; | |
246 | struct list_head r_unsafe_dir_item; | |
247 | ||
68cd5b4b YZ |
248 | /* unsafe requests that modify the target inode */ |
249 | struct list_head r_unsafe_target_item; | |
250 | ||
2f2dc053 SW |
251 | struct ceph_mds_session *r_session; |
252 | ||
253 | int r_attempts; /* resend attempts */ | |
254 | int r_num_fwd; /* number of forward attempts */ | |
2f2dc053 | 255 | int r_resend_mds; /* mds to resend to next, if any*/ |
e55b71f8 | 256 | u32 r_sent_on_mseq; /* cap mseq request was sent at*/ |
2f2dc053 | 257 | |
153c8e6b | 258 | struct kref r_kref; |
2f2dc053 SW |
259 | struct list_head r_wait; |
260 | struct completion r_completion; | |
261 | struct completion r_safe_completion; | |
262 | ceph_mds_request_callback_t r_callback; | |
9280be24 | 263 | ceph_mds_request_wait_callback_t r_wait_for_completion; |
2f2dc053 | 264 | struct list_head r_unsafe_item; /* per-session unsafe list item */ |
e1518c7c | 265 | bool r_got_unsafe, r_got_safe, r_got_result; |
2f2dc053 SW |
266 | |
267 | bool r_did_prepopulate; | |
fdd4e158 YZ |
268 | long long r_dir_release_cnt; |
269 | long long r_dir_ordered_cnt; | |
270 | int r_readdir_cache_idx; | |
2f2dc053 SW |
271 | u32 r_readdir_offset; |
272 | ||
273 | struct ceph_cap_reservation r_caps_reservation; | |
274 | int r_num_caps; | |
275 | }; | |
276 | ||
10183a69 YZ |
277 | struct ceph_pool_perm { |
278 | struct rb_node node; | |
10183a69 | 279 | int perm; |
7627151e | 280 | s64 pool; |
779fe0fb YZ |
281 | size_t pool_ns_len; |
282 | char pool_ns[]; | |
10183a69 YZ |
283 | }; |
284 | ||
2f2dc053 SW |
285 | /* |
286 | * mds client state | |
287 | */ | |
288 | struct ceph_mds_client { | |
3d14c5d2 | 289 | struct ceph_fs_client *fsc; |
2f2dc053 SW |
290 | struct mutex mutex; /* all nested structures */ |
291 | ||
292 | struct ceph_mdsmap *mdsmap; | |
f3c60c59 SW |
293 | struct completion safe_umount_waiters; |
294 | wait_queue_head_t session_close_wq; | |
2f2dc053 SW |
295 | struct list_head waiting_for_map; |
296 | ||
297 | struct ceph_mds_session **sessions; /* NULL for mds if no session */ | |
86d8f67b | 298 | atomic_t num_sessions; |
2f2dc053 SW |
299 | int max_sessions; /* len of s_mds_sessions */ |
300 | int stopping; /* true if shutting down */ | |
301 | ||
302 | /* | |
303 | * snap_rwsem will cover cap linkage into snaprealms, and | |
304 | * realm snap contexts. (later, we can do per-realm snap | |
305 | * contexts locks..) the empty list contains realms with no | |
306 | * references (implying they contain no inodes with caps) that | |
307 | * should be destroyed. | |
308 | */ | |
affbc19a | 309 | u64 last_snap_seq; |
2f2dc053 | 310 | struct rw_semaphore snap_rwsem; |
a105f00c | 311 | struct rb_root snap_realms; |
2f2dc053 SW |
312 | struct list_head snap_empty; |
313 | spinlock_t snap_empty_lock; /* protect snap_empty */ | |
314 | ||
315 | u64 last_tid; /* most recent mds request */ | |
e8a7b8b1 YZ |
316 | u64 oldest_tid; /* oldest incomplete mds request, |
317 | excluding setfilelock requests */ | |
44ca18f2 | 318 | struct rb_root request_tree; /* pending mds requests */ |
2f2dc053 SW |
319 | struct delayed_work delayed_work; /* delayed work */ |
320 | unsigned long last_renew_caps; /* last time we renewed our caps */ | |
321 | struct list_head cap_delay_list; /* caps with delayed release */ | |
322 | spinlock_t cap_delay_lock; /* protects cap_delay_list */ | |
323 | struct list_head snap_flush_list; /* cap_snaps ready to flush */ | |
324 | spinlock_t snap_flush_lock; | |
325 | ||
553adfd9 | 326 | u64 last_cap_flush_tid; |
8310b089 | 327 | struct rb_root cap_flush_tree; |
2f2dc053 | 328 | struct list_head cap_dirty; /* inodes with dirty caps */ |
db354052 | 329 | struct list_head cap_dirty_migrating; /* ...that are migration... */ |
2f2dc053 SW |
330 | int num_cap_flushing; /* # caps we are flushing */ |
331 | spinlock_t cap_dirty_lock; /* protects above items */ | |
332 | wait_queue_head_t cap_flushing_wq; | |
333 | ||
37151668 YS |
334 | /* |
335 | * Cap reservations | |
336 | * | |
337 | * Maintain a global pool of preallocated struct ceph_caps, referenced | |
338 | * by struct ceph_caps_reservations. This ensures that we preallocate | |
339 | * memory needed to successfully process an MDS response. (If an MDS | |
340 | * sends us cap information and we fail to process it, we will have | |
341 | * problems due to the client and MDS being out of sync.) | |
342 | * | |
343 | * Reservations are 'owned' by a ceph_cap_reservation context. | |
344 | */ | |
345 | spinlock_t caps_list_lock; | |
346 | struct list_head caps_list; /* unused (reserved or | |
347 | unreserved) */ | |
348 | int caps_total_count; /* total caps allocated */ | |
349 | int caps_use_count; /* in use */ | |
350 | int caps_reserve_count; /* unused, reserved */ | |
351 | int caps_avail_count; /* unused, unreserved */ | |
352 | int caps_min_count; /* keep at least this many | |
353 | (unreserved) */ | |
2f2dc053 SW |
354 | spinlock_t dentry_lru_lock; |
355 | struct list_head dentry_lru; | |
356 | int num_dentry; | |
10183a69 YZ |
357 | |
358 | struct rw_semaphore pool_perm_rwsem; | |
359 | struct rb_root pool_perm_tree; | |
2f2dc053 SW |
360 | }; |
361 | ||
362 | extern const char *ceph_mds_op_name(int op); | |
363 | ||
364 | extern struct ceph_mds_session * | |
365 | __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); | |
366 | ||
367 | static inline struct ceph_mds_session * | |
368 | ceph_get_mds_session(struct ceph_mds_session *s) | |
369 | { | |
370 | atomic_inc(&s->s_ref); | |
371 | return s; | |
372 | } | |
373 | ||
a687ecaf JS |
374 | extern const char *ceph_session_state_name(int s); |
375 | ||
2f2dc053 SW |
376 | extern void ceph_put_mds_session(struct ceph_mds_session *s); |
377 | ||
378 | extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, | |
379 | struct ceph_msg *msg, int mds); | |
380 | ||
3d14c5d2 | 381 | extern int ceph_mdsc_init(struct ceph_fs_client *fsc); |
2f2dc053 | 382 | extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); |
48fec5d0 | 383 | extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); |
3d14c5d2 | 384 | extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); |
2f2dc053 SW |
385 | |
386 | extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); | |
387 | ||
388 | extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, | |
389 | struct inode *inode, | |
2f90b852 | 390 | struct dentry *dn); |
2f2dc053 | 391 | |
167c9e35 | 392 | extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); |
54008399 YZ |
393 | extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
394 | struct inode *dir); | |
2f2dc053 SW |
395 | extern struct ceph_mds_request * |
396 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); | |
397 | extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
398 | struct ceph_mds_request *req); | |
399 | extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
400 | struct inode *dir, | |
401 | struct ceph_mds_request *req); | |
402 | static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) | |
403 | { | |
153c8e6b SW |
404 | kref_get(&req->r_kref); |
405 | } | |
406 | extern void ceph_mdsc_release_request(struct kref *kref); | |
407 | static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) | |
408 | { | |
409 | kref_put(&req->r_kref, ceph_mdsc_release_request); | |
2f2dc053 | 410 | } |
2f2dc053 | 411 | |
3d7ded4d SW |
412 | extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
413 | struct ceph_mds_session *session); | |
414 | ||
2f2dc053 SW |
415 | extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); |
416 | ||
417 | extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
418 | int stop_on_nosnap); | |
419 | ||
420 | extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); | |
421 | extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
422 | struct inode *inode, | |
423 | struct dentry *dentry, char action, | |
424 | u32 seq); | |
425 | ||
426 | extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, | |
427 | struct ceph_msg *msg); | |
428 | ||
5d72d13c YZ |
429 | extern struct ceph_mds_session * |
430 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); | |
154f42c2 SW |
431 | extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
432 | struct ceph_mds_session *session); | |
433 | ||
2f2dc053 | 434 | #endif |