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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 | ||
11 | #include "types.h" | |
12 | #include "messenger.h" | |
13 | #include "mdsmap.h" | |
14 | ||
15 | /* | |
16 | * Some lock dependencies: | |
17 | * | |
18 | * session->s_mutex | |
19 | * mdsc->mutex | |
20 | * | |
21 | * mdsc->snap_rwsem | |
22 | * | |
23 | * inode->i_lock | |
24 | * mdsc->snap_flush_lock | |
25 | * mdsc->cap_delay_lock | |
26 | * | |
27 | */ | |
28 | ||
29 | struct ceph_client; | |
30 | struct ceph_cap; | |
31 | ||
32 | /* | |
33 | * parsed info about a single inode. pointers are into the encoded | |
34 | * on-wire structures within the mds reply message payload. | |
35 | */ | |
36 | struct ceph_mds_reply_info_in { | |
37 | struct ceph_mds_reply_inode *in; | |
38 | u32 symlink_len; | |
39 | char *symlink; | |
40 | u32 xattr_len; | |
41 | char *xattr_data; | |
42 | }; | |
43 | ||
44 | /* | |
45 | * parsed info about an mds reply, including information about the | |
46 | * target inode and/or its parent directory and dentry, and directory | |
47 | * contents (for readdir results). | |
48 | */ | |
49 | struct ceph_mds_reply_info_parsed { | |
50 | struct ceph_mds_reply_head *head; | |
51 | ||
52 | struct ceph_mds_reply_info_in diri, targeti; | |
53 | struct ceph_mds_reply_dirfrag *dirfrag; | |
54 | char *dname; | |
55 | u32 dname_len; | |
56 | struct ceph_mds_reply_lease *dlease; | |
57 | ||
58 | struct ceph_mds_reply_dirfrag *dir_dir; | |
59 | int dir_nr; | |
60 | char **dir_dname; | |
61 | u32 *dir_dname_len; | |
62 | struct ceph_mds_reply_lease **dir_dlease; | |
63 | struct ceph_mds_reply_info_in *dir_in; | |
64 | u8 dir_complete, dir_end; | |
65 | ||
66 | /* encoded blob describing snapshot contexts for certain | |
67 | operations (e.g., open) */ | |
68 | void *snapblob; | |
69 | int snapblob_len; | |
70 | }; | |
71 | ||
72 | ||
73 | /* | |
74 | * cap releases are batched and sent to the MDS en masse. | |
75 | */ | |
76 | #define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \ | |
77 | sizeof(struct ceph_mds_cap_release)) / \ | |
78 | sizeof(struct ceph_mds_cap_item)) | |
79 | ||
80 | ||
81 | /* | |
82 | * state associated with each MDS<->client session | |
83 | */ | |
84 | enum { | |
85 | CEPH_MDS_SESSION_NEW = 1, | |
86 | CEPH_MDS_SESSION_OPENING = 2, | |
87 | CEPH_MDS_SESSION_OPEN = 3, | |
88 | CEPH_MDS_SESSION_HUNG = 4, | |
89 | CEPH_MDS_SESSION_CLOSING = 5, | |
90 | CEPH_MDS_SESSION_RESTARTING = 6, | |
91 | CEPH_MDS_SESSION_RECONNECTING = 7, | |
92 | }; | |
93 | ||
94 | struct ceph_mds_session { | |
95 | struct ceph_mds_client *s_mdsc; | |
96 | int s_mds; | |
97 | int s_state; | |
98 | unsigned long s_ttl; /* time until mds kills us */ | |
99 | u64 s_seq; /* incoming msg seq # */ | |
100 | struct mutex s_mutex; /* serialize session messages */ | |
101 | ||
102 | struct ceph_connection s_con; | |
103 | ||
4e7a5dcd SW |
104 | struct ceph_authorizer *s_authorizer; |
105 | void *s_authorizer_buf, *s_authorizer_reply_buf; | |
106 | size_t s_authorizer_buf_len, s_authorizer_reply_buf_len; | |
107 | ||
2f2dc053 SW |
108 | /* protected by s_cap_lock */ |
109 | spinlock_t s_cap_lock; | |
110 | u32 s_cap_gen; /* inc each time we get mds stale msg */ | |
111 | unsigned long s_cap_ttl; /* when session caps expire */ | |
112 | struct list_head s_caps; /* all caps issued by this session */ | |
113 | int s_nr_caps, s_trim_caps; | |
114 | int s_num_cap_releases; | |
115 | struct list_head s_cap_releases; /* waiting cap_release messages */ | |
116 | struct list_head s_cap_releases_done; /* ready to send */ | |
7c1332b8 | 117 | struct ceph_cap *s_cap_iterator; |
2f2dc053 SW |
118 | |
119 | /* protected by mutex */ | |
120 | struct list_head s_cap_flushing; /* inodes w/ flushing caps */ | |
121 | struct list_head s_cap_snaps_flushing; | |
122 | unsigned long s_renew_requested; /* last time we sent a renew req */ | |
123 | u64 s_renew_seq; | |
124 | ||
125 | atomic_t s_ref; | |
126 | struct list_head s_waiting; /* waiting requests */ | |
127 | struct list_head s_unsafe; /* unsafe requests */ | |
128 | }; | |
129 | ||
130 | /* | |
131 | * modes of choosing which MDS to send a request to | |
132 | */ | |
133 | enum { | |
134 | USE_ANY_MDS, | |
135 | USE_RANDOM_MDS, | |
136 | USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ | |
137 | }; | |
138 | ||
139 | struct ceph_mds_request; | |
140 | struct ceph_mds_client; | |
141 | ||
142 | /* | |
143 | * request completion callback | |
144 | */ | |
145 | typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, | |
146 | struct ceph_mds_request *req); | |
147 | ||
148 | /* | |
149 | * an in-flight mds request | |
150 | */ | |
151 | struct ceph_mds_request { | |
152 | u64 r_tid; /* transaction id */ | |
44ca18f2 | 153 | struct rb_node r_node; |
2f2dc053 SW |
154 | |
155 | int r_op; /* mds op code */ | |
156 | int r_mds; | |
157 | ||
158 | /* operation on what? */ | |
159 | struct inode *r_inode; /* arg1 */ | |
160 | struct dentry *r_dentry; /* arg1 */ | |
161 | struct dentry *r_old_dentry; /* arg2: rename from or link from */ | |
162 | char *r_path1, *r_path2; | |
163 | struct ceph_vino r_ino1, r_ino2; | |
164 | ||
165 | struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */ | |
166 | struct inode *r_target_inode; /* resulting inode */ | |
167 | ||
b4556396 SW |
168 | struct mutex r_fill_mutex; |
169 | ||
2f2dc053 SW |
170 | union ceph_mds_request_args r_args; |
171 | int r_fmode; /* file mode, if expecting cap */ | |
172 | ||
173 | /* for choosing which mds to send this request to */ | |
174 | int r_direct_mode; | |
175 | u32 r_direct_hash; /* choose dir frag based on this dentry hash */ | |
176 | bool r_direct_is_hash; /* true if r_direct_hash is valid */ | |
177 | ||
178 | /* data payload is used for xattr ops */ | |
179 | struct page **r_pages; | |
180 | int r_num_pages; | |
181 | int r_data_len; | |
182 | ||
183 | /* what caps shall we drop? */ | |
184 | int r_inode_drop, r_inode_unless; | |
185 | int r_dentry_drop, r_dentry_unless; | |
186 | int r_old_dentry_drop, r_old_dentry_unless; | |
187 | struct inode *r_old_inode; | |
188 | int r_old_inode_drop, r_old_inode_unless; | |
189 | ||
190 | struct ceph_msg *r_request; /* original request */ | |
191 | struct ceph_msg *r_reply; | |
192 | struct ceph_mds_reply_info_parsed r_reply_info; | |
193 | int r_err; | |
5b1daecd | 194 | bool r_aborted; |
2f2dc053 SW |
195 | |
196 | unsigned long r_timeout; /* optional. jiffies */ | |
197 | unsigned long r_started; /* start time to measure timeout against */ | |
198 | unsigned long r_request_started; /* start time for mds request only, | |
199 | used to measure lease durations */ | |
200 | ||
201 | /* link unsafe requests to parent directory, for fsync */ | |
202 | struct inode *r_unsafe_dir; | |
203 | struct list_head r_unsafe_dir_item; | |
204 | ||
205 | struct ceph_mds_session *r_session; | |
206 | ||
207 | int r_attempts; /* resend attempts */ | |
208 | int r_num_fwd; /* number of forward attempts */ | |
209 | int r_num_stale; | |
210 | int r_resend_mds; /* mds to resend to next, if any*/ | |
211 | ||
153c8e6b | 212 | struct kref r_kref; |
2f2dc053 SW |
213 | struct list_head r_wait; |
214 | struct completion r_completion; | |
215 | struct completion r_safe_completion; | |
216 | ceph_mds_request_callback_t r_callback; | |
217 | struct list_head r_unsafe_item; /* per-session unsafe list item */ | |
e1518c7c | 218 | bool r_got_unsafe, r_got_safe, r_got_result; |
2f2dc053 SW |
219 | |
220 | bool r_did_prepopulate; | |
221 | u32 r_readdir_offset; | |
222 | ||
223 | struct ceph_cap_reservation r_caps_reservation; | |
224 | int r_num_caps; | |
225 | }; | |
226 | ||
227 | /* | |
228 | * mds client state | |
229 | */ | |
230 | struct ceph_mds_client { | |
231 | struct ceph_client *client; | |
232 | struct mutex mutex; /* all nested structures */ | |
233 | ||
234 | struct ceph_mdsmap *mdsmap; | |
235 | struct completion safe_umount_waiters, session_close_waiters; | |
236 | struct list_head waiting_for_map; | |
237 | ||
238 | struct ceph_mds_session **sessions; /* NULL for mds if no session */ | |
239 | int max_sessions; /* len of s_mds_sessions */ | |
240 | int stopping; /* true if shutting down */ | |
241 | ||
242 | /* | |
243 | * snap_rwsem will cover cap linkage into snaprealms, and | |
244 | * realm snap contexts. (later, we can do per-realm snap | |
245 | * contexts locks..) the empty list contains realms with no | |
246 | * references (implying they contain no inodes with caps) that | |
247 | * should be destroyed. | |
248 | */ | |
249 | struct rw_semaphore snap_rwsem; | |
a105f00c | 250 | struct rb_root snap_realms; |
2f2dc053 SW |
251 | struct list_head snap_empty; |
252 | spinlock_t snap_empty_lock; /* protect snap_empty */ | |
253 | ||
254 | u64 last_tid; /* most recent mds request */ | |
44ca18f2 | 255 | struct rb_root request_tree; /* pending mds requests */ |
2f2dc053 SW |
256 | struct delayed_work delayed_work; /* delayed work */ |
257 | unsigned long last_renew_caps; /* last time we renewed our caps */ | |
258 | struct list_head cap_delay_list; /* caps with delayed release */ | |
259 | spinlock_t cap_delay_lock; /* protects cap_delay_list */ | |
260 | struct list_head snap_flush_list; /* cap_snaps ready to flush */ | |
261 | spinlock_t snap_flush_lock; | |
262 | ||
263 | u64 cap_flush_seq; | |
264 | struct list_head cap_dirty; /* inodes with dirty caps */ | |
265 | int num_cap_flushing; /* # caps we are flushing */ | |
266 | spinlock_t cap_dirty_lock; /* protects above items */ | |
267 | wait_queue_head_t cap_flushing_wq; | |
268 | ||
039934b8 | 269 | #ifdef CONFIG_DEBUG_FS |
2f2dc053 | 270 | struct dentry *debugfs_file; |
039934b8 | 271 | #endif |
2f2dc053 SW |
272 | |
273 | spinlock_t dentry_lru_lock; | |
274 | struct list_head dentry_lru; | |
275 | int num_dentry; | |
276 | }; | |
277 | ||
278 | extern const char *ceph_mds_op_name(int op); | |
279 | ||
280 | extern struct ceph_mds_session * | |
281 | __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); | |
282 | ||
283 | static inline struct ceph_mds_session * | |
284 | ceph_get_mds_session(struct ceph_mds_session *s) | |
285 | { | |
286 | atomic_inc(&s->s_ref); | |
287 | return s; | |
288 | } | |
289 | ||
290 | extern void ceph_put_mds_session(struct ceph_mds_session *s); | |
291 | ||
292 | extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, | |
293 | struct ceph_msg *msg, int mds); | |
294 | ||
5f44f142 | 295 | extern int ceph_mdsc_init(struct ceph_mds_client *mdsc, |
2f2dc053 SW |
296 | struct ceph_client *client); |
297 | extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); | |
298 | extern void ceph_mdsc_stop(struct ceph_mds_client *mdsc); | |
299 | ||
300 | extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); | |
301 | ||
302 | extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, | |
303 | struct inode *inode, | |
304 | struct dentry *dn, int mask); | |
305 | ||
167c9e35 SW |
306 | extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); |
307 | ||
2f2dc053 SW |
308 | extern struct ceph_mds_request * |
309 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); | |
310 | extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
311 | struct ceph_mds_request *req); | |
312 | extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
313 | struct inode *dir, | |
314 | struct ceph_mds_request *req); | |
315 | static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) | |
316 | { | |
153c8e6b SW |
317 | kref_get(&req->r_kref); |
318 | } | |
319 | extern void ceph_mdsc_release_request(struct kref *kref); | |
320 | static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) | |
321 | { | |
322 | kref_put(&req->r_kref, ceph_mdsc_release_request); | |
2f2dc053 | 323 | } |
2f2dc053 | 324 | |
3d7ded4d SW |
325 | extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
326 | struct ceph_mds_session *session); | |
327 | ||
2f2dc053 SW |
328 | extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); |
329 | ||
330 | extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
331 | int stop_on_nosnap); | |
332 | ||
333 | extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); | |
334 | extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
335 | struct inode *inode, | |
336 | struct dentry *dentry, char action, | |
337 | u32 seq); | |
338 | ||
339 | extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, | |
340 | struct ceph_msg *msg); | |
341 | ||
342 | #endif |