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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> | |
8 | #include <linux/radix-tree.h> | |
44ca18f2 | 9 | #include <linux/rbtree.h> |
2f2dc053 SW |
10 | #include <linux/spinlock.h> |
11 | ||
12 | #include "types.h" | |
13 | #include "messenger.h" | |
14 | #include "mdsmap.h" | |
15 | ||
16 | /* | |
17 | * Some lock dependencies: | |
18 | * | |
19 | * session->s_mutex | |
20 | * mdsc->mutex | |
21 | * | |
22 | * mdsc->snap_rwsem | |
23 | * | |
24 | * inode->i_lock | |
25 | * mdsc->snap_flush_lock | |
26 | * mdsc->cap_delay_lock | |
27 | * | |
28 | */ | |
29 | ||
30 | struct ceph_client; | |
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; | |
39 | u32 symlink_len; | |
40 | char *symlink; | |
41 | u32 xattr_len; | |
42 | char *xattr_data; | |
43 | }; | |
44 | ||
45 | /* | |
46 | * parsed info about an mds reply, including information about the | |
47 | * target inode and/or its parent directory and dentry, and directory | |
48 | * contents (for readdir results). | |
49 | */ | |
50 | struct ceph_mds_reply_info_parsed { | |
51 | struct ceph_mds_reply_head *head; | |
52 | ||
53 | struct ceph_mds_reply_info_in diri, targeti; | |
54 | struct ceph_mds_reply_dirfrag *dirfrag; | |
55 | char *dname; | |
56 | u32 dname_len; | |
57 | struct ceph_mds_reply_lease *dlease; | |
58 | ||
59 | struct ceph_mds_reply_dirfrag *dir_dir; | |
60 | int dir_nr; | |
61 | char **dir_dname; | |
62 | u32 *dir_dname_len; | |
63 | struct ceph_mds_reply_lease **dir_dlease; | |
64 | struct ceph_mds_reply_info_in *dir_in; | |
65 | u8 dir_complete, dir_end; | |
66 | ||
67 | /* encoded blob describing snapshot contexts for certain | |
68 | operations (e.g., open) */ | |
69 | void *snapblob; | |
70 | int snapblob_len; | |
71 | }; | |
72 | ||
73 | ||
74 | /* | |
75 | * cap releases are batched and sent to the MDS en masse. | |
76 | */ | |
77 | #define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \ | |
78 | sizeof(struct ceph_mds_cap_release)) / \ | |
79 | sizeof(struct ceph_mds_cap_item)) | |
80 | ||
81 | ||
82 | /* | |
83 | * state associated with each MDS<->client session | |
84 | */ | |
85 | enum { | |
86 | CEPH_MDS_SESSION_NEW = 1, | |
87 | CEPH_MDS_SESSION_OPENING = 2, | |
88 | CEPH_MDS_SESSION_OPEN = 3, | |
89 | CEPH_MDS_SESSION_HUNG = 4, | |
90 | CEPH_MDS_SESSION_CLOSING = 5, | |
91 | CEPH_MDS_SESSION_RESTARTING = 6, | |
92 | CEPH_MDS_SESSION_RECONNECTING = 7, | |
93 | }; | |
94 | ||
95 | struct ceph_mds_session { | |
96 | struct ceph_mds_client *s_mdsc; | |
97 | int s_mds; | |
98 | int s_state; | |
99 | unsigned long s_ttl; /* time until mds kills us */ | |
100 | u64 s_seq; /* incoming msg seq # */ | |
101 | struct mutex s_mutex; /* serialize session messages */ | |
102 | ||
103 | struct ceph_connection s_con; | |
104 | ||
4e7a5dcd SW |
105 | struct ceph_authorizer *s_authorizer; |
106 | void *s_authorizer_buf, *s_authorizer_reply_buf; | |
107 | size_t s_authorizer_buf_len, s_authorizer_reply_buf_len; | |
108 | ||
2f2dc053 SW |
109 | /* protected by s_cap_lock */ |
110 | spinlock_t s_cap_lock; | |
111 | u32 s_cap_gen; /* inc each time we get mds stale msg */ | |
112 | unsigned long s_cap_ttl; /* when session caps expire */ | |
113 | struct list_head s_caps; /* all caps issued by this session */ | |
114 | int s_nr_caps, s_trim_caps; | |
115 | int s_num_cap_releases; | |
116 | struct list_head s_cap_releases; /* waiting cap_release messages */ | |
117 | struct list_head s_cap_releases_done; /* ready to send */ | |
5dacf091 | 118 | bool s_iterating_caps; |
2f2dc053 SW |
119 | |
120 | /* protected by mutex */ | |
121 | struct list_head s_cap_flushing; /* inodes w/ flushing caps */ | |
122 | struct list_head s_cap_snaps_flushing; | |
123 | unsigned long s_renew_requested; /* last time we sent a renew req */ | |
124 | u64 s_renew_seq; | |
125 | ||
126 | atomic_t s_ref; | |
127 | struct list_head s_waiting; /* waiting requests */ | |
128 | struct list_head s_unsafe; /* unsafe requests */ | |
129 | }; | |
130 | ||
131 | /* | |
132 | * modes of choosing which MDS to send a request to | |
133 | */ | |
134 | enum { | |
135 | USE_ANY_MDS, | |
136 | USE_RANDOM_MDS, | |
137 | USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ | |
138 | }; | |
139 | ||
140 | struct ceph_mds_request; | |
141 | struct ceph_mds_client; | |
142 | ||
143 | /* | |
144 | * request completion callback | |
145 | */ | |
146 | typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, | |
147 | struct ceph_mds_request *req); | |
148 | ||
149 | /* | |
150 | * an in-flight mds request | |
151 | */ | |
152 | struct ceph_mds_request { | |
153 | u64 r_tid; /* transaction id */ | |
44ca18f2 | 154 | struct rb_node r_node; |
2f2dc053 SW |
155 | |
156 | int r_op; /* mds op code */ | |
157 | int r_mds; | |
158 | ||
159 | /* operation on what? */ | |
160 | struct inode *r_inode; /* arg1 */ | |
161 | struct dentry *r_dentry; /* arg1 */ | |
162 | struct dentry *r_old_dentry; /* arg2: rename from or link from */ | |
163 | char *r_path1, *r_path2; | |
164 | struct ceph_vino r_ino1, r_ino2; | |
165 | ||
166 | struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */ | |
167 | struct inode *r_target_inode; /* resulting inode */ | |
168 | ||
169 | union ceph_mds_request_args r_args; | |
170 | int r_fmode; /* file mode, if expecting cap */ | |
171 | ||
172 | /* for choosing which mds to send this request to */ | |
173 | int r_direct_mode; | |
174 | u32 r_direct_hash; /* choose dir frag based on this dentry hash */ | |
175 | bool r_direct_is_hash; /* true if r_direct_hash is valid */ | |
176 | ||
177 | /* data payload is used for xattr ops */ | |
178 | struct page **r_pages; | |
179 | int r_num_pages; | |
180 | int r_data_len; | |
181 | ||
182 | /* what caps shall we drop? */ | |
183 | int r_inode_drop, r_inode_unless; | |
184 | int r_dentry_drop, r_dentry_unless; | |
185 | int r_old_dentry_drop, r_old_dentry_unless; | |
186 | struct inode *r_old_inode; | |
187 | int r_old_inode_drop, r_old_inode_unless; | |
188 | ||
189 | struct ceph_msg *r_request; /* original request */ | |
190 | struct ceph_msg *r_reply; | |
191 | struct ceph_mds_reply_info_parsed r_reply_info; | |
192 | int r_err; | |
5b1daecd | 193 | bool r_aborted; |
2f2dc053 SW |
194 | |
195 | unsigned long r_timeout; /* optional. jiffies */ | |
196 | unsigned long r_started; /* start time to measure timeout against */ | |
197 | unsigned long r_request_started; /* start time for mds request only, | |
198 | used to measure lease durations */ | |
199 | ||
200 | /* link unsafe requests to parent directory, for fsync */ | |
201 | struct inode *r_unsafe_dir; | |
202 | struct list_head r_unsafe_dir_item; | |
203 | ||
204 | struct ceph_mds_session *r_session; | |
205 | ||
206 | int r_attempts; /* resend attempts */ | |
207 | int r_num_fwd; /* number of forward attempts */ | |
208 | int r_num_stale; | |
209 | int r_resend_mds; /* mds to resend to next, if any*/ | |
210 | ||
153c8e6b | 211 | struct kref r_kref; |
2f2dc053 SW |
212 | struct list_head r_wait; |
213 | struct completion r_completion; | |
214 | struct completion r_safe_completion; | |
215 | ceph_mds_request_callback_t r_callback; | |
216 | struct list_head r_unsafe_item; /* per-session unsafe list item */ | |
217 | bool r_got_unsafe, r_got_safe; | |
218 | ||
219 | bool r_did_prepopulate; | |
220 | u32 r_readdir_offset; | |
221 | ||
222 | struct ceph_cap_reservation r_caps_reservation; | |
223 | int r_num_caps; | |
224 | }; | |
225 | ||
226 | /* | |
227 | * mds client state | |
228 | */ | |
229 | struct ceph_mds_client { | |
230 | struct ceph_client *client; | |
231 | struct mutex mutex; /* all nested structures */ | |
232 | ||
233 | struct ceph_mdsmap *mdsmap; | |
234 | struct completion safe_umount_waiters, session_close_waiters; | |
235 | struct list_head waiting_for_map; | |
236 | ||
237 | struct ceph_mds_session **sessions; /* NULL for mds if no session */ | |
238 | int max_sessions; /* len of s_mds_sessions */ | |
239 | int stopping; /* true if shutting down */ | |
240 | ||
241 | /* | |
242 | * snap_rwsem will cover cap linkage into snaprealms, and | |
243 | * realm snap contexts. (later, we can do per-realm snap | |
244 | * contexts locks..) the empty list contains realms with no | |
245 | * references (implying they contain no inodes with caps) that | |
246 | * should be destroyed. | |
247 | */ | |
248 | struct rw_semaphore snap_rwsem; | |
249 | struct radix_tree_root snap_realms; | |
250 | struct list_head snap_empty; | |
251 | spinlock_t snap_empty_lock; /* protect snap_empty */ | |
252 | ||
253 | u64 last_tid; /* most recent mds request */ | |
44ca18f2 | 254 | struct rb_root request_tree; /* pending mds requests */ |
2f2dc053 SW |
255 | struct delayed_work delayed_work; /* delayed work */ |
256 | unsigned long last_renew_caps; /* last time we renewed our caps */ | |
257 | struct list_head cap_delay_list; /* caps with delayed release */ | |
258 | spinlock_t cap_delay_lock; /* protects cap_delay_list */ | |
259 | struct list_head snap_flush_list; /* cap_snaps ready to flush */ | |
260 | spinlock_t snap_flush_lock; | |
261 | ||
262 | u64 cap_flush_seq; | |
263 | struct list_head cap_dirty; /* inodes with dirty caps */ | |
264 | int num_cap_flushing; /* # caps we are flushing */ | |
265 | spinlock_t cap_dirty_lock; /* protects above items */ | |
266 | wait_queue_head_t cap_flushing_wq; | |
267 | ||
039934b8 | 268 | #ifdef CONFIG_DEBUG_FS |
2f2dc053 | 269 | struct dentry *debugfs_file; |
039934b8 | 270 | #endif |
2f2dc053 SW |
271 | |
272 | spinlock_t dentry_lru_lock; | |
273 | struct list_head dentry_lru; | |
274 | int num_dentry; | |
275 | }; | |
276 | ||
277 | extern const char *ceph_mds_op_name(int op); | |
278 | ||
279 | extern struct ceph_mds_session * | |
280 | __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); | |
281 | ||
282 | static inline struct ceph_mds_session * | |
283 | ceph_get_mds_session(struct ceph_mds_session *s) | |
284 | { | |
285 | atomic_inc(&s->s_ref); | |
286 | return s; | |
287 | } | |
288 | ||
289 | extern void ceph_put_mds_session(struct ceph_mds_session *s); | |
290 | ||
291 | extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, | |
292 | struct ceph_msg *msg, int mds); | |
293 | ||
5f44f142 | 294 | extern int ceph_mdsc_init(struct ceph_mds_client *mdsc, |
2f2dc053 SW |
295 | struct ceph_client *client); |
296 | extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); | |
297 | extern void ceph_mdsc_stop(struct ceph_mds_client *mdsc); | |
298 | ||
299 | extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); | |
300 | ||
301 | extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, | |
302 | struct inode *inode, | |
303 | struct dentry *dn, int mask); | |
304 | ||
305 | extern struct ceph_mds_request * | |
306 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); | |
307 | extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
308 | struct ceph_mds_request *req); | |
309 | extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
310 | struct inode *dir, | |
311 | struct ceph_mds_request *req); | |
312 | static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) | |
313 | { | |
153c8e6b SW |
314 | kref_get(&req->r_kref); |
315 | } | |
316 | extern void ceph_mdsc_release_request(struct kref *kref); | |
317 | static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) | |
318 | { | |
319 | kref_put(&req->r_kref, ceph_mdsc_release_request); | |
2f2dc053 | 320 | } |
2f2dc053 SW |
321 | |
322 | extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); | |
323 | ||
324 | extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
325 | int stop_on_nosnap); | |
326 | ||
327 | extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); | |
328 | extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
329 | struct inode *inode, | |
330 | struct dentry *dentry, char action, | |
331 | u32 seq); | |
332 | ||
333 | extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, | |
334 | struct ceph_msg *msg); | |
335 | ||
336 | #endif |