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Sage Weil2f2dc052009-10-06 11:31:09 -07001#ifndef _FS_CEPH_MDS_CLIENT_H
2#define _FS_CEPH_MDS_CLIENT_H
3
4#include <linux/completion.h>
Sage Weil153c8e62009-12-07 12:31:09 -08005#include <linux/kref.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07006#include <linux/list.h>
7#include <linux/mutex.h>
Sage Weil44ca18f2010-02-15 12:08:46 -08008#include <linux/rbtree.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07009#include <linux/spinlock.h>
10
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070011#include <linux/ceph/types.h>
12#include <linux/ceph/messenger.h>
13#include <linux/ceph/mdsmap.h>
Sage Weil2f2dc052009-10-06 11:31:09 -070014
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
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070029struct ceph_fs_client;
Sage Weil2f2dc052009-10-06 11:31:09 -070030struct 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 */
36struct ceph_mds_reply_info_in {
37 struct ceph_mds_reply_inode *in;
Sage Weil14303d22010-12-14 17:37:52 -080038 struct ceph_dir_layout dir_layout;
Sage Weil2f2dc052009-10-06 11:31:09 -070039 u32 symlink_len;
40 char *symlink;
41 u32 xattr_len;
42 char *xattr_data;
43};
44
45/*
Herb Shiu25933ab2010-12-01 14:14:38 -080046 * parsed info about an mds reply, including information about
47 * either: 1) the target inode and/or its parent directory and dentry,
48 * and directory contents (for readdir results), or
49 * 2) the file range lock info (for fcntl F_GETLK results).
Sage Weil2f2dc052009-10-06 11:31:09 -070050 */
51struct ceph_mds_reply_info_parsed {
52 struct ceph_mds_reply_head *head;
53
Herb Shiu25933ab2010-12-01 14:14:38 -080054 /* trace */
Sage Weil2f2dc052009-10-06 11:31:09 -070055 struct ceph_mds_reply_info_in diri, targeti;
56 struct ceph_mds_reply_dirfrag *dirfrag;
57 char *dname;
58 u32 dname_len;
59 struct ceph_mds_reply_lease *dlease;
60
Herb Shiu25933ab2010-12-01 14:14:38 -080061 /* extra */
62 union {
63 /* for fcntl F_GETLK results */
64 struct ceph_filelock *filelock_reply;
65
66 /* for readdir results */
67 struct {
68 struct ceph_mds_reply_dirfrag *dir_dir;
69 int dir_nr;
70 char **dir_dname;
71 u32 *dir_dname_len;
72 struct ceph_mds_reply_lease **dir_dlease;
73 struct ceph_mds_reply_info_in *dir_in;
74 u8 dir_complete, dir_end;
75 };
76 };
Sage Weil2f2dc052009-10-06 11:31:09 -070077
78 /* encoded blob describing snapshot contexts for certain
79 operations (e.g., open) */
80 void *snapblob;
81 int snapblob_len;
82};
83
84
85/*
86 * cap releases are batched and sent to the MDS en masse.
87 */
88#define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \
89 sizeof(struct ceph_mds_cap_release)) / \
90 sizeof(struct ceph_mds_cap_item))
91
92
93/*
94 * state associated with each MDS<->client session
95 */
96enum {
97 CEPH_MDS_SESSION_NEW = 1,
98 CEPH_MDS_SESSION_OPENING = 2,
99 CEPH_MDS_SESSION_OPEN = 3,
100 CEPH_MDS_SESSION_HUNG = 4,
101 CEPH_MDS_SESSION_CLOSING = 5,
102 CEPH_MDS_SESSION_RESTARTING = 6,
103 CEPH_MDS_SESSION_RECONNECTING = 7,
104};
105
106struct ceph_mds_session {
107 struct ceph_mds_client *s_mdsc;
108 int s_mds;
109 int s_state;
110 unsigned long s_ttl; /* time until mds kills us */
111 u64 s_seq; /* incoming msg seq # */
112 struct mutex s_mutex; /* serialize session messages */
113
Sage Weil2f2dc052009-10-06 11:31:09 -0700114 struct ceph_connection s_con;
115
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800116 struct ceph_authorizer *s_authorizer;
117 void *s_authorizer_buf, *s_authorizer_reply_buf;
118 size_t s_authorizer_buf_len, s_authorizer_reply_buf_len;
119
Sage Weil2f2dc052009-10-06 11:31:09 -0700120 /* protected by s_cap_lock */
121 spinlock_t s_cap_lock;
122 u32 s_cap_gen; /* inc each time we get mds stale msg */
123 unsigned long s_cap_ttl; /* when session caps expire */
124 struct list_head s_caps; /* all caps issued by this session */
125 int s_nr_caps, s_trim_caps;
126 int s_num_cap_releases;
127 struct list_head s_cap_releases; /* waiting cap_release messages */
128 struct list_head s_cap_releases_done; /* ready to send */
Sage Weil7c1332b2010-02-16 11:39:45 -0800129 struct ceph_cap *s_cap_iterator;
Sage Weil2f2dc052009-10-06 11:31:09 -0700130
131 /* protected by mutex */
132 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
133 struct list_head s_cap_snaps_flushing;
134 unsigned long s_renew_requested; /* last time we sent a renew req */
135 u64 s_renew_seq;
136
137 atomic_t s_ref;
138 struct list_head s_waiting; /* waiting requests */
139 struct list_head s_unsafe; /* unsafe requests */
140};
141
142/*
143 * modes of choosing which MDS to send a request to
144 */
145enum {
146 USE_ANY_MDS,
147 USE_RANDOM_MDS,
148 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
149};
150
151struct ceph_mds_request;
152struct ceph_mds_client;
153
154/*
155 * request completion callback
156 */
157typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
158 struct ceph_mds_request *req);
159
160/*
161 * an in-flight mds request
162 */
163struct ceph_mds_request {
164 u64 r_tid; /* transaction id */
Sage Weil44ca18f2010-02-15 12:08:46 -0800165 struct rb_node r_node;
Yehuda Sadeh37151662010-06-17 16:16:12 -0700166 struct ceph_mds_client *r_mdsc;
Sage Weil2f2dc052009-10-06 11:31:09 -0700167
168 int r_op; /* mds op code */
Sage Weil2f2dc052009-10-06 11:31:09 -0700169
170 /* operation on what? */
171 struct inode *r_inode; /* arg1 */
172 struct dentry *r_dentry; /* arg1 */
173 struct dentry *r_old_dentry; /* arg2: rename from or link from */
Sage Weil41b02e12011-07-26 11:31:14 -0700174 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
Sage Weil2f2dc052009-10-06 11:31:09 -0700175 char *r_path1, *r_path2;
176 struct ceph_vino r_ino1, r_ino2;
177
178 struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
179 struct inode *r_target_inode; /* resulting inode */
180
Sage Weilb4556392010-05-13 12:01:13 -0700181 struct mutex r_fill_mutex;
182
Sage Weil2f2dc052009-10-06 11:31:09 -0700183 union ceph_mds_request_args r_args;
184 int r_fmode; /* file mode, if expecting cap */
Sage Weilcb4276c2010-11-08 07:28:52 -0800185 uid_t r_uid;
186 gid_t r_gid;
Sage Weil2f2dc052009-10-06 11:31:09 -0700187
188 /* for choosing which mds to send this request to */
189 int r_direct_mode;
190 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
191 bool r_direct_is_hash; /* true if r_direct_hash is valid */
192
193 /* data payload is used for xattr ops */
194 struct page **r_pages;
195 int r_num_pages;
196 int r_data_len;
197
198 /* what caps shall we drop? */
199 int r_inode_drop, r_inode_unless;
200 int r_dentry_drop, r_dentry_unless;
201 int r_old_dentry_drop, r_old_dentry_unless;
202 struct inode *r_old_inode;
203 int r_old_inode_drop, r_old_inode_unless;
204
205 struct ceph_msg *r_request; /* original request */
Sage Weile979cf52010-07-15 14:58:39 -0700206 int r_request_release_offset;
Sage Weil2f2dc052009-10-06 11:31:09 -0700207 struct ceph_msg *r_reply;
208 struct ceph_mds_reply_info_parsed r_reply_info;
209 int r_err;
Sage Weil5b1daec2010-01-25 11:33:08 -0800210 bool r_aborted;
Sage Weil2f2dc052009-10-06 11:31:09 -0700211
212 unsigned long r_timeout; /* optional. jiffies */
213 unsigned long r_started; /* start time to measure timeout against */
214 unsigned long r_request_started; /* start time for mds request only,
215 used to measure lease durations */
216
217 /* link unsafe requests to parent directory, for fsync */
218 struct inode *r_unsafe_dir;
219 struct list_head r_unsafe_dir_item;
220
221 struct ceph_mds_session *r_session;
222
223 int r_attempts; /* resend attempts */
224 int r_num_fwd; /* number of forward attempts */
Sage Weil2f2dc052009-10-06 11:31:09 -0700225 int r_resend_mds; /* mds to resend to next, if any*/
Greg Farnume55b71f2010-06-22 15:58:01 -0700226 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
Sage Weil2f2dc052009-10-06 11:31:09 -0700227
Sage Weil153c8e62009-12-07 12:31:09 -0800228 struct kref r_kref;
Sage Weil2f2dc052009-10-06 11:31:09 -0700229 struct list_head r_wait;
230 struct completion r_completion;
231 struct completion r_safe_completion;
232 ceph_mds_request_callback_t r_callback;
233 struct list_head r_unsafe_item; /* per-session unsafe list item */
Sage Weile1518c72010-05-13 11:19:06 -0700234 bool r_got_unsafe, r_got_safe, r_got_result;
Sage Weil2f2dc052009-10-06 11:31:09 -0700235
236 bool r_did_prepopulate;
237 u32 r_readdir_offset;
238
239 struct ceph_cap_reservation r_caps_reservation;
240 int r_num_caps;
241};
242
243/*
244 * mds client state
245 */
246struct ceph_mds_client {
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700247 struct ceph_fs_client *fsc;
Sage Weil2f2dc052009-10-06 11:31:09 -0700248 struct mutex mutex; /* all nested structures */
249
250 struct ceph_mdsmap *mdsmap;
Sage Weilf3c60c52010-08-11 14:51:23 -0700251 struct completion safe_umount_waiters;
252 wait_queue_head_t session_close_wq;
Sage Weil2f2dc052009-10-06 11:31:09 -0700253 struct list_head waiting_for_map;
254
255 struct ceph_mds_session **sessions; /* NULL for mds if no session */
256 int max_sessions; /* len of s_mds_sessions */
257 int stopping; /* true if shutting down */
258
259 /*
260 * snap_rwsem will cover cap linkage into snaprealms, and
261 * realm snap contexts. (later, we can do per-realm snap
262 * contexts locks..) the empty list contains realms with no
263 * references (implying they contain no inodes with caps) that
264 * should be destroyed.
265 */
266 struct rw_semaphore snap_rwsem;
Sage Weila105f002010-02-15 14:37:55 -0800267 struct rb_root snap_realms;
Sage Weil2f2dc052009-10-06 11:31:09 -0700268 struct list_head snap_empty;
269 spinlock_t snap_empty_lock; /* protect snap_empty */
270
271 u64 last_tid; /* most recent mds request */
Sage Weil44ca18f2010-02-15 12:08:46 -0800272 struct rb_root request_tree; /* pending mds requests */
Sage Weil2f2dc052009-10-06 11:31:09 -0700273 struct delayed_work delayed_work; /* delayed work */
274 unsigned long last_renew_caps; /* last time we renewed our caps */
275 struct list_head cap_delay_list; /* caps with delayed release */
276 spinlock_t cap_delay_lock; /* protects cap_delay_list */
277 struct list_head snap_flush_list; /* cap_snaps ready to flush */
278 spinlock_t snap_flush_lock;
279
280 u64 cap_flush_seq;
281 struct list_head cap_dirty; /* inodes with dirty caps */
Sage Weildb354052011-05-24 11:46:31 -0700282 struct list_head cap_dirty_migrating; /* ...that are migration... */
Sage Weil2f2dc052009-10-06 11:31:09 -0700283 int num_cap_flushing; /* # caps we are flushing */
284 spinlock_t cap_dirty_lock; /* protects above items */
285 wait_queue_head_t cap_flushing_wq;
286
Yehuda Sadeh37151662010-06-17 16:16:12 -0700287 /*
288 * Cap reservations
289 *
290 * Maintain a global pool of preallocated struct ceph_caps, referenced
291 * by struct ceph_caps_reservations. This ensures that we preallocate
292 * memory needed to successfully process an MDS response. (If an MDS
293 * sends us cap information and we fail to process it, we will have
294 * problems due to the client and MDS being out of sync.)
295 *
296 * Reservations are 'owned' by a ceph_cap_reservation context.
297 */
298 spinlock_t caps_list_lock;
299 struct list_head caps_list; /* unused (reserved or
300 unreserved) */
301 int caps_total_count; /* total caps allocated */
302 int caps_use_count; /* in use */
303 int caps_reserve_count; /* unused, reserved */
304 int caps_avail_count; /* unused, unreserved */
305 int caps_min_count; /* keep at least this many
306 (unreserved) */
Sage Weil2f2dc052009-10-06 11:31:09 -0700307 spinlock_t dentry_lru_lock;
308 struct list_head dentry_lru;
309 int num_dentry;
310};
311
312extern const char *ceph_mds_op_name(int op);
313
314extern struct ceph_mds_session *
315__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
316
317static inline struct ceph_mds_session *
318ceph_get_mds_session(struct ceph_mds_session *s)
319{
320 atomic_inc(&s->s_ref);
321 return s;
322}
323
324extern void ceph_put_mds_session(struct ceph_mds_session *s);
325
326extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
327 struct ceph_msg *msg, int mds);
328
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700329extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
Sage Weil2f2dc052009-10-06 11:31:09 -0700330extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700331extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
Sage Weil2f2dc052009-10-06 11:31:09 -0700332
333extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
334
335extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
336 struct inode *inode,
Sage Weil2f90b852011-07-26 11:28:25 -0700337 struct dentry *dn);
Sage Weil2f2dc052009-10-06 11:31:09 -0700338
Sage Weil167c9e32010-05-14 10:02:57 -0700339extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
340
Sage Weil2f2dc052009-10-06 11:31:09 -0700341extern struct ceph_mds_request *
342ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
343extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
344 struct ceph_mds_request *req);
345extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
346 struct inode *dir,
347 struct ceph_mds_request *req);
348static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
349{
Sage Weil153c8e62009-12-07 12:31:09 -0800350 kref_get(&req->r_kref);
Sage Weil2f2dc052009-10-06 11:31:09 -0700351}
Sage Weil153c8e62009-12-07 12:31:09 -0800352extern void ceph_mdsc_release_request(struct kref *kref);
353static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
354{
355 kref_put(&req->r_kref, ceph_mdsc_release_request);
356}
Sage Weil2f2dc052009-10-06 11:31:09 -0700357
Sage Weil2b2300d2010-06-09 16:52:04 -0700358extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
Sage Weilee6b2722010-06-10 12:55:52 -0700359 struct ceph_mds_session *session);
Sage Weil3d7ded42010-06-09 16:47:10 -0700360extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
361 struct ceph_mds_session *session);
362
Sage Weil2f2dc052009-10-06 11:31:09 -0700363extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
364
365extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
366 int stop_on_nosnap);
367
368extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
369extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
370 struct inode *inode,
371 struct dentry *dentry, char action,
372 u32 seq);
373
374extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
375 struct ceph_msg *msg);
376
Sage Weil154f42c2010-06-21 13:45:04 -0700377extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
378 struct ceph_mds_session *session);
379
Sage Weil2f2dc052009-10-06 11:31:09 -0700380#endif