Loading...
1#ifndef _FS_CEPH_MDS_CLIENT_H
2#define _FS_CEPH_MDS_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/kref.h>
6#include <linux/list.h>
7#include <linux/mutex.h>
8#include <linux/rbtree.h>
9#include <linux/spinlock.h>
10
11#include <linux/ceph/types.h>
12#include <linux/ceph/messenger.h>
13#include <linux/ceph/mdsmap.h>
14#include <linux/ceph/auth.h>
15
16/*
17 * Some lock dependencies:
18 *
19 * session->s_mutex
20 * mdsc->mutex
21 *
22 * mdsc->snap_rwsem
23 *
24 * ci->i_ceph_lock
25 * mdsc->snap_flush_lock
26 * mdsc->cap_delay_lock
27 *
28 */
29
30struct ceph_fs_client;
31struct 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 */
37struct ceph_mds_reply_info_in {
38 struct ceph_mds_reply_inode *in;
39 struct ceph_dir_layout dir_layout;
40 u32 symlink_len;
41 char *symlink;
42 u32 xattr_len;
43 char *xattr_data;
44};
45
46/*
47 * parsed info about an mds reply, including information about
48 * either: 1) the target inode and/or its parent directory and dentry,
49 * and directory contents (for readdir results), or
50 * 2) the file range lock info (for fcntl F_GETLK results).
51 */
52struct ceph_mds_reply_info_parsed {
53 struct ceph_mds_reply_head *head;
54
55 /* trace */
56 struct ceph_mds_reply_info_in diri, targeti;
57 struct ceph_mds_reply_dirfrag *dirfrag;
58 char *dname;
59 u32 dname_len;
60 struct ceph_mds_reply_lease *dlease;
61
62 /* extra */
63 union {
64 /* for fcntl F_GETLK results */
65 struct ceph_filelock *filelock_reply;
66
67 /* for readdir results */
68 struct {
69 struct ceph_mds_reply_dirfrag *dir_dir;
70 size_t dir_buf_size;
71 int dir_nr;
72 char **dir_dname;
73 u32 *dir_dname_len;
74 struct ceph_mds_reply_lease **dir_dlease;
75 struct ceph_mds_reply_info_in *dir_in;
76 u8 dir_complete, dir_end;
77 };
78
79 /* for create results */
80 struct {
81 bool has_create_ino;
82 u64 ino;
83 };
84 };
85
86 /* encoded blob describing snapshot contexts for certain
87 operations (e.g., open) */
88 void *snapblob;
89 int snapblob_len;
90};
91
92
93/*
94 * cap releases are batched and sent to the MDS en masse.
95 */
96#define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \
97 sizeof(struct ceph_mds_cap_release)) / \
98 sizeof(struct ceph_mds_cap_item))
99
100
101/*
102 * state associated with each MDS<->client session
103 */
104enum {
105 CEPH_MDS_SESSION_NEW = 1,
106 CEPH_MDS_SESSION_OPENING = 2,
107 CEPH_MDS_SESSION_OPEN = 3,
108 CEPH_MDS_SESSION_HUNG = 4,
109 CEPH_MDS_SESSION_CLOSING = 5,
110 CEPH_MDS_SESSION_RESTARTING = 6,
111 CEPH_MDS_SESSION_RECONNECTING = 7,
112};
113
114struct ceph_mds_session {
115 struct ceph_mds_client *s_mdsc;
116 int s_mds;
117 int s_state;
118 unsigned long s_ttl; /* time until mds kills us */
119 u64 s_seq; /* incoming msg seq # */
120 struct mutex s_mutex; /* serialize session messages */
121
122 struct ceph_connection s_con;
123
124 struct ceph_auth_handshake s_auth;
125
126 /* protected by s_gen_ttl_lock */
127 spinlock_t s_gen_ttl_lock;
128 u32 s_cap_gen; /* inc each time we get mds stale msg */
129 unsigned long s_cap_ttl; /* when session caps expire */
130
131 /* protected by s_cap_lock */
132 spinlock_t s_cap_lock;
133 struct list_head s_caps; /* all caps issued by this session */
134 int s_nr_caps, s_trim_caps;
135 int s_num_cap_releases;
136 int s_cap_reconnect;
137 struct list_head s_cap_releases; /* waiting cap_release messages */
138 struct list_head s_cap_releases_done; /* ready to send */
139 struct ceph_cap *s_cap_iterator;
140
141 /* protected by mutex */
142 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
143 struct list_head s_cap_snaps_flushing;
144 unsigned long s_renew_requested; /* last time we sent a renew req */
145 u64 s_renew_seq;
146
147 atomic_t s_ref;
148 struct list_head s_waiting; /* waiting requests */
149 struct list_head s_unsafe; /* unsafe requests */
150};
151
152/*
153 * modes of choosing which MDS to send a request to
154 */
155enum {
156 USE_ANY_MDS,
157 USE_RANDOM_MDS,
158 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
159};
160
161struct ceph_mds_request;
162struct ceph_mds_client;
163
164/*
165 * request completion callback
166 */
167typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
168 struct ceph_mds_request *req);
169
170/*
171 * an in-flight mds request
172 */
173struct ceph_mds_request {
174 u64 r_tid; /* transaction id */
175 struct rb_node r_node;
176 struct ceph_mds_client *r_mdsc;
177
178 int r_op; /* mds op code */
179
180 /* operation on what? */
181 struct inode *r_inode; /* arg1 */
182 struct dentry *r_dentry; /* arg1 */
183 struct dentry *r_old_dentry; /* arg2: rename from or link from */
184 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
185 char *r_path1, *r_path2;
186 struct ceph_vino r_ino1, r_ino2;
187
188 struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
189 struct inode *r_target_inode; /* resulting inode */
190
191 struct mutex r_fill_mutex;
192
193 union ceph_mds_request_args r_args;
194 int r_fmode; /* file mode, if expecting cap */
195 kuid_t r_uid;
196 kgid_t r_gid;
197
198 /* for choosing which mds to send this request to */
199 int r_direct_mode;
200 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
201 bool r_direct_is_hash; /* true if r_direct_hash is valid */
202
203 /* data payload is used for xattr ops */
204 struct page **r_pages;
205 int r_num_pages;
206 int r_data_len;
207
208 /* what caps shall we drop? */
209 int r_inode_drop, r_inode_unless;
210 int r_dentry_drop, r_dentry_unless;
211 int r_old_dentry_drop, r_old_dentry_unless;
212 struct inode *r_old_inode;
213 int r_old_inode_drop, r_old_inode_unless;
214
215 struct ceph_msg *r_request; /* original request */
216 int r_request_release_offset;
217 struct ceph_msg *r_reply;
218 struct ceph_mds_reply_info_parsed r_reply_info;
219 int r_err;
220 bool r_aborted;
221
222 unsigned long r_timeout; /* optional. jiffies */
223 unsigned long r_started; /* start time to measure timeout against */
224 unsigned long r_request_started; /* start time for mds request only,
225 used to measure lease durations */
226
227 /* link unsafe requests to parent directory, for fsync */
228 struct inode *r_unsafe_dir;
229 struct list_head r_unsafe_dir_item;
230
231 struct ceph_mds_session *r_session;
232
233 int r_attempts; /* resend attempts */
234 int r_num_fwd; /* number of forward attempts */
235 int r_resend_mds; /* mds to resend to next, if any*/
236 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
237
238 struct kref r_kref;
239 struct list_head r_wait;
240 struct completion r_completion;
241 struct completion r_safe_completion;
242 ceph_mds_request_callback_t r_callback;
243 struct list_head r_unsafe_item; /* per-session unsafe list item */
244 bool r_got_unsafe, r_got_safe, r_got_result;
245
246 bool r_did_prepopulate;
247 u32 r_readdir_offset;
248
249 struct ceph_cap_reservation r_caps_reservation;
250 int r_num_caps;
251};
252
253/*
254 * mds client state
255 */
256struct ceph_mds_client {
257 struct ceph_fs_client *fsc;
258 struct mutex mutex; /* all nested structures */
259
260 struct ceph_mdsmap *mdsmap;
261 struct completion safe_umount_waiters;
262 wait_queue_head_t session_close_wq;
263 struct list_head waiting_for_map;
264
265 struct ceph_mds_session **sessions; /* NULL for mds if no session */
266 int max_sessions; /* len of s_mds_sessions */
267 int stopping; /* true if shutting down */
268
269 /*
270 * snap_rwsem will cover cap linkage into snaprealms, and
271 * realm snap contexts. (later, we can do per-realm snap
272 * contexts locks..) the empty list contains realms with no
273 * references (implying they contain no inodes with caps) that
274 * should be destroyed.
275 */
276 struct rw_semaphore snap_rwsem;
277 struct rb_root snap_realms;
278 struct list_head snap_empty;
279 spinlock_t snap_empty_lock; /* protect snap_empty */
280
281 u64 last_tid; /* most recent mds request */
282 struct rb_root request_tree; /* pending mds requests */
283 struct delayed_work delayed_work; /* delayed work */
284 unsigned long last_renew_caps; /* last time we renewed our caps */
285 struct list_head cap_delay_list; /* caps with delayed release */
286 spinlock_t cap_delay_lock; /* protects cap_delay_list */
287 struct list_head snap_flush_list; /* cap_snaps ready to flush */
288 spinlock_t snap_flush_lock;
289
290 u64 cap_flush_seq;
291 struct list_head cap_dirty; /* inodes with dirty caps */
292 struct list_head cap_dirty_migrating; /* ...that are migration... */
293 int num_cap_flushing; /* # caps we are flushing */
294 spinlock_t cap_dirty_lock; /* protects above items */
295 wait_queue_head_t cap_flushing_wq;
296
297 /*
298 * Cap reservations
299 *
300 * Maintain a global pool of preallocated struct ceph_caps, referenced
301 * by struct ceph_caps_reservations. This ensures that we preallocate
302 * memory needed to successfully process an MDS response. (If an MDS
303 * sends us cap information and we fail to process it, we will have
304 * problems due to the client and MDS being out of sync.)
305 *
306 * Reservations are 'owned' by a ceph_cap_reservation context.
307 */
308 spinlock_t caps_list_lock;
309 struct list_head caps_list; /* unused (reserved or
310 unreserved) */
311 int caps_total_count; /* total caps allocated */
312 int caps_use_count; /* in use */
313 int caps_reserve_count; /* unused, reserved */
314 int caps_avail_count; /* unused, unreserved */
315 int caps_min_count; /* keep at least this many
316 (unreserved) */
317 spinlock_t dentry_lru_lock;
318 struct list_head dentry_lru;
319 int num_dentry;
320};
321
322extern const char *ceph_mds_op_name(int op);
323
324extern struct ceph_mds_session *
325__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
326
327static inline struct ceph_mds_session *
328ceph_get_mds_session(struct ceph_mds_session *s)
329{
330 atomic_inc(&s->s_ref);
331 return s;
332}
333
334extern void ceph_put_mds_session(struct ceph_mds_session *s);
335
336extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
337 struct ceph_msg *msg, int mds);
338
339extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
340extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
341extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
342
343extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
344
345extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
346 struct inode *inode,
347 struct dentry *dn);
348
349extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
350extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
351 struct inode *dir);
352extern struct ceph_mds_request *
353ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
354extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
355 struct ceph_mds_request *req);
356extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
357 struct inode *dir,
358 struct ceph_mds_request *req);
359static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
360{
361 kref_get(&req->r_kref);
362}
363extern void ceph_mdsc_release_request(struct kref *kref);
364static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
365{
366 kref_put(&req->r_kref, ceph_mdsc_release_request);
367}
368
369extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
370 struct ceph_mds_session *session);
371extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
372 struct ceph_mds_session *session);
373
374extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
375
376extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
377 int stop_on_nosnap);
378
379extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
380extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
381 struct inode *inode,
382 struct dentry *dentry, char action,
383 u32 seq);
384
385extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
386 struct ceph_msg *msg);
387
388extern struct ceph_mds_session *
389ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
390extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
391 struct ceph_mds_session *session);
392
393#endif
1#ifndef _FS_CEPH_MDS_CLIENT_H
2#define _FS_CEPH_MDS_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/kref.h>
6#include <linux/list.h>
7#include <linux/mutex.h>
8#include <linux/rbtree.h>
9#include <linux/spinlock.h>
10
11#include <linux/ceph/types.h>
12#include <linux/ceph/messenger.h>
13#include <linux/ceph/mdsmap.h>
14#include <linux/ceph/auth.h>
15
16/*
17 * Some lock dependencies:
18 *
19 * session->s_mutex
20 * mdsc->mutex
21 *
22 * mdsc->snap_rwsem
23 *
24 * ci->i_ceph_lock
25 * mdsc->snap_flush_lock
26 * mdsc->cap_delay_lock
27 *
28 */
29
30struct ceph_fs_client;
31struct 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 */
37struct ceph_mds_reply_info_in {
38 struct ceph_mds_reply_inode *in;
39 struct ceph_dir_layout dir_layout;
40 u32 symlink_len;
41 char *symlink;
42 u32 xattr_len;
43 char *xattr_data;
44};
45
46/*
47 * parsed info about an mds reply, including information about
48 * either: 1) the target inode and/or its parent directory and dentry,
49 * and directory contents (for readdir results), or
50 * 2) the file range lock info (for fcntl F_GETLK results).
51 */
52struct ceph_mds_reply_info_parsed {
53 struct ceph_mds_reply_head *head;
54
55 /* trace */
56 struct ceph_mds_reply_info_in diri, targeti;
57 struct ceph_mds_reply_dirfrag *dirfrag;
58 char *dname;
59 u32 dname_len;
60 struct ceph_mds_reply_lease *dlease;
61
62 /* extra */
63 union {
64 /* for fcntl F_GETLK results */
65 struct ceph_filelock *filelock_reply;
66
67 /* for readdir results */
68 struct {
69 struct ceph_mds_reply_dirfrag *dir_dir;
70 int dir_nr;
71 char **dir_dname;
72 u32 *dir_dname_len;
73 struct ceph_mds_reply_lease **dir_dlease;
74 struct ceph_mds_reply_info_in *dir_in;
75 u8 dir_complete, dir_end;
76 };
77 };
78
79 /* encoded blob describing snapshot contexts for certain
80 operations (e.g., open) */
81 void *snapblob;
82 int snapblob_len;
83};
84
85
86/*
87 * cap releases are batched and sent to the MDS en masse.
88 */
89#define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \
90 sizeof(struct ceph_mds_cap_release)) / \
91 sizeof(struct ceph_mds_cap_item))
92
93
94/*
95 * state associated with each MDS<->client session
96 */
97enum {
98 CEPH_MDS_SESSION_NEW = 1,
99 CEPH_MDS_SESSION_OPENING = 2,
100 CEPH_MDS_SESSION_OPEN = 3,
101 CEPH_MDS_SESSION_HUNG = 4,
102 CEPH_MDS_SESSION_CLOSING = 5,
103 CEPH_MDS_SESSION_RESTARTING = 6,
104 CEPH_MDS_SESSION_RECONNECTING = 7,
105};
106
107struct ceph_mds_session {
108 struct ceph_mds_client *s_mdsc;
109 int s_mds;
110 int s_state;
111 unsigned long s_ttl; /* time until mds kills us */
112 u64 s_seq; /* incoming msg seq # */
113 struct mutex s_mutex; /* serialize session messages */
114
115 struct ceph_connection s_con;
116
117 struct ceph_auth_handshake s_auth;
118
119 /* protected by s_gen_ttl_lock */
120 spinlock_t s_gen_ttl_lock;
121 u32 s_cap_gen; /* inc each time we get mds stale msg */
122 unsigned long s_cap_ttl; /* when session caps expire */
123
124 /* protected by s_cap_lock */
125 spinlock_t s_cap_lock;
126 struct list_head s_caps; /* all caps issued by this session */
127 int s_nr_caps, s_trim_caps;
128 int s_num_cap_releases;
129 struct list_head s_cap_releases; /* waiting cap_release messages */
130 struct list_head s_cap_releases_done; /* ready to send */
131 struct ceph_cap *s_cap_iterator;
132
133 /* protected by mutex */
134 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
135 struct list_head s_cap_snaps_flushing;
136 unsigned long s_renew_requested; /* last time we sent a renew req */
137 u64 s_renew_seq;
138
139 atomic_t s_ref;
140 struct list_head s_waiting; /* waiting requests */
141 struct list_head s_unsafe; /* unsafe requests */
142};
143
144/*
145 * modes of choosing which MDS to send a request to
146 */
147enum {
148 USE_ANY_MDS,
149 USE_RANDOM_MDS,
150 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
151};
152
153struct ceph_mds_request;
154struct ceph_mds_client;
155
156/*
157 * request completion callback
158 */
159typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
160 struct ceph_mds_request *req);
161
162/*
163 * an in-flight mds request
164 */
165struct ceph_mds_request {
166 u64 r_tid; /* transaction id */
167 struct rb_node r_node;
168 struct ceph_mds_client *r_mdsc;
169
170 int r_op; /* mds op code */
171
172 /* operation on what? */
173 struct inode *r_inode; /* arg1 */
174 struct dentry *r_dentry; /* arg1 */
175 struct dentry *r_old_dentry; /* arg2: rename from or link from */
176 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
177 char *r_path1, *r_path2;
178 struct ceph_vino r_ino1, r_ino2;
179
180 struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
181 struct inode *r_target_inode; /* resulting inode */
182
183 struct mutex r_fill_mutex;
184
185 union ceph_mds_request_args r_args;
186 int r_fmode; /* file mode, if expecting cap */
187 uid_t r_uid;
188 gid_t r_gid;
189
190 /* for choosing which mds to send this request to */
191 int r_direct_mode;
192 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
193 bool r_direct_is_hash; /* true if r_direct_hash is valid */
194
195 /* data payload is used for xattr ops */
196 struct page **r_pages;
197 int r_num_pages;
198 int r_data_len;
199
200 /* what caps shall we drop? */
201 int r_inode_drop, r_inode_unless;
202 int r_dentry_drop, r_dentry_unless;
203 int r_old_dentry_drop, r_old_dentry_unless;
204 struct inode *r_old_inode;
205 int r_old_inode_drop, r_old_inode_unless;
206
207 struct ceph_msg *r_request; /* original request */
208 int r_request_release_offset;
209 struct ceph_msg *r_reply;
210 struct ceph_mds_reply_info_parsed r_reply_info;
211 int r_err;
212 bool r_aborted;
213
214 unsigned long r_timeout; /* optional. jiffies */
215 unsigned long r_started; /* start time to measure timeout against */
216 unsigned long r_request_started; /* start time for mds request only,
217 used to measure lease durations */
218
219 /* link unsafe requests to parent directory, for fsync */
220 struct inode *r_unsafe_dir;
221 struct list_head r_unsafe_dir_item;
222
223 struct ceph_mds_session *r_session;
224
225 int r_attempts; /* resend attempts */
226 int r_num_fwd; /* number of forward attempts */
227 int r_resend_mds; /* mds to resend to next, if any*/
228 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
229
230 struct kref r_kref;
231 struct list_head r_wait;
232 struct completion r_completion;
233 struct completion r_safe_completion;
234 ceph_mds_request_callback_t r_callback;
235 struct list_head r_unsafe_item; /* per-session unsafe list item */
236 bool r_got_unsafe, r_got_safe, r_got_result;
237
238 bool r_did_prepopulate;
239 u32 r_readdir_offset;
240
241 struct ceph_cap_reservation r_caps_reservation;
242 int r_num_caps;
243};
244
245/*
246 * mds client state
247 */
248struct ceph_mds_client {
249 struct ceph_fs_client *fsc;
250 struct mutex mutex; /* all nested structures */
251
252 struct ceph_mdsmap *mdsmap;
253 struct completion safe_umount_waiters;
254 wait_queue_head_t session_close_wq;
255 struct list_head waiting_for_map;
256
257 struct ceph_mds_session **sessions; /* NULL for mds if no session */
258 int max_sessions; /* len of s_mds_sessions */
259 int stopping; /* true if shutting down */
260
261 /*
262 * snap_rwsem will cover cap linkage into snaprealms, and
263 * realm snap contexts. (later, we can do per-realm snap
264 * contexts locks..) the empty list contains realms with no
265 * references (implying they contain no inodes with caps) that
266 * should be destroyed.
267 */
268 struct rw_semaphore snap_rwsem;
269 struct rb_root snap_realms;
270 struct list_head snap_empty;
271 spinlock_t snap_empty_lock; /* protect snap_empty */
272
273 u64 last_tid; /* most recent mds request */
274 struct rb_root request_tree; /* pending mds requests */
275 struct delayed_work delayed_work; /* delayed work */
276 unsigned long last_renew_caps; /* last time we renewed our caps */
277 struct list_head cap_delay_list; /* caps with delayed release */
278 spinlock_t cap_delay_lock; /* protects cap_delay_list */
279 struct list_head snap_flush_list; /* cap_snaps ready to flush */
280 spinlock_t snap_flush_lock;
281
282 u64 cap_flush_seq;
283 struct list_head cap_dirty; /* inodes with dirty caps */
284 struct list_head cap_dirty_migrating; /* ...that are migration... */
285 int num_cap_flushing; /* # caps we are flushing */
286 spinlock_t cap_dirty_lock; /* protects above items */
287 wait_queue_head_t cap_flushing_wq;
288
289 /*
290 * Cap reservations
291 *
292 * Maintain a global pool of preallocated struct ceph_caps, referenced
293 * by struct ceph_caps_reservations. This ensures that we preallocate
294 * memory needed to successfully process an MDS response. (If an MDS
295 * sends us cap information and we fail to process it, we will have
296 * problems due to the client and MDS being out of sync.)
297 *
298 * Reservations are 'owned' by a ceph_cap_reservation context.
299 */
300 spinlock_t caps_list_lock;
301 struct list_head caps_list; /* unused (reserved or
302 unreserved) */
303 int caps_total_count; /* total caps allocated */
304 int caps_use_count; /* in use */
305 int caps_reserve_count; /* unused, reserved */
306 int caps_avail_count; /* unused, unreserved */
307 int caps_min_count; /* keep at least this many
308 (unreserved) */
309 spinlock_t dentry_lru_lock;
310 struct list_head dentry_lru;
311 int num_dentry;
312};
313
314extern const char *ceph_mds_op_name(int op);
315
316extern struct ceph_mds_session *
317__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
318
319static inline struct ceph_mds_session *
320ceph_get_mds_session(struct ceph_mds_session *s)
321{
322 atomic_inc(&s->s_ref);
323 return s;
324}
325
326extern void ceph_put_mds_session(struct ceph_mds_session *s);
327
328extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
329 struct ceph_msg *msg, int mds);
330
331extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
332extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
333extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
334
335extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
336
337extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
338 struct inode *inode,
339 struct dentry *dn);
340
341extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
342
343extern struct ceph_mds_request *
344ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
345extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
346 struct ceph_mds_request *req);
347extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
348 struct inode *dir,
349 struct ceph_mds_request *req);
350static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
351{
352 kref_get(&req->r_kref);
353}
354extern void ceph_mdsc_release_request(struct kref *kref);
355static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
356{
357 kref_put(&req->r_kref, ceph_mdsc_release_request);
358}
359
360extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
361 struct ceph_mds_session *session);
362extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
363 struct ceph_mds_session *session);
364
365extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
366
367extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
368 int stop_on_nosnap);
369
370extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
371extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
372 struct inode *inode,
373 struct dentry *dentry, char action,
374 u32 seq);
375
376extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
377 struct ceph_msg *msg);
378
379extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
380 struct ceph_mds_session *session);
381
382#endif