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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
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _FS_CEPH_MDS_CLIENT_H
3#define _FS_CEPH_MDS_CLIENT_H
4
5#include <linux/completion.h>
6#include <linux/kref.h>
7#include <linux/list.h>
8#include <linux/mutex.h>
9#include <linux/rbtree.h>
10#include <linux/spinlock.h>
11#include <linux/refcount.h>
12#include <linux/utsname.h>
13
14#include <linux/ceph/types.h>
15#include <linux/ceph/messenger.h>
16#include <linux/ceph/mdsmap.h>
17#include <linux/ceph/auth.h>
18
19/*
20 * Some lock dependencies:
21 *
22 * session->s_mutex
23 * mdsc->mutex
24 *
25 * mdsc->snap_rwsem
26 *
27 * ci->i_ceph_lock
28 * mdsc->snap_flush_lock
29 * mdsc->cap_delay_lock
30 *
31 */
32
33struct ceph_fs_client;
34struct ceph_cap;
35
36/*
37 * parsed info about a single inode. pointers are into the encoded
38 * on-wire structures within the mds reply message payload.
39 */
40struct ceph_mds_reply_info_in {
41 struct ceph_mds_reply_inode *in;
42 struct ceph_dir_layout dir_layout;
43 u32 symlink_len;
44 char *symlink;
45 u32 xattr_len;
46 char *xattr_data;
47 u64 inline_version;
48 u32 inline_len;
49 char *inline_data;
50 u32 pool_ns_len;
51 char *pool_ns_data;
52 u64 max_bytes;
53 u64 max_files;
54};
55
56struct ceph_mds_reply_dir_entry {
57 char *name;
58 u32 name_len;
59 struct ceph_mds_reply_lease *lease;
60 struct ceph_mds_reply_info_in inode;
61 loff_t offset;
62};
63
64/*
65 * parsed info about an mds reply, including information about
66 * either: 1) the target inode and/or its parent directory and dentry,
67 * and directory contents (for readdir results), or
68 * 2) the file range lock info (for fcntl F_GETLK results).
69 */
70struct ceph_mds_reply_info_parsed {
71 struct ceph_mds_reply_head *head;
72
73 /* trace */
74 struct ceph_mds_reply_info_in diri, targeti;
75 struct ceph_mds_reply_dirfrag *dirfrag;
76 char *dname;
77 u32 dname_len;
78 struct ceph_mds_reply_lease *dlease;
79
80 /* extra */
81 union {
82 /* for fcntl F_GETLK results */
83 struct ceph_filelock *filelock_reply;
84
85 /* for readdir results */
86 struct {
87 struct ceph_mds_reply_dirfrag *dir_dir;
88 size_t dir_buf_size;
89 int dir_nr;
90 bool dir_end;
91 bool dir_complete;
92 bool hash_order;
93 bool offset_hash;
94 struct ceph_mds_reply_dir_entry *dir_entries;
95 };
96
97 /* for create results */
98 struct {
99 bool has_create_ino;
100 u64 ino;
101 };
102 };
103
104 /* encoded blob describing snapshot contexts for certain
105 operations (e.g., open) */
106 void *snapblob;
107 int snapblob_len;
108};
109
110
111/*
112 * cap releases are batched and sent to the MDS en masse.
113 *
114 * Account for per-message overhead of mds_cap_release header
115 * and __le32 for osd epoch barrier trailing field.
116 */
117#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
118 sizeof(struct ceph_mds_cap_release)) / \
119 sizeof(struct ceph_mds_cap_item))
120
121
122/*
123 * state associated with each MDS<->client session
124 */
125enum {
126 CEPH_MDS_SESSION_NEW = 1,
127 CEPH_MDS_SESSION_OPENING = 2,
128 CEPH_MDS_SESSION_OPEN = 3,
129 CEPH_MDS_SESSION_HUNG = 4,
130 CEPH_MDS_SESSION_CLOSING = 5,
131 CEPH_MDS_SESSION_RESTARTING = 6,
132 CEPH_MDS_SESSION_RECONNECTING = 7,
133 CEPH_MDS_SESSION_REJECTED = 8,
134};
135
136struct ceph_mds_session {
137 struct ceph_mds_client *s_mdsc;
138 int s_mds;
139 int s_state;
140 unsigned long s_ttl; /* time until mds kills us */
141 u64 s_seq; /* incoming msg seq # */
142 struct mutex s_mutex; /* serialize session messages */
143
144 struct ceph_connection s_con;
145
146 struct ceph_auth_handshake s_auth;
147
148 /* protected by s_gen_ttl_lock */
149 spinlock_t s_gen_ttl_lock;
150 u32 s_cap_gen; /* inc each time we get mds stale msg */
151 unsigned long s_cap_ttl; /* when session caps expire */
152
153 /* protected by s_cap_lock */
154 spinlock_t s_cap_lock;
155 struct list_head s_caps; /* all caps issued by this session */
156 int s_nr_caps, s_trim_caps;
157 int s_num_cap_releases;
158 int s_cap_reconnect;
159 int s_readonly;
160 struct list_head s_cap_releases; /* waiting cap_release messages */
161 struct ceph_cap *s_cap_iterator;
162
163 /* protected by mutex */
164 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
165 unsigned long s_renew_requested; /* last time we sent a renew req */
166 u64 s_renew_seq;
167
168 refcount_t s_ref;
169 struct list_head s_waiting; /* waiting requests */
170 struct list_head s_unsafe; /* unsafe requests */
171};
172
173/*
174 * modes of choosing which MDS to send a request to
175 */
176enum {
177 USE_ANY_MDS,
178 USE_RANDOM_MDS,
179 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
180};
181
182struct ceph_mds_request;
183struct ceph_mds_client;
184
185/*
186 * request completion callback
187 */
188typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
189 struct ceph_mds_request *req);
190/*
191 * wait for request completion callback
192 */
193typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
194 struct ceph_mds_request *req);
195
196/*
197 * an in-flight mds request
198 */
199struct ceph_mds_request {
200 u64 r_tid; /* transaction id */
201 struct rb_node r_node;
202 struct ceph_mds_client *r_mdsc;
203
204 int r_op; /* mds op code */
205
206 /* operation on what? */
207 struct inode *r_inode; /* arg1 */
208 struct dentry *r_dentry; /* arg1 */
209 struct dentry *r_old_dentry; /* arg2: rename from or link from */
210 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
211 char *r_path1, *r_path2;
212 struct ceph_vino r_ino1, r_ino2;
213
214 struct inode *r_parent; /* parent dir inode */
215 struct inode *r_target_inode; /* resulting inode */
216
217#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
218#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
219#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
220#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
221#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
222#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
223#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
224 unsigned long r_req_flags;
225
226 struct mutex r_fill_mutex;
227
228 union ceph_mds_request_args r_args;
229 int r_fmode; /* file mode, if expecting cap */
230 kuid_t r_uid;
231 kgid_t r_gid;
232 struct timespec r_stamp;
233
234 /* for choosing which mds to send this request to */
235 int r_direct_mode;
236 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
237
238 /* data payload is used for xattr ops */
239 struct ceph_pagelist *r_pagelist;
240
241 /* what caps shall we drop? */
242 int r_inode_drop, r_inode_unless;
243 int r_dentry_drop, r_dentry_unless;
244 int r_old_dentry_drop, r_old_dentry_unless;
245 struct inode *r_old_inode;
246 int r_old_inode_drop, r_old_inode_unless;
247
248 struct ceph_msg *r_request; /* original request */
249 int r_request_release_offset;
250 struct ceph_msg *r_reply;
251 struct ceph_mds_reply_info_parsed r_reply_info;
252 struct page *r_locked_page;
253 int r_err;
254
255 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
256 unsigned long r_started; /* start time to measure timeout against */
257 unsigned long r_request_started; /* start time for mds request only,
258 used to measure lease durations */
259
260 /* link unsafe requests to parent directory, for fsync */
261 struct inode *r_unsafe_dir;
262 struct list_head r_unsafe_dir_item;
263
264 /* unsafe requests that modify the target inode */
265 struct list_head r_unsafe_target_item;
266
267 struct ceph_mds_session *r_session;
268
269 int r_attempts; /* resend attempts */
270 int r_num_fwd; /* number of forward attempts */
271 int r_resend_mds; /* mds to resend to next, if any*/
272 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
273
274 struct kref r_kref;
275 struct list_head r_wait;
276 struct completion r_completion;
277 struct completion r_safe_completion;
278 ceph_mds_request_callback_t r_callback;
279 ceph_mds_request_wait_callback_t r_wait_for_completion;
280 struct list_head r_unsafe_item; /* per-session unsafe list item */
281
282 long long r_dir_release_cnt;
283 long long r_dir_ordered_cnt;
284 int r_readdir_cache_idx;
285 u32 r_readdir_offset;
286
287 struct ceph_cap_reservation r_caps_reservation;
288 int r_num_caps;
289};
290
291struct ceph_pool_perm {
292 struct rb_node node;
293 int perm;
294 s64 pool;
295 size_t pool_ns_len;
296 char pool_ns[];
297};
298
299/*
300 * mds client state
301 */
302struct ceph_mds_client {
303 struct ceph_fs_client *fsc;
304 struct mutex mutex; /* all nested structures */
305
306 struct ceph_mdsmap *mdsmap;
307 struct completion safe_umount_waiters;
308 wait_queue_head_t session_close_wq;
309 struct list_head waiting_for_map;
310 int mdsmap_err;
311
312 struct ceph_mds_session **sessions; /* NULL for mds if no session */
313 atomic_t num_sessions;
314 int max_sessions; /* len of s_mds_sessions */
315 int stopping; /* true if shutting down */
316
317 atomic64_t quotarealms_count; /* # realms with quota */
318
319 /*
320 * snap_rwsem will cover cap linkage into snaprealms, and
321 * realm snap contexts. (later, we can do per-realm snap
322 * contexts locks..) the empty list contains realms with no
323 * references (implying they contain no inodes with caps) that
324 * should be destroyed.
325 */
326 u64 last_snap_seq;
327 struct rw_semaphore snap_rwsem;
328 struct rb_root snap_realms;
329 struct list_head snap_empty;
330 spinlock_t snap_empty_lock; /* protect snap_empty */
331
332 u64 last_tid; /* most recent mds request */
333 u64 oldest_tid; /* oldest incomplete mds request,
334 excluding setfilelock requests */
335 struct rb_root request_tree; /* pending mds requests */
336 struct delayed_work delayed_work; /* delayed work */
337 unsigned long last_renew_caps; /* last time we renewed our caps */
338 struct list_head cap_delay_list; /* caps with delayed release */
339 spinlock_t cap_delay_lock; /* protects cap_delay_list */
340 struct list_head snap_flush_list; /* cap_snaps ready to flush */
341 spinlock_t snap_flush_lock;
342
343 u64 last_cap_flush_tid;
344 struct list_head cap_flush_list;
345 struct list_head cap_dirty; /* inodes with dirty caps */
346 struct list_head cap_dirty_migrating; /* ...that are migration... */
347 int num_cap_flushing; /* # caps we are flushing */
348 spinlock_t cap_dirty_lock; /* protects above items */
349 wait_queue_head_t cap_flushing_wq;
350
351 /*
352 * Cap reservations
353 *
354 * Maintain a global pool of preallocated struct ceph_caps, referenced
355 * by struct ceph_caps_reservations. This ensures that we preallocate
356 * memory needed to successfully process an MDS response. (If an MDS
357 * sends us cap information and we fail to process it, we will have
358 * problems due to the client and MDS being out of sync.)
359 *
360 * Reservations are 'owned' by a ceph_cap_reservation context.
361 */
362 spinlock_t caps_list_lock;
363 struct list_head caps_list; /* unused (reserved or
364 unreserved) */
365 int caps_total_count; /* total caps allocated */
366 int caps_use_count; /* in use */
367 int caps_reserve_count; /* unused, reserved */
368 int caps_avail_count; /* unused, unreserved */
369 int caps_min_count; /* keep at least this many
370 (unreserved) */
371 spinlock_t dentry_lru_lock;
372 struct list_head dentry_lru;
373 int num_dentry;
374
375 struct rw_semaphore pool_perm_rwsem;
376 struct rb_root pool_perm_tree;
377
378 char nodename[__NEW_UTS_LEN + 1];
379};
380
381extern const char *ceph_mds_op_name(int op);
382
383extern struct ceph_mds_session *
384__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
385
386static inline struct ceph_mds_session *
387ceph_get_mds_session(struct ceph_mds_session *s)
388{
389 refcount_inc(&s->s_ref);
390 return s;
391}
392
393extern const char *ceph_session_state_name(int s);
394
395extern void ceph_put_mds_session(struct ceph_mds_session *s);
396
397extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
398 struct ceph_msg *msg, int mds);
399
400extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
401extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
402extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
403extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
404
405extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
406
407extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
408extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
409 struct inode *dir);
410extern struct ceph_mds_request *
411ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
412extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
413 struct ceph_mds_request *req);
414extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
415 struct inode *dir,
416 struct ceph_mds_request *req);
417static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
418{
419 kref_get(&req->r_kref);
420}
421extern void ceph_mdsc_release_request(struct kref *kref);
422static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
423{
424 kref_put(&req->r_kref, ceph_mdsc_release_request);
425}
426
427extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
428 struct ceph_mds_session *session);
429
430extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
431
432extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
433 int stop_on_nosnap);
434
435extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
436extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
437 struct inode *inode,
438 struct dentry *dentry, char action,
439 u32 seq);
440
441extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
442 struct ceph_msg *msg);
443extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
444 struct ceph_msg *msg);
445
446extern struct ceph_mds_session *
447ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
448extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
449 struct ceph_mds_session *session);
450
451extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
452 struct ceph_mds_session *session,
453 int max_caps);
454#endif