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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 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/* 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#include <linux/ktime.h>
14
15#include <linux/ceph/types.h>
16#include <linux/ceph/messenger.h>
17#include <linux/ceph/mdsmap.h>
18#include <linux/ceph/auth.h>
19
20#include "metric.h"
21#include "super.h"
22
23/* The first 8 bits are reserved for old ceph releases */
24enum ceph_feature_type {
25 CEPHFS_FEATURE_MIMIC = 8,
26 CEPHFS_FEATURE_REPLY_ENCODING,
27 CEPHFS_FEATURE_RECLAIM_CLIENT,
28 CEPHFS_FEATURE_LAZY_CAP_WANTED,
29 CEPHFS_FEATURE_MULTI_RECONNECT,
30 CEPHFS_FEATURE_DELEG_INO,
31 CEPHFS_FEATURE_METRIC_COLLECT,
32
33 CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_METRIC_COLLECT,
34};
35
36/*
37 * This will always have the highest feature bit value
38 * as the last element of the array.
39 */
40#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
41 0, 1, 2, 3, 4, 5, 6, 7, \
42 CEPHFS_FEATURE_MIMIC, \
43 CEPHFS_FEATURE_REPLY_ENCODING, \
44 CEPHFS_FEATURE_LAZY_CAP_WANTED, \
45 CEPHFS_FEATURE_MULTI_RECONNECT, \
46 CEPHFS_FEATURE_DELEG_INO, \
47 CEPHFS_FEATURE_METRIC_COLLECT, \
48 \
49 CEPHFS_FEATURE_MAX, \
50}
51#define CEPHFS_FEATURES_CLIENT_REQUIRED {}
52
53/*
54 * Some lock dependencies:
55 *
56 * session->s_mutex
57 * mdsc->mutex
58 *
59 * mdsc->snap_rwsem
60 *
61 * ci->i_ceph_lock
62 * mdsc->snap_flush_lock
63 * mdsc->cap_delay_lock
64 *
65 */
66
67struct ceph_fs_client;
68struct ceph_cap;
69
70/*
71 * parsed info about a single inode. pointers are into the encoded
72 * on-wire structures within the mds reply message payload.
73 */
74struct ceph_mds_reply_info_in {
75 struct ceph_mds_reply_inode *in;
76 struct ceph_dir_layout dir_layout;
77 u32 symlink_len;
78 char *symlink;
79 u32 xattr_len;
80 char *xattr_data;
81 u64 inline_version;
82 u32 inline_len;
83 char *inline_data;
84 u32 pool_ns_len;
85 char *pool_ns_data;
86 u64 max_bytes;
87 u64 max_files;
88 s32 dir_pin;
89 struct ceph_timespec btime;
90 struct ceph_timespec snap_btime;
91 u64 rsnaps;
92 u64 change_attr;
93};
94
95struct ceph_mds_reply_dir_entry {
96 char *name;
97 u32 name_len;
98 struct ceph_mds_reply_lease *lease;
99 struct ceph_mds_reply_info_in inode;
100 loff_t offset;
101};
102
103/*
104 * parsed info about an mds reply, including information about
105 * either: 1) the target inode and/or its parent directory and dentry,
106 * and directory contents (for readdir results), or
107 * 2) the file range lock info (for fcntl F_GETLK results).
108 */
109struct ceph_mds_reply_info_parsed {
110 struct ceph_mds_reply_head *head;
111
112 /* trace */
113 struct ceph_mds_reply_info_in diri, targeti;
114 struct ceph_mds_reply_dirfrag *dirfrag;
115 char *dname;
116 u32 dname_len;
117 struct ceph_mds_reply_lease *dlease;
118
119 /* extra */
120 union {
121 /* for fcntl F_GETLK results */
122 struct ceph_filelock *filelock_reply;
123
124 /* for readdir results */
125 struct {
126 struct ceph_mds_reply_dirfrag *dir_dir;
127 size_t dir_buf_size;
128 int dir_nr;
129 bool dir_end;
130 bool dir_complete;
131 bool hash_order;
132 bool offset_hash;
133 struct ceph_mds_reply_dir_entry *dir_entries;
134 };
135
136 /* for create results */
137 struct {
138 bool has_create_ino;
139 u64 ino;
140 };
141 };
142
143 /* encoded blob describing snapshot contexts for certain
144 operations (e.g., open) */
145 void *snapblob;
146 int snapblob_len;
147};
148
149
150/*
151 * cap releases are batched and sent to the MDS en masse.
152 *
153 * Account for per-message overhead of mds_cap_release header
154 * and __le32 for osd epoch barrier trailing field.
155 */
156#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
157 sizeof(struct ceph_mds_cap_release)) / \
158 sizeof(struct ceph_mds_cap_item))
159
160
161/*
162 * state associated with each MDS<->client session
163 */
164enum {
165 CEPH_MDS_SESSION_NEW = 1,
166 CEPH_MDS_SESSION_OPENING = 2,
167 CEPH_MDS_SESSION_OPEN = 3,
168 CEPH_MDS_SESSION_HUNG = 4,
169 CEPH_MDS_SESSION_RESTARTING = 5,
170 CEPH_MDS_SESSION_RECONNECTING = 6,
171 CEPH_MDS_SESSION_CLOSING = 7,
172 CEPH_MDS_SESSION_CLOSED = 8,
173 CEPH_MDS_SESSION_REJECTED = 9,
174};
175
176struct ceph_mds_session {
177 struct ceph_mds_client *s_mdsc;
178 int s_mds;
179 int s_state;
180 unsigned long s_ttl; /* time until mds kills us */
181 unsigned long s_features;
182 u64 s_seq; /* incoming msg seq # */
183 struct mutex s_mutex; /* serialize session messages */
184
185 struct ceph_connection s_con;
186
187 struct ceph_auth_handshake s_auth;
188
189 atomic_t s_cap_gen; /* inc each time we get mds stale msg */
190 unsigned long s_cap_ttl; /* when session caps expire. protected by s_mutex */
191
192 /* protected by s_cap_lock */
193 spinlock_t s_cap_lock;
194 refcount_t s_ref;
195 struct list_head s_caps; /* all caps issued by this session */
196 struct ceph_cap *s_cap_iterator;
197 int s_nr_caps;
198 int s_num_cap_releases;
199 int s_cap_reconnect;
200 int s_readonly;
201 struct list_head s_cap_releases; /* waiting cap_release messages */
202 struct work_struct s_cap_release_work;
203
204 /* See ceph_inode_info->i_dirty_item. */
205 struct list_head s_cap_dirty; /* inodes w/ dirty caps */
206
207 /* See ceph_inode_info->i_flushing_item. */
208 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
209
210 unsigned long s_renew_requested; /* last time we sent a renew req */
211 u64 s_renew_seq;
212
213 struct list_head s_waiting; /* waiting requests */
214 struct list_head s_unsafe; /* unsafe requests */
215 struct xarray s_delegated_inos;
216};
217
218/*
219 * modes of choosing which MDS to send a request to
220 */
221enum {
222 USE_ANY_MDS,
223 USE_RANDOM_MDS,
224 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
225};
226
227struct ceph_mds_request;
228struct ceph_mds_client;
229
230/*
231 * request completion callback
232 */
233typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
234 struct ceph_mds_request *req);
235/*
236 * wait for request completion callback
237 */
238typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
239 struct ceph_mds_request *req);
240
241/*
242 * an in-flight mds request
243 */
244struct ceph_mds_request {
245 u64 r_tid; /* transaction id */
246 struct rb_node r_node;
247 struct ceph_mds_client *r_mdsc;
248
249 struct kref r_kref;
250 int r_op; /* mds op code */
251
252 /* operation on what? */
253 struct inode *r_inode; /* arg1 */
254 struct dentry *r_dentry; /* arg1 */
255 struct dentry *r_old_dentry; /* arg2: rename from or link from */
256 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
257 char *r_path1, *r_path2;
258 struct ceph_vino r_ino1, r_ino2;
259
260 struct inode *r_parent; /* parent dir inode */
261 struct inode *r_target_inode; /* resulting inode */
262
263#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
264#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
265#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
266#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
267#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
268#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
269#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
270#define CEPH_MDS_R_ASYNC (8) /* async request */
271 unsigned long r_req_flags;
272
273 struct mutex r_fill_mutex;
274
275 union ceph_mds_request_args r_args;
276 int r_fmode; /* file mode, if expecting cap */
277 const struct cred *r_cred;
278 int r_request_release_offset;
279 struct timespec64 r_stamp;
280
281 /* for choosing which mds to send this request to */
282 int r_direct_mode;
283 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
284
285 /* data payload is used for xattr ops */
286 struct ceph_pagelist *r_pagelist;
287
288 /* what caps shall we drop? */
289 int r_inode_drop, r_inode_unless;
290 int r_dentry_drop, r_dentry_unless;
291 int r_old_dentry_drop, r_old_dentry_unless;
292 struct inode *r_old_inode;
293 int r_old_inode_drop, r_old_inode_unless;
294
295 struct ceph_msg *r_request; /* original request */
296 struct ceph_msg *r_reply;
297 struct ceph_mds_reply_info_parsed r_reply_info;
298 int r_err;
299
300
301 struct page *r_locked_page;
302 int r_dir_caps;
303 int r_num_caps;
304 u32 r_readdir_offset;
305
306 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
307 unsigned long r_started; /* start time to measure timeout against */
308 unsigned long r_start_latency; /* start time to measure latency */
309 unsigned long r_end_latency; /* finish time to measure latency */
310 unsigned long r_request_started; /* start time for mds request only,
311 used to measure lease durations */
312
313 /* link unsafe requests to parent directory, for fsync */
314 struct inode *r_unsafe_dir;
315 struct list_head r_unsafe_dir_item;
316
317 /* unsafe requests that modify the target inode */
318 struct list_head r_unsafe_target_item;
319
320 struct ceph_mds_session *r_session;
321
322 int r_attempts; /* resend attempts */
323 int r_num_fwd; /* number of forward attempts */
324 int r_resend_mds; /* mds to resend to next, if any*/
325 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
326 u64 r_deleg_ino;
327
328 struct list_head r_wait;
329 struct completion r_completion;
330 struct completion r_safe_completion;
331 ceph_mds_request_callback_t r_callback;
332 ceph_mds_request_wait_callback_t r_wait_for_completion;
333 struct list_head r_unsafe_item; /* per-session unsafe list item */
334
335 long long r_dir_release_cnt;
336 long long r_dir_ordered_cnt;
337 int r_readdir_cache_idx;
338
339 struct ceph_cap_reservation r_caps_reservation;
340};
341
342struct ceph_pool_perm {
343 struct rb_node node;
344 int perm;
345 s64 pool;
346 size_t pool_ns_len;
347 char pool_ns[];
348};
349
350struct ceph_snapid_map {
351 struct rb_node node;
352 struct list_head lru;
353 atomic_t ref;
354 u64 snap;
355 dev_t dev;
356 unsigned long last_used;
357};
358
359/*
360 * node for list of quotarealm inodes that are not visible from the filesystem
361 * mountpoint, but required to handle, e.g. quotas.
362 */
363struct ceph_quotarealm_inode {
364 struct rb_node node;
365 u64 ino;
366 unsigned long timeout; /* last time a lookup failed for this inode */
367 struct mutex mutex;
368 struct inode *inode;
369};
370
371struct cap_wait {
372 struct list_head list;
373 u64 ino;
374 pid_t tgid;
375 int need;
376 int want;
377};
378
379/*
380 * mds client state
381 */
382struct ceph_mds_client {
383 struct ceph_fs_client *fsc;
384 struct mutex mutex; /* all nested structures */
385
386 struct ceph_mdsmap *mdsmap;
387 struct completion safe_umount_waiters;
388 wait_queue_head_t session_close_wq;
389 struct list_head waiting_for_map;
390 int mdsmap_err;
391
392 struct ceph_mds_session **sessions; /* NULL for mds if no session */
393 atomic_t num_sessions;
394 int max_sessions; /* len of sessions array */
395 int stopping; /* true if shutting down */
396
397 atomic64_t quotarealms_count; /* # realms with quota */
398 /*
399 * We keep a list of inodes we don't see in the mountpoint but that we
400 * need to track quota realms.
401 */
402 struct rb_root quotarealms_inodes;
403 struct mutex quotarealms_inodes_mutex;
404
405 /*
406 * snap_rwsem will cover cap linkage into snaprealms, and
407 * realm snap contexts. (later, we can do per-realm snap
408 * contexts locks..) the empty list contains realms with no
409 * references (implying they contain no inodes with caps) that
410 * should be destroyed.
411 */
412 u64 last_snap_seq;
413 struct rw_semaphore snap_rwsem;
414 struct rb_root snap_realms;
415 struct list_head snap_empty;
416 int num_snap_realms;
417 spinlock_t snap_empty_lock; /* protect snap_empty */
418
419 u64 last_tid; /* most recent mds request */
420 u64 oldest_tid; /* oldest incomplete mds request,
421 excluding setfilelock requests */
422 struct rb_root request_tree; /* pending mds requests */
423 struct delayed_work delayed_work; /* delayed work */
424 unsigned long last_renew_caps; /* last time we renewed our caps */
425 struct list_head cap_delay_list; /* caps with delayed release */
426 spinlock_t cap_delay_lock; /* protects cap_delay_list */
427 struct list_head snap_flush_list; /* cap_snaps ready to flush */
428 spinlock_t snap_flush_lock;
429
430 u64 last_cap_flush_tid;
431 struct list_head cap_flush_list;
432 struct list_head cap_dirty_migrating; /* ...that are migration... */
433 int num_cap_flushing; /* # caps we are flushing */
434 spinlock_t cap_dirty_lock; /* protects above items */
435 wait_queue_head_t cap_flushing_wq;
436
437 struct work_struct cap_reclaim_work;
438 atomic_t cap_reclaim_pending;
439
440 /*
441 * Cap reservations
442 *
443 * Maintain a global pool of preallocated struct ceph_caps, referenced
444 * by struct ceph_caps_reservations. This ensures that we preallocate
445 * memory needed to successfully process an MDS response. (If an MDS
446 * sends us cap information and we fail to process it, we will have
447 * problems due to the client and MDS being out of sync.)
448 *
449 * Reservations are 'owned' by a ceph_cap_reservation context.
450 */
451 spinlock_t caps_list_lock;
452 struct list_head caps_list; /* unused (reserved or
453 unreserved) */
454 struct list_head cap_wait_list;
455 int caps_total_count; /* total caps allocated */
456 int caps_use_count; /* in use */
457 int caps_use_max; /* max used caps */
458 int caps_reserve_count; /* unused, reserved */
459 int caps_avail_count; /* unused, unreserved */
460 int caps_min_count; /* keep at least this many
461 (unreserved) */
462 spinlock_t dentry_list_lock;
463 struct list_head dentry_leases; /* fifo list */
464 struct list_head dentry_dir_leases; /* lru list */
465
466 struct ceph_client_metric metric;
467
468 spinlock_t snapid_map_lock;
469 struct rb_root snapid_map_tree;
470 struct list_head snapid_map_lru;
471
472 struct rw_semaphore pool_perm_rwsem;
473 struct rb_root pool_perm_tree;
474
475 char nodename[__NEW_UTS_LEN + 1];
476};
477
478extern const char *ceph_mds_op_name(int op);
479
480extern bool check_session_state(struct ceph_mds_session *s);
481void inc_session_sequence(struct ceph_mds_session *s);
482
483extern struct ceph_mds_session *
484__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
485
486extern const char *ceph_session_state_name(int s);
487
488extern struct ceph_mds_session *
489ceph_get_mds_session(struct ceph_mds_session *s);
490extern void ceph_put_mds_session(struct ceph_mds_session *s);
491
492extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
493 struct ceph_msg *msg, int mds);
494
495extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
496extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
497extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
498extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
499
500extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
501
502extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
503extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
504 struct inode *dir);
505extern struct ceph_mds_request *
506ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
507extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
508 struct inode *dir,
509 struct ceph_mds_request *req);
510extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
511 struct inode *dir,
512 struct ceph_mds_request *req);
513extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
514extern void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req);
515static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
516{
517 kref_get(&req->r_kref);
518}
519extern void ceph_mdsc_release_request(struct kref *kref);
520static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
521{
522 kref_put(&req->r_kref, ceph_mdsc_release_request);
523}
524
525extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
526 struct ceph_cap *cap);
527extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
528 struct ceph_mds_session *session);
529extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
530extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
531extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
532 int (*cb)(struct inode *,
533 struct ceph_cap *, void *),
534 void *arg);
535extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
536
537static inline void ceph_mdsc_free_path(char *path, int len)
538{
539 if (!IS_ERR_OR_NULL(path))
540 __putname(path - (PATH_MAX - 1 - len));
541}
542
543extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
544 int stop_on_nosnap);
545
546extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
547extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
548 struct dentry *dentry, char action,
549 u32 seq);
550
551extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
552 struct ceph_msg *msg);
553extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
554 struct ceph_msg *msg);
555
556extern struct ceph_mds_session *
557ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
558extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
559 struct ceph_mds_session *session);
560
561extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
562 struct ceph_mds_session *session,
563 int max_caps);
564
565static inline int ceph_wait_on_async_create(struct inode *inode)
566{
567 struct ceph_inode_info *ci = ceph_inode(inode);
568
569 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
570 TASK_INTERRUPTIBLE);
571}
572
573extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
574extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
575#endif