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TOMOYO Linux Cross Reference
Linux/fs/ceph/mds_client.h

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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 
 30 struct ceph_fs_client;
 31 struct ceph_cap;
 32 
 33 /*
 34  * parsed info about a single inode.  pointers are into the encoded
 35  * on-wire structures within the mds reply message payload.
 36  */
 37 struct ceph_mds_reply_info_in {
 38         struct ceph_mds_reply_inode *in;
 39         struct ceph_dir_layout dir_layout;
 40         u32 symlink_len;
 41         char *symlink;
 42         u32 xattr_len;
 43         char *xattr_data;
 44         u64 inline_version;
 45         u32 inline_len;
 46         char *inline_data;
 47 };
 48 
 49 /*
 50  * parsed info about an mds reply, including information about
 51  * either: 1) the target inode and/or its parent directory and dentry,
 52  * and directory contents (for readdir results), or
 53  * 2) the file range lock info (for fcntl F_GETLK results).
 54  */
 55 struct ceph_mds_reply_info_parsed {
 56         struct ceph_mds_reply_head    *head;
 57 
 58         /* trace */
 59         struct ceph_mds_reply_info_in diri, targeti;
 60         struct ceph_mds_reply_dirfrag *dirfrag;
 61         char                          *dname;
 62         u32                           dname_len;
 63         struct ceph_mds_reply_lease   *dlease;
 64 
 65         /* extra */
 66         union {
 67                 /* for fcntl F_GETLK results */
 68                 struct ceph_filelock *filelock_reply;
 69 
 70                 /* for readdir results */
 71                 struct {
 72                         struct ceph_mds_reply_dirfrag *dir_dir;
 73                         size_t                        dir_buf_size;
 74                         int                           dir_nr;
 75                         char                          **dir_dname;
 76                         u32                           *dir_dname_len;
 77                         struct ceph_mds_reply_lease   **dir_dlease;
 78                         struct ceph_mds_reply_info_in *dir_in;
 79                         u8                            dir_complete, dir_end;
 80                 };
 81 
 82                 /* for create results */
 83                 struct {
 84                         bool has_create_ino;
 85                         u64 ino;
 86                 };
 87         };
 88 
 89         /* encoded blob describing snapshot contexts for certain
 90            operations (e.g., open) */
 91         void *snapblob;
 92         int snapblob_len;
 93 };
 94 
 95 
 96 /*
 97  * cap releases are batched and sent to the MDS en masse.
 98  */
 99 #define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE -                       \
100                                 sizeof(struct ceph_mds_cap_release)) /  \
101                                sizeof(struct ceph_mds_cap_item))
102 
103 
104 /*
105  * state associated with each MDS<->client session
106  */
107 enum {
108         CEPH_MDS_SESSION_NEW = 1,
109         CEPH_MDS_SESSION_OPENING = 2,
110         CEPH_MDS_SESSION_OPEN = 3,
111         CEPH_MDS_SESSION_HUNG = 4,
112         CEPH_MDS_SESSION_CLOSING = 5,
113         CEPH_MDS_SESSION_RESTARTING = 6,
114         CEPH_MDS_SESSION_RECONNECTING = 7,
115 };
116 
117 struct ceph_mds_session {
118         struct ceph_mds_client *s_mdsc;
119         int               s_mds;
120         int               s_state;
121         unsigned long     s_ttl;      /* time until mds kills us */
122         u64               s_seq;      /* incoming msg seq # */
123         struct mutex      s_mutex;    /* serialize session messages */
124 
125         struct ceph_connection s_con;
126 
127         struct ceph_auth_handshake s_auth;
128 
129         /* protected by s_gen_ttl_lock */
130         spinlock_t        s_gen_ttl_lock;
131         u32               s_cap_gen;  /* inc each time we get mds stale msg */
132         unsigned long     s_cap_ttl;  /* when session caps expire */
133 
134         /* protected by s_cap_lock */
135         spinlock_t        s_cap_lock;
136         struct list_head  s_caps;     /* all caps issued by this session */
137         int               s_nr_caps, s_trim_caps;
138         int               s_num_cap_releases;
139         int               s_cap_reconnect;
140         int               s_readonly;
141         struct list_head  s_cap_releases; /* waiting cap_release messages */
142         struct ceph_cap  *s_cap_iterator;
143 
144         /* protected by mutex */
145         struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
146         struct list_head  s_cap_snaps_flushing;
147         unsigned long     s_renew_requested; /* last time we sent a renew req */
148         u64               s_renew_seq;
149 
150         atomic_t          s_ref;
151         struct list_head  s_waiting;  /* waiting requests */
152         struct list_head  s_unsafe;   /* unsafe requests */
153 };
154 
155 /*
156  * modes of choosing which MDS to send a request to
157  */
158 enum {
159         USE_ANY_MDS,
160         USE_RANDOM_MDS,
161         USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
162 };
163 
164 struct ceph_mds_request;
165 struct ceph_mds_client;
166 
167 /*
168  * request completion callback
169  */
170 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
171                                              struct ceph_mds_request *req);
172 /*
173  * wait for request completion callback
174  */
175 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
176                                                  struct ceph_mds_request *req);
177 
178 /*
179  * an in-flight mds request
180  */
181 struct ceph_mds_request {
182         u64 r_tid;                   /* transaction id */
183         struct rb_node r_node;
184         struct ceph_mds_client *r_mdsc;
185 
186         int r_op;                    /* mds op code */
187 
188         /* operation on what? */
189         struct inode *r_inode;              /* arg1 */
190         struct dentry *r_dentry;            /* arg1 */
191         struct dentry *r_old_dentry;        /* arg2: rename from or link from */
192         struct inode *r_old_dentry_dir;     /* arg2: old dentry's parent dir */
193         char *r_path1, *r_path2;
194         struct ceph_vino r_ino1, r_ino2;
195 
196         struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
197         struct inode *r_target_inode;       /* resulting inode */
198 
199         struct mutex r_fill_mutex;
200 
201         union ceph_mds_request_args r_args;
202         int r_fmode;        /* file mode, if expecting cap */
203         kuid_t r_uid;
204         kgid_t r_gid;
205         struct timespec r_stamp;
206 
207         /* for choosing which mds to send this request to */
208         int r_direct_mode;
209         u32 r_direct_hash;      /* choose dir frag based on this dentry hash */
210         bool r_direct_is_hash;  /* true if r_direct_hash is valid */
211 
212         /* data payload is used for xattr ops */
213         struct ceph_pagelist *r_pagelist;
214 
215         /* what caps shall we drop? */
216         int r_inode_drop, r_inode_unless;
217         int r_dentry_drop, r_dentry_unless;
218         int r_old_dentry_drop, r_old_dentry_unless;
219         struct inode *r_old_inode;
220         int r_old_inode_drop, r_old_inode_unless;
221 
222         struct ceph_msg  *r_request;  /* original request */
223         int r_request_release_offset;
224         struct ceph_msg  *r_reply;
225         struct ceph_mds_reply_info_parsed r_reply_info;
226         struct page *r_locked_page;
227         int r_err;
228         bool r_aborted;
229 
230         unsigned long r_timeout;  /* optional.  jiffies, 0 is "wait forever" */
231         unsigned long r_started;  /* start time to measure timeout against */
232         unsigned long r_request_started; /* start time for mds request only,
233                                             used to measure lease durations */
234 
235         /* link unsafe requests to parent directory, for fsync */
236         struct inode    *r_unsafe_dir;
237         struct list_head r_unsafe_dir_item;
238 
239         struct ceph_mds_session *r_session;
240 
241         int               r_attempts;   /* resend attempts */
242         int               r_num_fwd;    /* number of forward attempts */
243         int               r_resend_mds; /* mds to resend to next, if any*/
244         u32               r_sent_on_mseq; /* cap mseq request was sent at*/
245 
246         struct kref       r_kref;
247         struct list_head  r_wait;
248         struct completion r_completion;
249         struct completion r_safe_completion;
250         ceph_mds_request_callback_t r_callback;
251         ceph_mds_request_wait_callback_t r_wait_for_completion;
252         struct list_head  r_unsafe_item;  /* per-session unsafe list item */
253         bool              r_got_unsafe, r_got_safe, r_got_result;
254 
255         bool              r_did_prepopulate;
256         long long         r_dir_release_cnt;
257         long long         r_dir_ordered_cnt;
258         int               r_readdir_cache_idx;
259         u32               r_readdir_offset;
260 
261         struct ceph_cap_reservation r_caps_reservation;
262         int r_num_caps;
263 };
264 
265 struct ceph_pool_perm {
266         struct rb_node node;
267         u32 pool;
268         int perm;
269 };
270 
271 /*
272  * mds client state
273  */
274 struct ceph_mds_client {
275         struct ceph_fs_client  *fsc;
276         struct mutex            mutex;         /* all nested structures */
277 
278         struct ceph_mdsmap      *mdsmap;
279         struct completion       safe_umount_waiters;
280         wait_queue_head_t       session_close_wq;
281         struct list_head        waiting_for_map;
282 
283         struct ceph_mds_session **sessions;    /* NULL for mds if no session */
284         atomic_t                num_sessions;
285         int                     max_sessions;  /* len of s_mds_sessions */
286         int                     stopping;      /* true if shutting down */
287 
288         /*
289          * snap_rwsem will cover cap linkage into snaprealms, and
290          * realm snap contexts.  (later, we can do per-realm snap
291          * contexts locks..)  the empty list contains realms with no
292          * references (implying they contain no inodes with caps) that
293          * should be destroyed.
294          */
295         u64                     last_snap_seq;
296         struct rw_semaphore     snap_rwsem;
297         struct rb_root          snap_realms;
298         struct list_head        snap_empty;
299         spinlock_t              snap_empty_lock;  /* protect snap_empty */
300 
301         u64                    last_tid;      /* most recent mds request */
302         u64                    oldest_tid;    /* oldest incomplete mds request,
303                                                  excluding setfilelock requests */
304         struct rb_root         request_tree;  /* pending mds requests */
305         struct delayed_work    delayed_work;  /* delayed work */
306         unsigned long    last_renew_caps;  /* last time we renewed our caps */
307         struct list_head cap_delay_list;   /* caps with delayed release */
308         spinlock_t       cap_delay_lock;   /* protects cap_delay_list */
309         struct list_head snap_flush_list;  /* cap_snaps ready to flush */
310         spinlock_t       snap_flush_lock;
311 
312         u64               last_cap_flush_tid;
313         struct rb_root    cap_flush_tree;
314         struct list_head  cap_dirty;        /* inodes with dirty caps */
315         struct list_head  cap_dirty_migrating; /* ...that are migration... */
316         int               num_cap_flushing; /* # caps we are flushing */
317         spinlock_t        cap_dirty_lock;   /* protects above items */
318         wait_queue_head_t cap_flushing_wq;
319 
320         /*
321          * Cap reservations
322          *
323          * Maintain a global pool of preallocated struct ceph_caps, referenced
324          * by struct ceph_caps_reservations.  This ensures that we preallocate
325          * memory needed to successfully process an MDS response.  (If an MDS
326          * sends us cap information and we fail to process it, we will have
327          * problems due to the client and MDS being out of sync.)
328          *
329          * Reservations are 'owned' by a ceph_cap_reservation context.
330          */
331         spinlock_t      caps_list_lock;
332         struct          list_head caps_list; /* unused (reserved or
333                                                 unreserved) */
334         int             caps_total_count;    /* total caps allocated */
335         int             caps_use_count;      /* in use */
336         int             caps_reserve_count;  /* unused, reserved */
337         int             caps_avail_count;    /* unused, unreserved */
338         int             caps_min_count;      /* keep at least this many
339                                                 (unreserved) */
340         spinlock_t        dentry_lru_lock;
341         struct list_head  dentry_lru;
342         int               num_dentry;
343 
344         struct rw_semaphore     pool_perm_rwsem;
345         struct rb_root          pool_perm_tree;
346 };
347 
348 extern const char *ceph_mds_op_name(int op);
349 
350 extern struct ceph_mds_session *
351 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
352 
353 static inline struct ceph_mds_session *
354 ceph_get_mds_session(struct ceph_mds_session *s)
355 {
356         atomic_inc(&s->s_ref);
357         return s;
358 }
359 
360 extern const char *ceph_session_state_name(int s);
361 
362 extern void ceph_put_mds_session(struct ceph_mds_session *s);
363 
364 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
365                              struct ceph_msg *msg, int mds);
366 
367 extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
368 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
369 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
370 
371 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
372 
373 extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
374                                     struct inode *inode,
375                                     struct dentry *dn);
376 
377 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
378 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
379                                            struct inode *dir);
380 extern struct ceph_mds_request *
381 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
382 extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
383                                      struct ceph_mds_request *req);
384 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
385                                 struct inode *dir,
386                                 struct ceph_mds_request *req);
387 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
388 {
389         kref_get(&req->r_kref);
390 }
391 extern void ceph_mdsc_release_request(struct kref *kref);
392 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
393 {
394         kref_put(&req->r_kref, ceph_mdsc_release_request);
395 }
396 
397 extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
398                                    struct ceph_mds_session *session);
399 
400 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
401 
402 extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
403                                   int stop_on_nosnap);
404 
405 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
406 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
407                                      struct inode *inode,
408                                      struct dentry *dentry, char action,
409                                      u32 seq);
410 
411 extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
412                                  struct ceph_msg *msg);
413 
414 extern struct ceph_mds_session *
415 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
416 extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
417                                           struct ceph_mds_session *session);
418 
419 #endif
420 

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