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

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