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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 
 15 /*
 16  * Some lock dependencies:
 17  *
 18  * session->s_mutex
 19  *         mdsc->mutex
 20  *
 21  *         mdsc->snap_rwsem
 22  *
 23  *         inode->i_lock
 24  *                 mdsc->snap_flush_lock
 25  *                 mdsc->cap_delay_lock
 26  *
 27  */
 28 
 29 struct ceph_fs_client;
 30 struct ceph_cap;
 31 
 32 /*
 33  * parsed info about a single inode.  pointers are into the encoded
 34  * on-wire structures within the mds reply message payload.
 35  */
 36 struct ceph_mds_reply_info_in {
 37         struct ceph_mds_reply_inode *in;
 38         struct ceph_dir_layout dir_layout;
 39         u32 symlink_len;
 40         char *symlink;
 41         u32 xattr_len;
 42         char *xattr_data;
 43 };
 44 
 45 /*
 46  * parsed info about an mds reply, including information about
 47  * either: 1) the target inode and/or its parent directory and dentry,
 48  * and directory contents (for readdir results), or
 49  * 2) the file range lock info (for fcntl F_GETLK results).
 50  */
 51 struct ceph_mds_reply_info_parsed {
 52         struct ceph_mds_reply_head    *head;
 53 
 54         /* trace */
 55         struct ceph_mds_reply_info_in diri, targeti;
 56         struct ceph_mds_reply_dirfrag *dirfrag;
 57         char                          *dname;
 58         u32                           dname_len;
 59         struct ceph_mds_reply_lease   *dlease;
 60 
 61         /* extra */
 62         union {
 63                 /* for fcntl F_GETLK results */
 64                 struct ceph_filelock *filelock_reply;
 65 
 66                 /* for readdir results */
 67                 struct {
 68                         struct ceph_mds_reply_dirfrag *dir_dir;
 69                         int                           dir_nr;
 70                         char                          **dir_dname;
 71                         u32                           *dir_dname_len;
 72                         struct ceph_mds_reply_lease   **dir_dlease;
 73                         struct ceph_mds_reply_info_in *dir_in;
 74                         u8                            dir_complete, dir_end;
 75                 };
 76         };
 77 
 78         /* encoded blob describing snapshot contexts for certain
 79            operations (e.g., open) */
 80         void *snapblob;
 81         int snapblob_len;
 82 };
 83 
 84 
 85 /*
 86  * cap releases are batched and sent to the MDS en masse.
 87  */
 88 #define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE -                       \
 89                                 sizeof(struct ceph_mds_cap_release)) /  \
 90                                sizeof(struct ceph_mds_cap_item))
 91 
 92 
 93 /*
 94  * state associated with each MDS<->client session
 95  */
 96 enum {
 97         CEPH_MDS_SESSION_NEW = 1,
 98         CEPH_MDS_SESSION_OPENING = 2,
 99         CEPH_MDS_SESSION_OPEN = 3,
100         CEPH_MDS_SESSION_HUNG = 4,
101         CEPH_MDS_SESSION_CLOSING = 5,
102         CEPH_MDS_SESSION_RESTARTING = 6,
103         CEPH_MDS_SESSION_RECONNECTING = 7,
104 };
105 
106 struct ceph_mds_session {
107         struct ceph_mds_client *s_mdsc;
108         int               s_mds;
109         int               s_state;
110         unsigned long     s_ttl;      /* time until mds kills us */
111         u64               s_seq;      /* incoming msg seq # */
112         struct mutex      s_mutex;    /* serialize session messages */
113 
114         struct ceph_connection s_con;
115 
116         struct ceph_authorizer *s_authorizer;
117         void             *s_authorizer_buf, *s_authorizer_reply_buf;
118         size_t            s_authorizer_buf_len, s_authorizer_reply_buf_len;
119 
120         /* protected by s_cap_lock */
121         spinlock_t        s_cap_lock;
122         u32               s_cap_gen;  /* inc each time we get mds stale msg */
123         unsigned long     s_cap_ttl;  /* when session caps expire */
124         struct list_head  s_caps;     /* all caps issued by this session */
125         int               s_nr_caps, s_trim_caps;
126         int               s_num_cap_releases;
127         struct list_head  s_cap_releases; /* waiting cap_release messages */
128         struct list_head  s_cap_releases_done; /* ready to send */
129         struct ceph_cap  *s_cap_iterator;
130 
131         /* protected by mutex */
132         struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
133         struct list_head  s_cap_snaps_flushing;
134         unsigned long     s_renew_requested; /* last time we sent a renew req */
135         u64               s_renew_seq;
136 
137         atomic_t          s_ref;
138         struct list_head  s_waiting;  /* waiting requests */
139         struct list_head  s_unsafe;   /* unsafe requests */
140 };
141 
142 /*
143  * modes of choosing which MDS to send a request to
144  */
145 enum {
146         USE_ANY_MDS,
147         USE_RANDOM_MDS,
148         USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
149 };
150 
151 struct ceph_mds_request;
152 struct ceph_mds_client;
153 
154 /*
155  * request completion callback
156  */
157 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
158                                              struct ceph_mds_request *req);
159 
160 /*
161  * an in-flight mds request
162  */
163 struct ceph_mds_request {
164         u64 r_tid;                   /* transaction id */
165         struct rb_node r_node;
166         struct ceph_mds_client *r_mdsc;
167 
168         int r_op;                    /* mds op code */
169 
170         /* operation on what? */
171         struct inode *r_inode;              /* arg1 */
172         struct dentry *r_dentry;            /* arg1 */
173         struct dentry *r_old_dentry;        /* arg2: rename from or link from */
174         char *r_path1, *r_path2;
175         struct ceph_vino r_ino1, r_ino2;
176 
177         struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
178         struct inode *r_target_inode;       /* resulting inode */
179 
180         struct mutex r_fill_mutex;
181 
182         union ceph_mds_request_args r_args;
183         int r_fmode;        /* file mode, if expecting cap */
184         uid_t r_uid;
185         gid_t r_gid;
186 
187         /* for choosing which mds to send this request to */
188         int r_direct_mode;
189         u32 r_direct_hash;      /* choose dir frag based on this dentry hash */
190         bool r_direct_is_hash;  /* true if r_direct_hash is valid */
191 
192         /* data payload is used for xattr ops */
193         struct page **r_pages;
194         int r_num_pages;
195         int r_data_len;
196 
197         /* what caps shall we drop? */
198         int r_inode_drop, r_inode_unless;
199         int r_dentry_drop, r_dentry_unless;
200         int r_old_dentry_drop, r_old_dentry_unless;
201         struct inode *r_old_inode;
202         int r_old_inode_drop, r_old_inode_unless;
203 
204         struct ceph_msg  *r_request;  /* original request */
205         int r_request_release_offset;
206         struct ceph_msg  *r_reply;
207         struct ceph_mds_reply_info_parsed r_reply_info;
208         int r_err;
209         bool r_aborted;
210 
211         unsigned long r_timeout;  /* optional.  jiffies */
212         unsigned long r_started;  /* start time to measure timeout against */
213         unsigned long r_request_started; /* start time for mds request only,
214                                             used to measure lease durations */
215 
216         /* link unsafe requests to parent directory, for fsync */
217         struct inode    *r_unsafe_dir;
218         struct list_head r_unsafe_dir_item;
219 
220         struct ceph_mds_session *r_session;
221 
222         int               r_attempts;   /* resend attempts */
223         int               r_num_fwd;    /* number of forward attempts */
224         int               r_resend_mds; /* mds to resend to next, if any*/
225         u32               r_sent_on_mseq; /* cap mseq request was sent at*/
226 
227         struct kref       r_kref;
228         struct list_head  r_wait;
229         struct completion r_completion;
230         struct completion r_safe_completion;
231         ceph_mds_request_callback_t r_callback;
232         struct list_head  r_unsafe_item;  /* per-session unsafe list item */
233         bool              r_got_unsafe, r_got_safe, r_got_result;
234 
235         bool              r_did_prepopulate;
236         u32               r_readdir_offset;
237 
238         struct ceph_cap_reservation r_caps_reservation;
239         int r_num_caps;
240 };
241 
242 /*
243  * mds client state
244  */
245 struct ceph_mds_client {
246         struct ceph_fs_client  *fsc;
247         struct mutex            mutex;         /* all nested structures */
248 
249         struct ceph_mdsmap      *mdsmap;
250         struct completion       safe_umount_waiters;
251         wait_queue_head_t       session_close_wq;
252         struct list_head        waiting_for_map;
253 
254         struct ceph_mds_session **sessions;    /* NULL for mds if no session */
255         int                     max_sessions;  /* len of s_mds_sessions */
256         int                     stopping;      /* true if shutting down */
257 
258         /*
259          * snap_rwsem will cover cap linkage into snaprealms, and
260          * realm snap contexts.  (later, we can do per-realm snap
261          * contexts locks..)  the empty list contains realms with no
262          * references (implying they contain no inodes with caps) that
263          * should be destroyed.
264          */
265         struct rw_semaphore     snap_rwsem;
266         struct rb_root          snap_realms;
267         struct list_head        snap_empty;
268         spinlock_t              snap_empty_lock;  /* protect snap_empty */
269 
270         u64                    last_tid;      /* most recent mds request */
271         struct rb_root         request_tree;  /* pending mds requests */
272         struct delayed_work    delayed_work;  /* delayed work */
273         unsigned long    last_renew_caps;  /* last time we renewed our caps */
274         struct list_head cap_delay_list;   /* caps with delayed release */
275         spinlock_t       cap_delay_lock;   /* protects cap_delay_list */
276         struct list_head snap_flush_list;  /* cap_snaps ready to flush */
277         spinlock_t       snap_flush_lock;
278 
279         u64               cap_flush_seq;
280         struct list_head  cap_dirty;        /* inodes with dirty caps */
281         int               num_cap_flushing; /* # caps we are flushing */
282         spinlock_t        cap_dirty_lock;   /* protects above items */
283         wait_queue_head_t cap_flushing_wq;
284 
285         /*
286          * Cap reservations
287          *
288          * Maintain a global pool of preallocated struct ceph_caps, referenced
289          * by struct ceph_caps_reservations.  This ensures that we preallocate
290          * memory needed to successfully process an MDS response.  (If an MDS
291          * sends us cap information and we fail to process it, we will have
292          * problems due to the client and MDS being out of sync.)
293          *
294          * Reservations are 'owned' by a ceph_cap_reservation context.
295          */
296         spinlock_t      caps_list_lock;
297         struct          list_head caps_list; /* unused (reserved or
298                                                 unreserved) */
299         int             caps_total_count;    /* total caps allocated */
300         int             caps_use_count;      /* in use */
301         int             caps_reserve_count;  /* unused, reserved */
302         int             caps_avail_count;    /* unused, unreserved */
303         int             caps_min_count;      /* keep at least this many
304                                                 (unreserved) */
305         spinlock_t        dentry_lru_lock;
306         struct list_head  dentry_lru;
307         int               num_dentry;
308 };
309 
310 extern const char *ceph_mds_op_name(int op);
311 
312 extern struct ceph_mds_session *
313 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
314 
315 static inline struct ceph_mds_session *
316 ceph_get_mds_session(struct ceph_mds_session *s)
317 {
318         atomic_inc(&s->s_ref);
319         return s;
320 }
321 
322 extern void ceph_put_mds_session(struct ceph_mds_session *s);
323 
324 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
325                              struct ceph_msg *msg, int mds);
326 
327 extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
328 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
329 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
330 
331 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
332 
333 extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
334                                     struct inode *inode,
335                                     struct dentry *dn, int mask);
336 
337 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
338 
339 extern struct ceph_mds_request *
340 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
341 extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
342                                      struct ceph_mds_request *req);
343 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
344                                 struct inode *dir,
345                                 struct ceph_mds_request *req);
346 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
347 {
348         kref_get(&req->r_kref);
349 }
350 extern void ceph_mdsc_release_request(struct kref *kref);
351 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
352 {
353         kref_put(&req->r_kref, ceph_mdsc_release_request);
354 }
355 
356 extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
357                                  struct ceph_mds_session *session);
358 extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
359                                    struct ceph_mds_session *session);
360 
361 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
362 
363 extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
364                                   int stop_on_nosnap);
365 
366 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
367 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
368                                      struct inode *inode,
369                                      struct dentry *dentry, char action,
370                                      u32 seq);
371 
372 extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
373                                  struct ceph_msg *msg);
374 
375 extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
376                                           struct ceph_mds_session *session);
377 
378 #endif
379 

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