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

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