Driver-core: Always create class directories for classses that support namespaces.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / mds_client.h
blob952410c60d093e7ba5c39ed630c6283664d90c5a
1 #ifndef _FS_CEPH_MDS_CLIENT_H
2 #define _FS_CEPH_MDS_CLIENT_H
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>
11 #include "types.h"
12 #include "messenger.h"
13 #include "mdsmap.h"
16 * Some lock dependencies:
18 * session->s_mutex
19 * mdsc->mutex
21 * mdsc->snap_rwsem
23 * inode->i_lock
24 * mdsc->snap_flush_lock
25 * mdsc->cap_delay_lock
29 struct ceph_client;
30 struct ceph_cap;
33 * parsed info about a single inode. pointers are into the encoded
34 * on-wire structures within the mds reply message payload.
36 struct ceph_mds_reply_info_in {
37 struct ceph_mds_reply_inode *in;
38 u32 symlink_len;
39 char *symlink;
40 u32 xattr_len;
41 char *xattr_data;
45 * parsed info about an mds reply, including information about the
46 * target inode and/or its parent directory and dentry, and directory
47 * contents (for readdir results).
49 struct ceph_mds_reply_info_parsed {
50 struct ceph_mds_reply_head *head;
52 struct ceph_mds_reply_info_in diri, targeti;
53 struct ceph_mds_reply_dirfrag *dirfrag;
54 char *dname;
55 u32 dname_len;
56 struct ceph_mds_reply_lease *dlease;
58 struct ceph_mds_reply_dirfrag *dir_dir;
59 int dir_nr;
60 char **dir_dname;
61 u32 *dir_dname_len;
62 struct ceph_mds_reply_lease **dir_dlease;
63 struct ceph_mds_reply_info_in *dir_in;
64 u8 dir_complete, dir_end;
66 /* encoded blob describing snapshot contexts for certain
67 operations (e.g., open) */
68 void *snapblob;
69 int snapblob_len;
74 * cap releases are batched and sent to the MDS en masse.
76 #define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \
77 sizeof(struct ceph_mds_cap_release)) / \
78 sizeof(struct ceph_mds_cap_item))
82 * state associated with each MDS<->client session
84 enum {
85 CEPH_MDS_SESSION_NEW = 1,
86 CEPH_MDS_SESSION_OPENING = 2,
87 CEPH_MDS_SESSION_OPEN = 3,
88 CEPH_MDS_SESSION_HUNG = 4,
89 CEPH_MDS_SESSION_CLOSING = 5,
90 CEPH_MDS_SESSION_RESTARTING = 6,
91 CEPH_MDS_SESSION_RECONNECTING = 7,
94 struct ceph_mds_session {
95 struct ceph_mds_client *s_mdsc;
96 int s_mds;
97 int s_state;
98 unsigned long s_ttl; /* time until mds kills us */
99 u64 s_seq; /* incoming msg seq # */
100 struct mutex s_mutex; /* serialize session messages */
102 struct ceph_connection s_con;
104 struct ceph_authorizer *s_authorizer;
105 void *s_authorizer_buf, *s_authorizer_reply_buf;
106 size_t s_authorizer_buf_len, s_authorizer_reply_buf_len;
108 /* protected by s_cap_lock */
109 spinlock_t s_cap_lock;
110 u32 s_cap_gen; /* inc each time we get mds stale msg */
111 unsigned long s_cap_ttl; /* when session caps expire */
112 struct list_head s_caps; /* all caps issued by this session */
113 int s_nr_caps, s_trim_caps;
114 int s_num_cap_releases;
115 struct list_head s_cap_releases; /* waiting cap_release messages */
116 struct list_head s_cap_releases_done; /* ready to send */
117 struct ceph_cap *s_cap_iterator;
119 /* protected by mutex */
120 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
121 struct list_head s_cap_snaps_flushing;
122 unsigned long s_renew_requested; /* last time we sent a renew req */
123 u64 s_renew_seq;
125 atomic_t s_ref;
126 struct list_head s_waiting; /* waiting requests */
127 struct list_head s_unsafe; /* unsafe requests */
131 * modes of choosing which MDS to send a request to
133 enum {
134 USE_ANY_MDS,
135 USE_RANDOM_MDS,
136 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
139 struct ceph_mds_request;
140 struct ceph_mds_client;
143 * request completion callback
145 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
146 struct ceph_mds_request *req);
149 * an in-flight mds request
151 struct ceph_mds_request {
152 u64 r_tid; /* transaction id */
153 struct rb_node r_node;
155 int r_op; /* mds op code */
156 int r_mds;
158 /* operation on what? */
159 struct inode *r_inode; /* arg1 */
160 struct dentry *r_dentry; /* arg1 */
161 struct dentry *r_old_dentry; /* arg2: rename from or link from */
162 char *r_path1, *r_path2;
163 struct ceph_vino r_ino1, r_ino2;
165 struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
166 struct inode *r_target_inode; /* resulting inode */
168 struct mutex r_fill_mutex;
170 union ceph_mds_request_args r_args;
171 int r_fmode; /* file mode, if expecting cap */
173 /* for choosing which mds to send this request to */
174 int r_direct_mode;
175 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
176 bool r_direct_is_hash; /* true if r_direct_hash is valid */
178 /* data payload is used for xattr ops */
179 struct page **r_pages;
180 int r_num_pages;
181 int r_data_len;
183 /* what caps shall we drop? */
184 int r_inode_drop, r_inode_unless;
185 int r_dentry_drop, r_dentry_unless;
186 int r_old_dentry_drop, r_old_dentry_unless;
187 struct inode *r_old_inode;
188 int r_old_inode_drop, r_old_inode_unless;
190 struct ceph_msg *r_request; /* original request */
191 int r_request_release_offset;
192 struct ceph_msg *r_reply;
193 struct ceph_mds_reply_info_parsed r_reply_info;
194 int r_err;
195 bool r_aborted;
197 unsigned long r_timeout; /* optional. jiffies */
198 unsigned long r_started; /* start time to measure timeout against */
199 unsigned long r_request_started; /* start time for mds request only,
200 used to measure lease durations */
202 /* link unsafe requests to parent directory, for fsync */
203 struct inode *r_unsafe_dir;
204 struct list_head r_unsafe_dir_item;
206 struct ceph_mds_session *r_session;
208 int r_attempts; /* resend attempts */
209 int r_num_fwd; /* number of forward attempts */
210 int r_num_stale;
211 int r_resend_mds; /* mds to resend to next, if any*/
213 struct kref r_kref;
214 struct list_head r_wait;
215 struct completion r_completion;
216 struct completion r_safe_completion;
217 ceph_mds_request_callback_t r_callback;
218 struct list_head r_unsafe_item; /* per-session unsafe list item */
219 bool r_got_unsafe, r_got_safe, r_got_result;
221 bool r_did_prepopulate;
222 u32 r_readdir_offset;
224 struct ceph_cap_reservation r_caps_reservation;
225 int r_num_caps;
229 * mds client state
231 struct ceph_mds_client {
232 struct ceph_client *client;
233 struct mutex mutex; /* all nested structures */
235 struct ceph_mdsmap *mdsmap;
236 struct completion safe_umount_waiters, session_close_waiters;
237 struct list_head waiting_for_map;
239 struct ceph_mds_session **sessions; /* NULL for mds if no session */
240 int max_sessions; /* len of s_mds_sessions */
241 int stopping; /* true if shutting down */
244 * snap_rwsem will cover cap linkage into snaprealms, and
245 * realm snap contexts. (later, we can do per-realm snap
246 * contexts locks..) the empty list contains realms with no
247 * references (implying they contain no inodes with caps) that
248 * should be destroyed.
250 struct rw_semaphore snap_rwsem;
251 struct rb_root snap_realms;
252 struct list_head snap_empty;
253 spinlock_t snap_empty_lock; /* protect snap_empty */
255 u64 last_tid; /* most recent mds request */
256 struct rb_root request_tree; /* pending mds requests */
257 struct delayed_work delayed_work; /* delayed work */
258 unsigned long last_renew_caps; /* last time we renewed our caps */
259 struct list_head cap_delay_list; /* caps with delayed release */
260 spinlock_t cap_delay_lock; /* protects cap_delay_list */
261 struct list_head snap_flush_list; /* cap_snaps ready to flush */
262 spinlock_t snap_flush_lock;
264 u64 cap_flush_seq;
265 struct list_head cap_dirty; /* inodes with dirty caps */
266 int num_cap_flushing; /* # caps we are flushing */
267 spinlock_t cap_dirty_lock; /* protects above items */
268 wait_queue_head_t cap_flushing_wq;
270 #ifdef CONFIG_DEBUG_FS
271 struct dentry *debugfs_file;
272 #endif
274 spinlock_t dentry_lru_lock;
275 struct list_head dentry_lru;
276 int num_dentry;
279 extern const char *ceph_mds_op_name(int op);
281 extern struct ceph_mds_session *
282 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
284 static inline struct ceph_mds_session *
285 ceph_get_mds_session(struct ceph_mds_session *s)
287 atomic_inc(&s->s_ref);
288 return s;
291 extern void ceph_put_mds_session(struct ceph_mds_session *s);
293 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
294 struct ceph_msg *msg, int mds);
296 extern int ceph_mdsc_init(struct ceph_mds_client *mdsc,
297 struct ceph_client *client);
298 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
299 extern void ceph_mdsc_stop(struct ceph_mds_client *mdsc);
301 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
303 extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
304 struct inode *inode,
305 struct dentry *dn, int mask);
307 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
309 extern struct ceph_mds_request *
310 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
311 extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
312 struct ceph_mds_request *req);
313 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
314 struct inode *dir,
315 struct ceph_mds_request *req);
316 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
318 kref_get(&req->r_kref);
320 extern void ceph_mdsc_release_request(struct kref *kref);
321 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
323 kref_put(&req->r_kref, ceph_mdsc_release_request);
326 extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
327 struct ceph_mds_session *session,
328 int extra);
329 extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
330 struct ceph_mds_session *session);
332 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
334 extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
335 int stop_on_nosnap);
337 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
338 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
339 struct inode *inode,
340 struct dentry *dentry, char action,
341 u32 seq);
343 extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
344 struct ceph_msg *msg);
346 #endif