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de57606c SW |
1 | #ifndef _FS_CEPH_SUPER_H |
2 | #define _FS_CEPH_SUPER_H | |
3 | ||
4 | #include "ceph_debug.h" | |
5 | ||
6 | #include <asm/unaligned.h> | |
7 | #include <linux/backing-dev.h> | |
8 | #include <linux/completion.h> | |
9 | #include <linux/exportfs.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/mempool.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/wait.h> | |
14 | ||
15 | #include "types.h" | |
16 | #include "messenger.h" | |
17 | #include "msgpool.h" | |
18 | #include "mon_client.h" | |
19 | #include "mds_client.h" | |
20 | #include "osd_client.h" | |
21 | #include "ceph_fs.h" | |
22 | ||
23 | /* f_type in struct statfs */ | |
24 | #define CEPH_SUPER_MAGIC 0x00c36400 | |
25 | ||
26 | /* large granularity for statfs utilization stats to facilitate | |
27 | * large volume sizes on 32-bit machines. */ | |
28 | #define CEPH_BLOCK_SHIFT 20 /* 1 MB */ | |
29 | #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) | |
30 | ||
31 | /* | |
32 | * mount options | |
33 | */ | |
34 | #define CEPH_OPT_FSID (1<<0) | |
35 | #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ | |
36 | #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ | |
37 | #define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */ | |
38 | #define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ | |
39 | #define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */ | |
40 | #define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ | |
41 | ||
42 | #define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES) | |
43 | ||
44 | #define ceph_set_opt(client, opt) \ | |
6b805185 | 45 | (client)->mount_args->flags |= CEPH_OPT_##opt; |
de57606c | 46 | #define ceph_test_opt(client, opt) \ |
6b805185 | 47 | (!!((client)->mount_args->flags & CEPH_OPT_##opt)) |
de57606c SW |
48 | |
49 | ||
de57606c SW |
50 | struct ceph_mount_args { |
51 | int sb_flags; | |
6b805185 SW |
52 | int num_mon; |
53 | struct ceph_entity_addr *mon_addr; | |
de57606c SW |
54 | int flags; |
55 | int mount_timeout; | |
56 | int caps_wanted_delay_min, caps_wanted_delay_max; | |
57 | struct ceph_fsid fsid; | |
58 | struct ceph_entity_addr my_addr; | |
59 | int wsize; | |
60 | int rsize; /* max readahead */ | |
61 | int max_readdir; /* max readdir size */ | |
2baba250 | 62 | int congestion_kb; /* max readdir size */ |
de57606c SW |
63 | int osd_timeout; |
64 | char *snapdir_name; /* default ".snap" */ | |
4e7a5dcd | 65 | char *name; |
de57606c SW |
66 | char *secret; |
67 | int cap_release_safety; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * defaults | |
72 | */ | |
73 | #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 | |
8fa97655 | 74 | #define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */ |
de57606c SW |
75 | |
76 | #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) | |
77 | #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) | |
78 | ||
79 | #define CEPH_SNAPDIRNAME_DEFAULT ".snap" | |
4e7a5dcd | 80 | #define CEPH_AUTH_NAME_DEFAULT "guest" |
de57606c SW |
81 | |
82 | /* | |
83 | * Delay telling the MDS we no longer want caps, in case we reopen | |
84 | * the file. Delay a minimum amount of time, even if we send a cap | |
85 | * message for some other reason. Otherwise, take the oppotunity to | |
86 | * update the mds to avoid sending another message later. | |
87 | */ | |
88 | #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ | |
89 | #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ | |
90 | ||
91 | ||
92 | /* mount state */ | |
93 | enum { | |
94 | CEPH_MOUNT_MOUNTING, | |
95 | CEPH_MOUNT_MOUNTED, | |
96 | CEPH_MOUNT_UNMOUNTING, | |
97 | CEPH_MOUNT_UNMOUNTED, | |
98 | CEPH_MOUNT_SHUTDOWN, | |
99 | }; | |
100 | ||
101 | /* | |
102 | * subtract jiffies | |
103 | */ | |
104 | static inline unsigned long time_sub(unsigned long a, unsigned long b) | |
105 | { | |
106 | BUG_ON(time_after(b, a)); | |
107 | return (long)a - (long)b; | |
108 | } | |
109 | ||
110 | /* | |
111 | * per-filesystem client state | |
112 | * | |
113 | * possibly shared by multiple mount points, if they are | |
114 | * mounting the same ceph filesystem/cluster. | |
115 | */ | |
116 | struct ceph_client { | |
0743304d SW |
117 | struct ceph_fsid fsid; |
118 | bool have_fsid; | |
de57606c SW |
119 | |
120 | struct mutex mount_mutex; /* serialize mount attempts */ | |
6b805185 | 121 | struct ceph_mount_args *mount_args; |
de57606c SW |
122 | |
123 | struct super_block *sb; | |
124 | ||
125 | unsigned long mount_state; | |
126 | wait_queue_head_t mount_wq; | |
127 | ||
128 | int mount_err; | |
de57606c SW |
129 | |
130 | struct ceph_messenger *msgr; /* messenger instance */ | |
131 | struct ceph_mon_client monc; | |
132 | struct ceph_mds_client mdsc; | |
133 | struct ceph_osd_client osdc; | |
134 | ||
135 | /* writeback */ | |
136 | mempool_t *wb_pagevec_pool; | |
137 | struct workqueue_struct *wb_wq; | |
138 | struct workqueue_struct *pg_inv_wq; | |
139 | struct workqueue_struct *trunc_wq; | |
2baba250 | 140 | atomic_long_t writeback_count; |
de57606c SW |
141 | |
142 | struct backing_dev_info backing_dev_info; | |
0743304d SW |
143 | |
144 | #ifdef CONFIG_DEBUG_FS | |
145 | struct dentry *debugfs_monmap; | |
146 | struct dentry *debugfs_mdsmap, *debugfs_osdmap; | |
147 | struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; | |
2baba250 | 148 | struct dentry *debugfs_congestion_kb; |
06edf046 | 149 | struct dentry *debugfs_bdi; |
0743304d | 150 | #endif |
de57606c SW |
151 | }; |
152 | ||
153 | static inline struct ceph_client *ceph_client(struct super_block *sb) | |
154 | { | |
155 | return sb->s_fs_info; | |
156 | } | |
157 | ||
158 | ||
159 | /* | |
160 | * File i/o capability. This tracks shared state with the metadata | |
161 | * server that allows us to cache or writeback attributes or to read | |
162 | * and write data. For any given inode, we should have one or more | |
163 | * capabilities, one issued by each metadata server, and our | |
164 | * cumulative access is the OR of all issued capabilities. | |
165 | * | |
166 | * Each cap is referenced by the inode's i_caps rbtree and by per-mds | |
167 | * session capability lists. | |
168 | */ | |
169 | struct ceph_cap { | |
170 | struct ceph_inode_info *ci; | |
171 | struct rb_node ci_node; /* per-ci cap tree */ | |
172 | struct ceph_mds_session *session; | |
173 | struct list_head session_caps; /* per-session caplist */ | |
174 | int mds; | |
175 | u64 cap_id; /* unique cap id (mds provided) */ | |
176 | int issued; /* latest, from the mds */ | |
177 | int implemented; /* implemented superset of issued (for revocation) */ | |
178 | int mds_wanted; | |
685f9a5d SW |
179 | u32 seq, issue_seq, mseq; |
180 | u32 cap_gen; /* active/stale cycle */ | |
de57606c SW |
181 | unsigned long last_used; |
182 | struct list_head caps_item; | |
183 | }; | |
184 | ||
185 | #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ | |
186 | #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ | |
187 | #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ | |
188 | ||
189 | /* | |
190 | * Snapped cap state that is pending flush to mds. When a snapshot occurs, | |
191 | * we first complete any in-process sync writes and writeback any dirty | |
192 | * data before flushing the snapped state (tracked here) back to the MDS. | |
193 | */ | |
194 | struct ceph_cap_snap { | |
195 | atomic_t nref; | |
196 | struct ceph_inode_info *ci; | |
197 | struct list_head ci_item, flushing_item; | |
198 | ||
199 | u64 follows, flush_tid; | |
200 | int issued, dirty; | |
201 | struct ceph_snap_context *context; | |
202 | ||
203 | mode_t mode; | |
204 | uid_t uid; | |
205 | gid_t gid; | |
206 | ||
207 | void *xattr_blob; | |
208 | int xattr_len; | |
209 | u64 xattr_version; | |
210 | ||
211 | u64 size; | |
212 | struct timespec mtime, atime, ctime; | |
213 | u64 time_warp_seq; | |
214 | int writing; /* a sync write is still in progress */ | |
215 | int dirty_pages; /* dirty pages awaiting writeback */ | |
216 | }; | |
217 | ||
218 | static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) | |
219 | { | |
220 | if (atomic_dec_and_test(&capsnap->nref)) | |
221 | kfree(capsnap); | |
222 | } | |
223 | ||
224 | /* | |
225 | * The frag tree describes how a directory is fragmented, potentially across | |
226 | * multiple metadata servers. It is also used to indicate points where | |
227 | * metadata authority is delegated, and whether/where metadata is replicated. | |
228 | * | |
229 | * A _leaf_ frag will be present in the i_fragtree IFF there is | |
230 | * delegation info. That is, if mds >= 0 || ndist > 0. | |
231 | */ | |
232 | #define CEPH_MAX_DIRFRAG_REP 4 | |
233 | ||
234 | struct ceph_inode_frag { | |
235 | struct rb_node node; | |
236 | ||
237 | /* fragtree state */ | |
238 | u32 frag; | |
239 | int split_by; /* i.e. 2^(split_by) children */ | |
240 | ||
241 | /* delegation and replication info */ | |
242 | int mds; /* -1 if same authority as parent */ | |
243 | int ndist; /* >0 if replicated */ | |
244 | int dist[CEPH_MAX_DIRFRAG_REP]; | |
245 | }; | |
246 | ||
247 | /* | |
248 | * We cache inode xattrs as an encoded blob until they are first used, | |
249 | * at which point we parse them into an rbtree. | |
250 | */ | |
251 | struct ceph_inode_xattr { | |
252 | struct rb_node node; | |
253 | ||
254 | const char *name; | |
255 | int name_len; | |
256 | const char *val; | |
257 | int val_len; | |
258 | int dirty; | |
259 | ||
260 | int should_free_name; | |
261 | int should_free_val; | |
262 | }; | |
263 | ||
264 | struct ceph_inode_xattrs_info { | |
265 | /* | |
266 | * (still encoded) xattr blob. we avoid the overhead of parsing | |
267 | * this until someone actually calls getxattr, etc. | |
268 | * | |
269 | * blob->vec.iov_len == 4 implies there are no xattrs; blob == | |
270 | * NULL means we don't know. | |
271 | */ | |
272 | struct ceph_buffer *blob, *prealloc_blob; | |
273 | ||
274 | struct rb_root index; | |
275 | bool dirty; | |
276 | int count; | |
277 | int names_size; | |
278 | int vals_size; | |
279 | u64 version, index_version; | |
280 | }; | |
281 | ||
282 | /* | |
283 | * Ceph inode. | |
284 | */ | |
285 | #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ | |
286 | #define CEPH_I_NODELAY 4 /* do not delay cap release */ | |
287 | #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ | |
288 | ||
289 | struct ceph_inode_info { | |
290 | struct ceph_vino i_vino; /* ceph ino + snap */ | |
291 | ||
292 | u64 i_version; | |
293 | u32 i_time_warp_seq; | |
294 | ||
295 | unsigned i_ceph_flags; | |
296 | unsigned long i_release_count; | |
297 | ||
298 | struct ceph_file_layout i_layout; | |
299 | char *i_symlink; | |
300 | ||
301 | /* for dirs */ | |
302 | struct timespec i_rctime; | |
303 | u64 i_rbytes, i_rfiles, i_rsubdirs; | |
304 | u64 i_files, i_subdirs; | |
305 | u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ | |
306 | ||
307 | struct rb_root i_fragtree; | |
308 | struct mutex i_fragtree_mutex; | |
309 | ||
310 | struct ceph_inode_xattrs_info i_xattrs; | |
311 | ||
312 | /* capabilities. protected _both_ by i_lock and cap->session's | |
313 | * s_mutex. */ | |
314 | struct rb_root i_caps; /* cap list */ | |
315 | struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ | |
316 | unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ | |
317 | struct list_head i_dirty_item, i_flushing_item; | |
318 | u64 i_cap_flush_seq; | |
319 | /* we need to track cap writeback on a per-cap-bit basis, to allow | |
320 | * overlapping, pipelined cap flushes to the mds. we can probably | |
321 | * reduce the tid to 8 bits if we're concerned about inode size. */ | |
322 | u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; | |
323 | wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ | |
324 | unsigned long i_hold_caps_min; /* jiffies */ | |
325 | unsigned long i_hold_caps_max; /* jiffies */ | |
326 | struct list_head i_cap_delay_list; /* for delayed cap release to mds */ | |
327 | int i_cap_exporting_mds; /* to handle cap migration between */ | |
328 | unsigned i_cap_exporting_mseq; /* mds's. */ | |
329 | unsigned i_cap_exporting_issued; | |
330 | struct ceph_cap_reservation i_cap_migration_resv; | |
331 | struct list_head i_cap_snaps; /* snapped state pending flush to mds */ | |
332 | struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */ | |
333 | unsigned i_snap_caps; /* cap bits for snapped files */ | |
334 | ||
335 | int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ | |
336 | ||
337 | u32 i_truncate_seq; /* last truncate to smaller size */ | |
338 | u64 i_truncate_size; /* and the size we last truncated down to */ | |
339 | int i_truncate_pending; /* still need to call vmtruncate */ | |
340 | ||
341 | u64 i_max_size; /* max file size authorized by mds */ | |
342 | u64 i_reported_size; /* (max_)size reported to or requested of mds */ | |
343 | u64 i_wanted_max_size; /* offset we'd like to write too */ | |
344 | u64 i_requested_max_size; /* max_size we've requested */ | |
345 | ||
346 | /* held references to caps */ | |
347 | int i_pin_ref; | |
348 | int i_rd_ref, i_rdcache_ref, i_wr_ref; | |
349 | int i_wrbuffer_ref, i_wrbuffer_ref_head; | |
350 | u32 i_shared_gen; /* increment each time we get FILE_SHARED */ | |
351 | u32 i_rdcache_gen; /* we increment this each time we get | |
352 | FILE_CACHE. If it's non-zero, we | |
353 | _may_ have cached pages. */ | |
354 | u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ | |
355 | ||
356 | struct list_head i_unsafe_writes; /* uncommitted sync writes */ | |
357 | struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ | |
358 | spinlock_t i_unsafe_lock; | |
359 | ||
360 | struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ | |
361 | int i_snap_realm_counter; /* snap realm (if caps) */ | |
362 | struct list_head i_snap_realm_item; | |
363 | struct list_head i_snap_flush_item; | |
364 | ||
365 | struct work_struct i_wb_work; /* writeback work */ | |
366 | struct work_struct i_pg_inv_work; /* page invalidation work */ | |
367 | ||
368 | struct work_struct i_vmtruncate_work; | |
369 | ||
370 | struct inode vfs_inode; /* at end */ | |
371 | }; | |
372 | ||
373 | static inline struct ceph_inode_info *ceph_inode(struct inode *inode) | |
374 | { | |
fbbccec9 | 375 | return container_of(inode, struct ceph_inode_info, vfs_inode); |
de57606c SW |
376 | } |
377 | ||
378 | static inline void ceph_i_clear(struct inode *inode, unsigned mask) | |
379 | { | |
380 | struct ceph_inode_info *ci = ceph_inode(inode); | |
381 | ||
382 | spin_lock(&inode->i_lock); | |
383 | ci->i_ceph_flags &= ~mask; | |
384 | spin_unlock(&inode->i_lock); | |
385 | } | |
386 | ||
387 | static inline void ceph_i_set(struct inode *inode, unsigned mask) | |
388 | { | |
389 | struct ceph_inode_info *ci = ceph_inode(inode); | |
390 | ||
391 | spin_lock(&inode->i_lock); | |
392 | ci->i_ceph_flags |= mask; | |
393 | spin_unlock(&inode->i_lock); | |
394 | } | |
395 | ||
396 | static inline bool ceph_i_test(struct inode *inode, unsigned mask) | |
397 | { | |
398 | struct ceph_inode_info *ci = ceph_inode(inode); | |
399 | bool r; | |
400 | ||
401 | smp_mb(); | |
402 | r = (ci->i_ceph_flags & mask) == mask; | |
403 | return r; | |
404 | } | |
405 | ||
406 | ||
407 | /* find a specific frag @f */ | |
408 | extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, | |
409 | u32 f); | |
410 | ||
411 | /* | |
412 | * choose fragment for value @v. copy frag content to pfrag, if leaf | |
413 | * exists | |
414 | */ | |
415 | extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, | |
416 | struct ceph_inode_frag *pfrag, | |
417 | int *found); | |
418 | ||
419 | /* | |
420 | * Ceph dentry state | |
421 | */ | |
422 | struct ceph_dentry_info { | |
423 | struct ceph_mds_session *lease_session; | |
424 | u32 lease_gen, lease_shared_gen; | |
425 | u32 lease_seq; | |
426 | unsigned long lease_renew_after, lease_renew_from; | |
427 | struct list_head lru; | |
428 | struct dentry *dentry; | |
429 | u64 time; | |
430 | u64 offset; | |
431 | }; | |
432 | ||
433 | static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) | |
434 | { | |
435 | return (struct ceph_dentry_info *)dentry->d_fsdata; | |
436 | } | |
437 | ||
438 | static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) | |
439 | { | |
440 | return ((loff_t)frag << 32) | (loff_t)off; | |
441 | } | |
442 | ||
443 | /* | |
444 | * ino_t is <64 bits on many architectures, blech. | |
445 | * | |
446 | * don't include snap in ino hash, at least for now. | |
447 | */ | |
448 | static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) | |
449 | { | |
450 | ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */ | |
451 | #if BITS_PER_LONG == 32 | |
452 | ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8; | |
453 | if (!ino) | |
454 | ino = 1; | |
455 | #endif | |
456 | return ino; | |
457 | } | |
458 | ||
459 | static inline int ceph_set_ino_cb(struct inode *inode, void *data) | |
460 | { | |
461 | ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; | |
462 | inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static inline struct ceph_vino ceph_vino(struct inode *inode) | |
467 | { | |
468 | return ceph_inode(inode)->i_vino; | |
469 | } | |
470 | ||
471 | /* for printf-style formatting */ | |
472 | #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap | |
473 | ||
474 | static inline u64 ceph_ino(struct inode *inode) | |
475 | { | |
476 | return ceph_inode(inode)->i_vino.ino; | |
477 | } | |
478 | static inline u64 ceph_snap(struct inode *inode) | |
479 | { | |
480 | return ceph_inode(inode)->i_vino.snap; | |
481 | } | |
482 | ||
483 | static inline int ceph_ino_compare(struct inode *inode, void *data) | |
484 | { | |
485 | struct ceph_vino *pvino = (struct ceph_vino *)data; | |
486 | struct ceph_inode_info *ci = ceph_inode(inode); | |
487 | return ci->i_vino.ino == pvino->ino && | |
488 | ci->i_vino.snap == pvino->snap; | |
489 | } | |
490 | ||
491 | static inline struct inode *ceph_find_inode(struct super_block *sb, | |
492 | struct ceph_vino vino) | |
493 | { | |
494 | ino_t t = ceph_vino_to_ino(vino); | |
495 | return ilookup5(sb, t, ceph_ino_compare, &vino); | |
496 | } | |
497 | ||
498 | ||
499 | /* | |
500 | * caps helpers | |
501 | */ | |
502 | static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) | |
503 | { | |
504 | return !RB_EMPTY_ROOT(&ci->i_caps); | |
505 | } | |
506 | ||
507 | extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); | |
508 | extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); | |
509 | extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, | |
510 | struct ceph_cap *cap); | |
511 | ||
512 | static inline int ceph_caps_issued(struct ceph_inode_info *ci) | |
513 | { | |
514 | int issued; | |
515 | spin_lock(&ci->vfs_inode.i_lock); | |
516 | issued = __ceph_caps_issued(ci, NULL); | |
517 | spin_unlock(&ci->vfs_inode.i_lock); | |
518 | return issued; | |
519 | } | |
520 | ||
521 | static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, | |
522 | int touch) | |
523 | { | |
524 | int r; | |
525 | spin_lock(&ci->vfs_inode.i_lock); | |
526 | r = __ceph_caps_issued_mask(ci, mask, touch); | |
527 | spin_unlock(&ci->vfs_inode.i_lock); | |
528 | return r; | |
529 | } | |
530 | ||
531 | static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) | |
532 | { | |
533 | return ci->i_dirty_caps | ci->i_flushing_caps; | |
534 | } | |
afcdaea3 | 535 | extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); |
de57606c SW |
536 | |
537 | extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); | |
538 | extern int __ceph_caps_used(struct ceph_inode_info *ci); | |
539 | ||
540 | extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); | |
541 | ||
542 | /* | |
543 | * wanted, by virtue of open file modes AND cap refs (buffered/cached data) | |
544 | */ | |
545 | static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) | |
546 | { | |
547 | int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); | |
548 | if (w & CEPH_CAP_FILE_BUFFER) | |
549 | w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ | |
550 | return w; | |
551 | } | |
552 | ||
553 | /* what the mds thinks we want */ | |
554 | extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); | |
555 | ||
556 | extern void ceph_caps_init(void); | |
557 | extern void ceph_caps_finalize(void); | |
558 | extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need); | |
559 | extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx); | |
560 | extern void ceph_reservation_status(struct ceph_client *client, | |
561 | int *total, int *avail, int *used, | |
562 | int *reserved); | |
563 | ||
564 | static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) | |
565 | { | |
566 | return (struct ceph_client *)inode->i_sb->s_fs_info; | |
567 | } | |
568 | ||
569 | static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) | |
570 | { | |
571 | return (struct ceph_client *)sb->s_fs_info; | |
572 | } | |
573 | ||
574 | static inline int ceph_queue_writeback(struct inode *inode) | |
575 | { | |
576 | return queue_work(ceph_inode_to_client(inode)->wb_wq, | |
577 | &ceph_inode(inode)->i_wb_work); | |
578 | } | |
579 | ||
580 | static inline int ceph_queue_page_invalidation(struct inode *inode) | |
581 | { | |
582 | return queue_work(ceph_inode_to_client(inode)->pg_inv_wq, | |
583 | &ceph_inode(inode)->i_pg_inv_work); | |
584 | } | |
585 | ||
586 | ||
587 | /* | |
588 | * we keep buffered readdir results attached to file->private_data | |
589 | */ | |
590 | struct ceph_file_info { | |
591 | int fmode; /* initialized on open */ | |
592 | ||
593 | /* readdir: position within the dir */ | |
594 | u32 frag; | |
595 | struct ceph_mds_request *last_readdir; | |
596 | int at_end; | |
597 | ||
598 | /* readdir: position within a frag */ | |
599 | unsigned offset; /* offset of last chunk, adjusted for . and .. */ | |
600 | u64 next_offset; /* offset of next chunk (last_name's + 1) */ | |
601 | char *last_name; /* last entry in previous chunk */ | |
602 | struct dentry *dentry; /* next dentry (for dcache readdir) */ | |
603 | unsigned long dir_release_count; | |
604 | ||
605 | /* used for -o dirstat read() on directory thing */ | |
606 | char *dir_info; | |
607 | int dir_info_len; | |
608 | }; | |
609 | ||
610 | ||
611 | ||
612 | /* | |
613 | * snapshots | |
614 | */ | |
615 | ||
616 | /* | |
617 | * A "snap context" is the set of existing snapshots when we | |
618 | * write data. It is used by the OSD to guide its COW behavior. | |
619 | * | |
620 | * The ceph_snap_context is refcounted, and attached to each dirty | |
621 | * page, indicating which context the dirty data belonged when it was | |
622 | * dirtied. | |
623 | */ | |
624 | struct ceph_snap_context { | |
625 | atomic_t nref; | |
626 | u64 seq; | |
627 | int num_snaps; | |
628 | u64 snaps[]; | |
629 | }; | |
630 | ||
631 | static inline struct ceph_snap_context * | |
632 | ceph_get_snap_context(struct ceph_snap_context *sc) | |
633 | { | |
634 | /* | |
635 | printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
636 | atomic_read(&sc->nref)+1); | |
637 | */ | |
638 | if (sc) | |
639 | atomic_inc(&sc->nref); | |
640 | return sc; | |
641 | } | |
642 | ||
643 | static inline void ceph_put_snap_context(struct ceph_snap_context *sc) | |
644 | { | |
645 | if (!sc) | |
646 | return; | |
647 | /* | |
648 | printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
649 | atomic_read(&sc->nref)-1); | |
650 | */ | |
651 | if (atomic_dec_and_test(&sc->nref)) { | |
652 | /*printk(" deleting snap_context %p\n", sc);*/ | |
653 | kfree(sc); | |
654 | } | |
655 | } | |
656 | ||
657 | /* | |
658 | * A "snap realm" describes a subset of the file hierarchy sharing | |
659 | * the same set of snapshots that apply to it. The realms themselves | |
660 | * are organized into a hierarchy, such that children inherit (some of) | |
661 | * the snapshots of their parents. | |
662 | * | |
663 | * All inodes within the realm that have capabilities are linked into a | |
664 | * per-realm list. | |
665 | */ | |
666 | struct ceph_snap_realm { | |
667 | u64 ino; | |
668 | atomic_t nref; | |
669 | u64 created, seq; | |
670 | u64 parent_ino; | |
671 | u64 parent_since; /* snapid when our current parent became so */ | |
672 | ||
673 | u64 *prior_parent_snaps; /* snaps inherited from any parents we */ | |
674 | int num_prior_parent_snaps; /* had prior to parent_since */ | |
675 | u64 *snaps; /* snaps specific to this realm */ | |
676 | int num_snaps; | |
677 | ||
678 | struct ceph_snap_realm *parent; | |
679 | struct list_head children; /* list of child realms */ | |
680 | struct list_head child_item; | |
681 | ||
682 | struct list_head empty_item; /* if i have ref==0 */ | |
683 | ||
684 | /* the current set of snaps for this realm */ | |
685 | struct ceph_snap_context *cached_context; | |
686 | ||
687 | struct list_head inodes_with_caps; | |
688 | spinlock_t inodes_with_caps_lock; | |
689 | }; | |
690 | ||
691 | ||
692 | ||
693 | /* | |
694 | * calculate the number of pages a given length and offset map onto, | |
695 | * if we align the data. | |
696 | */ | |
697 | static inline int calc_pages_for(u64 off, u64 len) | |
698 | { | |
699 | return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - | |
700 | (off >> PAGE_CACHE_SHIFT); | |
701 | } | |
702 | ||
703 | ||
704 | ||
705 | /* snap.c */ | |
706 | struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, | |
707 | u64 ino); | |
708 | extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, | |
709 | struct ceph_snap_realm *realm); | |
710 | extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, | |
711 | struct ceph_snap_realm *realm); | |
712 | extern int ceph_update_snap_trace(struct ceph_mds_client *m, | |
713 | void *p, void *e, bool deletion); | |
714 | extern void ceph_handle_snap(struct ceph_mds_client *mdsc, | |
715 | struct ceph_msg *msg); | |
716 | extern void ceph_queue_cap_snap(struct ceph_inode_info *ci, | |
717 | struct ceph_snap_context *snapc); | |
718 | extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, | |
719 | struct ceph_cap_snap *capsnap); | |
720 | extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); | |
721 | ||
722 | /* | |
723 | * a cap_snap is "pending" if it is still awaiting an in-progress | |
724 | * sync write (that may/may not still update size, mtime, etc.). | |
725 | */ | |
726 | static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) | |
727 | { | |
728 | return !list_empty(&ci->i_cap_snaps) && | |
729 | list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, | |
730 | ci_item)->writing; | |
731 | } | |
732 | ||
733 | ||
734 | /* super.c */ | |
735 | extern struct kmem_cache *ceph_inode_cachep; | |
736 | extern struct kmem_cache *ceph_cap_cachep; | |
737 | extern struct kmem_cache *ceph_dentry_cachep; | |
738 | extern struct kmem_cache *ceph_file_cachep; | |
739 | ||
740 | extern const char *ceph_msg_type_name(int type); | |
0743304d | 741 | extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); |
de57606c SW |
742 | |
743 | #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \ | |
744 | "%02x%02x%02x%02x%02x%02x" | |
745 | #define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \ | |
746 | (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \ | |
747 | (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \ | |
748 | (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15] | |
749 | ||
750 | /* inode.c */ | |
751 | extern const struct inode_operations ceph_file_iops; | |
752 | ||
753 | extern struct inode *ceph_alloc_inode(struct super_block *sb); | |
754 | extern void ceph_destroy_inode(struct inode *inode); | |
755 | ||
756 | extern struct inode *ceph_get_inode(struct super_block *sb, | |
757 | struct ceph_vino vino); | |
758 | extern struct inode *ceph_get_snapdir(struct inode *parent); | |
759 | extern int ceph_fill_file_size(struct inode *inode, int issued, | |
760 | u32 truncate_seq, u64 truncate_size, u64 size); | |
761 | extern void ceph_fill_file_time(struct inode *inode, int issued, | |
762 | u64 time_warp_seq, struct timespec *ctime, | |
763 | struct timespec *mtime, struct timespec *atime); | |
764 | extern int ceph_fill_trace(struct super_block *sb, | |
765 | struct ceph_mds_request *req, | |
766 | struct ceph_mds_session *session); | |
767 | extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, | |
768 | struct ceph_mds_session *session); | |
769 | ||
770 | extern int ceph_inode_holds_cap(struct inode *inode, int mask); | |
771 | ||
772 | extern int ceph_inode_set_size(struct inode *inode, loff_t size); | |
773 | extern void ceph_inode_writeback(struct work_struct *work); | |
774 | extern void ceph_vmtruncate_work(struct work_struct *work); | |
775 | extern void __ceph_do_pending_vmtruncate(struct inode *inode); | |
776 | extern void __ceph_queue_vmtruncate(struct inode *inode); | |
777 | ||
778 | extern int ceph_do_getattr(struct inode *inode, int mask); | |
779 | extern int ceph_permission(struct inode *inode, int mask); | |
780 | extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); | |
781 | extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
782 | struct kstat *stat); | |
783 | ||
784 | /* xattr.c */ | |
785 | extern int ceph_setxattr(struct dentry *, const char *, const void *, | |
786 | size_t, int); | |
787 | extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); | |
788 | extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); | |
789 | extern int ceph_removexattr(struct dentry *, const char *); | |
790 | extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); | |
791 | extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); | |
792 | ||
793 | /* caps.c */ | |
794 | extern const char *ceph_cap_string(int c); | |
795 | extern void ceph_handle_caps(struct ceph_mds_session *session, | |
796 | struct ceph_msg *msg); | |
797 | extern int ceph_add_cap(struct inode *inode, | |
798 | struct ceph_mds_session *session, u64 cap_id, | |
799 | int fmode, unsigned issued, unsigned wanted, | |
800 | unsigned cap, unsigned seq, u64 realmino, int flags, | |
801 | struct ceph_cap_reservation *caps_reservation); | |
802 | extern void __ceph_remove_cap(struct ceph_cap *cap, | |
803 | struct ceph_cap_reservation *ctx); | |
804 | static inline void ceph_remove_cap(struct ceph_cap *cap) | |
805 | { | |
806 | struct inode *inode = &cap->ci->vfs_inode; | |
807 | spin_lock(&inode->i_lock); | |
808 | __ceph_remove_cap(cap, NULL); | |
809 | spin_unlock(&inode->i_lock); | |
810 | } | |
811 | ||
812 | extern void ceph_queue_caps_release(struct inode *inode); | |
813 | extern int ceph_write_inode(struct inode *inode, int unused); | |
814 | extern int ceph_fsync(struct file *file, struct dentry *dentry, int datasync); | |
815 | extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, | |
816 | struct ceph_mds_session *session); | |
817 | extern int ceph_get_cap_mds(struct inode *inode); | |
818 | extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); | |
819 | extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); | |
820 | extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, | |
821 | struct ceph_snap_context *snapc); | |
822 | extern void __ceph_flush_snaps(struct ceph_inode_info *ci, | |
823 | struct ceph_mds_session **psession); | |
824 | extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, | |
825 | struct ceph_mds_session *session); | |
afcdaea3 SW |
826 | extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); |
827 | extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); | |
de57606c SW |
828 | |
829 | extern int ceph_encode_inode_release(void **p, struct inode *inode, | |
830 | int mds, int drop, int unless, int force); | |
831 | extern int ceph_encode_dentry_release(void **p, struct dentry *dn, | |
832 | int mds, int drop, int unless); | |
833 | ||
834 | extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, | |
835 | int *got, loff_t endoff); | |
836 | ||
837 | /* for counting open files by mode */ | |
838 | static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) | |
839 | { | |
840 | ci->i_nr_by_mode[mode]++; | |
841 | } | |
842 | extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); | |
843 | ||
844 | /* addr.c */ | |
845 | extern const struct address_space_operations ceph_aops; | |
846 | extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); | |
847 | ||
848 | /* file.c */ | |
849 | extern const struct file_operations ceph_file_fops; | |
850 | extern const struct address_space_operations ceph_aops; | |
851 | extern int ceph_open(struct inode *inode, struct file *file); | |
852 | extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, | |
853 | struct nameidata *nd, int mode, | |
854 | int locked_dir); | |
855 | extern int ceph_release(struct inode *inode, struct file *filp); | |
856 | extern void ceph_release_page_vector(struct page **pages, int num_pages); | |
857 | ||
858 | /* dir.c */ | |
859 | extern const struct file_operations ceph_dir_fops; | |
860 | extern const struct inode_operations ceph_dir_iops; | |
861 | extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, | |
862 | ceph_snapdir_dentry_ops; | |
863 | ||
864 | extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); | |
865 | extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
866 | struct dentry *dentry, int err); | |
867 | ||
868 | extern void ceph_dentry_lru_add(struct dentry *dn); | |
869 | extern void ceph_dentry_lru_touch(struct dentry *dn); | |
870 | extern void ceph_dentry_lru_del(struct dentry *dn); | |
871 | ||
872 | /* | |
873 | * our d_ops vary depending on whether the inode is live, | |
874 | * snapshotted (read-only), or a virtual ".snap" directory. | |
875 | */ | |
876 | int ceph_init_dentry(struct dentry *dentry); | |
877 | ||
878 | ||
879 | /* ioctl.c */ | |
880 | extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
881 | ||
882 | /* export.c */ | |
883 | extern const struct export_operations ceph_export_ops; | |
884 | ||
885 | /* debugfs.c */ | |
886 | extern int ceph_debugfs_init(void); | |
887 | extern void ceph_debugfs_cleanup(void); | |
888 | extern int ceph_debugfs_client_init(struct ceph_client *client); | |
889 | extern void ceph_debugfs_client_cleanup(struct ceph_client *client); | |
890 | ||
891 | static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) | |
892 | { | |
893 | if (dentry && dentry->d_parent) | |
894 | return dentry->d_parent->d_inode; | |
895 | ||
896 | return NULL; | |
897 | } | |
898 | ||
899 | #endif /* _FS_CEPH_SUPER_H */ |