1 #ifndef _FS_CEPH_SUPER_H
2 #define _FS_CEPH_SUPER_H
3
4 #include <linux/ceph/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 #include <linux/writeback.h>
15 #include <linux/slab.h>
16
17 #include <linux/ceph/libceph.h>
18
19 /* f_type in struct statfs */
20 #define CEPH_SUPER_MAGIC 0x00c36400
21
22 /* large granularity for statfs utilization stats to facilitate
23 * large volume sizes on 32-bit machines. */
24 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */
25 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
26
27 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */
28 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
29 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
30 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */
31 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */
32
33 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES)
34
35 #define ceph_set_mount_opt(fsc, opt) \
36 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
37 #define ceph_test_mount_opt(fsc, opt) \
38 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
39
40 #define CEPH_RSIZE_DEFAULT 0 /* max read size */
41 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */
42 #define CEPH_MAX_READDIR_DEFAULT 1024
43 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
44 #define CEPH_SNAPDIRNAME_DEFAULT ".snap"
45
46 struct ceph_mount_options {
47 int flags;
48 int sb_flags;
49
50 int wsize; /* max write size */
51 int rsize; /* max read size */
52 int rasize; /* max readahead */
53 int congestion_kb; /* max writeback in flight */
54 int caps_wanted_delay_min, caps_wanted_delay_max;
55 int cap_release_safety;
56 int max_readdir; /* max readdir result (entires) */
57 int max_readdir_bytes; /* max readdir result (bytes) */
58
59 /*
60 * everything above this point can be memcmp'd; everything below
61 * is handled in compare_mount_options()
62 */
63
64 char *snapdir_name; /* default ".snap" */
65 };
66
67 struct ceph_fs_client {
68 struct super_block *sb;
69
70 struct ceph_mount_options *mount_options;
71 struct ceph_client *client;
72
73 unsigned long mount_state;
74 int min_caps; /* min caps i added */
75
76 struct ceph_mds_client *mdsc;
77
78 /* writeback */
79 mempool_t *wb_pagevec_pool;
80 struct workqueue_struct *wb_wq;
81 struct workqueue_struct *pg_inv_wq;
82 struct workqueue_struct *trunc_wq;
83 atomic_long_t writeback_count;
84
85 struct backing_dev_info backing_dev_info;
86
87 #ifdef CONFIG_DEBUG_FS
88 struct dentry *debugfs_dentry_lru, *debugfs_caps;
89 struct dentry *debugfs_congestion_kb;
90 struct dentry *debugfs_bdi;
91 struct dentry *debugfs_mdsc, *debugfs_mdsmap;
92 #endif
93 };
94
95
96 /*
97 * File i/o capability. This tracks shared state with the metadata
98 * server that allows us to cache or writeback attributes or to read
99 * and write data. For any given inode, we should have one or more
100 * capabilities, one issued by each metadata server, and our
101 * cumulative access is the OR of all issued capabilities.
102 *
103 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
104 * session capability lists.
105 */
106 struct ceph_cap {
107 struct ceph_inode_info *ci;
108 struct rb_node ci_node; /* per-ci cap tree */
109 struct ceph_mds_session *session;
110 struct list_head session_caps; /* per-session caplist */
111 int mds;
112 u64 cap_id; /* unique cap id (mds provided) */
113 int issued; /* latest, from the mds */
114 int implemented; /* implemented superset of issued (for revocation) */
115 int mds_wanted;
116 u32 seq, issue_seq, mseq;
117 u32 cap_gen; /* active/stale cycle */
118 unsigned long last_used;
119 struct list_head caps_item;
120 };
121
122 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */
123 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
124 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
125
126 /*
127 * Snapped cap state that is pending flush to mds. When a snapshot occurs,
128 * we first complete any in-process sync writes and writeback any dirty
129 * data before flushing the snapped state (tracked here) back to the MDS.
130 */
131 struct ceph_cap_snap {
132 atomic_t nref;
133 struct ceph_inode_info *ci;
134 struct list_head ci_item, flushing_item;
135
136 u64 follows, flush_tid;
137 int issued, dirty;
138 struct ceph_snap_context *context;
139
140 umode_t mode;
141 uid_t uid;
142 gid_t gid;
143
144 struct ceph_buffer *xattr_blob;
145 u64 xattr_version;
146
147 u64 size;
148 struct timespec mtime, atime, ctime;
149 u64 time_warp_seq;
150 int writing; /* a sync write is still in progress */
151 int dirty_pages; /* dirty pages awaiting writeback */
152 };
153
ceph_put_cap_snap(struct ceph_cap_snap * capsnap)154 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
155 {
156 if (atomic_dec_and_test(&capsnap->nref)) {
157 if (capsnap->xattr_blob)
158 ceph_buffer_put(capsnap->xattr_blob);
159 kfree(capsnap);
160 }
161 }
162
163 /*
164 * The frag tree describes how a directory is fragmented, potentially across
165 * multiple metadata servers. It is also used to indicate points where
166 * metadata authority is delegated, and whether/where metadata is replicated.
167 *
168 * A _leaf_ frag will be present in the i_fragtree IFF there is
169 * delegation info. That is, if mds >= 0 || ndist > 0.
170 */
171 #define CEPH_MAX_DIRFRAG_REP 4
172
173 struct ceph_inode_frag {
174 struct rb_node node;
175
176 /* fragtree state */
177 u32 frag;
178 int split_by; /* i.e. 2^(split_by) children */
179
180 /* delegation and replication info */
181 int mds; /* -1 if same authority as parent */
182 int ndist; /* >0 if replicated */
183 int dist[CEPH_MAX_DIRFRAG_REP];
184 };
185
186 /*
187 * We cache inode xattrs as an encoded blob until they are first used,
188 * at which point we parse them into an rbtree.
189 */
190 struct ceph_inode_xattr {
191 struct rb_node node;
192
193 const char *name;
194 int name_len;
195 const char *val;
196 int val_len;
197 int dirty;
198
199 int should_free_name;
200 int should_free_val;
201 };
202
203 /*
204 * Ceph dentry state
205 */
206 struct ceph_dentry_info {
207 unsigned long flags;
208 struct ceph_mds_session *lease_session;
209 u32 lease_gen, lease_shared_gen;
210 u32 lease_seq;
211 unsigned long lease_renew_after, lease_renew_from;
212 struct list_head lru;
213 struct dentry *dentry;
214 u64 time;
215 u64 offset;
216 };
217
218 /*
219 * dentry flags
220 *
221 * The locking for D_COMPLETE is a bit odd:
222 * - we can clear it at almost any time (see ceph_d_prune)
223 * - it is only meaningful if:
224 * - we hold dir inode i_ceph_lock
225 * - we hold dir FILE_SHARED caps
226 * - the dentry D_COMPLETE is set
227 */
228 #define CEPH_D_COMPLETE 1 /* if set, d_u.d_subdirs is complete directory */
229
230 struct ceph_inode_xattrs_info {
231 /*
232 * (still encoded) xattr blob. we avoid the overhead of parsing
233 * this until someone actually calls getxattr, etc.
234 *
235 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
236 * NULL means we don't know.
237 */
238 struct ceph_buffer *blob, *prealloc_blob;
239
240 struct rb_root index;
241 bool dirty;
242 int count;
243 int names_size;
244 int vals_size;
245 u64 version, index_version;
246 };
247
248 /*
249 * Ceph inode.
250 */
251 struct ceph_inode_info {
252 struct ceph_vino i_vino; /* ceph ino + snap */
253
254 spinlock_t i_ceph_lock;
255
256 u64 i_version;
257 u32 i_time_warp_seq;
258
259 unsigned i_ceph_flags;
260 unsigned long i_release_count;
261
262 struct ceph_dir_layout i_dir_layout;
263 struct ceph_file_layout i_layout;
264 char *i_symlink;
265
266 /* for dirs */
267 struct timespec i_rctime;
268 u64 i_rbytes, i_rfiles, i_rsubdirs;
269 u64 i_files, i_subdirs;
270 u64 i_max_offset; /* largest readdir offset, set with D_COMPLETE */
271
272 struct rb_root i_fragtree;
273 struct mutex i_fragtree_mutex;
274
275 struct ceph_inode_xattrs_info i_xattrs;
276
277 /* capabilities. protected _both_ by i_ceph_lock and cap->session's
278 * s_mutex. */
279 struct rb_root i_caps; /* cap list */
280 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
281 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
282 struct list_head i_dirty_item, i_flushing_item;
283 u64 i_cap_flush_seq;
284 /* we need to track cap writeback on a per-cap-bit basis, to allow
285 * overlapping, pipelined cap flushes to the mds. we can probably
286 * reduce the tid to 8 bits if we're concerned about inode size. */
287 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
288 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
289 unsigned long i_hold_caps_min; /* jiffies */
290 unsigned long i_hold_caps_max; /* jiffies */
291 struct list_head i_cap_delay_list; /* for delayed cap release to mds */
292 int i_cap_exporting_mds; /* to handle cap migration between */
293 unsigned i_cap_exporting_mseq; /* mds's. */
294 unsigned i_cap_exporting_issued;
295 struct ceph_cap_reservation i_cap_migration_resv;
296 struct list_head i_cap_snaps; /* snapped state pending flush to mds */
297 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or
298 dirty|flushing caps */
299 unsigned i_snap_caps; /* cap bits for snapped files */
300
301 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
302
303 u32 i_truncate_seq; /* last truncate to smaller size */
304 u64 i_truncate_size; /* and the size we last truncated down to */
305 int i_truncate_pending; /* still need to call vmtruncate */
306
307 u64 i_max_size; /* max file size authorized by mds */
308 u64 i_reported_size; /* (max_)size reported to or requested of mds */
309 u64 i_wanted_max_size; /* offset we'd like to write too */
310 u64 i_requested_max_size; /* max_size we've requested */
311
312 /* held references to caps */
313 int i_pin_ref;
314 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
315 int i_wrbuffer_ref, i_wrbuffer_ref_head;
316 u32 i_shared_gen; /* increment each time we get FILE_SHARED */
317 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */
318 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
319
320 struct list_head i_unsafe_writes; /* uncommitted sync writes */
321 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
322 spinlock_t i_unsafe_lock;
323
324 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
325 int i_snap_realm_counter; /* snap realm (if caps) */
326 struct list_head i_snap_realm_item;
327 struct list_head i_snap_flush_item;
328
329 struct work_struct i_wb_work; /* writeback work */
330 struct work_struct i_pg_inv_work; /* page invalidation work */
331
332 struct work_struct i_vmtruncate_work;
333
334 struct inode vfs_inode; /* at end */
335 };
336
ceph_inode(struct inode * inode)337 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
338 {
339 return container_of(inode, struct ceph_inode_info, vfs_inode);
340 }
341
ceph_inode_to_client(struct inode * inode)342 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
343 {
344 return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
345 }
346
ceph_sb_to_client(struct super_block * sb)347 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
348 {
349 return (struct ceph_fs_client *)sb->s_fs_info;
350 }
351
ceph_vino(struct inode * inode)352 static inline struct ceph_vino ceph_vino(struct inode *inode)
353 {
354 return ceph_inode(inode)->i_vino;
355 }
356
357 /*
358 * ino_t is <64 bits on many architectures, blech.
359 *
360 * i_ino (kernel inode) st_ino (userspace)
361 * i386 32 32
362 * x86_64+ino32 64 32
363 * x86_64 64 64
364 */
ceph_ino_to_ino32(__u64 vino)365 static inline u32 ceph_ino_to_ino32(__u64 vino)
366 {
367 u32 ino = vino & 0xffffffff;
368 ino ^= vino >> 32;
369 if (!ino)
370 ino = 2;
371 return ino;
372 }
373
374 /*
375 * kernel i_ino value
376 */
ceph_vino_to_ino(struct ceph_vino vino)377 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
378 {
379 #if BITS_PER_LONG == 32
380 return ceph_ino_to_ino32(vino.ino);
381 #else
382 return (ino_t)vino.ino;
383 #endif
384 }
385
386 /*
387 * user-visible ino (stat, filldir)
388 */
389 #if BITS_PER_LONG == 32
ceph_translate_ino(struct super_block * sb,ino_t ino)390 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
391 {
392 return ino;
393 }
394 #else
ceph_translate_ino(struct super_block * sb,ino_t ino)395 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
396 {
397 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
398 ino = ceph_ino_to_ino32(ino);
399 return ino;
400 }
401 #endif
402
403
404 /* for printf-style formatting */
405 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
406
ceph_ino(struct inode * inode)407 static inline u64 ceph_ino(struct inode *inode)
408 {
409 return ceph_inode(inode)->i_vino.ino;
410 }
ceph_snap(struct inode * inode)411 static inline u64 ceph_snap(struct inode *inode)
412 {
413 return ceph_inode(inode)->i_vino.snap;
414 }
415
ceph_ino_compare(struct inode * inode,void * data)416 static inline int ceph_ino_compare(struct inode *inode, void *data)
417 {
418 struct ceph_vino *pvino = (struct ceph_vino *)data;
419 struct ceph_inode_info *ci = ceph_inode(inode);
420 return ci->i_vino.ino == pvino->ino &&
421 ci->i_vino.snap == pvino->snap;
422 }
423
ceph_find_inode(struct super_block * sb,struct ceph_vino vino)424 static inline struct inode *ceph_find_inode(struct super_block *sb,
425 struct ceph_vino vino)
426 {
427 ino_t t = ceph_vino_to_ino(vino);
428 return ilookup5(sb, t, ceph_ino_compare, &vino);
429 }
430
431
432 /*
433 * Ceph inode.
434 */
435 #define CEPH_I_NODELAY 4 /* do not delay cap release */
436 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
437 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */
438
ceph_i_clear(struct inode * inode,unsigned mask)439 static inline void ceph_i_clear(struct inode *inode, unsigned mask)
440 {
441 struct ceph_inode_info *ci = ceph_inode(inode);
442
443 spin_lock(&ci->i_ceph_lock);
444 ci->i_ceph_flags &= ~mask;
445 spin_unlock(&ci->i_ceph_lock);
446 }
447
ceph_i_set(struct inode * inode,unsigned mask)448 static inline void ceph_i_set(struct inode *inode, unsigned mask)
449 {
450 struct ceph_inode_info *ci = ceph_inode(inode);
451
452 spin_lock(&ci->i_ceph_lock);
453 ci->i_ceph_flags |= mask;
454 spin_unlock(&ci->i_ceph_lock);
455 }
456
ceph_i_test(struct inode * inode,unsigned mask)457 static inline bool ceph_i_test(struct inode *inode, unsigned mask)
458 {
459 struct ceph_inode_info *ci = ceph_inode(inode);
460 bool r;
461
462 spin_lock(&ci->i_ceph_lock);
463 r = (ci->i_ceph_flags & mask) == mask;
464 spin_unlock(&ci->i_ceph_lock);
465 return r;
466 }
467
468
469 /* find a specific frag @f */
470 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
471 u32 f);
472
473 /*
474 * choose fragment for value @v. copy frag content to pfrag, if leaf
475 * exists
476 */
477 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
478 struct ceph_inode_frag *pfrag,
479 int *found);
480
ceph_dentry(struct dentry * dentry)481 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
482 {
483 return (struct ceph_dentry_info *)dentry->d_fsdata;
484 }
485
ceph_make_fpos(unsigned frag,unsigned off)486 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
487 {
488 return ((loff_t)frag << 32) | (loff_t)off;
489 }
490
491 /*
492 * set/clear directory D_COMPLETE flag
493 */
494 void ceph_dir_set_complete(struct inode *inode);
495 void ceph_dir_clear_complete(struct inode *inode);
496 bool ceph_dir_test_complete(struct inode *inode);
497
498 /*
499 * caps helpers
500 */
__ceph_is_any_real_caps(struct ceph_inode_info * ci)501 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
502 {
503 return !RB_EMPTY_ROOT(&ci->i_caps);
504 }
505
506 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
507 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
508 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
509 struct ceph_cap *cap);
510
ceph_caps_issued(struct ceph_inode_info * ci)511 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
512 {
513 int issued;
514 spin_lock(&ci->i_ceph_lock);
515 issued = __ceph_caps_issued(ci, NULL);
516 spin_unlock(&ci->i_ceph_lock);
517 return issued;
518 }
519
ceph_caps_issued_mask(struct ceph_inode_info * ci,int mask,int touch)520 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
521 int touch)
522 {
523 int r;
524 spin_lock(&ci->i_ceph_lock);
525 r = __ceph_caps_issued_mask(ci, mask, touch);
526 spin_unlock(&ci->i_ceph_lock);
527 return r;
528 }
529
__ceph_caps_dirty(struct ceph_inode_info * ci)530 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
531 {
532 return ci->i_dirty_caps | ci->i_flushing_caps;
533 }
534 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
535
536 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
537 extern int __ceph_caps_used(struct ceph_inode_info *ci);
538
539 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
540
541 /*
542 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
543 */
__ceph_caps_wanted(struct ceph_inode_info * ci)544 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
545 {
546 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
547 if (w & CEPH_CAP_FILE_BUFFER)
548 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
549 return w;
550 }
551
552 /* what the mds thinks we want */
553 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
554
555 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
556 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
557 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
558 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
559 struct ceph_cap_reservation *ctx, int need);
560 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
561 struct ceph_cap_reservation *ctx);
562 extern void ceph_reservation_status(struct ceph_fs_client *client,
563 int *total, int *avail, int *used,
564 int *reserved, int *min);
565
566
567
568 /*
569 * we keep buffered readdir results attached to file->private_data
570 */
571 #define CEPH_F_SYNC 1
572 #define CEPH_F_ATEND 2
573
574 struct ceph_file_info {
575 short fmode; /* initialized on open */
576 short flags; /* CEPH_F_* */
577
578 /* readdir: position within the dir */
579 u32 frag;
580 struct ceph_mds_request *last_readdir;
581
582 /* readdir: position within a frag */
583 unsigned offset; /* offset of last chunk, adjusted for . and .. */
584 u64 next_offset; /* offset of next chunk (last_name's + 1) */
585 char *last_name; /* last entry in previous chunk */
586 struct dentry *dentry; /* next dentry (for dcache readdir) */
587 unsigned long dir_release_count;
588
589 /* used for -o dirstat read() on directory thing */
590 char *dir_info;
591 int dir_info_len;
592 };
593
594
595
596 /*
597 * A "snap realm" describes a subset of the file hierarchy sharing
598 * the same set of snapshots that apply to it. The realms themselves
599 * are organized into a hierarchy, such that children inherit (some of)
600 * the snapshots of their parents.
601 *
602 * All inodes within the realm that have capabilities are linked into a
603 * per-realm list.
604 */
605 struct ceph_snap_realm {
606 u64 ino;
607 atomic_t nref;
608 struct rb_node node;
609
610 u64 created, seq;
611 u64 parent_ino;
612 u64 parent_since; /* snapid when our current parent became so */
613
614 u64 *prior_parent_snaps; /* snaps inherited from any parents we */
615 int num_prior_parent_snaps; /* had prior to parent_since */
616 u64 *snaps; /* snaps specific to this realm */
617 int num_snaps;
618
619 struct ceph_snap_realm *parent;
620 struct list_head children; /* list of child realms */
621 struct list_head child_item;
622
623 struct list_head empty_item; /* if i have ref==0 */
624
625 struct list_head dirty_item; /* if realm needs new context */
626
627 /* the current set of snaps for this realm */
628 struct ceph_snap_context *cached_context;
629
630 struct list_head inodes_with_caps;
631 spinlock_t inodes_with_caps_lock;
632 };
633
default_congestion_kb(void)634 static inline int default_congestion_kb(void)
635 {
636 int congestion_kb;
637
638 /*
639 * Copied from NFS
640 *
641 * congestion size, scale with available memory.
642 *
643 * 64MB: 8192k
644 * 128MB: 11585k
645 * 256MB: 16384k
646 * 512MB: 23170k
647 * 1GB: 32768k
648 * 2GB: 46340k
649 * 4GB: 65536k
650 * 8GB: 92681k
651 * 16GB: 131072k
652 *
653 * This allows larger machines to have larger/more transfers.
654 * Limit the default to 256M
655 */
656 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
657 if (congestion_kb > 256*1024)
658 congestion_kb = 256*1024;
659
660 return congestion_kb;
661 }
662
663
664
665 /* snap.c */
666 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
667 u64 ino);
668 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
669 struct ceph_snap_realm *realm);
670 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
671 struct ceph_snap_realm *realm);
672 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
673 void *p, void *e, bool deletion);
674 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
675 struct ceph_mds_session *session,
676 struct ceph_msg *msg);
677 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
678 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
679 struct ceph_cap_snap *capsnap);
680 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
681
682 /*
683 * a cap_snap is "pending" if it is still awaiting an in-progress
684 * sync write (that may/may not still update size, mtime, etc.).
685 */
__ceph_have_pending_cap_snap(struct ceph_inode_info * ci)686 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
687 {
688 return !list_empty(&ci->i_cap_snaps) &&
689 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
690 ci_item)->writing;
691 }
692
693 /* inode.c */
694 extern const struct inode_operations ceph_file_iops;
695
696 extern struct inode *ceph_alloc_inode(struct super_block *sb);
697 extern void ceph_destroy_inode(struct inode *inode);
698
699 extern struct inode *ceph_get_inode(struct super_block *sb,
700 struct ceph_vino vino);
701 extern struct inode *ceph_get_snapdir(struct inode *parent);
702 extern int ceph_fill_file_size(struct inode *inode, int issued,
703 u32 truncate_seq, u64 truncate_size, u64 size);
704 extern void ceph_fill_file_time(struct inode *inode, int issued,
705 u64 time_warp_seq, struct timespec *ctime,
706 struct timespec *mtime, struct timespec *atime);
707 extern int ceph_fill_trace(struct super_block *sb,
708 struct ceph_mds_request *req,
709 struct ceph_mds_session *session);
710 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
711 struct ceph_mds_session *session);
712
713 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
714
715 extern int ceph_inode_set_size(struct inode *inode, loff_t size);
716 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
717 extern void ceph_queue_vmtruncate(struct inode *inode);
718
719 extern void ceph_queue_invalidate(struct inode *inode);
720 extern void ceph_queue_writeback(struct inode *inode);
721
722 extern int ceph_do_getattr(struct inode *inode, int mask);
723 extern int ceph_permission(struct inode *inode, int mask);
724 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
725 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
726 struct kstat *stat);
727
728 /* xattr.c */
729 extern int ceph_setxattr(struct dentry *, const char *, const void *,
730 size_t, int);
731 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
732 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
733 extern int ceph_removexattr(struct dentry *, const char *);
734 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
735 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
736 extern void __init ceph_xattr_init(void);
737 extern void ceph_xattr_exit(void);
738
739 /* caps.c */
740 extern const char *ceph_cap_string(int c);
741 extern void ceph_handle_caps(struct ceph_mds_session *session,
742 struct ceph_msg *msg);
743 extern int ceph_add_cap(struct inode *inode,
744 struct ceph_mds_session *session, u64 cap_id,
745 int fmode, unsigned issued, unsigned wanted,
746 unsigned cap, unsigned seq, u64 realmino, int flags,
747 struct ceph_cap_reservation *caps_reservation);
748 extern void __ceph_remove_cap(struct ceph_cap *cap);
ceph_remove_cap(struct ceph_cap * cap)749 static inline void ceph_remove_cap(struct ceph_cap *cap)
750 {
751 spin_lock(&cap->ci->i_ceph_lock);
752 __ceph_remove_cap(cap);
753 spin_unlock(&cap->ci->i_ceph_lock);
754 }
755 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
756 struct ceph_cap *cap);
757
758 extern void ceph_queue_caps_release(struct inode *inode);
759 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
760 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
761 int datasync);
762 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
763 struct ceph_mds_session *session);
764 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
765 int mds);
766 extern int ceph_get_cap_mds(struct inode *inode);
767 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
768 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
769 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
770 struct ceph_snap_context *snapc);
771 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
772 struct ceph_mds_session **psession,
773 int again);
774 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
775 struct ceph_mds_session *session);
776 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
777 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
778
779 extern int ceph_encode_inode_release(void **p, struct inode *inode,
780 int mds, int drop, int unless, int force);
781 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
782 int mds, int drop, int unless);
783
784 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
785 int *got, loff_t endoff);
786
787 /* for counting open files by mode */
__ceph_get_fmode(struct ceph_inode_info * ci,int mode)788 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
789 {
790 ci->i_nr_by_mode[mode]++;
791 }
792 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
793
794 /* addr.c */
795 extern const struct address_space_operations ceph_aops;
796 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
797
798 /* file.c */
799 extern const struct file_operations ceph_file_fops;
800 extern const struct address_space_operations ceph_aops;
801 extern int ceph_copy_to_page_vector(struct page **pages,
802 const char *data,
803 loff_t off, size_t len);
804 extern int ceph_copy_from_page_vector(struct page **pages,
805 char *data,
806 loff_t off, size_t len);
807 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
808 extern int ceph_open(struct inode *inode, struct file *file);
809 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
810 struct nameidata *nd, int mode,
811 int locked_dir);
812 extern int ceph_release(struct inode *inode, struct file *filp);
813
814 /* dir.c */
815 extern const struct file_operations ceph_dir_fops;
816 extern const struct inode_operations ceph_dir_iops;
817 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
818 ceph_snapdir_dentry_ops;
819
820 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
821 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
822 struct dentry *dentry, int err);
823 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
824 struct dentry *dentry, int err);
825
826 extern void ceph_dentry_lru_add(struct dentry *dn);
827 extern void ceph_dentry_lru_touch(struct dentry *dn);
828 extern void ceph_dentry_lru_del(struct dentry *dn);
829 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
830 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
831 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
832
833 /*
834 * our d_ops vary depending on whether the inode is live,
835 * snapshotted (read-only), or a virtual ".snap" directory.
836 */
837 int ceph_init_dentry(struct dentry *dentry);
838
839
840 /* ioctl.c */
841 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
842
843 /* export.c */
844 extern const struct export_operations ceph_export_ops;
845
846 /* locks.c */
847 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
848 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
849 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
850 extern int ceph_encode_locks_to_buffer(struct inode *inode,
851 struct ceph_filelock *flocks,
852 int num_fcntl_locks,
853 int num_flock_locks);
854 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
855 struct ceph_pagelist *pagelist,
856 int num_fcntl_locks, int num_flock_locks);
857 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
858
859 /* debugfs.c */
860 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
861 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
862
863 #endif /* _FS_CEPH_SUPER_H */
864