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Sage Weilde576062009-10-06 11:31:07 -07001#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>
Stephen Rothwellf1a3d572010-01-18 11:53:08 +110014#include <linux/writeback.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Sage Weilde576062009-10-06 11:31:07 -070016
17#include "types.h"
18#include "messenger.h"
19#include "msgpool.h"
20#include "mon_client.h"
21#include "mds_client.h"
22#include "osd_client.h"
23#include "ceph_fs.h"
24
25/* f_type in struct statfs */
26#define CEPH_SUPER_MAGIC 0x00c36400
27
28/* large granularity for statfs utilization stats to facilitate
29 * large volume sizes on 32-bit machines. */
30#define CEPH_BLOCK_SHIFT 20 /* 1 MB */
31#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
32
33/*
34 * mount options
35 */
36#define CEPH_OPT_FSID (1<<0)
37#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
38#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
39#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
40#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
41#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
42#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
43
44#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
45
46#define ceph_set_opt(client, opt) \
Sage Weil6b805182009-10-27 11:50:50 -070047 (client)->mount_args->flags |= CEPH_OPT_##opt;
Sage Weilde576062009-10-06 11:31:07 -070048#define ceph_test_opt(client, opt) \
Sage Weil6b805182009-10-27 11:50:50 -070049 (!!((client)->mount_args->flags & CEPH_OPT_##opt))
Sage Weilde576062009-10-06 11:31:07 -070050
51
Sage Weilde576062009-10-06 11:31:07 -070052struct ceph_mount_args {
53 int sb_flags;
54 int flags;
Sage Weilde576062009-10-06 11:31:07 -070055 struct ceph_fsid fsid;
56 struct ceph_entity_addr my_addr;
Sage Weil6e19a162010-04-29 16:38:32 -070057 int num_mon;
58 struct ceph_entity_addr *mon_addr;
59 int mount_timeout;
60 int osd_idle_ttl;
Sage Weilde576062009-10-06 11:31:07 -070061 int osd_timeout;
Yehuda Sadeh422d2cb2010-02-26 15:32:31 -080062 int osd_keepalive_timeout;
Sage Weil6e19a162010-04-29 16:38:32 -070063 int wsize;
64 int rsize; /* max readahead */
65 int congestion_kb; /* max writeback in flight */
66 int caps_wanted_delay_min, caps_wanted_delay_max;
67 int cap_release_safety;
Sage Weil23804d92010-05-14 13:06:30 -070068 int max_readdir; /* max readdir result (entires) */
69 int max_readdir_bytes; /* max readdir result (bytes) */
Sage Weilde576062009-10-06 11:31:07 -070070 char *snapdir_name; /* default ".snap" */
Sage Weil4e7a5dc2009-11-18 16:19:57 -080071 char *name;
Sage Weilde576062009-10-06 11:31:07 -070072 char *secret;
Sage Weilde576062009-10-06 11:31:07 -070073};
74
75/*
76 * defaults
77 */
78#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
Yehuda Sadeh422d2cb2010-02-26 15:32:31 -080079#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
80#define CEPH_OSD_KEEPALIVE_DEFAULT 5
Yehuda Sadehf5a20412010-02-03 11:00:26 -080081#define CEPH_OSD_IDLE_TTL_DEFAULT 60
Sage Weil8fa97652009-10-16 14:44:35 -070082#define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
Sage Weil6e19a162010-04-29 16:38:32 -070083#define CEPH_MAX_READDIR_DEFAULT 1024
Sage Weil23804d92010-05-14 13:06:30 -070084#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
Sage Weilde576062009-10-06 11:31:07 -070085
86#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
87#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
88
89#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
Sage Weil4e7a5dc2009-11-18 16:19:57 -080090#define CEPH_AUTH_NAME_DEFAULT "guest"
Sage Weilde576062009-10-06 11:31:07 -070091/*
92 * Delay telling the MDS we no longer want caps, in case we reopen
93 * the file. Delay a minimum amount of time, even if we send a cap
94 * message for some other reason. Otherwise, take the oppotunity to
95 * update the mds to avoid sending another message later.
96 */
97#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
98#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
99
Sage Weil6e19a162010-04-29 16:38:32 -0700100#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
Sage Weilde576062009-10-06 11:31:07 -0700101
102/* mount state */
103enum {
104 CEPH_MOUNT_MOUNTING,
105 CEPH_MOUNT_MOUNTED,
106 CEPH_MOUNT_UNMOUNTING,
107 CEPH_MOUNT_UNMOUNTED,
108 CEPH_MOUNT_SHUTDOWN,
109};
110
111/*
112 * subtract jiffies
113 */
114static inline unsigned long time_sub(unsigned long a, unsigned long b)
115{
116 BUG_ON(time_after(b, a));
117 return (long)a - (long)b;
118}
119
120/*
121 * per-filesystem client state
122 *
123 * possibly shared by multiple mount points, if they are
124 * mounting the same ceph filesystem/cluster.
125 */
126struct ceph_client {
Sage Weil07433042009-11-18 16:50:41 -0800127 struct ceph_fsid fsid;
128 bool have_fsid;
Sage Weilde576062009-10-06 11:31:07 -0700129
130 struct mutex mount_mutex; /* serialize mount attempts */
Sage Weil6b805182009-10-27 11:50:50 -0700131 struct ceph_mount_args *mount_args;
Sage Weilde576062009-10-06 11:31:07 -0700132
133 struct super_block *sb;
134
135 unsigned long mount_state;
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800136 wait_queue_head_t auth_wq;
Sage Weilde576062009-10-06 11:31:07 -0700137
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800138 int auth_err;
Sage Weilde576062009-10-06 11:31:07 -0700139
Sage Weil85ccce42010-02-17 10:02:43 -0800140 int min_caps; /* min caps i added */
141
Sage Weilde576062009-10-06 11:31:07 -0700142 struct ceph_messenger *msgr; /* messenger instance */
143 struct ceph_mon_client monc;
144 struct ceph_mds_client mdsc;
145 struct ceph_osd_client osdc;
146
147 /* writeback */
148 mempool_t *wb_pagevec_pool;
149 struct workqueue_struct *wb_wq;
150 struct workqueue_struct *pg_inv_wq;
151 struct workqueue_struct *trunc_wq;
Yehuda Sadeh2baba252009-12-18 13:51:57 -0800152 atomic_long_t writeback_count;
Sage Weilde576062009-10-06 11:31:07 -0700153
154 struct backing_dev_info backing_dev_info;
Sage Weil07433042009-11-18 16:50:41 -0800155
156#ifdef CONFIG_DEBUG_FS
157 struct dentry *debugfs_monmap;
158 struct dentry *debugfs_mdsmap, *debugfs_osdmap;
159 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
Yehuda Sadeh2baba252009-12-18 13:51:57 -0800160 struct dentry *debugfs_congestion_kb;
Sage Weil06edf042009-12-15 14:44:32 -0800161 struct dentry *debugfs_bdi;
Sage Weil07433042009-11-18 16:50:41 -0800162#endif
Sage Weilde576062009-10-06 11:31:07 -0700163};
164
Sage Weilde576062009-10-06 11:31:07 -0700165/*
166 * File i/o capability. This tracks shared state with the metadata
167 * server that allows us to cache or writeback attributes or to read
168 * and write data. For any given inode, we should have one or more
169 * capabilities, one issued by each metadata server, and our
170 * cumulative access is the OR of all issued capabilities.
171 *
172 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
173 * session capability lists.
174 */
175struct ceph_cap {
176 struct ceph_inode_info *ci;
177 struct rb_node ci_node; /* per-ci cap tree */
178 struct ceph_mds_session *session;
179 struct list_head session_caps; /* per-session caplist */
180 int mds;
181 u64 cap_id; /* unique cap id (mds provided) */
182 int issued; /* latest, from the mds */
183 int implemented; /* implemented superset of issued (for revocation) */
184 int mds_wanted;
Sage Weil685f9a5d2009-11-09 12:05:48 -0800185 u32 seq, issue_seq, mseq;
186 u32 cap_gen; /* active/stale cycle */
Sage Weilde576062009-10-06 11:31:07 -0700187 unsigned long last_used;
188 struct list_head caps_item;
189};
190
191#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
192#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
193#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
194
195/*
196 * Snapped cap state that is pending flush to mds. When a snapshot occurs,
197 * we first complete any in-process sync writes and writeback any dirty
198 * data before flushing the snapped state (tracked here) back to the MDS.
199 */
200struct ceph_cap_snap {
201 atomic_t nref;
202 struct ceph_inode_info *ci;
203 struct list_head ci_item, flushing_item;
204
205 u64 follows, flush_tid;
206 int issued, dirty;
207 struct ceph_snap_context *context;
208
209 mode_t mode;
210 uid_t uid;
211 gid_t gid;
212
213 void *xattr_blob;
214 int xattr_len;
215 u64 xattr_version;
216
217 u64 size;
218 struct timespec mtime, atime, ctime;
219 u64 time_warp_seq;
220 int writing; /* a sync write is still in progress */
221 int dirty_pages; /* dirty pages awaiting writeback */
222};
223
224static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
225{
226 if (atomic_dec_and_test(&capsnap->nref))
227 kfree(capsnap);
228}
229
230/*
231 * The frag tree describes how a directory is fragmented, potentially across
232 * multiple metadata servers. It is also used to indicate points where
233 * metadata authority is delegated, and whether/where metadata is replicated.
234 *
235 * A _leaf_ frag will be present in the i_fragtree IFF there is
236 * delegation info. That is, if mds >= 0 || ndist > 0.
237 */
238#define CEPH_MAX_DIRFRAG_REP 4
239
240struct ceph_inode_frag {
241 struct rb_node node;
242
243 /* fragtree state */
244 u32 frag;
245 int split_by; /* i.e. 2^(split_by) children */
246
247 /* delegation and replication info */
248 int mds; /* -1 if same authority as parent */
249 int ndist; /* >0 if replicated */
250 int dist[CEPH_MAX_DIRFRAG_REP];
251};
252
253/*
254 * We cache inode xattrs as an encoded blob until they are first used,
255 * at which point we parse them into an rbtree.
256 */
257struct ceph_inode_xattr {
258 struct rb_node node;
259
260 const char *name;
261 int name_len;
262 const char *val;
263 int val_len;
264 int dirty;
265
266 int should_free_name;
267 int should_free_val;
268};
269
270struct ceph_inode_xattrs_info {
271 /*
272 * (still encoded) xattr blob. we avoid the overhead of parsing
273 * this until someone actually calls getxattr, etc.
274 *
275 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
276 * NULL means we don't know.
277 */
278 struct ceph_buffer *blob, *prealloc_blob;
279
280 struct rb_root index;
281 bool dirty;
282 int count;
283 int names_size;
284 int vals_size;
285 u64 version, index_version;
286};
287
288/*
289 * Ceph inode.
290 */
291#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
292#define CEPH_I_NODELAY 4 /* do not delay cap release */
293#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
Sage Weile9964c12010-03-01 15:16:56 -0800294#define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */
Sage Weilde576062009-10-06 11:31:07 -0700295
296struct ceph_inode_info {
297 struct ceph_vino i_vino; /* ceph ino + snap */
298
299 u64 i_version;
300 u32 i_time_warp_seq;
301
302 unsigned i_ceph_flags;
303 unsigned long i_release_count;
304
305 struct ceph_file_layout i_layout;
306 char *i_symlink;
307
308 /* for dirs */
309 struct timespec i_rctime;
310 u64 i_rbytes, i_rfiles, i_rsubdirs;
311 u64 i_files, i_subdirs;
312 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
313
314 struct rb_root i_fragtree;
315 struct mutex i_fragtree_mutex;
316
317 struct ceph_inode_xattrs_info i_xattrs;
318
319 /* capabilities. protected _both_ by i_lock and cap->session's
320 * s_mutex. */
321 struct rb_root i_caps; /* cap list */
322 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
323 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
324 struct list_head i_dirty_item, i_flushing_item;
325 u64 i_cap_flush_seq;
326 /* we need to track cap writeback on a per-cap-bit basis, to allow
327 * overlapping, pipelined cap flushes to the mds. we can probably
328 * reduce the tid to 8 bits if we're concerned about inode size. */
329 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
330 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
331 unsigned long i_hold_caps_min; /* jiffies */
332 unsigned long i_hold_caps_max; /* jiffies */
333 struct list_head i_cap_delay_list; /* for delayed cap release to mds */
334 int i_cap_exporting_mds; /* to handle cap migration between */
335 unsigned i_cap_exporting_mseq; /* mds's. */
336 unsigned i_cap_exporting_issued;
337 struct ceph_cap_reservation i_cap_migration_resv;
338 struct list_head i_cap_snaps; /* snapped state pending flush to mds */
339 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */
340 unsigned i_snap_caps; /* cap bits for snapped files */
341
342 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
343
344 u32 i_truncate_seq; /* last truncate to smaller size */
345 u64 i_truncate_size; /* and the size we last truncated down to */
346 int i_truncate_pending; /* still need to call vmtruncate */
347
348 u64 i_max_size; /* max file size authorized by mds */
349 u64 i_reported_size; /* (max_)size reported to or requested of mds */
350 u64 i_wanted_max_size; /* offset we'd like to write too */
351 u64 i_requested_max_size; /* max_size we've requested */
352
353 /* held references to caps */
354 int i_pin_ref;
355 int i_rd_ref, i_rdcache_ref, i_wr_ref;
356 int i_wrbuffer_ref, i_wrbuffer_ref_head;
357 u32 i_shared_gen; /* increment each time we get FILE_SHARED */
358 u32 i_rdcache_gen; /* we increment this each time we get
359 FILE_CACHE. If it's non-zero, we
360 _may_ have cached pages. */
361 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
362
363 struct list_head i_unsafe_writes; /* uncommitted sync writes */
364 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
365 spinlock_t i_unsafe_lock;
366
367 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
368 int i_snap_realm_counter; /* snap realm (if caps) */
369 struct list_head i_snap_realm_item;
370 struct list_head i_snap_flush_item;
371
372 struct work_struct i_wb_work; /* writeback work */
373 struct work_struct i_pg_inv_work; /* page invalidation work */
374
375 struct work_struct i_vmtruncate_work;
376
377 struct inode vfs_inode; /* at end */
378};
379
380static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
381{
Noah Watkinsfbbccec2009-10-28 11:54:49 -0700382 return container_of(inode, struct ceph_inode_info, vfs_inode);
Sage Weilde576062009-10-06 11:31:07 -0700383}
384
385static inline void ceph_i_clear(struct inode *inode, unsigned mask)
386{
387 struct ceph_inode_info *ci = ceph_inode(inode);
388
389 spin_lock(&inode->i_lock);
390 ci->i_ceph_flags &= ~mask;
391 spin_unlock(&inode->i_lock);
392}
393
394static inline void ceph_i_set(struct inode *inode, unsigned mask)
395{
396 struct ceph_inode_info *ci = ceph_inode(inode);
397
398 spin_lock(&inode->i_lock);
399 ci->i_ceph_flags |= mask;
400 spin_unlock(&inode->i_lock);
401}
402
403static inline bool ceph_i_test(struct inode *inode, unsigned mask)
404{
405 struct ceph_inode_info *ci = ceph_inode(inode);
406 bool r;
407
408 smp_mb();
409 r = (ci->i_ceph_flags & mask) == mask;
410 return r;
411}
412
413
414/* find a specific frag @f */
415extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
416 u32 f);
417
418/*
419 * choose fragment for value @v. copy frag content to pfrag, if leaf
420 * exists
421 */
422extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
423 struct ceph_inode_frag *pfrag,
424 int *found);
425
426/*
427 * Ceph dentry state
428 */
429struct ceph_dentry_info {
430 struct ceph_mds_session *lease_session;
431 u32 lease_gen, lease_shared_gen;
432 u32 lease_seq;
433 unsigned long lease_renew_after, lease_renew_from;
434 struct list_head lru;
435 struct dentry *dentry;
436 u64 time;
437 u64 offset;
438};
439
440static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
441{
442 return (struct ceph_dentry_info *)dentry->d_fsdata;
443}
444
445static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
446{
447 return ((loff_t)frag << 32) | (loff_t)off;
448}
449
450/*
451 * ino_t is <64 bits on many architectures, blech.
452 *
453 * don't include snap in ino hash, at least for now.
454 */
455static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
456{
457 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
458#if BITS_PER_LONG == 32
459 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
460 if (!ino)
461 ino = 1;
462#endif
463 return ino;
464}
465
466static inline int ceph_set_ino_cb(struct inode *inode, void *data)
467{
468 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
469 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
470 return 0;
471}
472
473static inline struct ceph_vino ceph_vino(struct inode *inode)
474{
475 return ceph_inode(inode)->i_vino;
476}
477
478/* for printf-style formatting */
479#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
480
481static inline u64 ceph_ino(struct inode *inode)
482{
483 return ceph_inode(inode)->i_vino.ino;
484}
485static inline u64 ceph_snap(struct inode *inode)
486{
487 return ceph_inode(inode)->i_vino.snap;
488}
489
490static inline int ceph_ino_compare(struct inode *inode, void *data)
491{
492 struct ceph_vino *pvino = (struct ceph_vino *)data;
493 struct ceph_inode_info *ci = ceph_inode(inode);
494 return ci->i_vino.ino == pvino->ino &&
495 ci->i_vino.snap == pvino->snap;
496}
497
498static inline struct inode *ceph_find_inode(struct super_block *sb,
499 struct ceph_vino vino)
500{
501 ino_t t = ceph_vino_to_ino(vino);
502 return ilookup5(sb, t, ceph_ino_compare, &vino);
503}
504
505
506/*
507 * caps helpers
508 */
509static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
510{
511 return !RB_EMPTY_ROOT(&ci->i_caps);
512}
513
514extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
515extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
516extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
517 struct ceph_cap *cap);
518
519static inline int ceph_caps_issued(struct ceph_inode_info *ci)
520{
521 int issued;
522 spin_lock(&ci->vfs_inode.i_lock);
523 issued = __ceph_caps_issued(ci, NULL);
524 spin_unlock(&ci->vfs_inode.i_lock);
525 return issued;
526}
527
528static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
529 int touch)
530{
531 int r;
532 spin_lock(&ci->vfs_inode.i_lock);
533 r = __ceph_caps_issued_mask(ci, mask, touch);
534 spin_unlock(&ci->vfs_inode.i_lock);
535 return r;
536}
537
538static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
539{
540 return ci->i_dirty_caps | ci->i_flushing_caps;
541}
Sage Weilafcdaea2009-10-14 14:27:38 -0700542extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
Sage Weilde576062009-10-06 11:31:07 -0700543
544extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
545extern int __ceph_caps_used(struct ceph_inode_info *ci);
546
547extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
548
549/*
550 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
551 */
552static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
553{
554 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
555 if (w & CEPH_CAP_FILE_BUFFER)
556 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
557 return w;
558}
559
560/* what the mds thinks we want */
561extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
562
563extern void ceph_caps_init(void);
564extern void ceph_caps_finalize(void);
Sage Weil85ccce42010-02-17 10:02:43 -0800565extern void ceph_adjust_min_caps(int delta);
Sage Weilde576062009-10-06 11:31:07 -0700566extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need);
567extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx);
568extern void ceph_reservation_status(struct ceph_client *client,
569 int *total, int *avail, int *used,
Sage Weil85ccce42010-02-17 10:02:43 -0800570 int *reserved, int *min);
Sage Weilde576062009-10-06 11:31:07 -0700571
572static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
573{
574 return (struct ceph_client *)inode->i_sb->s_fs_info;
575}
576
577static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
578{
579 return (struct ceph_client *)sb->s_fs_info;
580}
581
Sage Weilde576062009-10-06 11:31:07 -0700582
583/*
584 * we keep buffered readdir results attached to file->private_data
585 */
586struct ceph_file_info {
587 int fmode; /* initialized on open */
588
589 /* readdir: position within the dir */
590 u32 frag;
591 struct ceph_mds_request *last_readdir;
592 int at_end;
593
594 /* readdir: position within a frag */
595 unsigned offset; /* offset of last chunk, adjusted for . and .. */
596 u64 next_offset; /* offset of next chunk (last_name's + 1) */
597 char *last_name; /* last entry in previous chunk */
598 struct dentry *dentry; /* next dentry (for dcache readdir) */
599 unsigned long dir_release_count;
600
601 /* used for -o dirstat read() on directory thing */
602 char *dir_info;
603 int dir_info_len;
604};
605
606
607
608/*
609 * snapshots
610 */
611
612/*
613 * A "snap context" is the set of existing snapshots when we
614 * write data. It is used by the OSD to guide its COW behavior.
615 *
616 * The ceph_snap_context is refcounted, and attached to each dirty
617 * page, indicating which context the dirty data belonged when it was
618 * dirtied.
619 */
620struct ceph_snap_context {
621 atomic_t nref;
622 u64 seq;
623 int num_snaps;
624 u64 snaps[];
625};
626
627static inline struct ceph_snap_context *
628ceph_get_snap_context(struct ceph_snap_context *sc)
629{
630 /*
631 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
632 atomic_read(&sc->nref)+1);
633 */
634 if (sc)
635 atomic_inc(&sc->nref);
636 return sc;
637}
638
639static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
640{
641 if (!sc)
642 return;
643 /*
644 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
645 atomic_read(&sc->nref)-1);
646 */
647 if (atomic_dec_and_test(&sc->nref)) {
648 /*printk(" deleting snap_context %p\n", sc);*/
649 kfree(sc);
650 }
651}
652
653/*
654 * A "snap realm" describes a subset of the file hierarchy sharing
655 * the same set of snapshots that apply to it. The realms themselves
656 * are organized into a hierarchy, such that children inherit (some of)
657 * the snapshots of their parents.
658 *
659 * All inodes within the realm that have capabilities are linked into a
660 * per-realm list.
661 */
662struct ceph_snap_realm {
663 u64 ino;
664 atomic_t nref;
Sage Weila105f002010-02-15 14:37:55 -0800665 struct rb_node node;
666
Sage Weilde576062009-10-06 11:31:07 -0700667 u64 created, seq;
668 u64 parent_ino;
669 u64 parent_since; /* snapid when our current parent became so */
670
671 u64 *prior_parent_snaps; /* snaps inherited from any parents we */
672 int num_prior_parent_snaps; /* had prior to parent_since */
673 u64 *snaps; /* snaps specific to this realm */
674 int num_snaps;
675
676 struct ceph_snap_realm *parent;
677 struct list_head children; /* list of child realms */
678 struct list_head child_item;
679
680 struct list_head empty_item; /* if i have ref==0 */
681
682 /* the current set of snaps for this realm */
683 struct ceph_snap_context *cached_context;
684
685 struct list_head inodes_with_caps;
686 spinlock_t inodes_with_caps_lock;
687};
688
689
690
691/*
692 * calculate the number of pages a given length and offset map onto,
693 * if we align the data.
694 */
695static inline int calc_pages_for(u64 off, u64 len)
696{
697 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
698 (off >> PAGE_CACHE_SHIFT);
699}
700
701
702
703/* snap.c */
704struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
705 u64 ino);
706extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
707 struct ceph_snap_realm *realm);
708extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
709 struct ceph_snap_realm *realm);
710extern int ceph_update_snap_trace(struct ceph_mds_client *m,
711 void *p, void *e, bool deletion);
712extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
Sage Weil2600d2d2010-02-22 15:12:16 -0800713 struct ceph_mds_session *session,
Sage Weilde576062009-10-06 11:31:07 -0700714 struct ceph_msg *msg);
Sage Weilfc837c8f2010-04-13 11:41:22 -0700715extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
Sage Weilde576062009-10-06 11:31:07 -0700716extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
717 struct ceph_cap_snap *capsnap);
718extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
719
720/*
721 * a cap_snap is "pending" if it is still awaiting an in-progress
722 * sync write (that may/may not still update size, mtime, etc.).
723 */
724static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
725{
726 return !list_empty(&ci->i_cap_snaps) &&
727 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
728 ci_item)->writing;
729}
730
731
732/* super.c */
733extern struct kmem_cache *ceph_inode_cachep;
734extern struct kmem_cache *ceph_cap_cachep;
735extern struct kmem_cache *ceph_dentry_cachep;
736extern struct kmem_cache *ceph_file_cachep;
737
738extern const char *ceph_msg_type_name(int type);
Sage Weil07433042009-11-18 16:50:41 -0800739extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
Sage Weilde576062009-10-06 11:31:07 -0700740
741#define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
742 "%02x%02x%02x%02x%02x%02x"
743#define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \
744 (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \
745 (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \
746 (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15]
747
748/* inode.c */
749extern const struct inode_operations ceph_file_iops;
750
751extern struct inode *ceph_alloc_inode(struct super_block *sb);
752extern void ceph_destroy_inode(struct inode *inode);
753
754extern struct inode *ceph_get_inode(struct super_block *sb,
755 struct ceph_vino vino);
756extern struct inode *ceph_get_snapdir(struct inode *parent);
757extern int ceph_fill_file_size(struct inode *inode, int issued,
758 u32 truncate_seq, u64 truncate_size, u64 size);
759extern void ceph_fill_file_time(struct inode *inode, int issued,
760 u64 time_warp_seq, struct timespec *ctime,
761 struct timespec *mtime, struct timespec *atime);
762extern int ceph_fill_trace(struct super_block *sb,
763 struct ceph_mds_request *req,
764 struct ceph_mds_session *session);
765extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
766 struct ceph_mds_session *session);
767
768extern int ceph_inode_holds_cap(struct inode *inode, int mask);
769
770extern int ceph_inode_set_size(struct inode *inode, loff_t size);
Sage Weilde576062009-10-06 11:31:07 -0700771extern void __ceph_do_pending_vmtruncate(struct inode *inode);
Sage Weil3c6f6b72010-02-09 15:24:44 -0800772extern void ceph_queue_vmtruncate(struct inode *inode);
773
774extern void ceph_queue_invalidate(struct inode *inode);
775extern void ceph_queue_writeback(struct inode *inode);
Sage Weilde576062009-10-06 11:31:07 -0700776
777extern int ceph_do_getattr(struct inode *inode, int mask);
778extern int ceph_permission(struct inode *inode, int mask);
779extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
780extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
781 struct kstat *stat);
782
783/* xattr.c */
784extern int ceph_setxattr(struct dentry *, const char *, const void *,
785 size_t, int);
786extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
787extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
788extern int ceph_removexattr(struct dentry *, const char *);
789extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
790extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
791
792/* caps.c */
793extern const char *ceph_cap_string(int c);
794extern void ceph_handle_caps(struct ceph_mds_session *session,
795 struct ceph_msg *msg);
796extern int ceph_add_cap(struct inode *inode,
797 struct ceph_mds_session *session, u64 cap_id,
798 int fmode, unsigned issued, unsigned wanted,
799 unsigned cap, unsigned seq, u64 realmino, int flags,
800 struct ceph_cap_reservation *caps_reservation);
Sage Weil7c1332b2010-02-16 11:39:45 -0800801extern void __ceph_remove_cap(struct ceph_cap *cap);
Sage Weilde576062009-10-06 11:31:07 -0700802static inline void ceph_remove_cap(struct ceph_cap *cap)
803{
804 struct inode *inode = &cap->ci->vfs_inode;
805 spin_lock(&inode->i_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800806 __ceph_remove_cap(cap);
Sage Weilde576062009-10-06 11:31:07 -0700807 spin_unlock(&inode->i_lock);
808}
Sage Weil7c1332b2010-02-16 11:39:45 -0800809extern void ceph_put_cap(struct ceph_cap *cap);
Sage Weilde576062009-10-06 11:31:07 -0700810
811extern void ceph_queue_caps_release(struct inode *inode);
Stephen Rothwellf1a3d572010-01-18 11:53:08 +1100812extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200813extern int ceph_fsync(struct file *file, int datasync);
Sage Weilde576062009-10-06 11:31:07 -0700814extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
815 struct ceph_mds_session *session);
816extern int ceph_get_cap_mds(struct inode *inode);
817extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
818extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
819extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
820 struct ceph_snap_context *snapc);
821extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
822 struct ceph_mds_session **psession);
823extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
824 struct ceph_mds_session *session);
Sage Weilafcdaea2009-10-14 14:27:38 -0700825extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
826extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
Sage Weilde576062009-10-06 11:31:07 -0700827
828extern int ceph_encode_inode_release(void **p, struct inode *inode,
829 int mds, int drop, int unless, int force);
830extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
831 int mds, int drop, int unless);
832
833extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
834 int *got, loff_t endoff);
835
836/* for counting open files by mode */
837static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
838{
839 ci->i_nr_by_mode[mode]++;
840}
841extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
842
843/* addr.c */
844extern const struct address_space_operations ceph_aops;
845extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
846
847/* file.c */
848extern const struct file_operations ceph_file_fops;
849extern const struct address_space_operations ceph_aops;
850extern int ceph_open(struct inode *inode, struct file *file);
851extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
852 struct nameidata *nd, int mode,
853 int locked_dir);
854extern int ceph_release(struct inode *inode, struct file *filp);
855extern void ceph_release_page_vector(struct page **pages, int num_pages);
856
857/* dir.c */
858extern const struct file_operations ceph_dir_fops;
859extern const struct inode_operations ceph_dir_iops;
860extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
861 ceph_snapdir_dentry_ops;
862
863extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
864extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
865 struct dentry *dentry, int err);
866
867extern void ceph_dentry_lru_add(struct dentry *dn);
868extern void ceph_dentry_lru_touch(struct dentry *dn);
869extern void ceph_dentry_lru_del(struct dentry *dn);
Sage Weil81a6cf22010-05-14 09:35:38 -0700870extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
Sage Weilde576062009-10-06 11:31:07 -0700871
872/*
873 * our d_ops vary depending on whether the inode is live,
874 * snapshotted (read-only), or a virtual ".snap" directory.
875 */
876int ceph_init_dentry(struct dentry *dentry);
877
878
879/* ioctl.c */
880extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
881
882/* export.c */
883extern const struct export_operations ceph_export_ops;
884
885/* debugfs.c */
886extern int ceph_debugfs_init(void);
887extern void ceph_debugfs_cleanup(void);
888extern int ceph_debugfs_client_init(struct ceph_client *client);
889extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
890
891static 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 */