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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/*
Sage Weil6a259382010-07-07 09:06:08 -070034 * Supported features
35 */
Greg Farnumc6f3fdc2010-08-02 14:55:24 -070036#define CEPH_FEATURE_SUPPORTED CEPH_FEATURE_NOSRCADDR | CEPH_FEATURE_FLOCK
Sage Weil6a259382010-07-07 09:06:08 -070037#define CEPH_FEATURE_REQUIRED CEPH_FEATURE_NOSRCADDR
38
39/*
Sage Weilde576062009-10-06 11:31:07 -070040 * mount options
41 */
42#define CEPH_OPT_FSID (1<<0)
43#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
44#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
45#define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
46#define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
47#define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
48#define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
49
50#define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
51
52#define ceph_set_opt(client, opt) \
Sage Weil6b805182009-10-27 11:50:50 -070053 (client)->mount_args->flags |= CEPH_OPT_##opt;
Sage Weilde576062009-10-06 11:31:07 -070054#define ceph_test_opt(client, opt) \
Sage Weil6b805182009-10-27 11:50:50 -070055 (!!((client)->mount_args->flags & CEPH_OPT_##opt))
Sage Weilde576062009-10-06 11:31:07 -070056
57
Sage Weilde576062009-10-06 11:31:07 -070058struct ceph_mount_args {
59 int sb_flags;
60 int flags;
Sage Weilde576062009-10-06 11:31:07 -070061 struct ceph_fsid fsid;
62 struct ceph_entity_addr my_addr;
Sage Weil6e19a162010-04-29 16:38:32 -070063 int num_mon;
64 struct ceph_entity_addr *mon_addr;
65 int mount_timeout;
66 int osd_idle_ttl;
Sage Weilde576062009-10-06 11:31:07 -070067 int osd_timeout;
Yehuda Sadeh422d2cb2010-02-26 15:32:31 -080068 int osd_keepalive_timeout;
Sage Weil6e19a162010-04-29 16:38:32 -070069 int wsize;
70 int rsize; /* max readahead */
71 int congestion_kb; /* max writeback in flight */
72 int caps_wanted_delay_min, caps_wanted_delay_max;
73 int cap_release_safety;
Sage Weil23804d92010-05-14 13:06:30 -070074 int max_readdir; /* max readdir result (entires) */
75 int max_readdir_bytes; /* max readdir result (bytes) */
Sage Weilde576062009-10-06 11:31:07 -070076 char *snapdir_name; /* default ".snap" */
Sage Weil4e7a5dc2009-11-18 16:19:57 -080077 char *name;
Sage Weilde576062009-10-06 11:31:07 -070078 char *secret;
Sage Weilde576062009-10-06 11:31:07 -070079};
80
81/*
82 * defaults
83 */
84#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
Yehuda Sadeh422d2cb2010-02-26 15:32:31 -080085#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
86#define CEPH_OSD_KEEPALIVE_DEFAULT 5
Yehuda Sadehf5a20412010-02-03 11:00:26 -080087#define CEPH_OSD_IDLE_TTL_DEFAULT 60
Sage Weil8fa97652009-10-16 14:44:35 -070088#define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
Sage Weil6e19a162010-04-29 16:38:32 -070089#define CEPH_MAX_READDIR_DEFAULT 1024
Sage Weil23804d92010-05-14 13:06:30 -070090#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
Sage Weilde576062009-10-06 11:31:07 -070091
92#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
93#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
94
95#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
Sage Weil4e7a5dc2009-11-18 16:19:57 -080096#define CEPH_AUTH_NAME_DEFAULT "guest"
Sage Weilde576062009-10-06 11:31:07 -070097/*
98 * Delay telling the MDS we no longer want caps, in case we reopen
99 * the file. Delay a minimum amount of time, even if we send a cap
100 * message for some other reason. Otherwise, take the oppotunity to
101 * update the mds to avoid sending another message later.
102 */
103#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
104#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
105
Sage Weil6e19a162010-04-29 16:38:32 -0700106#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
Sage Weilde576062009-10-06 11:31:07 -0700107
108/* mount state */
109enum {
110 CEPH_MOUNT_MOUNTING,
111 CEPH_MOUNT_MOUNTED,
112 CEPH_MOUNT_UNMOUNTING,
113 CEPH_MOUNT_UNMOUNTED,
114 CEPH_MOUNT_SHUTDOWN,
115};
116
117/*
118 * subtract jiffies
119 */
120static inline unsigned long time_sub(unsigned long a, unsigned long b)
121{
122 BUG_ON(time_after(b, a));
123 return (long)a - (long)b;
124}
125
126/*
127 * per-filesystem client state
128 *
129 * possibly shared by multiple mount points, if they are
130 * mounting the same ceph filesystem/cluster.
131 */
132struct ceph_client {
Sage Weil07433042009-11-18 16:50:41 -0800133 struct ceph_fsid fsid;
134 bool have_fsid;
Sage Weilde576062009-10-06 11:31:07 -0700135
136 struct mutex mount_mutex; /* serialize mount attempts */
Sage Weil6b805182009-10-27 11:50:50 -0700137 struct ceph_mount_args *mount_args;
Sage Weilde576062009-10-06 11:31:07 -0700138
139 struct super_block *sb;
140
141 unsigned long mount_state;
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800142 wait_queue_head_t auth_wq;
Sage Weilde576062009-10-06 11:31:07 -0700143
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800144 int auth_err;
Sage Weilde576062009-10-06 11:31:07 -0700145
Sage Weil85ccce42010-02-17 10:02:43 -0800146 int min_caps; /* min caps i added */
147
Sage Weilde576062009-10-06 11:31:07 -0700148 struct ceph_messenger *msgr; /* messenger instance */
149 struct ceph_mon_client monc;
150 struct ceph_mds_client mdsc;
151 struct ceph_osd_client osdc;
152
153 /* writeback */
154 mempool_t *wb_pagevec_pool;
155 struct workqueue_struct *wb_wq;
156 struct workqueue_struct *pg_inv_wq;
157 struct workqueue_struct *trunc_wq;
Yehuda Sadeh2baba252009-12-18 13:51:57 -0800158 atomic_long_t writeback_count;
Sage Weilde576062009-10-06 11:31:07 -0700159
160 struct backing_dev_info backing_dev_info;
Sage Weil07433042009-11-18 16:50:41 -0800161
162#ifdef CONFIG_DEBUG_FS
163 struct dentry *debugfs_monmap;
164 struct dentry *debugfs_mdsmap, *debugfs_osdmap;
165 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
Yehuda Sadeh2baba252009-12-18 13:51:57 -0800166 struct dentry *debugfs_congestion_kb;
Sage Weil06edf042009-12-15 14:44:32 -0800167 struct dentry *debugfs_bdi;
Sage Weil07433042009-11-18 16:50:41 -0800168#endif
Sage Weilde576062009-10-06 11:31:07 -0700169};
170
Sage Weilde576062009-10-06 11:31:07 -0700171/*
172 * File i/o capability. This tracks shared state with the metadata
173 * server that allows us to cache or writeback attributes or to read
174 * and write data. For any given inode, we should have one or more
175 * capabilities, one issued by each metadata server, and our
176 * cumulative access is the OR of all issued capabilities.
177 *
178 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
179 * session capability lists.
180 */
181struct ceph_cap {
182 struct ceph_inode_info *ci;
183 struct rb_node ci_node; /* per-ci cap tree */
184 struct ceph_mds_session *session;
185 struct list_head session_caps; /* per-session caplist */
186 int mds;
187 u64 cap_id; /* unique cap id (mds provided) */
188 int issued; /* latest, from the mds */
189 int implemented; /* implemented superset of issued (for revocation) */
190 int mds_wanted;
Sage Weil685f9a5d2009-11-09 12:05:48 -0800191 u32 seq, issue_seq, mseq;
192 u32 cap_gen; /* active/stale cycle */
Sage Weilde576062009-10-06 11:31:07 -0700193 unsigned long last_used;
194 struct list_head caps_item;
195};
196
197#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
198#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
199#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
200
201/*
202 * Snapped cap state that is pending flush to mds. When a snapshot occurs,
203 * we first complete any in-process sync writes and writeback any dirty
204 * data before flushing the snapped state (tracked here) back to the MDS.
205 */
206struct ceph_cap_snap {
207 atomic_t nref;
208 struct ceph_inode_info *ci;
209 struct list_head ci_item, flushing_item;
210
211 u64 follows, flush_tid;
212 int issued, dirty;
213 struct ceph_snap_context *context;
214
215 mode_t mode;
216 uid_t uid;
217 gid_t gid;
218
Sage Weil4a625be2010-08-22 15:03:56 -0700219 struct ceph_buffer *xattr_blob;
Sage Weilde576062009-10-06 11:31:07 -0700220 u64 xattr_version;
221
222 u64 size;
223 struct timespec mtime, atime, ctime;
224 u64 time_warp_seq;
225 int writing; /* a sync write is still in progress */
226 int dirty_pages; /* dirty pages awaiting writeback */
227};
228
229static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
230{
Sage Weil4a625be2010-08-22 15:03:56 -0700231 if (atomic_dec_and_test(&capsnap->nref)) {
232 if (capsnap->xattr_blob)
233 ceph_buffer_put(capsnap->xattr_blob);
Sage Weilde576062009-10-06 11:31:07 -0700234 kfree(capsnap);
Sage Weil4a625be2010-08-22 15:03:56 -0700235 }
Sage Weilde576062009-10-06 11:31:07 -0700236}
237
238/*
239 * The frag tree describes how a directory is fragmented, potentially across
240 * multiple metadata servers. It is also used to indicate points where
241 * metadata authority is delegated, and whether/where metadata is replicated.
242 *
243 * A _leaf_ frag will be present in the i_fragtree IFF there is
244 * delegation info. That is, if mds >= 0 || ndist > 0.
245 */
246#define CEPH_MAX_DIRFRAG_REP 4
247
248struct ceph_inode_frag {
249 struct rb_node node;
250
251 /* fragtree state */
252 u32 frag;
253 int split_by; /* i.e. 2^(split_by) children */
254
255 /* delegation and replication info */
256 int mds; /* -1 if same authority as parent */
257 int ndist; /* >0 if replicated */
258 int dist[CEPH_MAX_DIRFRAG_REP];
259};
260
261/*
262 * We cache inode xattrs as an encoded blob until they are first used,
263 * at which point we parse them into an rbtree.
264 */
265struct ceph_inode_xattr {
266 struct rb_node node;
267
268 const char *name;
269 int name_len;
270 const char *val;
271 int val_len;
272 int dirty;
273
274 int should_free_name;
275 int should_free_val;
276};
277
278struct ceph_inode_xattrs_info {
279 /*
280 * (still encoded) xattr blob. we avoid the overhead of parsing
281 * this until someone actually calls getxattr, etc.
282 *
283 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
284 * NULL means we don't know.
285 */
286 struct ceph_buffer *blob, *prealloc_blob;
287
288 struct rb_root index;
289 bool dirty;
290 int count;
291 int names_size;
292 int vals_size;
293 u64 version, index_version;
294};
295
296/*
297 * Ceph inode.
298 */
299#define CEPH_I_COMPLETE 1 /* we have complete directory cached */
300#define CEPH_I_NODELAY 4 /* do not delay cap release */
301#define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
Sage Weile9964c12010-03-01 15:16:56 -0800302#define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */
Sage Weilde576062009-10-06 11:31:07 -0700303
304struct ceph_inode_info {
305 struct ceph_vino i_vino; /* ceph ino + snap */
306
307 u64 i_version;
308 u32 i_time_warp_seq;
309
310 unsigned i_ceph_flags;
311 unsigned long i_release_count;
312
313 struct ceph_file_layout i_layout;
314 char *i_symlink;
315
316 /* for dirs */
317 struct timespec i_rctime;
318 u64 i_rbytes, i_rfiles, i_rsubdirs;
319 u64 i_files, i_subdirs;
320 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
321
322 struct rb_root i_fragtree;
323 struct mutex i_fragtree_mutex;
324
325 struct ceph_inode_xattrs_info i_xattrs;
326
327 /* capabilities. protected _both_ by i_lock and cap->session's
328 * s_mutex. */
329 struct rb_root i_caps; /* cap list */
330 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
331 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
332 struct list_head i_dirty_item, i_flushing_item;
333 u64 i_cap_flush_seq;
334 /* we need to track cap writeback on a per-cap-bit basis, to allow
335 * overlapping, pipelined cap flushes to the mds. we can probably
336 * reduce the tid to 8 bits if we're concerned about inode size. */
337 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
338 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
339 unsigned long i_hold_caps_min; /* jiffies */
340 unsigned long i_hold_caps_max; /* jiffies */
341 struct list_head i_cap_delay_list; /* for delayed cap release to mds */
342 int i_cap_exporting_mds; /* to handle cap migration between */
343 unsigned i_cap_exporting_mseq; /* mds's. */
344 unsigned i_cap_exporting_issued;
345 struct ceph_cap_reservation i_cap_migration_resv;
346 struct list_head i_cap_snaps; /* snapped state pending flush to mds */
Sage Weil7d8cb262010-08-24 08:44:16 -0700347 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or
348 dirty|flushing caps */
Sage Weilde576062009-10-06 11:31:07 -0700349 unsigned i_snap_caps; /* cap bits for snapped files */
350
351 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
352
353 u32 i_truncate_seq; /* last truncate to smaller size */
354 u64 i_truncate_size; /* and the size we last truncated down to */
355 int i_truncate_pending; /* still need to call vmtruncate */
356
357 u64 i_max_size; /* max file size authorized by mds */
358 u64 i_reported_size; /* (max_)size reported to or requested of mds */
359 u64 i_wanted_max_size; /* offset we'd like to write too */
360 u64 i_requested_max_size; /* max_size we've requested */
361
362 /* held references to caps */
363 int i_pin_ref;
364 int i_rd_ref, i_rdcache_ref, i_wr_ref;
365 int i_wrbuffer_ref, i_wrbuffer_ref_head;
366 u32 i_shared_gen; /* increment each time we get FILE_SHARED */
367 u32 i_rdcache_gen; /* we increment this each time we get
368 FILE_CACHE. If it's non-zero, we
369 _may_ have cached pages. */
370 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
371
372 struct list_head i_unsafe_writes; /* uncommitted sync writes */
373 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
374 spinlock_t i_unsafe_lock;
375
376 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
377 int i_snap_realm_counter; /* snap realm (if caps) */
378 struct list_head i_snap_realm_item;
379 struct list_head i_snap_flush_item;
380
381 struct work_struct i_wb_work; /* writeback work */
382 struct work_struct i_pg_inv_work; /* page invalidation work */
383
384 struct work_struct i_vmtruncate_work;
385
386 struct inode vfs_inode; /* at end */
387};
388
389static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
390{
Noah Watkinsfbbccec2009-10-28 11:54:49 -0700391 return container_of(inode, struct ceph_inode_info, vfs_inode);
Sage Weilde576062009-10-06 11:31:07 -0700392}
393
394static inline void ceph_i_clear(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 void ceph_i_set(struct inode *inode, unsigned mask)
404{
405 struct ceph_inode_info *ci = ceph_inode(inode);
406
407 spin_lock(&inode->i_lock);
408 ci->i_ceph_flags |= mask;
409 spin_unlock(&inode->i_lock);
410}
411
412static inline bool ceph_i_test(struct inode *inode, unsigned mask)
413{
414 struct ceph_inode_info *ci = ceph_inode(inode);
415 bool r;
416
417 smp_mb();
418 r = (ci->i_ceph_flags & mask) == mask;
419 return r;
420}
421
422
423/* find a specific frag @f */
424extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
425 u32 f);
426
427/*
428 * choose fragment for value @v. copy frag content to pfrag, if leaf
429 * exists
430 */
431extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
432 struct ceph_inode_frag *pfrag,
433 int *found);
434
435/*
436 * Ceph dentry state
437 */
438struct ceph_dentry_info {
439 struct ceph_mds_session *lease_session;
440 u32 lease_gen, lease_shared_gen;
441 u32 lease_seq;
442 unsigned long lease_renew_after, lease_renew_from;
443 struct list_head lru;
444 struct dentry *dentry;
445 u64 time;
446 u64 offset;
447};
448
449static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
450{
451 return (struct ceph_dentry_info *)dentry->d_fsdata;
452}
453
454static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
455{
456 return ((loff_t)frag << 32) | (loff_t)off;
457}
458
459/*
460 * ino_t is <64 bits on many architectures, blech.
461 *
462 * don't include snap in ino hash, at least for now.
463 */
464static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
465{
466 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
467#if BITS_PER_LONG == 32
468 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
469 if (!ino)
470 ino = 1;
471#endif
472 return ino;
473}
474
475static inline int ceph_set_ino_cb(struct inode *inode, void *data)
476{
477 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
478 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
479 return 0;
480}
481
482static inline struct ceph_vino ceph_vino(struct inode *inode)
483{
484 return ceph_inode(inode)->i_vino;
485}
486
487/* for printf-style formatting */
488#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
489
490static inline u64 ceph_ino(struct inode *inode)
491{
492 return ceph_inode(inode)->i_vino.ino;
493}
494static inline u64 ceph_snap(struct inode *inode)
495{
496 return ceph_inode(inode)->i_vino.snap;
497}
498
499static inline int ceph_ino_compare(struct inode *inode, void *data)
500{
501 struct ceph_vino *pvino = (struct ceph_vino *)data;
502 struct ceph_inode_info *ci = ceph_inode(inode);
503 return ci->i_vino.ino == pvino->ino &&
504 ci->i_vino.snap == pvino->snap;
505}
506
507static inline struct inode *ceph_find_inode(struct super_block *sb,
508 struct ceph_vino vino)
509{
510 ino_t t = ceph_vino_to_ino(vino);
511 return ilookup5(sb, t, ceph_ino_compare, &vino);
512}
513
514
515/*
516 * caps helpers
517 */
518static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
519{
520 return !RB_EMPTY_ROOT(&ci->i_caps);
521}
522
523extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
524extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
525extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
526 struct ceph_cap *cap);
527
528static inline int ceph_caps_issued(struct ceph_inode_info *ci)
529{
530 int issued;
531 spin_lock(&ci->vfs_inode.i_lock);
532 issued = __ceph_caps_issued(ci, NULL);
533 spin_unlock(&ci->vfs_inode.i_lock);
534 return issued;
535}
536
537static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
538 int touch)
539{
540 int r;
541 spin_lock(&ci->vfs_inode.i_lock);
542 r = __ceph_caps_issued_mask(ci, mask, touch);
543 spin_unlock(&ci->vfs_inode.i_lock);
544 return r;
545}
546
547static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
548{
549 return ci->i_dirty_caps | ci->i_flushing_caps;
550}
Sage Weilafcdaea2009-10-14 14:27:38 -0700551extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
Sage Weilde576062009-10-06 11:31:07 -0700552
553extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
554extern int __ceph_caps_used(struct ceph_inode_info *ci);
555
556extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
557
558/*
559 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
560 */
561static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
562{
563 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
564 if (w & CEPH_CAP_FILE_BUFFER)
565 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
566 return w;
567}
568
569/* what the mds thinks we want */
570extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
571
Yehuda Sadeh37151662010-06-17 16:16:12 -0700572extern void ceph_caps_init(struct ceph_mds_client *mdsc);
573extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
574extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
575extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
576 struct ceph_cap_reservation *ctx, int need);
577extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
578 struct ceph_cap_reservation *ctx);
Sage Weilde576062009-10-06 11:31:07 -0700579extern void ceph_reservation_status(struct ceph_client *client,
580 int *total, int *avail, int *used,
Sage Weil85ccce42010-02-17 10:02:43 -0800581 int *reserved, int *min);
Sage Weilde576062009-10-06 11:31:07 -0700582
583static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
584{
585 return (struct ceph_client *)inode->i_sb->s_fs_info;
586}
587
588static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
589{
590 return (struct ceph_client *)sb->s_fs_info;
591}
592
Sage Weilde576062009-10-06 11:31:07 -0700593
594/*
595 * we keep buffered readdir results attached to file->private_data
596 */
597struct ceph_file_info {
598 int fmode; /* initialized on open */
599
600 /* readdir: position within the dir */
601 u32 frag;
602 struct ceph_mds_request *last_readdir;
603 int at_end;
604
605 /* readdir: position within a frag */
606 unsigned offset; /* offset of last chunk, adjusted for . and .. */
607 u64 next_offset; /* offset of next chunk (last_name's + 1) */
608 char *last_name; /* last entry in previous chunk */
609 struct dentry *dentry; /* next dentry (for dcache readdir) */
610 unsigned long dir_release_count;
611
612 /* used for -o dirstat read() on directory thing */
613 char *dir_info;
614 int dir_info_len;
615};
616
617
618
619/*
620 * snapshots
621 */
622
623/*
624 * A "snap context" is the set of existing snapshots when we
625 * write data. It is used by the OSD to guide its COW behavior.
626 *
627 * The ceph_snap_context is refcounted, and attached to each dirty
628 * page, indicating which context the dirty data belonged when it was
629 * dirtied.
630 */
631struct ceph_snap_context {
632 atomic_t nref;
633 u64 seq;
634 int num_snaps;
635 u64 snaps[];
636};
637
638static inline struct ceph_snap_context *
639ceph_get_snap_context(struct ceph_snap_context *sc)
640{
641 /*
642 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
643 atomic_read(&sc->nref)+1);
644 */
645 if (sc)
646 atomic_inc(&sc->nref);
647 return sc;
648}
649
650static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
651{
652 if (!sc)
653 return;
654 /*
655 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
656 atomic_read(&sc->nref)-1);
657 */
658 if (atomic_dec_and_test(&sc->nref)) {
659 /*printk(" deleting snap_context %p\n", sc);*/
660 kfree(sc);
661 }
662}
663
664/*
665 * A "snap realm" describes a subset of the file hierarchy sharing
666 * the same set of snapshots that apply to it. The realms themselves
667 * are organized into a hierarchy, such that children inherit (some of)
668 * the snapshots of their parents.
669 *
670 * All inodes within the realm that have capabilities are linked into a
671 * per-realm list.
672 */
673struct ceph_snap_realm {
674 u64 ino;
675 atomic_t nref;
Sage Weila105f002010-02-15 14:37:55 -0800676 struct rb_node node;
677
Sage Weilde576062009-10-06 11:31:07 -0700678 u64 created, seq;
679 u64 parent_ino;
680 u64 parent_since; /* snapid when our current parent became so */
681
682 u64 *prior_parent_snaps; /* snaps inherited from any parents we */
683 int num_prior_parent_snaps; /* had prior to parent_since */
684 u64 *snaps; /* snaps specific to this realm */
685 int num_snaps;
686
687 struct ceph_snap_realm *parent;
688 struct list_head children; /* list of child realms */
689 struct list_head child_item;
690
691 struct list_head empty_item; /* if i have ref==0 */
692
693 /* the current set of snaps for this realm */
694 struct ceph_snap_context *cached_context;
695
696 struct list_head inodes_with_caps;
697 spinlock_t inodes_with_caps_lock;
698};
699
700
701
702/*
703 * calculate the number of pages a given length and offset map onto,
704 * if we align the data.
705 */
706static inline int calc_pages_for(u64 off, u64 len)
707{
708 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
709 (off >> PAGE_CACHE_SHIFT);
710}
711
712
713
714/* snap.c */
715struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
716 u64 ino);
717extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
718 struct ceph_snap_realm *realm);
719extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
720 struct ceph_snap_realm *realm);
721extern int ceph_update_snap_trace(struct ceph_mds_client *m,
722 void *p, void *e, bool deletion);
723extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
Sage Weil2600d2d2010-02-22 15:12:16 -0800724 struct ceph_mds_session *session,
Sage Weilde576062009-10-06 11:31:07 -0700725 struct ceph_msg *msg);
Sage Weilfc837c8f2010-04-13 11:41:22 -0700726extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
Sage Weilde576062009-10-06 11:31:07 -0700727extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
728 struct ceph_cap_snap *capsnap);
729extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
730
731/*
732 * a cap_snap is "pending" if it is still awaiting an in-progress
733 * sync write (that may/may not still update size, mtime, etc.).
734 */
735static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
736{
737 return !list_empty(&ci->i_cap_snaps) &&
738 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
739 ci_item)->writing;
740}
741
742
743/* super.c */
744extern struct kmem_cache *ceph_inode_cachep;
745extern struct kmem_cache *ceph_cap_cachep;
746extern struct kmem_cache *ceph_dentry_cachep;
747extern struct kmem_cache *ceph_file_cachep;
748
749extern const char *ceph_msg_type_name(int type);
Sage Weil07433042009-11-18 16:50:41 -0800750extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
Sage Weilde576062009-10-06 11:31:07 -0700751
Sage Weilde576062009-10-06 11:31:07 -0700752/* inode.c */
753extern const struct inode_operations ceph_file_iops;
754
755extern struct inode *ceph_alloc_inode(struct super_block *sb);
756extern void ceph_destroy_inode(struct inode *inode);
757
758extern struct inode *ceph_get_inode(struct super_block *sb,
759 struct ceph_vino vino);
760extern struct inode *ceph_get_snapdir(struct inode *parent);
761extern int ceph_fill_file_size(struct inode *inode, int issued,
762 u32 truncate_seq, u64 truncate_size, u64 size);
763extern void ceph_fill_file_time(struct inode *inode, int issued,
764 u64 time_warp_seq, struct timespec *ctime,
765 struct timespec *mtime, struct timespec *atime);
766extern int ceph_fill_trace(struct super_block *sb,
767 struct ceph_mds_request *req,
768 struct ceph_mds_session *session);
769extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
770 struct ceph_mds_session *session);
771
772extern int ceph_inode_holds_cap(struct inode *inode, int mask);
773
774extern int ceph_inode_set_size(struct inode *inode, loff_t size);
Sage Weilde576062009-10-06 11:31:07 -0700775extern void __ceph_do_pending_vmtruncate(struct inode *inode);
Sage Weil3c6f6b72010-02-09 15:24:44 -0800776extern void ceph_queue_vmtruncate(struct inode *inode);
777
778extern void ceph_queue_invalidate(struct inode *inode);
779extern void ceph_queue_writeback(struct inode *inode);
Sage Weilde576062009-10-06 11:31:07 -0700780
781extern int ceph_do_getattr(struct inode *inode, int mask);
782extern int ceph_permission(struct inode *inode, int mask);
783extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
784extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
785 struct kstat *stat);
786
787/* xattr.c */
788extern int ceph_setxattr(struct dentry *, const char *, const void *,
789 size_t, int);
790extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
791extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
792extern int ceph_removexattr(struct dentry *, const char *);
793extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
794extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
795
796/* caps.c */
797extern const char *ceph_cap_string(int c);
798extern void ceph_handle_caps(struct ceph_mds_session *session,
799 struct ceph_msg *msg);
800extern int ceph_add_cap(struct inode *inode,
801 struct ceph_mds_session *session, u64 cap_id,
802 int fmode, unsigned issued, unsigned wanted,
803 unsigned cap, unsigned seq, u64 realmino, int flags,
804 struct ceph_cap_reservation *caps_reservation);
Sage Weil7c1332b2010-02-16 11:39:45 -0800805extern void __ceph_remove_cap(struct ceph_cap *cap);
Sage Weilde576062009-10-06 11:31:07 -0700806static inline void ceph_remove_cap(struct ceph_cap *cap)
807{
808 struct inode *inode = &cap->ci->vfs_inode;
809 spin_lock(&inode->i_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -0800810 __ceph_remove_cap(cap);
Sage Weilde576062009-10-06 11:31:07 -0700811 spin_unlock(&inode->i_lock);
812}
Yehuda Sadeh37151662010-06-17 16:16:12 -0700813extern void ceph_put_cap(struct ceph_mds_client *mdsc,
814 struct ceph_cap *cap);
Sage Weilde576062009-10-06 11:31:07 -0700815
816extern void ceph_queue_caps_release(struct inode *inode);
Stephen Rothwellf1a3d572010-01-18 11:53:08 +1100817extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200818extern int ceph_fsync(struct file *file, int datasync);
Sage Weilde576062009-10-06 11:31:07 -0700819extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
820 struct ceph_mds_session *session);
Greg Farnum2bc50252010-06-30 12:44:34 -0700821extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
822 int mds);
Sage Weilde576062009-10-06 11:31:07 -0700823extern int ceph_get_cap_mds(struct inode *inode);
824extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
825extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
826extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
827 struct ceph_snap_context *snapc);
828extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
829 struct ceph_mds_session **psession);
830extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
831 struct ceph_mds_session *session);
Sage Weilafcdaea2009-10-14 14:27:38 -0700832extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
833extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
Sage Weilde576062009-10-06 11:31:07 -0700834
835extern int ceph_encode_inode_release(void **p, struct inode *inode,
836 int mds, int drop, int unless, int force);
837extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
838 int mds, int drop, int unless);
839
840extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
841 int *got, loff_t endoff);
842
843/* for counting open files by mode */
844static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
845{
846 ci->i_nr_by_mode[mode]++;
847}
848extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
849
850/* addr.c */
851extern const struct address_space_operations ceph_aops;
852extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
853
854/* file.c */
855extern const struct file_operations ceph_file_fops;
856extern const struct address_space_operations ceph_aops;
857extern int ceph_open(struct inode *inode, struct file *file);
858extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
859 struct nameidata *nd, int mode,
860 int locked_dir);
861extern int ceph_release(struct inode *inode, struct file *filp);
862extern void ceph_release_page_vector(struct page **pages, int num_pages);
863
864/* dir.c */
865extern const struct file_operations ceph_dir_fops;
866extern const struct inode_operations ceph_dir_iops;
Sage Weil52dfb8a2010-08-03 10:25:30 -0700867extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
Sage Weilde576062009-10-06 11:31:07 -0700868 ceph_snapdir_dentry_ops;
869
870extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
871extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
872 struct dentry *dentry, int err);
873
874extern void ceph_dentry_lru_add(struct dentry *dn);
875extern void ceph_dentry_lru_touch(struct dentry *dn);
876extern void ceph_dentry_lru_del(struct dentry *dn);
Sage Weil81a6cf22010-05-14 09:35:38 -0700877extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
Sage Weilde576062009-10-06 11:31:07 -0700878
879/*
880 * our d_ops vary depending on whether the inode is live,
881 * snapshotted (read-only), or a virtual ".snap" directory.
882 */
883int ceph_init_dentry(struct dentry *dentry);
884
885
886/* ioctl.c */
887extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
888
889/* export.c */
890extern const struct export_operations ceph_export_ops;
891
892/* debugfs.c */
893extern int ceph_debugfs_init(void);
894extern void ceph_debugfs_cleanup(void);
895extern int ceph_debugfs_client_init(struct ceph_client *client);
896extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
897
Greg Farnum40819f62010-08-02 15:34:23 -0700898/* locks.c */
899extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
900extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
901extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
902extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
903 int p_locks, int f_locks);
904extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
905
Sage Weilde576062009-10-06 11:31:07 -0700906static inline struct inode *get_dentry_parent_inode(struct dentry *dentry)
907{
908 if (dentry && dentry->d_parent)
909 return dentry->d_parent->d_inode;
910
911 return NULL;
912}
913
914#endif /* _FS_CEPH_SUPER_H */