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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 20 /* 1 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
46struct 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
67struct 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 */
106struct 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 */
131struct 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
154static 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
173struct 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 */
190struct 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 */
206struct 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
230struct 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 */
251struct 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
337static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
338{
339 return container_of(inode, struct ceph_inode_info, vfs_inode);
340}
341
342static 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
347static 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
352static 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 */
365static 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 */
377static 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
390static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
391{
392 return ino;
393}
394#else
395static 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
407static inline u64 ceph_ino(struct inode *inode)
408{
409 return ceph_inode(inode)->i_vino.ino;
410}
411static inline u64 ceph_snap(struct inode *inode)
412{
413 return ceph_inode(inode)->i_vino.snap;
414}
415
416static 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
424static 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
439static 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
448static 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
457static 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 */
470extern 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 */
477extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
478 struct ceph_inode_frag *pfrag,
479 int *found);
480
481static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
482{
483 return (struct ceph_dentry_info *)dentry->d_fsdata;
484}
485
486static 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 */
494void ceph_dir_set_complete(struct inode *inode);
495void ceph_dir_clear_complete(struct inode *inode);
496bool ceph_dir_test_complete(struct inode *inode);
497
498/*
499 * caps helpers
500 */
501static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
502{
503 return !RB_EMPTY_ROOT(&ci->i_caps);
504}
505
506extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
507extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
508extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
509 struct ceph_cap *cap);
510
511static 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
520static 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
530static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
531{
532 return ci->i_dirty_caps | ci->i_flushing_caps;
533}
534extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
535
536extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
537extern int __ceph_caps_used(struct ceph_inode_info *ci);
538
539extern 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 */
544static 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 */
553extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
554
555extern void ceph_caps_init(struct ceph_mds_client *mdsc);
556extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
557extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
558extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
559 struct ceph_cap_reservation *ctx, int need);
560extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
561 struct ceph_cap_reservation *ctx);
562extern 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
574struct 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 */
605struct 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
634static 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 */
666struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
667 u64 ino);
668extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
669 struct ceph_snap_realm *realm);
670extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
671 struct ceph_snap_realm *realm);
672extern int ceph_update_snap_trace(struct ceph_mds_client *m,
673 void *p, void *e, bool deletion);
674extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
675 struct ceph_mds_session *session,
676 struct ceph_msg *msg);
677extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
678extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
679 struct ceph_cap_snap *capsnap);
680extern 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 */
686static 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 */
694extern const struct inode_operations ceph_file_iops;
695
696extern struct inode *ceph_alloc_inode(struct super_block *sb);
697extern void ceph_destroy_inode(struct inode *inode);
698
699extern struct inode *ceph_get_inode(struct super_block *sb,
700 struct ceph_vino vino);
701extern struct inode *ceph_get_snapdir(struct inode *parent);
702extern int ceph_fill_file_size(struct inode *inode, int issued,
703 u32 truncate_seq, u64 truncate_size, u64 size);
704extern 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);
707extern int ceph_fill_trace(struct super_block *sb,
708 struct ceph_mds_request *req,
709 struct ceph_mds_session *session);
710extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
711 struct ceph_mds_session *session);
712
713extern int ceph_inode_holds_cap(struct inode *inode, int mask);
714
715extern int ceph_inode_set_size(struct inode *inode, loff_t size);
716extern void __ceph_do_pending_vmtruncate(struct inode *inode);
717extern void ceph_queue_vmtruncate(struct inode *inode);
718
719extern void ceph_queue_invalidate(struct inode *inode);
720extern void ceph_queue_writeback(struct inode *inode);
721
722extern int ceph_do_getattr(struct inode *inode, int mask);
723extern int ceph_permission(struct inode *inode, int mask);
724extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
725extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
726 struct kstat *stat);
727
728/* xattr.c */
729extern int ceph_setxattr(struct dentry *, const char *, const void *,
730 size_t, int);
731extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
732extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
733extern int ceph_removexattr(struct dentry *, const char *);
734extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
735extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
736extern void __init ceph_xattr_init(void);
737extern void ceph_xattr_exit(void);
738
739/* caps.c */
740extern const char *ceph_cap_string(int c);
741extern void ceph_handle_caps(struct ceph_mds_session *session,
742 struct ceph_msg *msg);
743extern 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);
748extern void __ceph_remove_cap(struct ceph_cap *cap);
749static 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}
755extern void ceph_put_cap(struct ceph_mds_client *mdsc,
756 struct ceph_cap *cap);
757
758extern void ceph_queue_caps_release(struct inode *inode);
759extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
760extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
761 int datasync);
762extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
763 struct ceph_mds_session *session);
764extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
765 int mds);
766extern int ceph_get_cap_mds(struct inode *inode);
767extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
768extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
769extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
770 struct ceph_snap_context *snapc);
771extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
772 struct ceph_mds_session **psession,
773 int again);
774extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
775 struct ceph_mds_session *session);
776extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
777extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
778
779extern int ceph_encode_inode_release(void **p, struct inode *inode,
780 int mds, int drop, int unless, int force);
781extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
782 int mds, int drop, int unless);
783
784extern 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 */
788static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
789{
790 ci->i_nr_by_mode[mode]++;
791}
792extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
793
794/* addr.c */
795extern const struct address_space_operations ceph_aops;
796extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
797
798/* file.c */
799extern const struct file_operations ceph_file_fops;
800extern const struct address_space_operations ceph_aops;
801extern int ceph_copy_to_page_vector(struct page **pages,
802 const char *data,
803 loff_t off, size_t len);
804extern int ceph_copy_from_page_vector(struct page **pages,
805 char *data,
806 loff_t off, size_t len);
807extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
808extern int ceph_open(struct inode *inode, struct file *file);
809extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
810 struct nameidata *nd, int mode,
811 int locked_dir);
812extern int ceph_release(struct inode *inode, struct file *filp);
813
814/* dir.c */
815extern const struct file_operations ceph_dir_fops;
816extern const struct inode_operations ceph_dir_iops;
817extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
818 ceph_snapdir_dentry_ops;
819
820extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
821extern int ceph_handle_snapdir(struct ceph_mds_request *req,
822 struct dentry *dentry, int err);
823extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
824 struct dentry *dentry, int err);
825
826extern void ceph_dentry_lru_add(struct dentry *dn);
827extern void ceph_dentry_lru_touch(struct dentry *dn);
828extern void ceph_dentry_lru_del(struct dentry *dn);
829extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
830extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
831extern 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 */
837int ceph_init_dentry(struct dentry *dentry);
838
839
840/* ioctl.c */
841extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
842
843/* export.c */
844extern const struct export_operations ceph_export_ops;
845
846/* locks.c */
847extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
848extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
849extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
850extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
851 int p_locks, int f_locks);
852extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
853
854/* debugfs.c */
855extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
856extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
857
858#endif /* _FS_CEPH_SUPER_H */
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#include <linux/posix_acl.h>
17
18#include <linux/ceph/libceph.h>
19
20#ifdef CONFIG_CEPH_FSCACHE
21#include <linux/fscache.h>
22#endif
23
24/* f_type in struct statfs */
25#define CEPH_SUPER_MAGIC 0x00c36400
26
27/* large granularity for statfs utilization stats to facilitate
28 * large volume sizes on 32-bit machines. */
29#define CEPH_BLOCK_SHIFT 22 /* 4 MB */
30#define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
31
32#define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */
33#define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
34#define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
35#define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */
36#define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */
37#define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */
38#define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */
39#define CEPH_MOUNT_OPT_MOUNTWAIT (1<<12) /* mount waits if no mds is up */
40
41#define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE
42
43#define ceph_set_mount_opt(fsc, opt) \
44 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
45#define ceph_test_mount_opt(fsc, opt) \
46 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
47
48#define CEPH_RSIZE_DEFAULT 0 /* max read size */
49#define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */
50#define CEPH_MAX_READDIR_DEFAULT 1024
51#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
52#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
53
54struct ceph_mount_options {
55 int flags;
56 int sb_flags;
57
58 int wsize; /* max write size */
59 int rsize; /* max read size */
60 int rasize; /* max readahead */
61 int congestion_kb; /* max writeback in flight */
62 int caps_wanted_delay_min, caps_wanted_delay_max;
63 int cap_release_safety;
64 int max_readdir; /* max readdir result (entires) */
65 int max_readdir_bytes; /* max readdir result (bytes) */
66
67 /*
68 * everything above this point can be memcmp'd; everything below
69 * is handled in compare_mount_options()
70 */
71
72 char *snapdir_name; /* default ".snap" */
73 char *mds_namespace; /* default NULL */
74 char *server_path; /* default "/" */
75};
76
77struct ceph_fs_client {
78 struct super_block *sb;
79
80 struct ceph_mount_options *mount_options;
81 struct ceph_client *client;
82
83 unsigned long mount_state;
84 int min_caps; /* min caps i added */
85
86 struct ceph_mds_client *mdsc;
87
88 /* writeback */
89 mempool_t *wb_pagevec_pool;
90 struct workqueue_struct *wb_wq;
91 struct workqueue_struct *pg_inv_wq;
92 struct workqueue_struct *trunc_wq;
93 atomic_long_t writeback_count;
94
95 struct backing_dev_info backing_dev_info;
96
97#ifdef CONFIG_DEBUG_FS
98 struct dentry *debugfs_dentry_lru, *debugfs_caps;
99 struct dentry *debugfs_congestion_kb;
100 struct dentry *debugfs_bdi;
101 struct dentry *debugfs_mdsc, *debugfs_mdsmap;
102 struct dentry *debugfs_mds_sessions;
103#endif
104
105#ifdef CONFIG_CEPH_FSCACHE
106 struct fscache_cookie *fscache;
107#endif
108};
109
110
111/*
112 * File i/o capability. This tracks shared state with the metadata
113 * server that allows us to cache or writeback attributes or to read
114 * and write data. For any given inode, we should have one or more
115 * capabilities, one issued by each metadata server, and our
116 * cumulative access is the OR of all issued capabilities.
117 *
118 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
119 * session capability lists.
120 */
121struct ceph_cap {
122 struct ceph_inode_info *ci;
123 struct rb_node ci_node; /* per-ci cap tree */
124 struct ceph_mds_session *session;
125 struct list_head session_caps; /* per-session caplist */
126 u64 cap_id; /* unique cap id (mds provided) */
127 union {
128 /* in-use caps */
129 struct {
130 int issued; /* latest, from the mds */
131 int implemented; /* implemented superset of
132 issued (for revocation) */
133 int mds, mds_wanted;
134 };
135 /* caps to release */
136 struct {
137 u64 cap_ino;
138 int queue_release;
139 };
140 };
141 u32 seq, issue_seq, mseq;
142 u32 cap_gen; /* active/stale cycle */
143 unsigned long last_used;
144 struct list_head caps_item;
145};
146
147#define CHECK_CAPS_NODELAY 1 /* do not delay any further */
148#define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
149#define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
150
151struct ceph_cap_flush {
152 u64 tid;
153 int caps; /* 0 means capsnap */
154 bool wake; /* wake up flush waiters when finish ? */
155 struct list_head g_list; // global
156 struct list_head i_list; // per inode
157};
158
159/*
160 * Snapped cap state that is pending flush to mds. When a snapshot occurs,
161 * we first complete any in-process sync writes and writeback any dirty
162 * data before flushing the snapped state (tracked here) back to the MDS.
163 */
164struct ceph_cap_snap {
165 atomic_t nref;
166 struct list_head ci_item;
167
168 struct ceph_cap_flush cap_flush;
169
170 u64 follows;
171 int issued, dirty;
172 struct ceph_snap_context *context;
173
174 umode_t mode;
175 kuid_t uid;
176 kgid_t gid;
177
178 struct ceph_buffer *xattr_blob;
179 u64 xattr_version;
180
181 u64 size;
182 struct timespec mtime, atime, ctime;
183 u64 time_warp_seq;
184 u64 truncate_size;
185 u32 truncate_seq;
186 int writing; /* a sync write is still in progress */
187 int dirty_pages; /* dirty pages awaiting writeback */
188 bool inline_data;
189 bool need_flush;
190};
191
192static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
193{
194 if (atomic_dec_and_test(&capsnap->nref)) {
195 if (capsnap->xattr_blob)
196 ceph_buffer_put(capsnap->xattr_blob);
197 kfree(capsnap);
198 }
199}
200
201/*
202 * The frag tree describes how a directory is fragmented, potentially across
203 * multiple metadata servers. It is also used to indicate points where
204 * metadata authority is delegated, and whether/where metadata is replicated.
205 *
206 * A _leaf_ frag will be present in the i_fragtree IFF there is
207 * delegation info. That is, if mds >= 0 || ndist > 0.
208 */
209#define CEPH_MAX_DIRFRAG_REP 4
210
211struct ceph_inode_frag {
212 struct rb_node node;
213
214 /* fragtree state */
215 u32 frag;
216 int split_by; /* i.e. 2^(split_by) children */
217
218 /* delegation and replication info */
219 int mds; /* -1 if same authority as parent */
220 int ndist; /* >0 if replicated */
221 int dist[CEPH_MAX_DIRFRAG_REP];
222};
223
224/*
225 * We cache inode xattrs as an encoded blob until they are first used,
226 * at which point we parse them into an rbtree.
227 */
228struct ceph_inode_xattr {
229 struct rb_node node;
230
231 const char *name;
232 int name_len;
233 const char *val;
234 int val_len;
235 int dirty;
236
237 int should_free_name;
238 int should_free_val;
239};
240
241/*
242 * Ceph dentry state
243 */
244struct ceph_dentry_info {
245 struct ceph_mds_session *lease_session;
246 u32 lease_gen, lease_shared_gen;
247 u32 lease_seq;
248 unsigned long lease_renew_after, lease_renew_from;
249 struct list_head lru;
250 struct dentry *dentry;
251 unsigned long time;
252 u64 offset;
253};
254
255struct ceph_inode_xattrs_info {
256 /*
257 * (still encoded) xattr blob. we avoid the overhead of parsing
258 * this until someone actually calls getxattr, etc.
259 *
260 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
261 * NULL means we don't know.
262 */
263 struct ceph_buffer *blob, *prealloc_blob;
264
265 struct rb_root index;
266 bool dirty;
267 int count;
268 int names_size;
269 int vals_size;
270 u64 version, index_version;
271};
272
273/*
274 * Ceph inode.
275 */
276struct ceph_inode_info {
277 struct ceph_vino i_vino; /* ceph ino + snap */
278
279 spinlock_t i_ceph_lock;
280
281 u64 i_version;
282 u64 i_inline_version;
283 u32 i_time_warp_seq;
284
285 unsigned i_ceph_flags;
286 atomic64_t i_release_count;
287 atomic64_t i_ordered_count;
288 atomic64_t i_complete_seq[2];
289
290 struct ceph_dir_layout i_dir_layout;
291 struct ceph_file_layout i_layout;
292 char *i_symlink;
293
294 /* for dirs */
295 struct timespec i_rctime;
296 u64 i_rbytes, i_rfiles, i_rsubdirs;
297 u64 i_files, i_subdirs;
298
299 struct rb_root i_fragtree;
300 int i_fragtree_nsplits;
301 struct mutex i_fragtree_mutex;
302
303 struct ceph_inode_xattrs_info i_xattrs;
304
305 /* capabilities. protected _both_ by i_ceph_lock and cap->session's
306 * s_mutex. */
307 struct rb_root i_caps; /* cap list */
308 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
309 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
310 struct list_head i_dirty_item, i_flushing_item;
311 /* we need to track cap writeback on a per-cap-bit basis, to allow
312 * overlapping, pipelined cap flushes to the mds. we can probably
313 * reduce the tid to 8 bits if we're concerned about inode size. */
314 struct ceph_cap_flush *i_prealloc_cap_flush;
315 struct list_head i_cap_flush_list;
316 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
317 unsigned long i_hold_caps_min; /* jiffies */
318 unsigned long i_hold_caps_max; /* jiffies */
319 struct list_head i_cap_delay_list; /* for delayed cap release to mds */
320 struct ceph_cap_reservation i_cap_migration_resv;
321 struct list_head i_cap_snaps; /* snapped state pending flush to mds */
322 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or
323 dirty|flushing caps */
324 unsigned i_snap_caps; /* cap bits for snapped files */
325
326 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */
327
328 struct mutex i_truncate_mutex;
329 u32 i_truncate_seq; /* last truncate to smaller size */
330 u64 i_truncate_size; /* and the size we last truncated down to */
331 int i_truncate_pending; /* still need to call vmtruncate */
332
333 u64 i_max_size; /* max file size authorized by mds */
334 u64 i_reported_size; /* (max_)size reported to or requested of mds */
335 u64 i_wanted_max_size; /* offset we'd like to write too */
336 u64 i_requested_max_size; /* max_size we've requested */
337
338 /* held references to caps */
339 int i_pin_ref;
340 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
341 int i_wrbuffer_ref, i_wrbuffer_ref_head;
342 u32 i_shared_gen; /* increment each time we get FILE_SHARED */
343 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */
344 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
345
346 struct list_head i_unsafe_writes; /* uncommitted sync writes */
347 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
348 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */
349 spinlock_t i_unsafe_lock;
350
351 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
352 int i_snap_realm_counter; /* snap realm (if caps) */
353 struct list_head i_snap_realm_item;
354 struct list_head i_snap_flush_item;
355
356 struct work_struct i_wb_work; /* writeback work */
357 struct work_struct i_pg_inv_work; /* page invalidation work */
358
359 struct work_struct i_vmtruncate_work;
360
361#ifdef CONFIG_CEPH_FSCACHE
362 struct fscache_cookie *fscache;
363 u32 i_fscache_gen;
364#endif
365 struct inode vfs_inode; /* at end */
366};
367
368static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
369{
370 return container_of(inode, struct ceph_inode_info, vfs_inode);
371}
372
373static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
374{
375 return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
376}
377
378static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
379{
380 return (struct ceph_fs_client *)sb->s_fs_info;
381}
382
383static inline struct ceph_vino ceph_vino(struct inode *inode)
384{
385 return ceph_inode(inode)->i_vino;
386}
387
388/*
389 * ino_t is <64 bits on many architectures, blech.
390 *
391 * i_ino (kernel inode) st_ino (userspace)
392 * i386 32 32
393 * x86_64+ino32 64 32
394 * x86_64 64 64
395 */
396static inline u32 ceph_ino_to_ino32(__u64 vino)
397{
398 u32 ino = vino & 0xffffffff;
399 ino ^= vino >> 32;
400 if (!ino)
401 ino = 2;
402 return ino;
403}
404
405/*
406 * kernel i_ino value
407 */
408static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
409{
410#if BITS_PER_LONG == 32
411 return ceph_ino_to_ino32(vino.ino);
412#else
413 return (ino_t)vino.ino;
414#endif
415}
416
417/*
418 * user-visible ino (stat, filldir)
419 */
420#if BITS_PER_LONG == 32
421static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
422{
423 return ino;
424}
425#else
426static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
427{
428 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
429 ino = ceph_ino_to_ino32(ino);
430 return ino;
431}
432#endif
433
434
435/* for printf-style formatting */
436#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
437
438static inline u64 ceph_ino(struct inode *inode)
439{
440 return ceph_inode(inode)->i_vino.ino;
441}
442static inline u64 ceph_snap(struct inode *inode)
443{
444 return ceph_inode(inode)->i_vino.snap;
445}
446
447static inline int ceph_ino_compare(struct inode *inode, void *data)
448{
449 struct ceph_vino *pvino = (struct ceph_vino *)data;
450 struct ceph_inode_info *ci = ceph_inode(inode);
451 return ci->i_vino.ino == pvino->ino &&
452 ci->i_vino.snap == pvino->snap;
453}
454
455static inline struct inode *ceph_find_inode(struct super_block *sb,
456 struct ceph_vino vino)
457{
458 ino_t t = ceph_vino_to_ino(vino);
459 return ilookup5(sb, t, ceph_ino_compare, &vino);
460}
461
462
463/*
464 * Ceph inode.
465 */
466#define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */
467#define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */
468#define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */
469#define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */
470#define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */
471#define CEPH_I_POOL_RD (1 << 5) /* can read from pool */
472#define CEPH_I_POOL_WR (1 << 6) /* can write to pool */
473#define CEPH_I_SEC_INITED (1 << 7) /* security initialized */
474#define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */
475#define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */
476#define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */
477
478static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
479 long long release_count,
480 long long ordered_count)
481{
482 smp_mb__before_atomic();
483 atomic64_set(&ci->i_complete_seq[0], release_count);
484 atomic64_set(&ci->i_complete_seq[1], ordered_count);
485}
486
487static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
488{
489 atomic64_inc(&ci->i_release_count);
490}
491
492static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
493{
494 atomic64_inc(&ci->i_ordered_count);
495}
496
497static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
498{
499 return atomic64_read(&ci->i_complete_seq[0]) ==
500 atomic64_read(&ci->i_release_count);
501}
502
503static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
504{
505 return atomic64_read(&ci->i_complete_seq[0]) ==
506 atomic64_read(&ci->i_release_count) &&
507 atomic64_read(&ci->i_complete_seq[1]) ==
508 atomic64_read(&ci->i_ordered_count);
509}
510
511static inline void ceph_dir_clear_complete(struct inode *inode)
512{
513 __ceph_dir_clear_complete(ceph_inode(inode));
514}
515
516static inline void ceph_dir_clear_ordered(struct inode *inode)
517{
518 __ceph_dir_clear_ordered(ceph_inode(inode));
519}
520
521static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
522{
523 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
524 smp_rmb();
525 return ret;
526}
527
528/* find a specific frag @f */
529extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
530 u32 f);
531
532/*
533 * choose fragment for value @v. copy frag content to pfrag, if leaf
534 * exists
535 */
536extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
537 struct ceph_inode_frag *pfrag,
538 int *found);
539
540static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
541{
542 return (struct ceph_dentry_info *)dentry->d_fsdata;
543}
544
545/*
546 * caps helpers
547 */
548static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
549{
550 return !RB_EMPTY_ROOT(&ci->i_caps);
551}
552
553extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
554extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
555extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
556 struct ceph_cap *cap);
557
558static inline int ceph_caps_issued(struct ceph_inode_info *ci)
559{
560 int issued;
561 spin_lock(&ci->i_ceph_lock);
562 issued = __ceph_caps_issued(ci, NULL);
563 spin_unlock(&ci->i_ceph_lock);
564 return issued;
565}
566
567static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
568 int touch)
569{
570 int r;
571 spin_lock(&ci->i_ceph_lock);
572 r = __ceph_caps_issued_mask(ci, mask, touch);
573 spin_unlock(&ci->i_ceph_lock);
574 return r;
575}
576
577static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
578{
579 return ci->i_dirty_caps | ci->i_flushing_caps;
580}
581extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
582extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
583extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
584 struct ceph_cap_flush **pcf);
585
586extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
587 struct ceph_cap *ocap, int mask);
588extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
589extern int __ceph_caps_used(struct ceph_inode_info *ci);
590
591extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
592
593/*
594 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
595 */
596static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
597{
598 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
599 if (w & CEPH_CAP_FILE_BUFFER)
600 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
601 return w;
602}
603
604/* what the mds thinks we want */
605extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
606
607extern void ceph_caps_init(struct ceph_mds_client *mdsc);
608extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
609extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
610extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
611 struct ceph_cap_reservation *ctx, int need);
612extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
613 struct ceph_cap_reservation *ctx);
614extern void ceph_reservation_status(struct ceph_fs_client *client,
615 int *total, int *avail, int *used,
616 int *reserved, int *min);
617
618
619
620/*
621 * we keep buffered readdir results attached to file->private_data
622 */
623#define CEPH_F_SYNC 1
624#define CEPH_F_ATEND 2
625
626struct ceph_file_info {
627 short fmode; /* initialized on open */
628 short flags; /* CEPH_F_* */
629
630 /* readdir: position within the dir */
631 u32 frag;
632 struct ceph_mds_request *last_readdir;
633
634 /* readdir: position within a frag */
635 unsigned next_offset; /* offset of next chunk (last_name's + 1) */
636 char *last_name; /* last entry in previous chunk */
637 long long dir_release_count;
638 long long dir_ordered_count;
639 int readdir_cache_idx;
640
641 /* used for -o dirstat read() on directory thing */
642 char *dir_info;
643 int dir_info_len;
644};
645
646struct ceph_readdir_cache_control {
647 struct page *page;
648 struct dentry **dentries;
649 int index;
650};
651
652/*
653 * A "snap realm" describes a subset of the file hierarchy sharing
654 * the same set of snapshots that apply to it. The realms themselves
655 * are organized into a hierarchy, such that children inherit (some of)
656 * the snapshots of their parents.
657 *
658 * All inodes within the realm that have capabilities are linked into a
659 * per-realm list.
660 */
661struct ceph_snap_realm {
662 u64 ino;
663 atomic_t nref;
664 struct rb_node node;
665
666 u64 created, seq;
667 u64 parent_ino;
668 u64 parent_since; /* snapid when our current parent became so */
669
670 u64 *prior_parent_snaps; /* snaps inherited from any parents we */
671 u32 num_prior_parent_snaps; /* had prior to parent_since */
672 u64 *snaps; /* snaps specific to this realm */
673 u32 num_snaps;
674
675 struct ceph_snap_realm *parent;
676 struct list_head children; /* list of child realms */
677 struct list_head child_item;
678
679 struct list_head empty_item; /* if i have ref==0 */
680
681 struct list_head dirty_item; /* if realm needs new context */
682
683 /* the current set of snaps for this realm */
684 struct ceph_snap_context *cached_context;
685
686 struct list_head inodes_with_caps;
687 spinlock_t inodes_with_caps_lock;
688};
689
690static inline int default_congestion_kb(void)
691{
692 int congestion_kb;
693
694 /*
695 * Copied from NFS
696 *
697 * congestion size, scale with available memory.
698 *
699 * 64MB: 8192k
700 * 128MB: 11585k
701 * 256MB: 16384k
702 * 512MB: 23170k
703 * 1GB: 32768k
704 * 2GB: 46340k
705 * 4GB: 65536k
706 * 8GB: 92681k
707 * 16GB: 131072k
708 *
709 * This allows larger machines to have larger/more transfers.
710 * Limit the default to 256M
711 */
712 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
713 if (congestion_kb > 256*1024)
714 congestion_kb = 256*1024;
715
716 return congestion_kb;
717}
718
719
720
721/* snap.c */
722struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
723 u64 ino);
724extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
725 struct ceph_snap_realm *realm);
726extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
727 struct ceph_snap_realm *realm);
728extern int ceph_update_snap_trace(struct ceph_mds_client *m,
729 void *p, void *e, bool deletion,
730 struct ceph_snap_realm **realm_ret);
731extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
732 struct ceph_mds_session *session,
733 struct ceph_msg *msg);
734extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
735extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
736 struct ceph_cap_snap *capsnap);
737extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
738
739/*
740 * a cap_snap is "pending" if it is still awaiting an in-progress
741 * sync write (that may/may not still update size, mtime, etc.).
742 */
743static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
744{
745 return !list_empty(&ci->i_cap_snaps) &&
746 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
747 ci_item)->writing;
748}
749
750/* inode.c */
751extern const struct inode_operations ceph_file_iops;
752
753extern struct inode *ceph_alloc_inode(struct super_block *sb);
754extern void ceph_destroy_inode(struct inode *inode);
755extern int ceph_drop_inode(struct inode *inode);
756extern void ceph_evict_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);
775extern void __ceph_do_pending_vmtruncate(struct inode *inode);
776extern void ceph_queue_vmtruncate(struct inode *inode);
777
778extern void ceph_queue_invalidate(struct inode *inode);
779extern void ceph_queue_writeback(struct inode *inode);
780
781extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
782 int mask, bool force);
783static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
784{
785 return __ceph_do_getattr(inode, NULL, mask, force);
786}
787extern int ceph_permission(struct inode *inode, int mask);
788extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
789extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
790extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
791 struct kstat *stat);
792
793/* xattr.c */
794int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
795ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
796extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
797extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
798extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
799extern void __init ceph_xattr_init(void);
800extern void ceph_xattr_exit(void);
801extern const struct xattr_handler *ceph_xattr_handlers[];
802
803#ifdef CONFIG_SECURITY
804extern bool ceph_security_xattr_deadlock(struct inode *in);
805extern bool ceph_security_xattr_wanted(struct inode *in);
806#else
807static inline bool ceph_security_xattr_deadlock(struct inode *in)
808{
809 return false;
810}
811static inline bool ceph_security_xattr_wanted(struct inode *in)
812{
813 return false;
814}
815#endif
816
817/* acl.c */
818struct ceph_acls_info {
819 void *default_acl;
820 void *acl;
821 struct ceph_pagelist *pagelist;
822};
823
824#ifdef CONFIG_CEPH_FS_POSIX_ACL
825
826struct posix_acl *ceph_get_acl(struct inode *, int);
827int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
828int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
829 struct ceph_acls_info *info);
830void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
831void ceph_release_acls_info(struct ceph_acls_info *info);
832
833static inline void ceph_forget_all_cached_acls(struct inode *inode)
834{
835 forget_all_cached_acls(inode);
836}
837
838#else
839
840#define ceph_get_acl NULL
841#define ceph_set_acl NULL
842
843static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
844 struct ceph_acls_info *info)
845{
846 return 0;
847}
848static inline void ceph_init_inode_acls(struct inode *inode,
849 struct ceph_acls_info *info)
850{
851}
852static inline void ceph_release_acls_info(struct ceph_acls_info *info)
853{
854}
855static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
856{
857 return 0;
858}
859
860static inline void ceph_forget_all_cached_acls(struct inode *inode)
861{
862}
863
864#endif
865
866/* caps.c */
867extern const char *ceph_cap_string(int c);
868extern void ceph_handle_caps(struct ceph_mds_session *session,
869 struct ceph_msg *msg);
870extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
871 struct ceph_cap_reservation *ctx);
872extern void ceph_add_cap(struct inode *inode,
873 struct ceph_mds_session *session, u64 cap_id,
874 int fmode, unsigned issued, unsigned wanted,
875 unsigned cap, unsigned seq, u64 realmino, int flags,
876 struct ceph_cap **new_cap);
877extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
878extern void ceph_put_cap(struct ceph_mds_client *mdsc,
879 struct ceph_cap *cap);
880extern int ceph_is_any_caps(struct inode *inode);
881
882extern void ceph_queue_caps_release(struct inode *inode);
883extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
884extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
885 int datasync);
886extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
887 struct ceph_mds_session *session);
888extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
889 struct ceph_mds_session *session);
890extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
891 int mds);
892extern int ceph_get_cap_mds(struct inode *inode);
893extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
894extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
895extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
896 struct ceph_snap_context *snapc);
897extern void ceph_flush_snaps(struct ceph_inode_info *ci,
898 struct ceph_mds_session **psession);
899extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
900 struct ceph_mds_session *session);
901extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
902extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
903
904extern int ceph_encode_inode_release(void **p, struct inode *inode,
905 int mds, int drop, int unless, int force);
906extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
907 int mds, int drop, int unless);
908
909extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
910 loff_t endoff, int *got, struct page **pinned_page);
911extern int ceph_try_get_caps(struct ceph_inode_info *ci,
912 int need, int want, int *got);
913
914/* for counting open files by mode */
915extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode);
916extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
917
918/* addr.c */
919extern const struct address_space_operations ceph_aops;
920extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
921extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
922extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
923extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
924
925/* file.c */
926extern const struct file_operations ceph_file_fops;
927
928extern int ceph_renew_caps(struct inode *inode);
929extern int ceph_open(struct inode *inode, struct file *file);
930extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
931 struct file *file, unsigned flags, umode_t mode,
932 int *opened);
933extern int ceph_release(struct inode *inode, struct file *filp);
934extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
935 char *data, size_t len);
936extern void ceph_sync_write_wait(struct inode *inode);
937/* dir.c */
938extern const struct file_operations ceph_dir_fops;
939extern const struct file_operations ceph_snapdir_fops;
940extern const struct inode_operations ceph_dir_iops;
941extern const struct inode_operations ceph_snapdir_iops;
942extern const struct dentry_operations ceph_dentry_ops;
943
944extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order);
945extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
946extern int ceph_handle_snapdir(struct ceph_mds_request *req,
947 struct dentry *dentry, int err);
948extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
949 struct dentry *dentry, int err);
950
951extern void ceph_dentry_lru_add(struct dentry *dn);
952extern void ceph_dentry_lru_touch(struct dentry *dn);
953extern void ceph_dentry_lru_del(struct dentry *dn);
954extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
955extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
956extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
957
958/* ioctl.c */
959extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
960
961/* export.c */
962extern const struct export_operations ceph_export_ops;
963
964/* locks.c */
965extern __init void ceph_flock_init(void);
966extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
967extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
968extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
969extern int ceph_encode_locks_to_buffer(struct inode *inode,
970 struct ceph_filelock *flocks,
971 int num_fcntl_locks,
972 int num_flock_locks);
973extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
974 struct ceph_pagelist *pagelist,
975 int num_fcntl_locks, int num_flock_locks);
976extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
977
978/* debugfs.c */
979extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
980extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
981
982#endif /* _FS_CEPH_SUPER_H */