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TOMOYO Linux Cross Reference
Linux/fs/ceph/super.h

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

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