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

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