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 */