1#ifndef _FS_CEPH_SUPER_H
  2#define _FS_CEPH_SUPER_H
  3
  4#include <linux/ceph/ceph_debug.h>
  5
  6#include <asm/unaligned.h>
  7#include <linux/backing-dev.h>
  8#include <linux/completion.h>
  9#include <linux/exportfs.h>
 10#include <linux/fs.h>
 11#include <linux/mempool.h>
 12#include <linux/pagemap.h>
 13#include <linux/wait.h>
 14#include <linux/writeback.h>
 15#include <linux/slab.h>
 16#include <linux/posix_acl.h>
 
 
 17
 18#include <linux/ceph/libceph.h>
 19
 20#ifdef CONFIG_CEPH_FSCACHE
 21#include <linux/fscache.h>
 22#endif
 23
 24/* f_type in struct statfs */
 25#define CEPH_SUPER_MAGIC 0x00c36400
 26
 27/* large granularity for statfs utilization stats to facilitate
 28 * large volume sizes on 32-bit machines. */
 29#define CEPH_BLOCK_SHIFT   22  /* 4 MB */
 30#define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
 31
 
 32#define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
 33#define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
 34#define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
 35#define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
 36#define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
 37#define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
 38
 39#define CEPH_MOUNT_OPT_DEFAULT    (CEPH_MOUNT_OPT_RBYTES)
 
 
 
 
 
 
 40
 41#define ceph_set_mount_opt(fsc, opt) \
 42	(fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
 43#define ceph_test_mount_opt(fsc, opt) \
 44	(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
 45
 46#define CEPH_RSIZE_DEFAULT             0           /* max read size */
 47#define CEPH_RASIZE_DEFAULT            (8192*1024) /* readahead */
 
 
 
 
 48#define CEPH_MAX_READDIR_DEFAULT        1024
 49#define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
 50#define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
 51
 
 
 
 
 
 
 
 
 
 52struct ceph_mount_options {
 53	int flags;
 54	int sb_flags;
 55
 56	int wsize;            /* max write size */
 57	int rsize;            /* max read size */
 58	int rasize;           /* max readahead */
 59	int congestion_kb;    /* max writeback in flight */
 60	int caps_wanted_delay_min, caps_wanted_delay_max;
 61	int cap_release_safety;
 62	int max_readdir;       /* max readdir result (entires) */
 63	int max_readdir_bytes; /* max readdir result (bytes) */
 64
 65	/*
 66	 * everything above this point can be memcmp'd; everything below
 67	 * is handled in compare_mount_options()
 68	 */
 69
 70	char *snapdir_name;   /* default ".snap" */
 
 
 
 71};
 72
 73struct ceph_fs_client {
 74	struct super_block *sb;
 75
 76	struct ceph_mount_options *mount_options;
 77	struct ceph_client *client;
 78
 79	unsigned long mount_state;
 80	int min_caps;                  /* min caps i added */
 
 
 
 
 
 81
 82	struct ceph_mds_client *mdsc;
 83
 84	/* writeback */
 85	mempool_t *wb_pagevec_pool;
 86	struct workqueue_struct *wb_wq;
 87	struct workqueue_struct *pg_inv_wq;
 88	struct workqueue_struct *trunc_wq;
 89	atomic_long_t writeback_count;
 90
 91	struct backing_dev_info backing_dev_info;
 
 92
 93#ifdef CONFIG_DEBUG_FS
 94	struct dentry *debugfs_dentry_lru, *debugfs_caps;
 95	struct dentry *debugfs_congestion_kb;
 96	struct dentry *debugfs_bdi;
 97	struct dentry *debugfs_mdsc, *debugfs_mdsmap;
 
 98#endif
 99
100#ifdef CONFIG_CEPH_FSCACHE
101	struct fscache_cookie *fscache;
102	struct workqueue_struct *revalidate_wq;
103#endif
104};
105
106
107/*
108 * File i/o capability.  This tracks shared state with the metadata
109 * server that allows us to cache or writeback attributes or to read
110 * and write data.  For any given inode, we should have one or more
111 * capabilities, one issued by each metadata server, and our
112 * cumulative access is the OR of all issued capabilities.
113 *
114 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
115 * session capability lists.
116 */
117struct ceph_cap {
118	struct ceph_inode_info *ci;
119	struct rb_node ci_node;          /* per-ci cap tree */
120	struct ceph_mds_session *session;
121	struct list_head session_caps;   /* per-session caplist */
122	int mds;
123	u64 cap_id;       /* unique cap id (mds provided) */
124	int issued;       /* latest, from the mds */
125	int implemented;  /* implemented superset of issued (for revocation) */
126	int mds_wanted;
 
 
 
 
 
 
 
 
 
 
 
127	u32 seq, issue_seq, mseq;
128	u32 cap_gen;      /* active/stale cycle */
129	unsigned long last_used;
130	struct list_head caps_item;
131};
132
133#define CHECK_CAPS_NODELAY    1  /* do not delay any further */
134#define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
135#define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
136
 
 
 
 
 
 
 
 
137/*
138 * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
139 * we first complete any in-process sync writes and writeback any dirty
140 * data before flushing the snapped state (tracked here) back to the MDS.
141 */
142struct ceph_cap_snap {
143	atomic_t nref;
144	struct ceph_inode_info *ci;
145	struct list_head ci_item, flushing_item;
 
146
147	u64 follows, flush_tid;
148	int issued, dirty;
149	struct ceph_snap_context *context;
150
151	umode_t mode;
152	kuid_t uid;
153	kgid_t gid;
154
155	struct ceph_buffer *xattr_blob;
156	u64 xattr_version;
157
158	u64 size;
159	struct timespec mtime, atime, ctime;
 
160	u64 time_warp_seq;
 
 
161	int writing;   /* a sync write is still in progress */
162	int dirty_pages;     /* dirty pages awaiting writeback */
 
 
163};
164
165static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
166{
167	if (atomic_dec_and_test(&capsnap->nref)) {
168		if (capsnap->xattr_blob)
169			ceph_buffer_put(capsnap->xattr_blob);
170		kfree(capsnap);
171	}
172}
173
174/*
175 * The frag tree describes how a directory is fragmented, potentially across
176 * multiple metadata servers.  It is also used to indicate points where
177 * metadata authority is delegated, and whether/where metadata is replicated.
178 *
179 * A _leaf_ frag will be present in the i_fragtree IFF there is
180 * delegation info.  That is, if mds >= 0 || ndist > 0.
181 */
182#define CEPH_MAX_DIRFRAG_REP 4
183
184struct ceph_inode_frag {
185	struct rb_node node;
186
187	/* fragtree state */
188	u32 frag;
189	int split_by;         /* i.e. 2^(split_by) children */
190
191	/* delegation and replication info */
192	int mds;              /* -1 if same authority as parent */
193	int ndist;            /* >0 if replicated */
194	int dist[CEPH_MAX_DIRFRAG_REP];
195};
196
197/*
198 * We cache inode xattrs as an encoded blob until they are first used,
199 * at which point we parse them into an rbtree.
200 */
201struct ceph_inode_xattr {
202	struct rb_node node;
203
204	const char *name;
205	int name_len;
206	const char *val;
207	int val_len;
208	int dirty;
209
210	int should_free_name;
211	int should_free_val;
212};
213
214/*
215 * Ceph dentry state
216 */
217struct ceph_dentry_info {
 
218	struct ceph_mds_session *lease_session;
219	u32 lease_gen, lease_shared_gen;
 
 
 
220	u32 lease_seq;
221	unsigned long lease_renew_after, lease_renew_from;
222	struct list_head lru;
223	struct dentry *dentry;
224	u64 time;
225	u64 offset;
226};
227
 
 
 
 
228struct ceph_inode_xattrs_info {
229	/*
230	 * (still encoded) xattr blob. we avoid the overhead of parsing
231	 * this until someone actually calls getxattr, etc.
232	 *
233	 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
234	 * NULL means we don't know.
235	*/
236	struct ceph_buffer *blob, *prealloc_blob;
237
238	struct rb_root index;
239	bool dirty;
240	int count;
241	int names_size;
242	int vals_size;
243	u64 version, index_version;
244};
245
246/*
247 * Ceph inode.
248 */
249struct ceph_inode_info {
250	struct ceph_vino i_vino;   /* ceph ino + snap */
251
252	spinlock_t i_ceph_lock;
253
254	u64 i_version;
 
255	u32 i_time_warp_seq;
256
257	unsigned i_ceph_flags;
258	atomic_t i_release_count;
259	atomic_t i_complete_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
 
 
 
 
 
270	struct rb_root i_fragtree;
 
271	struct mutex i_fragtree_mutex;
272
273	struct ceph_inode_xattrs_info i_xattrs;
274
275	/* capabilities.  protected _both_ by i_ceph_lock and cap->session's
276	 * s_mutex. */
277	struct rb_root i_caps;           /* cap list */
278	struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
279	unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
280	struct list_head i_dirty_item, i_flushing_item;
281	u64 i_cap_flush_seq;
282	/* we need to track cap writeback on a per-cap-bit basis, to allow
283	 * overlapping, pipelined cap flushes to the mds.  we can probably
284	 * reduce the tid to 8 bits if we're concerned about inode size. */
285	u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
 
286	wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
287	unsigned long i_hold_caps_min; /* jiffies */
288	unsigned long i_hold_caps_max; /* jiffies */
289	struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
290	struct ceph_cap_reservation i_cap_migration_resv;
291	struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
292	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
293						    dirty|flushing caps */
294	unsigned i_snap_caps;           /* cap bits for snapped files */
295	unsigned i_cap_exporting_issued;
296
297	int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
298
299	struct mutex i_truncate_mutex;
300	u32 i_truncate_seq;        /* last truncate to smaller size */
301	u64 i_truncate_size;       /*  and the size we last truncated down to */
302	int i_truncate_pending;    /*  still need to call vmtruncate */
303
304	u64 i_max_size;            /* max file size authorized by mds */
305	u64 i_reported_size; /* (max_)size reported to or requested of mds */
306	u64 i_wanted_max_size;     /* offset we'd like to write too */
307	u64 i_requested_max_size;  /* max_size we've requested */
308
309	/* held references to caps */
310	int i_pin_ref;
311	int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
312	int i_wrbuffer_ref, i_wrbuffer_ref_head;
313	u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 
314	u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
315	u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
316
317	struct list_head i_unsafe_writes; /* uncommitted sync writes */
318	struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 
319	spinlock_t i_unsafe_lock;
320
321	struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
 
 
 
322	int i_snap_realm_counter; /* snap realm (if caps) */
323	struct list_head i_snap_realm_item;
324	struct list_head i_snap_flush_item;
 
 
325
326	struct work_struct i_wb_work;  /* writeback work */
327	struct work_struct i_pg_inv_work;  /* page invalidation work */
328
329	struct work_struct i_vmtruncate_work;
330
331#ifdef CONFIG_CEPH_FSCACHE
332	struct fscache_cookie *fscache;
333	u32 i_fscache_gen; /* sequence, for delayed fscache validate */
334	struct work_struct i_revalidate_work;
335#endif
 
 
336	struct inode vfs_inode; /* at end */
337};
338
339static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
340{
341	return container_of(inode, struct ceph_inode_info, vfs_inode);
342}
343
344static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
345{
346	return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
347}
348
349static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
350{
351	return (struct ceph_fs_client *)sb->s_fs_info;
352}
353
354static inline struct ceph_vino ceph_vino(struct inode *inode)
355{
356	return ceph_inode(inode)->i_vino;
357}
358
359/*
360 * ino_t is <64 bits on many architectures, blech.
361 *
362 *               i_ino (kernel inode)   st_ino (userspace)
363 * i386          32                     32
364 * x86_64+ino32  64                     32
365 * x86_64        64                     64
366 */
367static inline u32 ceph_ino_to_ino32(__u64 vino)
368{
369	u32 ino = vino & 0xffffffff;
370	ino ^= vino >> 32;
371	if (!ino)
372		ino = 2;
373	return ino;
374}
375
376/*
377 * kernel i_ino value
378 */
379static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
380{
381#if BITS_PER_LONG == 32
382	return ceph_ino_to_ino32(vino.ino);
383#else
384	return (ino_t)vino.ino;
385#endif
386}
387
388/*
389 * user-visible ino (stat, filldir)
390 */
391#if BITS_PER_LONG == 32
392static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
393{
394	return ino;
395}
396#else
397static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
398{
399	if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
400		ino = ceph_ino_to_ino32(ino);
401	return ino;
402}
403#endif
404
405
406/* for printf-style formatting */
407#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
408
409static inline u64 ceph_ino(struct inode *inode)
410{
411	return ceph_inode(inode)->i_vino.ino;
412}
413static inline u64 ceph_snap(struct inode *inode)
414{
415	return ceph_inode(inode)->i_vino.snap;
416}
417
418static inline int ceph_ino_compare(struct inode *inode, void *data)
419{
420	struct ceph_vino *pvino = (struct ceph_vino *)data;
421	struct ceph_inode_info *ci = ceph_inode(inode);
422	return ci->i_vino.ino == pvino->ino &&
423		ci->i_vino.snap == pvino->snap;
424}
425
426static inline struct inode *ceph_find_inode(struct super_block *sb,
427					    struct ceph_vino vino)
428{
429	ino_t t = ceph_vino_to_ino(vino);
430	return ilookup5(sb, t, ceph_ino_compare, &vino);
431}
432
433
434/*
435 * Ceph inode.
436 */
437#define CEPH_I_NODELAY   4  /* do not delay cap release */
438#define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
439#define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
440
441static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
442					   int release_count)
 
443{
444	atomic_set(&ci->i_complete_count, release_count);
 
 
 
 
 
 
 
445}
446
447static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
448{
449	atomic_inc(&ci->i_release_count);
 
 
 
 
 
450}
451
452static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
453{
454	return atomic_read(&ci->i_complete_count) ==
455		atomic_read(&ci->i_release_count);
 
 
 
 
 
 
 
 
456}
457
458static inline void ceph_dir_clear_complete(struct inode *inode)
459{
460	__ceph_dir_clear_complete(ceph_inode(inode));
461}
462
463static inline bool ceph_dir_is_complete(struct inode *inode)
464{
465	return __ceph_dir_is_complete(ceph_inode(inode));
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 * caps helpers
493 */
494static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
495{
496	return !RB_EMPTY_ROOT(&ci->i_caps);
497}
498
499extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
500extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
501extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
502				    struct ceph_cap *cap);
503
504static inline int ceph_caps_issued(struct ceph_inode_info *ci)
505{
506	int issued;
507	spin_lock(&ci->i_ceph_lock);
508	issued = __ceph_caps_issued(ci, NULL);
509	spin_unlock(&ci->i_ceph_lock);
510	return issued;
511}
512
513static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
514					int touch)
515{
516	int r;
517	spin_lock(&ci->i_ceph_lock);
518	r = __ceph_caps_issued_mask(ci, mask, touch);
519	spin_unlock(&ci->i_ceph_lock);
520	return r;
521}
522
523static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
524{
525	return ci->i_dirty_caps | ci->i_flushing_caps;
526}
527extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
 
 
 
528
529extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
530				      struct ceph_cap *ocap, int mask);
531extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
532extern int __ceph_caps_used(struct ceph_inode_info *ci);
533
534extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
535
536/*
537 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
538 */
539static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
540{
541	int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
542	if (w & CEPH_CAP_FILE_BUFFER)
543		w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
544	return w;
545}
546
547/* what the mds thinks we want */
548extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
549
550extern void ceph_caps_init(struct ceph_mds_client *mdsc);
551extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
552extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
553extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
 
554			     struct ceph_cap_reservation *ctx, int need);
555extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
556			       struct ceph_cap_reservation *ctx);
557extern void ceph_reservation_status(struct ceph_fs_client *client,
558				    int *total, int *avail, int *used,
559				    int *reserved, int *min);
560
561
562
563/*
564 * we keep buffered readdir results attached to file->private_data
565 */
566#define CEPH_F_SYNC     1
567#define CEPH_F_ATEND    2
568
569struct ceph_file_info {
570	short fmode;     /* initialized on open */
571	short flags;     /* CEPH_F_* */
572
 
 
 
 
 
 
 
 
 
 
 
573	/* readdir: position within the dir */
574	u32 frag;
575	struct ceph_mds_request *last_readdir;
576
577	/* readdir: position within a frag */
578	unsigned offset;       /* offset of last chunk, adjusted for . and .. */
579	unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
580	char *last_name;       /* last entry in previous chunk */
581	struct dentry *dentry; /* next dentry (for dcache readdir) */
582	int dir_release_count;
 
583
584	/* used for -o dirstat read() on directory thing */
585	char *dir_info;
586	int dir_info_len;
587};
588
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
589
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
590
591/*
592 * A "snap realm" describes a subset of the file hierarchy sharing
593 * the same set of snapshots that apply to it.  The realms themselves
594 * are organized into a hierarchy, such that children inherit (some of)
595 * the snapshots of their parents.
596 *
597 * All inodes within the realm that have capabilities are linked into a
598 * per-realm list.
599 */
600struct ceph_snap_realm {
601	u64 ino;
 
602	atomic_t nref;
603	struct rb_node node;
604
605	u64 created, seq;
606	u64 parent_ino;
607	u64 parent_since;   /* snapid when our current parent became so */
608
609	u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
610	u32 num_prior_parent_snaps;   /*  had prior to parent_since */
611	u64 *snaps;                   /* snaps specific to this realm */
612	u32 num_snaps;
613
614	struct ceph_snap_realm *parent;
615	struct list_head children;       /* list of child realms */
616	struct list_head child_item;
617
618	struct list_head empty_item;     /* if i have ref==0 */
619
620	struct list_head dirty_item;     /* if realm needs new context */
621
622	/* the current set of snaps for this realm */
623	struct ceph_snap_context *cached_context;
624
625	struct list_head inodes_with_caps;
626	spinlock_t inodes_with_caps_lock;
627};
628
629static inline int default_congestion_kb(void)
630{
631	int congestion_kb;
632
633	/*
634	 * Copied from NFS
635	 *
636	 * congestion size, scale with available memory.
637	 *
638	 *  64MB:    8192k
639	 * 128MB:   11585k
640	 * 256MB:   16384k
641	 * 512MB:   23170k
642	 *   1GB:   32768k
643	 *   2GB:   46340k
644	 *   4GB:   65536k
645	 *   8GB:   92681k
646	 *  16GB:  131072k
647	 *
648	 * This allows larger machines to have larger/more transfers.
649	 * Limit the default to 256M
650	 */
651	congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
652	if (congestion_kb > 256*1024)
653		congestion_kb = 256*1024;
654
655	return congestion_kb;
656}
657
658
659
 
660/* snap.c */
661struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
662					       u64 ino);
663extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
664				struct ceph_snap_realm *realm);
665extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
666				struct ceph_snap_realm *realm);
667extern int ceph_update_snap_trace(struct ceph_mds_client *m,
668				  void *p, void *e, bool deletion);
 
669extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
670			     struct ceph_mds_session *session,
671			     struct ceph_msg *msg);
672extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
673extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
674				  struct ceph_cap_snap *capsnap);
675extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
676
 
 
 
 
 
 
 
 
677/*
678 * a cap_snap is "pending" if it is still awaiting an in-progress
679 * sync write (that may/may not still update size, mtime, etc.).
680 */
681static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
682{
683	return !list_empty(&ci->i_cap_snaps) &&
684		list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
685			   ci_item)->writing;
686}
687
688/* inode.c */
689extern const struct inode_operations ceph_file_iops;
690
691extern struct inode *ceph_alloc_inode(struct super_block *sb);
692extern void ceph_destroy_inode(struct inode *inode);
693extern int ceph_drop_inode(struct inode *inode);
694
695extern struct inode *ceph_get_inode(struct super_block *sb,
696				    struct ceph_vino vino);
697extern struct inode *ceph_get_snapdir(struct inode *parent);
698extern int ceph_fill_file_size(struct inode *inode, int issued,
699			       u32 truncate_seq, u64 truncate_size, u64 size);
700extern void ceph_fill_file_time(struct inode *inode, int issued,
701				u64 time_warp_seq, struct timespec *ctime,
702				struct timespec *mtime, struct timespec *atime);
 
703extern int ceph_fill_trace(struct super_block *sb,
704			   struct ceph_mds_request *req,
705			   struct ceph_mds_session *session);
706extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
707				    struct ceph_mds_session *session);
708
709extern int ceph_inode_holds_cap(struct inode *inode, int mask);
710
711extern int ceph_inode_set_size(struct inode *inode, loff_t size);
712extern void __ceph_do_pending_vmtruncate(struct inode *inode);
713extern void ceph_queue_vmtruncate(struct inode *inode);
714
715extern void ceph_queue_invalidate(struct inode *inode);
716extern void ceph_queue_writeback(struct inode *inode);
 
717
718extern int ceph_do_getattr(struct inode *inode, int mask);
 
 
 
 
 
719extern int ceph_permission(struct inode *inode, int mask);
 
720extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
721extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
722			struct kstat *stat);
723
724/* xattr.c */
725extern int ceph_setxattr(struct dentry *, const char *, const void *,
726			 size_t, int);
727int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
728ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
729int __ceph_removexattr(struct dentry *, const char *);
730extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
731extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
732extern int ceph_removexattr(struct dentry *, const char *);
733extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
734extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
735extern void __init ceph_xattr_init(void);
736extern void ceph_xattr_exit(void);
737
738/* acl.c */
739extern const struct xattr_handler *ceph_xattr_handlers[];
740
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
741#ifdef CONFIG_CEPH_FS_POSIX_ACL
742
743struct posix_acl *ceph_get_acl(struct inode *, int);
744int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
745int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
 
 
 
746
747static inline void ceph_forget_all_cached_acls(struct inode *inode)
748{
749       forget_all_cached_acls(inode);
750}
751
752#else
753
754#define ceph_get_acl NULL
755#define ceph_set_acl NULL
756
757static inline int ceph_init_acl(struct dentry *dentry, struct inode *inode,
758				struct inode *dir)
759{
760	return 0;
761}
762
 
 
 
763static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
764{
765	return 0;
766}
767
768static inline void ceph_forget_all_cached_acls(struct inode *inode)
769{
770}
771
772#endif
773
774/* caps.c */
775extern const char *ceph_cap_string(int c);
776extern void ceph_handle_caps(struct ceph_mds_session *session,
777			     struct ceph_msg *msg);
778extern int ceph_add_cap(struct inode *inode,
779			struct ceph_mds_session *session, u64 cap_id,
780			int fmode, unsigned issued, unsigned wanted,
781			unsigned cap, unsigned seq, u64 realmino, int flags,
782			struct ceph_cap_reservation *caps_reservation);
 
 
783extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 
784extern void ceph_put_cap(struct ceph_mds_client *mdsc,
785			 struct ceph_cap *cap);
786extern int ceph_is_any_caps(struct inode *inode);
787
788extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino,
789				u64 cap_id, u32 migrate_seq, u32 issue_seq);
790extern void ceph_queue_caps_release(struct inode *inode);
791extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
792extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
793		      int datasync);
 
 
794extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
795				    struct ceph_mds_session *session);
796extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
797					     int mds);
798extern int ceph_get_cap_mds(struct inode *inode);
799extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
800extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
801extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
802				       struct ceph_snap_context *snapc);
803extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
804			       struct ceph_mds_session **psession,
805			       int again);
806extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
807			    struct ceph_mds_session *session);
808extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
809extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
810
811extern int ceph_encode_inode_release(void **p, struct inode *inode,
812				     int mds, int drop, int unless, int force);
813extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 
814				      int mds, int drop, int unless);
815
816extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
817			 int *got, loff_t endoff);
 
 
818
819/* for counting open files by mode */
820static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
821{
822	ci->i_nr_by_mode[mode]++;
823}
824extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
825
826/* addr.c */
827extern const struct address_space_operations ceph_aops;
828extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 
 
 
829
830/* file.c */
831extern const struct file_operations ceph_file_fops;
832extern const struct address_space_operations ceph_aops;
833
 
834extern int ceph_open(struct inode *inode, struct file *file);
835extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
836			    struct file *file, unsigned flags, umode_t mode,
837			    int *opened);
838extern int ceph_release(struct inode *inode, struct file *filp);
 
 
839
840/* dir.c */
841extern const struct file_operations ceph_dir_fops;
 
842extern const struct inode_operations ceph_dir_iops;
843extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
844	ceph_snapdir_dentry_ops;
845
 
846extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
847extern int ceph_handle_snapdir(struct ceph_mds_request *req,
848			       struct dentry *dentry, int err);
849extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
850					 struct dentry *dentry, int err);
851
852extern void ceph_dentry_lru_add(struct dentry *dn);
853extern void ceph_dentry_lru_touch(struct dentry *dn);
854extern void ceph_dentry_lru_del(struct dentry *dn);
855extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 
856extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
857extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
858
859/*
860 * our d_ops vary depending on whether the inode is live,
861 * snapshotted (read-only), or a virtual ".snap" directory.
862 */
863int ceph_init_dentry(struct dentry *dentry);
864
865
866/* ioctl.c */
867extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
868
869/* export.c */
870extern const struct export_operations ceph_export_ops;
 
871
872/* locks.c */
873extern __init void ceph_flock_init(void);
874extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
875extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
876extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
877extern int ceph_encode_locks_to_buffer(struct inode *inode,
878				       struct ceph_filelock *flocks,
879				       int num_fcntl_locks,
880				       int num_flock_locks);
881extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
882				  struct ceph_pagelist *pagelist,
883				  int num_fcntl_locks, int num_flock_locks);
884extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
885
886/* debugfs.c */
887extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
888extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
889
890#endif /* _FS_CEPH_SUPER_H */