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
 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             (512*1024) /* readahead */
 
 
 
 
 
 40#define CEPH_MAX_READDIR_DEFAULT        1024
 41#define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
 42#define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
 43
 
 
 
 
 
 
 
 
 
 44struct ceph_mount_options {
 45	int flags;
 46	int sb_flags;
 
 
 
 
 
 
 
 
 47
 48	int wsize;
 49	int rsize;            /* max readahead */
 50	int congestion_kb;    /* max writeback in flight */
 51	int caps_wanted_delay_min, caps_wanted_delay_max;
 52	int cap_release_safety;
 53	int max_readdir;       /* max readdir result (entires) */
 54	int max_readdir_bytes; /* max readdir result (bytes) */
 55
 56	/*
 57	 * everything above this point can be memcmp'd; everything below
 58	 * is handled in compare_mount_options()
 59	 */
 60
 61	char *snapdir_name;   /* default ".snap" */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 62};
 63
 
 
 64struct ceph_fs_client {
 65	struct super_block *sb;
 66
 
 
 67	struct ceph_mount_options *mount_options;
 68	struct ceph_client *client;
 69
 70	unsigned long mount_state;
 71	int min_caps;                  /* min caps i added */
 
 
 
 
 
 
 72
 73	struct ceph_mds_client *mdsc;
 74
 75	/* writeback */
 76	mempool_t *wb_pagevec_pool;
 77	struct workqueue_struct *wb_wq;
 78	struct workqueue_struct *pg_inv_wq;
 79	struct workqueue_struct *trunc_wq;
 80	atomic_long_t writeback_count;
 
 
 
 
 81
 82	struct backing_dev_info backing_dev_info;
 
 83
 84#ifdef CONFIG_DEBUG_FS
 85	struct dentry *debugfs_dentry_lru, *debugfs_caps;
 86	struct dentry *debugfs_congestion_kb;
 87	struct dentry *debugfs_bdi;
 88	struct dentry *debugfs_mdsc, *debugfs_mdsmap;
 
 
 
 89#endif
 90};
 91
 
 
 
 
 
 
 
 92
 93/*
 94 * File i/o capability.  This tracks shared state with the metadata
 95 * server that allows us to cache or writeback attributes or to read
 96 * and write data.  For any given inode, we should have one or more
 97 * capabilities, one issued by each metadata server, and our
 98 * cumulative access is the OR of all issued capabilities.
 99 *
100 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
101 * session capability lists.
102 */
103struct ceph_cap {
104	struct ceph_inode_info *ci;
105	struct rb_node ci_node;          /* per-ci cap tree */
106	struct ceph_mds_session *session;
107	struct list_head session_caps;   /* per-session caplist */
108	int mds;
109	u64 cap_id;       /* unique cap id (mds provided) */
110	int issued;       /* latest, from the mds */
111	int implemented;  /* implemented superset of issued (for revocation) */
112	int mds_wanted;
 
 
 
 
 
 
 
 
 
 
 
 
113	u32 seq, issue_seq, mseq;
114	u32 cap_gen;      /* active/stale cycle */
115	unsigned long last_used;
116	struct list_head caps_item;
117};
118
119#define CHECK_CAPS_NODELAY    1  /* do not delay any further */
120#define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
121#define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
 
 
 
 
 
 
 
 
 
 
122
123/*
124 * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
125 * we first complete any in-process sync writes and writeback any dirty
126 * data before flushing the snapped state (tracked here) back to the MDS.
127 */
128struct ceph_cap_snap {
129	atomic_t nref;
130	struct ceph_inode_info *ci;
131	struct list_head ci_item, flushing_item;
132
133	u64 follows, flush_tid;
 
 
134	int issued, dirty;
135	struct ceph_snap_context *context;
136
137	mode_t mode;
138	uid_t uid;
139	gid_t gid;
140
141	struct ceph_buffer *xattr_blob;
142	u64 xattr_version;
143
144	u64 size;
145	struct timespec mtime, atime, ctime;
 
146	u64 time_warp_seq;
 
 
147	int writing;   /* a sync write is still in progress */
148	int dirty_pages;     /* dirty pages awaiting writeback */
 
 
149};
150
151static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
152{
153	if (atomic_dec_and_test(&capsnap->nref)) {
154		if (capsnap->xattr_blob)
155			ceph_buffer_put(capsnap->xattr_blob);
156		kfree(capsnap);
157	}
158}
159
160/*
161 * The frag tree describes how a directory is fragmented, potentially across
162 * multiple metadata servers.  It is also used to indicate points where
163 * metadata authority is delegated, and whether/where metadata is replicated.
164 *
165 * A _leaf_ frag will be present in the i_fragtree IFF there is
166 * delegation info.  That is, if mds >= 0 || ndist > 0.
167 */
168#define CEPH_MAX_DIRFRAG_REP 4
169
170struct ceph_inode_frag {
171	struct rb_node node;
172
173	/* fragtree state */
174	u32 frag;
175	int split_by;         /* i.e. 2^(split_by) children */
176
177	/* delegation and replication info */
178	int mds;              /* -1 if same authority as parent */
179	int ndist;            /* >0 if replicated */
180	int dist[CEPH_MAX_DIRFRAG_REP];
181};
182
183/*
184 * We cache inode xattrs as an encoded blob until they are first used,
185 * at which point we parse them into an rbtree.
186 */
187struct ceph_inode_xattr {
188	struct rb_node node;
189
190	const char *name;
191	int name_len;
192	const char *val;
193	int val_len;
194	int dirty;
195
196	int should_free_name;
197	int should_free_val;
198};
199
200/*
201 * Ceph dentry state
202 */
203struct ceph_dentry_info {
 
204	struct ceph_mds_session *lease_session;
205	u32 lease_gen, lease_shared_gen;
 
 
 
 
206	u32 lease_seq;
207	unsigned long lease_renew_after, lease_renew_from;
208	struct list_head lru;
209	struct dentry *dentry;
210	u64 time;
211	u64 offset;
212};
213
 
 
 
 
 
 
 
 
 
214struct ceph_inode_xattrs_info {
215	/*
216	 * (still encoded) xattr blob. we avoid the overhead of parsing
217	 * this until someone actually calls getxattr, etc.
218	 *
219	 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
220	 * NULL means we don't know.
221	*/
222	struct ceph_buffer *blob, *prealloc_blob;
223
224	struct rb_root index;
225	bool dirty;
226	int count;
227	int names_size;
228	int vals_size;
229	u64 version, index_version;
230};
231
232/*
233 * Ceph inode.
234 */
235struct ceph_inode_info {
 
236	struct ceph_vino i_vino;   /* ceph ino + snap */
237
 
 
238	u64 i_version;
 
239	u32 i_time_warp_seq;
240
241	unsigned i_ceph_flags;
242	unsigned long i_release_count;
 
 
243
244	struct ceph_dir_layout i_dir_layout;
245	struct ceph_file_layout i_layout;
 
246	char *i_symlink;
247
248	/* for dirs */
249	struct timespec i_rctime;
250	u64 i_rbytes, i_rfiles, i_rsubdirs;
251	u64 i_files, i_subdirs;
252	u64 i_max_offset;  /* largest readdir offset, set with I_COMPLETE */
 
 
 
 
253
254	struct rb_root i_fragtree;
 
255	struct mutex i_fragtree_mutex;
256
257	struct ceph_inode_xattrs_info i_xattrs;
258
259	/* capabilities.  protected _both_ by i_lock and cap->session's
260	 * s_mutex. */
261	struct rb_root i_caps;           /* cap list */
262	struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
263	unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
264	struct list_head i_dirty_item, i_flushing_item;
265	u64 i_cap_flush_seq;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
266	/* we need to track cap writeback on a per-cap-bit basis, to allow
267	 * overlapping, pipelined cap flushes to the mds.  we can probably
268	 * reduce the tid to 8 bits if we're concerned about inode size. */
269	u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
 
270	wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
271	unsigned long i_hold_caps_min; /* jiffies */
272	unsigned long i_hold_caps_max; /* jiffies */
273	struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
274	int i_cap_exporting_mds;         /* to handle cap migration between */
275	unsigned i_cap_exporting_mseq;   /*  mds's. */
276	unsigned i_cap_exporting_issued;
277	struct ceph_cap_reservation i_cap_migration_resv;
278	struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
279	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
280						    dirty|flushing caps */
281	unsigned i_snap_caps;           /* cap bits for snapped files */
282
283	int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
 
 
284
 
285	u32 i_truncate_seq;        /* last truncate to smaller size */
286	u64 i_truncate_size;       /*  and the size we last truncated down to */
287	int i_truncate_pending;    /*  still need to call vmtruncate */
 
 
 
 
 
288
289	u64 i_max_size;            /* max file size authorized by mds */
290	u64 i_reported_size; /* (max_)size reported to or requested of mds */
291	u64 i_wanted_max_size;     /* offset we'd like to write too */
292	u64 i_requested_max_size;  /* max_size we've requested */
293
294	/* held references to caps */
295	int i_pin_ref;
296	int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
297	int i_wrbuffer_ref, i_wrbuffer_ref_head;
298	u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
 
299	u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
300	u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
301
302	struct list_head i_unsafe_writes; /* uncommitted sync writes */
303	struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
 
304	spinlock_t i_unsafe_lock;
305
306	struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
307	int i_snap_realm_counter; /* snap realm (if caps) */
 
 
308	struct list_head i_snap_realm_item;
309	struct list_head i_snap_flush_item;
 
 
310
311	struct work_struct i_wb_work;  /* writeback work */
312	struct work_struct i_pg_inv_work;  /* page invalidation work */
313
314	struct work_struct i_vmtruncate_work;
 
 
 
 
 
 
 
 
 
315
316	struct inode vfs_inode; /* at end */
 
 
 
 
 
 
 
317};
318
319static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
 
320{
321	return container_of(inode, struct ceph_inode_info, vfs_inode);
322}
323
324static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
 
325{
326	return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
327}
328
329static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
 
330{
331	return (struct ceph_fs_client *)sb->s_fs_info;
332}
333
334static inline struct ceph_vino ceph_vino(struct inode *inode)
 
335{
336	return ceph_inode(inode)->i_vino;
337}
338
339/*
340 * ino_t is <64 bits on many architectures, blech.
341 *
342 *               i_ino (kernel inode)   st_ino (userspace)
343 * i386          32                     32
344 * x86_64+ino32  64                     32
345 * x86_64        64                     64
346 */
347static inline u32 ceph_ino_to_ino32(ino_t ino)
348{
349	ino ^= ino >> (sizeof(ino) * 8 - 32);
350	if (!ino)
351		ino = 1;
352	return ino;
353}
354
355/*
356 * kernel i_ino value
357 */
358static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
359{
360	ino_t ino = (ino_t)vino.ino;  /* ^ (vino.snap << 20); */
361#if BITS_PER_LONG == 32
362	ino = ceph_ino_to_ino32(ino);
363#endif
364	return ino;
365}
366
367/*
368 * user-visible ino (stat, filldir)
369 */
370#if BITS_PER_LONG == 32
371static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
372{
 
 
 
 
373	return ino;
374}
375#else
376static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
 
 
 
 
 
 
377{
378	if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
379		ino = ceph_ino_to_ino32(ino);
380	return ino;
381}
382#endif
383
384
385/* for printf-style formatting */
386#define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
387
388static inline u64 ceph_ino(struct inode *inode)
389{
390	return ceph_inode(inode)->i_vino.ino;
391}
 
392static inline u64 ceph_snap(struct inode *inode)
393{
394	return ceph_inode(inode)->i_vino.snap;
395}
396
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
397static inline int ceph_ino_compare(struct inode *inode, void *data)
398{
399	struct ceph_vino *pvino = (struct ceph_vino *)data;
400	struct ceph_inode_info *ci = ceph_inode(inode);
401	return ci->i_vino.ino == pvino->ino &&
402		ci->i_vino.snap == pvino->snap;
403}
404
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
405static inline struct inode *ceph_find_inode(struct super_block *sb,
406					    struct ceph_vino vino)
407{
408	ino_t t = ceph_vino_to_ino(vino);
409	return ilookup5(sb, t, ceph_ino_compare, &vino);
 
 
 
 
 
 
 
410}
411
412
413/*
414 * Ceph inode.
415 */
416#define CEPH_I_COMPLETE  1  /* we have complete directory cached */
417#define CEPH_I_NODELAY   4  /* do not delay cap release */
418#define CEPH_I_FLUSH     8  /* do not delay flush of dirty metadata */
419#define CEPH_I_NOFLUSH  16  /* do not flush dirty caps */
 
 
 
 
 
 
 
 
 
 
 
 
420
421static inline void ceph_i_clear(struct inode *inode, unsigned mask)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
422{
423	struct ceph_inode_info *ci = ceph_inode(inode);
 
 
 
 
 
424
425	spin_lock(&inode->i_lock);
426	ci->i_ceph_flags &= ~mask;
427	spin_unlock(&inode->i_lock);
 
 
 
 
428}
429
430static inline void ceph_i_set(struct inode *inode, unsigned mask)
 
 
431{
432	struct ceph_inode_info *ci = ceph_inode(inode);
 
 
 
 
 
 
 
 
433
434	spin_lock(&inode->i_lock);
435	ci->i_ceph_flags |= mask;
436	spin_unlock(&inode->i_lock);
437}
438
439static inline bool ceph_i_test(struct inode *inode, unsigned mask)
440{
441	struct ceph_inode_info *ci = ceph_inode(inode);
442	bool r;
443
444	spin_lock(&inode->i_lock);
445	r = (ci->i_ceph_flags & mask) == mask;
446	spin_unlock(&inode->i_lock);
447	return r;
448}
449
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
450
451/* find a specific frag @f */
452extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
453						u32 f);
454
455/*
456 * choose fragment for value @v.  copy frag content to pfrag, if leaf
457 * exists
458 */
459extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
460			    struct ceph_inode_frag *pfrag,
461			    int *found);
462
463static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
464{
465	return (struct ceph_dentry_info *)dentry->d_fsdata;
466}
467
468static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
469{
470	return ((loff_t)frag << 32) | (loff_t)off;
471}
472
473/*
474 * caps helpers
475 */
476static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
477{
478	return !RB_EMPTY_ROOT(&ci->i_caps);
479}
480
481extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
482extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
 
 
483extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
484				    struct ceph_cap *cap);
485
486static inline int ceph_caps_issued(struct ceph_inode_info *ci)
487{
488	int issued;
489	spin_lock(&ci->vfs_inode.i_lock);
490	issued = __ceph_caps_issued(ci, NULL);
491	spin_unlock(&ci->vfs_inode.i_lock);
492	return issued;
493}
494
495static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
496					int touch)
497{
498	int r;
499	spin_lock(&ci->vfs_inode.i_lock);
500	r = __ceph_caps_issued_mask(ci, mask, touch);
501	spin_unlock(&ci->vfs_inode.i_lock);
502	return r;
503}
504
505static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
506{
507	return ci->i_dirty_caps | ci->i_flushing_caps;
508}
509extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
 
 
 
510
511extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
 
512extern int __ceph_caps_used(struct ceph_inode_info *ci);
513
514extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
515
516/*
517 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
518 */
519static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
520{
521	int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
522	if (w & CEPH_CAP_FILE_BUFFER)
523		w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
524	return w;
525}
 
 
526
527/* what the mds thinks we want */
528extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
529
530extern void ceph_caps_init(struct ceph_mds_client *mdsc);
531extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
532extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
 
533extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
534			     struct ceph_cap_reservation *ctx, int need);
535extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
536			       struct ceph_cap_reservation *ctx);
537extern void ceph_reservation_status(struct ceph_fs_client *client,
538				    int *total, int *avail, int *used,
539				    int *reserved, int *min);
 
 
540
541
542
543/*
544 * we keep buffered readdir results attached to file->private_data
545 */
546#define CEPH_F_SYNC     1
547#define CEPH_F_ATEND    2
548
549struct ceph_file_info {
550	short fmode;     /* initialized on open */
551	short flags;     /* CEPH_F_* */
552
 
 
 
 
 
 
 
 
 
553	/* readdir: position within the dir */
554	u32 frag;
555	struct ceph_mds_request *last_readdir;
556
557	/* readdir: position within a frag */
558	unsigned offset;       /* offset of last chunk, adjusted for . and .. */
559	u64 next_offset;       /* offset of next chunk (last_name's + 1) */
560	char *last_name;       /* last entry in previous chunk */
561	struct dentry *dentry; /* next dentry (for dcache readdir) */
562	unsigned long dir_release_count;
 
563
564	/* used for -o dirstat read() on directory thing */
565	char *dir_info;
566	int dir_info_len;
567};
568
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
569
 
 
 
 
 
570
571/*
572 * A "snap realm" describes a subset of the file hierarchy sharing
573 * the same set of snapshots that apply to it.  The realms themselves
574 * are organized into a hierarchy, such that children inherit (some of)
575 * the snapshots of their parents.
576 *
577 * All inodes within the realm that have capabilities are linked into a
578 * per-realm list.
579 */
580struct ceph_snap_realm {
581	u64 ino;
 
582	atomic_t nref;
583	struct rb_node node;
584
585	u64 created, seq;
586	u64 parent_ino;
587	u64 parent_since;   /* snapid when our current parent became so */
588
589	u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
590	int num_prior_parent_snaps;   /*  had prior to parent_since */
591	u64 *snaps;                   /* snaps specific to this realm */
592	int num_snaps;
593
594	struct ceph_snap_realm *parent;
595	struct list_head children;       /* list of child realms */
596	struct list_head child_item;
597
598	struct list_head empty_item;     /* if i have ref==0 */
599
600	struct list_head dirty_item;     /* if realm needs new context */
601
 
 
602	/* the current set of snaps for this realm */
603	struct ceph_snap_context *cached_context;
604
605	struct list_head inodes_with_caps;
606	spinlock_t inodes_with_caps_lock;
607};
608
609static inline int default_congestion_kb(void)
610{
611	int congestion_kb;
612
613	/*
614	 * Copied from NFS
615	 *
616	 * congestion size, scale with available memory.
617	 *
618	 *  64MB:    8192k
619	 * 128MB:   11585k
620	 * 256MB:   16384k
621	 * 512MB:   23170k
622	 *   1GB:   32768k
623	 *   2GB:   46340k
624	 *   4GB:   65536k
625	 *   8GB:   92681k
626	 *  16GB:  131072k
627	 *
628	 * This allows larger machines to have larger/more transfers.
629	 * Limit the default to 256M
630	 */
631	congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
632	if (congestion_kb > 256*1024)
633		congestion_kb = 256*1024;
634
635	return congestion_kb;
636}
637
638
639
 
640/* snap.c */
641struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
642					       u64 ino);
643extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
644				struct ceph_snap_realm *realm);
645extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
646				struct ceph_snap_realm *realm);
647extern int ceph_update_snap_trace(struct ceph_mds_client *m,
648				  void *p, void *e, bool deletion);
 
 
649extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
650			     struct ceph_mds_session *session,
651			     struct ceph_msg *msg);
652extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
653extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
654				  struct ceph_cap_snap *capsnap);
655extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
 
 
 
 
 
 
 
 
 
656
657/*
658 * a cap_snap is "pending" if it is still awaiting an in-progress
659 * sync write (that may/may not still update size, mtime, etc.).
660 */
661static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
662{
663	return !list_empty(&ci->i_cap_snaps) &&
664		list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
665			   ci_item)->writing;
666}
667
668/* inode.c */
 
 
 
 
669extern const struct inode_operations ceph_file_iops;
670
671extern struct inode *ceph_alloc_inode(struct super_block *sb);
672extern void ceph_destroy_inode(struct inode *inode);
 
 
 
 
 
 
673
674extern struct inode *ceph_get_inode(struct super_block *sb,
675				    struct ceph_vino vino);
 
676extern struct inode *ceph_get_snapdir(struct inode *parent);
677extern int ceph_fill_file_size(struct inode *inode, int issued,
678			       u32 truncate_seq, u64 truncate_size, u64 size);
679extern void ceph_fill_file_time(struct inode *inode, int issued,
680				u64 time_warp_seq, struct timespec *ctime,
681				struct timespec *mtime, struct timespec *atime);
 
 
 
 
 
 
682extern int ceph_fill_trace(struct super_block *sb,
683			   struct ceph_mds_request *req,
684			   struct ceph_mds_session *session);
685extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
686				    struct ceph_mds_session *session);
687
688extern int ceph_inode_holds_cap(struct inode *inode, int mask);
689
690extern int ceph_inode_set_size(struct inode *inode, loff_t size);
691extern void __ceph_do_pending_vmtruncate(struct inode *inode);
692extern void ceph_queue_vmtruncate(struct inode *inode);
693
694extern void ceph_queue_invalidate(struct inode *inode);
695extern void ceph_queue_writeback(struct inode *inode);
696
697extern int ceph_do_getattr(struct inode *inode, int mask);
698extern int ceph_permission(struct inode *inode, int mask);
699extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
700extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
701			struct kstat *stat);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
702
703/* xattr.c */
704extern int ceph_setxattr(struct dentry *, const char *, const void *,
705			 size_t, int);
706extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
707extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
708extern int ceph_removexattr(struct dentry *, const char *);
709extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
710extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
711
712/* caps.c */
713extern const char *ceph_cap_string(int c);
714extern void ceph_handle_caps(struct ceph_mds_session *session,
715			     struct ceph_msg *msg);
716extern int ceph_add_cap(struct inode *inode,
717			struct ceph_mds_session *session, u64 cap_id,
718			int fmode, unsigned issued, unsigned wanted,
719			unsigned cap, unsigned seq, u64 realmino, int flags,
720			struct ceph_cap_reservation *caps_reservation);
721extern void __ceph_remove_cap(struct ceph_cap *cap);
722static inline void ceph_remove_cap(struct ceph_cap *cap)
723{
724	struct inode *inode = &cap->ci->vfs_inode;
725	spin_lock(&inode->i_lock);
726	__ceph_remove_cap(cap);
727	spin_unlock(&inode->i_lock);
728}
729extern void ceph_put_cap(struct ceph_mds_client *mdsc,
730			 struct ceph_cap *cap);
 
731
732extern void ceph_queue_caps_release(struct inode *inode);
733extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
734extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
735		      int datasync);
 
 
736extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
737				    struct ceph_mds_session *session);
 
 
 
 
738extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
739					     int mds);
740extern int ceph_get_cap_mds(struct inode *inode);
 
741extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
742extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
 
743extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
744				       struct ceph_snap_context *snapc);
745extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
746			       struct ceph_mds_session **psession,
747			       int again);
748extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
749			    struct ceph_mds_session *session);
750extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
 
 
 
 
 
751extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
752
 
753extern int ceph_encode_inode_release(void **p, struct inode *inode,
754				     int mds, int drop, int unless, int force);
755extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
 
756				      int mds, int drop, int unless);
757
758extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
759			 int *got, loff_t endoff);
 
 
 
 
760
761/* for counting open files by mode */
762static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
763{
764	ci->i_nr_by_mode[mode]++;
765}
766extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
767
768/* addr.c */
769extern const struct address_space_operations ceph_aops;
 
770extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
 
 
 
 
 
 
 
 
 
 
 
 
771
772/* file.c */
773extern const struct file_operations ceph_file_fops;
774extern const struct address_space_operations ceph_aops;
775extern int ceph_copy_to_page_vector(struct page **pages,
776				    const char *data,
777				    loff_t off, size_t len);
778extern int ceph_copy_from_page_vector(struct page **pages,
779				    char *data,
780				    loff_t off, size_t len);
781extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
782extern int ceph_open(struct inode *inode, struct file *file);
783extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
784				       struct nameidata *nd, int mode,
785				       int locked_dir);
 
 
786extern int ceph_release(struct inode *inode, struct file *filp);
 
 
787
788/* dir.c */
789extern const struct file_operations ceph_dir_fops;
 
790extern const struct inode_operations ceph_dir_iops;
791extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
792	ceph_snapdir_dentry_ops;
793
 
794extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
795extern int ceph_handle_snapdir(struct ceph_mds_request *req,
796			       struct dentry *dentry, int err);
797extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
798					 struct dentry *dentry, int err);
799
800extern void ceph_dentry_lru_add(struct dentry *dn);
801extern void ceph_dentry_lru_touch(struct dentry *dn);
802extern void ceph_dentry_lru_del(struct dentry *dn);
803extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 
804extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
805extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry);
806
807/*
808 * our d_ops vary depending on whether the inode is live,
809 * snapshotted (read-only), or a virtual ".snap" directory.
810 */
811int ceph_init_dentry(struct dentry *dentry);
812
813
814/* ioctl.c */
815extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
816
817/* export.c */
818extern const struct export_operations ceph_export_ops;
 
819
820/* locks.c */
 
821extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
822extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
823extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
824extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p,
825			     int p_locks, int f_locks);
826extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
 
 
 
 
827
828/* debugfs.c */
829extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
830extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
831
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
832#endif /* _FS_CEPH_SUPER_H */