• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_SUPER_H
3 #define _FS_CEPH_SUPER_H
4 
5 #include <linux/ceph/ceph_debug.h>
6 
7 #include <asm/unaligned.h>
8 #include <linux/backing-dev.h>
9 #include <linux/completion.h>
10 #include <linux/exportfs.h>
11 #include <linux/fs.h>
12 #include <linux/mempool.h>
13 #include <linux/pagemap.h>
14 #include <linux/wait.h>
15 #include <linux/writeback.h>
16 #include <linux/slab.h>
17 #include <linux/posix_acl.h>
18 #include <linux/refcount.h>
19 
20 #include <linux/ceph/libceph.h>
21 
22 #ifdef CONFIG_CEPH_FSCACHE
23 #include <linux/fscache.h>
24 #endif
25 
26 /* f_type in struct statfs */
27 #define CEPH_SUPER_MAGIC 0x00c36400
28 
29 /* large granularity for statfs utilization stats to facilitate
30  * large volume sizes on 32-bit machines. */
31 #define CEPH_BLOCK_SHIFT   22  /* 4 MB */
32 #define CEPH_BLOCK         (1 << CEPH_BLOCK_SHIFT)
33 
34 #define CEPH_MOUNT_OPT_DIRSTAT         (1<<4) /* `cat dirname` for stats */
35 #define CEPH_MOUNT_OPT_RBYTES          (1<<5) /* dir st_bytes = rbytes */
36 #define CEPH_MOUNT_OPT_NOASYNCREADDIR  (1<<7) /* no dcache readdir */
37 #define CEPH_MOUNT_OPT_INO32           (1<<8) /* 32 bit inos */
38 #define CEPH_MOUNT_OPT_DCACHE          (1<<9) /* use dcache for readdir etc */
39 #define CEPH_MOUNT_OPT_FSCACHE         (1<<10) /* use fscache */
40 #define CEPH_MOUNT_OPT_NOPOOLPERM      (1<<11) /* no pool permission check */
41 #define CEPH_MOUNT_OPT_MOUNTWAIT       (1<<12) /* mount waits if no mds is up */
42 
43 #define CEPH_MOUNT_OPT_DEFAULT    CEPH_MOUNT_OPT_DCACHE
44 
45 #define ceph_set_mount_opt(fsc, opt) \
46 	(fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
47 #define ceph_test_mount_opt(fsc, opt) \
48 	(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
49 
50 /* max size of osd read request, limited by libceph */
51 #define CEPH_MAX_READ_SIZE              CEPH_MSG_MAX_DATA_LEN
52 /* osd has a configurable limitaion of max write size.
53  * CEPH_MSG_MAX_DATA_LEN should be small enough. */
54 #define CEPH_MAX_WRITE_SIZE		CEPH_MSG_MAX_DATA_LEN
55 #define CEPH_RASIZE_DEFAULT             (8192*1024)    /* max readahead */
56 #define CEPH_MAX_READDIR_DEFAULT        1024
57 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
58 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
59 
60 /*
61  * Delay telling the MDS we no longer want caps, in case we reopen
62  * the file.  Delay a minimum amount of time, even if we send a cap
63  * message for some other reason.  Otherwise, take the oppotunity to
64  * update the mds to avoid sending another message later.
65  */
66 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT      5  /* cap release delay */
67 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT     60  /* cap release delay */
68 
69 struct ceph_mount_options {
70 	int flags;
71 	int sb_flags;
72 
73 	int wsize;            /* max write size */
74 	int rsize;            /* max read size */
75 	int rasize;           /* max readahead */
76 	int congestion_kb;    /* max writeback in flight */
77 	int caps_wanted_delay_min, caps_wanted_delay_max;
78 	int max_readdir;       /* max readdir result (entires) */
79 	int max_readdir_bytes; /* max readdir result (bytes) */
80 
81 	/*
82 	 * everything above this point can be memcmp'd; everything below
83 	 * is handled in compare_mount_options()
84 	 */
85 
86 	char *snapdir_name;   /* default ".snap" */
87 	char *mds_namespace;  /* default NULL */
88 	char *server_path;    /* default  "/" */
89 	char *fscache_uniq;   /* default NULL */
90 };
91 
92 struct ceph_fs_client {
93 	struct super_block *sb;
94 
95 	struct ceph_mount_options *mount_options;
96 	struct ceph_client *client;
97 
98 	unsigned long mount_state;
99 	int min_caps;                  /* min caps i added */
100 
101 	struct ceph_mds_client *mdsc;
102 
103 	/* writeback */
104 	mempool_t *wb_pagevec_pool;
105 	struct workqueue_struct *wb_wq;
106 	struct workqueue_struct *pg_inv_wq;
107 	struct workqueue_struct *trunc_wq;
108 	atomic_long_t writeback_count;
109 
110 #ifdef CONFIG_DEBUG_FS
111 	struct dentry *debugfs_dentry_lru, *debugfs_caps;
112 	struct dentry *debugfs_congestion_kb;
113 	struct dentry *debugfs_bdi;
114 	struct dentry *debugfs_mdsc, *debugfs_mdsmap;
115 	struct dentry *debugfs_mds_sessions;
116 #endif
117 
118 #ifdef CONFIG_CEPH_FSCACHE
119 	struct fscache_cookie *fscache;
120 #endif
121 };
122 
123 
124 /*
125  * File i/o capability.  This tracks shared state with the metadata
126  * server that allows us to cache or writeback attributes or to read
127  * and write data.  For any given inode, we should have one or more
128  * capabilities, one issued by each metadata server, and our
129  * cumulative access is the OR of all issued capabilities.
130  *
131  * Each cap is referenced by the inode's i_caps rbtree and by per-mds
132  * session capability lists.
133  */
134 struct ceph_cap {
135 	struct ceph_inode_info *ci;
136 	struct rb_node ci_node;          /* per-ci cap tree */
137 	struct ceph_mds_session *session;
138 	struct list_head session_caps;   /* per-session caplist */
139 	u64 cap_id;       /* unique cap id (mds provided) */
140 	union {
141 		/* in-use caps */
142 		struct {
143 			int issued;       /* latest, from the mds */
144 			int implemented;  /* implemented superset of
145 					     issued (for revocation) */
146 			int mds, mds_wanted;
147 		};
148 		/* caps to release */
149 		struct {
150 			u64 cap_ino;
151 			int queue_release;
152 		};
153 	};
154 	u32 seq, issue_seq, mseq;
155 	u32 cap_gen;      /* active/stale cycle */
156 	unsigned long last_used;
157 	struct list_head caps_item;
158 };
159 
160 #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
161 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
162 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
163 
164 struct ceph_cap_flush {
165 	u64 tid;
166 	int caps; /* 0 means capsnap */
167 	bool wake; /* wake up flush waiters when finish ? */
168 	struct list_head g_list; // global
169 	struct list_head i_list; // per inode
170 };
171 
172 /*
173  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
174  * we first complete any in-process sync writes and writeback any dirty
175  * data before flushing the snapped state (tracked here) back to the MDS.
176  */
177 struct ceph_cap_snap {
178 	refcount_t nref;
179 	struct list_head ci_item;
180 
181 	struct ceph_cap_flush cap_flush;
182 
183 	u64 follows;
184 	int issued, dirty;
185 	struct ceph_snap_context *context;
186 
187 	umode_t mode;
188 	kuid_t uid;
189 	kgid_t gid;
190 
191 	struct ceph_buffer *xattr_blob;
192 	u64 xattr_version;
193 
194 	u64 size;
195 	struct timespec mtime, atime, ctime;
196 	u64 time_warp_seq;
197 	u64 truncate_size;
198 	u32 truncate_seq;
199 	int writing;   /* a sync write is still in progress */
200 	int dirty_pages;     /* dirty pages awaiting writeback */
201 	bool inline_data;
202 	bool need_flush;
203 };
204 
ceph_put_cap_snap(struct ceph_cap_snap * capsnap)205 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
206 {
207 	if (refcount_dec_and_test(&capsnap->nref)) {
208 		if (capsnap->xattr_blob)
209 			ceph_buffer_put(capsnap->xattr_blob);
210 		kfree(capsnap);
211 	}
212 }
213 
214 /*
215  * The frag tree describes how a directory is fragmented, potentially across
216  * multiple metadata servers.  It is also used to indicate points where
217  * metadata authority is delegated, and whether/where metadata is replicated.
218  *
219  * A _leaf_ frag will be present in the i_fragtree IFF there is
220  * delegation info.  That is, if mds >= 0 || ndist > 0.
221  */
222 #define CEPH_MAX_DIRFRAG_REP 4
223 
224 struct ceph_inode_frag {
225 	struct rb_node node;
226 
227 	/* fragtree state */
228 	u32 frag;
229 	int split_by;         /* i.e. 2^(split_by) children */
230 
231 	/* delegation and replication info */
232 	int mds;              /* -1 if same authority as parent */
233 	int ndist;            /* >0 if replicated */
234 	int dist[CEPH_MAX_DIRFRAG_REP];
235 };
236 
237 /*
238  * We cache inode xattrs as an encoded blob until they are first used,
239  * at which point we parse them into an rbtree.
240  */
241 struct ceph_inode_xattr {
242 	struct rb_node node;
243 
244 	const char *name;
245 	int name_len;
246 	const char *val;
247 	int val_len;
248 	int dirty;
249 
250 	int should_free_name;
251 	int should_free_val;
252 };
253 
254 /*
255  * Ceph dentry state
256  */
257 struct ceph_dentry_info {
258 	struct ceph_mds_session *lease_session;
259 	u32 lease_gen, lease_shared_gen;
260 	u32 lease_seq;
261 	unsigned long lease_renew_after, lease_renew_from;
262 	struct list_head lru;
263 	struct dentry *dentry;
264 	unsigned long time;
265 	u64 offset;
266 };
267 
268 struct ceph_inode_xattrs_info {
269 	/*
270 	 * (still encoded) xattr blob. we avoid the overhead of parsing
271 	 * this until someone actually calls getxattr, etc.
272 	 *
273 	 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
274 	 * NULL means we don't know.
275 	*/
276 	struct ceph_buffer *blob, *prealloc_blob;
277 
278 	struct rb_root index;
279 	bool dirty;
280 	int count;
281 	int names_size;
282 	int vals_size;
283 	u64 version, index_version;
284 };
285 
286 /*
287  * Ceph inode.
288  */
289 struct ceph_inode_info {
290 	struct ceph_vino i_vino;   /* ceph ino + snap */
291 
292 	spinlock_t i_ceph_lock;
293 
294 	u64 i_version;
295 	u64 i_inline_version;
296 	u32 i_time_warp_seq;
297 
298 	unsigned i_ceph_flags;
299 	atomic64_t i_release_count;
300 	atomic64_t i_ordered_count;
301 	atomic64_t i_complete_seq[2];
302 
303 	struct ceph_dir_layout i_dir_layout;
304 	struct ceph_file_layout i_layout;
305 	char *i_symlink;
306 
307 	/* for dirs */
308 	struct timespec i_rctime;
309 	u64 i_rbytes, i_rfiles, i_rsubdirs;
310 	u64 i_files, i_subdirs;
311 
312 	struct rb_root i_fragtree;
313 	int i_fragtree_nsplits;
314 	struct mutex i_fragtree_mutex;
315 
316 	struct ceph_inode_xattrs_info i_xattrs;
317 
318 	/* capabilities.  protected _both_ by i_ceph_lock and cap->session's
319 	 * s_mutex. */
320 	struct rb_root i_caps;           /* cap list */
321 	struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
322 	unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
323 	struct list_head i_dirty_item, i_flushing_item;
324 	/* we need to track cap writeback on a per-cap-bit basis, to allow
325 	 * overlapping, pipelined cap flushes to the mds.  we can probably
326 	 * reduce the tid to 8 bits if we're concerned about inode size. */
327 	struct ceph_cap_flush *i_prealloc_cap_flush;
328 	struct list_head i_cap_flush_list;
329 	wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
330 	unsigned long i_hold_caps_min; /* jiffies */
331 	unsigned long i_hold_caps_max; /* jiffies */
332 	struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
333 	struct ceph_cap_reservation i_cap_migration_resv;
334 	struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
335 	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
336 						    dirty|flushing caps */
337 	unsigned i_snap_caps;           /* cap bits for snapped files */
338 
339 	int i_nr_by_mode[CEPH_FILE_MODE_BITS];  /* open file counts */
340 
341 	struct mutex i_truncate_mutex;
342 	u32 i_truncate_seq;        /* last truncate to smaller size */
343 	u64 i_truncate_size;       /*  and the size we last truncated down to */
344 	int i_truncate_pending;    /*  still need to call vmtruncate */
345 
346 	u64 i_max_size;            /* max file size authorized by mds */
347 	u64 i_reported_size; /* (max_)size reported to or requested of mds */
348 	u64 i_wanted_max_size;     /* offset we'd like to write too */
349 	u64 i_requested_max_size;  /* max_size we've requested */
350 
351 	/* held references to caps */
352 	int i_pin_ref;
353 	int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
354 	int i_wrbuffer_ref, i_wrbuffer_ref_head;
355 	u32 i_shared_gen;       /* increment each time we get FILE_SHARED */
356 	u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
357 	u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
358 
359 	struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
360 	struct list_head i_unsafe_iops;   /* uncommitted mds inode ops */
361 	spinlock_t i_unsafe_lock;
362 
363 	struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
364 	int i_snap_realm_counter; /* snap realm (if caps) */
365 	struct list_head i_snap_realm_item;
366 	struct list_head i_snap_flush_item;
367 
368 	struct work_struct i_wb_work;  /* writeback work */
369 	struct work_struct i_pg_inv_work;  /* page invalidation work */
370 
371 	struct work_struct i_vmtruncate_work;
372 
373 #ifdef CONFIG_CEPH_FSCACHE
374 	struct fscache_cookie *fscache;
375 	u32 i_fscache_gen;
376 #endif
377 	struct inode vfs_inode; /* at end */
378 };
379 
ceph_inode(struct inode * inode)380 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
381 {
382 	return container_of(inode, struct ceph_inode_info, vfs_inode);
383 }
384 
ceph_inode_to_client(struct inode * inode)385 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
386 {
387 	return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
388 }
389 
ceph_sb_to_client(struct super_block * sb)390 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
391 {
392 	return (struct ceph_fs_client *)sb->s_fs_info;
393 }
394 
ceph_vino(struct inode * inode)395 static inline struct ceph_vino ceph_vino(struct inode *inode)
396 {
397 	return ceph_inode(inode)->i_vino;
398 }
399 
400 /*
401  * ino_t is <64 bits on many architectures, blech.
402  *
403  *               i_ino (kernel inode)   st_ino (userspace)
404  * i386          32                     32
405  * x86_64+ino32  64                     32
406  * x86_64        64                     64
407  */
ceph_ino_to_ino32(__u64 vino)408 static inline u32 ceph_ino_to_ino32(__u64 vino)
409 {
410 	u32 ino = vino & 0xffffffff;
411 	ino ^= vino >> 32;
412 	if (!ino)
413 		ino = 2;
414 	return ino;
415 }
416 
417 /*
418  * kernel i_ino value
419  */
ceph_vino_to_ino(struct ceph_vino vino)420 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
421 {
422 #if BITS_PER_LONG == 32
423 	return ceph_ino_to_ino32(vino.ino);
424 #else
425 	return (ino_t)vino.ino;
426 #endif
427 }
428 
429 /*
430  * user-visible ino (stat, filldir)
431  */
432 #if BITS_PER_LONG == 32
ceph_translate_ino(struct super_block * sb,ino_t ino)433 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
434 {
435 	return ino;
436 }
437 #else
ceph_translate_ino(struct super_block * sb,ino_t ino)438 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
439 {
440 	if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
441 		ino = ceph_ino_to_ino32(ino);
442 	return ino;
443 }
444 #endif
445 
446 
447 /* for printf-style formatting */
448 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
449 
ceph_ino(struct inode * inode)450 static inline u64 ceph_ino(struct inode *inode)
451 {
452 	return ceph_inode(inode)->i_vino.ino;
453 }
ceph_snap(struct inode * inode)454 static inline u64 ceph_snap(struct inode *inode)
455 {
456 	return ceph_inode(inode)->i_vino.snap;
457 }
458 
ceph_ino_compare(struct inode * inode,void * data)459 static inline int ceph_ino_compare(struct inode *inode, void *data)
460 {
461 	struct ceph_vino *pvino = (struct ceph_vino *)data;
462 	struct ceph_inode_info *ci = ceph_inode(inode);
463 	return ci->i_vino.ino == pvino->ino &&
464 		ci->i_vino.snap == pvino->snap;
465 }
466 
ceph_find_inode(struct super_block * sb,struct ceph_vino vino)467 static inline struct inode *ceph_find_inode(struct super_block *sb,
468 					    struct ceph_vino vino)
469 {
470 	ino_t t = ceph_vino_to_ino(vino);
471 	return ilookup5(sb, t, ceph_ino_compare, &vino);
472 }
473 
474 
475 /*
476  * Ceph inode.
477  */
478 #define CEPH_I_DIR_ORDERED	(1 << 0)  /* dentries in dir are ordered */
479 #define CEPH_I_NODELAY		(1 << 1)  /* do not delay cap release */
480 #define CEPH_I_FLUSH		(1 << 2)  /* do not delay flush of dirty metadata */
481 #define CEPH_I_NOFLUSH		(1 << 3)  /* do not flush dirty caps */
482 #define CEPH_I_POOL_PERM	(1 << 4)  /* pool rd/wr bits are valid */
483 #define CEPH_I_POOL_RD		(1 << 5)  /* can read from pool */
484 #define CEPH_I_POOL_WR		(1 << 6)  /* can write to pool */
485 #define CEPH_I_SEC_INITED	(1 << 7)  /* security initialized */
486 #define CEPH_I_CAP_DROPPED	(1 << 8)  /* caps were forcibly dropped */
487 #define CEPH_I_KICK_FLUSH	(1 << 9)  /* kick flushing caps */
488 #define CEPH_I_FLUSH_SNAPS	(1 << 10) /* need flush snapss */
489 #define CEPH_I_ERROR_WRITE	(1 << 11) /* have seen write errors */
490 
491 /*
492  * We set the ERROR_WRITE bit when we start seeing write errors on an inode
493  * and then clear it when they start succeeding. Note that we do a lockless
494  * check first, and only take the lock if it looks like it needs to be changed.
495  * The write submission code just takes this as a hint, so we're not too
496  * worried if a few slip through in either direction.
497  */
ceph_set_error_write(struct ceph_inode_info * ci)498 static inline void ceph_set_error_write(struct ceph_inode_info *ci)
499 {
500 	if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) {
501 		spin_lock(&ci->i_ceph_lock);
502 		ci->i_ceph_flags |= CEPH_I_ERROR_WRITE;
503 		spin_unlock(&ci->i_ceph_lock);
504 	}
505 }
506 
ceph_clear_error_write(struct ceph_inode_info * ci)507 static inline void ceph_clear_error_write(struct ceph_inode_info *ci)
508 {
509 	if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) {
510 		spin_lock(&ci->i_ceph_lock);
511 		ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE;
512 		spin_unlock(&ci->i_ceph_lock);
513 	}
514 }
515 
__ceph_dir_set_complete(struct ceph_inode_info * ci,long long release_count,long long ordered_count)516 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
517 					   long long release_count,
518 					   long long ordered_count)
519 {
520 	/*
521 	 * Makes sure operations that setup readdir cache (update page
522 	 * cache and i_size) are strongly ordered w.r.t. the following
523 	 * atomic64_set() operations.
524 	 */
525 	smp_mb();
526 	atomic64_set(&ci->i_complete_seq[0], release_count);
527 	atomic64_set(&ci->i_complete_seq[1], ordered_count);
528 }
529 
__ceph_dir_clear_complete(struct ceph_inode_info * ci)530 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
531 {
532 	atomic64_inc(&ci->i_release_count);
533 }
534 
__ceph_dir_clear_ordered(struct ceph_inode_info * ci)535 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
536 {
537 	atomic64_inc(&ci->i_ordered_count);
538 }
539 
__ceph_dir_is_complete(struct ceph_inode_info * ci)540 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
541 {
542 	return atomic64_read(&ci->i_complete_seq[0]) ==
543 		atomic64_read(&ci->i_release_count);
544 }
545 
__ceph_dir_is_complete_ordered(struct ceph_inode_info * ci)546 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
547 {
548 	return  atomic64_read(&ci->i_complete_seq[0]) ==
549 		atomic64_read(&ci->i_release_count) &&
550 		atomic64_read(&ci->i_complete_seq[1]) ==
551 		atomic64_read(&ci->i_ordered_count);
552 }
553 
ceph_dir_clear_complete(struct inode * inode)554 static inline void ceph_dir_clear_complete(struct inode *inode)
555 {
556 	__ceph_dir_clear_complete(ceph_inode(inode));
557 }
558 
ceph_dir_clear_ordered(struct inode * inode)559 static inline void ceph_dir_clear_ordered(struct inode *inode)
560 {
561 	__ceph_dir_clear_ordered(ceph_inode(inode));
562 }
563 
ceph_dir_is_complete_ordered(struct inode * inode)564 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
565 {
566 	bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
567 	smp_rmb();
568 	return ret;
569 }
570 
571 /* find a specific frag @f */
572 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
573 						u32 f);
574 
575 /*
576  * choose fragment for value @v.  copy frag content to pfrag, if leaf
577  * exists
578  */
579 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
580 			    struct ceph_inode_frag *pfrag,
581 			    int *found);
582 
ceph_dentry(struct dentry * dentry)583 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
584 {
585 	return (struct ceph_dentry_info *)dentry->d_fsdata;
586 }
587 
588 /*
589  * caps helpers
590  */
__ceph_is_any_real_caps(struct ceph_inode_info * ci)591 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
592 {
593 	return !RB_EMPTY_ROOT(&ci->i_caps);
594 }
595 
596 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
597 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
598 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
599 				    struct ceph_cap *cap);
600 
ceph_caps_issued(struct ceph_inode_info * ci)601 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
602 {
603 	int issued;
604 	spin_lock(&ci->i_ceph_lock);
605 	issued = __ceph_caps_issued(ci, NULL);
606 	spin_unlock(&ci->i_ceph_lock);
607 	return issued;
608 }
609 
ceph_caps_issued_mask(struct ceph_inode_info * ci,int mask,int touch)610 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
611 					int touch)
612 {
613 	int r;
614 	spin_lock(&ci->i_ceph_lock);
615 	r = __ceph_caps_issued_mask(ci, mask, touch);
616 	spin_unlock(&ci->i_ceph_lock);
617 	return r;
618 }
619 
__ceph_caps_dirty(struct ceph_inode_info * ci)620 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
621 {
622 	return ci->i_dirty_caps | ci->i_flushing_caps;
623 }
624 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
625 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
626 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
627 				  struct ceph_cap_flush **pcf);
628 
629 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
630 				      struct ceph_cap *ocap, int mask);
631 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
632 extern int __ceph_caps_used(struct ceph_inode_info *ci);
633 
634 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
635 
636 /*
637  * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
638  */
__ceph_caps_wanted(struct ceph_inode_info * ci)639 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
640 {
641 	int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
642 	if (w & CEPH_CAP_FILE_BUFFER)
643 		w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
644 	return w;
645 }
646 
647 /* what the mds thinks we want */
648 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
649 
650 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
651 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
652 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
653 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc,
654 			     struct ceph_cap_reservation *ctx, int need);
655 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
656 			       struct ceph_cap_reservation *ctx);
657 extern void ceph_reservation_status(struct ceph_fs_client *client,
658 				    int *total, int *avail, int *used,
659 				    int *reserved, int *min);
660 
661 
662 
663 /*
664  * we keep buffered readdir results attached to file->private_data
665  */
666 #define CEPH_F_SYNC     1
667 #define CEPH_F_ATEND    2
668 
669 struct ceph_file_info {
670 	short fmode;     /* initialized on open */
671 	short flags;     /* CEPH_F_* */
672 
673 	/* readdir: position within the dir */
674 	u32 frag;
675 	struct ceph_mds_request *last_readdir;
676 
677 	/* readdir: position within a frag */
678 	unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
679 	char *last_name;       /* last entry in previous chunk */
680 	long long dir_release_count;
681 	long long dir_ordered_count;
682 	int readdir_cache_idx;
683 
684 	/* used for -o dirstat read() on directory thing */
685 	char *dir_info;
686 	int dir_info_len;
687 };
688 
689 struct ceph_readdir_cache_control {
690 	struct page  *page;
691 	struct dentry **dentries;
692 	int index;
693 };
694 
695 /*
696  * A "snap realm" describes a subset of the file hierarchy sharing
697  * the same set of snapshots that apply to it.  The realms themselves
698  * are organized into a hierarchy, such that children inherit (some of)
699  * the snapshots of their parents.
700  *
701  * All inodes within the realm that have capabilities are linked into a
702  * per-realm list.
703  */
704 struct ceph_snap_realm {
705 	u64 ino;
706 	atomic_t nref;
707 	struct rb_node node;
708 
709 	u64 created, seq;
710 	u64 parent_ino;
711 	u64 parent_since;   /* snapid when our current parent became so */
712 
713 	u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
714 	u32 num_prior_parent_snaps;   /*  had prior to parent_since */
715 	u64 *snaps;                   /* snaps specific to this realm */
716 	u32 num_snaps;
717 
718 	struct ceph_snap_realm *parent;
719 	struct list_head children;       /* list of child realms */
720 	struct list_head child_item;
721 
722 	struct list_head empty_item;     /* if i have ref==0 */
723 
724 	struct list_head dirty_item;     /* if realm needs new context */
725 
726 	/* the current set of snaps for this realm */
727 	struct ceph_snap_context *cached_context;
728 
729 	struct list_head inodes_with_caps;
730 	spinlock_t inodes_with_caps_lock;
731 };
732 
default_congestion_kb(void)733 static inline int default_congestion_kb(void)
734 {
735 	int congestion_kb;
736 
737 	/*
738 	 * Copied from NFS
739 	 *
740 	 * congestion size, scale with available memory.
741 	 *
742 	 *  64MB:    8192k
743 	 * 128MB:   11585k
744 	 * 256MB:   16384k
745 	 * 512MB:   23170k
746 	 *   1GB:   32768k
747 	 *   2GB:   46340k
748 	 *   4GB:   65536k
749 	 *   8GB:   92681k
750 	 *  16GB:  131072k
751 	 *
752 	 * This allows larger machines to have larger/more transfers.
753 	 * Limit the default to 256M
754 	 */
755 	congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
756 	if (congestion_kb > 256*1024)
757 		congestion_kb = 256*1024;
758 
759 	return congestion_kb;
760 }
761 
762 
763 
764 /* snap.c */
765 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
766 					       u64 ino);
767 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
768 				struct ceph_snap_realm *realm);
769 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
770 				struct ceph_snap_realm *realm);
771 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
772 				  void *p, void *e, bool deletion,
773 				  struct ceph_snap_realm **realm_ret);
774 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
775 			     struct ceph_mds_session *session,
776 			     struct ceph_msg *msg);
777 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
778 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
779 				  struct ceph_cap_snap *capsnap);
780 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
781 
782 /*
783  * a cap_snap is "pending" if it is still awaiting an in-progress
784  * sync write (that may/may not still update size, mtime, etc.).
785  */
__ceph_have_pending_cap_snap(struct ceph_inode_info * ci)786 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
787 {
788 	return !list_empty(&ci->i_cap_snaps) &&
789 	       list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
790 			       ci_item)->writing;
791 }
792 
793 /* inode.c */
794 extern const struct inode_operations ceph_file_iops;
795 
796 extern struct inode *ceph_alloc_inode(struct super_block *sb);
797 extern void ceph_destroy_inode(struct inode *inode);
798 extern int ceph_drop_inode(struct inode *inode);
799 
800 extern struct inode *ceph_get_inode(struct super_block *sb,
801 				    struct ceph_vino vino);
802 extern struct inode *ceph_get_snapdir(struct inode *parent);
803 extern int ceph_fill_file_size(struct inode *inode, int issued,
804 			       u32 truncate_seq, u64 truncate_size, u64 size);
805 extern void ceph_fill_file_time(struct inode *inode, int issued,
806 				u64 time_warp_seq, struct timespec *ctime,
807 				struct timespec *mtime, struct timespec *atime);
808 extern int ceph_fill_trace(struct super_block *sb,
809 			   struct ceph_mds_request *req);
810 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
811 				    struct ceph_mds_session *session);
812 
813 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
814 
815 extern bool ceph_inode_set_size(struct inode *inode, loff_t size);
816 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
817 extern void ceph_queue_vmtruncate(struct inode *inode);
818 
819 extern void ceph_queue_invalidate(struct inode *inode);
820 extern void ceph_queue_writeback(struct inode *inode);
821 
822 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
823 			     int mask, bool force);
ceph_do_getattr(struct inode * inode,int mask,bool force)824 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
825 {
826 	return __ceph_do_getattr(inode, NULL, mask, force);
827 }
828 extern int ceph_permission(struct inode *inode, int mask);
829 extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
830 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
831 extern int ceph_getattr(const struct path *path, struct kstat *stat,
832 			u32 request_mask, unsigned int flags);
833 
834 /* xattr.c */
835 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
836 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
837 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
838 extern struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci);
839 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
840 extern void __init ceph_xattr_init(void);
841 extern void ceph_xattr_exit(void);
842 extern const struct xattr_handler *ceph_xattr_handlers[];
843 
844 #ifdef CONFIG_SECURITY
845 extern bool ceph_security_xattr_deadlock(struct inode *in);
846 extern bool ceph_security_xattr_wanted(struct inode *in);
847 #else
ceph_security_xattr_deadlock(struct inode * in)848 static inline bool ceph_security_xattr_deadlock(struct inode *in)
849 {
850 	return false;
851 }
ceph_security_xattr_wanted(struct inode * in)852 static inline bool ceph_security_xattr_wanted(struct inode *in)
853 {
854 	return false;
855 }
856 #endif
857 
858 /* acl.c */
859 struct ceph_acls_info {
860 	void *default_acl;
861 	void *acl;
862 	struct ceph_pagelist *pagelist;
863 };
864 
865 #ifdef CONFIG_CEPH_FS_POSIX_ACL
866 
867 struct posix_acl *ceph_get_acl(struct inode *, int);
868 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
869 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
870 		       struct ceph_acls_info *info);
871 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
872 void ceph_release_acls_info(struct ceph_acls_info *info);
873 
ceph_forget_all_cached_acls(struct inode * inode)874 static inline void ceph_forget_all_cached_acls(struct inode *inode)
875 {
876        forget_all_cached_acls(inode);
877 }
878 
879 #else
880 
881 #define ceph_get_acl NULL
882 #define ceph_set_acl NULL
883 
ceph_pre_init_acls(struct inode * dir,umode_t * mode,struct ceph_acls_info * info)884 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
885 				     struct ceph_acls_info *info)
886 {
887 	return 0;
888 }
ceph_init_inode_acls(struct inode * inode,struct ceph_acls_info * info)889 static inline void ceph_init_inode_acls(struct inode *inode,
890 					struct ceph_acls_info *info)
891 {
892 }
ceph_release_acls_info(struct ceph_acls_info * info)893 static inline void ceph_release_acls_info(struct ceph_acls_info *info)
894 {
895 }
ceph_acl_chmod(struct dentry * dentry,struct inode * inode)896 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
897 {
898 	return 0;
899 }
900 
ceph_forget_all_cached_acls(struct inode * inode)901 static inline void ceph_forget_all_cached_acls(struct inode *inode)
902 {
903 }
904 
905 #endif
906 
907 /* caps.c */
908 extern const char *ceph_cap_string(int c);
909 extern void ceph_handle_caps(struct ceph_mds_session *session,
910 			     struct ceph_msg *msg);
911 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
912 				     struct ceph_cap_reservation *ctx);
913 extern void ceph_add_cap(struct inode *inode,
914 			 struct ceph_mds_session *session, u64 cap_id,
915 			 int fmode, unsigned issued, unsigned wanted,
916 			 unsigned cap, unsigned seq, u64 realmino, int flags,
917 			 struct ceph_cap **new_cap);
918 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
919 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
920 			 struct ceph_cap *cap);
921 extern int ceph_is_any_caps(struct inode *inode);
922 
923 extern void ceph_queue_caps_release(struct inode *inode);
924 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
925 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
926 		      int datasync);
927 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
928 					  struct ceph_mds_session *session);
929 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
930 				    struct ceph_mds_session *session);
931 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
932 					     int mds);
933 extern int ceph_get_cap_mds(struct inode *inode);
934 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
935 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
936 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
937 				       struct ceph_snap_context *snapc);
938 extern void ceph_flush_snaps(struct ceph_inode_info *ci,
939 			     struct ceph_mds_session **psession);
940 extern bool __ceph_should_report_size(struct ceph_inode_info *ci);
941 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
942 			    struct ceph_mds_session *session);
943 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
944 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
945 
946 extern int ceph_encode_inode_release(void **p, struct inode *inode,
947 				     int mds, int drop, int unless, int force);
948 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
949 				      struct inode *dir,
950 				      int mds, int drop, int unless);
951 
952 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
953 			 loff_t endoff, int *got, struct page **pinned_page);
954 extern int ceph_try_get_caps(struct ceph_inode_info *ci,
955 			     int need, int want, int *got);
956 
957 /* for counting open files by mode */
958 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode);
959 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
960 
961 /* addr.c */
962 extern const struct address_space_operations ceph_aops;
963 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
964 extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
965 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
966 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
967 
968 /* file.c */
969 extern const struct file_operations ceph_file_fops;
970 
971 extern int ceph_renew_caps(struct inode *inode);
972 extern int ceph_open(struct inode *inode, struct file *file);
973 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
974 			    struct file *file, unsigned flags, umode_t mode,
975 			    int *opened);
976 extern int ceph_release(struct inode *inode, struct file *filp);
977 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
978 				  char *data, size_t len);
979 
980 /* dir.c */
981 extern const struct file_operations ceph_dir_fops;
982 extern const struct file_operations ceph_snapdir_fops;
983 extern const struct inode_operations ceph_dir_iops;
984 extern const struct inode_operations ceph_snapdir_iops;
985 extern const struct dentry_operations ceph_dentry_ops;
986 
987 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order);
988 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
989 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
990 			       struct dentry *dentry, int err);
991 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
992 					 struct dentry *dentry, int err);
993 
994 extern void ceph_dentry_lru_add(struct dentry *dn);
995 extern void ceph_dentry_lru_touch(struct dentry *dn);
996 extern void ceph_dentry_lru_del(struct dentry *dn);
997 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
998 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
999 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
1000 
1001 /* ioctl.c */
1002 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1003 
1004 /* export.c */
1005 extern const struct export_operations ceph_export_ops;
1006 
1007 /* locks.c */
1008 extern __init void ceph_flock_init(void);
1009 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
1010 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
1011 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
1012 extern int ceph_encode_locks_to_buffer(struct inode *inode,
1013 				       struct ceph_filelock *flocks,
1014 				       int num_fcntl_locks,
1015 				       int num_flock_locks);
1016 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
1017 				  struct ceph_pagelist *pagelist,
1018 				  int num_fcntl_locks, int num_flock_locks);
1019 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c);
1020 
1021 /* debugfs.c */
1022 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
1023 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
1024 
1025 #endif /* _FS_CEPH_SUPER_H */
1026