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TOMOYO Linux Cross Reference
Linux/fs/ceph/super.h

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  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 #define CEPH_MOUNT_OPT_NOQUOTADF       (1<<13) /* no root dir quota in statfs */
 43 #define CEPH_MOUNT_OPT_NOCOPYFROM      (1<<14) /* don't use RADOS 'copy-from' op */
 44 
 45 #define CEPH_MOUNT_OPT_DEFAULT                  \
 46         (CEPH_MOUNT_OPT_DCACHE |                \
 47          CEPH_MOUNT_OPT_NOCOPYFROM)
 48 
 49 #define ceph_set_mount_opt(fsc, opt) \
 50         (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt;
 51 #define ceph_test_mount_opt(fsc, opt) \
 52         (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
 53 
 54 /* max size of osd read request, limited by libceph */
 55 #define CEPH_MAX_READ_SIZE              CEPH_MSG_MAX_DATA_LEN
 56 /* osd has a configurable limitaion of max write size.
 57  * CEPH_MSG_MAX_DATA_LEN should be small enough. */
 58 #define CEPH_MAX_WRITE_SIZE             CEPH_MSG_MAX_DATA_LEN
 59 #define CEPH_RASIZE_DEFAULT             (8192*1024)    /* max readahead */
 60 #define CEPH_MAX_READDIR_DEFAULT        1024
 61 #define CEPH_MAX_READDIR_BYTES_DEFAULT  (512*1024)
 62 #define CEPH_SNAPDIRNAME_DEFAULT        ".snap"
 63 
 64 /*
 65  * Delay telling the MDS we no longer want caps, in case we reopen
 66  * the file.  Delay a minimum amount of time, even if we send a cap
 67  * message for some other reason.  Otherwise, take the oppotunity to
 68  * update the mds to avoid sending another message later.
 69  */
 70 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT      5  /* cap release delay */
 71 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT     60  /* cap release delay */
 72 
 73 struct ceph_mount_options {
 74         int flags;
 75         int sb_flags;
 76 
 77         int wsize;            /* max write size */
 78         int rsize;            /* max read size */
 79         int rasize;           /* max readahead */
 80         int congestion_kb;    /* max writeback in flight */
 81         int caps_wanted_delay_min, caps_wanted_delay_max;
 82         int max_readdir;       /* max readdir result (entires) */
 83         int max_readdir_bytes; /* max readdir result (bytes) */
 84 
 85         /*
 86          * everything above this point can be memcmp'd; everything below
 87          * is handled in compare_mount_options()
 88          */
 89 
 90         char *snapdir_name;   /* default ".snap" */
 91         char *mds_namespace;  /* default NULL */
 92         char *server_path;    /* default  "/" */
 93         char *fscache_uniq;   /* default NULL */
 94 };
 95 
 96 struct ceph_fs_client {
 97         struct super_block *sb;
 98 
 99         struct ceph_mount_options *mount_options;
100         struct ceph_client *client;
101 
102         unsigned long mount_state;
103         int min_caps;                  /* min caps i added */
104         loff_t max_file_size;
105 
106         struct ceph_mds_client *mdsc;
107 
108         /* writeback */
109         mempool_t *wb_pagevec_pool;
110         struct workqueue_struct *wb_wq;
111         struct workqueue_struct *pg_inv_wq;
112         struct workqueue_struct *trunc_wq;
113         atomic_long_t writeback_count;
114 
115 #ifdef CONFIG_DEBUG_FS
116         struct dentry *debugfs_dentry_lru, *debugfs_caps;
117         struct dentry *debugfs_congestion_kb;
118         struct dentry *debugfs_bdi;
119         struct dentry *debugfs_mdsc, *debugfs_mdsmap;
120         struct dentry *debugfs_mds_sessions;
121 #endif
122 
123 #ifdef CONFIG_CEPH_FSCACHE
124         struct fscache_cookie *fscache;
125 #endif
126 };
127 
128 
129 /*
130  * File i/o capability.  This tracks shared state with the metadata
131  * server that allows us to cache or writeback attributes or to read
132  * and write data.  For any given inode, we should have one or more
133  * capabilities, one issued by each metadata server, and our
134  * cumulative access is the OR of all issued capabilities.
135  *
136  * Each cap is referenced by the inode's i_caps rbtree and by per-mds
137  * session capability lists.
138  */
139 struct ceph_cap {
140         struct ceph_inode_info *ci;
141         struct rb_node ci_node;          /* per-ci cap tree */
142         struct ceph_mds_session *session;
143         struct list_head session_caps;   /* per-session caplist */
144         u64 cap_id;       /* unique cap id (mds provided) */
145         union {
146                 /* in-use caps */
147                 struct {
148                         int issued;       /* latest, from the mds */
149                         int implemented;  /* implemented superset of
150                                              issued (for revocation) */
151                         int mds, mds_wanted;
152                 };
153                 /* caps to release */
154                 struct {
155                         u64 cap_ino;
156                         int queue_release;
157                 };
158         };
159         u32 seq, issue_seq, mseq;
160         u32 cap_gen;      /* active/stale cycle */
161         unsigned long last_used;
162         struct list_head caps_item;
163 };
164 
165 #define CHECK_CAPS_NODELAY    1  /* do not delay any further */
166 #define CHECK_CAPS_AUTHONLY   2  /* only check auth cap */
167 #define CHECK_CAPS_FLUSH      4  /* flush any dirty caps */
168 
169 struct ceph_cap_flush {
170         u64 tid;
171         int caps; /* 0 means capsnap */
172         bool wake; /* wake up flush waiters when finish ? */
173         struct list_head g_list; // global
174         struct list_head i_list; // per inode
175 };
176 
177 /*
178  * Snapped cap state that is pending flush to mds.  When a snapshot occurs,
179  * we first complete any in-process sync writes and writeback any dirty
180  * data before flushing the snapped state (tracked here) back to the MDS.
181  */
182 struct ceph_cap_snap {
183         refcount_t nref;
184         struct list_head ci_item;
185 
186         struct ceph_cap_flush cap_flush;
187 
188         u64 follows;
189         int issued, dirty;
190         struct ceph_snap_context *context;
191 
192         umode_t mode;
193         kuid_t uid;
194         kgid_t gid;
195 
196         struct ceph_buffer *xattr_blob;
197         u64 xattr_version;
198 
199         u64 size;
200         struct timespec64 mtime, atime, ctime;
201         u64 time_warp_seq;
202         u64 truncate_size;
203         u32 truncate_seq;
204         int writing;   /* a sync write is still in progress */
205         int dirty_pages;     /* dirty pages awaiting writeback */
206         bool inline_data;
207         bool need_flush;
208 };
209 
210 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
211 {
212         if (refcount_dec_and_test(&capsnap->nref)) {
213                 if (capsnap->xattr_blob)
214                         ceph_buffer_put(capsnap->xattr_blob);
215                 kfree(capsnap);
216         }
217 }
218 
219 /*
220  * The frag tree describes how a directory is fragmented, potentially across
221  * multiple metadata servers.  It is also used to indicate points where
222  * metadata authority is delegated, and whether/where metadata is replicated.
223  *
224  * A _leaf_ frag will be present in the i_fragtree IFF there is
225  * delegation info.  That is, if mds >= 0 || ndist > 0.
226  */
227 #define CEPH_MAX_DIRFRAG_REP 4
228 
229 struct ceph_inode_frag {
230         struct rb_node node;
231 
232         /* fragtree state */
233         u32 frag;
234         int split_by;         /* i.e. 2^(split_by) children */
235 
236         /* delegation and replication info */
237         int mds;              /* -1 if same authority as parent */
238         int ndist;            /* >0 if replicated */
239         int dist[CEPH_MAX_DIRFRAG_REP];
240 };
241 
242 /*
243  * We cache inode xattrs as an encoded blob until they are first used,
244  * at which point we parse them into an rbtree.
245  */
246 struct ceph_inode_xattr {
247         struct rb_node node;
248 
249         const char *name;
250         int name_len;
251         const char *val;
252         int val_len;
253         int dirty;
254 
255         int should_free_name;
256         int should_free_val;
257 };
258 
259 /*
260  * Ceph dentry state
261  */
262 struct ceph_dentry_info {
263         struct ceph_mds_session *lease_session;
264         int lease_shared_gen;
265         u32 lease_gen;
266         u32 lease_seq;
267         unsigned long lease_renew_after, lease_renew_from;
268         struct list_head lru;
269         struct dentry *dentry;
270         unsigned long time;
271         u64 offset;
272 };
273 
274 struct ceph_inode_xattrs_info {
275         /*
276          * (still encoded) xattr blob. we avoid the overhead of parsing
277          * this until someone actually calls getxattr, etc.
278          *
279          * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
280          * NULL means we don't know.
281         */
282         struct ceph_buffer *blob, *prealloc_blob;
283 
284         struct rb_root index;
285         bool dirty;
286         int count;
287         int names_size;
288         int vals_size;
289         u64 version, index_version;
290 };
291 
292 /*
293  * Ceph inode.
294  */
295 struct ceph_inode_info {
296         struct ceph_vino i_vino;   /* ceph ino + snap */
297 
298         spinlock_t i_ceph_lock;
299 
300         u64 i_version;
301         u64 i_inline_version;
302         u32 i_time_warp_seq;
303 
304         unsigned i_ceph_flags;
305         atomic64_t i_release_count;
306         atomic64_t i_ordered_count;
307         atomic64_t i_complete_seq[2];
308 
309         struct ceph_dir_layout i_dir_layout;
310         struct ceph_file_layout i_layout;
311         char *i_symlink;
312 
313         /* for dirs */
314         struct timespec64 i_rctime;
315         u64 i_rbytes, i_rfiles, i_rsubdirs;
316         u64 i_files, i_subdirs;
317 
318         /* quotas */
319         u64 i_max_bytes, i_max_files;
320 
321         struct rb_root i_fragtree;
322         int i_fragtree_nsplits;
323         struct mutex i_fragtree_mutex;
324 
325         struct ceph_inode_xattrs_info i_xattrs;
326 
327         /* capabilities.  protected _both_ by i_ceph_lock and cap->session's
328          * s_mutex. */
329         struct rb_root i_caps;           /* cap list */
330         struct ceph_cap *i_auth_cap;     /* authoritative cap, if any */
331         unsigned i_dirty_caps, i_flushing_caps;     /* mask of dirtied fields */
332         struct list_head i_dirty_item, i_flushing_item;
333         /* we need to track cap writeback on a per-cap-bit basis, to allow
334          * overlapping, pipelined cap flushes to the mds.  we can probably
335          * reduce the tid to 8 bits if we're concerned about inode size. */
336         struct ceph_cap_flush *i_prealloc_cap_flush;
337         struct list_head i_cap_flush_list;
338         wait_queue_head_t i_cap_wq;      /* threads waiting on a capability */
339         unsigned long i_hold_caps_min; /* jiffies */
340         unsigned long i_hold_caps_max; /* jiffies */
341         struct list_head i_cap_delay_list;  /* for delayed cap release to mds */
342         struct ceph_cap_reservation i_cap_migration_resv;
343         struct list_head i_cap_snaps;   /* snapped state pending flush to mds */
344         struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or
345                                                     dirty|flushing caps */
346         unsigned i_snap_caps;           /* cap bits for snapped files */
347 
348         int i_nr_by_mode[CEPH_FILE_MODE_BITS];  /* open file counts */
349 
350         struct mutex i_truncate_mutex;
351         u32 i_truncate_seq;        /* last truncate to smaller size */
352         u64 i_truncate_size;       /*  and the size we last truncated down to */
353         int i_truncate_pending;    /*  still need to call vmtruncate */
354 
355         u64 i_max_size;            /* max file size authorized by mds */
356         u64 i_reported_size; /* (max_)size reported to or requested of mds */
357         u64 i_wanted_max_size;     /* offset we'd like to write too */
358         u64 i_requested_max_size;  /* max_size we've requested */
359 
360         /* held references to caps */
361         int i_pin_ref;
362         int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref;
363         int i_wrbuffer_ref, i_wrbuffer_ref_head;
364         atomic_t i_filelock_ref;
365         atomic_t i_shared_gen;       /* increment each time we get FILE_SHARED */
366         u32 i_rdcache_gen;      /* incremented each time we get FILE_CACHE. */
367         u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
368 
369         struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
370         struct list_head i_unsafe_iops;   /* uncommitted mds inode ops */
371         spinlock_t i_unsafe_lock;
372 
373         struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
374         int i_snap_realm_counter; /* snap realm (if caps) */
375         struct list_head i_snap_realm_item;
376         struct list_head i_snap_flush_item;
377 
378         struct work_struct i_wb_work;  /* writeback work */
379         struct work_struct i_pg_inv_work;  /* page invalidation work */
380 
381         struct work_struct i_vmtruncate_work;
382 
383 #ifdef CONFIG_CEPH_FSCACHE
384         struct fscache_cookie *fscache;
385         u32 i_fscache_gen;
386 #endif
387         struct inode vfs_inode; /* at end */
388 };
389 
390 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
391 {
392         return container_of(inode, struct ceph_inode_info, vfs_inode);
393 }
394 
395 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode)
396 {
397         return (struct ceph_fs_client *)inode->i_sb->s_fs_info;
398 }
399 
400 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb)
401 {
402         return (struct ceph_fs_client *)sb->s_fs_info;
403 }
404 
405 static inline struct ceph_vino ceph_vino(struct inode *inode)
406 {
407         return ceph_inode(inode)->i_vino;
408 }
409 
410 /*
411  * ino_t is <64 bits on many architectures, blech.
412  *
413  *               i_ino (kernel inode)   st_ino (userspace)
414  * i386          32                     32
415  * x86_64+ino32  64                     32
416  * x86_64        64                     64
417  */
418 static inline u32 ceph_ino_to_ino32(__u64 vino)
419 {
420         u32 ino = vino & 0xffffffff;
421         ino ^= vino >> 32;
422         if (!ino)
423                 ino = 2;
424         return ino;
425 }
426 
427 /*
428  * kernel i_ino value
429  */
430 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
431 {
432 #if BITS_PER_LONG == 32
433         return ceph_ino_to_ino32(vino.ino);
434 #else
435         return (ino_t)vino.ino;
436 #endif
437 }
438 
439 /*
440  * user-visible ino (stat, filldir)
441  */
442 #if BITS_PER_LONG == 32
443 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
444 {
445         return ino;
446 }
447 #else
448 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino)
449 {
450         if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))
451                 ino = ceph_ino_to_ino32(ino);
452         return ino;
453 }
454 #endif
455 
456 
457 /* for printf-style formatting */
458 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
459 
460 static inline u64 ceph_ino(struct inode *inode)
461 {
462         return ceph_inode(inode)->i_vino.ino;
463 }
464 static inline u64 ceph_snap(struct inode *inode)
465 {
466         return ceph_inode(inode)->i_vino.snap;
467 }
468 
469 static inline int ceph_ino_compare(struct inode *inode, void *data)
470 {
471         struct ceph_vino *pvino = (struct ceph_vino *)data;
472         struct ceph_inode_info *ci = ceph_inode(inode);
473         return ci->i_vino.ino == pvino->ino &&
474                 ci->i_vino.snap == pvino->snap;
475 }
476 
477 static inline struct inode *ceph_find_inode(struct super_block *sb,
478                                             struct ceph_vino vino)
479 {
480         ino_t t = ceph_vino_to_ino(vino);
481         return ilookup5(sb, t, ceph_ino_compare, &vino);
482 }
483 
484 
485 /*
486  * Ceph inode.
487  */
488 #define CEPH_I_DIR_ORDERED      (1 << 0)  /* dentries in dir are ordered */
489 #define CEPH_I_NODELAY          (1 << 1)  /* do not delay cap release */
490 #define CEPH_I_FLUSH            (1 << 2)  /* do not delay flush of dirty metadata */
491 #define CEPH_I_NOFLUSH          (1 << 3)  /* do not flush dirty caps */
492 #define CEPH_I_POOL_PERM        (1 << 4)  /* pool rd/wr bits are valid */
493 #define CEPH_I_POOL_RD          (1 << 5)  /* can read from pool */
494 #define CEPH_I_POOL_WR          (1 << 6)  /* can write to pool */
495 #define CEPH_I_SEC_INITED       (1 << 7)  /* security initialized */
496 #define CEPH_I_CAP_DROPPED      (1 << 8)  /* caps were forcibly dropped */
497 #define CEPH_I_KICK_FLUSH       (1 << 9)  /* kick flushing caps */
498 #define CEPH_I_FLUSH_SNAPS      (1 << 10) /* need flush snapss */
499 #define CEPH_I_ERROR_WRITE      (1 << 11) /* have seen write errors */
500 #define CEPH_I_ERROR_FILELOCK   (1 << 12) /* have seen file lock errors */
501 
502 
503 /*
504  * We set the ERROR_WRITE bit when we start seeing write errors on an inode
505  * and then clear it when they start succeeding. Note that we do a lockless
506  * check first, and only take the lock if it looks like it needs to be changed.
507  * The write submission code just takes this as a hint, so we're not too
508  * worried if a few slip through in either direction.
509  */
510 static inline void ceph_set_error_write(struct ceph_inode_info *ci)
511 {
512         if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) {
513                 spin_lock(&ci->i_ceph_lock);
514                 ci->i_ceph_flags |= CEPH_I_ERROR_WRITE;
515                 spin_unlock(&ci->i_ceph_lock);
516         }
517 }
518 
519 static inline void ceph_clear_error_write(struct ceph_inode_info *ci)
520 {
521         if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) {
522                 spin_lock(&ci->i_ceph_lock);
523                 ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE;
524                 spin_unlock(&ci->i_ceph_lock);
525         }
526 }
527 
528 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci,
529                                            long long release_count,
530                                            long long ordered_count)
531 {
532         smp_mb__before_atomic();
533         atomic64_set(&ci->i_complete_seq[0], release_count);
534         atomic64_set(&ci->i_complete_seq[1], ordered_count);
535 }
536 
537 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci)
538 {
539         atomic64_inc(&ci->i_release_count);
540 }
541 
542 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci)
543 {
544         atomic64_inc(&ci->i_ordered_count);
545 }
546 
547 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci)
548 {
549         return atomic64_read(&ci->i_complete_seq[0]) ==
550                 atomic64_read(&ci->i_release_count);
551 }
552 
553 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci)
554 {
555         return  atomic64_read(&ci->i_complete_seq[0]) ==
556                 atomic64_read(&ci->i_release_count) &&
557                 atomic64_read(&ci->i_complete_seq[1]) ==
558                 atomic64_read(&ci->i_ordered_count);
559 }
560 
561 static inline void ceph_dir_clear_complete(struct inode *inode)
562 {
563         __ceph_dir_clear_complete(ceph_inode(inode));
564 }
565 
566 static inline void ceph_dir_clear_ordered(struct inode *inode)
567 {
568         __ceph_dir_clear_ordered(ceph_inode(inode));
569 }
570 
571 static inline bool ceph_dir_is_complete_ordered(struct inode *inode)
572 {
573         bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode));
574         smp_rmb();
575         return ret;
576 }
577 
578 /* find a specific frag @f */
579 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
580                                                 u32 f);
581 
582 /*
583  * choose fragment for value @v.  copy frag content to pfrag, if leaf
584  * exists
585  */
586 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
587                             struct ceph_inode_frag *pfrag,
588                             int *found);
589 
590 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
591 {
592         return (struct ceph_dentry_info *)dentry->d_fsdata;
593 }
594 
595 /*
596  * caps helpers
597  */
598 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
599 {
600         return !RB_EMPTY_ROOT(&ci->i_caps);
601 }
602 
603 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
604 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
605 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
606                                     struct ceph_cap *cap);
607 
608 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
609 {
610         int issued;
611         spin_lock(&ci->i_ceph_lock);
612         issued = __ceph_caps_issued(ci, NULL);
613         spin_unlock(&ci->i_ceph_lock);
614         return issued;
615 }
616 
617 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
618                                         int touch)
619 {
620         int r;
621         spin_lock(&ci->i_ceph_lock);
622         r = __ceph_caps_issued_mask(ci, mask, touch);
623         spin_unlock(&ci->i_ceph_lock);
624         return r;
625 }
626 
627 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
628 {
629         return ci->i_dirty_caps | ci->i_flushing_caps;
630 }
631 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void);
632 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf);
633 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask,
634                                   struct ceph_cap_flush **pcf);
635 
636 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci,
637                                       struct ceph_cap *ocap, int mask);
638 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
639 extern int __ceph_caps_used(struct ceph_inode_info *ci);
640 
641 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
642 
643 /*
644  * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
645  */
646 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
647 {
648         int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
649         if (w & CEPH_CAP_FILE_BUFFER)
650                 w |= CEPH_CAP_FILE_EXCL;  /* we want EXCL if dirty data */
651         return w;
652 }
653 
654 /* what the mds thinks we want */
655 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
656 
657 extern void ceph_caps_init(struct ceph_mds_client *mdsc);
658 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);
659 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta);
660 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc,
661                              struct ceph_cap_reservation *ctx, int need);
662 extern void ceph_unreserve_caps(struct ceph_mds_client *mdsc,
663                                struct ceph_cap_reservation *ctx);
664 extern void ceph_reservation_status(struct ceph_fs_client *client,
665                                     int *total, int *avail, int *used,
666                                     int *reserved, int *min);
667 
668 
669 
670 /*
671  * we keep buffered readdir results attached to file->private_data
672  */
673 #define CEPH_F_SYNC     1
674 #define CEPH_F_ATEND    2
675 
676 struct ceph_file_info {
677         short fmode;     /* initialized on open */
678         short flags;     /* CEPH_F_* */
679 
680         spinlock_t rw_contexts_lock;
681         struct list_head rw_contexts;
682 };
683 
684 struct ceph_dir_file_info {
685         struct ceph_file_info file_info;
686 
687         /* readdir: position within the dir */
688         u32 frag;
689         struct ceph_mds_request *last_readdir;
690 
691         /* readdir: position within a frag */
692         unsigned next_offset;  /* offset of next chunk (last_name's + 1) */
693         char *last_name;       /* last entry in previous chunk */
694         long long dir_release_count;
695         long long dir_ordered_count;
696         int readdir_cache_idx;
697 
698         /* used for -o dirstat read() on directory thing */
699         char *dir_info;
700         int dir_info_len;
701 };
702 
703 struct ceph_rw_context {
704         struct list_head list;
705         struct task_struct *thread;
706         int caps;
707 };
708 
709 #define CEPH_DEFINE_RW_CONTEXT(_name, _caps)    \
710         struct ceph_rw_context _name = {        \
711                 .thread = current,              \
712                 .caps = _caps,                  \
713         }
714 
715 static inline void ceph_add_rw_context(struct ceph_file_info *cf,
716                                        struct ceph_rw_context *ctx)
717 {
718         spin_lock(&cf->rw_contexts_lock);
719         list_add(&ctx->list, &cf->rw_contexts);
720         spin_unlock(&cf->rw_contexts_lock);
721 }
722 
723 static inline void ceph_del_rw_context(struct ceph_file_info *cf,
724                                        struct ceph_rw_context *ctx)
725 {
726         spin_lock(&cf->rw_contexts_lock);
727         list_del(&ctx->list);
728         spin_unlock(&cf->rw_contexts_lock);
729 }
730 
731 static inline struct ceph_rw_context*
732 ceph_find_rw_context(struct ceph_file_info *cf)
733 {
734         struct ceph_rw_context *ctx, *found = NULL;
735         spin_lock(&cf->rw_contexts_lock);
736         list_for_each_entry(ctx, &cf->rw_contexts, list) {
737                 if (ctx->thread == current) {
738                         found = ctx;
739                         break;
740                 }
741         }
742         spin_unlock(&cf->rw_contexts_lock);
743         return found;
744 }
745 
746 struct ceph_readdir_cache_control {
747         struct page  *page;
748         struct dentry **dentries;
749         int index;
750 };
751 
752 /*
753  * A "snap realm" describes a subset of the file hierarchy sharing
754  * the same set of snapshots that apply to it.  The realms themselves
755  * are organized into a hierarchy, such that children inherit (some of)
756  * the snapshots of their parents.
757  *
758  * All inodes within the realm that have capabilities are linked into a
759  * per-realm list.
760  */
761 struct ceph_snap_realm {
762         u64 ino;
763         struct inode *inode;
764         atomic_t nref;
765         struct rb_node node;
766 
767         u64 created, seq;
768         u64 parent_ino;
769         u64 parent_since;   /* snapid when our current parent became so */
770 
771         u64 *prior_parent_snaps;      /* snaps inherited from any parents we */
772         u32 num_prior_parent_snaps;   /*  had prior to parent_since */
773         u64 *snaps;                   /* snaps specific to this realm */
774         u32 num_snaps;
775 
776         struct ceph_snap_realm *parent;
777         struct list_head children;       /* list of child realms */
778         struct list_head child_item;
779 
780         struct list_head empty_item;     /* if i have ref==0 */
781 
782         struct list_head dirty_item;     /* if realm needs new context */
783 
784         /* the current set of snaps for this realm */
785         struct ceph_snap_context *cached_context;
786 
787         struct list_head inodes_with_caps;
788         spinlock_t inodes_with_caps_lock;
789 };
790 
791 static inline int default_congestion_kb(void)
792 {
793         int congestion_kb;
794 
795         /*
796          * Copied from NFS
797          *
798          * congestion size, scale with available memory.
799          *
800          *  64MB:    8192k
801          * 128MB:   11585k
802          * 256MB:   16384k
803          * 512MB:   23170k
804          *   1GB:   32768k
805          *   2GB:   46340k
806          *   4GB:   65536k
807          *   8GB:   92681k
808          *  16GB:  131072k
809          *
810          * This allows larger machines to have larger/more transfers.
811          * Limit the default to 256M
812          */
813         congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
814         if (congestion_kb > 256*1024)
815                 congestion_kb = 256*1024;
816 
817         return congestion_kb;
818 }
819 
820 
821 
822 /* snap.c */
823 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
824                                                u64 ino);
825 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
826                                 struct ceph_snap_realm *realm);
827 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
828                                 struct ceph_snap_realm *realm);
829 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
830                                   void *p, void *e, bool deletion,
831                                   struct ceph_snap_realm **realm_ret);
832 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
833                              struct ceph_mds_session *session,
834                              struct ceph_msg *msg);
835 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci);
836 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
837                                   struct ceph_cap_snap *capsnap);
838 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
839 
840 /*
841  * a cap_snap is "pending" if it is still awaiting an in-progress
842  * sync write (that may/may not still update size, mtime, etc.).
843  */
844 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
845 {
846         return !list_empty(&ci->i_cap_snaps) &&
847                list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap,
848                                ci_item)->writing;
849 }
850 
851 /* inode.c */
852 extern const struct inode_operations ceph_file_iops;
853 
854 extern struct inode *ceph_alloc_inode(struct super_block *sb);
855 extern void ceph_destroy_inode(struct inode *inode);
856 extern int ceph_drop_inode(struct inode *inode);
857 
858 extern struct inode *ceph_get_inode(struct super_block *sb,
859                                     struct ceph_vino vino);
860 extern struct inode *ceph_get_snapdir(struct inode *parent);
861 extern int ceph_fill_file_size(struct inode *inode, int issued,
862                                u32 truncate_seq, u64 truncate_size, u64 size);
863 extern void ceph_fill_file_time(struct inode *inode, int issued,
864                                 u64 time_warp_seq, struct timespec64 *ctime,
865                                 struct timespec64 *mtime,
866                                 struct timespec64 *atime);
867 extern int ceph_fill_trace(struct super_block *sb,
868                            struct ceph_mds_request *req);
869 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
870                                     struct ceph_mds_session *session);
871 
872 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
873 
874 extern bool ceph_inode_set_size(struct inode *inode, loff_t size);
875 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
876 extern void ceph_queue_vmtruncate(struct inode *inode);
877 
878 extern void ceph_queue_invalidate(struct inode *inode);
879 extern void ceph_queue_writeback(struct inode *inode);
880 
881 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
882                              int mask, bool force);
883 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
884 {
885         return __ceph_do_getattr(inode, NULL, mask, force);
886 }
887 extern int ceph_permission(struct inode *inode, int mask);
888 extern int __ceph_setattr(struct inode *inode, struct iattr *attr);
889 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
890 extern int ceph_getattr(const struct path *path, struct kstat *stat,
891                         u32 request_mask, unsigned int flags);
892 
893 /* xattr.c */
894 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int);
895 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
896 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
897 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
898 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
899 extern void __init ceph_xattr_init(void);
900 extern void ceph_xattr_exit(void);
901 extern const struct xattr_handler *ceph_xattr_handlers[];
902 
903 #ifdef CONFIG_SECURITY
904 extern bool ceph_security_xattr_deadlock(struct inode *in);
905 extern bool ceph_security_xattr_wanted(struct inode *in);
906 #else
907 static inline bool ceph_security_xattr_deadlock(struct inode *in)
908 {
909         return false;
910 }
911 static inline bool ceph_security_xattr_wanted(struct inode *in)
912 {
913         return false;
914 }
915 #endif
916 
917 /* acl.c */
918 struct ceph_acls_info {
919         void *default_acl;
920         void *acl;
921         struct ceph_pagelist *pagelist;
922 };
923 
924 #ifdef CONFIG_CEPH_FS_POSIX_ACL
925 
926 struct posix_acl *ceph_get_acl(struct inode *, int);
927 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type);
928 int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
929                        struct ceph_acls_info *info);
930 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info);
931 void ceph_release_acls_info(struct ceph_acls_info *info);
932 
933 static inline void ceph_forget_all_cached_acls(struct inode *inode)
934 {
935        forget_all_cached_acls(inode);
936 }
937 
938 #else
939 
940 #define ceph_get_acl NULL
941 #define ceph_set_acl NULL
942 
943 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
944                                      struct ceph_acls_info *info)
945 {
946         return 0;
947 }
948 static inline void ceph_init_inode_acls(struct inode *inode,
949                                         struct ceph_acls_info *info)
950 {
951 }
952 static inline void ceph_release_acls_info(struct ceph_acls_info *info)
953 {
954 }
955 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
956 {
957         return 0;
958 }
959 
960 static inline void ceph_forget_all_cached_acls(struct inode *inode)
961 {
962 }
963 
964 #endif
965 
966 /* caps.c */
967 extern const char *ceph_cap_string(int c);
968 extern void ceph_handle_caps(struct ceph_mds_session *session,
969                              struct ceph_msg *msg);
970 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,
971                                      struct ceph_cap_reservation *ctx);
972 extern void ceph_add_cap(struct inode *inode,
973                          struct ceph_mds_session *session, u64 cap_id,
974                          int fmode, unsigned issued, unsigned wanted,
975                          unsigned cap, unsigned seq, u64 realmino, int flags,
976                          struct ceph_cap **new_cap);
977 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
978 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
979                          struct ceph_cap *cap);
980 extern int ceph_is_any_caps(struct inode *inode);
981 
982 extern void ceph_queue_caps_release(struct inode *inode);
983 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc);
984 extern int ceph_fsync(struct file *file, loff_t start, loff_t end,
985                       int datasync);
986 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
987                                           struct ceph_mds_session *session);
988 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
989                                     struct ceph_mds_session *session);
990 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci,
991                                              int mds);
992 extern int ceph_get_cap_mds(struct inode *inode);
993 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
994 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
995 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
996                                        struct ceph_snap_context *snapc);
997 extern void ceph_flush_snaps(struct ceph_inode_info *ci,
998                              struct ceph_mds_session **psession);
999 extern bool __ceph_should_report_size(struct ceph_inode_info *ci);
1000 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
1001                             struct ceph_mds_session *session);
1002 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
1003 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
1004 extern int  ceph_drop_caps_for_unlink(struct inode *inode);
1005 extern int ceph_encode_inode_release(void **p, struct inode *inode,
1006                                      int mds, int drop, int unless, int force);
1007 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
1008                                       struct inode *dir,
1009                                       int mds, int drop, int unless);
1010 
1011 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
1012                          loff_t endoff, int *got, struct page **pinned_page);
1013 extern int ceph_try_get_caps(struct ceph_inode_info *ci,
1014                              int need, int want, bool nonblock, int *got);
1015 
1016 /* for counting open files by mode */
1017 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode);
1018 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
1019 
1020 /* addr.c */
1021 extern const struct address_space_operations ceph_aops;
1022 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
1023 extern int ceph_uninline_data(struct file *filp, struct page *locked_page);
1024 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need);
1025 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc);
1026 
1027 /* file.c */
1028 extern const struct file_operations ceph_file_fops;
1029 
1030 extern int ceph_renew_caps(struct inode *inode);
1031 extern int ceph_open(struct inode *inode, struct file *file);
1032 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
1033                             struct file *file, unsigned flags, umode_t mode);
1034 extern int ceph_release(struct inode *inode, struct file *filp);
1035 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1036                                   char *data, size_t len);
1037 
1038 /* dir.c */
1039 extern const struct file_operations ceph_dir_fops;
1040 extern const struct file_operations ceph_snapdir_fops;
1041 extern const struct inode_operations ceph_dir_iops;
1042 extern const struct inode_operations ceph_snapdir_iops;
1043 extern const struct dentry_operations ceph_dentry_ops;
1044 
1045 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order);
1046 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
1047 extern int ceph_handle_snapdir(struct ceph_mds_request *req,
1048                                struct dentry *dentry, int err);
1049 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
1050                                          struct dentry *dentry, int err);
1051 
1052 extern void ceph_dentry_lru_add(struct dentry *dn);
1053 extern void ceph_dentry_lru_touch(struct dentry *dn);
1054 extern void ceph_dentry_lru_del(struct dentry *dn);
1055 extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
1056 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn);
1057 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl);
1058 
1059 /* ioctl.c */
1060 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1061 
1062 /* export.c */
1063 extern const struct export_operations ceph_export_ops;
1064 
1065 /* locks.c */
1066 extern __init void ceph_flock_init(void);
1067 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl);
1068 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl);
1069 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num);
1070 extern int ceph_encode_locks_to_buffer(struct inode *inode,
1071                                        struct ceph_filelock *flocks,
1072                                        int num_fcntl_locks,
1073                                        int num_flock_locks);
1074 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks,
1075                                   struct ceph_pagelist *pagelist,
1076                                   int num_fcntl_locks, int num_flock_locks);
1077 
1078 /* debugfs.c */
1079 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client);
1080 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
1081 
1082 /* quota.c */
1083 static inline bool __ceph_has_any_quota(struct ceph_inode_info *ci)
1084 {
1085         return ci->i_max_files || ci->i_max_bytes;
1086 }
1087 
1088 extern void ceph_adjust_quota_realms_count(struct inode *inode, bool inc);
1089 
1090 static inline void __ceph_update_quota(struct ceph_inode_info *ci,
1091                                        u64 max_bytes, u64 max_files)
1092 {
1093         bool had_quota, has_quota;
1094         had_quota = __ceph_has_any_quota(ci);
1095         ci->i_max_bytes = max_bytes;
1096         ci->i_max_files = max_files;
1097         has_quota = __ceph_has_any_quota(ci);
1098 
1099         if (had_quota != has_quota)
1100                 ceph_adjust_quota_realms_count(&ci->vfs_inode, has_quota);
1101 }
1102 
1103 extern void ceph_handle_quota(struct ceph_mds_client *mdsc,
1104                               struct ceph_mds_session *session,
1105                               struct ceph_msg *msg);
1106 extern bool ceph_quota_is_max_files_exceeded(struct inode *inode);
1107 extern bool ceph_quota_is_same_realm(struct inode *old, struct inode *new);
1108 extern bool ceph_quota_is_max_bytes_exceeded(struct inode *inode,
1109                                              loff_t newlen);
1110 extern bool ceph_quota_is_max_bytes_approaching(struct inode *inode,
1111                                                 loff_t newlen);
1112 extern bool ceph_quota_update_statfs(struct ceph_fs_client *fsc,
1113                                      struct kstatfs *buf);
1114 
1115 #endif /* _FS_CEPH_SUPER_H */
1116 

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