1 #ifndef _FS_CEPH_SUPER_H
2 #define _FS_CEPH_SUPER_H
4 #include "ceph_debug.h"
6 #include <asm/unaligned.h>
7 #include <linux/backing-dev.h>
8 #include <linux/completion.h>
9 #include <linux/exportfs.h>
11 #include <linux/mempool.h>
12 #include <linux/pagemap.h>
13 #include <linux/wait.h>
16 #include "messenger.h"
18 #include "mon_client.h"
19 #include "mds_client.h"
20 #include "osd_client.h"
23 /* f_type in struct statfs */
24 #define CEPH_SUPER_MAGIC 0x00c36400
26 /* large granularity for statfs utilization stats to facilitate
27 * large volume sizes on 32-bit machines. */
28 #define CEPH_BLOCK_SHIFT 20 /* 1 MB */
29 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT)
34 #define CEPH_OPT_FSID (1<<0)
35 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
36 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */
37 #define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */
38 #define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */
39 #define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */
40 #define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */
42 #define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES)
44 #define ceph_set_opt(client, opt) \
45 (client)->mount_args->flags |= CEPH_OPT_##opt;
46 #define ceph_test_opt(client, opt) \
47 (!!((client)->mount_args->flags & CEPH_OPT_##opt))
50 struct ceph_mount_args {
53 struct ceph_entity_addr *mon_addr;
56 int caps_wanted_delay_min, caps_wanted_delay_max;
57 struct ceph_fsid fsid;
58 struct ceph_entity_addr my_addr;
60 int rsize; /* max readahead */
61 int max_readdir; /* max readdir size */
63 char *snapdir_name; /* default ".snap" */
65 int cap_release_safety;
71 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60
72 #define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */
74 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
75 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
77 #define CEPH_SNAPDIRNAME_DEFAULT ".snap"
80 * Delay telling the MDS we no longer want caps, in case we reopen
81 * the file. Delay a minimum amount of time, even if we send a cap
82 * message for some other reason. Otherwise, take the oppotunity to
83 * update the mds to avoid sending another message later.
85 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
86 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
93 CEPH_MOUNT_UNMOUNTING,
101 static inline unsigned long time_sub(unsigned long a, unsigned long b)
103 BUG_ON(time_after(b, a));
104 return (long)a - (long)b;
108 * per-filesystem client state
110 * possibly shared by multiple mount points, if they are
111 * mounting the same ceph filesystem/cluster.
114 __s64 whoami; /* my client number */
115 struct dentry *debugfs_monmap;
116 struct dentry *debugfs_mdsmap, *debugfs_osdmap;
117 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
119 struct mutex mount_mutex; /* serialize mount attempts */
120 struct ceph_mount_args *mount_args;
121 struct ceph_fsid fsid;
123 struct super_block *sb;
125 unsigned long mount_state;
126 wait_queue_head_t mount_wq;
129 void *signed_ticket; /* our keys to the kingdom */
130 int signed_ticket_len;
132 struct ceph_messenger *msgr; /* messenger instance */
133 struct ceph_mon_client monc;
134 struct ceph_mds_client mdsc;
135 struct ceph_osd_client osdc;
138 mempool_t *wb_pagevec_pool;
139 struct workqueue_struct *wb_wq;
140 struct workqueue_struct *pg_inv_wq;
141 struct workqueue_struct *trunc_wq;
143 struct backing_dev_info backing_dev_info;
146 static inline struct ceph_client *ceph_client(struct super_block *sb)
148 return sb->s_fs_info;
153 * File i/o capability. This tracks shared state with the metadata
154 * server that allows us to cache or writeback attributes or to read
155 * and write data. For any given inode, we should have one or more
156 * capabilities, one issued by each metadata server, and our
157 * cumulative access is the OR of all issued capabilities.
159 * Each cap is referenced by the inode's i_caps rbtree and by per-mds
160 * session capability lists.
163 struct ceph_inode_info *ci;
164 struct rb_node ci_node; /* per-ci cap tree */
165 struct ceph_mds_session *session;
166 struct list_head session_caps; /* per-session caplist */
168 u64 cap_id; /* unique cap id (mds provided) */
169 int issued; /* latest, from the mds */
170 int implemented; /* implemented superset of issued (for revocation) */
172 u32 seq, issue_seq, mseq, gen;
173 unsigned long last_used;
174 struct list_head caps_item;
177 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */
178 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */
179 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */
182 * Snapped cap state that is pending flush to mds. When a snapshot occurs,
183 * we first complete any in-process sync writes and writeback any dirty
184 * data before flushing the snapped state (tracked here) back to the MDS.
186 struct ceph_cap_snap {
188 struct ceph_inode_info *ci;
189 struct list_head ci_item, flushing_item;
191 u64 follows, flush_tid;
193 struct ceph_snap_context *context;
204 struct timespec mtime, atime, ctime;
206 int writing; /* a sync write is still in progress */
207 int dirty_pages; /* dirty pages awaiting writeback */
210 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap)
212 if (atomic_dec_and_test(&capsnap->nref))
217 * The frag tree describes how a directory is fragmented, potentially across
218 * multiple metadata servers. It is also used to indicate points where
219 * metadata authority is delegated, and whether/where metadata is replicated.
221 * A _leaf_ frag will be present in the i_fragtree IFF there is
222 * delegation info. That is, if mds >= 0 || ndist > 0.
224 #define CEPH_MAX_DIRFRAG_REP 4
226 struct ceph_inode_frag {
231 int split_by; /* i.e. 2^(split_by) children */
233 /* delegation and replication info */
234 int mds; /* -1 if same authority as parent */
235 int ndist; /* >0 if replicated */
236 int dist[CEPH_MAX_DIRFRAG_REP];
240 * We cache inode xattrs as an encoded blob until they are first used,
241 * at which point we parse them into an rbtree.
243 struct ceph_inode_xattr {
252 int should_free_name;
256 struct ceph_inode_xattrs_info {
258 * (still encoded) xattr blob. we avoid the overhead of parsing
259 * this until someone actually calls getxattr, etc.
261 * blob->vec.iov_len == 4 implies there are no xattrs; blob ==
262 * NULL means we don't know.
264 struct ceph_buffer *blob, *prealloc_blob;
266 struct rb_root index;
271 u64 version, index_version;
277 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */
278 #define CEPH_I_NODELAY 4 /* do not delay cap release */
279 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */
281 struct ceph_inode_info {
282 struct ceph_vino i_vino; /* ceph ino + snap */
287 unsigned i_ceph_flags;
288 unsigned long i_release_count;
290 struct ceph_file_layout i_layout;
294 struct timespec i_rctime;
295 u64 i_rbytes, i_rfiles, i_rsubdirs;
296 u64 i_files, i_subdirs;
297 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */
299 struct rb_root i_fragtree;
300 struct mutex i_fragtree_mutex;
302 struct ceph_inode_xattrs_info i_xattrs;
304 /* capabilities. protected _both_ by i_lock and cap->session's
306 struct rb_root i_caps; /* cap list */
307 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */
308 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */
309 struct list_head i_dirty_item, i_flushing_item;
311 /* we need to track cap writeback on a per-cap-bit basis, to allow
312 * overlapping, pipelined cap flushes to the mds. we can probably
313 * reduce the tid to 8 bits if we're concerned about inode size. */
314 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS];
315 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */
316 unsigned long i_hold_caps_min; /* jiffies */
317 unsigned long i_hold_caps_max; /* jiffies */
318 struct list_head i_cap_delay_list; /* for delayed cap release to mds */
319 int i_cap_exporting_mds; /* to handle cap migration between */
320 unsigned i_cap_exporting_mseq; /* mds's. */
321 unsigned i_cap_exporting_issued;
322 struct ceph_cap_reservation i_cap_migration_resv;
323 struct list_head i_cap_snaps; /* snapped state pending flush to mds */
324 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */
325 unsigned i_snap_caps; /* cap bits for snapped files */
327 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
329 u32 i_truncate_seq; /* last truncate to smaller size */
330 u64 i_truncate_size; /* and the size we last truncated down to */
331 int i_truncate_pending; /* still need to call vmtruncate */
333 u64 i_max_size; /* max file size authorized by mds */
334 u64 i_reported_size; /* (max_)size reported to or requested of mds */
335 u64 i_wanted_max_size; /* offset we'd like to write too */
336 u64 i_requested_max_size; /* max_size we've requested */
338 /* held references to caps */
340 int i_rd_ref, i_rdcache_ref, i_wr_ref;
341 int i_wrbuffer_ref, i_wrbuffer_ref_head;
342 u32 i_shared_gen; /* increment each time we get FILE_SHARED */
343 u32 i_rdcache_gen; /* we increment this each time we get
344 FILE_CACHE. If it's non-zero, we
345 _may_ have cached pages. */
346 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */
348 struct list_head i_unsafe_writes; /* uncommitted sync writes */
349 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */
350 spinlock_t i_unsafe_lock;
352 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */
353 int i_snap_realm_counter; /* snap realm (if caps) */
354 struct list_head i_snap_realm_item;
355 struct list_head i_snap_flush_item;
357 struct work_struct i_wb_work; /* writeback work */
358 struct work_struct i_pg_inv_work; /* page invalidation work */
360 struct work_struct i_vmtruncate_work;
362 struct inode vfs_inode; /* at end */
365 static inline struct ceph_inode_info *ceph_inode(struct inode *inode)
367 return container_of(inode, struct ceph_inode_info, vfs_inode);
370 static inline void ceph_i_clear(struct inode *inode, unsigned mask)
372 struct ceph_inode_info *ci = ceph_inode(inode);
374 spin_lock(&inode->i_lock);
375 ci->i_ceph_flags &= ~mask;
376 spin_unlock(&inode->i_lock);
379 static inline void ceph_i_set(struct inode *inode, unsigned mask)
381 struct ceph_inode_info *ci = ceph_inode(inode);
383 spin_lock(&inode->i_lock);
384 ci->i_ceph_flags |= mask;
385 spin_unlock(&inode->i_lock);
388 static inline bool ceph_i_test(struct inode *inode, unsigned mask)
390 struct ceph_inode_info *ci = ceph_inode(inode);
394 r = (ci->i_ceph_flags & mask) == mask;
399 /* find a specific frag @f */
400 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci,
404 * choose fragment for value @v. copy frag content to pfrag, if leaf
407 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
408 struct ceph_inode_frag *pfrag,
414 struct ceph_dentry_info {
415 struct ceph_mds_session *lease_session;
416 u32 lease_gen, lease_shared_gen;
418 unsigned long lease_renew_after, lease_renew_from;
419 struct list_head lru;
420 struct dentry *dentry;
425 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry)
427 return (struct ceph_dentry_info *)dentry->d_fsdata;
430 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off)
432 return ((loff_t)frag << 32) | (loff_t)off;
436 * ino_t is <64 bits on many architectures, blech.
438 * don't include snap in ino hash, at least for now.
440 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino)
442 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */
443 #if BITS_PER_LONG == 32
444 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8;
451 static inline int ceph_set_ino_cb(struct inode *inode, void *data)
453 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
454 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
458 static inline struct ceph_vino ceph_vino(struct inode *inode)
460 return ceph_inode(inode)->i_vino;
463 /* for printf-style formatting */
464 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap
466 static inline u64 ceph_ino(struct inode *inode)
468 return ceph_inode(inode)->i_vino.ino;
470 static inline u64 ceph_snap(struct inode *inode)
472 return ceph_inode(inode)->i_vino.snap;
475 static inline int ceph_ino_compare(struct inode *inode, void *data)
477 struct ceph_vino *pvino = (struct ceph_vino *)data;
478 struct ceph_inode_info *ci = ceph_inode(inode);
479 return ci->i_vino.ino == pvino->ino &&
480 ci->i_vino.snap == pvino->snap;
483 static inline struct inode *ceph_find_inode(struct super_block *sb,
484 struct ceph_vino vino)
486 ino_t t = ceph_vino_to_ino(vino);
487 return ilookup5(sb, t, ceph_ino_compare, &vino);
494 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci)
496 return !RB_EMPTY_ROOT(&ci->i_caps);
499 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented);
500 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t);
501 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci,
502 struct ceph_cap *cap);
504 static inline int ceph_caps_issued(struct ceph_inode_info *ci)
507 spin_lock(&ci->vfs_inode.i_lock);
508 issued = __ceph_caps_issued(ci, NULL);
509 spin_unlock(&ci->vfs_inode.i_lock);
513 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask,
517 spin_lock(&ci->vfs_inode.i_lock);
518 r = __ceph_caps_issued_mask(ci, mask, touch);
519 spin_unlock(&ci->vfs_inode.i_lock);
523 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci)
525 return ci->i_dirty_caps | ci->i_flushing_caps;
527 extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask);
529 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask);
530 extern int __ceph_caps_used(struct ceph_inode_info *ci);
532 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci);
535 * wanted, by virtue of open file modes AND cap refs (buffered/cached data)
537 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
539 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci);
540 if (w & CEPH_CAP_FILE_BUFFER)
541 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */
545 /* what the mds thinks we want */
546 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci);
548 extern void ceph_caps_init(void);
549 extern void ceph_caps_finalize(void);
550 extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need);
551 extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx);
552 extern void ceph_reservation_status(struct ceph_client *client,
553 int *total, int *avail, int *used,
556 static inline struct ceph_client *ceph_inode_to_client(struct inode *inode)
558 return (struct ceph_client *)inode->i_sb->s_fs_info;
561 static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb)
563 return (struct ceph_client *)sb->s_fs_info;
566 static inline int ceph_queue_writeback(struct inode *inode)
568 return queue_work(ceph_inode_to_client(inode)->wb_wq,
569 &ceph_inode(inode)->i_wb_work);
572 static inline int ceph_queue_page_invalidation(struct inode *inode)
574 return queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
575 &ceph_inode(inode)->i_pg_inv_work);
580 * we keep buffered readdir results attached to file->private_data
582 struct ceph_file_info {
583 int fmode; /* initialized on open */
585 /* readdir: position within the dir */
587 struct ceph_mds_request *last_readdir;
590 /* readdir: position within a frag */
591 unsigned offset; /* offset of last chunk, adjusted for . and .. */
592 u64 next_offset; /* offset of next chunk (last_name's + 1) */
593 char *last_name; /* last entry in previous chunk */
594 struct dentry *dentry; /* next dentry (for dcache readdir) */
595 unsigned long dir_release_count;
597 /* used for -o dirstat read() on directory thing */
609 * A "snap context" is the set of existing snapshots when we
610 * write data. It is used by the OSD to guide its COW behavior.
612 * The ceph_snap_context is refcounted, and attached to each dirty
613 * page, indicating which context the dirty data belonged when it was
616 struct ceph_snap_context {
623 static inline struct ceph_snap_context *
624 ceph_get_snap_context(struct ceph_snap_context *sc)
627 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
628 atomic_read(&sc->nref)+1);
631 atomic_inc(&sc->nref);
635 static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
640 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
641 atomic_read(&sc->nref)-1);
643 if (atomic_dec_and_test(&sc->nref)) {
644 /*printk(" deleting snap_context %p\n", sc);*/
650 * A "snap realm" describes a subset of the file hierarchy sharing
651 * the same set of snapshots that apply to it. The realms themselves
652 * are organized into a hierarchy, such that children inherit (some of)
653 * the snapshots of their parents.
655 * All inodes within the realm that have capabilities are linked into a
658 struct ceph_snap_realm {
663 u64 parent_since; /* snapid when our current parent became so */
665 u64 *prior_parent_snaps; /* snaps inherited from any parents we */
666 int num_prior_parent_snaps; /* had prior to parent_since */
667 u64 *snaps; /* snaps specific to this realm */
670 struct ceph_snap_realm *parent;
671 struct list_head children; /* list of child realms */
672 struct list_head child_item;
674 struct list_head empty_item; /* if i have ref==0 */
676 /* the current set of snaps for this realm */
677 struct ceph_snap_context *cached_context;
679 struct list_head inodes_with_caps;
680 spinlock_t inodes_with_caps_lock;
686 * calculate the number of pages a given length and offset map onto,
687 * if we align the data.
689 static inline int calc_pages_for(u64 off, u64 len)
691 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
692 (off >> PAGE_CACHE_SHIFT);
698 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
700 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
701 struct ceph_snap_realm *realm);
702 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
703 struct ceph_snap_realm *realm);
704 extern int ceph_update_snap_trace(struct ceph_mds_client *m,
705 void *p, void *e, bool deletion);
706 extern void ceph_handle_snap(struct ceph_mds_client *mdsc,
707 struct ceph_msg *msg);
708 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci,
709 struct ceph_snap_context *snapc);
710 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
711 struct ceph_cap_snap *capsnap);
712 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc);
715 * a cap_snap is "pending" if it is still awaiting an in-progress
716 * sync write (that may/may not still update size, mtime, etc.).
718 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci)
720 return !list_empty(&ci->i_cap_snaps) &&
721 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap,
727 extern struct kmem_cache *ceph_inode_cachep;
728 extern struct kmem_cache *ceph_cap_cachep;
729 extern struct kmem_cache *ceph_dentry_cachep;
730 extern struct kmem_cache *ceph_file_cachep;
732 extern const char *ceph_msg_type_name(int type);
734 #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \
735 "%02x%02x%02x%02x%02x%02x"
736 #define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \
737 (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \
738 (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \
739 (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15]
742 extern const struct inode_operations ceph_file_iops;
744 extern struct inode *ceph_alloc_inode(struct super_block *sb);
745 extern void ceph_destroy_inode(struct inode *inode);
747 extern struct inode *ceph_get_inode(struct super_block *sb,
748 struct ceph_vino vino);
749 extern struct inode *ceph_get_snapdir(struct inode *parent);
750 extern int ceph_fill_file_size(struct inode *inode, int issued,
751 u32 truncate_seq, u64 truncate_size, u64 size);
752 extern void ceph_fill_file_time(struct inode *inode, int issued,
753 u64 time_warp_seq, struct timespec *ctime,
754 struct timespec *mtime, struct timespec *atime);
755 extern int ceph_fill_trace(struct super_block *sb,
756 struct ceph_mds_request *req,
757 struct ceph_mds_session *session);
758 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req,
759 struct ceph_mds_session *session);
761 extern int ceph_inode_holds_cap(struct inode *inode, int mask);
763 extern int ceph_inode_set_size(struct inode *inode, loff_t size);
764 extern void ceph_inode_writeback(struct work_struct *work);
765 extern void ceph_vmtruncate_work(struct work_struct *work);
766 extern void __ceph_do_pending_vmtruncate(struct inode *inode);
767 extern void __ceph_queue_vmtruncate(struct inode *inode);
769 extern int ceph_do_getattr(struct inode *inode, int mask);
770 extern int ceph_permission(struct inode *inode, int mask);
771 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr);
772 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
776 extern int ceph_setxattr(struct dentry *, const char *, const void *,
778 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
779 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
780 extern int ceph_removexattr(struct dentry *, const char *);
781 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci);
782 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
785 extern const char *ceph_cap_string(int c);
786 extern void ceph_handle_caps(struct ceph_mds_session *session,
787 struct ceph_msg *msg);
788 extern int ceph_add_cap(struct inode *inode,
789 struct ceph_mds_session *session, u64 cap_id,
790 int fmode, unsigned issued, unsigned wanted,
791 unsigned cap, unsigned seq, u64 realmino, int flags,
792 struct ceph_cap_reservation *caps_reservation);
793 extern void __ceph_remove_cap(struct ceph_cap *cap,
794 struct ceph_cap_reservation *ctx);
795 static inline void ceph_remove_cap(struct ceph_cap *cap)
797 struct inode *inode = &cap->ci->vfs_inode;
798 spin_lock(&inode->i_lock);
799 __ceph_remove_cap(cap, NULL);
800 spin_unlock(&inode->i_lock);
803 extern void ceph_queue_caps_release(struct inode *inode);
804 extern int ceph_write_inode(struct inode *inode, int unused);
805 extern int ceph_fsync(struct file *file, struct dentry *dentry, int datasync);
806 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
807 struct ceph_mds_session *session);
808 extern int ceph_get_cap_mds(struct inode *inode);
809 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps);
810 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had);
811 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
812 struct ceph_snap_context *snapc);
813 extern void __ceph_flush_snaps(struct ceph_inode_info *ci,
814 struct ceph_mds_session **psession);
815 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags,
816 struct ceph_mds_session *session);
817 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc);
818 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc);
820 extern int ceph_encode_inode_release(void **p, struct inode *inode,
821 int mds, int drop, int unless, int force);
822 extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
823 int mds, int drop, int unless);
825 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want,
826 int *got, loff_t endoff);
828 /* for counting open files by mode */
829 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode)
831 ci->i_nr_by_mode[mode]++;
833 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode);
836 extern const struct address_space_operations ceph_aops;
837 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma);
840 extern const struct file_operations ceph_file_fops;
841 extern const struct address_space_operations ceph_aops;
842 extern int ceph_open(struct inode *inode, struct file *file);
843 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry,
844 struct nameidata *nd, int mode,
846 extern int ceph_release(struct inode *inode, struct file *filp);
847 extern void ceph_release_page_vector(struct page **pages, int num_pages);
850 extern const struct file_operations ceph_dir_fops;
851 extern const struct inode_operations ceph_dir_iops;
852 extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops,
853 ceph_snapdir_dentry_ops;
855 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry);
856 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
857 struct dentry *dentry, int err);
859 extern void ceph_dentry_lru_add(struct dentry *dn);
860 extern void ceph_dentry_lru_touch(struct dentry *dn);
861 extern void ceph_dentry_lru_del(struct dentry *dn);
864 * our d_ops vary depending on whether the inode is live,
865 * snapshotted (read-only), or a virtual ".snap" directory.
867 int ceph_init_dentry(struct dentry *dentry);
871 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
874 extern const struct export_operations ceph_export_ops;
877 extern int ceph_debugfs_init(void);
878 extern void ceph_debugfs_cleanup(void);
879 extern int ceph_debugfs_client_init(struct ceph_client *client);
880 extern void ceph_debugfs_client_cleanup(struct ceph_client *client);
882 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry)
884 if (dentry && dentry->d_parent)
885 return dentry->d_parent->d_inode;
890 #endif /* _FS_CEPH_SUPER_H */