[linux-2.6-block.git] / include / linux / ceph / libceph.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FS_CEPH_LIBCEPH_H
#define _FS_CEPH_LIBCEPH_H

#include <linux/ceph/ceph_debug.h>

#include <asm/unaligned.h>
#include <linux/backing-dev.h>
#include <linux/completion.h>
#include <linux/exportfs.h>
#include <linux/bug.h>
#include <linux/fs.h>
#include <linux/mempool.h>
#include <linux/pagemap.h>
#include <linux/wait.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/refcount.h>

#include <linux/ceph/types.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/msgpool.h>
#include <linux/ceph/mon_client.h>
#include <linux/ceph/osd_client.h>
#include <linux/ceph/ceph_fs.h>
#include <linux/ceph/string_table.h>

/*
 * mount options
 */
#define CEPH_OPT_FSID             (1<<0)
#define CEPH_OPT_NOSHARE          (1<<1) /* don't share client with other sbs */
#define CEPH_OPT_MYIP             (1<<2) /* specified my ip */
#define CEPH_OPT_NOCRC            (1<<3) /* no data crc on writes */
#define CEPH_OPT_NOMSGAUTH	  (1<<4) /* don't require msg signing feat */
#define CEPH_OPT_TCP_NODELAY	  (1<<5) /* TCP_NODELAY on TCP sockets */
#define CEPH_OPT_NOMSGSIGN	  (1<<6) /* don't sign msgs */

#define CEPH_OPT_DEFAULT   (CEPH_OPT_TCP_NODELAY)

#define ceph_set_opt(client, opt) \
	(client)->options->flags |= CEPH_OPT_##opt;
#define ceph_test_opt(client, opt) \
	(!!((client)->options->flags & CEPH_OPT_##opt))

struct ceph_options {
	int flags;
	struct ceph_fsid fsid;
	struct ceph_entity_addr my_addr;
	unsigned long mount_timeout;		/* jiffies */
	unsigned long osd_idle_ttl;		/* jiffies */
	unsigned long osd_keepalive_timeout;	/* jiffies */
	unsigned long osd_request_timeout;	/* jiffies */

	/*
	 * any type that can't be simply compared or doesn't need need
	 * to be compared should go beyond this point,
	 * ceph_compare_options() should be updated accordingly
	 */

	struct ceph_entity_addr *mon_addr; /* should be the first
					      pointer type of args */
	int num_mon;
	char *name;
	struct ceph_crypto_key *key;
};

/*
 * defaults
 */
#define CEPH_MOUNT_TIMEOUT_DEFAULT	msecs_to_jiffies(60 * 1000)
#define CEPH_OSD_KEEPALIVE_DEFAULT	msecs_to_jiffies(5 * 1000)
#define CEPH_OSD_IDLE_TTL_DEFAULT	msecs_to_jiffies(60 * 1000)
#define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0  /* no timeout */

#define CEPH_MONC_HUNT_INTERVAL		msecs_to_jiffies(3 * 1000)
#define CEPH_MONC_PING_INTERVAL		msecs_to_jiffies(10 * 1000)
#define CEPH_MONC_PING_TIMEOUT		msecs_to_jiffies(30 * 1000)
#define CEPH_MONC_HUNT_BACKOFF		2
#define CEPH_MONC_HUNT_MAX_MULT		10

#define CEPH_MSG_MAX_FRONT_LEN	(16*1024*1024)
#define CEPH_MSG_MAX_MIDDLE_LEN	(16*1024*1024)
#define CEPH_MSG_MAX_DATA_LEN	(16*1024*1024)

#define CEPH_AUTH_NAME_DEFAULT   "guest"

/* mount state */
enum {
	CEPH_MOUNT_MOUNTING,
	CEPH_MOUNT_MOUNTED,
	CEPH_MOUNT_UNMOUNTING,
	CEPH_MOUNT_UNMOUNTED,
	CEPH_MOUNT_SHUTDOWN,
};

static inline unsigned long ceph_timeout_jiffies(unsigned long timeout)
{
	return timeout ?: MAX_SCHEDULE_TIMEOUT;
}

struct ceph_mds_client;

/*
 * per client state
 *
 * possibly shared by multiple mount points, if they are
 * mounting the same ceph filesystem/cluster.
 */
struct ceph_client {
	struct ceph_fsid fsid;
	bool have_fsid;

	void *private;

	struct ceph_options *options;

	struct mutex mount_mutex;      /* serialize mount attempts */
	wait_queue_head_t auth_wq;
	int auth_err;

	int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);

	u64 supported_features;
	u64 required_features;

	struct ceph_messenger msgr;   /* messenger instance */
	struct ceph_mon_client monc;
	struct ceph_osd_client osdc;

#ifdef CONFIG_DEBUG_FS
	struct dentry *debugfs_dir;
	struct dentry *debugfs_monmap;
	struct dentry *debugfs_osdmap;
	struct dentry *debugfs_options;
#endif
};

#define from_msgr(ms)	container_of(ms, struct ceph_client, msgr)


/*
 * snapshots
 */

/*
 * A "snap context" is the set of existing snapshots when we
 * write data.  It is used by the OSD to guide its COW behavior.
 *
 * The ceph_snap_context is refcounted, and attached to each dirty
 * page, indicating which context the dirty data belonged when it was
 * dirtied.
 */
struct ceph_snap_context {
	refcount_t nref;
	u64 seq;
	u32 num_snaps;
	u64 snaps[];
};

extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
					gfp_t gfp_flags);
extern struct ceph_snap_context *ceph_get_snap_context(
					struct ceph_snap_context *sc);
extern void ceph_put_snap_context(struct ceph_snap_context *sc);

/*
 * calculate the number of pages a given length and offset map onto,
 * if we align the data.
 */
static inline int calc_pages_for(u64 off, u64 len)
{
	return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) -
		(off >> PAGE_SHIFT);
}

#define RB_BYVAL(a)      (a)
#define RB_BYPTR(a)      (&(a))
#define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b))

#define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
static void insert_##name(struct rb_root *root, type *t)		\
{									\
	struct rb_node **n = &root->rb_node;				\
	struct rb_node *parent = NULL;					\
									\
	BUG_ON(!RB_EMPTY_NODE(&t->nodefld));				\
									\
	while (*n) {							\
		type *cur = rb_entry(*n, type, nodefld);		\
		int cmp;						\
									\
		parent = *n;						\
		cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld));	\
		if (cmp < 0)						\
			n = &(*n)->rb_left;				\
		else if (cmp > 0)					\
			n = &(*n)->rb_right;				\
		else							\
			BUG();						\
	}								\
									\
	rb_link_node(&t->nodefld, parent, n);				\
	rb_insert_color(&t->nodefld, root);				\
}									\
static void erase_##name(struct rb_root *root, type *t)			\
{									\
	BUG_ON(RB_EMPTY_NODE(&t->nodefld));				\
	rb_erase(&t->nodefld, root);					\
	RB_CLEAR_NODE(&t->nodefld);					\
}

/*
 * @lookup_param_type is a parameter and not constructed from (@type,
 * @keyfld) with typeof() because adding const is too unwieldy.
 */
#define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp,	\
			       lookup_param_type, nodefld)		\
static type *lookup_##name(struct rb_root *root, lookup_param_type key)	\
{									\
	struct rb_node *n = root->rb_node;				\
									\
	while (n) {							\
		type *cur = rb_entry(n, type, nodefld);			\
		int cmp;						\
									\
		cmp = cmpexp(key, keyexp(cur->keyfld));			\
		if (cmp < 0)						\
			n = n->rb_left;					\
		else if (cmp > 0)					\
			n = n->rb_right;				\
		else							\
			return cur;					\
	}								\
									\
	return NULL;							\
}

#define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp,		\
			 lookup_param_type, nodefld)			\
DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld)	\
DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp,		\
		       lookup_param_type, nodefld)

/*
 * Shorthands for integer keys.
 */
#define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld)		\
DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld)

#define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)		\
extern type __lookup_##name##_key;					\
DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL,	\
		       typeof(__lookup_##name##_key.keyfld), nodefld)

#define DEFINE_RB_FUNCS(name, type, keyfld, nodefld)			\
DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld)			\
DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)

extern struct kmem_cache *ceph_inode_cachep;
extern struct kmem_cache *ceph_cap_cachep;
extern struct kmem_cache *ceph_cap_flush_cachep;
extern struct kmem_cache *ceph_dentry_cachep;
extern struct kmem_cache *ceph_file_cachep;

/* ceph_common.c */
extern bool libceph_compatible(void *data);

extern const char *ceph_msg_type_name(int type);
extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
extern void *ceph_kvmalloc(size_t size, gfp_t flags);

extern struct ceph_options *ceph_parse_options(char *options,
			      const char *dev_name, const char *dev_name_end,
			      int (*parse_extra_token)(char *c, void *private),
			      void *private);
int ceph_print_client_options(struct seq_file *m, struct ceph_client *client);
extern void ceph_destroy_options(struct ceph_options *opt);
extern int ceph_compare_options(struct ceph_options *new_opt,
				struct ceph_client *client);
struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private);
struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client);
u64 ceph_client_gid(struct ceph_client *client);
extern void ceph_destroy_client(struct ceph_client *client);
extern int __ceph_open_session(struct ceph_client *client,
			       unsigned long started);
extern int ceph_open_session(struct ceph_client *client);

/* pagevec.c */
extern void ceph_release_page_vector(struct page **pages, int num_pages);

extern struct page **ceph_get_direct_page_vector(const void __user *data,
						 int num_pages,
						 bool write_page);
extern void ceph_put_page_vector(struct page **pages, int num_pages,
				 bool dirty);
extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
extern int ceph_copy_user_to_page_vector(struct page **pages,
					 const void __user *data,
					 loff_t off, size_t len);
extern void ceph_copy_to_page_vector(struct page **pages,
				    const void *data,
				    loff_t off, size_t len);
extern void ceph_copy_from_page_vector(struct page **pages,
				    void *data,
				    loff_t off, size_t len);
extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);


#endif /* _FS_CEPH_SUPER_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
3d14c5d2 YS	2	#ifndef _FS_CEPH_LIBCEPH_H
	3	#define _FS_CEPH_LIBCEPH_H
	4
a1ce3928	5	#include <linux/ceph/ceph_debug.h>
3d14c5d2 YS	6
	7	#include <asm/unaligned.h>
	8	#include <linux/backing-dev.h>
	9	#include <linux/completion.h>
	10	#include <linux/exportfs.h>
187f1882	11	#include <linux/bug.h>
3d14c5d2 YS	12	#include <linux/fs.h>
	13	#include <linux/mempool.h>
	14	#include <linux/pagemap.h>
	15	#include <linux/wait.h>
	16	#include <linux/writeback.h>
	17	#include <linux/slab.h>
06dfa963	18	#include <linux/refcount.h>
3d14c5d2	19
a1ce3928 DH	20	#include <linux/ceph/types.h>
	21	#include <linux/ceph/messenger.h>
	22	#include <linux/ceph/msgpool.h>
	23	#include <linux/ceph/mon_client.h>
	24	#include <linux/ceph/osd_client.h>
	25	#include <linux/ceph/ceph_fs.h>
51e92737	26	#include <linux/ceph/string_table.h>
3d14c5d2	27
3d14c5d2 YS	28	/*
	29	* mount options
	30	*/
	31	#define CEPH_OPT_FSID (1<<0)
	32	#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
	33	#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
	34	#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
a51983e4	35	#define CEPH_OPT_NOMSGAUTH (1<<4) /* don't require msg signing feat */
ba988f87	36	#define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
a51983e4	37	#define CEPH_OPT_NOMSGSIGN (1<<6) /* don't sign msgs */
3d14c5d2	38
ba988f87	39	#define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
3d14c5d2 YS	40
	41	#define ceph_set_opt(client, opt) \
	42	(client)->options->flags \|= CEPH_OPT_##opt;
	43	#define ceph_test_opt(client, opt) \
	44	(!!((client)->options->flags & CEPH_OPT_##opt))
	45
	46	struct ceph_options {
	47	int flags;
	48	struct ceph_fsid fsid;
	49	struct ceph_entity_addr my_addr;
a319bf56 ID	50	unsigned long mount_timeout; /* jiffies */
	51	unsigned long osd_idle_ttl; /* jiffies */
	52	unsigned long osd_keepalive_timeout; /* jiffies */
7cc5e38f	53	unsigned long osd_request_timeout; /* jiffies */
3d14c5d2 YS	54
	55	/*
	56	* any type that can't be simply compared or doesn't need need
	57	* to be compared should go beyond this point,
	58	* ceph_compare_options() should be updated accordingly
	59	*/
	60
	61	struct ceph_entity_addr mon_addr; / should be the first
	62	pointer type of args */
	63	int num_mon;
	64	char *name;
8323c3aa	65	struct ceph_crypto_key *key;
3d14c5d2 YS	66	};
	67
	68	/*
	69	* defaults
	70	*/
a319bf56 ID	71	#define CEPH_MOUNT_TIMEOUT_DEFAULT msecs_to_jiffies(60 * 1000)
	72	#define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000)
	73	#define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000)
7cc5e38f	74	#define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0 /* no timeout */
58d81b12	75
168b9090	76	#define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000)
58d81b12 ID	77	#define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000)
58d81b12 ID	78	#define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000)
168b9090 ID	79	#define CEPH_MONC_HUNT_BACKOFF 2
168b9090 ID	80	#define CEPH_MONC_HUNT_MAX_MULT 10
3d14c5d2 YS	81
3d14c5d2 YS	82	#define CEPH_MSG_MAX_FRONT_LEN (1610241024)
7b11ba37	83	#define CEPH_MSG_MAX_MIDDLE_LEN (1610241024)
3d14c5d2 YS	84	#define CEPH_MSG_MAX_DATA_LEN (1610241024)
	85
	86	#define CEPH_AUTH_NAME_DEFAULT "guest"
	87
3d14c5d2 YS	88	/* mount state */
	89	enum {
	90	CEPH_MOUNT_MOUNTING,
	91	CEPH_MOUNT_MOUNTED,
	92	CEPH_MOUNT_UNMOUNTING,
	93	CEPH_MOUNT_UNMOUNTED,
	94	CEPH_MOUNT_SHUTDOWN,
	95	};
	96
a319bf56 ID	97	static inline unsigned long ceph_timeout_jiffies(unsigned long timeout)
	98	{
	99	return timeout ?: MAX_SCHEDULE_TIMEOUT;
	100	}
	101
3d14c5d2 YS	102	struct ceph_mds_client;
	103
	104	/*
	105	* per client state
	106	*
	107	* possibly shared by multiple mount points, if they are
	108	* mounting the same ceph filesystem/cluster.
	109	*/
	110	struct ceph_client {
	111	struct ceph_fsid fsid;
	112	bool have_fsid;
	113
	114	void *private;
	115
	116	struct ceph_options *options;
	117
	118	struct mutex mount_mutex; /* serialize mount attempts */
	119	wait_queue_head_t auth_wq;
	120	int auth_err;
	121
	122	int (extra_mon_dispatch)(struct ceph_client , struct ceph_msg *);
	123
12b4629a ID	124	u64 supported_features;
12b4629a ID	125	u64 required_features;
3d14c5d2	126
15d9882c	127	struct ceph_messenger msgr; /* messenger instance */
3d14c5d2 YS	128	struct ceph_mon_client monc;
	129	struct ceph_osd_client osdc;
	130
	131	#ifdef CONFIG_DEBUG_FS
	132	struct dentry *debugfs_dir;
	133	struct dentry *debugfs_monmap;
	134	struct dentry *debugfs_osdmap;
5cf7bd30	135	struct dentry *debugfs_options;
3d14c5d2 YS	136	#endif
	137	};
	138
859bff51	139	#define from_msgr(ms) container_of(ms, struct ceph_client, msgr)
3d14c5d2 YS	140
	141
	142	/*
	143	* snapshots
	144	*/
	145
	146	/*
	147	* A "snap context" is the set of existing snapshots when we
	148	* write data. It is used by the OSD to guide its COW behavior.
	149	*
	150	* The ceph_snap_context is refcounted, and attached to each dirty
	151	* page, indicating which context the dirty data belonged when it was
	152	* dirtied.
	153	*/
	154	struct ceph_snap_context {
06dfa963	155	refcount_t nref;
3d14c5d2	156	u64 seq;
aa711ee3	157	u32 num_snaps;
3d14c5d2 YS	158	u64 snaps[];
	159	};
	160
4f0dcb10 AE	161	extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
	162	gfp_t gfp_flags);
	163	extern struct ceph_snap_context *ceph_get_snap_context(
	164	struct ceph_snap_context *sc);
	165	extern void ceph_put_snap_context(struct ceph_snap_context *sc);
3d14c5d2 YS	166
	167	/*
	168	* calculate the number of pages a given length and offset map onto,
	169	* if we align the data.
	170	*/
	171	static inline int calc_pages_for(u64 off, u64 len)
	172	{
09cbfeaf KS	173	return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) -
09cbfeaf KS	174	(off >> PAGE_SHIFT);
3d14c5d2 YS	175	}
3d14c5d2 YS	176
76f827a7 ID	177	#define RB_BYVAL(a) (a)
	178	#define RB_BYPTR(a) (&(a))
	179	#define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b))
	180
	181	#define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
fcd00b68 ID	182	static void insert_##name(struct rb_root root, type t) \
	183	{ \
	184	struct rb_node **n = &root->rb_node; \
	185	struct rb_node *parent = NULL; \
	186	\
	187	BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \
	188	\
	189	while (*n) { \
	190	type cur = rb_entry(n, type, nodefld); \
76f827a7	191	int cmp; \
fcd00b68 ID	192	\
fcd00b68 ID	193	parent = *n; \
76f827a7 ID	194	cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \
76f827a7 ID	195	if (cmp < 0) \
fcd00b68	196	n = &(*n)->rb_left; \
76f827a7	197	else if (cmp > 0) \
fcd00b68 ID	198	n = &(*n)->rb_right; \
	199	else \
	200	BUG(); \
	201	} \
	202	\
	203	rb_link_node(&t->nodefld, parent, n); \
	204	rb_insert_color(&t->nodefld, root); \
	205	} \
	206	static void erase_##name(struct rb_root root, type t) \
	207	{ \
	208	BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \
	209	rb_erase(&t->nodefld, root); \
	210	RB_CLEAR_NODE(&t->nodefld); \
	211	}
	212
76f827a7 ID	213	/*
	214	* @lookup_param_type is a parameter and not constructed from (@type,
	215	* @keyfld) with typeof() because adding const is too unwieldy.
	216	*/
	217	#define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
	218	lookup_param_type, nodefld) \
	219	static type lookup_##name(struct rb_root root, lookup_param_type key) \
fcd00b68 ID	220	{ \
	221	struct rb_node *n = root->rb_node; \
	222	\
	223	while (n) { \
	224	type *cur = rb_entry(n, type, nodefld); \
76f827a7	225	int cmp; \
fcd00b68	226	\
76f827a7 ID	227	cmp = cmpexp(key, keyexp(cur->keyfld)); \
76f827a7 ID	228	if (cmp < 0) \
fcd00b68	229	n = n->rb_left; \
76f827a7	230	else if (cmp > 0) \
fcd00b68 ID	231	n = n->rb_right; \
	232	else \
	233	return cur; \
	234	} \
	235	\
	236	return NULL; \
	237	}
	238
76f827a7 ID	239	#define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \
	240	lookup_param_type, nodefld) \
	241	DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
	242	DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
	243	lookup_param_type, nodefld)
	244
	245	/*
	246	* Shorthands for integer keys.
	247	*/
	248	#define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
	249	DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld)
	250
	251	#define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \
	252	extern type __lookup_##name##_key; \
	253	DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \
	254	typeof(__lookup_##name##_key.keyfld), nodefld)
	255
fcd00b68 ID	256	#define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \
	257	DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
	258	DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)
	259
eeb0bed5 ID	260	extern struct kmem_cache *ceph_inode_cachep;
eeb0bed5 ID	261	extern struct kmem_cache *ceph_cap_cachep;
f66fd9f0	262	extern struct kmem_cache *ceph_cap_flush_cachep;
eeb0bed5 ID	263	extern struct kmem_cache *ceph_dentry_cachep;
	264	extern struct kmem_cache *ceph_file_cachep;
	265
3d14c5d2	266	/* ceph_common.c */
72fe25e3 AE	267	extern bool libceph_compatible(void *data);
72fe25e3 AE	268
3d14c5d2 YS	269	extern const char *ceph_msg_type_name(int type);
3d14c5d2 YS	270	extern int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid);
eeb0bed5	271	extern void *ceph_kvmalloc(size_t size, gfp_t flags);
3d14c5d2	272
ee57741c	273	extern struct ceph_options ceph_parse_options(char options,
3d14c5d2 YS	274	const char dev_name, const char dev_name_end,
	275	int (parse_extra_token)(char c, void *private),
	276	void *private);
ff40f9ae	277	int ceph_print_client_options(struct seq_file m, struct ceph_client client);
3d14c5d2 YS	278	extern void ceph_destroy_options(struct ceph_options *opt);
	279	extern int ceph_compare_options(struct ceph_options *new_opt,
	280	struct ceph_client *client);
74da4a0f	281	struct ceph_client ceph_create_client(struct ceph_options opt, void *private);
005a07bf	282	struct ceph_entity_addr ceph_client_addr(struct ceph_client client);
033268a5	283	u64 ceph_client_gid(struct ceph_client *client);
3d14c5d2 YS	284	extern void ceph_destroy_client(struct ceph_client *client);
	285	extern int __ceph_open_session(struct ceph_client *client,
	286	unsigned long started);
	287	extern int ceph_open_session(struct ceph_client *client);
	288
	289	/* pagevec.c */
	290	extern void ceph_release_page_vector(struct page **pages, int num_pages);
	291
b324814e	292	extern struct page *ceph_get_direct_page_vector(const void __user data,
b6aa5901 HC	293	int num_pages,
	294	bool write_page);
	295	extern void ceph_put_page_vector(struct page **pages, int num_pages,
	296	bool dirty);
3d14c5d2 YS	297	extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
3d14c5d2 YS	298	extern int ceph_copy_user_to_page_vector(struct page **pages,
b324814e	299	const void __user *data,
3d14c5d2	300	loff_t off, size_t len);
903bb32e	301	extern void ceph_copy_to_page_vector(struct page **pages,
b324814e	302	const void *data,
3d14c5d2	303	loff_t off, size_t len);
903bb32e	304	extern void ceph_copy_from_page_vector(struct page **pages,
b324814e	305	void *data,
3d14c5d2	306	loff_t off, size_t len);
3d14c5d2 YS	307	extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
	308
	309
	310	#endif /* _FS_CEPH_SUPER_H */