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

#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/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>

/*
 * 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) /* not require cephx message signature */
#define CEPH_OPT_TCP_NODELAY	  (1<<5) /* TCP_NODELAY on TCP sockets */

#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;
	int mount_timeout;
	int osd_idle_ttl;
	int osd_keepalive_timeout;

	/*
	 * 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  60
#define CEPH_OSD_KEEPALIVE_DEFAULT  5
#define CEPH_OSD_IDLE_TTL_DEFAULT    60

#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"

/*
 * Delay telling the MDS we no longer want caps, in case we reopen
 * the file.  Delay a minimum amount of time, even if we send a cap
 * message for some other reason.  Otherwise, take the oppotunity to
 * update the mds to avoid sending another message later.
 */
#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT      5  /* cap release delay */
#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT     60  /* cap release delay */

#define CEPH_CAP_RELEASE_SAFETY_DEFAULT        (CEPH_CAPS_PER_RELEASE * 4)

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

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
};


/*
 * 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 {
	atomic_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_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
		(off >> PAGE_CACHE_SHIFT);
}

extern struct kmem_cache *ceph_inode_cachep;
extern struct kmem_cache *ceph_cap_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);
extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
					      void *private,
					      u64 supported_features,
					      u64 required_features);
extern u64 ceph_client_id(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
3d14c5d2 YS	1	#ifndef _FS_CEPH_LIBCEPH_H
	2	#define _FS_CEPH_LIBCEPH_H
	3
a1ce3928	4	#include <linux/ceph/ceph_debug.h>
3d14c5d2 YS	5
	6	#include <asm/unaligned.h>
	7	#include <linux/backing-dev.h>
	8	#include <linux/completion.h>
	9	#include <linux/exportfs.h>
187f1882	10	#include <linux/bug.h>
3d14c5d2 YS	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
a1ce3928 DH	18	#include <linux/ceph/types.h>
	19	#include <linux/ceph/messenger.h>
	20	#include <linux/ceph/msgpool.h>
	21	#include <linux/ceph/mon_client.h>
	22	#include <linux/ceph/osd_client.h>
	23	#include <linux/ceph/ceph_fs.h>
3d14c5d2	24
3d14c5d2 YS	25	/*
	26	* mount options
	27	*/
	28	#define CEPH_OPT_FSID (1<<0)
	29	#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
	30	#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
	31	#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
a3fc9800	32	#define CEPH_OPT_NOMSGAUTH (1<<4) /* not require cephx message signature */
ba988f87	33	#define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
3d14c5d2	34
ba988f87	35	#define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
3d14c5d2 YS	36
	37	#define ceph_set_opt(client, opt) \
	38	(client)->options->flags \|= CEPH_OPT_##opt;
	39	#define ceph_test_opt(client, opt) \
	40	(!!((client)->options->flags & CEPH_OPT_##opt))
	41
	42	struct ceph_options {
	43	int flags;
	44	struct ceph_fsid fsid;
	45	struct ceph_entity_addr my_addr;
	46	int mount_timeout;
	47	int osd_idle_ttl;
3d14c5d2 YS	48	int osd_keepalive_timeout;
	49
	50	/*
	51	* any type that can't be simply compared or doesn't need need
	52	* to be compared should go beyond this point,
	53	* ceph_compare_options() should be updated accordingly
	54	*/
	55
	56	struct ceph_entity_addr mon_addr; / should be the first
	57	pointer type of args */
	58	int num_mon;
	59	char *name;
8323c3aa	60	struct ceph_crypto_key *key;
3d14c5d2 YS	61	};
	62
	63	/*
	64	* defaults
	65	*/
	66	#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
3d14c5d2 YS	67	#define CEPH_OSD_KEEPALIVE_DEFAULT 5
3d14c5d2 YS	68	#define CEPH_OSD_IDLE_TTL_DEFAULT 60
3d14c5d2 YS	69
3d14c5d2 YS	70	#define CEPH_MSG_MAX_FRONT_LEN (1610241024)
7b11ba37	71	#define CEPH_MSG_MAX_MIDDLE_LEN (1610241024)
3d14c5d2 YS	72	#define CEPH_MSG_MAX_DATA_LEN (1610241024)
	73
	74	#define CEPH_AUTH_NAME_DEFAULT "guest"
	75
	76	/*
	77	* Delay telling the MDS we no longer want caps, in case we reopen
	78	* the file. Delay a minimum amount of time, even if we send a cap
	79	* message for some other reason. Otherwise, take the oppotunity to
	80	* update the mds to avoid sending another message later.
	81	*/
	82	#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
	83	#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
	84
	85	#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
	86
	87	/* mount state */
	88	enum {
	89	CEPH_MOUNT_MOUNTING,
	90	CEPH_MOUNT_MOUNTED,
	91	CEPH_MOUNT_UNMOUNTING,
	92	CEPH_MOUNT_UNMOUNTED,
	93	CEPH_MOUNT_SHUTDOWN,
	94	};
	95
3d14c5d2 YS	96	struct ceph_mds_client;
	97
	98	/*
	99	* per client state
	100	*
	101	* possibly shared by multiple mount points, if they are
	102	* mounting the same ceph filesystem/cluster.
	103	*/
	104	struct ceph_client {
	105	struct ceph_fsid fsid;
	106	bool have_fsid;
	107
	108	void *private;
	109
	110	struct ceph_options *options;
	111
	112	struct mutex mount_mutex; /* serialize mount attempts */
	113	wait_queue_head_t auth_wq;
	114	int auth_err;
	115
	116	int (extra_mon_dispatch)(struct ceph_client , struct ceph_msg *);
	117
12b4629a ID	118	u64 supported_features;
12b4629a ID	119	u64 required_features;
3d14c5d2	120
15d9882c	121	struct ceph_messenger msgr; /* messenger instance */
3d14c5d2 YS	122	struct ceph_mon_client monc;
	123	struct ceph_osd_client osdc;
	124
	125	#ifdef CONFIG_DEBUG_FS
	126	struct dentry *debugfs_dir;
	127	struct dentry *debugfs_monmap;
	128	struct dentry *debugfs_osdmap;
5cf7bd30	129	struct dentry *debugfs_options;
3d14c5d2 YS	130	#endif
	131	};
	132
	133
	134
	135	/*
	136	* snapshots
	137	*/
	138
	139	/*
	140	* A "snap context" is the set of existing snapshots when we
	141	* write data. It is used by the OSD to guide its COW behavior.
	142	*
	143	* The ceph_snap_context is refcounted, and attached to each dirty
	144	* page, indicating which context the dirty data belonged when it was
	145	* dirtied.
	146	*/
	147	struct ceph_snap_context {
	148	atomic_t nref;
	149	u64 seq;
aa711ee3	150	u32 num_snaps;
3d14c5d2 YS	151	u64 snaps[];
	152	};
	153
4f0dcb10 AE	154	extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
	155	gfp_t gfp_flags);
	156	extern struct ceph_snap_context *ceph_get_snap_context(
	157	struct ceph_snap_context *sc);
	158	extern void ceph_put_snap_context(struct ceph_snap_context *sc);
3d14c5d2 YS	159
	160	/*
	161	* calculate the number of pages a given length and offset map onto,
	162	* if we align the data.
	163	*/
	164	static inline int calc_pages_for(u64 off, u64 len)
	165	{
	166	return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
	167	(off >> PAGE_CACHE_SHIFT);
	168	}
	169
eeb0bed5 ID	170	extern struct kmem_cache *ceph_inode_cachep;
	171	extern struct kmem_cache *ceph_cap_cachep;
	172	extern struct kmem_cache *ceph_dentry_cachep;
	173	extern struct kmem_cache *ceph_file_cachep;
	174
3d14c5d2	175	/* ceph_common.c */
72fe25e3 AE	176	extern bool libceph_compatible(void *data);
72fe25e3 AE	177
3d14c5d2 YS	178	extern const char *ceph_msg_type_name(int type);
3d14c5d2 YS	179	extern int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid);
eeb0bed5	180	extern void *ceph_kvmalloc(size_t size, gfp_t flags);
3d14c5d2	181
ee57741c	182	extern struct ceph_options ceph_parse_options(char options,
3d14c5d2 YS	183	const char dev_name, const char dev_name_end,
	184	int (parse_extra_token)(char c, void *private),
	185	void *private);
ff40f9ae	186	int ceph_print_client_options(struct seq_file m, struct ceph_client client);
3d14c5d2 YS	187	extern void ceph_destroy_options(struct ceph_options *opt);
	188	extern int ceph_compare_options(struct ceph_options *new_opt,
	189	struct ceph_client *client);
	190	extern struct ceph_client ceph_create_client(struct ceph_options opt,
6ab00d46	191	void *private,
12b4629a ID	192	u64 supported_features,
12b4629a ID	193	u64 required_features);
3d14c5d2 YS	194	extern u64 ceph_client_id(struct ceph_client *client);
	195	extern void ceph_destroy_client(struct ceph_client *client);
	196	extern int __ceph_open_session(struct ceph_client *client,
	197	unsigned long started);
	198	extern int ceph_open_session(struct ceph_client *client);
	199
	200	/* pagevec.c */
	201	extern void ceph_release_page_vector(struct page **pages, int num_pages);
	202
b324814e	203	extern struct page *ceph_get_direct_page_vector(const void __user data,
b6aa5901 HC	204	int num_pages,
	205	bool write_page);
	206	extern void ceph_put_page_vector(struct page **pages, int num_pages,
	207	bool dirty);
3d14c5d2 YS	208	extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
3d14c5d2 YS	209	extern int ceph_copy_user_to_page_vector(struct page **pages,
b324814e	210	const void __user *data,
3d14c5d2	211	loff_t off, size_t len);
903bb32e	212	extern void ceph_copy_to_page_vector(struct page **pages,
b324814e	213	const void *data,
3d14c5d2	214	loff_t off, size_t len);
903bb32e	215	extern void ceph_copy_from_page_vector(struct page **pages,
b324814e	216	void *data,
3d14c5d2	217	loff_t off, size_t len);
3d14c5d2 YS	218	extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
	219
	220
	221	#endif /* _FS_CEPH_SUPER_H */