[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_DEFAULT   (0)

#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,
};

/*
 * subtract jiffies
 */
static inline unsigned long time_sub(unsigned long a, unsigned long b)
{
	BUG_ON(time_after(b, a));
	return (long)a - (long)b;
}

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;
#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);
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 */
	32
497888cf	33	#define CEPH_OPT_DEFAULT (0)
3d14c5d2 YS	34
	35	#define ceph_set_opt(client, opt) \
	36	(client)->options->flags \|= CEPH_OPT_##opt;
	37	#define ceph_test_opt(client, opt) \
	38	(!!((client)->options->flags & CEPH_OPT_##opt))
	39
	40	struct ceph_options {
	41	int flags;
	42	struct ceph_fsid fsid;
	43	struct ceph_entity_addr my_addr;
	44	int mount_timeout;
	45	int osd_idle_ttl;
3d14c5d2 YS	46	int osd_keepalive_timeout;
	47
	48	/*
	49	* any type that can't be simply compared or doesn't need need
	50	* to be compared should go beyond this point,
	51	* ceph_compare_options() should be updated accordingly
	52	*/
	53
	54	struct ceph_entity_addr mon_addr; / should be the first
	55	pointer type of args */
	56	int num_mon;
	57	char *name;
8323c3aa	58	struct ceph_crypto_key *key;
3d14c5d2 YS	59	};
	60
	61	/*
	62	* defaults
	63	*/
	64	#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
3d14c5d2 YS	65	#define CEPH_OSD_KEEPALIVE_DEFAULT 5
3d14c5d2 YS	66	#define CEPH_OSD_IDLE_TTL_DEFAULT 60
3d14c5d2 YS	67
3d14c5d2 YS	68	#define CEPH_MSG_MAX_FRONT_LEN (1610241024)
7b11ba37	69	#define CEPH_MSG_MAX_MIDDLE_LEN (1610241024)
3d14c5d2 YS	70	#define CEPH_MSG_MAX_DATA_LEN (1610241024)
	71
	72	#define CEPH_AUTH_NAME_DEFAULT "guest"
	73
	74	/*
	75	* Delay telling the MDS we no longer want caps, in case we reopen
	76	* the file. Delay a minimum amount of time, even if we send a cap
	77	* message for some other reason. Otherwise, take the oppotunity to
	78	* update the mds to avoid sending another message later.
	79	*/
	80	#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
	81	#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
	82
	83	#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
	84
	85	/* mount state */
	86	enum {
	87	CEPH_MOUNT_MOUNTING,
	88	CEPH_MOUNT_MOUNTED,
	89	CEPH_MOUNT_UNMOUNTING,
	90	CEPH_MOUNT_UNMOUNTED,
	91	CEPH_MOUNT_SHUTDOWN,
	92	};
	93
	94	/*
	95	* subtract jiffies
	96	*/
	97	static inline unsigned long time_sub(unsigned long a, unsigned long b)
	98	{
	99	BUG_ON(time_after(b, a));
	100	return (long)a - (long)b;
	101	}
	102
	103	struct ceph_mds_client;
	104
	105	/*
	106	* per client state
	107	*
	108	* possibly shared by multiple mount points, if they are
	109	* mounting the same ceph filesystem/cluster.
	110	*/
	111	struct ceph_client {
	112	struct ceph_fsid fsid;
	113	bool have_fsid;
	114
	115	void *private;
	116
	117	struct ceph_options *options;
	118
	119	struct mutex mount_mutex; /* serialize mount attempts */
	120	wait_queue_head_t auth_wq;
	121	int auth_err;
	122
	123	int (extra_mon_dispatch)(struct ceph_client , struct ceph_msg *);
	124
12b4629a ID	125	u64 supported_features;
12b4629a ID	126	u64 required_features;
3d14c5d2	127
15d9882c	128	struct ceph_messenger msgr; /* messenger instance */
3d14c5d2 YS	129	struct ceph_mon_client monc;
	130	struct ceph_osd_client osdc;
	131
	132	#ifdef CONFIG_DEBUG_FS
	133	struct dentry *debugfs_dir;
	134	struct dentry *debugfs_monmap;
	135	struct dentry *debugfs_osdmap;
	136	#endif
	137	};
	138
	139
	140
	141	/*
	142	* snapshots
	143	*/
	144
	145	/*
	146	* A "snap context" is the set of existing snapshots when we
	147	* write data. It is used by the OSD to guide its COW behavior.
	148	*
	149	* The ceph_snap_context is refcounted, and attached to each dirty
	150	* page, indicating which context the dirty data belonged when it was
	151	* dirtied.
	152	*/
	153	struct ceph_snap_context {
	154	atomic_t nref;
	155	u64 seq;
aa711ee3	156	u32 num_snaps;
3d14c5d2 YS	157	u64 snaps[];
	158	};
	159
4f0dcb10 AE	160	extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
	161	gfp_t gfp_flags);
	162	extern struct ceph_snap_context *ceph_get_snap_context(
	163	struct ceph_snap_context *sc);
	164	extern void ceph_put_snap_context(struct ceph_snap_context *sc);
3d14c5d2 YS	165
	166	/*
	167	* calculate the number of pages a given length and offset map onto,
	168	* if we align the data.
	169	*/
	170	static inline int calc_pages_for(u64 off, u64 len)
	171	{
	172	return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
	173	(off >> PAGE_CACHE_SHIFT);
	174	}
	175
eeb0bed5 ID	176	extern struct kmem_cache *ceph_inode_cachep;
	177	extern struct kmem_cache *ceph_cap_cachep;
	178	extern struct kmem_cache *ceph_dentry_cachep;
	179	extern struct kmem_cache *ceph_file_cachep;
	180
3d14c5d2	181	/* ceph_common.c */
72fe25e3 AE	182	extern bool libceph_compatible(void *data);
72fe25e3 AE	183
3d14c5d2 YS	184	extern const char *ceph_msg_type_name(int type);
3d14c5d2 YS	185	extern int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid);
eeb0bed5	186	extern void *ceph_kvmalloc(size_t size, gfp_t flags);
3d14c5d2	187
ee57741c	188	extern struct ceph_options ceph_parse_options(char options,
3d14c5d2 YS	189	const char dev_name, const char dev_name_end,
	190	int (parse_extra_token)(char c, void *private),
	191	void *private);
	192	extern void ceph_destroy_options(struct ceph_options *opt);
	193	extern int ceph_compare_options(struct ceph_options *new_opt,
	194	struct ceph_client *client);
	195	extern struct ceph_client ceph_create_client(struct ceph_options opt,
6ab00d46	196	void *private,
12b4629a ID	197	u64 supported_features,
12b4629a ID	198	u64 required_features);
3d14c5d2 YS	199	extern u64 ceph_client_id(struct ceph_client *client);
	200	extern void ceph_destroy_client(struct ceph_client *client);
	201	extern int __ceph_open_session(struct ceph_client *client,
	202	unsigned long started);
	203	extern int ceph_open_session(struct ceph_client *client);
	204
	205	/* pagevec.c */
	206	extern void ceph_release_page_vector(struct page **pages, int num_pages);
	207
b324814e	208	extern struct page *ceph_get_direct_page_vector(const void __user data,
b6aa5901 HC	209	int num_pages,
	210	bool write_page);
	211	extern void ceph_put_page_vector(struct page **pages, int num_pages,
	212	bool dirty);
3d14c5d2 YS	213	extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
3d14c5d2 YS	214	extern int ceph_copy_user_to_page_vector(struct page **pages,
b324814e	215	const void __user *data,
3d14c5d2	216	loff_t off, size_t len);
903bb32e	217	extern void ceph_copy_to_page_vector(struct page **pages,
b324814e	218	const void *data,
3d14c5d2	219	loff_t off, size_t len);
903bb32e	220	extern void ceph_copy_from_page_vector(struct page **pages,
b324814e	221	void *data,
3d14c5d2	222	loff_t off, size_t len);
3d14c5d2 YS	223	extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
	224
	225
	226	#endif /* _FS_CEPH_SUPER_H */