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

#ifndef _FS_CEPH_LIBCEPH_H
#define _FS_CEPH_LIBCEPH_H

#include "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 "types.h"
#include "messenger.h"
#include "msgpool.h"
#include "mon_client.h"
#include "osd_client.h"
#include "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_timeout;
	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_TIMEOUT_DEFAULT    60  /* seconds */
#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_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 *);

	u32 supported_features;
	u32 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[];
};

static inline struct ceph_snap_context *
ceph_get_snap_context(struct ceph_snap_context *sc)
{
	/*
	printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	       atomic_read(&sc->nref)+1);
	*/
	if (sc)
		atomic_inc(&sc->nref);
	return sc;
}

static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
{
	if (!sc)
		return;
	/*
	printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	       atomic_read(&sc->nref)-1);
	*/
	if (atomic_dec_and_test(&sc->nref)) {
		/*printk(" deleting snap_context %p\n", sc);*/
		kfree(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);
}

/* ceph_common.c */
extern const char *ceph_msg_type_name(int type);
extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
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;

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,
					      unsigned supported_features,
					      unsigned 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 char __user *data,
						 int num_pages,
						 bool write_page);
extern void ceph_put_page_vector(struct page **pages, int num_pages,
				 bool dirty);
extern void ceph_release_page_vector(struct page **pages, int num_pages);
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 char __user *data,
					 loff_t off, size_t len);
extern int ceph_copy_to_page_vector(struct page **pages,
				    const char *data,
				    loff_t off, size_t len);
extern int ceph_copy_from_page_vector(struct page **pages,
				    char *data,
				    loff_t off, size_t len);
extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *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
	4	#include "ceph_debug.h"
	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
	18	#include "types.h"
	19	#include "messenger.h"
	20	#include "msgpool.h"
	21	#include "mon_client.h"
	22	#include "osd_client.h"
	23	#include "ceph_fs.h"
	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;
	46	int osd_timeout;
	47	int osd_keepalive_timeout;
	48
	49	/*
	50	* any type that can't be simply compared or doesn't need need
	51	* to be compared should go beyond this point,
	52	* ceph_compare_options() should be updated accordingly
	53	*/
	54
	55	struct ceph_entity_addr mon_addr; / should be the first
	56	pointer type of args */
	57	int num_mon;
	58	char *name;
8323c3aa	59	struct ceph_crypto_key *key;
3d14c5d2 YS	60	};
	61
	62	/*
	63	* defaults
	64	*/
	65	#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
	66	#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
	67	#define CEPH_OSD_KEEPALIVE_DEFAULT 5
	68	#define CEPH_OSD_IDLE_TTL_DEFAULT 60
3d14c5d2 YS	69
	70	#define CEPH_MSG_MAX_FRONT_LEN (1610241024)
	71	#define CEPH_MSG_MAX_DATA_LEN (1610241024)
	72
	73	#define CEPH_AUTH_NAME_DEFAULT "guest"
	74
	75	/*
	76	* Delay telling the MDS we no longer want caps, in case we reopen
	77	* the file. Delay a minimum amount of time, even if we send a cap
	78	* message for some other reason. Otherwise, take the oppotunity to
	79	* update the mds to avoid sending another message later.
	80	*/
	81	#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
	82	#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
	83
	84	#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
	85
	86	/* mount state */
	87	enum {
	88	CEPH_MOUNT_MOUNTING,
	89	CEPH_MOUNT_MOUNTED,
	90	CEPH_MOUNT_UNMOUNTING,
	91	CEPH_MOUNT_UNMOUNTED,
	92	CEPH_MOUNT_SHUTDOWN,
	93	};
	94
	95	/*
	96	* subtract jiffies
	97	*/
	98	static inline unsigned long time_sub(unsigned long a, unsigned long b)
	99	{
	100	BUG_ON(time_after(b, a));
	101	return (long)a - (long)b;
	102	}
	103
	104	struct ceph_mds_client;
	105
	106	/*
	107	* per client state
	108	*
	109	* possibly shared by multiple mount points, if they are
	110	* mounting the same ceph filesystem/cluster.
	111	*/
	112	struct ceph_client {
	113	struct ceph_fsid fsid;
	114	bool have_fsid;
	115
	116	void *private;
	117
	118	struct ceph_options *options;
	119
	120	struct mutex mount_mutex; /* serialize mount attempts */
	121	wait_queue_head_t auth_wq;
	122	int auth_err;
	123
	124	int (extra_mon_dispatch)(struct ceph_client , struct ceph_msg *);
	125
	126	u32 supported_features;
	127	u32 required_features;
	128
15d9882c	129	struct ceph_messenger msgr; /* messenger instance */
3d14c5d2 YS	130	struct ceph_mon_client monc;
	131	struct ceph_osd_client osdc;
	132
	133	#ifdef CONFIG_DEBUG_FS
	134	struct dentry *debugfs_dir;
	135	struct dentry *debugfs_monmap;
	136	struct dentry *debugfs_osdmap;
	137	#endif
	138	};
	139
	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 {
	155	atomic_t nref;
	156	u64 seq;
aa711ee3	157	u32 num_snaps;
3d14c5d2 YS	158	u64 snaps[];
	159	};
	160
	161	static inline struct ceph_snap_context *
	162	ceph_get_snap_context(struct ceph_snap_context *sc)
	163	{
	164	/*
	165	printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	166	atomic_read(&sc->nref)+1);
	167	*/
	168	if (sc)
	169	atomic_inc(&sc->nref);
	170	return sc;
	171	}
	172
	173	static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
	174	{
	175	if (!sc)
	176	return;
	177	/*
	178	printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
	179	atomic_read(&sc->nref)-1);
	180	*/
	181	if (atomic_dec_and_test(&sc->nref)) {
	182	/printk(" deleting snap_context %p\n", sc);/
	183	kfree(sc);
	184	}
	185	}
	186
	187	/*
	188	* calculate the number of pages a given length and offset map onto,
	189	* if we align the data.
	190	*/
	191	static inline int calc_pages_for(u64 off, u64 len)
	192	{
	193	return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
	194	(off >> PAGE_CACHE_SHIFT);
	195	}
	196
	197	/* ceph_common.c */
	198	extern const char *ceph_msg_type_name(int type);
	199	extern int ceph_check_fsid(struct ceph_client client, struct ceph_fsid fsid);
	200	extern struct kmem_cache *ceph_inode_cachep;
	201	extern struct kmem_cache *ceph_cap_cachep;
	202	extern struct kmem_cache *ceph_dentry_cachep;
	203	extern struct kmem_cache *ceph_file_cachep;
	204
ee57741c	205	extern struct ceph_options ceph_parse_options(char options,
3d14c5d2 YS	206	const char dev_name, const char dev_name_end,
	207	int (parse_extra_token)(char c, void *private),
	208	void *private);
	209	extern void ceph_destroy_options(struct ceph_options *opt);
	210	extern int ceph_compare_options(struct ceph_options *new_opt,
	211	struct ceph_client *client);
	212	extern struct ceph_client ceph_create_client(struct ceph_options opt,
6ab00d46 SW	213	void *private,
	214	unsigned supported_features,
	215	unsigned required_features);
3d14c5d2 YS	216	extern u64 ceph_client_id(struct ceph_client *client);
	217	extern void ceph_destroy_client(struct ceph_client *client);
	218	extern int __ceph_open_session(struct ceph_client *client,
	219	unsigned long started);
	220	extern int ceph_open_session(struct ceph_client *client);
	221
	222	/* pagevec.c */
	223	extern void ceph_release_page_vector(struct page **pages, int num_pages);
	224
	225	extern struct page *ceph_get_direct_page_vector(const char __user data,
b6aa5901 HC	226	int num_pages,
	227	bool write_page);
	228	extern void ceph_put_page_vector(struct page **pages, int num_pages,
	229	bool dirty);
3d14c5d2 YS	230	extern void ceph_release_page_vector(struct page **pages, int num_pages);
	231	extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
	232	extern int ceph_copy_user_to_page_vector(struct page **pages,
	233	const char __user *data,
	234	loff_t off, size_t len);
	235	extern int ceph_copy_to_page_vector(struct page **pages,
	236	const char *data,
	237	loff_t off, size_t len);
	238	extern int ceph_copy_from_page_vector(struct page **pages,
	239	char *data,
	240	loff_t off, size_t len);
	241	extern int ceph_copy_page_vector_to_user(struct page *pages, char __user data,
	242	loff_t off, size_t len);
	243	extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
	244
	245
	246	#endif /* _FS_CEPH_SUPER_H */