#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) /* 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 monc_ping_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_MONC_PING_TIMEOUT_DEFAULT	msecs_to_jiffies(30 * 1000) #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,}; 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 {	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_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);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 */