Edit File: 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> #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 { 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); } #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) { \ gmb(); \ n = &(*n)->rb_left; \ } else if (cmp > 0) { \ gmb(); \ 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; extern struct kmem_cache *ceph_dir_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 int ceph_copy_page_vector_to_user(struct page **pages, void __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 */