[linux-2.6-block.git] / fs / ceph / mds_client.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FS_CEPH_MDS_CLIENT_H
#define _FS_CEPH_MDS_CLIENT_H

#include <linux/completion.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/refcount.h>
#include <linux/utsname.h>

#include <linux/ceph/types.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/mdsmap.h>
#include <linux/ceph/auth.h>

/* The first 8 bits are reserved for old ceph releases */
#define CEPHFS_FEATURE_MIMIC		8
#define CEPHFS_FEATURE_REPLY_ENCODING	9
#define CEPHFS_FEATURE_RECLAIM_CLIENT	10
#define CEPHFS_FEATURE_LAZY_CAP_WANTED	11

#define CEPHFS_FEATURES_CLIENT_SUPPORTED { 	\
	0, 1, 2, 3, 4, 5, 6, 7,			\
	CEPHFS_FEATURE_MIMIC,			\
	CEPHFS_FEATURE_LAZY_CAP_WANTED,		\
}
#define CEPHFS_FEATURES_CLIENT_REQUIRED {}


/*
 * Some lock dependencies:
 *
 * session->s_mutex
 *         mdsc->mutex
 *
 *         mdsc->snap_rwsem
 *
 *         ci->i_ceph_lock
 *                 mdsc->snap_flush_lock
 *                 mdsc->cap_delay_lock
 *
 */

struct ceph_fs_client;
struct ceph_cap;

/*
 * parsed info about a single inode.  pointers are into the encoded
 * on-wire structures within the mds reply message payload.
 */
struct ceph_mds_reply_info_in {
	struct ceph_mds_reply_inode *in;
	struct ceph_dir_layout dir_layout;
	u32 symlink_len;
	char *symlink;
	u32 xattr_len;
	char *xattr_data;
	u64 inline_version;
	u32 inline_len;
	char *inline_data;
	u32 pool_ns_len;
	char *pool_ns_data;
	u64 max_bytes;
	u64 max_files;
};

struct ceph_mds_reply_dir_entry {
	char                          *name;
	u32                           name_len;
	struct ceph_mds_reply_lease   *lease;
	struct ceph_mds_reply_info_in inode;
	loff_t			      offset;
};

/*
 * parsed info about an mds reply, including information about
 * either: 1) the target inode and/or its parent directory and dentry,
 * and directory contents (for readdir results), or
 * 2) the file range lock info (for fcntl F_GETLK results).
 */
struct ceph_mds_reply_info_parsed {
	struct ceph_mds_reply_head    *head;

	/* trace */
	struct ceph_mds_reply_info_in diri, targeti;
	struct ceph_mds_reply_dirfrag *dirfrag;
	char                          *dname;
	u32                           dname_len;
	struct ceph_mds_reply_lease   *dlease;

	/* extra */
	union {
		/* for fcntl F_GETLK results */
		struct ceph_filelock *filelock_reply;

		/* for readdir results */
		struct {
			struct ceph_mds_reply_dirfrag *dir_dir;
			size_t			      dir_buf_size;
			int                           dir_nr;
			bool			      dir_end;
			bool			      dir_complete;
			bool			      hash_order;
			bool			      offset_hash;
			struct ceph_mds_reply_dir_entry  *dir_entries;
		};

		/* for create results */
		struct {
			bool has_create_ino;
			u64 ino;
		};
	};

	/* encoded blob describing snapshot contexts for certain
	   operations (e.g., open) */
	void *snapblob;
	int snapblob_len;
};


/*
 * cap releases are batched and sent to the MDS en masse.
 *
 * Account for per-message overhead of mds_cap_release header
 * and __le32 for osd epoch barrier trailing field.
 */
#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) -		\
				sizeof(struct ceph_mds_cap_release)) /	\
			        sizeof(struct ceph_mds_cap_item))


/*
 * state associated with each MDS<->client session
 */
enum {
	CEPH_MDS_SESSION_NEW = 1,
	CEPH_MDS_SESSION_OPENING = 2,
	CEPH_MDS_SESSION_OPEN = 3,
	CEPH_MDS_SESSION_HUNG = 4,
	CEPH_MDS_SESSION_CLOSING = 5,
	CEPH_MDS_SESSION_RESTARTING = 6,
	CEPH_MDS_SESSION_RECONNECTING = 7,
	CEPH_MDS_SESSION_REJECTED = 8,
};

struct ceph_mds_session {
	struct ceph_mds_client *s_mdsc;
	int               s_mds;
	int               s_state;
	unsigned long     s_ttl;      /* time until mds kills us */
	u64               s_seq;      /* incoming msg seq # */
	struct mutex      s_mutex;    /* serialize session messages */

	struct ceph_connection s_con;

	struct ceph_auth_handshake s_auth;

	/* protected by s_gen_ttl_lock */
	spinlock_t        s_gen_ttl_lock;
	u32               s_cap_gen;  /* inc each time we get mds stale msg */
	unsigned long     s_cap_ttl;  /* when session caps expire */

	/* protected by s_cap_lock */
	spinlock_t        s_cap_lock;
	struct list_head  s_caps;     /* all caps issued by this session */
	int               s_nr_caps, s_trim_caps;
	int               s_num_cap_releases;
	int		  s_cap_reconnect;
	int		  s_readonly;
	struct list_head  s_cap_releases; /* waiting cap_release messages */
	struct ceph_cap  *s_cap_iterator;

	/* protected by mutex */
	struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
	unsigned long     s_renew_requested; /* last time we sent a renew req */
	u64               s_renew_seq;

	refcount_t          s_ref;
	struct list_head  s_waiting;  /* waiting requests */
	struct list_head  s_unsafe;   /* unsafe requests */
};

/*
 * modes of choosing which MDS to send a request to
 */
enum {
	USE_ANY_MDS,
	USE_RANDOM_MDS,
	USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
};

struct ceph_mds_request;
struct ceph_mds_client;

/*
 * request completion callback
 */
typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
					     struct ceph_mds_request *req);
/*
 * wait for request completion callback
 */
typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
						 struct ceph_mds_request *req);

/*
 * an in-flight mds request
 */
struct ceph_mds_request {
	u64 r_tid;                   /* transaction id */
	struct rb_node r_node;
	struct ceph_mds_client *r_mdsc;

	int r_op;                    /* mds op code */

	/* operation on what? */
	struct inode *r_inode;              /* arg1 */
	struct dentry *r_dentry;            /* arg1 */
	struct dentry *r_old_dentry;        /* arg2: rename from or link from */
	struct inode *r_old_dentry_dir;     /* arg2: old dentry's parent dir */
	char *r_path1, *r_path2;
	struct ceph_vino r_ino1, r_ino2;

	struct inode *r_parent;		    /* parent dir inode */
	struct inode *r_target_inode;       /* resulting inode */

#define CEPH_MDS_R_DIRECT_IS_HASH	(1) /* r_direct_hash is valid */
#define CEPH_MDS_R_ABORTED		(2) /* call was aborted */
#define CEPH_MDS_R_GOT_UNSAFE		(3) /* got an unsafe reply */
#define CEPH_MDS_R_GOT_SAFE		(4) /* got a safe reply */
#define CEPH_MDS_R_GOT_RESULT		(5) /* got a result */
#define CEPH_MDS_R_DID_PREPOPULATE	(6) /* prepopulated readdir */
#define CEPH_MDS_R_PARENT_LOCKED	(7) /* is r_parent->i_rwsem wlocked? */
	unsigned long	r_req_flags;

	struct mutex r_fill_mutex;

	union ceph_mds_request_args r_args;
	int r_fmode;        /* file mode, if expecting cap */
	kuid_t r_uid;
	kgid_t r_gid;
	struct timespec64 r_stamp;

	/* for choosing which mds to send this request to */
	int r_direct_mode;
	u32 r_direct_hash;      /* choose dir frag based on this dentry hash */

	/* data payload is used for xattr ops */
	struct ceph_pagelist *r_pagelist;

	/* what caps shall we drop? */
	int r_inode_drop, r_inode_unless;
	int r_dentry_drop, r_dentry_unless;
	int r_old_dentry_drop, r_old_dentry_unless;
	struct inode *r_old_inode;
	int r_old_inode_drop, r_old_inode_unless;

	struct ceph_msg  *r_request;  /* original request */
	int r_request_release_offset;
	struct ceph_msg  *r_reply;
	struct ceph_mds_reply_info_parsed r_reply_info;
	struct page *r_locked_page;
	int r_err;

	unsigned long r_timeout;  /* optional.  jiffies, 0 is "wait forever" */
	unsigned long r_started;  /* start time to measure timeout against */
	unsigned long r_request_started; /* start time for mds request only,
					    used to measure lease durations */

	/* link unsafe requests to parent directory, for fsync */
	struct inode	*r_unsafe_dir;
	struct list_head r_unsafe_dir_item;

	/* unsafe requests that modify the target inode */
	struct list_head r_unsafe_target_item;

	struct ceph_mds_session *r_session;

	int               r_attempts;   /* resend attempts */
	int               r_num_fwd;    /* number of forward attempts */
	int               r_resend_mds; /* mds to resend to next, if any*/
	u32               r_sent_on_mseq; /* cap mseq request was sent at*/

	struct kref       r_kref;
	struct list_head  r_wait;
	struct completion r_completion;
	struct completion r_safe_completion;
	ceph_mds_request_callback_t r_callback;
	ceph_mds_request_wait_callback_t r_wait_for_completion;
	struct list_head  r_unsafe_item;  /* per-session unsafe list item */

	long long	  r_dir_release_cnt;
	long long	  r_dir_ordered_cnt;
	int		  r_readdir_cache_idx;
	u32               r_readdir_offset;

	struct ceph_cap_reservation r_caps_reservation;
	int r_num_caps;
};

struct ceph_pool_perm {
	struct rb_node node;
	int perm;
	s64 pool;
	size_t pool_ns_len;
	char pool_ns[];
};

/*
 * mds client state
 */
struct ceph_mds_client {
	struct ceph_fs_client  *fsc;
	struct mutex            mutex;         /* all nested structures */

	struct ceph_mdsmap      *mdsmap;
	struct completion       safe_umount_waiters;
	wait_queue_head_t       session_close_wq;
	struct list_head        waiting_for_map;
	int 			mdsmap_err;

	struct ceph_mds_session **sessions;    /* NULL for mds if no session */
	atomic_t		num_sessions;
	int                     max_sessions;  /* len of s_mds_sessions */
	int                     stopping;      /* true if shutting down */

	atomic64_t		quotarealms_count; /* # realms with quota */

	/*
	 * snap_rwsem will cover cap linkage into snaprealms, and
	 * realm snap contexts.  (later, we can do per-realm snap
	 * contexts locks..)  the empty list contains realms with no
	 * references (implying they contain no inodes with caps) that
	 * should be destroyed.
	 */
	u64			last_snap_seq;
	struct rw_semaphore     snap_rwsem;
	struct rb_root          snap_realms;
	struct list_head        snap_empty;
	spinlock_t              snap_empty_lock;  /* protect snap_empty */

	u64                    last_tid;      /* most recent mds request */
	u64                    oldest_tid;    /* oldest incomplete mds request,
						 excluding setfilelock requests */
	struct rb_root         request_tree;  /* pending mds requests */
	struct delayed_work    delayed_work;  /* delayed work */
	unsigned long    last_renew_caps;  /* last time we renewed our caps */
	struct list_head cap_delay_list;   /* caps with delayed release */
	spinlock_t       cap_delay_lock;   /* protects cap_delay_list */
	struct list_head snap_flush_list;  /* cap_snaps ready to flush */
	spinlock_t       snap_flush_lock;

	u64               last_cap_flush_tid;
	struct list_head  cap_flush_list;
	struct list_head  cap_dirty;        /* inodes with dirty caps */
	struct list_head  cap_dirty_migrating; /* ...that are migration... */
	int               num_cap_flushing; /* # caps we are flushing */
	spinlock_t        cap_dirty_lock;   /* protects above items */
	wait_queue_head_t cap_flushing_wq;

	/*
	 * Cap reservations
	 *
	 * Maintain a global pool of preallocated struct ceph_caps, referenced
	 * by struct ceph_caps_reservations.  This ensures that we preallocate
	 * memory needed to successfully process an MDS response.  (If an MDS
	 * sends us cap information and we fail to process it, we will have
	 * problems due to the client and MDS being out of sync.)
	 *
	 * Reservations are 'owned' by a ceph_cap_reservation context.
	 */
	spinlock_t	caps_list_lock;
	struct		list_head caps_list; /* unused (reserved or
						unreserved) */
	int		caps_total_count;    /* total caps allocated */
	int		caps_use_count;      /* in use */
	int		caps_reserve_count;  /* unused, reserved */
	int		caps_avail_count;    /* unused, unreserved */
	int		caps_min_count;      /* keep at least this many
						(unreserved) */
	spinlock_t	  dentry_lru_lock;
	struct list_head  dentry_lru;
	int		  num_dentry;

	struct rw_semaphore     pool_perm_rwsem;
	struct rb_root		pool_perm_tree;

	char nodename[__NEW_UTS_LEN + 1];
};

extern const char *ceph_mds_op_name(int op);

extern struct ceph_mds_session *
__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);

static inline struct ceph_mds_session *
ceph_get_mds_session(struct ceph_mds_session *s)
{
	refcount_inc(&s->s_ref);
	return s;
}

extern const char *ceph_session_state_name(int s);

extern void ceph_put_mds_session(struct ceph_mds_session *s);

extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
			     struct ceph_msg *msg, int mds);

extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);

extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);

extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
					   struct inode *dir);
extern struct ceph_mds_request *
ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
				     struct ceph_mds_request *req);
extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
				struct inode *dir,
				struct ceph_mds_request *req);
static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
{
	kref_get(&req->r_kref);
}
extern void ceph_mdsc_release_request(struct kref *kref);
static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
{
	kref_put(&req->r_kref, ceph_mdsc_release_request);
}

extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
				   struct ceph_mds_session *session);

extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);

extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
				  int stop_on_nosnap);

extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
				     struct inode *inode,
				     struct dentry *dentry, char action,
				     u32 seq);

extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
				    struct ceph_msg *msg);
extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
				   struct ceph_msg *msg);

extern struct ceph_mds_session *
ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
					  struct ceph_mds_session *session);

extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
			  struct ceph_mds_session *session,
			  int max_caps);
#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
2f2dc053 SW	2	#ifndef _FS_CEPH_MDS_CLIENT_H
	3	#define _FS_CEPH_MDS_CLIENT_H
	4
	5	#include <linux/completion.h>
153c8e6b	6	#include <linux/kref.h>
2f2dc053 SW	7	#include <linux/list.h>
2f2dc053 SW	8	#include <linux/mutex.h>
44ca18f2	9	#include <linux/rbtree.h>
2f2dc053	10	#include <linux/spinlock.h>
3997c01d	11	#include <linux/refcount.h>
717e6f28	12	#include <linux/utsname.h>
2f2dc053	13
3d14c5d2 YS	14	#include <linux/ceph/types.h>
	15	#include <linux/ceph/messenger.h>
	16	#include <linux/ceph/mdsmap.h>
6c4a1915	17	#include <linux/ceph/auth.h>
2f2dc053	18
342ce182	19	/* The first 8 bits are reserved for old ceph releases */
d2f8bb27 YZ	20	#define CEPHFS_FEATURE_MIMIC 8
	21	#define CEPHFS_FEATURE_REPLY_ENCODING 9
	22	#define CEPHFS_FEATURE_RECLAIM_CLIENT 10
	23	#define CEPHFS_FEATURE_LAZY_CAP_WANTED 11
	24
	25	#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
	26	0, 1, 2, 3, 4, 5, 6, 7, \
	27	CEPHFS_FEATURE_MIMIC, \
	28	CEPHFS_FEATURE_LAZY_CAP_WANTED, \
342ce182	29	}
342ce182 YZ	30	#define CEPHFS_FEATURES_CLIENT_REQUIRED {}
	31
	32
2f2dc053 SW	33	/*
	34	* Some lock dependencies:
	35	*
	36	* session->s_mutex
	37	* mdsc->mutex
	38	*
	39	* mdsc->snap_rwsem
	40	*
be655596	41	* ci->i_ceph_lock
2f2dc053 SW	42	* mdsc->snap_flush_lock
	43	* mdsc->cap_delay_lock
	44	*
	45	*/
	46
3d14c5d2	47	struct ceph_fs_client;
2f2dc053 SW	48	struct ceph_cap;
	49
	50	/*
	51	* parsed info about a single inode. pointers are into the encoded
	52	* on-wire structures within the mds reply message payload.
	53	*/
	54	struct ceph_mds_reply_info_in {
	55	struct ceph_mds_reply_inode *in;
14303d20	56	struct ceph_dir_layout dir_layout;
2f2dc053 SW	57	u32 symlink_len;
	58	char *symlink;
	59	u32 xattr_len;
	60	char *xattr_data;
fb01d1f8 YZ	61	u64 inline_version;
	62	u32 inline_len;
	63	char *inline_data;
5ea5c5e0	64	u32 pool_ns_len;
779fe0fb	65	char *pool_ns_data;
fb18a575 LH	66	u64 max_bytes;
fb18a575 LH	67	u64 max_files;
2f2dc053 SW	68	};
2f2dc053 SW	69
2a5beea3 YZ	70	struct ceph_mds_reply_dir_entry {
	71	char *name;
	72	u32 name_len;
	73	struct ceph_mds_reply_lease *lease;
	74	struct ceph_mds_reply_info_in inode;
8974eebd	75	loff_t offset;
2a5beea3 YZ	76	};
2a5beea3 YZ	77
2f2dc053	78	/*
25933abd HS	79	* parsed info about an mds reply, including information about
	80	* either: 1) the target inode and/or its parent directory and dentry,
	81	* and directory contents (for readdir results), or
	82	* 2) the file range lock info (for fcntl F_GETLK results).
2f2dc053 SW	83	*/
	84	struct ceph_mds_reply_info_parsed {
	85	struct ceph_mds_reply_head *head;
	86
25933abd	87	/* trace */
2f2dc053 SW	88	struct ceph_mds_reply_info_in diri, targeti;
	89	struct ceph_mds_reply_dirfrag *dirfrag;
	90	char *dname;
	91	u32 dname_len;
	92	struct ceph_mds_reply_lease *dlease;
	93
25933abd HS	94	/* extra */
	95	union {
	96	/* for fcntl F_GETLK results */
	97	struct ceph_filelock *filelock_reply;
	98
	99	/* for readdir results */
	100	struct {
	101	struct ceph_mds_reply_dirfrag *dir_dir;
54008399	102	size_t dir_buf_size;
25933abd	103	int dir_nr;
f3c4ebe6	104	bool dir_end;
79162547	105	bool dir_complete;
f3c4ebe6	106	bool hash_order;
79162547	107	bool offset_hash;
2a5beea3	108	struct ceph_mds_reply_dir_entry *dir_entries;
25933abd	109	};
6e8575fa SL	110
	111	/* for create results */
	112	struct {
	113	bool has_create_ino;
	114	u64 ino;
	115	};
25933abd	116	};
2f2dc053 SW	117
	118	/* encoded blob describing snapshot contexts for certain
	119	operations (e.g., open) */
	120	void *snapblob;
	121	int snapblob_len;
	122	};
	123
	124
	125	/*
	126	* cap releases are batched and sent to the MDS en masse.
92475f05 JL	127	*
	128	* Account for per-message overhead of mds_cap_release header
	129	* and __le32 for osd epoch barrier trailing field.
2f2dc053	130	*/
92475f05	131	#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
2f2dc053	132	sizeof(struct ceph_mds_cap_release)) / \
92475f05	133	sizeof(struct ceph_mds_cap_item))
2f2dc053 SW	134
	135
	136	/*
	137	* state associated with each MDS<->client session
	138	*/
	139	enum {
	140	CEPH_MDS_SESSION_NEW = 1,
	141	CEPH_MDS_SESSION_OPENING = 2,
	142	CEPH_MDS_SESSION_OPEN = 3,
	143	CEPH_MDS_SESSION_HUNG = 4,
	144	CEPH_MDS_SESSION_CLOSING = 5,
	145	CEPH_MDS_SESSION_RESTARTING = 6,
	146	CEPH_MDS_SESSION_RECONNECTING = 7,
fcff415c	147	CEPH_MDS_SESSION_REJECTED = 8,
2f2dc053 SW	148	};
	149
	150	struct ceph_mds_session {
	151	struct ceph_mds_client *s_mdsc;
	152	int s_mds;
	153	int s_state;
	154	unsigned long s_ttl; /* time until mds kills us */
	155	u64 s_seq; /* incoming msg seq # */
	156	struct mutex s_mutex; /* serialize session messages */
	157
	158	struct ceph_connection s_con;
	159
6c4a1915	160	struct ceph_auth_handshake s_auth;
4e7a5dcd	161
d8fb02ab AE	162	/* protected by s_gen_ttl_lock */
d8fb02ab AE	163	spinlock_t s_gen_ttl_lock;
2f2dc053 SW	164	u32 s_cap_gen; /* inc each time we get mds stale msg */
2f2dc053 SW	165	unsigned long s_cap_ttl; /* when session caps expire */
d8fb02ab AE	166
	167	/* protected by s_cap_lock */
	168	spinlock_t s_cap_lock;
2f2dc053 SW	169	struct list_head s_caps; /* all caps issued by this session */
	170	int s_nr_caps, s_trim_caps;
	171	int s_num_cap_releases;
99a9c273	172	int s_cap_reconnect;
03f4fcb0	173	int s_readonly;
2f2dc053	174	struct list_head s_cap_releases; /* waiting cap_release messages */
7c1332b8	175	struct ceph_cap *s_cap_iterator;
2f2dc053 SW	176
	177	/* protected by mutex */
	178	struct list_head s_cap_flushing; /* inodes w/ flushing caps */
2f2dc053 SW	179	unsigned long s_renew_requested; /* last time we sent a renew req */
	180	u64 s_renew_seq;
	181
3997c01d	182	refcount_t s_ref;
2f2dc053 SW	183	struct list_head s_waiting; /* waiting requests */
	184	struct list_head s_unsafe; /* unsafe requests */
	185	};
	186
	187	/*
	188	* modes of choosing which MDS to send a request to
	189	*/
	190	enum {
	191	USE_ANY_MDS,
	192	USE_RANDOM_MDS,
	193	USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
	194	};
	195
	196	struct ceph_mds_request;
	197	struct ceph_mds_client;
	198
	199	/*
	200	* request completion callback
	201	*/
	202	typedef void (ceph_mds_request_callback_t) (struct ceph_mds_client mdsc,
	203	struct ceph_mds_request *req);
9280be24 YZ	204	/*
	205	* wait for request completion callback
	206	*/
	207	typedef int (ceph_mds_request_wait_callback_t) (struct ceph_mds_client mdsc,
	208	struct ceph_mds_request *req);
2f2dc053 SW	209
	210	/*
	211	* an in-flight mds request
	212	*/
	213	struct ceph_mds_request {
	214	u64 r_tid; /* transaction id */
44ca18f2	215	struct rb_node r_node;
37151668	216	struct ceph_mds_client *r_mdsc;
2f2dc053 SW	217
2f2dc053 SW	218	int r_op; /* mds op code */
2f2dc053 SW	219
	220	/* operation on what? */
	221	struct inode r_inode; / arg1 */
	222	struct dentry r_dentry; / arg1 */
	223	struct dentry r_old_dentry; / arg2: rename from or link from */
41b02e1f	224	struct inode r_old_dentry_dir; / arg2: old dentry's parent dir */
2f2dc053 SW	225	char r_path1, r_path2;
	226	struct ceph_vino r_ino1, r_ino2;
	227
3dd69aab	228	struct inode r_parent; / parent dir inode */
2f2dc053 SW	229	struct inode r_target_inode; / resulting inode */
2f2dc053 SW	230
bc2de10d JL	231	#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
	232	#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
	233	#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
	234	#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
	235	#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
	236	#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
3dd69aab	237	#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
bc2de10d JL	238	unsigned long r_req_flags;
bc2de10d JL	239
b4556396 SW	240	struct mutex r_fill_mutex;
b4556396 SW	241
2f2dc053 SW	242	union ceph_mds_request_args r_args;
2f2dc053 SW	243	int r_fmode; /* file mode, if expecting cap */
ff3d0046 EB	244	kuid_t r_uid;
ff3d0046 EB	245	kgid_t r_gid;
0ed1e90a	246	struct timespec64 r_stamp;
2f2dc053 SW	247
	248	/* for choosing which mds to send this request to */
	249	int r_direct_mode;
	250	u32 r_direct_hash; /* choose dir frag based on this dentry hash */
2f2dc053 SW	251
2f2dc053 SW	252	/* data payload is used for xattr ops */
25e6bae3	253	struct ceph_pagelist *r_pagelist;
2f2dc053 SW	254
	255	/* what caps shall we drop? */
	256	int r_inode_drop, r_inode_unless;
	257	int r_dentry_drop, r_dentry_unless;
	258	int r_old_dentry_drop, r_old_dentry_unless;
	259	struct inode *r_old_inode;
	260	int r_old_inode_drop, r_old_inode_unless;
	261
	262	struct ceph_msg r_request; / original request */
e979cf50	263	int r_request_release_offset;
2f2dc053 SW	264	struct ceph_msg *r_reply;
2f2dc053 SW	265	struct ceph_mds_reply_info_parsed r_reply_info;
01deead0	266	struct page *r_locked_page;
2f2dc053 SW	267	int r_err;
2f2dc053 SW	268
a319bf56	269	unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
2f2dc053 SW	270	unsigned long r_started; /* start time to measure timeout against */
	271	unsigned long r_request_started; /* start time for mds request only,
	272	used to measure lease durations */
	273
	274	/* link unsafe requests to parent directory, for fsync */
	275	struct inode *r_unsafe_dir;
	276	struct list_head r_unsafe_dir_item;
	277
68cd5b4b YZ	278	/* unsafe requests that modify the target inode */
	279	struct list_head r_unsafe_target_item;
	280
2f2dc053 SW	281	struct ceph_mds_session *r_session;
	282
	283	int r_attempts; /* resend attempts */
	284	int r_num_fwd; /* number of forward attempts */
2f2dc053	285	int r_resend_mds; /* mds to resend to next, if any*/
e55b71f8	286	u32 r_sent_on_mseq; /* cap mseq request was sent at*/
2f2dc053	287
153c8e6b	288	struct kref r_kref;
2f2dc053 SW	289	struct list_head r_wait;
	290	struct completion r_completion;
	291	struct completion r_safe_completion;
	292	ceph_mds_request_callback_t r_callback;
9280be24	293	ceph_mds_request_wait_callback_t r_wait_for_completion;
2f2dc053	294	struct list_head r_unsafe_item; /* per-session unsafe list item */
2f2dc053	295
fdd4e158 YZ	296	long long r_dir_release_cnt;
	297	long long r_dir_ordered_cnt;
	298	int r_readdir_cache_idx;
2f2dc053 SW	299	u32 r_readdir_offset;
	300
	301	struct ceph_cap_reservation r_caps_reservation;
	302	int r_num_caps;
	303	};
	304
10183a69 YZ	305	struct ceph_pool_perm {
10183a69 YZ	306	struct rb_node node;
10183a69	307	int perm;
7627151e	308	s64 pool;
779fe0fb YZ	309	size_t pool_ns_len;
779fe0fb YZ	310	char pool_ns[];
10183a69 YZ	311	};
10183a69 YZ	312
2f2dc053 SW	313	/*
	314	* mds client state
	315	*/
	316	struct ceph_mds_client {
3d14c5d2	317	struct ceph_fs_client *fsc;
2f2dc053 SW	318	struct mutex mutex; /* all nested structures */
	319
	320	struct ceph_mdsmap *mdsmap;
f3c60c59 SW	321	struct completion safe_umount_waiters;
f3c60c59 SW	322	wait_queue_head_t session_close_wq;
2f2dc053	323	struct list_head waiting_for_map;
430afbad	324	int mdsmap_err;
2f2dc053 SW	325
2f2dc053 SW	326	struct ceph_mds_session *sessions; / NULL for mds if no session */
86d8f67b	327	atomic_t num_sessions;
2f2dc053 SW	328	int max_sessions; /* len of s_mds_sessions */
	329	int stopping; /* true if shutting down */
	330
d557c48d LH	331	atomic64_t quotarealms_count; /* # realms with quota */
d557c48d LH	332
2f2dc053 SW	333	/*
	334	* snap_rwsem will cover cap linkage into snaprealms, and
	335	* realm snap contexts. (later, we can do per-realm snap
	336	* contexts locks..) the empty list contains realms with no
	337	* references (implying they contain no inodes with caps) that
	338	* should be destroyed.
	339	*/
affbc19a	340	u64 last_snap_seq;
2f2dc053	341	struct rw_semaphore snap_rwsem;
a105f00c	342	struct rb_root snap_realms;
2f2dc053 SW	343	struct list_head snap_empty;
	344	spinlock_t snap_empty_lock; /* protect snap_empty */
	345
	346	u64 last_tid; /* most recent mds request */
e8a7b8b1 YZ	347	u64 oldest_tid; /* oldest incomplete mds request,
e8a7b8b1 YZ	348	excluding setfilelock requests */
44ca18f2	349	struct rb_root request_tree; /* pending mds requests */
2f2dc053 SW	350	struct delayed_work delayed_work; /* delayed work */
	351	unsigned long last_renew_caps; /* last time we renewed our caps */
	352	struct list_head cap_delay_list; /* caps with delayed release */
	353	spinlock_t cap_delay_lock; /* protects cap_delay_list */
	354	struct list_head snap_flush_list; /* cap_snaps ready to flush */
	355	spinlock_t snap_flush_lock;
	356
553adfd9	357	u64 last_cap_flush_tid;
e4500b5e	358	struct list_head cap_flush_list;
2f2dc053	359	struct list_head cap_dirty; /* inodes with dirty caps */
db354052	360	struct list_head cap_dirty_migrating; /* ...that are migration... */
2f2dc053 SW	361	int num_cap_flushing; /* # caps we are flushing */
	362	spinlock_t cap_dirty_lock; /* protects above items */
	363	wait_queue_head_t cap_flushing_wq;
	364
37151668 YS	365	/*
	366	* Cap reservations
	367	*
	368	* Maintain a global pool of preallocated struct ceph_caps, referenced
	369	* by struct ceph_caps_reservations. This ensures that we preallocate
	370	* memory needed to successfully process an MDS response. (If an MDS
	371	* sends us cap information and we fail to process it, we will have
	372	* problems due to the client and MDS being out of sync.)
	373	*
	374	* Reservations are 'owned' by a ceph_cap_reservation context.
	375	*/
	376	spinlock_t caps_list_lock;
	377	struct list_head caps_list; /* unused (reserved or
	378	unreserved) */
	379	int caps_total_count; /* total caps allocated */
	380	int caps_use_count; /* in use */
	381	int caps_reserve_count; /* unused, reserved */
	382	int caps_avail_count; /* unused, unreserved */
	383	int caps_min_count; /* keep at least this many
	384	(unreserved) */
2f2dc053 SW	385	spinlock_t dentry_lru_lock;
	386	struct list_head dentry_lru;
	387	int num_dentry;
10183a69 YZ	388
	389	struct rw_semaphore pool_perm_rwsem;
	390	struct rb_root pool_perm_tree;
717e6f28 YZ	391
717e6f28 YZ	392	char nodename[__NEW_UTS_LEN + 1];
2f2dc053 SW	393	};
	394
	395	extern const char *ceph_mds_op_name(int op);
	396
	397	extern struct ceph_mds_session *
	398	__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
	399
	400	static inline struct ceph_mds_session *
	401	ceph_get_mds_session(struct ceph_mds_session *s)
	402	{
3997c01d	403	refcount_inc(&s->s_ref);
2f2dc053 SW	404	return s;
	405	}
	406
a687ecaf JS	407	extern const char *ceph_session_state_name(int s);
a687ecaf JS	408
2f2dc053 SW	409	extern void ceph_put_mds_session(struct ceph_mds_session *s);
	410
	411	extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
	412	struct ceph_msg *msg, int mds);
	413
3d14c5d2	414	extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
2f2dc053	415	extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
48fec5d0	416	extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
3d14c5d2	417	extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
2f2dc053 SW	418
	419	extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
	420
167c9e35	421	extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
54008399 YZ	422	extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
54008399 YZ	423	struct inode *dir);
2f2dc053 SW	424	extern struct ceph_mds_request *
	425	ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
	426	extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
	427	struct ceph_mds_request *req);
	428	extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
	429	struct inode *dir,
	430	struct ceph_mds_request *req);
	431	static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
	432	{
153c8e6b SW	433	kref_get(&req->r_kref);
	434	}
	435	extern void ceph_mdsc_release_request(struct kref *kref);
	436	static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
	437	{
	438	kref_put(&req->r_kref, ceph_mdsc_release_request);
2f2dc053	439	}
2f2dc053	440
3d7ded4d SW	441	extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
	442	struct ceph_mds_session *session);
	443
2f2dc053 SW	444	extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
	445
	446	extern char ceph_mdsc_build_path(struct dentry dentry, int plen, u64 base,
	447	int stop_on_nosnap);
	448
	449	extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
	450	extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
	451	struct inode *inode,
	452	struct dentry *dentry, char action,
	453	u32 seq);
	454
430afbad YZ	455	extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
	456	struct ceph_msg *msg);
	457	extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
	458	struct ceph_msg *msg);
2f2dc053	459
5d72d13c YZ	460	extern struct ceph_mds_session *
5d72d13c YZ	461	ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
154f42c2 SW	462	extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
	463	struct ceph_mds_session *session);
	464
e30ee581 ZZ	465	extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
	466	struct ceph_mds_session *session,
	467	int max_caps);
2f2dc053	468	#endif