[mirror_ubuntu-bionic-kernel.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>

/*
 * 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 */
	struct ceph_cap  *s_cap_iterator;
	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 work_struct s_cap_release_work;

	/* 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 timespec 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_queue_cap_release(struct ceph_mds_session *session,
				    struct ceph_cap *cap);
extern void ceph_flush_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);

#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 SW	18
	19	/*
	20	* Some lock dependencies:
	21	*
	22	* session->s_mutex
	23	* mdsc->mutex
	24	*
	25	* mdsc->snap_rwsem
	26	*
be655596	27	* ci->i_ceph_lock
2f2dc053 SW	28	* mdsc->snap_flush_lock
	29	* mdsc->cap_delay_lock
	30	*
	31	*/
	32
3d14c5d2	33	struct ceph_fs_client;
2f2dc053 SW	34	struct ceph_cap;
	35
	36	/*
	37	* parsed info about a single inode. pointers are into the encoded
	38	* on-wire structures within the mds reply message payload.
	39	*/
	40	struct ceph_mds_reply_info_in {
	41	struct ceph_mds_reply_inode *in;
14303d20	42	struct ceph_dir_layout dir_layout;
2f2dc053 SW	43	u32 symlink_len;
	44	char *symlink;
	45	u32 xattr_len;
	46	char *xattr_data;
fb01d1f8 YZ	47	u64 inline_version;
	48	u32 inline_len;
	49	char *inline_data;
5ea5c5e0	50	u32 pool_ns_len;
779fe0fb	51	char *pool_ns_data;
7370e8a4 LH	52	u64 max_bytes;
7370e8a4 LH	53	u64 max_files;
2f2dc053 SW	54	};
2f2dc053 SW	55
2a5beea3 YZ	56	struct ceph_mds_reply_dir_entry {
	57	char *name;
	58	u32 name_len;
	59	struct ceph_mds_reply_lease *lease;
	60	struct ceph_mds_reply_info_in inode;
8974eebd	61	loff_t offset;
2a5beea3 YZ	62	};
2a5beea3 YZ	63
2f2dc053	64	/*
25933abd HS	65	* parsed info about an mds reply, including information about
	66	* either: 1) the target inode and/or its parent directory and dentry,
	67	* and directory contents (for readdir results), or
	68	* 2) the file range lock info (for fcntl F_GETLK results).
2f2dc053 SW	69	*/
	70	struct ceph_mds_reply_info_parsed {
	71	struct ceph_mds_reply_head *head;
	72
25933abd	73	/* trace */
2f2dc053 SW	74	struct ceph_mds_reply_info_in diri, targeti;
	75	struct ceph_mds_reply_dirfrag *dirfrag;
	76	char *dname;
	77	u32 dname_len;
	78	struct ceph_mds_reply_lease *dlease;
	79
25933abd HS	80	/* extra */
	81	union {
	82	/* for fcntl F_GETLK results */
	83	struct ceph_filelock *filelock_reply;
	84
	85	/* for readdir results */
	86	struct {
	87	struct ceph_mds_reply_dirfrag *dir_dir;
54008399	88	size_t dir_buf_size;
25933abd	89	int dir_nr;
f3c4ebe6	90	bool dir_end;
79162547	91	bool dir_complete;
f3c4ebe6	92	bool hash_order;
79162547	93	bool offset_hash;
2a5beea3	94	struct ceph_mds_reply_dir_entry *dir_entries;
25933abd	95	};
6e8575fa SL	96
	97	/* for create results */
	98	struct {
	99	bool has_create_ino;
	100	u64 ino;
	101	};
25933abd	102	};
2f2dc053 SW	103
	104	/* encoded blob describing snapshot contexts for certain
	105	operations (e.g., open) */
	106	void *snapblob;
	107	int snapblob_len;
	108	};
	109
	110
	111	/*
	112	* cap releases are batched and sent to the MDS en masse.
92475f05 JL	113	*
	114	* Account for per-message overhead of mds_cap_release header
	115	* and __le32 for osd epoch barrier trailing field.
2f2dc053	116	*/
92475f05	117	#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
2f2dc053	118	sizeof(struct ceph_mds_cap_release)) / \
92475f05	119	sizeof(struct ceph_mds_cap_item))
2f2dc053 SW	120
	121
	122	/*
	123	* state associated with each MDS<->client session
	124	*/
	125	enum {
	126	CEPH_MDS_SESSION_NEW = 1,
	127	CEPH_MDS_SESSION_OPENING = 2,
	128	CEPH_MDS_SESSION_OPEN = 3,
	129	CEPH_MDS_SESSION_HUNG = 4,
	130	CEPH_MDS_SESSION_CLOSING = 5,
	131	CEPH_MDS_SESSION_RESTARTING = 6,
	132	CEPH_MDS_SESSION_RECONNECTING = 7,
fcff415c	133	CEPH_MDS_SESSION_REJECTED = 8,
2f2dc053 SW	134	};
	135
	136	struct ceph_mds_session {
	137	struct ceph_mds_client *s_mdsc;
	138	int s_mds;
	139	int s_state;
	140	unsigned long s_ttl; /* time until mds kills us */
	141	u64 s_seq; /* incoming msg seq # */
	142	struct mutex s_mutex; /* serialize session messages */
	143
	144	struct ceph_connection s_con;
	145
6c4a1915	146	struct ceph_auth_handshake s_auth;
4e7a5dcd	147
d8fb02ab AE	148	/* protected by s_gen_ttl_lock */
d8fb02ab AE	149	spinlock_t s_gen_ttl_lock;
2f2dc053 SW	150	u32 s_cap_gen; /* inc each time we get mds stale msg */
2f2dc053 SW	151	unsigned long s_cap_ttl; /* when session caps expire */
d8fb02ab AE	152
	153	/* protected by s_cap_lock */
	154	spinlock_t s_cap_lock;
2f2dc053	155	struct list_head s_caps; /* all caps issued by this session */
1de82206	156	struct ceph_cap *s_cap_iterator;
2f2dc053 SW	157	int s_nr_caps, s_trim_caps;
2f2dc053 SW	158	int s_num_cap_releases;
99a9c273	159	int s_cap_reconnect;
03f4fcb0	160	int s_readonly;
2f2dc053	161	struct list_head s_cap_releases; /* waiting cap_release messages */
1de82206	162	struct work_struct s_cap_release_work;
2f2dc053 SW	163
	164	/* protected by mutex */
	165	struct list_head s_cap_flushing; /* inodes w/ flushing caps */
2f2dc053 SW	166	unsigned long s_renew_requested; /* last time we sent a renew req */
	167	u64 s_renew_seq;
	168
3997c01d	169	refcount_t s_ref;
2f2dc053 SW	170	struct list_head s_waiting; /* waiting requests */
	171	struct list_head s_unsafe; /* unsafe requests */
	172	};
	173
	174	/*
	175	* modes of choosing which MDS to send a request to
	176	*/
	177	enum {
	178	USE_ANY_MDS,
	179	USE_RANDOM_MDS,
	180	USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
	181	};
	182
	183	struct ceph_mds_request;
	184	struct ceph_mds_client;
	185
	186	/*
	187	* request completion callback
	188	*/
	189	typedef void (ceph_mds_request_callback_t) (struct ceph_mds_client mdsc,
	190	struct ceph_mds_request *req);
9280be24 YZ	191	/*
	192	* wait for request completion callback
	193	*/
	194	typedef int (ceph_mds_request_wait_callback_t) (struct ceph_mds_client mdsc,
	195	struct ceph_mds_request *req);
2f2dc053 SW	196
	197	/*
	198	* an in-flight mds request
	199	*/
	200	struct ceph_mds_request {
	201	u64 r_tid; /* transaction id */
44ca18f2	202	struct rb_node r_node;
37151668	203	struct ceph_mds_client *r_mdsc;
2f2dc053 SW	204
2f2dc053 SW	205	int r_op; /* mds op code */
2f2dc053 SW	206
	207	/* operation on what? */
	208	struct inode r_inode; / arg1 */
	209	struct dentry r_dentry; / arg1 */
	210	struct dentry r_old_dentry; / arg2: rename from or link from */
41b02e1f	211	struct inode r_old_dentry_dir; / arg2: old dentry's parent dir */
2f2dc053 SW	212	char r_path1, r_path2;
	213	struct ceph_vino r_ino1, r_ino2;
	214
3dd69aab	215	struct inode r_parent; / parent dir inode */
2f2dc053 SW	216	struct inode r_target_inode; / resulting inode */
2f2dc053 SW	217
bc2de10d JL	218	#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
	219	#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
	220	#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
	221	#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
	222	#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
	223	#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
3dd69aab	224	#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
bc2de10d JL	225	unsigned long r_req_flags;
bc2de10d JL	226
b4556396 SW	227	struct mutex r_fill_mutex;
b4556396 SW	228
2f2dc053 SW	229	union ceph_mds_request_args r_args;
2f2dc053 SW	230	int r_fmode; /* file mode, if expecting cap */
ff3d0046 EB	231	kuid_t r_uid;
ff3d0046 EB	232	kgid_t r_gid;
b8e69066	233	struct timespec r_stamp;
2f2dc053 SW	234
	235	/* for choosing which mds to send this request to */
	236	int r_direct_mode;
	237	u32 r_direct_hash; /* choose dir frag based on this dentry hash */
2f2dc053 SW	238
2f2dc053 SW	239	/* data payload is used for xattr ops */
25e6bae3	240	struct ceph_pagelist *r_pagelist;
2f2dc053 SW	241
	242	/* what caps shall we drop? */
	243	int r_inode_drop, r_inode_unless;
	244	int r_dentry_drop, r_dentry_unless;
	245	int r_old_dentry_drop, r_old_dentry_unless;
	246	struct inode *r_old_inode;
	247	int r_old_inode_drop, r_old_inode_unless;
	248
	249	struct ceph_msg r_request; / original request */
e979cf50	250	int r_request_release_offset;
2f2dc053 SW	251	struct ceph_msg *r_reply;
2f2dc053 SW	252	struct ceph_mds_reply_info_parsed r_reply_info;
01deead0	253	struct page *r_locked_page;
2f2dc053 SW	254	int r_err;
2f2dc053 SW	255
a319bf56	256	unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
2f2dc053 SW	257	unsigned long r_started; /* start time to measure timeout against */
	258	unsigned long r_request_started; /* start time for mds request only,
	259	used to measure lease durations */
	260
	261	/* link unsafe requests to parent directory, for fsync */
	262	struct inode *r_unsafe_dir;
	263	struct list_head r_unsafe_dir_item;
	264
68cd5b4b YZ	265	/* unsafe requests that modify the target inode */
	266	struct list_head r_unsafe_target_item;
	267
2f2dc053 SW	268	struct ceph_mds_session *r_session;
	269
	270	int r_attempts; /* resend attempts */
	271	int r_num_fwd; /* number of forward attempts */
2f2dc053	272	int r_resend_mds; /* mds to resend to next, if any*/
e55b71f8	273	u32 r_sent_on_mseq; /* cap mseq request was sent at*/
2f2dc053	274
153c8e6b	275	struct kref r_kref;
2f2dc053 SW	276	struct list_head r_wait;
	277	struct completion r_completion;
	278	struct completion r_safe_completion;
	279	ceph_mds_request_callback_t r_callback;
9280be24	280	ceph_mds_request_wait_callback_t r_wait_for_completion;
2f2dc053	281	struct list_head r_unsafe_item; /* per-session unsafe list item */
2f2dc053	282
fdd4e158 YZ	283	long long r_dir_release_cnt;
	284	long long r_dir_ordered_cnt;
	285	int r_readdir_cache_idx;
2f2dc053 SW	286	u32 r_readdir_offset;
	287
	288	struct ceph_cap_reservation r_caps_reservation;
	289	int r_num_caps;
	290	};
	291
10183a69 YZ	292	struct ceph_pool_perm {
10183a69 YZ	293	struct rb_node node;
10183a69	294	int perm;
7627151e	295	s64 pool;
779fe0fb YZ	296	size_t pool_ns_len;
779fe0fb YZ	297	char pool_ns[];
10183a69 YZ	298	};
10183a69 YZ	299
2f2dc053 SW	300	/*
	301	* mds client state
	302	*/
	303	struct ceph_mds_client {
3d14c5d2	304	struct ceph_fs_client *fsc;
2f2dc053 SW	305	struct mutex mutex; /* all nested structures */
	306
	307	struct ceph_mdsmap *mdsmap;
f3c60c59 SW	308	struct completion safe_umount_waiters;
f3c60c59 SW	309	wait_queue_head_t session_close_wq;
2f2dc053	310	struct list_head waiting_for_map;
430afbad	311	int mdsmap_err;
2f2dc053 SW	312
2f2dc053 SW	313	struct ceph_mds_session *sessions; / NULL for mds if no session */
86d8f67b	314	atomic_t num_sessions;
2f2dc053 SW	315	int max_sessions; /* len of s_mds_sessions */
	316	int stopping; /* true if shutting down */
	317
60147660 LH	318	atomic64_t quotarealms_count; /* # realms with quota */
60147660 LH	319
2f2dc053 SW	320	/*
	321	* snap_rwsem will cover cap linkage into snaprealms, and
	322	* realm snap contexts. (later, we can do per-realm snap
	323	* contexts locks..) the empty list contains realms with no
	324	* references (implying they contain no inodes with caps) that
	325	* should be destroyed.
	326	*/
affbc19a	327	u64 last_snap_seq;
2f2dc053	328	struct rw_semaphore snap_rwsem;
a105f00c	329	struct rb_root snap_realms;
2f2dc053 SW	330	struct list_head snap_empty;
	331	spinlock_t snap_empty_lock; /* protect snap_empty */
	332
	333	u64 last_tid; /* most recent mds request */
e8a7b8b1 YZ	334	u64 oldest_tid; /* oldest incomplete mds request,
e8a7b8b1 YZ	335	excluding setfilelock requests */
44ca18f2	336	struct rb_root request_tree; /* pending mds requests */
2f2dc053 SW	337	struct delayed_work delayed_work; /* delayed work */
	338	unsigned long last_renew_caps; /* last time we renewed our caps */
	339	struct list_head cap_delay_list; /* caps with delayed release */
	340	spinlock_t cap_delay_lock; /* protects cap_delay_list */
	341	struct list_head snap_flush_list; /* cap_snaps ready to flush */
	342	spinlock_t snap_flush_lock;
	343
553adfd9	344	u64 last_cap_flush_tid;
e4500b5e	345	struct list_head cap_flush_list;
2f2dc053	346	struct list_head cap_dirty; /* inodes with dirty caps */
db354052	347	struct list_head cap_dirty_migrating; /* ...that are migration... */
2f2dc053 SW	348	int num_cap_flushing; /* # caps we are flushing */
	349	spinlock_t cap_dirty_lock; /* protects above items */
	350	wait_queue_head_t cap_flushing_wq;
	351
37151668 YS	352	/*
	353	* Cap reservations
	354	*
	355	* Maintain a global pool of preallocated struct ceph_caps, referenced
	356	* by struct ceph_caps_reservations. This ensures that we preallocate
	357	* memory needed to successfully process an MDS response. (If an MDS
	358	* sends us cap information and we fail to process it, we will have
	359	* problems due to the client and MDS being out of sync.)
	360	*
	361	* Reservations are 'owned' by a ceph_cap_reservation context.
	362	*/
	363	spinlock_t caps_list_lock;
	364	struct list_head caps_list; /* unused (reserved or
	365	unreserved) */
	366	int caps_total_count; /* total caps allocated */
	367	int caps_use_count; /* in use */
	368	int caps_reserve_count; /* unused, reserved */
	369	int caps_avail_count; /* unused, unreserved */
	370	int caps_min_count; /* keep at least this many
	371	(unreserved) */
2f2dc053 SW	372	spinlock_t dentry_lru_lock;
	373	struct list_head dentry_lru;
	374	int num_dentry;
10183a69 YZ	375
	376	struct rw_semaphore pool_perm_rwsem;
	377	struct rb_root pool_perm_tree;
717e6f28 YZ	378
717e6f28 YZ	379	char nodename[__NEW_UTS_LEN + 1];
2f2dc053 SW	380	};
	381
	382	extern const char *ceph_mds_op_name(int op);
	383
	384	extern struct ceph_mds_session *
	385	__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
	386
	387	static inline struct ceph_mds_session *
	388	ceph_get_mds_session(struct ceph_mds_session *s)
	389	{
3997c01d	390	refcount_inc(&s->s_ref);
2f2dc053 SW	391	return s;
	392	}
	393
a687ecaf JS	394	extern const char *ceph_session_state_name(int s);
a687ecaf JS	395
2f2dc053 SW	396	extern void ceph_put_mds_session(struct ceph_mds_session *s);
	397
	398	extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
	399	struct ceph_msg *msg, int mds);
	400
3d14c5d2	401	extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
2f2dc053	402	extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
48fec5d0	403	extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
3d14c5d2	404	extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
2f2dc053 SW	405
	406	extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
	407
167c9e35	408	extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
54008399 YZ	409	extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
54008399 YZ	410	struct inode *dir);
2f2dc053 SW	411	extern struct ceph_mds_request *
	412	ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
	413	extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
	414	struct ceph_mds_request *req);
	415	extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
	416	struct inode *dir,
	417	struct ceph_mds_request *req);
	418	static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
	419	{
153c8e6b SW	420	kref_get(&req->r_kref);
	421	}
	422	extern void ceph_mdsc_release_request(struct kref *kref);
	423	static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
	424	{
	425	kref_put(&req->r_kref, ceph_mdsc_release_request);
2f2dc053	426	}
2f2dc053	427
1de82206 YZ	428	extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
	429	struct ceph_cap *cap);
	430	extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
	431	struct ceph_mds_session *session);
2f2dc053 SW	432	extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
	433
	434	extern char ceph_mdsc_build_path(struct dentry dentry, int plen, u64 base,
	435	int stop_on_nosnap);
	436
	437	extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
	438	extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
	439	struct inode *inode,
	440	struct dentry *dentry, char action,
	441	u32 seq);
	442
430afbad YZ	443	extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
	444	struct ceph_msg *msg);
	445	extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
	446	struct ceph_msg *msg);
2f2dc053	447
5d72d13c YZ	448	extern struct ceph_mds_session *
5d72d13c YZ	449	ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
154f42c2 SW	450	extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
	451	struct ceph_mds_session *session);
	452
2f2dc053	453	#endif