cregit-Linux how code gets into the kernel

Release 4.10 fs/ceph/mds_client.h

Directory: fs/ceph
#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/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;
};


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_complete;
			
bool			      dir_end;
			
bool			      hash_order;
			
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.
 */

#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE -                   \
                                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;

	
atomic_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_locked_dir; /* dir (if any) i_mutex locked by vfs */
	
struct inode *r_target_inode;       /* resulting inode */

	
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 */
	
bool r_direct_is_hash;  /* true if r_direct_hash is valid */

	/* 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;
	
bool r_aborted;

	
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 */
	


bool		  r_got_unsafe, r_got_safe, r_got_result;

	
bool              r_did_prepopulate;
	
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 */

	/*
         * 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;
};

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) { atomic_inc(&s->s_ref); return s; }

Contributors

PersonTokensPropCommitsCommitProp
sage weilsage weil25100.00%1100.00%
Total25100.00%1100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
sage weilsage weil20100.00%2100.00%
Total20100.00%2100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
sage weilsage weil22100.00%2100.00%
Total22100.00%2100.00%

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); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
sage weilsage weil99675.74%2236.67%
zhen yanzhen yan18013.69%2440.00%
yehuda sadehyehuda sadeh453.42%23.33%
zheng yanzheng yan362.74%35.00%
herb shiuherb shiu181.37%11.67%
sam langsam lang110.84%11.67%
alex elderalex elder110.84%23.33%
john sprayjohn spray100.76%11.67%
greg farnumgreg farnum40.30%11.67%
eric w. biedermaneric w. biederman20.15%11.67%
kirill a. shutemovkirill a. shutemov10.08%11.67%
ilya dryomovilya dryomov10.08%11.67%
Total1315100.00%60100.00%
Directory: fs/ceph
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.