171 lines
5.2 KiB
C
171 lines
5.2 KiB
C
#ifndef SERVE_H
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#define SERVE_H
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#include <sys/types.h>
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#include <unistd.h>
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#include <signal.h> /* for sig_atomic_t */
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#include "flexnbd.h"
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#include "parse.h"
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#include "acl.h"
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static const int block_allocation_resolution = 4096;//128<<10;
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struct client_tbl_entry {
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pthread_t thread;
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union mysockaddr address;
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struct client * client;
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};
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#define MAX_NBD_CLIENTS 16
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#define CLIENT_KEEPALIVE_TIME 30
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#define CLIENT_KEEPALIVE_INTVL 10
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#define CLIENT_KEEPALIVE_PROBES 3
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struct server {
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/* The flexnbd wrapper this server is attached to */
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struct flexnbd * flexnbd;
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/** address/port to bind to */
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union mysockaddr bind_to;
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/** (static) file name to serve */
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char* filename;
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/** TCP backlog for listen() */
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int tcp_backlog;
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/** (static) file name of UNIX control socket (or NULL if none) */
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char* control_socket_name;
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/** size of file */
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uint64_t size;
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/** to interrupt accept loop and clients, write() to close_signal[1] */
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struct self_pipe * close_signal;
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/** access control list */
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struct acl * acl;
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/** acl_updated_signal will be signalled after the acl struct
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* has been replaced
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*/
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struct self_pipe * acl_updated_signal;
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/* Claimed around any updates to the ACL. */
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struct flexthread_mutex * l_acl;
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/* Claimed around starting a mirror so that it doesn't race with
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* shutting down on a SIGTERM. */
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struct flexthread_mutex * l_start_mirror;
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struct mirror* mirror;
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struct mirror_super * mirror_super;
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/* This is used to stop the mirror from starting after we
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* receive a SIGTERM */
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int mirror_can_start;
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int server_fd;
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int control_fd;
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/* the allocation_map keeps track of which blocks in the backing file
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* have been allocated, or part-allocated on disc, with unallocated
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* blocks presumed to contain zeroes (i.e. represented as sparse files
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* by the filesystem). We can use this information when receiving
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* incoming writes, and avoid writing zeroes to unallocated sections
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* of the file which would needlessly increase disc usage. This
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* bitmap will start at all-zeroes for an empty file, and tend towards
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* all-ones as the file is written to (i.e. we assume that allocated
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* blocks can never become unallocated again, as is the case with ext3
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* at least).
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*/
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struct bitset * allocation_map;
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/* when starting up, this thread builds the allocation_map */
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pthread_t allocation_map_builder_thread;
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/* when the thread has finished, it sets this to 1 */
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volatile sig_atomic_t allocation_map_built;
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volatile sig_atomic_t allocation_map_not_built;
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int max_nbd_clients;
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struct client_tbl_entry *nbd_client;
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/** Should clients use the killswitch? */
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int use_killswitch;
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/** If this isn't set, newly accepted clients will be closed immediately */
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int allow_new_clients;
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/* Marker for whether this server has control over the data in
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* the file, or if we're waiting to receive it from an inbound
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* migration which hasn't yet finished.
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*
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* It's the value which controls the exit status of a serve or
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* listen process.
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*/
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int success;
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};
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struct server * server_create(
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struct flexnbd * flexnbd,
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char* s_ip_address,
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char* s_port,
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char* s_file,
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int default_deny,
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int acl_entries,
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char** s_acl_entries,
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int max_nbd_clients,
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int use_killswitch,
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int success );
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void server_destroy( struct server * );
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int server_is_closed(struct server* serve);
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void serve_signal_close( struct server *serve );
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void serve_wait_for_close( struct server * serve );
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void server_replace_acl( struct server *serve, struct acl * acl);
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void server_control_arrived( struct server *serve );
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int server_is_in_control( struct server *serve );
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int server_default_deny( struct server * serve );
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int server_acl_locked( struct server * serve );
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void server_lock_acl( struct server *serve );
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void server_unlock_acl( struct server *serve );
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void server_lock_start_mirror( struct server *serve );
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void server_unlock_start_mirror( struct server *serve );
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int server_is_mirroring( struct server * serve );
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uint64_t server_mirror_bytes_remaining( struct server * serve );
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uint64_t server_mirror_eta( struct server * serve );
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uint64_t server_mirror_bps( struct server * serve );
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void server_abandon_mirror( struct server * serve );
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void server_prevent_mirror_start( struct server *serve );
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void server_allow_mirror_start( struct server *serve );
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int server_mirror_can_start( struct server *serve );
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/* These three functions are used by mirror around the final pass, to close
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* existing clients and prevent new ones from being around
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*/
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void server_forbid_new_clients( struct server *serve );
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void server_close_clients( struct server *serve );
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void server_join_clients( struct server *serve );
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void server_allow_new_clients( struct server *serve );
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/* Returns a count (ish) of the number of currently-running client threads */
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int server_count_clients( struct server *params );
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void server_unlink( struct server * serve );
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int do_serve( struct server *, struct self_pipe * );
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struct mode_readwrite_params {
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union mysockaddr connect_to;
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union mysockaddr connect_from;
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uint64_t from;
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uint32_t len;
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int data_fd;
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int client;
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};
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#endif
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