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fid.c
254 lines (208 loc) · 6.15 KB
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fid.c
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#include <assert.h>
#include <gc/gc.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "9p.h"
#include "list.h"
#include "vector.h"
#include "hashtable.h"
#include "connection.h"
#include "fid.h"
#include "util.h"
#include "config.h"
#include "object.h"
#include "worker.h"
#include "claim.h"
/*
* Fid pool state
*/
Vector *fid_remote_vector;
List *fid_deleted_list;
void fid_insert_local(Connection *conn, u32 fid, char *user, Claim *claim) {
Fid *res = GC_NEW(Fid);
assert(res != NULL);
assert(conn != NULL);
assert(fid != NOFID);
assert(!emptystring(user));
assert(claim != NULL);
assert(!vector_test(conn->fid_vector, fid));
res->lock = NULL;
res->fid = fid;
res->pathname = claim->pathname;
res->user = user;
res->status = STATUS_UNOPENNED;
res->omode = 0;
res->readdir_cookie = 0;
res->addr = conn->addr;
res->isremote = 0;
res->claim = NULL;
res->readdir_env = NULL;
res->raddr = NULL;
res->rfid = NOFID;
fid_link_claim(res, claim);
vector_set(conn->fid_vector, res->fid, res);
hash_set(res->claim->lease->fids, res, res);
}
void fid_insert_remote(Connection *conn, u32 fid, char *pathname, char *user,
Address *raddr, u32 rfid)
{
Fid *res = GC_NEW(Fid);
assert(res != NULL);
assert(conn != NULL);
assert(fid != NOFID);
assert(rfid != NOFID);
assert(!emptystring(pathname));
assert(!emptystring(user));
assert(raddr != NULL);
assert(!vector_test(conn->fid_vector, fid));
res->lock = NULL;
res->fid = fid;
res->pathname = pathname;
res->user = user;
res->status = STATUS_UNOPENNED;
res->omode = 0;
res->readdir_cookie = 0;
res->addr = conn->addr;
res->isremote = 1;
res->claim = NULL;
res->readdir_env = NULL;
res->raddr = raddr;
res->rfid = rfid;
vector_set(conn->fid_vector, res->fid, res);
fid_set_remote(rfid, res);
}
void fid_update_remote(Fid *fid, char *pathname, Address *raddr, u32 rfid) {
fid->pathname = pathname;
fid->isremote = 1;
if (fid->claim != NULL) {
hash_remove(fid->claim->lease->fids, fid);
fid_unlink_claim(fid);
}
fid->raddr = raddr;
fid->rfid = rfid;
fid_set_remote(rfid, fid);
}
void fid_update_local(Fid *fid, Claim *claim) {
fid->pathname = claim->pathname;
fid->isremote = 0;
if (fid->claim != NULL && fid->claim != claim) {
hash_remove(fid->claim->lease->fids, fid);
fid_unlink_claim(fid);
}
fid->claim = NULL;
fid->readdir_cookie = 0;
fid->readdir_env = NULL;
fid->raddr = NULL;
fid->rfid = NOFID;
fid_link_claim(fid, claim);
hash_set(fid->claim->lease->fids, fid, fid);
}
int fid_cmp(const Fid *a, const Fid *b) {
int res = addr_cmp(a->addr, b->addr);
if (res == 0)
return (int) a->fid - (int) b->fid;
return res;
}
u32 fid_hash(const Fid *fid) {
return generic_hash(&fid->fid, sizeof(fid->fid), addr_hash(fid->addr));
}
Fid *fid_lookup(Connection *conn, u32 fid) {
assert(conn != NULL);
assert(fid != NOFID);
return vector_get(conn->fid_vector, fid);
}
void fid_remove(Worker *worker, Connection *conn, u32 fid) {
Fid *elt;
assert(conn != NULL);
assert(fid != NOFID);
elt = (Fid *) vector_get_remove(conn->fid_vector, fid);
assert(elt != NULL);
if (elt->isremote) {
fid_release_remote(elt->rfid);
} else {
Claim *claim = elt->claim;
assert(claim != NULL);
fid_unlink_claim(elt);
if (claim->deleted)
fid_unlink_deleted(elt);
else
hash_remove(claim->lease->fids, elt);
if (claim->exclusive && elt->status != STATUS_UNOPENNED)
claim->exclusive = 0;
/* was this the last unlink on a deleted file? */
if (claim->deleted && null(claim->fids) &&
claim->access == ACCESS_WRITEABLE)
{
object_delete(worker, claim->oid);
}
}
}
enum claim_access fid_access_child(enum claim_access access, int cowlink) {
if (access == ACCESS_WRITEABLE && cowlink)
return ACCESS_COW;
else
return access;
}
void fid_state_init(void) {
fid_remote_vector = vector_create(FID_REMOTE_VECTOR_SIZE);
fid_deleted_list = NULL;
}
u32 fid_reserve_remote(Worker *worker) {
u32 result = vector_alloc(fid_remote_vector, (void *) 0xdeadbeef);
worker_cleanup_add(worker, LOCK_REMOTE_FID, (void *) result);
return result;
}
void fid_set_remote(u32 rfid, Fid *fid) {
assert(vector_test(fid_remote_vector, rfid));
vector_set(fid_remote_vector, rfid, fid);
}
Fid *fid_get_remote(u32 rfid) {
return vector_get(fid_remote_vector, rfid);
}
void fid_release_remote(u32 fid) {
vector_remove(fid_remote_vector, fid);
}
List *fid_gather_groups(List *fids) {
Address *addr = NULL;
List *groups = NULL;
List *group = NULL;
/* gather the fids into groups by address */
for ( ; !null(fids); fids = cdr(fids)) {
Fid *fid = car(fids);
if (!addr_cmp(fid->addr, addr)) {
group = cons(fid, group);
} else {
if (!null(group))
groups = cons(group, groups);
group = cons(fid, NULL);
addr = fid->addr;
}
}
if (!null(group))
groups = cons(group, groups);
return groups;
}
void fid_link_claim(Fid *fid, Claim *claim) {
assert(fid->claim == NULL);
assert(claim->lease != NULL);
assert(claim->parent != NULL || !null(claim->children) ||
!strcmp(claim->lease->pathname, claim->pathname));
fid->claim = claim;
claim->fids = insertinorder((Cmpfunc) fid_cmp, claim->fids, fid);
}
void fid_unlink_claim(Fid *fid) {
assert(fid->claim != NULL);
fid->claim->fids = removeinorder((Cmpfunc) fid_cmp, fid->claim->fids, fid);
fid->claim = NULL;
}
void fid_link_deleted(Fid *fid) {
assert(fid->claim != NULL);
assert(fid->claim->deleted);
assert(fid->pathname == NULL);
fid_deleted_list = insertinorder((Cmpfunc) fid_cmp, fid_deleted_list, fid);
}
void fid_unlink_deleted(Fid *fid) {
assert(fid->claim == NULL);
fid_deleted_list = removeinorder((Cmpfunc) fid_cmp, fid_deleted_list, fid);
}