/*
* Insert a login token into the cache. If the user already has an entry,
* then overwrite the old entry.
*/
int
weblog_login_store(char *user, char *cell, char *cksum, char *token,
int tokenLen, afs_uint32 expiration)
{
int index;
long curTime;
struct weblog_login *loginP, *tmpP, loginTmp;
int parseToken(char *tokenBuf);
/*
* Search the hash chain for a matching entry, free
* expired entries as we search
*/
index = weblog_login_hash(user, cell);
curTime = time(NULL);
loginP = weblog_login_cache[index].head;
while (loginP != NULL) {
if (strcmp(loginP->username, user) == 0
&& strcmp(loginP->cellname, cell) == 0) {
break;
}
if (loginP->expiration < curTime) {
tmpP = loginP;
loginP = tmpP->next;
DLL_DELETE(tmpP, weblog_login_cache[index].head,
weblog_login_cache[index].tail, next, prev);
free(tmpP);
continue;
}
loginP = loginP->next;
}
if (loginP == NULL) {
loginP = (struct weblog_login *)malloc(sizeof(struct weblog_login));
strcpy(&loginP->username[0], user);
strcpy(&loginP->cellname[0], cell);
} else {
DLL_DELETE(loginP, weblog_login_cache[index].head,
weblog_login_cache[index].tail, next, prev);
}
memcpy((void *)&loginP->cksum[0], (void *)cksum, SHA_HASH_BYTES);
loginP->expiration = expiration;
loginP->tokenLen = getTokenLen(token);
memcpy((void *)&loginP->token[0], (void *)token, MAXBUFF);
DLL_INSERT_TAIL(loginP, weblog_login_cache[index].head,
weblog_login_cache[index].tail, next, prev);
return 0;
}
/* Release an Inode handle. All cached file descriptors for this
* inode are closed when the last reference to this handle is released
*/
static int
_ih_release_r(IHandle_t * ihP)
{
int ihash;
if (!ihP)
return 0;
osi_Assert(ihP->ih_refcnt > 0);
if (ihP->ih_refcnt > 1) {
ihP->ih_refcnt--;
return 0;
}
ihash = IH_HASH(ihP->ih_dev, ihP->ih_vid, ihP->ih_ino);
DLL_DELETE(ihP, ihashTable[ihash].ihash_head,
ihashTable[ihash].ihash_tail, ih_next, ih_prev);
ih_fdclose(ihP);
ihP->ih_refcnt--;
DLL_INSERT_TAIL(ihP, ihAvailHead, ihAvailTail, ih_next, ih_prev);
return 0;
}
/*
* Actually close the file descriptor handle and return it to
* the free list.
*/
int
fd_reallyclose(FdHandle_t * fdP)
{
FD_t closeFd;
IHandle_t *ihP;
if (!fdP)
return 0;
IH_LOCK;
osi_Assert(ih_Inited);
osi_Assert(fdInUseCount > 0);
osi_Assert(fdP->fd_status == FD_HANDLE_INUSE ||
fdP->fd_status == FD_HANDLE_CLOSING);
ihP = fdP->fd_ih;
closeFd = fdP->fd_fd;
fdP->fd_refcnt--;
if (fdP->fd_refcnt == 0) {
DLL_DELETE(fdP, ihP->ih_fdhead, ihP->ih_fdtail, fd_ihnext, fd_ihprev);
DLL_INSERT_TAIL(fdP, fdAvailHead, fdAvailTail, fd_next, fd_prev);
fdP->fd_status = FD_HANDLE_AVAIL;
fdP->fd_refcnt = 0;
fdP->fd_ih = NULL;
fdP->fd_fd = INVALID_FD;
}
/* All the file descriptor handles have been closed; reset
* the IH_REALLY_CLOSED flag indicating that ih_reallyclose
* has completed its job.
*/
if (!ihP->ih_fdhead) {
ihP->ih_flags &= ~IH_REALLY_CLOSED;
}
if (fdP->fd_refcnt == 0) {
IH_UNLOCK;
OS_CLOSE(closeFd);
IH_LOCK;
fdInUseCount -= 1;
}
/* If this is not the only reference to the Inode then we can decrement
* the reference count, otherwise we need to call ih_release. */
if (ihP->ih_refcnt > 1)
ihP->ih_refcnt--;
else
_ih_release_r(ihP);
IH_UNLOCK;
return 0;
}
/* Initialize an inode handle */
IHandle_t *
ih_init(int dev, int vid, Inode ino)
{
int ihash = IH_HASH(dev, vid, ino);
IHandle_t *ihP;
if (!ih_PkgDefaultsSet) {
ih_PkgDefaults();
}
IH_LOCK;
if (!ih_Inited) {
ih_Initialize();
}
/* Do we already have a handle for this Inode? */
for (ihP = ihashTable[ihash].ihash_head; ihP; ihP = ihP->ih_next) {
if (ihP->ih_ino == ino && ihP->ih_vid == vid && ihP->ih_dev == dev) {
ihP->ih_refcnt++;
IH_UNLOCK;
return ihP;
}
}
/* Allocate and initialize a new Inode handle */
if (ihAvailHead == NULL) {
iHandleAllocateChunk();
}
ihP = ihAvailHead;
osi_Assert(ihP->ih_refcnt == 0);
DLL_DELETE(ihP, ihAvailHead, ihAvailTail, ih_next, ih_prev);
ihP->ih_dev = dev;
ihP->ih_vid = vid;
ihP->ih_ino = ino;
ihP->ih_flags = 0;
ihP->ih_synced = 0;
ihP->ih_refcnt = 1;
DLL_INIT_LIST(ihP->ih_fdhead, ihP->ih_fdtail);
DLL_INSERT_TAIL(ihP, ihashTable[ihash].ihash_head,
ihashTable[ihash].ihash_tail, ih_next, ih_prev);
IH_UNLOCK;
return ihP;
}
/* Enable buffered I/O on a file descriptor */
StreamHandle_t *
stream_fdopen(FD_t fd)
{
StreamHandle_t *streamP;
IH_LOCK;
if (streamAvailHead == NULL) {
streamHandleAllocateChunk();
}
streamP = streamAvailHead;
DLL_DELETE(streamP, streamAvailHead, streamAvailTail, str_next, str_prev);
IH_UNLOCK;
streamP->str_fd = fd;
streamP->str_buflen = 0;
streamP->str_bufoff = 0;
streamP->str_error = 0;
streamP->str_eof = 0;
streamP->str_direction = STREAM_DIRECTION_NONE;
return streamP;
}
/*
* Look up a login ID in the cache. If an entry name is found for the
* given username, and the SHA checksums match, then
* set the token parameter and return 1, otherwise return 0.
*/
int
weblog_login_lookup(char *user, char *cell, char *cksum, char *token)
{
int index;
long curTime;
struct weblog_login *loginP, *tmpP, loginTmp;
/*
* Search the hash chain for a matching entry, free
* expired entries as we search
*/
index = weblog_login_hash(user, cell);
curTime = time(NULL);
loginP = weblog_login_cache[index].head;
while (loginP != NULL) {
if (loginP->expiration < curTime) {
tmpP = loginP;
loginP = tmpP->next;
DLL_DELETE(tmpP, weblog_login_cache[index].head,
weblog_login_cache[index].tail, next, prev);
free(tmpP);
continue;
}
if (strcmp(loginP->username, user) == 0
&& strcmp(loginP->cellname, cell) == 0
&& memcmp((void *)&loginP->cksum[0], (void *)cksum,
SHA_HASH_BYTES) == 0) {
memcpy((void *)token, (void *)&loginP->token[0], MAXBUFF);
return loginP->tokenLen;
}
loginP = loginP->next;
}
return 0;
}
/* Close all unused file descriptors associated with the inode
* handle. Called with IH_LOCK held. May drop and reacquire
* IH_LOCK. Sets the IH_REALLY_CLOSED flag in the inode handle
* if it fails to close all file handles.
*/
static int
ih_fdclose(IHandle_t * ihP)
{
int closeCount, closedAll;
FdHandle_t *fdP, *head, *tail, *next;
osi_Assert(ihP->ih_refcnt > 0);
closedAll = 1;
DLL_INIT_LIST(head, tail);
ihP->ih_flags &= ~IH_REALLY_CLOSED;
/*
* Remove the file descriptors for this Inode from the LRU queue
* and the IHandle queue and put them on a temporary queue so we
* can drop the lock before we close the files.
*/
for (fdP = ihP->ih_fdhead; fdP != NULL; fdP = next) {
next = fdP->fd_ihnext;
osi_Assert(fdP->fd_ih == ihP);
osi_Assert(fdP->fd_status == FD_HANDLE_OPEN
|| fdP->fd_status == FD_HANDLE_INUSE
|| fdP->fd_status == FD_HANDLE_CLOSING);
if (fdP->fd_status == FD_HANDLE_OPEN) {
/* Note that FdHandle_t's do not count against the parent
* IHandle_t ref count when they are FD_HANDLE_OPEN. So, we don't
* need to dec the parent IHandle_t ref count for each one we pull
* off here. */
DLL_DELETE(fdP, ihP->ih_fdhead, ihP->ih_fdtail, fd_ihnext,
fd_ihprev);
DLL_DELETE(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
DLL_INSERT_TAIL(fdP, head, tail, fd_next, fd_prev);
} else {
closedAll = 0;
fdP->fd_status = FD_HANDLE_CLOSING;
ihP->ih_flags |= IH_REALLY_CLOSED;
}
}
/* If the ihandle reference count is 1, we should have
* closed all file descriptors.
*/
if (ihP->ih_refcnt == 1 || closedAll) {
osi_Assert(closedAll);
osi_Assert(!ihP->ih_fdhead);
osi_Assert(!ihP->ih_fdtail);
}
if (head == NULL) {
return 0; /* No file descriptors closed */
}
IH_UNLOCK;
/*
* Close the file descriptors
*/
closeCount = 0;
for (fdP = head; fdP != NULL; fdP = fdP->fd_next) {
OS_CLOSE(fdP->fd_fd);
fdP->fd_status = FD_HANDLE_AVAIL;
fdP->fd_refcnt = 0;
fdP->fd_fd = INVALID_FD;
fdP->fd_ih = NULL;
closeCount++;
}
IH_LOCK;
osi_Assert(fdInUseCount >= closeCount);
fdInUseCount -= closeCount;
/*
* Append the temporary queue to the list of available descriptors
*/
if (fdAvailHead == NULL) {
fdAvailHead = head;
fdAvailTail = tail;
} else {
fdAvailTail->fd_next = head;
head->fd_prev = fdAvailTail;
fdAvailTail = tail;
}
return 0;
}
/*
* Get a file descriptor handle given an Inode handle
*/
FdHandle_t *
ih_open(IHandle_t * ihP)
{
FdHandle_t *fdP;
FD_t fd;
FD_t closeFd;
if (!ihP) /* XXX should log here in the fileserver */
return NULL;
IH_LOCK;
/* Do we already have an open file handle for this Inode? */
for (fdP = ihP->ih_fdtail; fdP != NULL; fdP = fdP->fd_ihprev) {
if (fdP->fd_status == FD_HANDLE_CLOSING) {
/* The handle was open when an IH_REALLYCLOSE was issued, so we
* cannot reuse it; it will be closed soon. */
continue;
}
#ifndef HAVE_PIO
/*
* If we don't have positional i/o, don't try to share fds, since
* we can't do so in a threadsafe way.
*/
if (fdP->fd_status == FD_HANDLE_INUSE) {
continue;
}
osi_Assert(fdP->fd_status == FD_HANDLE_OPEN);
#else /* HAVE_PIO */
osi_Assert(fdP->fd_status != FD_HANDLE_AVAIL);
#endif /* HAVE_PIO */
fdP->fd_refcnt++;
if (fdP->fd_status == FD_HANDLE_OPEN) {
fdP->fd_status = FD_HANDLE_INUSE;
DLL_DELETE(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
}
ihP->ih_refcnt++;
IH_UNLOCK;
return fdP;
}
/*
* Try to open the Inode, return NULL on error.
*/
fdInUseCount += 1;
IH_UNLOCK;
ih_open_retry:
fd = OS_IOPEN(ihP);
IH_LOCK;
if (fd == INVALID_FD && (errno != EMFILE || fdLruHead == NULL) ) {
fdInUseCount -= 1;
IH_UNLOCK;
return NULL;
}
/* fdCacheSize limits the size of the descriptor cache, but
* we permit the number of open files to exceed fdCacheSize.
* We only recycle open file descriptors when the number
* of open files reaches the size of the cache */
if ((fdInUseCount > fdCacheSize || fd == INVALID_FD) && fdLruHead != NULL) {
fdP = fdLruHead;
osi_Assert(fdP->fd_status == FD_HANDLE_OPEN);
DLL_DELETE(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
DLL_DELETE(fdP, fdP->fd_ih->ih_fdhead, fdP->fd_ih->ih_fdtail,
fd_ihnext, fd_ihprev);
closeFd = fdP->fd_fd;
if (fd == INVALID_FD) {
fdCacheSize--; /* reduce in order to not run into here too often */
DLL_INSERT_TAIL(fdP, fdAvailHead, fdAvailTail, fd_next, fd_prev);
fdP->fd_status = FD_HANDLE_AVAIL;
fdP->fd_ih = NULL;
fdP->fd_fd = INVALID_FD;
IH_UNLOCK;
OS_CLOSE(closeFd);
goto ih_open_retry;
}
} else {
if (fdAvailHead == NULL) {
fdHandleAllocateChunk();
}
fdP = fdAvailHead;
osi_Assert(fdP->fd_status == FD_HANDLE_AVAIL);
DLL_DELETE(fdP, fdAvailHead, fdAvailTail, fd_next, fd_prev);
closeFd = INVALID_FD;
}
fdP->fd_status = FD_HANDLE_INUSE;
fdP->fd_fd = fd;
fdP->fd_ih = ihP;
fdP->fd_refcnt++;
ihP->ih_refcnt++;
/* Add this handle to the Inode's list of open descriptors */
DLL_INSERT_TAIL(fdP, ihP->ih_fdhead, ihP->ih_fdtail, fd_ihnext,
fd_ihprev);
if (closeFd != INVALID_FD) {
IH_UNLOCK;
OS_CLOSE(closeFd);
IH_LOCK;
fdInUseCount -= 1;
}
IH_UNLOCK;
return fdP;
}
/*
* Get a file descriptor handle given an Inode handle
*/
FdHandle_t *
ih_open(IHandle_t * ihP)
{
FdHandle_t *fdP;
FD_t fd;
FD_t closeFd;
if (!ihP) /* XXX should log here in the fileserver */
return NULL;
IH_LOCK;
/* Do we already have an open file handle for this Inode? */
for (fdP = ihP->ih_fdtail; fdP != NULL; fdP = fdP->fd_ihprev) {
if (fdP->fd_status != FD_HANDLE_INUSE) {
assert(fdP->fd_status == FD_HANDLE_OPEN);
fdP->fd_status = FD_HANDLE_INUSE;
DLL_DELETE(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
ihP->ih_refcnt++;
IH_UNLOCK;
(void)FDH_SEEK(fdP, 0, SEEK_SET);
return fdP;
}
}
/*
* Try to open the Inode, return NULL on error.
*/
fdInUseCount += 1;
IH_UNLOCK;
ih_open_retry:
fd = OS_IOPEN(ihP);
IH_LOCK;
if (fd == INVALID_FD && (errno != EMFILE || fdLruHead == NULL) ) {
fdInUseCount -= 1;
IH_UNLOCK;
return NULL;
}
/* fdCacheSize limits the size of the descriptor cache, but
* we permit the number of open files to exceed fdCacheSize.
* We only recycle open file descriptors when the number
* of open files reaches the size of the cache */
if ((fdInUseCount > fdCacheSize || fd == INVALID_FD) && fdLruHead != NULL) {
fdP = fdLruHead;
assert(fdP->fd_status == FD_HANDLE_OPEN);
DLL_DELETE(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
DLL_DELETE(fdP, fdP->fd_ih->ih_fdhead, fdP->fd_ih->ih_fdtail,
fd_ihnext, fd_ihprev);
closeFd = fdP->fd_fd;
if (fd == INVALID_FD) {
fdCacheSize--; /* reduce in order to not run into here too often */
DLL_INSERT_TAIL(fdP, fdAvailHead, fdAvailTail, fd_next, fd_prev);
fdP->fd_status = FD_HANDLE_AVAIL;
fdP->fd_ih = NULL;
fdP->fd_fd = INVALID_FD;
IH_UNLOCK;
OS_CLOSE(closeFd);
goto ih_open_retry;
}
} else {
if (fdAvailHead == NULL) {
fdHandleAllocateChunk();
}
fdP = fdAvailHead;
assert(fdP->fd_status == FD_HANDLE_AVAIL);
DLL_DELETE(fdP, fdAvailHead, fdAvailTail, fd_next, fd_prev);
closeFd = INVALID_FD;
}
fdP->fd_status = FD_HANDLE_INUSE;
fdP->fd_fd = fd;
fdP->fd_ih = ihP;
ihP->ih_refcnt++;
/* Add this handle to the Inode's list of open descriptors */
DLL_INSERT_TAIL(fdP, ihP->ih_fdhead, ihP->ih_fdtail, fd_ihnext,
fd_ihprev);
if (closeFd != INVALID_FD) {
IH_UNLOCK;
OS_CLOSE(closeFd);
IH_LOCK;
fdInUseCount -= 1;
}
IH_UNLOCK;
return fdP;
}
