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openafs/src/vol/ihandle.c
Simon Wilkinson f28659bd82 vol-prototypes-20090316 
LICENSE IPL10
FIXES 124252

prototype the vol directory
2009-03-16 13:11:42 +00:00

965 lines
22 KiB
C
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/*
* Copyright 2000, International Business Machines Corporation and others.
* All Rights Reserved.
*
* This software has been released under the terms of the IBM Public
* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
*/
/* ihandle.c - file descriptor cacheing for Inode handles. */
/* */
/************************************************************************/
#include <afsconfig.h>
#include <afs/param.h>
RCSID
("$Header$");
#include <stdio.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#ifdef AFS_NT40_ENV
#include <fcntl.h>
#else
#include <sys/file.h>
#include <unistd.h>
#include <sys/stat.h>
#if defined(AFS_SUN5_ENV) || defined(AFS_NBSD_ENV)
#include <sys/fcntl.h>
#include <sys/resource.h>
#endif
#endif
#include <rx/xdr.h>
#include <afs/afsint.h>
#include <errno.h>
#include <afs/afssyscalls.h>
#include "nfs.h"
#include "ihandle.h"
#include "viceinode.h"
#ifdef AFS_PTHREAD_ENV
#include <assert.h>
#else /* AFS_PTHREAD_ENV */
#include "afs/assert.h"
#endif /* AFS_PTHREAD_ENV */
#include <limits.h>
#ifndef AFS_NT40_ENV
#ifdef O_LARGEFILE
#define afs_stat stat64
#define afs_fstat fstat64
#else /* !O_LARGEFILE */
#define afs_stat stat
#define afs_fstat fstat
#endif /* !O_LARGEFILE */
#endif /* AFS_NT40_ENV */
#ifdef AFS_PTHREAD_ENV
pthread_once_t ih_glock_once = PTHREAD_ONCE_INIT;
pthread_mutex_t ih_glock_mutex;
#endif /* AFS_PTHREAD_ENV */
/* Linked list of available inode handles */
IHandle_t *ihAvailHead;
IHandle_t *ihAvailTail;
/* Linked list of available file descriptor handles */
FdHandle_t *fdAvailHead;
FdHandle_t *fdAvailTail;
/* Linked list of available stream descriptor handles */
StreamHandle_t *streamAvailHead;
StreamHandle_t *streamAvailTail;
/* LRU list for file descriptor handles */
FdHandle_t *fdLruHead;
FdHandle_t *fdLruTail;
int ih_Inited = 0;
/* Most of the servers use fopen/fdopen. Since the FILE structure
* only has eight bits for the file descriptor, the cache size
* has to be less than 256. The cache can be made larger as long
* as you are sure you don't need fopen/fdopen. */
int fdMaxCacheSize = 0;
int fdCacheSize = 0;
/* Number of in use file descriptors */
int fdInUseCount = 0;
/* Hash table for inode handles */
IHashBucket_t ihashTable[I_HANDLE_HASH_SIZE];
void *ih_sync_thread(void *);
#ifdef AFS_PTHREAD_ENV
/* Initialize the global ihandle mutex */
void
ih_glock_init()
{
assert(pthread_mutex_init(&ih_glock_mutex, NULL) == 0);
}
#endif /* AFS_PTHREAD_ENV */
/* Initialize the file descriptor cache */
void
ih_Initialize(void)
{
int i;
assert(!ih_Inited);
ih_Inited = 1;
DLL_INIT_LIST(ihAvailHead, ihAvailTail);
DLL_INIT_LIST(fdAvailHead, fdAvailTail);
DLL_INIT_LIST(fdLruHead, fdLruTail);
for (i = 0; i < I_HANDLE_HASH_SIZE; i++) {
DLL_INIT_LIST(ihashTable[i].ihash_head, ihashTable[i].ihash_tail);
}
#if defined(AFS_NT40_ENV)
fdMaxCacheSize = FD_MAX_CACHESIZE;
#elif defined(AFS_SUN5_ENV) || defined(AFS_NBSD_ENV)
{
struct rlimit rlim;
assert(getrlimit(RLIMIT_NOFILE, &rlim) == 0);
rlim.rlim_cur = rlim.rlim_max;
assert(setrlimit(RLIMIT_NOFILE, &rlim) == 0);
fdMaxCacheSize = rlim.rlim_cur - FD_HANDLE_SETASIDE;
#ifdef AFS_NBSD_ENV
/* XXX this is to avoid using up all system fd netbsd is
* somewhat broken and have set maximum fd for a root process
* to the same as system fd that is avaible, so if the
* fileserver uses all up process fds, all system fd will be
* used up too !
*
* Check for this better
*/
fdMaxCacheSize /= 4;
#endif
fdMaxCacheSize = MIN(fdMaxCacheSize, FD_MAX_CACHESIZE);
assert(fdMaxCacheSize > 0);
}
#elif defined(AFS_HPUX_ENV)
/* Avoid problems with "UFSOpen: igetinode failed" panics on HPUX 11.0 */
fdMaxCacheSize = 0;
#else
{
long fdMax = MAX(sysconf(_SC_OPEN_MAX) - FD_HANDLE_SETASIDE, 0);
fdMaxCacheSize = (int)MIN(fdMax, FD_MAX_CACHESIZE);
}
#endif
fdCacheSize = MIN(fdMaxCacheSize, FD_DEFAULT_CACHESIZE);
{
#ifdef AFS_PTHREAD_ENV
pthread_t syncer;
pthread_attr_t tattr;
pthread_attr_init(&tattr);
pthread_attr_setdetachstate(&tattr,PTHREAD_CREATE_DETACHED);
pthread_create(&syncer, &tattr, ih_sync_thread, NULL);
#else /* AFS_PTHREAD_ENV */
PROCESS syncer;
LWP_CreateProcess(ih_sync_thread, 16*1024, LWP_MAX_PRIORITY - 2,
NULL, "ih_syncer", &syncer);
#endif /* AFS_PTHREAD_ENV */
}
}
/* Make the file descriptor cache as big as possible. Don't this call
* if the program uses fopen or fdopen. */
void
ih_UseLargeCache(void)
{
IH_LOCK;
if (!ih_Inited) {
ih_Initialize();
}
fdCacheSize = fdMaxCacheSize;
IH_UNLOCK;
}
/* Allocate a chunk of inode handles */
void
iHandleAllocateChunk(void)
{
int i;
IHandle_t *ihP;
assert(ihAvailHead == NULL);
ihP = (IHandle_t *) malloc(I_HANDLE_MALLOCSIZE * sizeof(IHandle_t));
assert(ihP != NULL);
for (i = 0; i < I_HANDLE_MALLOCSIZE; i++) {
ihP[i].ih_refcnt = 0;
DLL_INSERT_TAIL(&ihP[i], ihAvailHead, ihAvailTail, ih_next, ih_prev);
}
}
/* Initialize an inode handle */
IHandle_t *
ih_init(int dev, int vid, Inode ino)
{
int ihash = IH_HASH(dev, vid, ino);
IHandle_t *ihP;
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;
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_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;
}
/* Copy an inode handle */
IHandle_t *
ih_copy(IHandle_t * ihP)
{
IH_LOCK;
assert(ih_Inited);
assert(ihP->ih_refcnt > 0);
ihP->ih_refcnt++;
IH_UNLOCK;
return ihP;
}
/* Allocate a chunk of file descriptor handles */
void
fdHandleAllocateChunk(void)
{
int i;
FdHandle_t *fdP;
assert(fdAvailHead == NULL);
fdP = (FdHandle_t *) malloc(FD_HANDLE_MALLOCSIZE * sizeof(FdHandle_t));
assert(fdP != NULL);
for (i = 0; i < FD_HANDLE_MALLOCSIZE; i++) {
fdP[i].fd_status = FD_HANDLE_AVAIL;
fdP[i].fd_ih = NULL;
fdP[i].fd_fd = INVALID_FD;
DLL_INSERT_TAIL(&fdP[i], fdAvailHead, fdAvailTail, fd_next, fd_prev);
}
}
/* Allocate a chunk of stream handles */
void
streamHandleAllocateChunk(void)
{
int i;
StreamHandle_t *streamP;
assert(streamAvailHead == NULL);
streamP = (StreamHandle_t *)
malloc(STREAM_HANDLE_MALLOCSIZE * sizeof(StreamHandle_t));
assert(streamP != NULL);
for (i = 0; i < STREAM_HANDLE_MALLOCSIZE; i++) {
streamP[i].str_fd = INVALID_FD;
DLL_INSERT_TAIL(&streamP[i], streamAvailHead, streamAvailTail,
str_next, str_prev);
}
}
/*
* 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;
}
/*
* Return a file descriptor handle to the cache
*/
int
fd_close(FdHandle_t * fdP)
{
IHandle_t *ihP;
if (!fdP)
return 0;
IH_LOCK;
assert(ih_Inited);
assert(fdInUseCount > 0);
assert(fdP->fd_status == FD_HANDLE_INUSE);
ihP = fdP->fd_ih;
/* Call fd_reallyclose to really close the unused file handles if
* the previous attempt to close (ih_reallyclose()) all file handles
* failed (this is determined by checking the ihandle for the flag
* IH_REALLY_CLOSED) or we have too many open files.
*/
if (ihP->ih_flags & IH_REALLY_CLOSED || fdInUseCount > fdCacheSize) {
IH_UNLOCK;
return fd_reallyclose(fdP);
}
/* Put this descriptor back into the cache */
fdP->fd_status = FD_HANDLE_OPEN;
DLL_INSERT_TAIL(fdP, fdLruHead, fdLruTail, fd_next, fd_prev);
/* 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--;
IH_UNLOCK;
} else {
IH_UNLOCK;
ih_release(ihP);
}
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;
assert(ih_Inited);
assert(fdInUseCount > 0);
assert(fdP->fd_status == FD_HANDLE_INUSE);
ihP = fdP->fd_ih;
closeFd = fdP->fd_fd;
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_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;
}
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--;
IH_UNLOCK;
} else {
IH_UNLOCK;
ih_release(ihP);
}
return 0;
}
/* 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;
}
/* Open a file for buffered I/O */
StreamHandle_t *
stream_open(const char *filename, const char *mode)
{
FD_t fd = INVALID_FD;
if (strcmp(mode, "r") == 0) {
fd = OS_OPEN(filename, O_RDONLY, 0);
} else if (strcmp(mode, "r+") == 0) {
fd = OS_OPEN(filename, O_RDWR, 0);
} else if (strcmp(mode, "w") == 0) {
fd = OS_OPEN(filename, O_WRONLY | O_TRUNC | O_CREAT, 0);
} else if (strcmp(mode, "w+") == 0) {
fd = OS_OPEN(filename, O_RDWR | O_TRUNC | O_CREAT, 0);
} else if (strcmp(mode, "a") == 0) {
fd = OS_OPEN(filename, O_WRONLY | O_APPEND | O_CREAT, 0);
} else if (strcmp(mode, "a+") == 0) {
fd = OS_OPEN(filename, O_RDWR | O_APPEND | O_CREAT, 0);
} else {
assert(FALSE); /* not implemented */
}
if (fd == INVALID_FD) {
return NULL;
}
return stream_fdopen(fd);
}
/* fread for buffered I/O handles */
afs_sfsize_t
stream_read(void *ptr, afs_fsize_t size, afs_fsize_t nitems,
StreamHandle_t * streamP)
{
afs_fsize_t nbytes, bytesRead, bytesToRead;
char *p;
/* Need to seek before changing direction */
if (streamP->str_direction == STREAM_DIRECTION_NONE) {
streamP->str_direction = STREAM_DIRECTION_READ;
streamP->str_bufoff = 0;
streamP->str_buflen = 0;
} else {
assert(streamP->str_direction == STREAM_DIRECTION_READ);
}
bytesRead = 0;
nbytes = size * nitems;
p = (char *)ptr;
while (nbytes > 0 && !streamP->str_eof) {
if (streamP->str_buflen == 0) {
streamP->str_bufoff = 0;
streamP->str_buflen =
OS_READ(streamP->str_fd, streamP->str_buffer,
STREAM_HANDLE_BUFSIZE);
if (streamP->str_buflen < 0) {
streamP->str_error = errno;
streamP->str_buflen = 0;
bytesRead = 0;
break;
} else if (streamP->str_buflen == 0) {
streamP->str_eof = 1;
break;
}
}
bytesToRead = nbytes;
if (bytesToRead > streamP->str_buflen) {
bytesToRead = streamP->str_buflen;
}
memcpy(p, streamP->str_buffer + streamP->str_bufoff, bytesToRead);
p += bytesToRead;
streamP->str_bufoff += bytesToRead;
streamP->str_buflen -= bytesToRead;
bytesRead += bytesToRead;
nbytes -= bytesToRead;
}
return (bytesRead / size);
}
/* fwrite for buffered I/O handles */
afs_sfsize_t
stream_write(void *ptr, afs_fsize_t size, afs_fsize_t nitems,
StreamHandle_t * streamP)
{
char *p;
afs_sfsize_t rc;
afs_fsize_t nbytes, bytesWritten, bytesToWrite;
/* Need to seek before changing direction */
if (streamP->str_direction == STREAM_DIRECTION_NONE) {
streamP->str_direction = STREAM_DIRECTION_WRITE;
streamP->str_bufoff = 0;
streamP->str_buflen = STREAM_HANDLE_BUFSIZE;
} else {
assert(streamP->str_direction == STREAM_DIRECTION_WRITE);
}
nbytes = size * nitems;
bytesWritten = 0;
p = (char *)ptr;
while (nbytes > 0) {
if (streamP->str_buflen == 0) {
rc = OS_WRITE(streamP->str_fd, streamP->str_buffer,
STREAM_HANDLE_BUFSIZE);
if (rc < 0) {
streamP->str_error = errno;
bytesWritten = 0;
break;
}
streamP->str_bufoff = 0;
streamP->str_buflen = STREAM_HANDLE_BUFSIZE;
}
bytesToWrite = nbytes;
if (bytesToWrite > streamP->str_buflen) {
bytesToWrite = streamP->str_buflen;
}
memcpy(streamP->str_buffer + streamP->str_bufoff, p, bytesToWrite);
p += bytesToWrite;
streamP->str_bufoff += bytesToWrite;
streamP->str_buflen -= bytesToWrite;
bytesWritten += bytesToWrite;
nbytes -= bytesToWrite;
}
return (bytesWritten / size);
}
/* fseek for buffered I/O handles */
int
stream_seek(StreamHandle_t * streamP, afs_foff_t offset, int whence)
{
int rc;
int retval = 0;
if (streamP->str_direction == STREAM_DIRECTION_WRITE
&& streamP->str_bufoff > 0) {
rc = OS_WRITE(streamP->str_fd, streamP->str_buffer,
streamP->str_bufoff);
if (rc < 0) {
streamP->str_error = errno;
retval = -1;
}
}
streamP->str_bufoff = 0;
streamP->str_buflen = 0;
streamP->str_eof = 0;
streamP->str_direction = STREAM_DIRECTION_NONE;
if (OS_SEEK(streamP->str_fd, offset, whence) < 0) {
streamP->str_error = errno;
retval = -1;
}
return retval;
}
/* fflush for buffered I/O handles */
int
stream_flush(StreamHandle_t * streamP)
{
int rc;
int retval = 0;
if (streamP->str_direction == STREAM_DIRECTION_WRITE
&& streamP->str_bufoff > 0) {
rc = OS_WRITE(streamP->str_fd, streamP->str_buffer,
streamP->str_bufoff);
if (rc < 0) {
streamP->str_error = errno;
retval = -1;
}
streamP->str_bufoff = 0;
streamP->str_buflen = STREAM_HANDLE_BUFSIZE;
}
return retval;
}
/* Free a buffered I/O handle */
int
stream_close(StreamHandle_t * streamP, int reallyClose)
{
int rc;
int retval = 0;
assert(streamP != NULL);
if (streamP->str_direction == STREAM_DIRECTION_WRITE
&& streamP->str_bufoff > 0) {
rc = OS_WRITE(streamP->str_fd, streamP->str_buffer,
streamP->str_bufoff);
if (rc < 0) {
retval = -1;
}
}
if (reallyClose) {
rc = OS_CLOSE(streamP->str_fd);
if (rc < 0) {
retval = -1;
}
}
streamP->str_fd = INVALID_FD;
IH_LOCK;
DLL_INSERT_TAIL(streamP, streamAvailHead, streamAvailTail,
str_next, str_prev);
IH_UNLOCK;
return retval;
}
/* 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;
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;
assert(fdP->fd_ih == ihP);
assert(fdP->fd_status == FD_HANDLE_OPEN
|| fdP->fd_status == FD_HANDLE_INUSE);
if (fdP->fd_status == FD_HANDLE_OPEN) {
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;
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) {
assert(closedAll);
assert(!ihP->ih_fdhead);
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_fd = INVALID_FD;
fdP->fd_ih = NULL;
closeCount++;
}
IH_LOCK;
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;
}
/* Close all cached file descriptors for this inode. */
int
ih_reallyclose(IHandle_t * ihP)
{
if (!ihP)
return 0;
IH_LOCK;
assert(ihP->ih_refcnt > 0);
ih_fdclose(ihP);
IH_UNLOCK;
return 0;
}
/* Release an Inode handle. All cached file descriptors for this
* inode are closed when the last reference to this handle is released
*/
int
ih_release(IHandle_t * ihP)
{
int ihash;
if (!ihP)
return 0;
IH_LOCK;
assert(ihP->ih_refcnt > 0);
if (ihP->ih_refcnt > 1) {
ihP->ih_refcnt--;
IH_UNLOCK;
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);
IH_UNLOCK;
return 0;
}
/* Sync an inode to disk if its handle isn't NULL */
int
ih_condsync(IHandle_t * ihP)
{
int code;
FdHandle_t *fdP;
if (!ihP)
return 0;
fdP = IH_OPEN(ihP);
if (fdP == NULL)
return -1;
code = FDH_SYNC(fdP);
FDH_CLOSE(fdP);
return code;
}
void
ih_sync_all(void) {
int ihash;
IH_LOCK;
for (ihash = 0; ihash < I_HANDLE_HASH_SIZE; ihash++) {
IHandle_t *ihP, *ihPnext;
ihP = ihashTable[ihash].ihash_head;
if (ihP)
ihP->ih_refcnt++; /* must not disappear over unlock */
for (; ihP; ihP = ihPnext) {
if (ihP->ih_synced) {
FdHandle_t *fdP;
ihP->ih_synced = 0;
IH_UNLOCK;
fdP = IH_OPEN(ihP);
if (fdP) OS_SYNC(fdP->fd_fd);
FDH_CLOSE(fdP);
IH_LOCK;
}
/* when decrementing the refcount, the ihandle might disappear
and we might not even be able to proceed to the next one.
Hence the gymnastics putting a hold on the next one already */
ihPnext = ihP->ih_next;
if (ihPnext) ihPnext->ih_refcnt++;
if (ihP->ih_refcnt > 1) {
ihP->ih_refcnt--;
} else {
IH_UNLOCK;
ih_release(ihP);
IH_LOCK;
}
}
}
IH_UNLOCK;
}
void *
ih_sync_thread(void *dummy) {
while(1) {
#ifdef AFS_PTHREAD_ENV
sleep(10);
#else /* AFS_PTHREAD_ENV */
IOMGR_Sleep(60);
#endif /* AFS_PTHREAD_ENV */
#ifndef AFS_NT40_ENV
sync();
#endif
ih_sync_all();
}
return NULL;
}
/*************************************************************************
* OS specific support routines.
*************************************************************************/
#ifndef AFS_NAMEI_ENV
Inode
ih_icreate(IHandle_t * ih, int dev, char *part, Inode nI, int p1, int p2,
int p3, int p4)
{
Inode ino;
#ifdef AFS_3DISPARES
/* See viceinode.h */
if (p2 == INODESPECIAL) {
int tp = p3;
p3 = p4;
p4 = tp;
}
#endif
ino = ICREATE(dev, part, nI, p1, p2, p3, p4);
return ino;
}
#endif /* AFS_NAMEI_ENV */
#ifndef AFS_NT40_ENV
afs_sfsize_t
ih_size(int fd)
{
struct afs_stat status;
if (afs_fstat(fd, &status) < 0)
return -1;
return status.st_size;
}
#endif
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