/*
- * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <stdlib.h>
#include <unistd.h>
+#include <sched.h>
#include <signal.h>
#include <errno.h>
-#include <sched.h>
-#include <sys/syscall.h>
-#include "os.h"
+#include <sys/time.h>
+#include <asm/unistd.h>
#include "aio.h"
#include "init.h"
+#include "kern_constants.h"
+#include "kern_util.h"
+#include "os.h"
#include "user.h"
-#include "mode.h"
struct aio_thread_req {
enum aio_type type;
struct aio_context *aio;
};
-static int aio_req_fd_r = -1;
-static int aio_req_fd_w = -1;
-
#if defined(HAVE_AIO_ABI)
#include <linux/aio_abi.h>
-/* If we have the headers, we are going to build with AIO enabled.
+/*
+ * If we have the headers, we are going to build with AIO enabled.
* If we don't have aio in libc, we define the necessary stubs here.
*/
#endif
-/* The AIO_MMAP cases force the mmapped page into memory here
+/*
+ * The AIO_MMAP cases force the mmapped page into memory here
* rather than in whatever place first touches the data. I used
* to do this by touching the page, but that's delicate because
* gcc is prone to optimizing that away. So, what's done here
static int do_aio(aio_context_t ctx, enum aio_type type, int fd, char *buf,
int len, unsigned long long offset, struct aio_context *aio)
{
- struct iocb iocb, *iocbp = &iocb;
+ struct iocb *iocbp = & ((struct iocb) {
+ .aio_data = (unsigned long) aio,
+ .aio_fildes = fd,
+ .aio_buf = (unsigned long) buf,
+ .aio_nbytes = len,
+ .aio_offset = offset
+ });
char c;
- int err;
- iocb = ((struct iocb) { .aio_data = (unsigned long) aio,
- .aio_reqprio = 0,
- .aio_fildes = fd,
- .aio_buf = (unsigned long) buf,
- .aio_nbytes = len,
- .aio_offset = offset,
- .aio_reserved1 = 0,
- .aio_reserved2 = 0,
- .aio_reserved3 = 0 });
-
- switch(type){
+ switch (type) {
case AIO_READ:
- iocb.aio_lio_opcode = IOCB_CMD_PREAD;
- err = io_submit(ctx, 1, &iocbp);
+ iocbp->aio_lio_opcode = IOCB_CMD_PREAD;
break;
case AIO_WRITE:
- iocb.aio_lio_opcode = IOCB_CMD_PWRITE;
- err = io_submit(ctx, 1, &iocbp);
+ iocbp->aio_lio_opcode = IOCB_CMD_PWRITE;
break;
case AIO_MMAP:
- iocb.aio_lio_opcode = IOCB_CMD_PREAD;
- iocb.aio_buf = (unsigned long) &c;
- iocb.aio_nbytes = sizeof(c);
- err = io_submit(ctx, 1, &iocbp);
+ iocbp->aio_lio_opcode = IOCB_CMD_PREAD;
+ iocbp->aio_buf = (unsigned long) &c;
+ iocbp->aio_nbytes = sizeof(c);
break;
default:
- printk("Bogus op in do_aio - %d\n", type);
- err = -EINVAL;
- break;
+ printk(UM_KERN_ERR "Bogus op in do_aio - %d\n", type);
+ return -EINVAL;
}
- if(err > 0)
- err = 0;
- else
- err = -errno;
-
- return err;
+ return (io_submit(ctx, 1, &iocbp) > 0) ? 0 : -errno;
}
+/* Initialized in an initcall and unchanged thereafter */
static aio_context_t ctx = 0;
static int aio_thread(void *arg)
signal(SIGWINCH, SIG_IGN);
- while(1){
+ while (1) {
n = io_getevents(ctx, 1, 1, &event, NULL);
- if(n < 0){
- if(errno == EINTR)
+ if (n < 0) {
+ if (errno == EINTR)
continue;
- printk("aio_thread - io_getevents failed, "
+ printk(UM_KERN_ERR "aio_thread - io_getevents failed, "
"errno = %d\n", errno);
}
else {
{ .data = (void *) (long) event.data,
.err = event.res });
reply_fd = ((struct aio_context *) reply.data)->reply_fd;
- err = os_write_file(reply_fd, &reply, sizeof(reply));
- if(err != sizeof(reply))
- printk("aio_thread - write failed, fd = %d, "
- "err = %d\n", aio_req_fd_r, -err);
+ err = write(reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply))
+ printk(UM_KERN_ERR "aio_thread - write failed, "
+ "fd = %d, err = %d\n", reply_fd, errno);
}
}
return 0;
static int do_not_aio(struct aio_thread_req *req)
{
char c;
- int err;
+ unsigned long long actual;
+ int n;
- switch(req->type){
- case AIO_READ:
- err = os_seek_file(req->io_fd, req->offset);
- if(err)
- goto out;
+ actual = lseek64(req->io_fd, req->offset, SEEK_SET);
+ if (actual != req->offset)
+ return -errno;
- err = os_read_file(req->io_fd, req->buf, req->len);
+ switch (req->type) {
+ case AIO_READ:
+ n = read(req->io_fd, req->buf, req->len);
break;
case AIO_WRITE:
- err = os_seek_file(req->io_fd, req->offset);
- if(err)
- goto out;
-
- err = os_write_file(req->io_fd, req->buf, req->len);
+ n = write(req->io_fd, req->buf, req->len);
break;
case AIO_MMAP:
- err = os_seek_file(req->io_fd, req->offset);
- if(err)
- goto out;
-
- err = os_read_file(req->io_fd, &c, sizeof(c));
+ n = read(req->io_fd, &c, sizeof(c));
break;
default:
- printk("do_not_aio - bad request type : %d\n", req->type);
- err = -EINVAL;
- break;
+ printk(UM_KERN_ERR "do_not_aio - bad request type : %d\n",
+ req->type);
+ return -EINVAL;
}
-out:
- return err;
+ if (n < 0)
+ return -errno;
+ return 0;
}
+/* These are initialized in initcalls and not changed */
+static int aio_req_fd_r = -1;
+static int aio_req_fd_w = -1;
+static int aio_pid = -1;
+static unsigned long aio_stack;
+
static int not_aio_thread(void *arg)
{
struct aio_thread_req req;
int err;
signal(SIGWINCH, SIG_IGN);
- while(1){
- err = os_read_file(aio_req_fd_r, &req, sizeof(req));
- if(err != sizeof(req)){
- if(err < 0)
- printk("not_aio_thread - read failed, "
- "fd = %d, err = %d\n", aio_req_fd_r,
- -err);
+ while (1) {
+ err = read(aio_req_fd_r, &req, sizeof(req));
+ if (err != sizeof(req)) {
+ if (err < 0)
+ printk(UM_KERN_ERR "not_aio_thread - "
+ "read failed, fd = %d, err = %d\n",
+ aio_req_fd_r,
+ errno);
else {
- printk("not_aio_thread - short read, fd = %d, "
- "length = %d\n", aio_req_fd_r, err);
+ printk(UM_KERN_ERR "not_aio_thread - short "
+ "read, fd = %d, length = %d\n",
+ aio_req_fd_r, err);
}
continue;
}
err = do_not_aio(&req);
reply = ((struct aio_thread_reply) { .data = req.aio,
- .err = err });
- err = os_write_file(req.aio->reply_fd, &reply, sizeof(reply));
- if(err != sizeof(reply))
- printk("not_aio_thread - write failed, fd = %d, "
- "err = %d\n", aio_req_fd_r, -err);
+ .err = err });
+ err = write(req.aio->reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply))
+ printk(UM_KERN_ERR "not_aio_thread - write failed, "
+ "fd = %d, err = %d\n", req.aio->reply_fd, errno);
}
return 0;
}
-static int aio_pid = -1;
-
static int init_aio_24(void)
{
- unsigned long stack;
int fds[2], err;
err = os_pipe(fds, 1, 1);
- if(err)
+ if (err)
goto out;
aio_req_fd_w = fds[0];
aio_req_fd_r = fds[1];
+
+ err = os_set_fd_block(aio_req_fd_w, 0);
+ if (err)
+ goto out_close_pipe;
+
err = run_helper_thread(not_aio_thread, NULL,
- CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
- if(err < 0)
+ CLONE_FILES | CLONE_VM, &aio_stack);
+ if (err < 0)
goto out_close_pipe;
aio_pid = err;
goto out;
out_close_pipe:
- os_close_file(fds[0]);
- os_close_file(fds[1]);
+ close(fds[0]);
+ close(fds[1]);
aio_req_fd_w = -1;
aio_req_fd_r = -1;
out:
#ifndef HAVE_AIO_ABI
- printk("/usr/include/linux/aio_abi.h not present during build\n");
+ printk(UM_KERN_INFO "/usr/include/linux/aio_abi.h not present during "
+ "build\n");
#endif
- printk("2.6 host AIO support not used - falling back to I/O "
- "thread\n");
+ printk(UM_KERN_INFO "2.6 host AIO support not used - falling back to "
+ "I/O thread\n");
return 0;
}
#define DEFAULT_24_AIO 0
static int init_aio_26(void)
{
- unsigned long stack;
int err;
- if(io_setup(256, &ctx)){
+ if (io_setup(256, &ctx)) {
err = -errno;
- printk("aio_thread failed to initialize context, err = %d\n",
- errno);
+ printk(UM_KERN_ERR "aio_thread failed to initialize context, "
+ "err = %d\n", errno);
return err;
}
err = run_helper_thread(aio_thread, NULL,
- CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
- if(err < 0)
+ CLONE_FILES | CLONE_VM, &aio_stack);
+ if (err < 0)
return err;
aio_pid = err;
- printk("Using 2.6 host AIO\n");
+ printk(UM_KERN_INFO "Using 2.6 host AIO\n");
return 0;
}
int err;
err = do_aio(ctx, type, io_fd, buf, len, offset, aio);
- if(err){
+ if (err) {
reply = ((struct aio_thread_reply) { .data = aio,
.err = err });
- err = os_write_file(aio->reply_fd, &reply, sizeof(reply));
- if(err != sizeof(reply))
- printk("submit_aio_26 - write failed, "
+ err = write(aio->reply_fd, &reply, sizeof(reply));
+ if (err != sizeof(reply)) {
+ err = -errno;
+ printk(UM_KERN_ERR "submit_aio_26 - write failed, "
"fd = %d, err = %d\n", aio->reply_fd, -err);
+ }
else err = 0;
}
}
#endif
+/* Initialized in an initcall and unchanged thereafter */
static int aio_24 = DEFAULT_24_AIO;
static int __init set_aio_24(char *name, int *add)
{
int err;
- CHOOSE_MODE(({ if(!aio_24){
- printk("Disabling 2.6 AIO in tt mode\n");
- aio_24 = 1;
- } }), (void) 0);
-
- if(!aio_24){
+ if (!aio_24) {
err = init_aio_26();
- if(err && (errno == ENOSYS)){
- printk("2.6 AIO not supported on the host - "
- "reverting to 2.4 AIO\n");
+ if (err && (errno == ENOSYS)) {
+ printk(UM_KERN_INFO "2.6 AIO not supported on the "
+ "host - reverting to 2.4 AIO\n");
aio_24 = 1;
}
else return err;
}
- if(aio_24)
+ if (aio_24)
return init_aio_24();
return 0;
}
-/* The reason for the __initcall/__uml_exitcall asymmetry is that init_aio
+/*
+ * The reason for the __initcall/__uml_exitcall asymmetry is that init_aio
* needs to be called when the kernel is running because it calls run_helper,
* which needs get_free_page. exit_aio is a __uml_exitcall because the generic
* kernel does not run __exitcalls on shutdown, and can't because many of them
static void exit_aio(void)
{
- if(aio_pid != -1)
+ if (aio_pid != -1) {
os_kill_process(aio_pid, 1);
+ free_stack(aio_stack, 0);
+ }
}
__uml_exitcall(exit_aio);
};
int err;
- err = os_write_file(aio_req_fd_w, &req, sizeof(req));
- if(err == sizeof(req))
+ err = write(aio_req_fd_w, &req, sizeof(req));
+ if (err == sizeof(req))
err = 0;
+ else err = -errno;
return err;
}
struct aio_context *aio)
{
aio->reply_fd = reply_fd;
- if(aio_24)
+ if (aio_24)
return submit_aio_24(type, io_fd, buf, len, offset, aio);
- else {
+ else
return submit_aio_26(type, io_fd, buf, len, offset, aio);
- }
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff