On 07/25/2012 03:22 PM, Eric Blake wrote:
On 07/23/2012 07:08 AM, Corey Bryant wrote:
This patch converts all block layer open calls to qemu_open.
Note that this adds the O_CLOEXEC flag to the changed open paths
when the O_CLOEXEC macro is defined.
Is it actually adding O_CLOEXEC, or just the ability to use O_CLOEXEC?
It is adding O_CLOEXEC in qemu_open() on the open() call (as long as it
is defined).
Or is the actual change that the end result is that the fd now has
FD_CLOEXEC set unconditionally, whether by O_CLOEXEC (which the caller
need not pass) or by fcntl()?
The statement in the commit message isn't referring to anything dealing
with qemu_dup(). The statement is specifically talking about the open()
call in qemu_open(), and the point is to alert folks that old open()
calls are now being routed through qemu_open() and likely are using the
O_CLOEXEC flag, which is new behavior.
+++ b/block/raw-posix.c
@@ -572,8 +572,8 @@ static int raw_create(const char *filename,
QEMUOptionParameter *options)
options++;
}
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
- 0644);
+ fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+ 0644);
After all, I don't see O_CLOEXEC used here.
That's right. qemu_open() adds O_CLOEXEC on the open() call.
if (fd < 0) {
result = -errno;
} else {
@@ -846,7 +846,7 @@ static int hdev_open(BlockDriverState *bs, const char
*filename, int flags)
if ( bsdPath[ 0 ] != '\0' ) {
strcat(bsdPath,"s0");
/* some CDs don't have a partition 0 */
- fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
+ fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
Also, I still stand by my earlier claim that we don't need O_LARGEFILE
here (we should already be configuring for 64-bit off_t by default),
although cleaning that up is probably worth an independent commit.
I have a note to get rid of O_LARGEFILE as a separate follow-on patch.
+++ b/block/vdi.c
@@ -653,8 +653,9 @@ static int vdi_create(const char *filename,
QEMUOptionParameter *options)
options++;
}
- fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
- 0644);
+ fd = qemu_open(filename,
+ O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
+ 0644);
Another pointless O_LARGEFILE, and so forth.
Yep.
--
Regards,
Corey
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