On 04/28/2011 09:51 AM, Sassan Panahinejad wrote:
This thread seems relevant:
http://www.mail-archive.com/linux-fsdevel@vger.kernel.org/msg09159.html
Unless things have changed, it looks like the problem is in the client
kernel (although note that there isn't support in qemu, even if the
client did send an fid associated with an open file!).
Any thoughts on a workaround for this?
Hrm, I don't see any workaround for this. May be we should add TFSTAT
for dotl? or add a flag to
TSTAT?
Copying the v9fs.
Thanks,
JV
Thanks
Sassan
On 28 April 2011 17:13, Sassan Panahinejad <sas...@sassan.me.uk
<mailto:sas...@sassan.me.uk>> wrote:
It should be possible for guest applications to fstat a file for
which they have a valid file descriptor, even if the file has been
removed.
Demonstrated by the code sample below (fstat reports no such file
or directory).
Strangely it seems that reading from a file in this state works
fine (and when both are run, the server receives a different fid
for each).
On any other filesystem, the code runs correctly. On our 9p
filesystem it fails.
Many applications (including bash) depend on this working correctly.
I will continue investigating, but any thoughts anyone has on the
subject would be appreciated.
Thanks
Sassan
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
int main(void)
{
int ret;
struct stat statbuf;
int fd = open("test.txt", O_RDWR | O_CREAT, 0666);
if (fd < 0) {
printf("open failed: %m\n");
return 1;
}
ret = write(fd, "test1\n", 6);
if (ret < 0) {
printf("write1 failed: %m\n");
return 1;
}
ret = unlink("test.txt");
if (ret < 0) {
printf("unlink failed: %m\n");
return 1;
}
ret = fstat(fd, &statbuf);
if (ret < 0) {
printf("fstat failed: %m\n");
return 1;
}
return 0;
}
