On 04/28/2011 09:51 AM, Sassan Panahinejad wrote:
This thread seems relevant: http://www.mail-archive.com/address@hidden/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 <address@hidden>
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;
}
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