> You can only fsync given a file descriptor, but I think writing an
fsync binary that opens the file read-only, fsync on the descriptor, and
close the file, should work.
Use this little program to verify your assumptions (I have no time right
now):
#include <fcntl.h> /* open(), O_RDONLY */
#include <unistd.h> /* fsync() */
#include <errno.h> /* errno */
#include <string.h> /* strerror() */
#include <stdio.h> /* fprintf(), stderr */
int
main(int argc, char **argv)
{
char *file_name; /* Name of the file to sync */
int fd; /* File descriptor */
int exit_code=0;
int i;
/* For each argument, except program itself */
for(i=1; i<argc; i++)
{
file_name=argv[i];
/* Open file in readonly mode, unbuffered mode */
fd=open(argv[i], O_RDONLY);
/* Ignore errors */
if(fd==-1)
{
fprintf(stderr,"Cannot open file \"%s\": %s\n",file_name,
strerror(errno));
/* Ignore errors */
exit_code=1; /* Return non-zero exit code to indicate problem. */
continue;
}
if(fsync(fd)==-1)
{
fprintf(stderr,"Cannot open file \"%s\": %s\n",file_name,
strerror(errno));
/* Ignore errors */
exit_code=1; /* Return non-zero exit code to indicate problem. */
continue;
}
}
return exit_code;
}
--
Ext4 data loss
https://bugs.launchpad.net/bugs/317781
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