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Description of problem:
Coverity reports:
CHECKED_RETURN (block/gluster.c:335)
Calling "fcntl(s->fds[0], 4, 2048)" without checking return value. This library function may fail and return an error code.
Error occurs in function qemu_gluster_open.
Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.474.el6
Additional info:
Appears to be legitimate defect. Present in rhel7 too, but has been around for years.
>IIRC without having the code in front of me this is a F_SETFL.
It is.
>We know that nothing can fail here.
fcntl is documented as returning specific error conditions when a given operation is attempted; the F_SETFL command is not specifically mentioned, so these error conditions cannot occur. However, several generic error conditions are documented--without mentioning a command--so it is reasonable to assume they could occur:
EACCES or EAGAIN
Operation is prohibited by locks held by other processes.
EAGAIN
The operation is prohibited because the file has been memory-mapped by another process.
EBADF
fd is not an open file descriptor
ENOLCK
Too many segment locks open, lock table is full, or a remote locking protocol failed (e.g., locking over NFS).
EPERM
Attempted to clear the O_APPEND flag on a file that has the append-only attribute set.
Out of all these, I'd be most concerned about ENOLCK (given that this is in a glusterfs function). Are you sure that nothing can fail here?