Hi! On 11:00 Tue 29 Jun , Sudheer wrote: > One basic doubt regarding block layer & write system call. When a > process writes to a file in blocking mode, when the 'write' system > call returns, > > A. will the process be returned only after actually writing the data > on to the target block device? In this case we will get the benefit of > elevator only if multiple processes are writing to the adjacent > locations in the device. Is this true? Usually not, but you might get this behaviour by specifying the mount option "sync" on some file systems. > > > OR > > B. will the process be returned after scheduling the writing (say > after passing the data to the elevator)? Yes, this is what usually happens. > If this case is true, how > would the process ensure that the data has been actually written on to > the block device? By calling fsync() . -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
