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gfs_fork_size - get the size of a fork
#include <gfs.h>
int gfs_fork_size(int fork_id);
gfs_fork_size returns to the application the size of the
fork associated with the open fork, fork_id .
gfs_fork_size returns the size of the fork on success, or -1
if an error occurred.
GFS_EBADF
fork_id isn't a valid fork id.
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