Use the CephStatx type previously added to the library to implement a
wrapper for the ceph_fstatx function.
Signed-off-by: John Mulligan <jmulligan@redhat.com>
Negative offsets that are passed through ReadAt/WriteAt to the ceph
calls cause them to behave like Read/Write and this is undesirable
at the go layer. Additionally, the os packages' file functions
reject negative offsets as well.
Signed-off-by: John Mulligan <jmulligan@redhat.com>
Have Read and ReadAt functions return io.EOF when nothing is read
from the file so that it matches the current behavior of file types
in Go standard library.
Signed-off-by: John Mulligan <jmulligan@redhat.com>
Now, the close function is idempotent wrt being called multiple times
on a valid file. Additionally, check the state of the file in various
functions to produce sensible errors, matching those cephfs itself
returns, if the object was not constructed properly.
Signed-off-by: John Mulligan <jmulligan@redhat.com>
