mirror of
https://github.com/ceph/go-ceph
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a9ce294dbb
Some versions of librbd provide the rbd_clone4 function, and others do not. Squid will have the function backported in the 1st update, the initial release of Squid does not have it. This makes checking for the function based on the named Ceph version impractical. With the new dlsym.LookupSymbol() function, it is now possible to check the availability of rbd_clone4 during runtime. If the symbol is not found ErrNotImplemented is returned, which can be used to detect the unavailability of the function. Signed-off-by: Niels de Vos <ndevos@ibm.com>
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package rbd
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/*
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#include <errno.h>
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*/
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import "C"
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import (
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"errors"
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"github.com/ceph/go-ceph/internal/errutil"
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)
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// rbdError represents an error condition returned from the librbd APIs.
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type rbdError int
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func (e rbdError) Error() string {
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return errutil.FormatErrorCode("rbd", int(e))
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}
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func (e rbdError) ErrorCode() int {
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return int(e)
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}
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func getError(err C.int) error {
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if err != 0 {
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if err == -C.ENOENT {
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return ErrNotFound
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}
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return rbdError(err)
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}
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return nil
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}
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// getErrorIfNegative converts a ceph return code to error if negative.
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// This is useful for functions that return a usable positive value on
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// success but a negative error number on error.
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func getErrorIfNegative(ret C.int) error {
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if ret >= 0 {
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return nil
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}
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return getError(ret)
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}
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// Public go errors:
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var (
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// ErrNoIOContext may be returned if an api call requires an IOContext and
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// it is not provided.
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ErrNoIOContext = errors.New("IOContext is missing")
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// ErrNoName may be returned if an api call requires a name and it is
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// not provided.
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ErrNoName = errors.New("RBD image does not have a name")
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// ErrSnapshotNoName may be returned if an api call requires a snapshot
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// name and it is not provided.
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ErrSnapshotNoName = errors.New("RBD snapshot does not have a name")
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// ErrImageNotOpen may be returned if an api call requires an open image handle and one is not provided.
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ErrImageNotOpen = errors.New("RBD image not open")
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// ErrImageIsOpen may be returned if an api call requires a closed image handle and one is not provided.
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ErrImageIsOpen = errors.New("RBD image is open")
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// ErrNotFound may be returned from an api call when the requested item is
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// missing.
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ErrNotFound = errors.New("RBD image not found")
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// ErrNoNamespaceName maye be returned if an api call requires a namespace
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// name and it is not provided.
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ErrNoNamespaceName = errors.New("Namespace value is missing")
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// revive:disable:exported for compatibility with old versions
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RbdErrorImageNotOpen = ErrImageNotOpen
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RbdErrorNotFound = ErrNotFound
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// revive:enable:exported
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)
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// Public general error
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const (
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// ErrNotExist indicates a non-specific missing resource.
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ErrNotExist = rbdError(-C.ENOENT)
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// ErrNotImplemented indicates a function is not implemented in by librbd.
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ErrNotImplemented = rbdError(-C.ENOSYS)
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)
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// Private errors:
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const (
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errRange = rbdError(-C.ERANGE)
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)
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