libnvmf_registry_update-libnvme3(2)

NAME

libnvmf_registry_update - Update an attribute in a controller's registry entry

SYNOPSIS

int libnvmf_registry_update (struct libnvme_global_ctx *ctx , const char *device , const char *attr , const char *value );

ARGUMENTS

ctx

libnvme global context; must not be NULL

device

Kernel device name (e.g. "nvme3")

attr

Attribute name to update (e.g. "owner")

value

New attribute value, or NULL to remove the attribute file

DESCRIPTION

Writes the attribute value to the controller's registry entry using an atomic tmp-file rename. If the entry does not exist, it is created atomically the same way as on connect, including the best-effort seqnum stamp for the udev cleanup rule. If value is NULL, the attribute file is removed instead; a missing entry is left alone in this case.

RETURN

0 on success, negative errno from underlying system calls otherwise.