Ensure that given xattr satisfies comparison.
If the comparison is not satisfied, the return code of the
operation will be -ECANCELED
@param write_op operation to add this action to
@param name name of the xattr to look up
@param comparison_operator currently undocumented, look for
LIBRADOS_CMPXATTR_OP_EQ in librados.h
@param value buffer to compare actual xattr value to
@param value_len length of buffer to compare actual xattr value to
Ensure that given xattr satisfies comparison. If the comparison is not satisfied, the return code of the operation will be -ECANCELED @param write_op operation to add this action to @param name name of the xattr to look up @param comparison_operator currently undocumented, look for LIBRADOS_CMPXATTR_OP_EQ in librados.h @param value buffer to compare actual xattr value to @param value_len length of buffer to compare actual xattr value to